Rapid cable head rod type distribution transformer and method

Abstract

The invention relates to a quick cable head rod type distribution transformer and a method. The quick cable head rod type distribution transformer comprises a transformer main body, a quick lead, a lengthened two-way sleeve, a two-position high-voltage load switch unit and a fully-sealed oil tank with a finned radiator, the quick lead comprises a high-voltage single-core cable, an elbow-shaped cable head, an outdoor cold shrinkage terminal and a quick cold pressing joint, one end of the high-voltage single-core cable is connected with the lengthened two-way sleeve through the elbow-shaped cable head, and the other end of the high-voltage single-core cable is connected with the quick cold pressing joint through the outdoor cold shrinkage terminal; the two-position high-voltage load switch unit is of an oil chamber structure, one end of the two-position high-voltage load switch unit is connected with the lengthened two-way sleeve through a high-voltage cable, the other end of the two-position high-voltage load switch unit is provided with a high-voltage quick interface, and a two-position load switch is arranged inside the two-position high-voltage load switch unit. Compared with the prior art, rapid replacement of a power grid product and a traditional common porcelain bushing can be completed, an emergency power supply can be rapidly connected, and the power supply reliability is improved.

Description

Technical Field

[0001] The invention relates to the field of transformers, and in particular to a quick-type cable head-pole distribution transformer and a method. Background Art

[0002] In the early days of the domestic power grid, the pole-type 10kV oil-immersed distribution transformers were generally high voltage transformers with porcelain bushings and M12 copper terminal piles. With the development of the power grid, transformers are gradually being promoted and applied with new energy-efficient elbow-type high-voltage cable head structures. If the early ordinary bushing-type transformers running in the power grid fail, they cannot be quickly replaced with transformers with existing elbow-type cable heads, and on-site installation workers are required to make and install the leads, which results in a long time, irregular installation, and great influence from the external environment.

[0003] Also, if there is a problem with the overhead high voltage line, other means of high voltage power input cannot be used quickly.

[0004] Therefore, there is an urgent need to provide a quick cable distribution transformer that can quickly replace high-voltage outgoing line structures of different structural forms according to the operation of the power grid, thereby improving the reliability of safe operation of the power grid. Summary of the invention

[0005] The purpose of the present invention is to overcome the defects of the above-mentioned prior art and provide a quick cable head type distribution transformer and method, which can complete the rapid replacement of power grid products with traditional ordinary porcelain sleeves; and can also form high-voltage emergency power supply access through a two-position high-voltage load switch unit.

[0006] The purpose of the present invention can be achieved by the following technical solutions:

[0007] A quick-type cable head pole type distribution transformer comprises a transformer body, quick-type lead wires, an extended double-pass bushing, a two-position high-voltage load switch unit and a fully sealed oil tank with a plate-type radiator;

[0008] The quick lead includes a high-voltage single-core cable, an elbow-type cable head, an outdoor cold shrink terminal and a quick cold press joint. One end of the high-voltage single-core cable is connected to the extended double-pass bushing through the elbow-type cable head, and the other end is connected to the quick cold press joint through the outdoor cold shrink terminal, which is used to connect the high-voltage cable of the power grid through the quick cold press joint;

[0009] One input end of the extended double-pass bushing is connected to a quick lead, the other input end is connected to the two-position high-voltage load switch unit through a high-voltage cable, and the output end is connected to the transformer body;

[0010] The two-position high-voltage load switch unit is an oil chamber structure, one end of which is connected to a high-voltage cable, and the other end is provided with a high-voltage quick interface, and a two-position load switch is provided inside. The high-voltage cable is connected to the high-voltage quick interface through the two-position load switch, and the high-voltage quick interface is used to connect the emergency power supply;

[0011] The fully sealed oil tank with the fin-type radiator is installed outside the transformer body.

[0012] Furthermore, the quick cold-pressed joint is a cold-pressed reducer-type connecting copper joint, which is used to form a connection with the grid high-voltage cable at the grid end by cold pressing.

[0013] Furthermore, the quick cold compression joint is vertically connected to the outdoor cold shrink terminal, and the corresponding connection point is insulated.

[0014] Furthermore, the length of the quick lead is less than 2 m and is fixed by a fixed lead unit.

[0015] Furthermore, the fixed lead unit includes a cable bracket, a grounding lead and a fixed angle steel, one end of the grounding lead is connected to the quick lead, and the other end is connected to the cable bracket, the quick lead is fixed by the cable bracket, and the cable bracket is fixed to the transformer body by the fixed angle steel.

[0016] Furthermore, the high-voltage cable in the two-position high-voltage load switch unit is connected to the extended double-pass bushing through an elbow-type cable head.

[0017] Furthermore, the fully sealed oil tank with a fin-type radiator comprises an oil tank body with a fully enclosed structure and a fin-type radiator structure fixed to a side wall of the oil tank body.

[0018] Furthermore, an anti-ultraviolet terminal box is provided above the extended double-pass bushing and has a flat structure.

[0019] Furthermore, the extended double-pass bushing is also connected to a lightning arrester.

[0020] The present invention also provides a method for using the quick-type cable head pole type distribution transformer as described above, comprising the following steps:

[0021] When installing the quick-type cable head pole type distribution transformer, after assembling the transformer body, the quick cold-pressed connector of the quick lead is connected to the grid high-voltage cable at the grid end by cold pressing to realize the operation of the transformer body;

[0022] During the operation of the transformer body, if one end connected to the high-voltage cable of the power grid is abnormal, first disconnect the two-position load switch in the two-position high-voltage load switch unit, then connect the emergency power supply to the high-voltage quick interface, and after ensuring that the end connected to the high-voltage cable of the power grid is disconnected, connect the two-position load switch to supply power to the transformer body through the emergency power supply.

[0023] Compared with the prior art, the present invention has the following advantages:

[0024] (1) The quick cable head pole distribution transformer provided by the present invention can be quickly connected to the grid high-voltage cable at the grid end through the quick cold-pressed joint in the quick lead, so as to quickly replace the grid product with the traditional ordinary porcelain bushing, and is equipped with an elbow-type cable head to connect the extended double-pass bushing. When the transformer fails, it can be quickly replaced with the existing elbow-type cable head transformer.

[0025] (2) The present invention sets up a two-position high-voltage load switch unit, reserves a high-voltage emergency input port, and the input mode is more flexible, which can realize the multifunctional and rapid access of the high-voltage power supply mode and improve the power supply reliability.

[0026] (3) The quick-type cable head pole distribution transformer of the present invention can be fixedly installed and can be pre-tested for integration in the factory. Its structure is flexible and extensible, and can be flexibly and reliably installed with overhead lines.

[0027] (4) The transformer oil tank of the present invention adopts a plate-type radiator, which can effectively reduce the temperature impact due to the presence of an air layer.

[0028] (5) An anti-ultraviolet terminal box can be installed on the top of the transformer of the present invention to prevent long-term ultraviolet radiation and bird nest formation. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] Figure 1 It is a schematic diagram of the main structure of a quick-type cable head pole type distribution transformer provided in an embodiment of the present invention;

[0030] Figure 2 It is a left-side structural schematic diagram of a quick-type cable head pole type distribution transformer provided in an embodiment of the present invention;

[0031] Figure 3 A schematic diagram of the structure of a quick lead provided in an embodiment of the present invention;

[0032] Figure 4 A schematic diagram of the front view of the installation state structure of a quick lead provided in an embodiment of the present invention;

[0033] Figure 5 It is a left schematic diagram of the installation state structure of a quick lead provided in an embodiment of the present invention;

[0034] Figure 6 It is a schematic diagram of the installation state of an extended double-pass sleeve provided in an embodiment of the present invention;

[0035] Figure 7 A schematic structural diagram of a two-position high-voltage load switch unit provided in an embodiment of the present invention;

[0036] In the figure, 1. quick lead, 2. extended double-pass bushing, 3. two-position high-voltage load switch unit, 4. fully sealed oil tank, 5. quick cold-pressed connector, 6. outdoor cold-shrink terminal, 7. high-voltage single-core cable, 8. elbow-type cable head, 9. ground lead, 10. two-position load switch, 11. high-voltage quick interface. DETAILED DESCRIPTION

[0037] In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Generally, the components of the embodiments of the present invention described and shown in the drawings here can be arranged and designed in various different configurations.

[0038] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the invention claimed for protection, but merely represents selected embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0039] It should be noted that similar reference numerals and letters denote similar items in the following drawings, and therefore, once an item is defined in one drawing, further definition and explanation thereof is not required in subsequent drawings.

[0040] In the description of the present invention, it should be noted that the terms "center", "up", "down", "left", "right", "vertical", "horizontal", "inside", "outside", etc. indicate directions or positional relationships based on the directions or positional relationships shown in the accompanying drawings, or are the directions or positional relationships in which the inventive product is usually placed when in use. They are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific direction, be constructed and operated in a specific direction, and therefore should not be understood as a limitation on the present invention.

[0041] It should be noted that the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include one or more of the features. In the description of this application, the meaning of "plurality" is two or more, unless otherwise clearly and specifically defined.

[0042] In addition, the terms "horizontal", "vertical" and the like do not mean that the components are required to be absolutely horizontal or suspended, but can be slightly tilted. For example, "horizontal" only means that its direction is more horizontal than "vertical", and does not mean that the structure must be completely horizontal, but can be slightly tilted.

[0043] Example 1

[0044] like Figure 1 and Figure 2 As shown, this embodiment provides a quick-type cable head pole type distribution transformer, including a transformer body, a quick lead 1, an extended double-pass bushing 2, a two-position high-voltage load switch unit 3 and a fully sealed oil tank 4 with a plate-type radiator;

[0045] like Figure 3 As shown, the quick lead 1 includes a high-voltage single-core cable 7, an elbow-type cable head 8, an outdoor cold shrink terminal 6 and a quick cold press joint 5. One end of the high-voltage single-core cable 7 is connected to the extended double-pass bushing 2 through the elbow-type cable head 8, and the other end is connected to the quick cold press joint 5 through the outdoor cold shrink terminal 6, which is used to connect the high-voltage cable of the power grid through the quick cold press joint 5;

[0046] One input end of the extended double-pass bushing 2 is connected to the quick lead 1, the other input end is connected to the two-position high-voltage load switch unit 3 through a high-voltage cable, and the output end is connected to the transformer body;

[0047] like Figure 7 As shown, the two-position high-voltage load switch unit 3 is an oil chamber structure, one end of which is connected to a high-voltage cable, and the other end is provided with a high-voltage quick interface 11, and a two-position load switch 10 is provided inside. The high-voltage cable passes through the two-position load switch 10 and is connected to the high-voltage quick interface 11, and the high-voltage quick interface 11 is used to connect the emergency power supply;

[0048] A fully sealed oil tank 4 with a fin-type radiator is installed outside the transformer body.

[0049] Specifically, Figure 4 and Figure 5As shown, one end of the quick lead 1 with an elbow-type cable head 8 is connected to the extended double-pass bushing 2, and the other end is a quick cold-pressed joint 5, which is quickly connected to the high-voltage power grid cable at the power grid end by cold-pressing, and needs to be vertically connected to the outdoor cold-shrink terminal 6 to prevent bending stress. The connection needs to be insulated. The quick cold-pressed joint 5 can be a cold-pressed reducer-type connecting copper joint.

[0050] The quick lead 1 has a length of less than 2 m and is fixed by a fixed lead unit.

[0051] The fixed lead unit includes a cable bracket, a grounding lead 9 and a fixed angle steel. One end of the grounding lead 9 is connected to the quick lead 1, and the other end is connected to the cable bracket. The quick lead 1 is fixed by the cable bracket, and the cable bracket is fixed to the transformer body through the fixed angle steel.

[0052] The ground lead 9 is connected to the cable support to prevent movement under stress. At the same time, the cable support should be set to make the bending radius of the quick lead 1 large enough to prevent stress at the connection.

[0053] The setting of the fixed lead unit can realize the reliability, tensile resistance and wind resistance of the connection line between the transformer and the line.

[0054] like Figure 6 As shown, the extended double-pass bushing 2 can realize the protection of the transformer and can choose two types of line entry methods:

[0055] One input terminal is connected to the quick lead 1, and the other input terminal is connected to the two-position high-voltage load switch unit 3 through a high-voltage cable;

[0056] One end of the high-voltage cable in the two-position high-voltage load switch unit 3 is an elbow-type cable head 8, and the other end is a high-voltage quick interface 11, and an oil-immersed two-position load switch 10 is arranged inside.

[0057] The fully sealed oil tank 4 with a fin radiator includes a fully enclosed oil tank body and a fin radiator structure fixed to the side wall of the oil tank body, which effectively dissipates heat for the cables running on the top. The fully sealed oil tank 4 has an air gap of about 100 mm from the top of the box cover of the transformer body, and is filled with transformer oil.

[0058] Preferably, an anti-ultraviolet terminal box is provided above the extended double-pass bushing 2, and has a flat structure facing outward to prevent the formation of bird nests.

[0059] Preferably, the extended double-pass bushing 2 is also connected to a lightning arrester.

[0060] Preferably, the quick-type cable head pole distribution transformer can be installed in the factory and realize integrated testing, adding high-voltage lead partial discharge measurement and monitoring, and transformer overall lightning impulse assessment.

[0061] Example 2

[0062] This embodiment also provides a method for using a quick-type cable head pole type distribution transformer as in Embodiment 1, comprising the following steps:

[0063] When installing the quick-type cable head pole type distribution transformer, after assembling the transformer body, the quick cold-pressed connector 5 of the quick lead 1 is connected to the grid high-voltage cable at the grid end by cold pressing to realize the operation of the transformer body. At this time, the two-position load switch 10 is preferably kept in the disconnected state;

[0064] During the operation of the transformer body, if an abnormality occurs at one end connected to the high-voltage cable of the power grid, first ensure that the two-position load switch 10 in the two-position high-voltage load switch unit 3 is disconnected, and then connect the emergency power supply to the high-voltage quick interface 11. After ensuring that the end connected to the high-voltage cable of the power grid is disconnected, connect the two-position load switch 10 to power the transformer body through the emergency power supply.

[0065] This is equivalent to when an abnormality occurs at one end of the pole-mounted quick-type cable head pole-mounted distribution transformer connected to the overhead line, the power can be input through the emergency power supply to ensure continuous power supply to the transformer load. When connecting to the emergency power supply or other external power supply, the two-position load switch 10 in the oil of the two-position high-voltage load switch unit 3 must be disconnected first; after the external power supply completes the connection of the high-voltage quick interface 11 and ensures that the other quick lead 1 is disconnected, the two-position load switch 10 in the oil can be connected to supply power to the quick-type cable head pole-mounted distribution transformer.

[0066] The preferred specific embodiments of the present invention are described in detail above. It should be understood that a person skilled in the art can make many modifications and changes based on the concept of the present invention without creative work. Therefore, any technical solution that can be obtained by a person skilled in the art through logical analysis, reasoning or limited experiments based on the concept of the present invention on the basis of the prior art should be within the scope of protection determined by the claims.

Claims

1. A quick-type cable head type distribution transformer, comprising a transformer body, characterized in that: It also includes a quick lead (1), an extended double-pass bushing (2), a two-position high-voltage load switch unit (3) and a fully sealed oil tank (4) with a fin-type radiator; The quick lead (1) comprises a high-voltage single-core cable (7), an elbow-type cable head (8), an outdoor cold shrink terminal (6) and a quick cold press joint (5); one end of the high-voltage single-core cable (7) is connected to the extended double-pass bushing (2) via the elbow-type cable head (8), and the other end is connected to the quick cold press joint (5) via the outdoor cold shrink terminal (6), and is used to connect the high-voltage cable of the power grid via the quick cold press joint (5); One input end of the extended double-pass bushing (2) is connected to a quick lead (1), the other input end is connected to the two-position high-voltage load switch unit (3) via a high-voltage cable, and the output end is connected to a transformer body; The two-position high-voltage load switch unit (3) is an oil chamber structure, one end of which is connected to a high-voltage cable, and the other end is provided with a high-voltage quick interface (11), and a two-position load switch (10) is provided inside, the high-voltage cable is connected to the high-voltage quick interface (11) through the two-position load switch (10), and the high-voltage quick interface (11) is used to connect an emergency power supply; The fully sealed oil tank (4) with a fin-type radiator is installed outside the transformer body.

2. A quick-type cable head pole distribution transformer according to claim 1, characterized in that: The quick cold-pressed joint (5) is a cold-pressed reducer-type connecting copper joint, which is used to form a connection with the high-voltage power grid cable at the power grid end by cold-pressing.

3. The quick-type cable head pole distribution transformer according to claim 1 is characterized in that: The quick cold-pressed joint (5) is vertically connected to the outdoor cold-shrink terminal (6), and the corresponding connection points are insulated.

4. The quick-type cable head pole distribution transformer according to claim 1 is characterized in that: The quick lead (1) has a length of less than 2 m and is fixed by a fixed lead unit.

5. A quick-type cable head pole distribution transformer according to claim 4, characterized in that: The fixed lead unit comprises a cable support, a grounding lead (9) and a fixed angle steel, one end of the grounding lead (9) is connected to a quick lead (1), and the other end is connected to the cable support, the quick lead (1) is fixed by the cable support, and the cable support is fixed to the transformer body by the fixed angle steel.

6. The quick-type cable head pole distribution transformer according to claim 1 is characterized in that: The high-voltage cable in the two-position high-voltage load switch unit (3) is connected to the extended double-pass bushing (2) via an elbow-type cable head (8).

7. The quick-type cable head pole distribution transformer according to claim 1 is characterized in that: The fully sealed oil tank (4) with a fin radiator comprises an oil tank body with a fully sealed structure and a fin radiator structure fixed to the side wall of the oil tank body.

8. The quick-type cable head pole distribution transformer according to claim 1 is characterized in that: An anti-ultraviolet terminal box is arranged above the extended double-pass bushing (2) and has a flat structure.

9. The quick-type cable head pole distribution transformer according to claim 1 is characterized in that: The extended double-pass bushing (2) is also connected to a lightning arrester.

10. A method for using a quick-type cable head pole distribution transformer as claimed in claims 1 to 9, characterized in that: The following steps are involved: When installing the quick-type cable head pole type distribution transformer, after assembling the transformer body, the quick cold-pressed connector (5) of the quick lead (1) is connected to the high-voltage power grid cable at the power grid end by cold-pressing to realize the operation of the transformer body; During the operation of the transformer main body, if an abnormality occurs at one end connected to the high-voltage cable of the power grid, the two-position load switch (10) in the two-position high-voltage load switch unit (3) is first disconnected, and then the emergency power supply is connected to the high-voltage quick interface (11), and after ensuring that the end connected to the high-voltage cable of the power grid is disconnected, the two-position load switch (10) is connected to supply power to the transformer main body through the emergency power supply.

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