Gas detector relay device

Abstract

The invention relates to devices for protecting oil-filled equipment fitted with gas detector relays for protective purposes. The claimed device comprises a housing having an inlet and an outlet which are in communication with a tank and an expansion tank, via which the relay is filled with oil, and a reactive contact unit comprising a sealed oil-tight cylinder having magnetic contact mechanisms thereinside. The device further comprises an upper float and a lower float with built-in magnets. Said floats have protruding elements mounted on surfaces thereof. A first group of protruding elements is mounted on the top of the upper float to form a gap between the top of the float and the housing of the relay when said float is in a top position. A second group of protruding elements is mounted on the side surface of the floats to form a gap between the oil-tight cylinder, the side surface of the floats and the surfaces of guides for the up / down movement of the floats. The columns of oil insulation fluid between the surfaces have an increased insulation layer thickness and are delimited by the height dimensions of the gaps formed by the protruding elements. The technical result consists in more reliable and stable operation of the floats of a gas detector relay.

Description

[0001] Gas relay device

[0002] This technical solution relates to the electric power industry, in particular to protection devices for oil-filled electrical apparatus and equipment, such as oil-filled transformers, autotransformers and reactors, for which domestically produced gas relays of the RGT series, namely RGT 50 and RGT 80, are used as protection.

[0003] Gas relays are manufactured in our country and are widely used in electric power plants, which requires modernization and the need to introduce our own innovations in the current conditions of import substitution.

[0004] LEVEL OF TECHNOLOGY

[0005] A prior art device known as an analog is the utility model (RU Patent No. 117232, published June 20, 2012) "OIL-FILLED ELECTRICAL APPARATUS PROTECTION RELAY." The solution consists of reducing manufacturing labor and ensuring the maintainability of the oil-filled electrical apparatus protection relay by using an approach whereby the least sensitive reed switch is sufficient and selecting the device's sensitivity as an element of the relay's magnetic contact mechanism. A potential drawback is the circumvention of the quality and sensitivity of the floats, which serve as the moving element in the relay's magnetic contact mechanism, which is affected by the quality of the oil medium in which the floats can move, float, and accumulated interference during prolonged operation of the gas relay.

[0006] The next analogue is the device "PROTECTION RELAY FOR OIL-FILLED ELECTRIC APPARATUS" (RU Patent for Invention No. 2103777, published on January 27, 1998). A simplification of the device of the protection relay for oil-filled electrical apparatus is provided. In this case, the displaced float can only be fixed by a rod made, for example, with a non-circular cross-section. The problem of the inter-boundary space between surfaces in oil is not addressed, and no attention is paid to the quality and stability of the float movement in the environment during an emergency and its development. Which is a disadvantage. The utility model "PROTECTION RELAY FOR OIL-FILLED ELECTRIC APPARATUS" (patent for utility model No. 211939, published on June 29) was chosen as the closest analogue.2022), in which, during operation of a structurally simple relay, the friction forces of its moving parts, namely the floats, are reduced by constructing each float with hollow elements, ensuring a shift in its center of gravity, at which the moment of force pushing the float is equal to the moment of force of the permanent magnet relative to the center of gravity. This can reduce friction. The analysis of this technical solution does not take into account the presence of a small gap, as demonstrated in Figures 1, 2, and 3 of the current utility model, which exist between the side surfaces of the floats and the surfaces along which the float moves. Moreover, the float can move downward due to the generation of gases during an accident or an oil leak, and, as the situation develops, it can descend solely under the force of gravity, without the effective participation of oil insulation as a medium for the float's floating as the oil level drops.This ultimately leads to a reduction in the calculated response time, a slower response of the contact-reacting unit, and delayed actuation. Furthermore, between the surface plane of the upper float's upper end and the housing surface, a harmful condition arises, leading to adhesion of these surfaces due to a small gap and layering due to deterioration of the oil quality due to aging. This can lead to a temporary delay in the float's downward movement and even jamming between the surfaces, while the response time is critical.

[0007] The identified design impediments arising during the operation of the gas relay device include surface sticking, surface friction due to layering, and a small gap between the surfaces necessary for proper float buoyancy. Environmental impediments are those affecting the relay's performance due to deterioration of the oil during aging and long-term operation. This manifests itself as layering, thickening, and contamination of the float surfaces, the relay housing, between the guide surfaces, and the sealed oil-tight cylinder. This leads to a reduction in the already small gaps between the surfaces and a decrease in the buoyancy of the moving parts, namely the floats. These identified deficiencies must be mitigated or eliminated through new technical solutions.

[0008] DISCLOSURE OF THE INVENTION

[0009] The overall objective and goal of this technical solution is to improve the reliability and stability of the gas relay's contact-responsive float operation. The technical result is:

[0010] — increasing the reliability and stability of the operation of the contact responsive device of the gas relay;

[0011] — increasing the speed and response of the contact block responding at the early stage of an accident;

[0012] — maintaining a stable quality of float buoyancy and high sensitivity of the float response of the contact-responsive unit during long-term operation of the gas relay;

[0013] — elimination and reduction of structural interference and environmental interference in the gas contact responsive relay unit.

[0014] The technical result is achieved by the fact that a gas relay device has been developed, which contains a housing with an input and an output, communicating with a tank and an expansion tank, through which the relay is filled with oil and a contact responsive unit, containing a sealed oil-tight cylinder, with magnetic contact mechanisms inside, upper and lower floats with built-in magnets, guides in the form of rods for moving the floats up / down along the surfaces of these guides and a sealed oil-tight cylinder, and a pressure plate with a magnet, while protruding elements are installed on the surface of the floats so thatthat the first group of protruding elements is installed on the upper end of the upper float to create a gap between the section of the surface of the relay housing and the plane of the surface of the upper end of the upper float when the float is in the upper position, and the second group of protruding elements is installed on sections of the side surfaces of the floats to create a gap between the side surfaces of the floats and the surfaces of the guides and to create a gap between the side surfaces of the floats and the sealed oil-tight cylinder, wherein the columns of liquid of the oil insulation between the surfaces are made with the dimensions of the thickness of the layers of oil insulation between the surfaces and are limited by increased dimensions of the gaps with a value equal to the size of the height of the protruding elements and with the possibility of floating of the floats in the oil insulation environment.

[0015] The protruding elements of the first group can be made on the plane of the end of the float, preferably with a height to increase the gap between the surfaces by a value of 3 to 5 mm, and at the same time the protruding elements can be installed mainly in the central section of the end plane with a convex shape and with an area at the base of 0.25 to 1 square cm of the protruding element, and at the same time no more than 5 protruding elements can be installed on the end. The protruding elements of the first and second groups can be secured on the end and on the side surface of the float with a threaded connection or can be glued or can be structurally manufactured during shaping, casting the float as a whole product together with the protruding elements.

[0016] The protruding elements of the second group can be made in the form of projections and executed on sections of the side surface of the float from the side of the guide surface and from the side of the surface of the sealed oil-tight cylinder, while preferably from 3 to 15 protruding elements can be installed to allow for an increase in the gap size from 3 to 8 mm for each side of the float with an area from 0.15 to 1 cm square at the base of the protruding element.

[0017] 3 rows of 3 protruding elements can be installed in a row with indents between these protruding elements, or when installing 12 protruding elements, 4 rows of 3 protruding elements in each row can be installed accordingly.

[0018] The protruding elements of the first group and the second group can be made of a durable and elastic material, and for the second group, the middle row of protruding elements can be larger in height than the upper and lower rows, or the outer protruding elements of all rows can be larger in height than the protruding elements within the rows.

[0019] The protruding elements of the first and second groups can be made in a streamlined shape.

[0020] Synthetic liquid insulation, liquid dielectric, synthetic oil can be used as oil insulation.

[0021] BRIEF DESCRIPTION OF DRAWINGS

[0022] The essence of the technical solution is explained by figures.

[0023] Fig. 1 schematically shows the general appearance of the gas relay device and the involved parts of the contact responsive unit.

[0024] Fig. 2 shows a schematic view from above:

[0025] The section of the block is a contact responsive one, the upper float with protruding elements of the first group on the upper end of the float and with protruding elements of the second group on the side surfaces of the float

[0026] Fig. 3 schematically depicts a protruding element mounted on the float surface for the first group of elements, with the height of the protruding element indicated. Fig. 3 is also suitable for illustrating the height and appearance of the protruding elements for the second group.

[0027] The figures are indicated by numbers.

[0028] 1 - cylinder of the contact reacting block

[0029] 2 - upper and lower floats

[0030] 3- guides for each float

[0031] 4 - section of the surface of the gas relay housing (highlighted by a thickened section)

[0032] 5- protruding elements of the first group

[0033] 6 - contact block, responsive, indicated within the vertical dashed lines (the main parts used in this technical solution)

[0034] 7 - protruding elements of the second group

[0035] 8 - the base of the protruding element (highlighted by a thickened segment)

[0036] 9- the top of the protruding element

[0037] The input and output of the gas relay are indicated by the contour arrows in Figure 1.

[0038] The height is taken to be the size of the protruding element of the float from the base (8) to the top (9), which is shown in Fig. 3 and designated by the letter B.

[0039] In this text, oil, oil medium and oil insulation are terminologically presented as the same thing.

[0040] ESSENCE OF THE INVENTION

[0041] Below, the essence and preferred design of the gas relay device are explained using figures.

[0042] According to this technical solution, the housing has an inlet and an outlet (shown by contour arrows in Fig. 1), which are connected to the tank and the expansion tank (not shown in the figures), a contact responsive unit (designated as pos. 6 in Fig. 1). The contact responsive unit contains a sealed oil-tight cylinder (1) with magnetic contact mechanisms inside (not shown in the figures), upper and lower floats (2) with built-in magnets (not shown in the figures), guides (3), a pressure plate with a magnet (not shown in the figures). Protruding elements in the form of projections (5) and (7) are installed on the surface of the floats (Fig. 2).

[0043] The first group of protruding elements (5) is introduced into the gas relay device and installed on the upper end of the upper float (2) to create a gap between the surface section of the relay housing (4) and the plane of the surface of the upper end of the upper float (2) when the float is in the upper position.

[0044] This gap increases the clearance between the surfaces, eliminating the possibility of adhesion between closely spaced surfaces, which can accumulate oil components such as hydrocarbons, resins, and sulfur compounds during prolonged operation. This adhesion resulted in unnecessary delays at the onset of an accident, resulting in the separation of the surfaces, and a loss of time and reduced response time for the contact-response unit (6). Eliminating this interference improves the reliability and stability of operation, as well as the speed and response time of the contact-response unit (6) at an early stage of an accident.

[0045] A second group of protruding elements (7) (Fig. 2) is introduced into the gas relay device on the sections of the side surfaces of the floats (2) to create a gap between the side surfaces of the floats (2) and the surfaces of the guides (3) and to create a gap between the side surfaces of the floats and the sealed oil-tight cylinder (1), while the columns of oil insulation are made with the dimensions of the thickness of the layers of oil insulation between the surfaces and are limited by the established dimensions of the gaps. The resulting thickness of the layer of oil insulation between the specified surfaces does not create friction between the sections of the plane of the float and the surfaces of the guide and the sealed oil-tight cylinder. But this friction transfers only into the thickness of this layer when the float moves up or down at the onset of an emergency.Contact between the surfaces occurs only at the points of contact with the protruding elements of the second group (7), significantly reducing the contact area of ​​these surfaces and reducing friction in these areas between the surfaces. This helps maintain stable buoyancy of the floats (2) and the high sensitivity of the floats (2) of the contact-responsive unit (6) during long-term operation of the gas relay, while eliminating and reducing structural and environmental interference in the contact-responsive unit (6) of the gas relay device.

[0046] During installation, the protruding elements of the first and second groups (5,7) (Fig. 2,3) can be secured to the end and side surfaces of the float (2), respectively, using a threaded connection. They can also be glued. They can be structurally manufactured during shaping or casting of the float (2) as a single piece together with the protruding elements (5,7), which will ensure smooth transitions of the float surface and a solid external shape without joints and seams on which oil aging and oxidation products could accumulate and layer during long-term operation. The protruding elements of the first and second groups (5,7) can be made in a streamlined shape, which will also ensure that oil contamination does not accumulate on the surface of the products and that buoyancy is maintained.

[0047] The protruding elements of the first group (5) can be made on the plane of the end of the float (2), preferably with a height to increase the gap between the surfaces by a value of 3 to 5 mm, and in this case the protruding elements are installed mainly in the central section of the end plane with a convex shape, and in this case no more than 5 protruding elements (5) can be installed on the end. This ensures a reliable gap between the surfaces.

[0048] The protruding elements of the second group (7) can be made in the form of projections and executed on the sections of the side surface of the float from the side of the guide surface and from the side of the surface of the sealed oil-tight cylinder, wherein it is possible to install predominantly from 3 to 15 protruding elements (7) with an increase in the gap size from 3 to 8 mm for each side of the float with a base area from 0.15 to 1 cm square at the base of the protruding element (7) and so that 3 protruding elements (7) can be installed in a row with placement along the middle horizontal line of the float with indents between these protruding elements (7) or when installing 12 protruding elements (7), 4 rows of 3 protruding elements (7) in each row can be installed accordingly.

[0049] The protruding elements of the first group and the second group (5.7) can be made of durable and elastic material.

[0050] Moreover, for the second group (7), the middle rows of protruding elements may be taller than the top and bottom rows. The outermost protruding elements (7) of all rows may be taller than the protruding elements (7) within the rows.

[0051] All the above proposed design solutions allow for increasing the gap between surfaces for high-quality and long-term operation of the parts of the contact responsive unit (6) of the gas relay device.

[0052] IMPLEMENTATION OF THE INVENTION

[0053] The proposed technical solution can be implemented as follows

[0054] In the gas relay device, the upper float (2) is equipped with protruding elements of the first and second groups (5, 7), the lower float (2) is equipped with protruding elements of the second group. (7) On the end surface of the upper float (2) protruding elements (5) with a height of 5 mm are made. When the relay chamber is filled with oil, the upper float rises together with the oil level to the initial upper position. At the same time, on the sides, where the protruding elements of the second group (7) are installed, between the lateral surface of the float (2) and the surfaces of the guide (3) and the sealed oil-tight cylinder (1), a gap is formed according to the size of the height of these elements of 5 mm, which is filled with oil in the form of an oil column between the surfaces.The float (2) can rise under the action of the Archimedes buoyancy force without frictional obstacles between the said surfaces and without delays to the upper position against the section of the housing until the abutment of the tops (9) of the protruding elements (5) is established, ensuring sufficient clearance without contact and adhesion of the surfaces. The lower float (2) is equipped with protruding elements of the second group (7). The lower float (2) with the introduction of protruding elements has a high-quality sensitivity of response to a rise in the oil level and is set to the upper initial position. The thickness of the oil column layer on the sides of the floats (2) and between the surfaces of the guide (3) and the sealed oil-tight cylinder (1) is set so that sliding friction occurs within the thickness of the oil layer, and not between the surfaces, which ensures a sensitive response to changes in the oil level.When the oil level in the relay chamber drops, the upper float (2) drops and the contact warning system is activated. If the oil level continues to drop, the lower float (2) drops and the contact shutdown system is activated. Both floats (2) meet the required buoyancy and oil level response conditions in the surrounding oil environment.

[0055] For the operated RGT 50 and RGT 80, floats (2) with an end surface area of ​​15 sq. cm are used. On this end, it will be possible to install 5 protruding elements (5) of the first group, one of which in the center with a base area of ​​1 sq. cm, and the remaining four with a base area of ​​0.25 sq. cm. These protruding elements can be installed in the central section of the end with indents from each other by 1 cm. This will ensure a reliable stop with the vertices (9), small sections of the areas of the vertices (9) at the upper position of the upper float (2) to the section of the housing (4). The total contact area of ​​the vertices (9) of the protruding elements (5) to the section of the housing (4) will be no more than 1.5 sq. cm, which will ensure reliable protection against sticking of the surfaces and, in connection with this, the speed of response of the float as a movable mechanism of the contact responsive unit (6). The protruding elements of the second group (7) can be installed on each side of the float and in a row of 3 elements for 4 rows.A total of 12 protruding elements can be installed on the side, with the outermost protruding elements in a row having a height of 7 mm and a base area of ​​1 sq cm, and within the rows having a height of 5 mm and a base area of ​​0.5 sq cm. This will ensure a reliable gap between the surfaces and an oil column at least 4 mm thick. This will reliably protect against friction, which could impede the movement of the floats (2), and from contact between the said surfaces. This will also create high-quality buoyancy for the floats (2), which facilitates sensitivity and rapid response to oil level changes.

[0056] It's possible that synthetic liquid insulation, liquid dielectric, or synthetic oil could be used as oil insulation. This would significantly reduce environmental interference, as synthetic oil is less susceptible to aging and deterioration over long periods of use.

[0057] Below are a number of examples that can be used to implement the standard sizes of protruding elements.

[0058] Example 1. The protruding elements of the first group can be placed closer to the periphery of the end face, with the exception of the central protruding element. The height of such elements will be reduced by the size of the protruding fasteners that the protruding element may touch with its tip. If the central protruding element is 5 mm high, the protruding element at the periphery will be 2-3 mm smaller.

[0059] Example 2. The protruding elements of the second group (5) can be placed in a minimum or maximum quantity from 3 protruding elements along the centerline of the float to 15. With three elements, one row of three of these protruding elements will be formed with a height of 5 mm and a base area of ​​0.5 sq. cm. And with a quantity of 15 elements in a row there can be 3 elements and 5 rows, or in a row there can be 5 elements and 3 rows. Example 3. The protruding elements of the second group (7) can be placed 3 in one row and in three rows. A total of 9 protruding elements on each side of the side surface of the float (2).

[0060] Example 4. The protruding elements of the second group (7) can be placed with different heights. The outer protruding elements in a row have a greater height than the inner ones.

[0061] These examples clearly demonstrate the possible use of protruding elements (5,7) to implement a technical solution within a range of values ​​for the height and number of protruding elements (5,7) of the float (2) with increasing clearances. The shape of the protruding elements can range from rectangular to smooth and streamlined. In this case, a streamlined shape is preferred.

[0062] Testing the contact responsive unit (6) on a mockup yielded positive results, revealing the potential for increasing the gap to increase the thickness of the oil column between the surfaces by using the protruding elements (7) of the second group. This improved the float's buoyancy and eliminated the possibility of surface friction.

[0063] For the protruding elements of the first group, the test was carried out to increase the gap from 3 to 5 mm, which eliminates the adhesion of surfaces and increases the clearance between surfaces.

[0064] This technical solution can be applied in production conditions during the manufacture of RGT 50 and RGT 80.

[0065] The introduction of protruding elements of the first and second groups into the gas relay design increases the gap between the surfaces and, in order to increase the thickness of the oil layer (oil insulation), between the surfaces of the floats on the sides and the guides, the sealed oil-tight cylinder, and the clearance between the relay housing and the upper float. This ensures reliable and stable operation of the gas relay during long-term operation, in the event of an early failure, and when the lower float is triggered to shut off.

[0066] The combination of essential features of this technical solution ensures the implementation and achievement of the stated technical results.

Claims

Invention formula 1. A gas relay device characterized by the fact that it contains a housing with an input and an output communicating with a tank and an expansion tank, through which the relay is filled with oil and a responsive contact unit containing a sealed oil-tight cylinder with magnetic contact mechanisms inside, upper and lower floats with built-in magnets, guides in the form of rods for moving the floats up and down along the surfaces of these guides and the sealed oil-tight cylinder, and a pressure plate with a magnet, while protruding elements are installed on the surface of the floats so thatthat the first group of protruding elements is installed on the upper end of the upper float to create a gap between the section of the surface of the relay housing and the plane of the surface of the upper end of the upper float when the float is in the upper position, and the second group of protruding elements is installed on sections of the side surfaces of the floats to create a gap between the side surfaces of the floats and the surfaces of the guides and to create a gap between the side surfaces of the floats and the sealed oil-tight cylinder, wherein the columns of liquid of the oil insulation between the surfaces are made with the dimensions of the thickness of the layers of oil insulation between the surfaces and are limited by increased dimensions of the gaps with a value equal to the size of the height of the protruding elements and with the possibility of floating of the floats in the oil insulation environment.

2. The gas relay device according to paragraph 1, characterized in that the protruding elements of the first group can be made on the plane of the end of the float, preferably with a height to increase the gap between the surfaces by an amount from 3 to 5 mm, and at the same time the protruding elements can be installed mainly in the central section of the end plane with a convex shape and with an area at the base from 0.25 to 1 square cm of the protruding element, and at the same time no more than 5 protruding elements can be installed on the end 3. A gas relay device according to paragraph 1, characterized in that the protruding elements of the first and second groups can be secured, respectively, to the end and side surfaces of the float by a threaded connection or can be glued or can be structurally manufactured during shaping or casting of the float as a single product together with the protruding elements.

4. The gas relay device according to paragraph 1, characterized in that the protruding elements of the second group can be made in the form of projections and are made on sections of the side surface of the float from the side of the guide surface and from the side of the surface of the sealed oil-tight cylinder, wherein it is possible to install mainly from 3 to 15 protruding elements to be able to increase the gap by a size of from 3 to 8 mm for each side of the float with an area of ​​from 0.15 to 1 cm square at the base of the protruding element and so that 3 rows of 3 protruding elements can be installed in a row with indents between these protruding elements or, when installing 12 protruding elements, 4 rows of 3 protruding elements in each row can be installed accordingly.

5. A gas relay device according to paragraph 1, characterized in that the protruding elements of the first group and the second group can be made of a strong and elastic material, and for the second group, the middle rows of protruding elements can be larger in height than the upper and lower rows, or the outer protruding elements of all rows can be larger in height than the protruding elements within the rows.

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