Compact substation

Abstract

The invention relates to a transformer house (10) comprising: - a house (5) having walls (7) which define a plurality of compartments (6, 11, 12, 14, 16, 18), - a transformer (20) positioned within the house, - a middle voltage cable entry compartment (6) via which middle voltage cables (26) enter the transformer house, - a middle voltage switchgear cabinet (28) configured for controlling and switching the middle voltage current entering the transformer house via the middle-voltage cables, - a middle voltage switchgear cabinet compartment (11) which accommodates the middle voltage switchgear cabinet, wherein the middle voltage cable entry compartment (6) is separated from the middle voltage switchgear cabinet compartment (11) by at least a first wall (41).

Description

[0001] P37196PC00 / WHA

[0002] Title: Transformer house

[0003] FIELD OF THE INVENTION

[0004] The present invention relates to an improved transformer house.

[0005] BACKGROUND OF THE INVENTION

[0006] Electricity pays an increasingly important role in the energy supply of modern economies. This development is related to the desire to reduce carbon emissions. In the coming years, the electricity network in many countries needs to be expanded considerably. A large number of transformer houses will need to be installed.

[0007] Currently used transformer houses have a number of drawbacks. One drawback is that they are sensitive to water leakage at the entry point of the cables. The entry point is below ground level and groundwater may enter the transformer house in case of leakage. This groundwater may then come into contact with middle voltage (also indicated as MV) cable connectors and low voltage (also indicated as LV) cable connectors and increase the humidity in the transformer house. This can potentially cause short circuiting and malfunctioning (due to corrosion). This may result in a significant safety risk and in a reduction in life span of the transformer house as a whole or certain components within the transformer house. Also, the continuity in service to customers of energy grid operators may suffer.

[0008] An associated drawback of current transformer houses is their relatively short life expectancy. Due to water leakage sensitivity, current transformer houses make use of seals and / or gaskets at potential water entry points in order to reduce water entry into the transformer house. These seals and gaskets are susceptible to wear. A worn seal may result in water leakage and relatively early damage to the transformer house.

[0009] Currently used transformer houses are also sensitive to local flooding. A temporary flooding of the area in which a transformer house is located may result in significant damage. This is due to the fact that an overflow level at which the transformer house becomes flooded is relatively low.

[0010] Another problem of current transformer houses is that it is difficult to install the cables. The cables are relatively stiff and need to be inserted into the transformer house and need to be bent to be connected to the connector. This requires considerable force and requires 3 to 5human operators to get the job done. This is undesirable from an economic and ergonomic point of view.

[0011] Another problem of current transformer houses is that they are relatively bulky, in the sense that they have a high volume above ground. Current transformer houses may pose a visual obstacle in a neighbourhood.

[0012] US5111000A (D1) discloses a transformer house designed to minimize an above ground portion, to provide ground water protection and to facilitate installation of cable via a relatively large bending radius. However, it was found that in D1 the installation of cable is still relatively difficult. It was also found that the transformer house of D1 is still vulnerable to a rising water level. Also, the electrical components in D1 are not easily accessible for an operator.

[0013] DE29804513U1 (D2) discloses another transformer house which is also vulnerable to a rising water level. Also, the bending of the cables is difficult.

[0014] EP0878808B1 discloses another transformer house. In this transformer house, the MV cables are connected directly to the MV switchgear cabinet, see fig. 27. The MV cables enter the transformer house via one or more narrow openings in an inclined section of the concrete house, see element 37 in fig. 27. These openings are below ground level and are located in the wall which surrounds the space where the transformer is. There is a risk of leakage, which may lead to flooding of this inner space and the transformer in it. The transformer may become damaged by corrosion and short circuiting may occur. Further, it is impossible or difficult for a human operator of normal size to enter this area of the transformer house and handle the MV cable, which is quite stiff. It was recognized in the present invention that these features make the installation of the MV cable difficult.

[0015] It was further recognized that for this transformer house, it is difficult to exchange the transformer when it needs replacement. The MV switchgear cabinet is positioned above the transformer and there is really no way out for the transformer, except by disassembling a significant portion of the transformer house. This is a major problem because in practice, transformers need to be exchanged from time to time. If an electricity company has in the order of ten thousand transformer houses, a plurality of transformers will need to be exchanged each week.

[0016] Also, this transformer house has difficulty in dissipating heat from the transformer because the area around transformer is not ventilated well. All in all, this appears to be a failed design.To the best of the knowledge of the inventor / applicant / patent owner, this design has never been implemented in real life.

[0017] CN10463855A discloses a transformer house which is placed entirely above ground. This is clear from the doors with handles 16 which need to be opened. If these doors are below ground level, they cannot be opened. Also, this transformer house has two levels above one another. As a result, the transformer house is high above ground and forms a bulky and ugly obstacle, which is undesirable in residential areas.

[0018] and WO2023281363 disclose transformer houses which are similar to EP0878808B1 in the sense that the MV cables connect directly to the MV switch gear cabinet and that the MV cables extend through narrow openings in the floor of the transformer house. The installation of the MV cables is therefore quite difficult.

[0019] OBJECT OF THE INVENTION

[0020] It is an object of the present invention to provide a transformer house which is better guarded against leakage from groundwater and is better protected against flooding.

[0021] It is another object of the present invention to provide a transformer house which has a higher life expectancy.

[0022] It is another object of the present invention to provide a transformer house which has better ergonomics, i.e. which is easier to install in the sense that coupling the cables to the transformer house is easier and can be done in less time than in known transformer houses.

[0023] It is another object of the present invention to provide a transformer house with a smaller visible portion of the transformer house to increase acceptance by the public.

[0024] It is another object of the invention to provide a transformer house for which an installation depth can be varied in dependence of an expected water level / floodrisk and a desired maximum height (visible portion) above ground.

[0025] It is another object of the invention to provide more flexibility in ground cable directions and implement the use of empty conduits (ducts) to facilitate delayed or planned capacity increase in the nearby future. This can significantly reduce the surface area that needs to be reserved & disturbed for the installation of cable routes around the transformer house. Furthermore,empty conduits installed during initial construction can prevent the need to break up the soil for new or delayed cable routes.

[0026] SUMMARY OF THE INVENTION

[0027] At least one of the objects of the invention is achieved by a transformer house comprising:

[0028] - a house having walls which define a plurality of compartments,

[0029] - a transformer positioned within the house,

[0030] - a middle voltage cable entry compartment via which middle voltage cables enter the transformer house,

[0031] - a middle voltage switchgear cabinet configured for controlling and switching the middle voltage current entering the transformer house via the middle-voltage cables,

[0032] - a middle voltage switchgear cabinet compartment which accommodates the middle voltage switchgear cabinet,

[0033] - wherein the middle voltage cable entry compartment is separated from the middle voltage switchgear cabinet compartment by at least a first wall.

[0034] By separating the middle voltage switchgear cable entry compartment from the middle voltage switchgear cabinet compartment, the middle voltage cables may be connected to the middle voltage switchgear cabinet higher up in the transformer house. As a result, the connection between the middle voltage cables and the transformer house remains safe at a relatively higher water level and condensation issues are reduced due to its higher ground level distance.

[0035] The middle voltage switchgear cabinet may be a Ring Main Unit (RMU). RMUs are widely used in ring-type electrical power distribution networks. Middle voltage cables are connected to the transformer via the RMU.

[0036] The house comprises walls and a floor which may be made from concrete, in particular prefab concrete. The concrete may be reinforced. The transformer house is at least partially below ground (semi-buried).In some embodiment, the transformer house is located at least partially below ground level, and wherein the transformer and RMU are located at least partially below ground level, wherein the transformer house comprises:

[0037] - at least two closed compartments which accommodate water-susceptible equipment below ground level, and wherein said closed compartment does not have openings below ground level towards the outside in the walls and floor of that compartment,

[0038] - at least one open compartment which has at least one wall or a floor having one or more openings below ground level towards the outside, and wherein said at least one open compartment does not accommodate water-susceptible equipment.

[0039] Advantageously, the compartment(s) which accommodate water-susceptible equipment are watertight and not at risk of leaking, and the compartments which may become wet due to entering groundwater do not have equipment which may become damaged as a result of the entering groundwater. This is a robust embodiment. In the context of this paragraph, the MV and LV connectors are not considered equipment.

[0040] In some embodiments, the transformer house comprises a roof, wherein the roof is located at a height of 1.2-1.9 metres above ground level, in particular at a height of between and including 1.3-1.8 metres above ground level. The roof height is variable and may depend on the water level, an expected flood water level, aesthetic considerations favouring a smaller visible portion of the transformer house, or a combination of these factors.

[0041] An operator area is located in front of the middle voltage switchgear cabinet.

[0042] In some embodiments, the MV cables are not connected directly to the MV switchgear cabinet but are connected indirectly. It is normal practice for a skilled person in this field to use as few transitions and intermediate parts as possible and the make the current conducting parts as direct and straight as possible. Therefore, in transformer houses of the prior art, the MV cables are connected to the MV switchgear cabinet directly. Because the position and orientation of the MV switch gear cabinet is subject to various other design considerations such accessibility for an operator, the position relative to the transformer and other considerations, the path of the relatively stiff MV cables in the transformer house often results in installation difficulties and risk of water ingress. In the present invention it was recognized that it brings an advantage to go against the standard and otherwise good practice of few transitions and direct connections. By making the connection indirect and adding some transitions, the MV cables can enter the transformer house in a way which is toa certain degree independent from the position and orientation of the MV switchgear cabinet. The MV cables can in particular enter the transformer house in a way which takes into account the stiffness of the MV cables and the difficulty in handling these stiff cables. The indirect connection allows easier installation of the stiff MV cables, while maintaining a position for the MV switchgear cabinet which is suitable with regard to other design criteria.

[0043] In some embodiments, the transformer house comprises a number of middle-voltage connectors, wherein each middle voltage connector comprises:

[0044] - a first connector end configured to allow an end of a middle voltage cable to be connected to it, and

[0045] - a second connector end configured to connect to the middle voltage switchgear cabinet,

[0046] wherein the first connector end and the second connector end are located in separate compartments and are in particular located on opposite sides of the first wall.

[0047] Advantageously, the first connectors can be located at a distance from the MV switchgear cabinet, allowing a certain degree of independence of the position and orientation of the MV switchgear cabinet from the ends of the MV cables and from the trajectory of the MV cables through the transformer house.

[0048] In some embodiments, the transformer house comprises middle voltage bridge parts, which connect the second connector ends with the middle voltage switchgear cabinet. The middle voltage bridge parts span a distance and allow the first connector ends to be located at a distance from the MV switch gear cabinet.

[0049] The middle voltage connectors allow for connecting the middle voltage cables to the middle voltage switchgear cabinet without having to move the middle voltage cables past or through the first wall. This embodiment of the indirect connection results in less risk of water ingress and associated problems.

[0050] In some embodiments, an end of each middle voltage cable is connected to an associated middle-voltage connector via a busbar coupling, wherein the busbar coupling in particular has a T-shape or an L-shape, wherein each middle-voltage connector has a substantially horizontal orientation and wherein an end of each middle voltage cable is oriented substantially vertically, and wherein each busbar coupling connects the substantially vertically oriented cable end to the substantially horizontal middle-voltage connector. The busbar couplings allow for connecting a middle voltage cable with a substantial vertical orientation horizontally without the need for bending of the middle voltage cable.In some embodiments, the middle voltage cable entry compartment and the middle voltage switchgear cabinet compartment are accessible via different and in particular opposite sides of the house. In this way, the required force during installation is reduced, in particular when multiple cables need to be installed, resulting in repetitive loads. Fewer workmen are required and the workmen can have a better working posture. This makes installation of the middle voltage cables easier for an operator and results in a cost reduction and an improvement of the ergonomics.

[0051] In some embodiments, the middle voltage cable entry compartment does not have a floor over a significant portion of its surface area, but rather has a bottom opening at a bottom end, such that the middle voltage cables can enter the middle voltage cable entry compartment without having to extend through a narrow opening in a floor or wall of the house. A bottom end which is open allows for easier entry of the middle voltage cables into the middle voltage cable entry compartment compared to narrow openings in a floor or wall of the house. Multiple MV cables and (empty) conduits share the same bottom opening.

[0052] In some embodiments, the middle-voltage connectors are located above an inflow height (H3) of the transformer house. The inflow height H3 is the water level above ground level at which water enters the transformer house, in particular via one of the thresholds. The relatively high location of the middle-voltage connectors ensures that the middle-voltage connectors are not a cause of short-circuiting when the water level rises. By positioning the middle-voltage connectors above the inflow height, better safety against flooding is achieved and - due to the fact this compartment is not fully closed, a relative high position aids reduction of moist and condensation.

[0053] In some embodiments, the middle voltage cable entry compartment is not watertight at a lower end thereof and in particular has a first bottom opening instead of a bottom floor over at least a significant portion of its surface area. Due to the separation of the middle voltage cable entry compartment and the middle voltage switchgear cabinet compartment and due to the relatively high location of the middle-voltage connectors, the middle voltage cable entry compartment does not need to be watertight. The connections and materials applied in this entry compartment are watertight and / or long-term humidity proof.

[0054] In some embodiments, a height H5 of the lowest inflow threshold above the floor of the transformer house is at least 40, more in particular at least 50 percent of the total height H2 of the transformer house. This allows a relatively deep positioning of the transformer house into the ground, with a low height H4 above ground, without risk of flooding.In some embodiments, the house has an MV opening in an outer wall at the middle voltage cable entry compartment, wherein said MV opening provides access for an operator to the middle voltage connectors. By providing access to the middle voltage cable entry compartment through a MV opening, installation of the middle voltage cables to the middle voltage connectors is easier.

[0055] In some embodiments, the MV opening extends all the way down in the sense that the MV opening does not have a threshold or has a removable threshold, such that the MV opening is connected to the first bottom opening, forming a MV common lower opening. The MV common lower opening is combined in the sense that it comprises the first bottom opening and a lower portion of the MV opening, the upper portion being covered. It is common in the sense that multiple MV cables and (empty) conduits extend through a single opening.

[0056] The MV common lower opening may have a surface area of at least four times the surface area of a cross-section of an MV cable, more in particular at least twelve times the surface area of a cross-section of an MV cable. It was found that a relatively large MV common lower opening for the MV cables allows easier handling and installation of the stiff MV cables. The MV common lower opening is not sealed around the MV cables and therefore, entry of ground water is possible. This is not a problem, because the MV cable entry compartment does not have any water-susceptible equipment below the ground level. The ends of the MV cables and the busbar couplings are positioned at a safe distance above the ground level.

[0057] By combining the first bottom opening and the MV opening into a combined MV common lower opening, installation of the middle voltage cables to the middle voltage cable connectors is simplified even more. If the covering of the MV opening extends all the way to the bottom end, the MV common lower opening is reduced in size to the first bottom opening and becomes the same as the first bottom opening. If the covering of the MV opening does not extend all the way to the bottom end, the MV common lower opening is larger than the first bottom opening and the MV cables may enter the MV cable compartment via the part of the MV common lower opening which is the lower part of the MV opening or via the part of the MV common lower opening which is the first bottom opening. This depends somewhat on the curvature of the MV cables, which may vary.

[0058] In some embodiments, the transformer house comprises a first hatch configured to removably cover at least a part, in particular an upper part, of the MV opening. The wordhatch is intended to have a broad meaning in this document, also covering a door or a removable panel.

[0059] The first hatch ensures that the MV opening remains easily accessible to an operator while preventing access to others, improving safety and helping in preventing theft or damage to the inside of the transformer house.

[0060] In some embodiments, the middle-voltage connectors are located at an upper part of the transformer house and are in particular located at a first connector height (H1) above a floor of the transformer house, wherein the first connector height (H1) is more than 75 percent of a total height (H2) of the house. By positioning the middle voltage connectors high up in the transformer house, the connectors are less susceptible to higher water levels. It also allows for burying the transformer house at a greater depth, which reduces the height H4 above ground level and reduces a visible portion of the transformer house above-ground.

[0061] In some embodiments, when seen in side view the middle voltage bridge parts extend downward from the middle voltage connector devices and curve upward and enter the middle voltage switch gear cabinet from a lower side. The middle voltage bridge parts may comprising cables with a busbar coupling on both ends. The use of bridge parts prevents the need to feed middle voltage cables through a greater portion of the transformer house, simplifying installation of the middle voltage cables in the transformer house.

[0062] In some embodiments, when seen in side view, the middle voltage bridge parts have a U-shape with legs of uneven length, wherein, when seen in side view, the leg of the U-shape of each middle voltage bridge part which connects to the associated middle voltage connector device is longer than the leg of the U-shape which connects to the middle voltage switchgear cabinet.

[0063] The cable connection points of a middle voltage switchgear cabinet may be positioned below the middle voltage connectors. In order to achieve connection between the middle voltage switchgear cabinet and the middle voltage connectors, and with that a connection to middle voltage cables connected to the middle voltage connectors, the middle voltage bridge parts require connection points at different heights.

[0064] In some embodiments, when seen in top view the transformer house has a rectangular shape, wherein the transformer is located in a right portion and the middle voltage connectors with the middle voltage switch gear cabinet are located in a left portion. Thedivision of the transformer house into a right and a left portion, with the middle voltage connectors and the middle voltage switchgear cabinet located in a left portion, creates an intuitive layout of the transformer house for an operator with at least the majority of middle voltage components located in one portion.

[0065] In some embodiments, the middle voltage switch gear compartment and the transformer compartment form a combined compartment.

[0066] In some embodiments, each middle voltage connector is pivotable about a substantially horizontal pivot axis between a use position and an access position in which an operator can access the associated bridge part. A pivotable middle voltage connector allows for easier access to the side of the middle voltage connector facing the inside of the transformer house. The pivotable middle voltage connector can be secured both in the use and in the access position.

[0067] In some embodiments, the transformer house comprises at least two middle voltage connector groups, in particular three middle voltage connector groups, wherein each middle voltage connector group comprises at least three middle voltage connectors. Transformer houses typically require multiple middle voltage connectors for handling three phase power. With multiple groups, RMU layout flexibility and redundancy is built into the transformer house. The middle voltage connectors may be pivotable as a group of three middle voltage connectors.

[0068] In some embodiments, the middle voltage switchgear cabinet compartment is configured to be accessed by an operator above-ground. By configuring the transformer house to be accessed above-ground by an operator, installation and / or maintenance is easier.

[0069] Low voltage (LV)

[0070] In some embodiments, the transformer house comprises:

[0071] - a low voltage (LV) cable entry compartment via which the low voltage cables enter the transformer house,

[0072] - a low voltage switchgear cabinet configured for controlling and switching the low voltage current leaving or entering the transformer house via the low voltage cables, anda low voltage switchgear cabinet compartment which accommodates the low voltage switchgear cabinet.

[0073] In order for low voltage power to be able to leave and / or enter the transformer house in a controlled manner, a low voltage cable entry compartment and a low voltage switchgear cabinet are provided.

[0074] In some embodiments, the LV cable entry compartment and the MV cable entry compartment are located on a same side of the transformer house, called the cable entry side. By having the middle voltage cable entry compartment and the low voltage cable entry compartment located on a same side of the transformer house, installation of the middle voltage cables and the low voltage cables is easier as the ground at only that side of the transformer house may need to be dug away.

[0075] In some embodiments, the LV cable entry compartment and the low voltage switchgear cabinet compartment are accessible from opposite sides of the transformer house. Having the low voltage switchgear cabinet compartment and the LV cable entry compartment accessible from opposite sides of the transformer house makes it easier to run the LV cables from one compartment to the other without having to make sharp bends in the LV cables. This advantage also applies to the MV cables.

[0076] In some embodiments, when seen in side view the low voltage cables enter the transformer house via a lower portion of the LV cable entry compartment, extend upwards, wherein the PS cables are split off from the LV cables in the LV cable entry compartment, wherein the three remaining LV phase cables make a curve, and extend over the transformer to the low voltage switchgear cabinet and connect to an upper side of the low voltage switchgear cabinet. By having the three phase cables of the LV cables extend over the transformer, the ergonomics of installation is improved. The LV cables can be easily installed in position due to the open LV cable entry compartment, wherein the electricians can have a good posture and do not need to bend down a lot, as is required in transformer houses of the prior art.

[0077] The earthing cable and cable shield are directly connected to the earthing strip in the cable entry compartment.

[0078] In some embodiments, the low voltage switch gear cabinet compartment is separated by a second inner wall from the transformer compartment.A second inner wall provides protection to the low voltage switchgear cabinet compartment in case the transformer overloads or otherwise malfunctions and causes an explosion or fire. This is beneficial when an operator is accessing the low voltage switchgear cabinet at the moment of an explosion or fire caused by the transformer.

[0079] In some embodiments, the house has an LV opening in its outer wall at the low voltage cable compartment, and wherein said LV opening extends all the way down in the sense that the LV opening does not have a threshold, wherein the low voltage cable compartment does not have a bottom floor over at least a significant portion of its surface area but instead has a second bottom opening, wherein the LV opening and the second bottom opening are combined and form a single LV common lower opening. A combined LV common lower opening makes it easier for an operator to position the low voltage cables in the low voltage cable entry compartment. The combined LV common lower opening is combined in the sense that it combines a lower portion of the LV-opening and the second bottom opening and it is common in the sense that multiple LV cables enter the LV cable entry compartment via the same opening. The LV common lower opening is not sealed and therefore ground water can enter the LV common lower opening. This is not a problem because the compartment does not comprise water-susceptible equipment below ground level.

[0080] If the covering of the LV opening extends all the way to the bottom end, the LV common lower opening is reduced in size to the second bottom opening by the covering and becomes the same as the second bottom opening. If the covering of the LV opening does not extend all the way to the bottom end, the LV common lower opening is larger than the second bottom opening and the LV cables may enter the LV cable compartment via the part of the LV common lower opening which is the lower part of the LV opening or via the part of the LV common lower opening which is the second bottom opening. This depends somewhat on the curvature of the LV cables, which may vary.

[0081] In some embodiments, the transformer house comprises a second hatch configured to removably cover at least a part of the LV opening, in particular an upper part. The second hatch ensures that the LV opening remains easily accessible to an operator while preventing access to others, improving safety and helping in preventing theft or damage to the inside of the transformer house.

[0082] In some embodiments, the transformer house comprises a public service switchgear cabinet.In some embodiments, the transformer house comprises a public service switchgear cabinet compartment which accommodates the public service switchgear cabinet. By providing a public service switchgear cabinet compartment to accommodate the public service switchgear cabinet, it is easier for an operator to inspect and maintain the public service switchgear cabinet. Advantageously, the maintenance of the public service switchgear cabinet compartment can be outsourced if separate access to this compartment can be provided. This also improves safety because the public services switches and cabling is located remote from the LV switchgear cabinet and LV rack.

[0083] In some embodiments, the public service switchgear cabinet is located on a same side of the transformer house as the LV cable entry compartment, namely on the cable entryside, and in particular situated between the LV cable entry compartment and the middle voltage cable entry compartment. Having the public service switchgear cabinet located on the same side of the transformer as the LV cable entry compartment ensure that installation and connection of the public service cables is simpler and easier for an operator and for a supplier or producer of transformer houses.

[0084] In some embodiments, two PS cable systems are supported. Both PS cabling combined with the LV cable as separate (solo) PS cabling can be terminated in the same PS switchgear cabinet.

[0085] Embodiment with LV connectors

[0086] In a further embodiment, the transformer house comprises low voltage connectors, wherein the low voltage connectors are provided in the LV cable entry compartment. This is an alternative solution which stays relatively close to existing solutions. Low voltage connectors improve the ease of installation of the low voltage cables by facilitating direct installation of all LV cables in the cable entry compartment. This embodiment has LV bridge parts which connect the LV connectors with the LV switchgear cabinet. The LV bridge parts may be factory installed cabling between the LV switchgear cabinet in the LV switchgear cabinet compartment, via a simplified symmetrical cable bridge, to the corresponding (high) side on the LV connector. There may be 8 LV connectors.

[0087] In some embodiments, the transformer house comprises public service (PS) connectors, wherein the public service connectors are accommodated in the low voltage cable entry compartment, in particular below the low voltage connectors, and public service bridge parts which connect the public service connectors with the public service switchgear cabinet, wherein the public service cables are connected to the public service connectors.This solution works only in combination with the use of low voltage connectors to facilitate all LV cable installation work to be done in the cable entry compartment when only a limited length of the LV cables is available.

[0088] . The public service connectors are connected to the public service switchgear cabinet through the public service bridge parts and the factory (pre)installed PS cabling. In this embodiment there will also be low voltage connectors.

[0089] In some embodiments, the public service connectors and the public service switchgear cabinet are accommodated in separate compartments.

[0090] Removable panels

[0091] In some embodiments, the transformer house comprises one or more removable panels configured for removably covering at least a part of the MV opening and / or the LV opening. The removable panels result in a strong barrier preventing access to the inside of the transformer house while at the same time allowing for easy access to an operator.

[0092] In some embodiments, each of the one or more removable panels are made from concrete. Making the panels from concrete improves their longevity. Other materials may also be possible.

[0093] In some embodiments, an upper end of each removable panel comprises a step and a lower end of each removable panel comprises a mating skirt, allowing stacking of removable panels by each time letting the skirt of an upper panel mate with the step of a lower panel. The step and skirt allow for easy and intuitive stacking of multiple panels.

[0094] In some embodiments, the transformer house comprises a left post and a right post for each of the MV opening and LV opening, wherein the left and right post have a tongue or a groove, and wherein each panel comprises a left side and a right side which have the other of the tongue or groove, allowing the removable panels to slide up and down in order to close off the MV opening and LV opening or to open the MV opening and LV opening. The left post and the right post favourably hold the panels and help prevent their removal from anyone other than an operator through the use of tongue-and-groove connections. The left and right post may comprise a recess at an upper portion of the MV and LV opening, wherein the panels may be slid upwards to the recess and removed from the MV and LV opening.In some embodiments, when seen in front view each panel has a rectangular contour with rounded corners, allowing the panels to be rotated relative to the posts about a horizontal rotation axis which is orthogonal to a front surface of the panel, wherein rotation of the panel from a substantially horizontal orientation over the removal angle to an inclined or vertical orientation allows for removal of said at least one or more removable panels from the MV opening or LV opening. The rounded corners allow the panel to be more easily removed to provide access through the MV opening or the LV opening. The removal angle may be between and including 20-40 degrees, in particular 30 degrees.

[0095] In some embodiments, each panel comprises a gripping recess configured for allowing gripping of the at least one of the one or more removable panels, in particular gripping by hand.

[0096] In some embodiments, an upper portion of the MV opening and / or LV opening is covered by respectively the first or second hatch, and wherein a lower portion of the MV opening and / or LV opening is covered by the one or more removable panels.

[0097] By combining the use of a hatch and one or more removable panels, the upper portion of the MV opening or LV opening remains easily accessible through the hatch, and the lower portion of the MV opening or LV opening remains accessible through removal of the one or more removable panels.

[0098] Removable panels - independent aspect

[0099] The removable panels form an independent aspect of the present invention. In this independent aspect, the invention relates to a transformer house comprising:

[0100] - a house having walls,

[0101] - a transformer positioned within the house,

[0102] - at least an MV cable entry compartment and / or an LV cable entry compartment within the house,

[0103] wherein the house comprises a MV opening configured to provide access for an operator to the MV cable entry compartment and / or a LV opening configured to provide access for an operator to the LV cable entry compartment,

[0104] - one or more removable panels configured for removably covering the MV opening and / or the LV opening.

[0105] The removable panels result in a strong barrier preventing access to the inside of the transformer house while at the same time allowing for easy access to an operator.In some embodiments, an upper end of each removable panel comprises a step and a lower end of each removable panel comprises a mating skirt, allowing stacking of removable panels by each time letting the skirt of an upper panel mate with the step of a lower panel.

[0106] The step and skirt allow for easy and intuitive stacking of multiple panels.

[0107] In some embodiments, the transformer house comprises a left post and a right post for each of the MV opening and LV opening, wherein the left and right post have a groove or a tongue, and wherein each panel comprises a left side and a right side which have the other of the groove or tongue, allowing the removable panels to slide over a vertical distance relative to the left and right post.

[0108] In some embodiments, the groove or tongue of the left and right post do not extend over the full length of the left and right post.

[0109] In some embodiments, the transformer house comprises a left stop at the left post and a right stop at the right post, wherein the left and right stop are adjustable in height, wherein a lowest panel rests on the left and right stop, and wherein by adjusting the height of the left and right stop the height of the lowest removable panel can be adjusted.

[0110] In some embodiments, when seen in front view each panel has a rectangular contour with rounded corners, allowing the panels to be rotated relative to the posts about a horizontal rotation axis which is orthogonal to a front surface of the panel, wherein rotation of the panel from a substantially horizontal orientation over the removal angle to an inclined or vertical orientation allows for removal of said at least one or more removable panels from the MV opening or LV opening.

[0111] In some embodiments, each removable panel comprises a centring notch on an upper or lower end and a centring protrusion on the other of the upper and lower end, wherein the centring notch of a first removable panel is configured to receive a centring protrusion of an adjoining removable panel, thereby aligning said removable panels with one another.

[0112] In some embodiments, each of the one or more removable panels are made from concrete. Other materials may be possible.

[0113] Cable bridgeIn another independent aspect, the invention relates to a transformer house comprising:

[0114] - a low voltage (LV) switchgear cabinet configured for controlling and switching the LV current leaving the transformer house via LV cables,

[0115] - an LV switchgear cabinet compartment which accommodates the LV switchgear cabinet,

[0116] - an LV cable entry compartment,

[0117] - a number of LV-cables, wherein the LV cables enter the transformer house via the LV cable entry compartment, wherein the LV switchgear cabinet compartment and the LV cable entry compartment are separate, and

[0118] - a cable bridge, wherein the cable bridge is configured to support and provide a path for the LV cables from the LV cable entry compartment to the LV switchgear cabinet compartment.

[0119] The cable bridge supports and provides a path for the LV cables (split into the three phase cables)

[0120] In some embodiments, the transformer house comprises a roof, wherein the cable bridge is located directly underneath the roof.

[0121] In some embodiments, the cable bridge is completely closed at a bottom and at the sides to prevent the inlet of warm air due to transformer operation.

[0122] BRIEF DESCRIPTION OF THE FIGURES

[0123] Figures 1 A - 1 D show isometric views of an embodiment of the transformer house according to the invention.

[0124] Figures 2 -3 show isometric views of an embodiment of the transformer house of the invention, wherein the roof of the transformer house is not shown.

[0125] Figure 4 shows a top view of the transformer house of Figures 2 -3.

[0126] Figures 5A and 5B show side cross-sectional views of an embodiment of a transformer house according to the invention.

[0127] Figure 5C shows a side-cross-sectional view of a transformer house having another embodiment of the LV cable bridge.

[0128] Figure 6 shows a close-up view of a part of a low voltage cable entry compartment and a public service switchgear compartment of an embodiment of a transformer house according to the invention.Figures 7 shows a sectional front view of the embodiment of figs. 6A and 6B.

[0129] Figure 8 shows an embodiment of middle voltage cable connectors and bridge parts according to the invention.

[0130] Figures 9A, 9B and 9C show a side cross-sectional view, an isometric view and a top view of another embodiment of the MV switching cabinet according to the invention.

[0131] Figure 10 shows a front view of a low voltage cable entry compartment and removable panels according to an embodiment of a transformer house according to the invention.

[0132] Figures 11A - 11D show an embodiment of removable panels of a transformer house according to the invention.

[0133] Figure 11 E shows a detail of a right stop supporting a removable panel (seen from inside up).

[0134] Figure 11 F shows a detail of a right post bordering an LV opening or MV opening as (seen from outside down).

[0135] Figures 12A - 12B show front and side views respectively of two transformer houses according to the prior art to the left of the figures and of a transformer house according to the invention at two different installation depths.

[0136] Figures 13A-13D show a LV-connector.

[0137] Figures 14-14D show further embodiments of the transformer house.

[0138] Figures 15A-15B show an embodiment of the LV cable system.

[0139] Figures 16A-16B show another embodiment of the transformer house.

[0140] Figures 17A-17B show a freedom in cable routing in the direct circumference of the transformer house of the embodiment with a rounded floor.

[0141] Figures 18A-18B show an embodiment of LV bridge parts.

[0142] Figures 19-20 show the ventilation of an embodiment of the transformer house.

[0143] Figure 21 shows another embodiment of the transformer house.

[0144] Figures 22A and 22B show an embodiment of a PS cable entry compartment.

[0145] Figures 23A-23D show a roof ventilation system.

[0146] Figures 24A-24E show a further embodiment having ducts.

[0147] Figures 25A-25D show a further embodiment of the MV connector.

[0148] Figures 26A-26D show a further embodiment of the LV connector.

[0149] DETAILED DESCRIPTION OF THE FIGURES

[0150] It will be clear that the description above is intended to illustrate the operation of preferred embodiments of the invention, and not to reduce the scope of protection of the invention. Starting from the above description, many embodiments will be conceivable to the skilled person within the inventive concept and scope of protection of the present invention as defined by the appended set of claims.Turning to Figures 1A-1D, isometric views according to an embodiment of a transformer house 10 according to the invention are shown. The transformer house 10 comprises a house 5 having outer walls 7 and a roof 112. The transformer house 10 comprises a transformer 20 positioned within the house. The ground level is indicated with 200. The walls, roof and floor of the transformer house form a structure 2. The transformer house 10 is located at least partially below ground level. The transformer 20 and MV switchgear cabinet is also located at least partially below ground level. Unlike transformer some houses of the prior art, the transformer house has a single floor. The main components are positioned in roughly a same horizontal plane, not vertically above one another as in some prior art transformer houses. This allows a low profile of the transformer house

[0151] The transformer house 10 has an MV opening 30 and an LV opening 92 which are discussed further below. The transformer house 10 comprises a first hatch 32 configured to cover at least a part of a MV opening 30. The transformer house comprises a second hatch 46 configured to cover at least a part of a LV opening 92. The hatches may be opened and closed. Below the hatches 32,46, removable panels 34 are provided which are discussed further below.

[0152] The transformer house 10 comprises a middle voltage switchgear cabinet compartment 11 which accommodates the middle voltage switchgear cabinet 28. The MV switchgear cabinet is also called the RMU (Ring Main Unit). The middle voltage switchgear cabinet compartment 11 is configured to be accessed by an operator above-ground. An operator area 8 is located inside the house 5 in front of the middle voltage switchgear cabinet 28. The transformer house further comprises a public service switchgear cabinet 96 which is closed off by a third hatch 47. Further hatches are provided to close off other openings in the house 5.

[0153] General configuration and middle voltage

[0154] Turning to Figures 2 -4, isometric views and a top view of the transformer house 10 according to the invention are shown, wherein a roof 112 of the transformer house 10 is not shown in these figures. The top view of the transformer house 10 shows a plurality of compartments 6, 11, 12, 14, 16, 18 defined by the outer walls 7 and innerwalls 4.

[0155] The transformer house 10 comprises a transformer compartment 12. The middle voltage switch gear compartment 11 and the transformer compartment 12 form a combined compartment since inner wall 4.3 is low and only partially (< 50%) separates both compartments from each other. The transformer compartment and middle voltage switch gearcompartment are closed in the sense that it does not have openings below a threshold 99 which is positioned at a distance of H3 above ground level 200

[0156] Middle voltage cables 26 enter the transformer house 10 via a middle voltage (MV) cable entry compartment 6. The middle voltage (MV) switchgear cabinet 28 is configured for controlling and switching the middle voltage current entering the transformer house 10 via the middle voltage cables 26. A middle voltage switchgear cabinet compartment 11 accommodates the middle voltage switchgear cabinet 28. The MV cable entry compartment 6 is separated from the MV switchgear cabinet compartment 11 by a first inner wall 4.1. The first inner wall is not a floor and is oriented vertically or substantially vertically.

[0157] The middle voltage (MV) is generally above 1kV and typically at 6kV, 10kV or 20kV. The low voltage is typically up to 1000 Volt, but this may vary.

[0158] The transformer house 10 comprises a number of middle voltage connectors 22. An end 24 of each middle voltage cable 26 is connected to an associated middle-voltage connector 22. The end 24 is typically provided with a busbar coupling 25. Each busbar coupling in particular has a T-shape or an L-shape. Each middle-voltage connector 22 has a substantially horizontal orientation and an end 24 of each middle voltage cable 26 is oriented substantially vertically. Each busbar coupling 25 connects the substantially vertically oriented cable end to the substantially horizontal middle-voltage connector 22. The MV cables are not connected directly to the MV switchgear cabinet but are connected indirectly to the MV switchgear cabinet.

[0159] The middle voltage cable entry compartment 6 and the middle voltage switchgear cabinet compartment 11 are accessible via different sides of the house 5, in particular via opposite sides of the house 5. The MV opening 30 is located in an outer wall 7 at the middle voltage cable entry compartment 6, wherein said MV opening 30 provides access for an operator to the middle voltage connectors 22. The MV cable entry compartment is considered open because of the MV opening.

[0160] The middle voltage cable entry compartment 6 does not have a floor over a significant portion of its surface area. Rather, it is open at a bottom end and forms a bottom opening 122. Via the bottom opening 122, the middle voltage cables 26 can enter the middle voltage cable entry compartment 6 without having to extend through a narrow opening in a floor or wall of the house 7. This results in improved ergonomics for the electricians during cable placement.The electricians do not need to bend over deeply into the mud and can have a more comfortable posture. Also, the required force for placement of the MV cables is less.

[0161] The MV opening 30 extends all the way down in the sense that the structure 2 does not have a threshold below the MV opening 30 or has a removable threshold, such that the MV opening 30 is connected to the first bottom opening 122, forming a combined MV lower opening 301. The combined MV lower opening is a common opening which is shared by multiple MV cables and possible ducts and therefore called an MV common lower opening 301. The MV common lower opening 301 may have a surface area which is greater than four times or in some case twelve times the surface area of a cross-section of the MV cables. A part of the MV opening is covered by the removable panels 34. A lower part of the MV opening 30 below the removable panels 34 may remain uncovered and in that case is also considered to be part of the MV common lower opening 301 through which the MV cables and or ducts extend.

[0162] The MV common lower opening 301 and the LV common lower opening 302 have a surface area of at least four times the surface area of a cross-section of a single MV cable respectively LV cable, more in particular at least twelve times the surface area of a crosssection of single MV cable respectively LV cable. The MV and LV cable entry compartments are separated from the transformer compartment by a wall that is liquid tight until a water level would reach the first opening in the inner wall 4.1 , at least above a threshold 99 which positioned at a distance of H3 above ground level 200.

[0163] The middle voltage cable entry compartment 6 is not watertight at a lower end but rather open. In other words, the MV common lower opening 301 is not sealed but remains open.

[0164] The at least one compartment 12 which accommodates water-susceptible equipment below ground level does not have openings below a threshold 99 - which is at a height H3 above ground level - towards the outside in the walls and floor directly surrounding that compartment, and compartments 6,14 which have directly surrounding walls and / or a floor having one or more openings 301, 302, 122, 92 below ground level towards the outside do not accommodate water-susceptible equipment below threshold 99 - which is at a height H3 above ground level 200. In this way, there is no risk or virtually no risk of flooding. There are no gaskets or seals which after some time may start to leak, resulting in flooding of the transformer compartment, MV switchgear cabinet compartment and / or the LV switchgear cabinet compartment.The middle-voltage connectors 22 are located above an inflow height H3 of the middle voltage switchgear cabinet compartment 11. At water levels above this inflow height H3, water can enter the middle and low voltage switchgear cabinet compartment 11, 16 and the transformer compartment 12. The inflow height H3 is the height of the lowest threshold 99 of the middle voltage switchgear cabinet compartment 11 above ground level 200. The transformer house is closed below the threshold 99, i.e. does not have any possible leaks below the threshold 99. This provides improved resistance against flooding. It also results in a longer lifespan because there are no seals which may wear, resulting in leakage.

[0165] When seen in top view, the transformer house 10 has a rectangular shape. The transformer 20 is located in a right portion 84. The middle voltage connectors 22 with the middle voltage switch gear cabinet 28 are located in a left portion 86. MV transformer feeder cables 17 run from the MV switchgear cabinet 28 to the transformer 20.

[0166] In fig. 4 the MV cables 26 and LV cables 50 extend at right angles to a longitudinal outer wall 7, but this need not be the case. The cables 26,50 may extend at a different angle a, see the dashed lines 51. This provides more freedom and flexibility in the placement of the transformer house 10 relative to a cable bed in a street and allows a more effective ground cable route. For instance, the transformer house 10 can be placed closer to a road. This will be explained in more detail in fig. 23A and 23B.

[0167] Low voltage

[0168] The transformer house further comprises:

[0169] - a low voltage (LV) cable entry compartment 14 via which the low voltage cables enter the transformer house,

[0170] - a low voltage switchgear cabinet 52 configured for controlling and switching the low voltage current leaving or entering the transformer house via the low voltage cables, and

[0171] - a low voltage switchgear cabinet compartment 16 which accommodates the low voltage switchgear cabinet 52.

[0172] The LV cable entry compartment 14 and the low voltage switchgear cabinet compartment 16 are accessible from opposite sides of the transformer house. The LV cable entry compartment 14 and the MV cable entry compartment 6 are located on a same side of the transformer house. The LV switch gear cabinet compartment 16 is separated by a second inner wall 4.2 from the transformer compartment 12.The house has a LV opening 92 in its outer wall at the low voltage cable compartment. Said LV opening extends all the way down in the sense that the LV opening does not have a threshold. The low voltage cable compartment does not have a bottom floor over at least a significant portion of its surface area but instead has a second bottom opening 124. The LV opening 92 and the second bottom opening 124 are combined and form a combined LV common lower opening 302. It is combined because it combines a lower portion of the LV opening and the second bottom opening and it is common because it is shared by multiple LV cables. This results in improved ergonomics for the electricians during cable placement of the LV cables. The electricians do not need to bend over deeply into the mud and can have a more comfortable posture. Also, the required force for placement of the LV cables is less. The LV common lower opening 302 is not sealed and groundwater may enter the LV cable entry compartment. The LV cable entry compartment is considered open because of the LV lower opening.

[0173] The MV opening 30 and the LV opening 92 are located on a same side of the transformer house 10. This side is called the cable entry side 102. The opposite side is called the operator side 103.

[0174] Public service and LV

[0175] Turning to figure 6, the transformer house comprises a public service (PS) switchgear cabinet 96 which is connected to public service cables 98. The public service switchgear cabinet 96 is located in a public service switchgear cabinet compartment 18 which is adjacent the LV cable entry compartment 14 and is closed by a hatch. The public service switchgear cabinet compartment 18 is located between the MV cable entry compartment and the LV cable entry compartment. The public service cables 98 split off from a respective low voltage cable 50 and terminated on the PS connector 94. Four PS cables 98 are split off from each low voltage cable 50. The PS connector and PS bridge parts are accessible and serviceable.

[0176] The public service cables 98 may be supported by a bridge. The public service cables are typically for public lighting.

[0177] The low voltage cables 50 without the public service cables fase grounding cable and cable shield are indicated with numeral 501 and each comprise three phase cables 502.1, 502.2, 502.3 and extend further upwards. The low voltage cables 501 extend over a cable bridge 136 to the other side of the transformer house. The three phase cables 502.1, 502.2, 502.3 of the low voltage cables 501 are directly connected to the LV strip in the LVswitchboard cabinet 52. The LV switchboard cabinet 52 comprises a three phase cable connectors for each LV strip. Each of the three phase cables 502.1 , 502.2, 502.3 is connected to one of the three phase cable connectors.

[0178] Turning to Figure 5A, the middle-voltage connectors 22 are located at an upper part of the transformer house 10 and are in particular located at a first connector height H1 above a floor 174 of the transformer house 10. The first connector height H1 is more than 75 percent of a total height H2 of the house 10. The transformer house 10 has a first, lower floor 174 which supports the transformer, and a second, higher floor 175 which forms the level at which the MV switchgear cabinet is supported. The height H2 is measured from the lower floor 174.

[0179] A height H5 of the lowest inflow threshold 99 above the floor 174 of the transformer house is at least 40, more in particular at least 50 percent of the total height H2 of the transformer house. This allows a relatively deep positioning of the transformer house into the ground, with a low height H4 above ground.

[0180] Turning to fig. 5B, when seen in side view, the low voltage cables 50 enter the transformer house via a lower portion of the LV cable entry compartment 14. Here, at the foot of the transformer house, the LV cables curve upward in a first curve 231 and extend further upward to a second curve 232. The LV cables then extend over the transformer to the low voltage switchgear cabinet 52 which is on the other side of the transformer house. Here, the LV cable have a straight horizontal section 232. The LV cables then connect to an upper side of the low voltage switchgear cabinet 52. This connection is also relatively high.

[0181] Because the PS switchgear cabinet 96 is in a separate compartment and separately accessible, maintenance for this part can be subcontracted separately. Because the PS cables 98 are split off from the LV cables 50 early, they do not reach the LV switchgear cabinet which advantageously improves safety and reduces cabling route complexity and cost.

[0182] Fig. 7 shows a sectional view of the interior of the transformer house 10.

[0183] MV bridge parts

[0184] Turning to Figure 8, each middle voltage connector 22 comprises a first connector end 114. Each first connector end 114 is configured to allow an end 24 of a middle voltage cable 26 to be connected to it. Each end 24 of an MV cable has a busbar coupling 25. Each middlevoltage connector 22 comprises a second connector end 116. Each second connector end 116 is configured to connect to the middle voltage switchgear cabinet 28.

[0185] Middle voltage bridge parts 58, connect the second connector ends 116 with the middle voltage switchgear cabinet 28. Each middle voltage bridge part 58 comprises a cable and a busbar coupling 25 on each end of the cable. Alternative couplings on the ends are also possible. When seen in side view the middle voltage bridge parts 58 extend downward from the middle voltage connectors 22 and curve upward and enter the middle voltage switch gear cabinet 28 from a lower side.

[0186] When seen in side view, the middle voltage bridge parts 58 have a U-shape with legs of uneven length. When seen in side view, the leg of the U-shape of each middle voltage bridge part 58 which connects to the associated middle voltage connector 22 is longer than the leg of the U-shape which connects to the middle voltage switchgear cabinet 28.

[0187] The transformer house 10 comprises at least two middle voltage connector groups 88, in particular three middle voltage connector groups 88, wherein each middle voltage connector group 88 comprises at least three middle voltage connectors 22. Each middle voltage connector 22 is pivotable about a substantially horizontal axis 91 between a use position 118 and an access position 120 in which an operator can access the associated bridge part 58. In particular each group 88 of three MV connectors 22 is pivotable, wherein the three middle voltage connectors 22 of a group are mounted on a common pivotable panel member 89.

[0188] To facilitate this, a integrated / rounded handle bar 93 is applied on the pivotable panel 89. Since the handlebar 93 is positioned at a distance to the hinge of minimal a factor 3 of the relative position of the MS connector cable bracket 97 to the hinge of the MS connector, the leverage is enough to apply the required force by one person to lift and tilt a group of 3 connected MV bridge cables.

[0189] Returning to Figure 4, the first connector end 114 and the second connector end 116 are located in separate compartments 6, 11. The first connector end 114 and the second connector end 116 are located on opposite sides of the first wall 4.1. Each MV connector 22 traverses the first wall 4.1 , when seen in top view.

[0190] Alternative design for LV

[0191] Turning to figures 5C, 6, 18A up to 18D, in another embodiment, the transformer house 10 comprises low voltage connectors 48, wherein the low voltage connectors areprovided in the LV cable entry compartment. The LV cables 50 are connected to LV cable brackets 49 and it’s individually split LV phase cables to the LV connector 48 and end there. Separate LV bridge parts 505, here comprising LV bridge cables, extend from each LV connector 48 to the LV switchgear cabinet, which is on the other side of the transformer house. Each LV bridge part 505 comprises three phase cables. 512.1 , 512.2 and 512.3.

[0192] In this embodiment, the transformer house comprises public service connectors 94, which are accommodated in the low voltage cable entry compartment 14, and public service bridge parts 126 which connect the public service connectors 94 with the public service switchgear cabinet 96. The public service cables 98 are split off from the LV cables 50 and are connected to the public service connectors 94. In this embodiment, the public service connectors 94 and the public service switchgear cabinet 96 are accommodated in separate compartments.

[0193] The transformer house 10 comprises a public service switchgear cabinet compartment 18 which accommodates the public service switchgear cabinet 96. The public service switchgear cabinet compartment 18 is located on a same side of the transformer house as the LV cable entry compartment 14, namely on the cable entry side 102 and in particular situated between the LV cable entry compartment 14 and the MV cable entry compartment 6.

[0194] In this embodiment, all on-site cable installation activities for LV and PS are limited to a single compartment, the LV cable entry compartment. The other cables can be preinstalled. The LV connectors 48 and PS connectors 94 allow simple installation of the LV cables and the PS cables which are split off from the LV cables.

[0195] The LV connector 48 and PS connectors 94 are positioned relatively high in the cable entry compartment. The installation procedure is similar to current procedures, but improved because the PS cables 98 are simpler and more ergonomical. The PS cables 98 are also accessible for visual inspection. The PS cables 98 do not reach the LV switchgear cabinet, which significantly improves safety.

[0196] In another embodiment the LV cable bridge is closed underneath and at the sides parallel to the LV bridge cables to prevent hot transformer air heating up the LV bridge cables from the transformer compartment underneath. The LV bridge cables are supported and in direct contact with the LV bridge frame structure. The surrounding sheet material underneath and besides the cable bridge structure secure isolation from the transformer compartment and are connected directly on the LV bridge frame structure without contact with the LV bridge cables.In another embodiment of the later explained roof element a different orientation of the internal skirts isolate the LV cable bridge from the transformer compartment by roof skirts placed above the vertical walls of the LV bridge. By doing so the roof ventilation facilities on both open sides of the LV cable bridge in respectively the LV cable entry compartment and the LV switching cabinet compartment support natural ventilation of access heat from the LV bridge cables.

[0197] Alternative design for MV

[0198] Turning to figures 9A, 9B, and 9C, in an alternative design for the middle voltage (MV) the transformer house 10 comprises:

[0199] the house 5 having outer walls 7,

[0200] the transformer 20 positioned within the house,

[0201] the middle voltage cable entry compartment 6 via which middle voltage cables 26 enter the transformer house, and

[0202] the middle voltage switchgear cabinet 28 configured for controlling and switching the middle voltage current entering the transformer house via the middle-voltage cables and comprising a number of cabinet connectors 176,

[0203] In this embodiment, each cabinet connector 176 is configured to directly or indirectly connect to a middle voltage cable, wherein the cabinet connectors 176 are positioned at an upper rear side 177 of the middle voltage switchgear cabinet, and wherein the cabinet connectors face the middle voltage cable entry compartment 6. The MV bridge parts 58 are no longer necessary, which results in a simpler overall construction. The MV switchgear cabinet comprises a control panel on a forward side 181 thereof. The forward side is opposite the rear side 177. This aspect can be regarded as an independent invention.

[0204] The end 24 of each middle voltage cable 26 is connected to an associated cabinet connector 176 via a busbar coupling 25, wherein the busbar coupling in particular has a T-shape or an L-shape. Each cabinet connector 176 has a substantially horizontal orientation and wherein an end of each middle voltage cable 26 is oriented substantially vertically, and wherein each busbar coupling connects the substantially vertically oriented cable end to the substantially horizontal cabinet connector 176.

[0205] The transformer house comprises:

[0206] a middle voltage switchgear cabinet compartment 11 which accommodates the middle voltage switchgear cabinet 28,a floor plate 178, wherein the floor plate is configured to close off a lower part of the middle voltage switchgear cabinet compartment underneath the middle voltage switchgear cabinet, wherein the floor plate is substantially horizontal.

[0207] Blow-out openings 179 are provided adjacent the MV switchgear cabinet 28. In case of an explosion of the MV switchgear cabinet 28, the gases which are directed downwards to a compartment 180 underneath the MV switchgear cabinet 28 can escape via the blow-out openings 179.

[0208] Removable panels

[0209] Turning to figures 10 and 11A-11F, the transformer house 10 comprises one or more removable panels 34 configured for removably covering at least a part of the MV opening 30 and / or the LV opening 92. An upper end of each removable panel comprises a step 156 and a lower end of each removable panel comprises a skirt 158, allowing stacking of removable panels by each time letting the skirt of an upper panel mate with the step of a lower panel. This prevents water ingress and allows load sharing between panels in case of horizontal loads.

[0210] The transformer house 10 comprises a left post 132 and a right post 134 for each of the MV opening 30 and LV opening 92, wherein the left and right post have a tongue or a groove 42a, in this case a groove. The groove or tongue of the left and right post do not extend over the full length of the left and right post. Each panel comprises a left side 160 and a right side 162 which have the other 252 of the tongue or groove, allowing the removable panels to slide up and down in order to close off the MV opening and LV opening or to open the MV opening and LV opening.

[0211] When seen in front view each panel 34 has a rectangular contour with rounded corners, allowing the panels to be rotated relative to the posts about a horizontal rotation axis which is orthogonal to a front surface (104) of the panel. This is shown in fig. 10. Rotation of the panel from a substantially horizontal orientation over the removal angle to an inclined or vertical orientation allows for removal of said at least one or more removable panels from the MV opening 30 or LV opening 92.

[0212] An upper portion of the MV opening and / or LV opening is covered by respectively the first or second hatch 32,46, and a lower portion of the MV opening and / or LV opening is covered by one or more removable panels 34.Each removable panel comprises a centring notch 108 on an upper or lower end and a centring protrusion 110 on the other of the upper and lower end. The centring notch of a first removable panel is configured to receive a centring protrusion of an adjoining removable panel, thereby aligning said removable panels with one another.

[0213] Turning to fig. 11 E, in some embodiments, the transformer house comprises a left stop 300 at the left post and a right stop (not shown) at the right post, wherein the left and right stop are adjustable in height, wherein a lowest panel 34 rests on the left and right stop, and wherein by adjusting the height of the left and right stop the height of the lowest removable panel can be adjusted. The height of the lowest panel is dependent on the level at which the transformer house 10 is installed to provide room for free and unhindered entering MV and LV cables from their designated and fixed depth (not dependent on transformer house installation level).

[0214] T urning to fig. 11 F, at an upper portion of the left and right post 132, 134, a recess 303 in the groove may be provided. The recess 303 allows a panel 34 to be taken out of the groove

[0215] The removable panels 34 may have an aligning notch at the top and an aligning recess at the bottom, wherein an aligning notch of one panel fits into an aligning recess of the panel below it or above it. This aids in proper positioning. The removable panels 34 may have openings for ventilation. The removable panels 34 may have hand grips for easy handling by an operator.

[0216] Installation height

[0217] Turning to figures 12A and 12B, transformer houses of the prior art are shown in black and dark grey. The transformer house 10 of the present invention is shown in light grey at two different installation depths D1. The transformer house 10 comprises a roof 122. The roof is located at a height H4 of between and including 1.2 - 1.9 metres above ground level, in particular at a height H4 of between and including 1.3 - 1.8 metres above ground level 200. The small dashed blue line 202 indicates the highest possible water level at the installation site without causing flooding of the transformer house. The transformer 20 is at least partially located below ground level 200. The transformer and middle voltage switchgear cabinet 28 may also be located partially below ground level. An installation depth D1 of the transformer house below ground level 200 is dependent on the installation depth D2 of the transformer house below the highest anticipated water level 202. In other words, the highest anticipated water level 202 determines the height H4 and the installation depth D1 of the transformer house. If the transformer house is installed in an area where there is no risk of high waterlevels 202, the transformer house can be installed at a relatively great depth D1. In areas where there is risk of flooding and therefore a risk of a relatively high water level 202, the transformer house can be installed higher, i.e. at a lower depth D1. The transformer house of the present invention provides flexibility in height, in the sense that the transformer house can be installed at different levels. This flexibility is an advantage. In figs. 12A and 12B, the two figures in column IV show the transformer house having a height H4 above ground level of 1 ,3m and the two figures in column III show the transformer house having a height H4 above ground level of 1.5m.

[0218] The height H4 is significantly lower than for transformer houses of the prior art, making the transformer house easier to accept by the public. It is less bulky above ground.

[0219] Even in its lowest height H4 position the risk of flooding is less compared with prior art transformer stations.

[0220] Advantageously, the transformer house of the present invention is scalable to a larger size.

[0221] LV connector

[0222] Turning to figures 13A-13D, a LV-connector 48 for connecting three incoming phase cables 502.1, 502.2, 502.3 of an incoming LV cable 50 to three corresponding phase cables 512.1, 512.2, 512.3 of an LV bridge cable 505 is shown. The phase cables 512.1, 512.2, 512.3 are pre-installed. The LV-connector comprises:

[0223] a housing 700,

[0224] a first phase connector 701 ,

[0225] a second phase connector 702 and

[0226] a third phase connector 703.

[0227] Each phase connector has a first entry 705 for an incoming phase cable 512.1, 512.2, 512.3 of the LV bridge cable 505 and a second entry 706 for an associated phase cable 502.1 , 502.2, 502.3. Each phase connector comprises a first fixation device 707 at the first entry and a second fixation device 708 at the second entry for fixating the respective phase cables.

[0228] The housing 700 has a U-shape, and wherein the first, second and third phase connector are positioned within the U-shape. This provides sturdiness, good handling and protection from the sides.The first phase connector 701, second phase connector 702 and third phase connector 703 have different heights 709 for safe installation.

[0229] The LV-connector 48 comprises two pairs of rails 710 for guiding a transparent protection cap (not shown) comprising two corresponding pairs of ribs. Each leg 711 of the U-shape comprises a first rail 710 and a second rail 710 provided on opposite sides of the leg 711.

[0230] The conductive phase strip 713 in each phase connector is made out of an upper half ring and a downwards directed strip to facilitate the transfer of current between the inner cable (upward direction) and ground cable (downward direction). The shape of both ends of the conductive strip can be changed depending on (correspond with) the required form / type of cable.

[0231] Rounded floor

[0232] Turning to figures 14A-14D, an embodiment of a transformer house 10 with a rounded floor 174 is shown. The floor is rounded in a plane 301 which is orthogonal to a longitudinal direction 300 of the transformer house and is straight over at least a part of the floor in the longitudinal direction 300. The rounded floor allows the cables to approach the transformer house from multiple direction, and in particular from all sides. One approach path goes underneath the transformer house. Because the floor is rounded, this embodiment may need piles 195 for a proper foundation. Four piles 195 are arranged in a diamond configuration to allow as many approach paths as possible and facilitate direct support for the loads on the beam between the two piles in the center of the construction (between the MV switchgear cabinet compartment and the Transformer compartment) and direct support for the loads on the end (short) side of the transformer house

[0233] As can be seen in figs 14C and 14D. the MV cable entry compartment comprises at least two separate MV cable entry zones 716A.716B and at least two separate LV cable entry zones 714A, 714B. The MV cable entry zones are separated by ribs 719. The ribs can be of concrete and provide good mounting positions for the cable and duct frame which is discussed further below. The ribs 719 do not enclose any dry area so it is possible to drill in the ribs without risk of leakage.

[0234] Turning to figures 16A-16C, this is another embodiment of the transformer house 10 with rounded floor. This embodiment is a combination of the invention with partly prior art LV solutions (LV cable entry and LV switching integrated and positioned directly above eachother in one cabinet). This integration is supporting the cable flexibility in the same manner as illustrated in figures 14A-14D. The transformer house comprises at least one MV cable 26 or LV cable 50 which extends downwards from the MV cable entry compartment 6 respectively from the combined LV cable entry and LV Switchgear cabinet compartment 514 and curves to underneath the transformer house and extends to an opposite side of the transformer house as the side of the transformer house where the cable entry compartment 6, 514 from which it extends is located. In this the approach from multiple sides is possible. This solution has an additional advantage that the MV and LV cables underneath the transformer house are protected from settlement of the ground which may otherwise create extra tension in the cables. In areas with a large expected settlement of the ground, this is a preferred option. In the figures, not all cables extend underneath the transformer house (this is done just for illustration purposes: multiple and various cable layouts are supported).

[0235] The MV cables 26 or LV cables 50 extend downward from the MV cable entry compartment 6 respectively from the LV cable entry compartment 514 (respectively the PS cable entry compartment) and curve in different directions, when seen in top view.

[0236] In the embodiment of figures 16A-16C, the MV cable entry compartment 6 and the combined LV cable entry and LV switchgear cabinet compartment 514 are on opposite sides of the transformer house. The MV switchgear cabinet is accessible from the opposite side of the MV cable entry compartment.

[0237] Turning to figs. 17A and 17B, in this embodiment, the MV cable entry compartment 6 and the LV cable entry compartment 14 are on the same side of the transformer house (in line with the layout in figures14A-14D). The MV switchgear cabinet and the LV switchgear cabinet are accessible from the opposite side, the operator side, of the transformer house. Note that in this transformer house embodiment two general services compartments (in between the LV cable entry compartments and MV cable entry compartments) are located. Suited for PS services and other services.

[0238] The embodiment of figs. 17A and 17B also has a plurality of ducts 310. Each duct has a substantially horizontal section 311, a curved section 312 and a substantially vertical section 313. The vertical section enters the MV cable entry compartment 6 or the LV cable entry compartment 14 or, if present, the PS cable entry compartment. An upper end 314 of the duct is located higher than ground level, and the ducts are configured to let a cable extend through it. The ducts have an advantage that when they are installed with the transformer house, the cable do not need to be installed at the same time. They can be installed later. The ducts 310 are open and groundwater can flow in from the lower opening. This is not a problem becausethe cables 26, 50 are watertight. The ducts enter the MV cable entry compartment 6 or the LV cable entry compartment via the MV or LV common lower opening 301, 302, like the cables.

[0239] Turning to figures 15A, 15B, 18A and 18B, an embodiment with LV connectors 48 and LV bridge parts is shown. The transformer house has a LV switchgear cabinet 52 and LV connectors 48. The LV connectors 48 are in the LV cable entry compartment 14. An end of each LV cable 50 is connected to each LV connector 48. The LV connectors are located in an upper portion of the LV cable entry compartment 14. LV bridge parts 505 comprising LV bridge cables extend between the LV cable entry compartment 14 and the LV switchgear cabinet 52. One end of each LV bridge part 505 is connected to an LV connector 48 and the opposite end of each LV bridge part 505 is connected to the LV switchgear cabinet 52 in the LV switchgear cabinet compartment 16. Each LV bridge part extends downward from the LV connector 48, extends underneath the transformer 20 in the transformer compartment 12 and extends upward to the LV switchgear cabinet 52. Rigid LV bridge parts 505 are also conceivable.

[0240] The transformer house 10 comprises a second inner wall 4.2 which separates the LV switchgear cabinet compartment 16 from the transformer compartment 12. The second inner wall has one or more openings 320 at a lower portion thereof or does not extend fully to the floor, thereby creating a gap 320 between a lower end of the second inner wall 4.2 and the floor 174. The opening or gap allows passage of air for ventilation and LV bridge parts 505 between the LV switchgear cabinet compartment 16 and the transformer compartment 12.

[0241] The transformer house 10 comprises a third, partly removable inner wall 4.4 which acts as a transformer heat shield. The third inner wall separates the LS cable entry compartment 14 from the transformer compartment 12, wherein the transformer heat shield has one or more openings at a lower portion thereof or does not extend fully to the floor, thereby creating a gap 321 between a lower end 323 of the third inner wall 4.4 and the floor 174. The opening or gap allows passage of air and LV bridge parts between the transformer compartment 12 and the LV cable entry compartment.

[0242] Each LV connector 48 is pivotably mounted, wherein each LV connector is pivotable about a horizontal axis between a use position, shown in figs. 15A and 18A, in which the LV connector is preferably upright, and an access position, shown in figs. 15B and 18B, which is preferably pivoted forward and more preferably horizontal, and in which access position the LV bridge part is accessible for an operator. In the access position the LV bridge parts can be seperately replaced. The LV connectors 48 are mounted on a common frame 348 which pivots multiple LV connectors together. This provides a simple and reliable construction.The MV bridge part 58 and the LV bridge part 505 can be replaced by the following method: - pivoting the MV connector 22 or the LV connector 48 about a substantially horizontal pivot axis 349 from a use position 118 to an access position 120 in which an operator can access the associated bridge part,

[0243] - uncoupling the MV or LV bridge part from the MV or LV connector,

[0244] - uncoupling the MV or LV bridge part from the MV or LV switchgear cabinet,

[0245] - removing the MV bridge part 58 or LV bridge part 505,

[0246] - coupling a new MV or LV bridge part to the MV or LV connector,

[0247] - coupling the new MV or LV bridge part to the MV or LV switchgear cabinet,

[0248] - pivoting the MV or LV connector from the access position 120 to the use position 118.

[0249] In the use position, the LV bridge part lies on the rounded or segmented floor. This may also be the case for the MV bridge part. In the access position, the LV bridge parts 505 are slightly raised from the floor 174. The floor 174 is rounded which provides a good support for the LV bridge part.

[0250] Turning to figs. 19 and 20 in conjunction with figures 15A and 15B, the opening or gap 320 improves the ventilation and cooling in the longitudinal direction (with the largest cooling surface) of the transformer 20. Cool air 330 is drawn in via the LV switchgear cabinet compartment 16 and via a lower portion of a ventilation opening 325 in the end wall 322 and via a lower portion of the MV switchgear cabinet compartment. The cool air which flows in via the LV switchgear cabinet compartment 16 flows through the opening or gap 320 into a lower portion of the transformer compartment 12. Here the cool air is heated by the transformer, flows upward on all sides of the transformer 20 and exits the transformer house via a ventilation opening 325 in the end wall 322, via a ventilation opening 326 in the MV cable entry compartment, via a ventilation opening 327 in the MV switchgear cabinet compartment and via ventilation openings in the roof element which will be discussed further below.

[0251] Turning to fig. 21, in another embodiment, the transformer house 10 comprises a floor 174 which comprises a series of segments 330 which are straight but are oriented at an obtuse angle (a1) relative to one another. This provides the same or similar advantages as the rounded floor but has a simpler casing for the concrete.

[0252] Turning to figs. 22A and 22B, in another embodiment, the transformer house 10 comprises a public service (PS) switchgear cabinet compartment 18 which is configured as a PS cable entry compartment and comprises a PS common lower opening 344 at a lower portion thereof, and wherein the transformer house comprises multiple PS cables 95 which enter thepublic service switchgear cabinet compartment 18 via said PS common lower opening 344, wherein said PS common lower opening is not sealed and allows entry of groundwater. The PS cable entry compartment has a similar construction with panels 34 as the MV and LV cale entry compartment. In this solution, two PS cable systems are supported: the solo PS cable 95 and the PS cables 98 which are integrated in the LV cable 50. They both can be terminated at the centrally located PS cable termination point 127, thereby enabling a single PS switching cabinet to support existing and new PS cable systems simultaneously in any possible mix.

[0253] Roof element

[0254] Turning to figs. 23A, 23B, 23C and 23D, in an independent aspect, a roof element 350 is provided. The roof element can be used to convert an existing and known transformer house into a transformer house having an improved ventilation but can also be used for the present transformer house. The conversion can take place by removing the existing roof and replacing it by the present roof element 350.

[0255] The roof element 350 comprises a horizontal section 351 and a skirt 352 which extends downwards from the horizontal section along a circumference of the horizontal section. When seen in top view the roof element is rectangular and has four sides, wherein the skirt comprises ventilation openings 360 in the skirt. At least three sides of the skirt comprise a ventilation opening.

[0256] The roof element also has at least one inwardly placed skirt 377, which is not at the circumference. Each inwardly placed skirt 377 enables the isolation of the various transformer house compartments to such an extent that a natural flow of warm air between those compartments is obstructed, thereby allocating the various roof element ventilation functions to specific compartments.

[0257] The horizontal section 351 comprises an underside 355, and the ventilation openings extend upward to the level of the underside of the horizontal section.

[0258] The roof element 350 comprises at least one recess 365 in the underside of the horizontal section, wherein the recess borders the skirt and wherein at least one ventilation opening is provided in the skirt which borders the recess. At the recess, the horizontal section has an underside 366 which is higher than the underside 355 of the horizontal section outside of the recess. The ventilation openings 360 extend upward to at least the level of the underside 366of the horizontal section at the recess to prevent pockets of ait air forming under the underside 366 of the horizontal section of the recess.

[0259] The roof element is rectangular and has short sides 370 and long sides 371. At least two ventilation openings are placed, preferably on opposite sides of the roof element or at least at adjoining sides, which adjoining sides enclose a 90 degree angle. The adjoining sides correspond with different faces of the transformer house.

[0260] Cable & duct frame

[0261] Turning to figs. 24A-24E, a combined cable and duct frame 401 is provided. The cable and duct frame can be used in the cable entry cabinets to secure the position of MV, LV and PC cables and ducts 310 up to and including a maximum diameter of 110mm. It is conceivable to further enlarge the cable and duct frame 401 to allow for greater diameters.

[0262] The cable & duct frame can hold cables and ducts, with and without inserted cables, in various combinations and in various directions, thereby supporting the cable route flexibility in this invention.

[0263] The cable and duct frame 401 comprises two sturdy mounting plates 402 to transfer the possible high cumulative cable and duct loads (the latter especially during the cable feeding process) directly towards the transformer’s structure, in particular the ribs 719 of the cable entry compartments, such as the cable entry side of the transformer house wall 7 and / or the side of the cable entry compartment separating walls. By eliminating high loads and insertion of heavy duty anchors in the walls directly surrounding the transformer compartment and MV switching compartment, the long term integrity of the transformer station is secured.

[0264] The cable and duct frame 401 further comprises an upper cable clamp beam 403 and a lower connection profile 405, which may be a U-shaped duct. The mounting plates 402 are connected to opposite ends of both the upper cable clamp beam 403 and the lower connection profile 405. The vertically placed connecting beam 404 between the upper beam and lower connection profile take care of proper load sharing.

[0265] The fixation of the cables 26, 50, 95 takes place via detachable cable clamps 406 on the upper cable beam 403. The fixation of each duct take place via a respective duct clamp 407. The U-shaped duct bracket 408 hooks behind the folded edges of the U-shaped duct connection profile 405. This duct clamp is equipped with an integrated nut-bolt-pressure plate facility 409 to apply pressure on the duct to isolate the duct from movement in the corresponding profile bearing socket 410. This socket is provided with a rib 411 on the topwhich acts as a stop to secure the duct from moving upward during the cable feeding process. The socket 410 is mating the corresponding U-shaped duct connection profile 405 to reduce the ability to rotate.

[0266] The position of the lower connection profile 405 is offset to the rear relative to the upper cable clamp beam 403 and is closer to the wall of the structure of the transformer house compared with the upper cable clamp beam 406. When no duct is necessary, no detachable duct clamp will be present and the relative rearward position of the U-shaped duct connection profile does not limit cable routing flexibility and ease of cable fixation.

[0267] Turning to figs. 24C, 24D and 24E, the duct clamps 407 can be positioned very close to one another by placing adjoining duct clamps upright or inverted in an alternating fashion. The upright duct clamps connect to a lower flange 431 of the duct connection profile 405 as shown in fig. 24E and the inverted duct clamps connect to an upper flange 432 of the duct connection profile 405 in fig. 24D. The brackets 408 of adjoining duct clamps 407 can pass through a narrow gap between two ducts 310 at a different level. In this way the gap can stay small and the ducts can be placed close together.

[0268] Fixed connector solutions

[0269] Turning to figs. 25A-25D and figs. 26A-26D, another embodiment of the MV connector respectively LV connector is provided. Both alternative solutions present a simplified fixed (non -pivotable) connector solution.

[0270] Compared with the pivotable embodiment, the non-pivotable solution is less easy to inspect and replacement of single parts is not recommended. By making use of integrated MV connector-bridge modules 420 and integrated LV connector-bridge modules 430, the downside of a single component replacement is reduced. Instead, each MV connector-bridge module 420 comprises multiple, in particular three, MV bridge cables 358, multiple, in particular three, bus bar couplings 25 for connection to the MV switchgear cabinet 28 and a single MV connector 22 for connection to multiple, in particular three, busbar couplings 25 of a same number of MV cables 50. This embodiment also has the feature that the first connector end is on one side of the first wall 4.1 and the second connector end 116 is on the other side of the first wall.

[0271] Compared with the pivotable embodiment, the integrated connector-bridge modules can be individually tested before installation and therefore reducing the risk of failure to comply with transformer station delivery tests.Compared with the pivotable embodiment, the connection between connector and bridge parts can be hidden and therefore isolated to a greater extent, further reducing the risk of short cutting / high voltage discharge.

[0272] The fixed LV connector-bridge module 430 is slightly different from the MV connector-bridge module 420 in the sense that the LV bridge part 505 makes a 90 degree curve 582 at the fixed LV connector 48 and is inserted into it in a horizontal direction. A single LV bridge part 505 may connect to a single LV connector 48.

[0273] As required, detailed embodiments of the present invention are disclosed herein; however, it is to be understood that the disclosed embodiments are merely exemplary of the invention, which can be embodied in various forms. Therefore, specific structural and functional details disclosed herein are not to be interpreted as limiting, but merely as a basis for the claims and as a representative basis for teaching one skilled in the art to variously employ the present invention in virtually any appropriately detailed structure. Further, the terms and phrases used herein are not intended to be limiting, but rather, to provide an understandable description of the invention.

[0274] The terms "a" or "an", as used herein, are defined as one or more than one. The term plurality, as used herein, is defined as two or more than two. The term another, as used herein, is defined as at least a second or more. The terms including and / or having, as used herein, are defined as comprising (i.e. , open language, not excluding other elements or steps). Any reference signs in the claims should not be construed as limiting the scope of the claims or the invention.

[0275] The mere fact that certain measures are recited in mutually different dependent claims does not indicate that a combination of these measures cannot be used to advantage.

Claims

- 39 -CLAIMS1. T ransformer house (10) comprising:- a house (5) having walls (7) which define a plurality of compartments (6, 11, 12, 14, 16, 18),- a transformer (20) positioned within the house,- a middle voltage (MV) cable entry compartment (6) via which middle voltage (MV) cables (26) enter the transformer house,- a middle voltage (MV) switchgear cabinet (28) configured for controlling and switching the middle voltage current entering the transformer house via the middle-voltage cables,- a middle voltage switchgear cabinet compartment (11) which accommodates the middle voltage switchgear cabinet,wherein the middle voltage cable entry compartment (6) is separated from the middle voltage switchgear cabinet compartment (11) by at least a first wall (4.1).

2. Transformer house (10) according to the preceding claim, wherein each MV cable (26) ends in the first compartment which it enters.

3. Transformer house (10) according to the preceding claim, wherein the MV cables (26) are not connected directly to the MV switchgear cabinet (28) but are connected indirectly to the MV switchgear cabinet via respective MV bridge parts (58).

4. Transformer house (10) according to any of the preceding claims, wherein the first inner wall is not a floor and is oriented vertically or substantially vertically.

5. Transformer house (10) according to any of the preceding claims, further comprising a number of middle-voltage connectors (22), wherein each middle voltage connector comprises:a first connector end (114) configured to allow an end (24) of a middle voltage cable (26) to be connected to it, anda second connector end (116) configured to connect to the middle voltage switchgear cabinet,wherein the first connector end and the second connector end are located in separate compartments and are in particular located on opposite sides of the first wall.

6. Transformer house according to the preceding claim, comprising MV bridge parts (58) which connect the second connector ends (116) with the MV switchgear cabinet.- 40 -7. Transformer house according to the preceding claim, wherein an end (24) of each middle voltage cable (26) is connected to an associated middle-voltage connector (22) via a busbar coupling (25), wherein the busbar coupling in particular has a T-shape or an L-shape, wherein each middle-voltage connector (22) has a substantially horizontal orientation and wherein an end of each middle voltage cable (26) is oriented substantially vertically, and wherein each busbar coupling connects the substantially vertically oriented cable end to the substantially horizontal middle-voltage connector (22).

8. Transformer house according to any of the preceding claims, wherein the middle voltage cable entry compartment (6) and the middle voltage switchgear cabinet compartment (11) are accessible via different and in particular opposite sides of the house.

9. Transformer house according any of the preceding claims, wherein the transformer house (10) is located at least partially below ground level.

10. Transformer house according to any of the preceding claims, wherein the transformer (20) and MV switchgear cabinet (28) are located at least partially below ground level.

11. Transformer house according to any of the preceding claims, wherein the transformer house does not have any underground cable entry opening leading to a compartment that houses water susceptible equipment, in particular the transformer compartment (12), the MV switchgear cabinet compartment (11) and the LV switchgear cabinet compartment (16).

72. Transformer house according to any of the preceding claims, wherein the floor and walls of the transformer compartment (12), MV switchgear cabinet compartment (11) and the LV switchgear cabinet compartment (16) do not have any openings to outside the transformer house below ground level, and in particular do not have any openings to outside the transformer house below an inflow height of the transformer house which is at a height (H3) above ground level.

13. Transformer house according to any of the preceding claims, comprising multiple compartments, wherein compartments which have one or more openings (301, 302) towards the outside below ground level are compartments which do not have water- susceptible equipment, and wherein compartments which have water-susceptible equipment below ground level do not have any openings towards the outside below- 41 -ground level (200) and in particular do not have any openings towards the outside below an inflow height which is at a height (H3) above ground level (200).

14. Transformer house (10) according to any of the preceding claims, wherein the transformer house (10) is located at least partially below ground level, and wherein the transformer (20) and MV switchgear cabinet (28) is located at least partially below ground level, wherein the transformer house comprises:- at least two closed compartments (12, 11) which accommodates water- susceptible equipment below ground level, and wherein said closed compartment does not have openings below ground level towards the outside in the walls and floor of that compartment, and in particular does not have openings below an inflow height which is at a height (H3) above ground level, - at least one open compartment (6,14) which has at least one wall or a floor having one or more openings (301, 302, 122, 92) below ground level towards the outside, and wherein said at least one open compartment does not accommodate water-susceptible equipment.

15. Transformer house according to any of the preceding claims, wherein the middle voltage cable entry compartment does not have a floor over a significant portion of its surface area, but has a first bottom opening (122), such that the middle voltage cables can enter the middle voltage cable entry compartment without having to extend through a narrow opening in a floor or wall of the house.

16. Transformer house according to the any of claims 5-15, wherein the house has a MV opening (30) in an outer wall (7) at the middle voltage cable entry compartment, wherein said MV opening provides access to the middle voltage cable entry compartment, in particular provides access to the MV connectors (22) therein, and wherein the house preferably has an LV cable entry compartment which accommodates LV connectors (48) therein and further comprises a LV opening (92) in the outer wall (7) at the LV cable entry compartment, wherein said LV opening provides access to the LV cable entry compartment, in particular provides access to the LV connectors (48) therein.

17. Transformer house according to any of the preceding claims, comprising:- an MV common lower opening (301) via which multiple MV cables enter the MV cable entry compartment, wherein the MV common lower opening (301) is located below ground level, wherein the MV common lower opening (301) is acombination of the first bottom opening (122) and a lower portion of the MV opening (30), and- an LV common lower opening (302) via which multiple LV cables enter the LV cable entry compartment, wherein the LV common lower opening (302) is located below ground level, wherein the LV common lower opening (302) is a combination of the second bottom opening (124) and a lower portion of the LV opening (92).

18. Transformer house according to the preceding claim, wherein the MV common lower opening and the LV common lower opening have a surface area of at least four times the surface area of a cross-section of a single MV cable respectively LV cable, more in particular at least twelve times the surface area of a cross-section of single MV cable respectively LV cable.

19. Transformer house according to the preceding claim, comprising an MV cable entry compartment and an LV cable entry compartment, wherein the MV and LV cable entry compartments are separated from the transformer compartment by a wall that is liquid tight below ground level, more in particular is at least liquid tight below the threshold (99) having a height H3 above ground level (200).

20. Transformer house according to any of the preceding claims, comprising MV connectors (22) and LV connectors (48) which are located above an inflow height (H3) of the MV switchgear cabinet compartment respectively the LV switchgear cabinet compartment.

21. Transformer house according to any of the preceding claims, wherein the middle voltage cable entry compartment (6) is not watertight at a lower end thereof and in particular has a first bottom opening (122) instead of a bottom floor over at least a significant portion of its surface area.

22. Transformer house according to the preceding claim, wherein said MV opening extends all the way down in the sense that the MV opening does not have a threshold or has a removable threshold, such that the MV opening is connected to the first bottom opening, forming a combined MV / bottom opening23. Transformer house according to any of claims 21-22, wherein the transformer house comprises a first hatch (32) configured to removably cover at least a part of the MV opening.

24. Transformer house according to any of the preceding claims, wherein the MV connectors are located at an upper part of the transformer house and are in particular located at a first connector height (H1) above a floor (174) of the transformer house, wherein the first connector height (H1) is more than 75 percent of a total height (H2) of the house and in any case larger than H5.

25. Transformer house according to the preceding claim, wherein when seen in side view the MV bridge parts (58) extend downward from the MV connectors and curve upward and enter the MV switch gear cabinet from a lower side.

26. Transformer house according to any of the preceding claims, wherein the MV switchgear cabinet (28) is configured for controlling and switching the MV current entering the transformer house via the MV cables (26) and comprises a number of cabinet connectors (176), wherein each cabinet connector is configured to directly or indirectly connect to a middle voltage cable, wherein the cabinet connectors are positioned at an upper rear side (177) of the middle voltage switchgear cabinet and wherein the cabinet connectors face the middle voltage cable entry compartment, wherein in particular blow-out channels are provided adjacent the middle voltage switchgear cabinet.

27. Transformer house according to any of the preceding claims, wherein when seen in top view the transformer house has a rectangular shape, wherein the transformer is located in a right portion (84) and the middle voltage connectors with the middle voltage switch gear cabinet are located in a left portion (86).

28. Transformer house according to any of the preceding claims, wherein each middle voltage connector (22) and / or each LV connector (48) is pivotable about a substantially horizontal axis between a use position (118) and an access position (120) in which an operator can access the associated bridge part.

29. Transformer house according to any of the preceding claims, comprising at least two middle voltage connector groups (88), in particular three middle voltage connector groups, wherein each middle voltage connector group comprises at least three middle voltage connectors, and wherein in particular each MV group is pivotable between a use position and an access position.

30. Transformer house according to any of the preceding claims, wherein the middle voltage switchgear cabinet compartment is configured to be accessed by an operator above-ground.- 44 -31. Transformer house according to any of the preceding claims, wherein the transformer house comprises a roof (112), wherein the roof is located at a height of between and including 1.2-1.9 metres above ground level, in particular at a height of between and including 1.3-1.8 metres above ground level.

32. Transformer house according to any of the preceding claims, comprising a floor (174) which is rounded or which comprises a series of segments which are straight but are oriented at an obtuse angle (a1) relative to one another.

33. Transformer house according to any the preceding claim, wherein the floor is rounded or comprises a series of segments in a plane which is orthogonal to a longitudinal direction and straight over at least a part of the floor in the longitudinal direction.

34. Transformer house according to any of the two preceding claims, comprising at least one MV cable (26) or LV cable (50) or PS cable (98) which extends downwards from the MV cable entry compartment respectively from the LV cable entry compartment respectively the PS cable entry compartment, if present, and curves to underneath the transformer house and extends along the curved or segmented floor to an opposite side of the transformer house as the side of the transformer house where the cable entry compartment from which it extends is located.

35. Transformer house according to any of the preceding claims, wherein the MV cables (26) or LV cables (50) or the PS cables (95), if present, extend downward from the MV cable entry compartment respectively from the LV cable entry compartment respectively the PS cable entry compartment, and curve in different directions, when seen in top view.

36. Transformer house according to any of claims 32-35, comprising an MV bridge part or an LV bridge part, wherein the MV bridge part or LV bridge part lies on the rounded segmented floor.

37. Transformer house according to any of the preceding claims, comprising a plurality of ducts, each duct having a substantially horizontal section, a curved section and a substantially vertical section, wherein the vertical section enters the MV cable entry compartment, the LV cable entry compartment or, if present, the PS cable entry compartment, wherein an upper end of the duct is located higher than ground level, and wherein the ducts are configured to let a cable extend through it.

38. Transformer house according to any of the preceding claims, comprising:- 45 -- a low voltage (LV) cable entry compartment (14) via which the LV cables enter the transformer house,- a LV switchgear cabinet (52) configured for controlling and switching the LV current leaving or entering the transformer house via the LV cables, and - a LV switchgear cabinet compartment (16) which accommodates the LV switchgear cabinet.

39. Transformer house according to the preceding claim, wherein the LV cable entry compartment (14) and the MV cable entry compartment (6) are located on a same side (102) of the transformer house.

40. Transformer house according to any of claims 38-39, wherein the LV switchgear cabinet (52) and the MV switchgear cabinet (28) are located on a same, operator side (103) of the transformer house and are accessible from that same side for an operator, wherein the LV switchgear cabinet (52) and the MV switchgear cabinet (28) are both located on an opposite side of the transformer house as the LV cable entry compartment (14) and the MV cable entry compartment (6).

41. Transformer house according to any of the preceding claims except claim 39, wherein the LV cable entry compartment (14) and the MV cable entry compartment (6) are located on an opposite side of the transformer house.

42. Transformer house according to any of claims 38-41 , wherein the LV cable entry compartment and the LV switchgear cabinet compartment are accessible from opposite sides of the transformer house.

43. Transformer house according to any of the preceding claims, comprising at least two separate MV cable entry zones (716A.716B) and at least two separate LV cable entry zones (714A, 714B).

44. Transformer house according to the preceding claim, wherein the two separate MV cable entry compartments (716A.716B) and the two separate LV cable entry compartments (714A, 714B) are located on a same side of the transformer house, and further comprising at least one Public Service (PS) switchgear cabinet compartment (18) which is located between the two MV cable entry compartments (6A,6B) and the two LV cable entry compartments (14A, 14B), wherein more in particular one or more ‘other services’ compartments, for example a separate Public Service (PS) switchgear cabinet compartment (18A, 18B) are located between the two MV cable entry compartments (6A,6B) and the two LV cable entry compartments (14A, 14B).- 46 -45. Transformer house according to any of claims 38 - 44, wherein the low voltage switch gear cabinet compartment is separated by a second inner wall (4.2) from the transformer compartment.

46. Transformer house according to any of claims 38 - 45, wherein the transformer house has a LV opening (92) in its outer wall at the low voltage cable compartment, and wherein said LV opening extends all the way down in the sense that the LV opening does not have a threshold, wherein the low voltage cable compartment does not have a bottom floor over at least a significant portion of its surface area but instead has a second bottom opening (124), wherein the LV opening and the second bottom opening are combined and form a single LV / bottom opening.

47. Transformer house according to the preceding claim, wherein the transformer house comprises a second hatch (46) configured to removably cover at least a part of the LV opening.

48. Transformer house according to any of the preceding claims, comprising:a LV switchgear cabinet (52),LV connectors (48), wherein an end of an LV cable is connected to each LV connector, wherein the low voltage connectors are located in an upper portion of a LV cable entry compartment,LV bridge parts,wherein one end of each LV bridge part is connected to an LV connector (48), and wherein the opposite end of each LV bridge part is connected to the LV switchgear cabinet (52) in the LV switchgear cabinet compartment (16),a) and wherein each LV bridge part extends downward from the LV connector, extends underneath the transformer in the transformer compartment and extends upward to the LV switchgear cabinet, orb) wherein each LV bridge part extends over the transformer downward to the LS switchgear cabinet.

49. Transformer house according to preceding claim, comprising a second inner wall (4.2) which separates the LV switchgear cabinet compartment (16) from the transformer compartment (12), wherein the second inner wall has one or more openings at a lower portion thereof or does not extend fully to the floor, thereby creating a gap (520) between a lower end of the second inner wall and the floor, wherein the opening or gap allows passage of air and LV bridge parts between the LV switchgear cabinet compartment (16) and the transformer compartment (12).- 47 -50. Transformer house according to any of the two preceding claims, comprising a third wall (4.4) which acts as a heat shield and which separates the LS cable entry compartment (14) from the transformer compartment (12), wherein the transformer heat shield has one or more openings at a lower portion thereof or does not extend fully to the floor, thereby creating a gap (521) between a lower end of the third inner wall and the floor, wherein the opening or gap allows passage of air and LV bridge parts between the transformer compartment (12) and the LV cable entry compartment.

51. Transformer house according to any of the three preceding claims, wherein each LV connector is pivotably mounted, wherein each LV connector is pivotable about a horizontal axis between a use position in which the LV connector is preferably upright and an access position, which is preferably pivoted forward and more preferably horizontal, and in which access position the LV bridge part is accessible for an operator.

52. Transformer house according to any of claims 48-51, comprising a dedicated Public Service (PS) switchgear cabinet compartment (18), wherein a plurality of PS cables (98, 95) are connected to the PS switchgear cabinet (96) for maintenance and servicing by PS technicians53. Transformer house according to any claims 48-52, comprising a PS cable termination point (127) facilitating the connection to a solo PS cable (95), terminated in the PS switchgear cabinet compartment (18), or to the in the LV cable (50) integrated PS cables (98), terminating in the LV cable entry compartment (14) and connected to the PS switchgear cabinet (96) via the PS connector (94) and PS bridge parts (126).

54. Transformer house according to the preceding claim, wherein the public service switchgear cabinet compartment (18) is located on a same side (102) of the transformer house as the MV cable entry compartment and the LV cable entry compartment and is located between the MV cable entry compartment and the LV cable entry compartment.

55. Transformer house according to any claims 48-54, comprising a public service (PS) switchgear cabinet compartment (18) which is configured as a PS cable entry compartment and comprises a PS common lower opening () at a lower portion thereof, and wherein the transformer house comprises multiple PS cables which enter the PS switchgear cabinet compartment (18) via said PS common lower opening, wherein said PS common lower opening is not sealed and allows entry of groundwater.- 48 -56. Transformer house according to the preceding claim, comprising more than one MV cable entry compartment (6) and more than one LV cable entry compartment (14), wherein the public service switchgear cabinet (96) is located on a same, operator side (103) of the transformer house as the LV switchgear cabinet (52) and the MV switchgear cabinet (28) and is located between the LV switchgear cabinet (52) and the MV switchgear cabinet (28).

57. Transformer house according to the preceding claim, wherein the PS connectors and the PS switchgear cabinet are accommodated in separate compartments.

58. Transformer house according to the preceding claim, comprising a PS switchgear cabinet compartment (18) which accommodates the PS switchgear cabinet.

59. Transformer house according to any of claims 48-58, wherein the public service switchgear cabinet compartment is located on a same side (102) of the transformer as the LV cable entry compartment, and in particular situated between the LV cable entry compartment and the middle voltage cable entry compartment.

60. Transformer house according to any of claims 48-59, comprising one or more removable panels (34) configured for removably covering at least a part of the MV opening (30) and / or the LV opening (92) and or the PS opening.

61. T ransformer house according to any of the two preceding claims, wherein an upper end of each removable panel comprises a step (156) and a lower end of each removable panel comprises a mating skirt (158), allowing stacking of removable panels by each time letting the skirt of an upper panel mate with the step of a lower panel.

62. Transformer house according to any of claims 60-62, comprising a left post (132) and a right post (134) for each of the MV opening and LV opening, wherein the left and right post have a tongue or a groove (42a, 42b), and wherein each panel comprises a left side (160) and a right side (162) which have the other of the tongue or groove, allowing the removable panels to slide up and down in order to close off the MV opening and LV opening and PS opening or to open the MV opening and LV opening and PS opening.

63. Transformer house according to any of claims 60-63, wherein when seen in front view each panel has a rectangular contour with rounded corners, allowing the panels to be rotated relative to the posts about a horizontal rotation axis which is orthogonal to a front surface (104) of the panel, wherein rotation of the panel from a substantially- 49 -horizontal orientation over the removal angle to an inclined or vertical orientation allows for removal of said at least one or more removable panels from the MV opening or LV opening.

64. Transformer house according to any of claims 60-64, wherein an upper portion of the MV opening and / or LV opening and / or PS opening is covered by respectively the first or second hatch, and wherein a lower portion of the MV opening and / or LV opening and / or PS opening is covered by one or more removable panels.

65. Transformer house according to any of the preceding claims 60-64, comprising a left stop at the left post and a right stop at the right post, wherein the left and right stop are adjustable in height, wherein a lowest panel rests on the left and right stop, and wherein by adjusting the height of the left and right stop the height of the lowest removable panel can be adjusted.

66. Transformer house (10) comprising:- a house (5) having walls (7),- a transformer (20) positioned within the house,- at least an MV cable entry compartment (6) and an LV cable entry compartment (14) within the house,wherein the house comprises a MV opening (30) configured to provide access for an operator to the MV cable entry compartment and / or a LV opening (92) configured to provide access for an operator to the LV cable entry compartment,- one or more removable panels (34) configured for removably covering the MV opening and / or the LV opening and / or PS opening .

67. Transformer house according to claim 66, wherein an upper end of each removable panel comprises a step (156) and a lower end of each removable panel comprises a mating skirt (158), allowing stacking of removable panels by each time letting the skirt of an upper panel mate with the step of a lower panel.

68. Transformer house according to any of claims 66-67, comprising a left post (132) and a right post (134) for each of the MV opening and LV opening, wherein the left and right post have a groove or a tongue, and wherein each panel comprises a left side (160) and a right side (162) which have the other of the groove or tongue, allowing the removable panels to slide over a vertical distance relative to the left and right post.- 50 -69. Transformer house according to the preceding claim, wherein the groove or tongue of the left and right post do not extend over the full length of the left and right post.

70. Transformer house according to any of claims 66-69, wherein when seen in front view each panel has a rectangular contour with rounded corners, allowing the panels to be rotated relative to the posts about a horizontal rotation axis which is orthogonal to a front surface (104) of the panel, wherein rotation of the panel from a substantially horizontal orientation over the removal angle to an inclined or vertical orientation allows for removal of said at least one or more removable panels from the MV opening or LV opening.

71. Transformer house according to any of claims 66-70, wherein each removable panel comprises a centring notch (108) on an upper or lower end and a centring protrusion (110) on the other of the upper and lower end, wherein the centring notch of a first removable panel is configured to receive a centring protrusion of an adjoining removable panel, thereby aligning said removable panels with one another.

72. Transformer house (10) comprising:- a low voltage (LV) switchgear cabinet (52) configured for controlling and switching the LV current leaving the transformer house via LV cables (50),- an LV switchgear cabinet compartment (16) which accommodates the LV switchgear cabinet,- an LV cable entry compartment (14),- a number of LV-cables, wherein the LV cables enter the transformer house via the LV cable entry compartment, wherein the LV switchgear cabinet compartment and the LV cable entry compartment are separate, and- a cable bridge (136), wherein the cable bridge is configured to support and provide a path for the LV cables from the LV cable entry compartment to the LV switchgear cabinet compartment.

73. Transformer house according to the preceding claim, wherein the transformer house comprises a roof (112), wherein the cable bridge is located directly underneath the roof.

74. Transformer house (10), comprising:- a house (5) having walls (7),- a transformer (20) positioned within the house,- 51 -- a MV cable entry compartment (6) via which MV cables (26) enter the transformer house, and- a MV switchgear cabinet (28) configured for controlling and switching the MV current entering the transformer house via the MV cables and comprising a number of cabinet connectors (176),wherein each cabinet connector is configured to directly or indirectly connect to a MV cable, wherein the cabinet connectors are positioned at an upper rear side of the MV switchgear cabinet and wherein the cabinet connectors face the MV cable entry compartment.

75. Transformer house according to the preceding claim, wherein an end (24) of each MV cable (26) is connected to an associated MV connector (22) via a busbar coupling (25), wherein the busbar coupling in particular has a T-shape or an L-shape, wherein each MV connector (22) has a substantially horizontal orientation and wherein an end of each MV cable (26) is oriented substantially vertically, and wherein each busbar coupling connects the substantially vertically oriented cable end to the substantially horizontal cabinet connector (176).

76. Transformer house according to any of claims 74 - 75, comprising blow-out channels (179) adjacent the MV switchgear cabinet.

77. Middle voltage switchgear cabinet (28) configured for controlling and switching the middle voltage current entering the transformer house via the middle-voltage cables and comprising a number of cabinet connectors (176), wherein each cabinet connector (176) is configured to directly or indirectly connect to a middle voltage cable, wherein the cabinet connectors (176) are positioned at an upper rear side (177) of the middle voltage switchgear cabinet, and wherein the cabinet connectors are configured to face the middle voltage cable entry compartment (6) of a transformer house.

78. Middle voltage switchgear cabinet (28) according to the preceding claim, comprising a control panel on a forward side (181) which is opposite the rear side.

79. Transformer house comprising:- a house (5),- a transformer (20) positioned within the house,- middle voltage (MV) cables (26) which enter the transformer house,- a middle voltage (MV) switchgear cabinet (28) configured for controlling and switching the middle voltage current entering the transformer house,- 52 -wherein the transformer house (10) is located at least partially below ground level, and wherein the transformer (20) is located at least partially below ground level, wherein the transformer house has a rounded floor or a segmented floor which comprises a series of segments (330) which are straight but are oriented at an obtuse angle (a1) relative to one another, and wherein at least one MV cable or LV cable extends along said rounded or segmented floor underneath the transformer house from one side to an another, opposite side of the transformer house.

80. Transformer house according to the preceding claim, wherein the floor is rounded or comprises a series of segments in a plane which is orthogonal to a longitudinal direction and straight over at least a part of the floor in the longitudinal direction.

81. Transformer house according to the preceding claim, comprising piles, in particular four piles in a diamond configuration.

82. Roof element (350) configured to be installed on a roofless transformer house, the roof element comprising a horizontal section (351) and a skirt (352) which extends downwards from the horizontal section along a circumference of the horizontal section, wherein when seen in top view the skirt is rectangular and has four sides, wherein the skirt comprises ventilation openings in the skirt, wherein at least two sides of the skirt comprise a ventilation opening.

83. Roof element according to the preceding claim, wherein the horizontal section comprises an underside, and wherein the ventilation openings extend upward to the level of the underside of the horizontal section.

84. Roof element according to any of claims 82-83, comprising a further, inwardly placed skirt which is not at the circumference of the roof element and which isolates various transformer house compartments to such an extent that a natural flow of warm air between those compartments is obstructed.

85. Roof element according to the preceding claim, comprising at least one recess in the underside of the horizontal section, wherein the recess borders the skirt and wherein at least one ventilation opening is provided in the skirt which borders the recess and wherein at the recess the horizontal section has an underside which is higher than the underside of the horizontal section outside of the recess, and wherein the ventilation opening extends upward to at least the level of the underside of the horizontal section at the recess.- 53 -86. Method of exchanging a MV or LV bridge part (58), wherein the MV bridge part connects an MV connector (22) with an MV switchgear cabinet (28), wherein when seen in side view the MV bridge part extends downward from the MV connector and curves upward and enters the MV switch gear cabinet from a lower side, wherein the LV bridge part connects an LV connector with an LV switchgear cabinet (28), wherein when seen in side view the LV bridge part extends downward from the LV connector and curves upward and enters the LV switch gear cabinet from a lower side,the method comprising:- pivoting the MV or LV connector about a substantially horizontal pivot axis from a use position (118) to an access position (120) in which an operator can access the associated bridge part,- uncoupling the MV or LV bridge part from the MV or LV connector,- uncoupling the MV or LV bridge part from the MV or LV switchgear cabinet, - removing the MV or LV bridge part,- coupling a new MV or LV bridge part to the MV or LV connector,- coupling the new MV or LV bridge part to the MV or LV switchgear cabinet, - pivoting the MV or LV connector from the access position to the use position.

87. Cable and duct frame (401) for connecting multiple cables and ducts to a structure of a transformer house, the cable and duct frame comprising:two mounting plates (402),an upper cable clamp beam (403) configured to support multiple cable clamps (406),a lower connection profile (405) configured to support multiple duct clamps (407),wherein the upper cable clamp beam and the lower connection profile extend between the two mounting plates, wherein the lower connection profile is at a distance below the upper cable clamp beam, andmultiple cable clamps (406) supported by the upper cable clamp beam, multiple duct clamps (407) supported by the lower connection profile.

88. Cable and duct frame (401) according to the preceding claim, wherein the duct clamps are removable.- 54 -89. Cable and duct frame according to any of claims 87-88, wherein each duct clamp comprises a stop (411) configured to engage an end of a duct and configured to prevent the duct from moving upward.

Images