A gas relay testing device

Abstract

This invention discloses a gas relay calibration device, relating to the field of gas relay technology. It includes: an oil storage tank connected in series with a gas relay via an oil supply pipe; the gas relay and an oil supply branch pipe connected in parallel; an air inlet pipe and a pressurizing mechanism installed on the oil supply pipe; an oil drain trough connected to an oil storage chamber below the gas relay; a return oil pump connected to the oil storage tank installed in the oil storage chamber; and an oil drain pipe installed on the oil supply pipe above the oil drain trough. This invention, through the oil supply branch pipe connected in parallel with the gas relay, can simulate the working state of the gas relay at the moment of a transformer fault during actual use, thus making the calibration of the gas relay more accurate. Simultaneously, the pressurization operation is simple, and the transformer oil is recycled during use, improving resource utilization and preventing transformer oil leakage that could affect environmental hygiene.

Description

Technical Field

[0001] This invention relates to the field of gas relay technology, and more specifically to a gas relay calibration device. Background Technology

[0002] A gas relay (also known as a gas safety relay) is a protective device used in transformers. It is installed in the pipeline between the transformer's oil conservator and oil tank. When an internal fault in the transformer causes the oil to decompose and produce gas or causes an oil flow surge, the contacts of the gas relay will activate, connecting the designated control circuit and promptly issuing an alarm signal (light gas signal) or activating protective components to automatically disconnect the transformer (heavy gas signal).

[0003] The quality of the gas relay itself determines the safety of the entire transformer operation, so gas relay calibration is an essential calibration item in the power industry.

[0004] Traditional gas relay calibration is often a gradual process, involving continuous adjustments and pushing. However, the actual working state of a gas relay is often a sudden, instantaneous action. Therefore, the calibration process cannot accurately reflect the actual working state, resulting in certain deviations. The consequences of inaccurate calibration results are serious, causing property damage and posing significant safety hazards.

[0005] In addition, traditional gas relay calibration often suffers from serious oil pollution, which has an impact on the environment. Summary of the Invention

[0006] The purpose of this invention is to provide a gas relay calibration device to solve the problem that existing calibration devices cannot accurately reflect the actual operating conditions during the calibration process.

[0007] To achieve the above objectives, the present invention adopts the following technical solution: a gas relay calibration device, comprising an oil tank and a gas relay, wherein the oil tank is connected in series with the gas relay through an oil supply pipe, the gas relay is connected in parallel with the oil supply branch pipe, and an air inlet pipe and a pressurization mechanism are installed on the oil supply pipe.

[0008] The gas relay is provided with an oil drain trough connected to the oil storage chamber. An oil return pump is installed in the oil storage chamber and connected to the oil storage tank. An oil drain pipe is installed on the oil delivery pipe located above the oil drain trough.

[0009] Furthermore, the gas relay calibration device also includes a bracket, the bracket having a base plate inside, which together with the left side plate, the right side plate and the upper support plate form an upper cavity;

[0010] An oil storage tank is installed on the upper support plate, and the oil storage tank and the oil pipeline form a loop;

[0011] An oil delivery branch pipe is installed on the oil delivery pipeline, and a control valve A is installed on the oil delivery branch pipe. The oil delivery branch pipe and the oil storage tank form a circuit.

[0012] A control valve C is installed on the oil pipeline located on the left side of the oil pipeline branch. Two parallel mounting flanges A are provided on the left side of the control valve C. A gas relay is installed through the two mounting flanges A.

[0013] The mounting flange A and the gas relay are located in the upper cavity.

[0014] This invention, through an oil supply branch pipe connected in parallel with the gas relay, can simulate the working state of the gas relay at the moment a transformer fault occurs during actual use.

[0015] Furthermore, the oil pipeline is connected to the air intake pipe on the right side of the oil pipeline branch pipe, and the air intake pipe extends below the oil pipeline and a check valve is installed on it.

[0016] Furthermore, a pressurizing mechanism is installed on the oil supply pipe between the air intake pipe and the oil supply branch pipe, and a control valve B is installed on the oil supply pipe between the pressurizing mechanism and the air intake pipe.

[0017] Furthermore, a pressure gauge is installed on the oil supply pipe to the left of the gas relay, and a control valve D is installed on the oil supply pipe to the left of the pressure gauge.

[0018] Furthermore, an oil pump, an oil flow regulating valve, and an oil flow meter are installed on the oil pipeline;

[0019] Or / and, the air inlet pipe is connected to the air pump, and a gas flow regulating valve and a gas flow meter are installed on the air inlet pipe.

[0020] Furthermore, the pressurizing mechanism includes an adjusting cylinder, a cover, an adjusting screw, and a piston. The adjusting cylinder is connected to the cover, and the cover has a vent hole. The cover is threadedly connected to the adjusting screw, and a handle located outside the adjusting cylinder is connected to the adjusting screw. A connecting ball located inside the adjusting cylinder is provided below the adjusting screw. A piston is provided inside the adjusting cylinder, and a connecting sleeve is provided on the piston. The connecting sleeve cooperates with the connecting ball.

[0021] Furthermore, the bracket located below the base plate forms a lower cavity, which is the oil storage cavity. An oil draining groove is provided on the base plate between the two mounting flanges A. The bottom of the oil draining groove has an oil draining hole, which is connected to the oil storage cavity. An oil collection groove is provided at the oil inlet of the return oil pump. The return oil pump is connected to the return oil pipe, and the return oil pipe is connected to the oil storage tank.

[0022] Furthermore, an oil drain valve is installed on the oil drain pipe.

[0023] Furthermore, the oil storage tank is provided with an oil filling port, an exhaust port on the top of the tank, and a liquid level viewing window on one side of the tank.

[0024] Furthermore, the gas relay is connected to the mounting flange A via mounting flange B. An open cup is provided in the gas relay, and a magnet B is fixedly connected to the right side of the open cup. The magnet B cooperates with a single reed switch. At the same time, a movable baffle is provided in the gas relay, and a magnet A is installed on the movable baffle. A double reed switch is provided to cooperate with the magnet A.

[0025] The beneficial effects of this invention are as follows: By using an oil supply branch pipe connected in parallel with the gas relay, this invention can simulate the working state of the gas relay at the moment a transformer malfunctions during actual use, thus making the verification of the gas relay more accurate; at the same time, the pressurization operation is simple, and the transformer oil can be recycled during use, improving resource utilization and preventing transformer oil leakage that would affect environmental hygiene. Attached Figure Description

[0026] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0027] Figure 1 This is a schematic diagram of the overall structure of the present invention;

[0028] Figure 2 This is the present invention. Figure 1 Enlarged view of the central pressurization mechanism;

[0029] Figure 3 This is a schematic diagram of the gas relay of the present invention;

[0030] Figure 4 This is a schematic diagram of the internal structure of the gas relay of the present invention.

[0031] The names corresponding to each mark in the diagram:

[0032] 1. Bracket; 11. Upper support plate; 12. Left side plate; 13. Base plate; 131. Oil drain trough; 132. Oil drain hole; 14. Right side plate; 2. Oil storage tank; 21. Oil filling port; 22. Vent hole; 23. Liquid level window; 3. Oil storage chamber; 31. Return oil pump; 32. Oil collection trough; 33. Return oil pipe; 4. Air pump; 41. Air inlet pipe; 42. Gas flow regulating valve; 43. Gas flow meter; 44. Check valve; 5. Oil transfer pump; 51. Oil transfer pipe; 511. Oil transfer branch pipe; 512. Control valve A; 52. Oil flow regulating valve; 53. Oil flow meter; 54. Control valve B; 55. Control valve C; 56. Mounting flange A; 57. Pressure gauge; 58. Control valve D; 59. Oil drain pipe; 591. Oil drain valve; 6. Control panel; 61. Oil pump switch; 62. Air pump switch; 63. Return oil pump switch; 7. Pressurization mechanism; 71. Cover; 711. Vent hole; 72. Adjusting cylinder; 73. Adjusting screw; 731. Handle; 732. Connecting ball; 74. Piston; 741. Connecting sleeve; 8. Gas relay; 81. Mounting flange B; 82. Movable baffle; 821. Double reed switch; 822. Magnet A; 83. Open cup; 831. Magnet B; 832. Single reed switch. Detailed Implementation

[0033] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0034] This embodiment provides a gas relay calibration device, such as Figure 1 As shown, the gas relay calibration device includes a support 1, within which a base plate 13 is provided. The base plate 13, together with the left side plate 12, the right side plate 14, and the upper support plate 11, forms an upper cavity. The support 1 located below the base plate 13 forms a lower cavity, which is the oil storage chamber 3.

[0035] An oil drain trough 131 is provided on the base plate 13, and an oil drain hole 132 is opened at the bottom of the oil drain trough 131. The oil drain hole 132 is connected to the oil storage chamber 3. A return oil pump 31 is installed in the oil storage chamber 3. An oil collection trough 32 is provided at the inlet of the return oil pump 31. The return oil pump 31 is connected to the oil storage tank 2 on the upper support plate 11 through the return oil pipe 33. An oil delivery pipe 51 is provided at the bottom right side of the oil storage tank 2. An oil delivery pump 5, an oil flow regulating valve 52, and an oil flow meter 53 are installed sequentially on the oil delivery pipe 51. At the same time, a control valve B54, a pressurizing mechanism 7, a control valve C55, a mounting flange A56, and a control valve D58 are also installed on the oil delivery pipe 51. A gas relay 8 is installed through two parallel mounting flanges A56. A pressurizing mechanism 7 is installed on the oil delivery pipe 51 located to the left of the control valve B54. An oil delivery branch pipe 511 is connected to the oil delivery pipe 51 located to the left of the pressurizing mechanism 7. The left end of 11 is connected to the oil supply pipe 51. A control valve A512 is installed on the oil supply branch pipe 511. A pressure gauge 57 is installed on the oil supply pipe 51 to the right of the control valve D58. The pressure gauge 57 cooperates with the pressurizing mechanism 7. On the right side of the control valve D58, above the oil drain tank 131, an oil drain pipe 59 is also set. The oil drain pipe 59 is connected to the oil supply pipe 51. An oil drain valve 591 is installed on the oil drain pipe 59. An air pump 4 is also installed on the upper support plate 11. The air pump 4 is connected to the air inlet pipe 41. A gas flow regulating valve 42, a gas flow meter 43, and a check valve 44 are installed on the air inlet pipe 41. The air inlet pipe 41 extends to the bottom of the oil supply pipe 51 and is connected to the oil supply pipe 51. A control panel 6 is also set on the upper support plate 11. The control panel 6 is equipped with an oil pump switch 61 connected to the oil supply pump 5, an air pump switch 62 connected to the air pump 4, and a return oil pump switch 63 connected to the return oil pump 31.

[0036] The oil storage tank 2 is provided with an oil filling port 21, an exhaust port 22 on the top of the tank body, and a liquid level viewing window 23 on one side of the tank body.

[0037] The two mounting flanges A56, the pressurizing mechanism 7, and the gas relay 8 are located in the upper cavity.

[0038] like Figure 2 As shown, the pressurizing mechanism 7 consists of an adjusting cylinder 72, a cover 71, an adjusting screw 73, and a piston 74. The adjusting cylinder 72 is connected to the cover 71. A vent hole 711 is opened on the cover 71, and the adjusting screw 73 is threadedly connected to the cover 71. A connecting ball 732 is provided at the end of the adjusting screw 73, and the connecting ball 732 is connected to the connecting sleeve 741 on the piston 74.

[0039] like Figure 3 As shown, the gas relay 8 is connected to the mounting flange A56 via mounting flange B81.

[0040] like Figure 4As shown, an open cup 83 is provided in the gas relay 8, and a magnet B831 is fixedly connected to the right side of the open cup 83. The magnet B831 cooperates with a single reed switch 832. At the same time, a movable baffle 82 is provided in the gas relay 8, and a magnet A822 is installed on the movable baffle 82. A double reed switch 821 is provided to cooperate with the magnet A822.

[0041] The steps for using this invention are as follows: Check whether each pipe and valve is functioning properly, then add an appropriate amount of transformer oil to the oil storage tank 2. The oil temperature should be greater than 20°C. If the oil temperature is insufficient, an auxiliary heating device can be used, which will not be elaborated here. During the process, observe and judge the liquid level according to the liquid level window 23 on the oil storage tank 2. At this time, adjust the piston 74 in the pressurizing mechanism 7 to the lowest end, and install the gas relay into the oil pipeline 51 through the mounting flange. Open all valves in the pipeline (except for the drain valve 591). At this time, start the oil pump 5, and adjust the appropriate flow rate through the oil flow regulating valve 52 to fill the entire device pipeline with transformer oil. During the process, the oil flow rate is 0.3m / s to 0.8m / s. During the pipeline filling process, adjust the pressurizing mechanism 7 so that its piston 74 rises to the highest point.

[0042] After the pipeline is filled with transformer oil, close control valve C55, then start air pump 4, adjust gas flow control valve 42 to adjust the appropriate gas flow rate, and record the gas flow rate value Q1m after the gas flow rate stabilizes. 3 / s, close control valve A512 and quickly open control valve C55, start the stopwatch to start timing until the gas relay 8 sends a light gas signal. At this time, the gas gathers above the gas relay 8 and forces the oil level in the gas relay 8 to drop. The drop in the oil level will cause the open cup 83 to drop accordingly. When the open cup 83 drops to a certain extent, the magnet B831 contacts the reed switch 832, so the circuit is connected and a light gas signal is sent. Record the time t at this time. The total gas flow rate during the process is Q = Q1·t (m³ / s). 3 Observe whether the total gas volume meets the relevant standards, that is, the gas relay 8 has a reliable signal within the gas volume setting range of 250ml~300ml. When the gas relay 8 has no signal during the process, it can be adjusted by the counterweight in the gas relay 8. Since this is existing technology, it will not be described in detail. Repeat the experiment multiple times until the gas relay 8 has a stable and reliable signal within the gas volume setting range. During the verification process, the transformer oil in the pipeline needs to be drained through the drain pipe before the gas relay can be opened for adjustment. After the adjustment is completed, repeat the above steps and verify repeatedly.

[0043] After the light gas signal verification of gas relay 8 is completed, the air pump 4 is turned off. At this time, control valve C55 is closed and control valve A512 is opened. The oil pump 5 is started and the transformer oil flow rate is adjusted through the oil flow regulating valve 52. After the flow rate stabilizes, control valve A512 is closed and control valve C55 is quickly opened. Observe whether gas relay 8 has a heavy gas signal. The process simulates the actual use of gas relay. The instantaneous impact method is more realistic and obtains more reliable verification data, which helps to improve the accuracy of the test. When the oil flow rate exceeds the set value, the movable baffle 82 moves forward under the impact of the oil, so that the magnet A821 on it contacts the double reed switch 822, and the circuit connection is activated. When the gas relay is activated, a heavy gas signal is emitted. During this process, the set value of the transformer oil flow rate for the heavy gas signal is generally different depending on the specification of the gas relay. Taking the QJ-25 type as an example, but not limited to QJ-25, its flow rate set value is 1m / s. When the oil flow rate exceeds 1m / s, the gas relay 8 should have a reliable heavy gas signal output. When the oil flow rate exceeds the flow rate set value and the gas relay 8 does not have a stable signal output, it is necessary to adjust it through the internal spring of the gas relay. Since this is an existing feature, it will not be elaborated here. After adjustment, repeated tests are conducted to ensure that the gas relay 8 has a stable signal output when the flow rate set value is exceeded. During the adjustment process, the transformer oil in the pipeline should also be drained in advance.

[0044] After the light and heavy gas signals of gas relay 8 are verified, close control valves B54, A512, and D58, and simultaneously open control valve C55. At this time, rotate the handle 731 of the pressurizing mechanism 7 to make the pressure of pressure gauge 57 0.25 MPa, and maintain it for 20~60 minutes, recording the pressure change. At the same time, observe that there should be no leakage at the gas relay 8's vent valve, bellows, outlet terminal, and all sealing points of the housing. After the pressure is stabilized, remove the relay core and check that there are no signs of leakage at the reed contacts. It is important to note that the probe cover must be tightened and the pressure removed before opening the cover to check for leakage in the bellows. Since this is an existing standard, it will not be elaborated further here.

[0045] At this point, the gas relay 8 test is complete. Disconnect the power supply and close the oil flow regulating valve. Then open control valves A, B, C, and D, and then open the drain valve 591 on the drain pipe 59 to drain a portion of the transformer oil. Finally, remove the gas relay from the pipe. Note that the drain valve 591 does not need to be opened during the test; otherwise, the device will not be airtight, and the test cannot be completed. However, if the gas relay 8 does not respond stably during the test and adjustment is needed, a portion of the transformer oil in the pipe must be drained before opening the gas relay 8; otherwise, oil splashing may occur.

[0046] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, and not to limit them; although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features; and these modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A gas relay calibration device, comprising an oil tank (2) and a gas relay (8), characterized in that, The oil storage tank (2) is connected in series with a gas relay (8) through an oil supply pipe (51). The gas relay (8) is connected in parallel with the oil supply branch pipe (511). An air inlet pipe (41) and a pressurization mechanism (7) are installed on the oil supply pipe (51). The gas relay (8) is provided with an oil drain trough (131) connected to the oil storage chamber (3). The oil storage chamber (3) is equipped with a return oil pump (31) connected to the oil storage tank (2). An oil drain pipe (59) is installed on the oil delivery pipe located above the oil drain trough. The pressurizing mechanism (7) includes an adjusting cylinder (72), a cover (71), an adjusting screw (73), and a piston (74). The adjusting cylinder (72) is connected to the cover (71). A vent hole (711) is opened on the cover (71). The cover (71) is threadedly connected to the adjusting screw (73). A handle (731) located outside the adjusting cylinder (72) is connected to the adjusting screw (73). A connecting ball (732) located inside the adjusting cylinder (72) is provided below the adjusting screw (73). A piston (74) is provided inside the adjusting cylinder (72). A connecting sleeve (741) is provided on the piston (74). The connecting sleeve (741) cooperates with the connecting ball (732). An oil supply branch pipe (511) is installed on the oil supply pipe (51), and a control valve A (512) is installed on the oil supply branch pipe (511). The oil supply branch pipe (511) and the oil storage tank (2) form a circuit. A control valve C (55) is installed on the oil supply pipe (51) located to the left of the oil supply branch pipe (511). An air inlet pipe (41) is connected to an air pump (4). An oil supply pump (5), an oil flow regulating valve (52), and an oil flow meter (53) are installed on the oil supply pipe (51). After the gas relay (8) completes the light gas signal verification, the air pump (4) is turned off, the control valve C (55) is turned off and the control valve A (512) is turned on. The oil supply pump (5) is started and the transformer oil flow rate is adjusted through the oil flow regulating valve (52). After the flow rate stabilizes, the control valve A (512) is turned off and the control valve C (55) is turned on quickly to simulate the actual use process of the gas relay.

2. The gas relay calibration device according to claim 1, characterized in that: It also includes a bracket (1), which has a base plate (13) inside. The base plate (13), together with the left side plate (12), the right side plate (14) and the upper support plate (11), forms an upper cavity. An oil storage tank (2) is provided on the upper support plate (11), and the oil storage tank (2) and the oil pipeline (51) form a circuit; two parallel mounting flanges A (56) are provided on the left side of the control valve C (55), and a gas relay (8) is installed through the two mounting flanges A (56); The mounting flange A (56) and the gas relay (8) are located in the upper cavity.

3. The gas relay calibration device according to claim 2, characterized in that: The oil pipeline (51) is connected to the air inlet pipe (41) on the right side of the oil branch pipe (511). The air inlet pipe (41) extends to the bottom of the oil pipeline (51) and a check valve (44) is installed on it.

4. A gas relay calibration device according to claim 3, characterized in that: A pressurizing mechanism (7) is installed on the oil supply pipe (51) between the air intake pipe (41) and the oil supply branch pipe (511), and a control valve B (54) is installed on the oil supply pipe (51) between the pressurizing mechanism (7) and the air intake pipe (41).

5. A gas relay calibration device according to claim 2, characterized in that: A pressure gauge (57) is installed on the oil supply pipe (51) to the left of the gas relay (8), and a control valve D (58) is installed on the oil supply pipe (51) to the left of the pressure gauge (57).

6. A gas relay calibration device according to claim 3, characterized in that: A gas flow regulating valve (42) and a gas flow meter (43) are installed on the air inlet pipe (41).

7. A gas relay calibration device according to claim 2, characterized in that: The bracket (1) located below the base plate (13) forms a lower cavity, which is the oil storage cavity (3). An oil drain trough (131) is provided on the base plate (13) located between the two mounting flanges A (56). An oil drain hole (132) is provided at the bottom of the oil drain trough (131). The oil drain hole (132) is connected to the oil storage cavity (3). An oil collection trough (32) is provided at the oil inlet of the return oil pump (31). The return oil pump (31) is connected to the return oil pipe (33). The return oil pipe (33) is connected to the oil storage tank (2).

8. A gas relay calibration device according to claim 7, characterized in that: The oil storage tank (2) is provided with an oil filling port (21), an exhaust port (22) is provided on the top of the tank, and a liquid level window (23) is provided on one side of the tank.

9. A gas relay calibration device according to claim 2, characterized in that: The gas relay (8) is connected to the mounting flange A (56) via mounting flange B (81). An open cup (83) is provided in the gas relay (8), and a magnet B (831) is fixedly connected to the right side of the open cup (83). The magnet B (831) cooperates with a single reed switch (832). At the same time, a movable baffle (82) is provided in the gas relay (8), and a magnet A (822) is installed on the movable baffle (82). A double reed switch (821) is provided to cooperate with the magnet A (822).

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