A gas relay calibration device

Abstract

The present invention provides a gas relay calibration device, comprising a pusher, the fixed end of the pusher is connected to a connecting part through a support assembly, the connecting part is connected to a screw at the bottom of a gas relay probe, and a through hole is provided in the middle of the connecting part to allow the telescopic end of the pusher to pass through; the telescopic end of the pusher is connected to a sensing plate, the fixed end of the pusher is connected to a photoelectric sensor, and the photoelectric sensor is used to send a signal that the pusher returns to zero position when the sensing plate blocks the photoelectric sensor; the contacts of the photoelectric sensor, the pusher and the gas relay are all connected to a motor driver, and the motor driver is also connected to a processor, and the motor driver is used to collect the signal that the pusher returns to zero position, to drive the pusher to extend and retract, and to feedback the propulsion stroke of the pusher when the contact is actuated. The present invention starts with the probe position, measures the position of the probe at the moment when the contact of the gas relay is actuated, and analyzes the operating status of the tested device through the position.

Description

Technical Field

[0001] The invention relates to the technical field of electric power safety, and in particular to a gas relay calibration device. Background Art

[0002] The gas relay is a protective device used in transformers. It is installed in the pipeline between the oil pillow and the oil pipe of the transformer. When the internal fault of the transformer causes the oil to decompose and produce gas or causes the oil flow to surge, the contacts of the gas relay are activated, the designated control circuit is connected, and a signal alarm is issued in time (light gas) or the protective element is activated to automatically cut off the transformer (heavy gas). The gas relay includes an upper floating ball for monitoring the gas volume, a lower floating ball for monitoring the oil level of the transformer, a baffle for monitoring the oil flow, and a test probe.

[0003] The current calibration items of gas relays include appearance inspection, insulation resistance test, withstand voltage test, sealing test, flow rate setting value and gas volume test. The flow rate setting value and gas volume test require the gas relay to be disassembled and carried out on a special test bench. The gas relay has been tested during shipment and handover. With the increase of running time, the actual action value of the gas relay may deviate from the set value. Once the action set value is inaccurate, it may cause malfunction or refusal to operate of the gas relay contacts. Malfunction may cause abnormal shutdown of the transformer, and refusal to operate may expand the scope of the accident.

[0004] At present, when calibrating the gas relay, it is necessary to disassemble it from the transformer body and install it on a special gas calibration platform for calibration. The disassembly, installation, transportation, calibration and other processes all require a lot of manpower. The gas calibrator is bulky. At the same time, the current gas calibrators are bulky and most of them are laboratory equipment, which is not convenient to bring to the transformer site. The disassembled gas relay needs to be transported to a special laboratory. Summary of the invention

[0005] The object of the present invention is to provide a gas relay calibration device, which is small in size, light in weight, and easy to carry. The gas relay does not need to be disassembled during calibration. The position of the probe is measured at the moment when the contacts of the gas relay are actuated, and the operating state of the gas relay is analyzed through the position.

[0006] The technical solution of the present invention is:

[0007] A gas relay testing device, comprising:

[0008] Pushing member;

[0009] A connecting portion is connected to the fixed end of the pusher through a supporting assembly; the connecting portion is connected to a screw at the bottom of the gas relay probe, and a through hole is provided in the middle of the connecting portion to allow the telescopic end of the pusher to pass through;

[0010] A sensing plate connected to the telescopic end of the pushing member;

[0011] A photoelectric sensor connected to the fixed end of the pusher; the photoelectric sensor is used to send a signal indicating that the pusher has returned to zero position when the sensing plate covers the photoelectric sensor;

[0012] A motor driver, connected to the photoelectric sensor for collecting a signal indicating that the pusher has returned to zero position, connected to the pusher for driving the pusher to extend and retract, and connected to the contact of the gas relay for providing feedback on the propulsion stroke of the pusher relative to zero position when the contact is actuated;

[0013] The processor is connected to the motor driver for sending control signals thereto, and is also used to receive the zero position signal fed back by the motor driver, the current position signal of the pusher, and the propulsion stroke of the pusher when the gas relay contact is actuated.

[0014] The telescopic end of the pushing member is connected to the push rod, and the push rod is threadedly connected to the contact; a through hole is provided in the middle of the connecting portion to allow the contact to pass through.

[0015] A rod body is fixed at one end of the contact, and an external thread is provided on the outside of the rod body, which is threadedly connected to an internal thread provided at the end of the push rod; the threaded connection between the contact and the push rod is used to adjust the overall length of the contact and the push rod.

[0016] The above-mentioned connecting part includes a connecting cylinder, the inner side of which is provided with an internal thread, which is threadedly connected to the external thread of the screw at the bottom of the gas relay probe; a clamping disk coaxial with the connecting cylinder is fixedly connected to the top of the connecting cylinder, and through holes are provided in the middle of the clamping disk and the connecting cylinder to allow the above-mentioned push rod and the above-mentioned contact to pass through.

[0017] The side wall of the connecting portion clamping disc is provided with a toothed groove for facilitating manual rotation of the connecting portion so as to fasten the connecting portion with the screw at the bottom of the gas relay probe.

[0018] The induction plate is fixedly connected to the side wall of the push rod through an induction plate mounting block; the photoelectric sensor is fixed on a photoelectric sensor mounting plate, and the photoelectric sensor mounting plate is connected to the fixed end of the pusher.

[0019] The sensing plate is connected to the sensing plate mounting block sleeved and fixed on the side wall of the push rod through a first connecting component, and the first connecting component includes:

[0020] A first slide groove is provided on the sensing plate, and an extending direction of the first slide groove is the same as a pushing direction of the push rod;

[0021] A second locking nut, passing through the first sliding slot and fixedly connected to the sensor plate mounting block;

[0022] Among them, after tightening the second locking nut, the sensor plate is fixed on the sensor plate mounting block. After loosening the second locking nut, the first sliding groove opened on the sensor plate slides relative to the second locking nut to adjust the relative position between the sensor plate and the sensor plate mounting block.

[0023] The above-mentioned photoelectric sensor is connected to the photoelectric sensor mounting plate through a second connecting component, and the second connecting component includes:

[0024] A second slide groove is provided on the photoelectric sensor mounting plate, and an extending direction of the second slide groove is the same as a telescopic direction of the push rod;

[0025] a third locking nut, passing through the second sliding groove and fixedly connected to the photoelectric sensor;

[0026] Among them, after tightening the third locking nut, the photoelectric sensor is fixed on the photoelectric sensor mounting plate. After loosening the third locking nut, the photoelectric sensor and the third locking nut slide along the second slide groove to adjust the relative position between the photoelectric sensor and the photoelectric sensor mounting plate.

[0027] The above-mentioned supporting components include:

[0028] A first cover plate is fixed on the fixed end of the pusher, and a through hole is provided in the middle thereof for allowing the push rod to pass through; the first cover plate is also fixedly connected to the upper end of the photoelectric sensor mounting plate;

[0029] A second cover plate, wherein a through hole is provided in the middle thereof to match the connecting cylinder of the connecting part, and the connecting part's clamping disc is clamped on the surface of the second cover plate; the second cover plate is also fixedly connected to the lower end of the photoelectric sensor mounting plate;

[0030] Two connecting rods are parallel to the push rod and symmetrically placed on both sides of the push rod; one end of each connecting rod is fixedly connected to the first cover plate, and the other end of each connecting rod is fixedly connected to the second cover plate;

[0031] The locking block is a diamond-shaped structure as a whole, with a through hole in the middle of the diamond allowing the push rod to pass through, and the diameter of the through hole is smaller than the outer diameter of the clamping disc; a through hole is respectively provided on both sides of the diamond to cooperate with the connecting rod, and the two through holes are respectively sleeved on the side walls of the two connecting rods;

[0032] The locking screw passes through the through hole provided in the locking block and contacts the side wall of the connecting rod, so that the locking block presses the connecting part onto the second cover plate.

[0033] The processor is an industrial control computer, which is connected to the motor driver for sending control signals thereto, and is also used to receive a zero position signal fed back by the motor driver, a current position signal of the pusher, and a propulsion stroke of the pusher when the gas relay contact is actuated;

[0034] The industrial control computer is also connected to an input module, a recording module, and a display module; the input module is used to input the zero position signal of the pusher, the propulsion speed of the pusher, the maximum operating stroke of the pusher, and the opening and closing signals of the pusher; the recording module is used to record the current position of the pusher and the propulsion stroke data of the pusher when the gas relay contact is actuated; the display module is used to display the parameters input by the input module and the data recorded by the recording module.

[0035] Beneficial effects of the present invention:

[0036] The gas relay has been tested during the factory and handover process. As the running time increases, the actual action value of the gas relay may deviate from the set value. Once the action set value is inaccurate, it may cause the gas relay contact to malfunction or refuse to operate. The malfunction may cause the transformer to stop operating normally, and the refusal to operate may expand the scope of the accident. The present invention provides a gas relay calibration device, which starts from the probe position, measures the position of the probe at the time of contact action, and analyzes the operating status of the tested equipment from the position; at the same time, the gas relay calibration device has a small instrument size, light weight, and is easy to carry, and does not require disassembly of the secondary wiring in the gas relay junction box or the gas relay.

[0037] At present, when checking the gas relay, it needs to be disassembled from the transformer body and installed on a special gas checking platform before checking. Its disassembly, installation, transportation, and checking processes all require a lot of manpower. At the same time, the gas checker is bulky and mostly laboratory equipment. It is not convenient to bring it to the transformer site. The disassembled gas relay needs to be transported to a special laboratory. After disassembling the gas relay, the body and the oil pillow need to be connected as soon as possible. The site generally uses qualified gas relay spare parts to replace the gas relay that needs to be checked. It takes 2.5 hours for two skilled masters to disassemble and install the gas relay. The present invention develops a double-float action stroke measuring instrument for a gas relay. It does not need to disassemble the secondary wiring in the gas relay junction box or the gas relay. It can start from the probe position and complete the measurement of the double-float action stroke of the gas relay online. The measurement data can feedback the accuracy of the fixed value of the gas relay in a certain sense. BRIEF DESCRIPTION OF THE DRAWINGS

[0038] Figure 1 It is a schematic diagram of the overall structure of the present invention placed horizontally;

[0039] Figure 2 It is a schematic diagram of the overall structure of the present invention placed vertically;

[0040] Figure 3 It is a wiring diagram of the motor driver of the present invention;

[0041] Figure 4 This is a schematic diagram of the contact wiring of the gas relay of the present invention;

[0042] Figure 5 It is a schematic diagram of the structure of the push rod of the present invention;

[0043] Figure 6 This is a schematic diagram of the structure of a fixed rod body at one end of the contact of the present invention;

[0044] Figure 7 This is a schematic diagram of the structure of the sensor plate mounting block of the present invention;

[0045] Figure 8 It is a structural schematic diagram of the locking block of the present invention;

[0046] Fig. 9 It is a side structural schematic diagram of the locking block of the present invention;

[0047] Fig.10 It is a structural schematic diagram of the connecting portion of the present invention;

[0048] Fig.11 It is a schematic diagram of the contact of the present invention pushing the probe to move downward;

[0049] Fig.12 This is a schematic diagram of the display interface of the industrial control computer of the present invention;

[0050] Fig.13 A schematic diagram of the location of the gas relay probe of the present invention;

[0051] Fig.14 A schematic diagram showing the position of the screws at the bottom of the gas relay probe of the present invention;

[0052] Fig.15 A schematic diagram of the present invention installed on a gas relay;

[0053] Fig.16 The figure is a schematic diagram of the contact wiring of the gas relay of the present invention.

[0054] Description of reference numerals:

[0055] 1. First cover plate; 2. Connecting rod; 3. Push rod; 4. Contact; 5. Sensor plate mounting block; 6. Locking block; 7. Second cover plate; 8. Connecting part; 9. Sensor plate; 10. Photoelectric sensor mounting plate; 11. Photoelectric sensor; 12. Pushing member; 13. Motor driver; 14. Industrial computer; 15. First slide groove; 16. Second locking nut; 17. Second slide groove; 18. Third locking nut. DETAILED DESCRIPTION

[0056] Combine the following Figures 1 to 16 , a specific embodiment of the present invention is described in detail, but it should be understood that the protection scope of the present invention is not limited by the specific embodiment. Example

[0057] like Figure 1 and Figure 2 As shown, the present invention provides a gas relay testing device, including a pusher 12, the fixed end of the pusher 12 is connected to the connecting portion 8 through a supporting assembly, the connecting portion 8 is connected to the screw at the bottom of the gas relay probe, and a through hole is opened in the middle of the connecting portion 8 to allow the telescopic end of the pusher 12 to pass through; the telescopic end of the pusher 12 is connected to the induction plate 9, the fixed end of the pusher 12 is connected to the photoelectric sensor 11, and the photoelectric sensor 11 is used to send a signal that the pusher 12 returns to the zero position when the induction plate 9 blocks the photoelectric sensor 11; the pusher 12, the photoelectric sensor 11 and the contacts of the gas relay are all connected to the motor driver 13; as shown Figure 3 As shown, the motor driver 13 is connected to the photoelectric sensor 11 to collect the signal of the pusher 12 returning to the zero position, the motor driver 13 is connected to the pusher 12 to drive its extension and retraction, and the motor driver 13 is connected to the contact of the gas relay to feedback the propulsion stroke of the pusher 12 relative to the zero position when the contact is actuated. Figure 4 The motor driver 13 is also connected to a processor, which is used to send a control signal to the motor driver 13 and receive a zero position signal fed back by the motor driver 13, a current position signal of the pusher 12, and a propulsion stroke of the pusher 12 when the gas relay contact is actuated.

[0058] Furthermore, the pushing member 12 is a linear stepping motor.

[0059] The gas relay is a protective device used in transformers. It is installed in the pipe between the oil pillow and the oil tank of the transformer. It uses the internal fault of the transformer to generate gas or oil leakage in the body to force the oil level in the gas relay to drop, or causes the oil flow from the body to surge into the oil pillow, so that the contacts of the gas relay are activated, the designated control circuit is connected, and the alarm signal is issued in time or the protection element is activated to automatically cut off the transformer.

[0060] The gas relay is equipped with an upper float, a lower float, a baffle and a test mechanical probe. The upper float monitors the gas volume of light gas. When the upper float moves, the light gas contact is closed. The lower float and the oil flow baffle monitor the heavy gas, that is, a large amount of oil flow will push the baffle. When a minor fault occurs inside the transformer body, gas will be generated. When this gas accumulates to a certain extent of 200ml-300ml, the upper float falls and the light gas moves. When the transformer body leaks oil or the oil pillow itself has less oil, the ambient temperature drops, causing the volume to shrink, and the oil level in the oil pillow drops below the lower float, the lower float will move. The probe of the gas relay is the button of the transmission signal. When it is pressed about two-thirds, the light gas contact moves, and when it is fully pressed, the heavy gas signal moves. This instrument will start from the probe position, measure the position L of the probe at the time of contact action, and analyze the operating status of the tested equipment from this position L.

[0061] The gas relay inspection items include appearance inspection, insulation resistance test, withstand voltage test, sealing test, flow rate setting value, and gas volume test. The flow rate setting value and gas volume test require the gas relay to be disassembled and carried out on a special test bench. The gas relay has been tested during the factory and handover process. With the increase of running time, the actual action value of the gas relay may deviate from the set value. Once the action set value is inaccurate, it may cause the gas relay contacts to malfunction or refuse to operate. Malfunction may cause abnormal shutdown of the transformer, and refusal to operate may expand the scope of the accident.

[0062] Currently, when calibrating the gas relay, it needs to be removed from the transformer body and installed on a special gas calibration platform for calibration. The disassembly, installation, transportation, and calibration processes all require a lot of manpower.

[0063] After disassembling the gas relay, the main body and the oil pillow need to be connected as soon as possible. Generally, the gas relay that needs to be calibrated is replaced with a qualified gas relay spare part on site. It takes 2 skilled masters 2.5 hours to disassemble and install the gas relay. At the same time, the gas calibrator is bulky and most of them are laboratory equipment. It is not convenient to bring it to the transformer site. The disassembled gas relay needs to be transported to a special laboratory. The following figure shows a gas relay calibration table, which weighs more than 300kg. Based on the above gas relay background, I invented and developed a gas relay double float action stroke measuring instrument. The instrument is small in size, light in weight, and easy to carry. It does not need to disassemble the secondary wiring in the gas relay junction box or the gas relay. It can complete the measurement of the double float action stroke of the gas relay online. The measurement data can feedback the accuracy of the gas relay setting in a certain sense.

[0064] The present invention does not require disassembling the gas relay and can verify the action strokes of the upper and lower floats of the gas relay online.

[0065] The action stroke of the upper float: it can reflect the descending height of the upper float when the light gas contact is in action. This value has a certain correlation with the action volume of the light gas. The larger the stroke, the larger the action volume, and the smaller the stroke, the smaller the action volume.

[0066] The action stroke of the lower float ball: It can reflect the height of the lower float ball when the heavy gas contact is actuated, but there is no functional relationship between it and the flow velocity setting of the baffle. In other words, the action stroke of the lower float ball cannot reflect the flow velocity setting, and there is no approximate or substitution relationship with the heavy gas flow velocity calibrated in the current regulations. There is no domestic calibration procedure for the action stroke of the lower float ball. A certain converter station once had a gas relay trip due to external mechanical vibration during operation, and the internal contacts were closed. The deeper reason was that the action stroke of the gas relay was too short. To put it bluntly, the reed contact was too close to the permanent magnet in the gas. Under the condition of shaking, the reed contact was attracted. The current flow velocity setting calibration cannot find this. In other words, the country is currently only calibrating the flow velocity setting of the baffle that can drive the action of the lower float ball, and there is no regulation requirement to stipulate the extent to which the lower float ball drops for the contact to be attracted.

[0067] The present invention provides a gas relay calibration device, which uses the telescopic end of the pusher 12 to pass through the through hole in the middle of the connecting part 8 to push the gas relay probe downward, starting from the probe position, measures the position of the probe when the gas relay contact is actuated, and analyzes the operating status of the tested equipment from this position; at the same time, the gas relay calibration device has a small instrument size, light weight, and is easy to carry, and does not require disassembly of the secondary wiring in the gas relay junction box or the gas relay. The present invention verifies the action stroke of the upper and lower floats of the gas relay online, and feeds back the accuracy of the gas relay constant through the measurement data. The action stroke of the upper float, the descending height of the upper float, represents the gas volume, and can replace the calibration of the light gas action volume in a certain sense. The action stroke of the lower float can check the stroke range of the heavy gas contact action and the consistency of the three auxiliary contact actions.

[0068] The gas relay calibration device provided by the present invention can measure the simultaneity of contact action by calibrating the gas relay through the action stroke. This is not included in the current domestic calibration procedures. A gas relay in a certain converter station once had an internal contact closed due to external mechanical vibration during operation, resulting in tripping. The underlying reason was that the action stroke of the gas relay was too small, that is, the reed contact was too close to the permanent magnet in the gas. Under the condition of shaking, the reed contact was attracted. This cannot be discovered by the current flow rate constant calibration. In other words, the country currently only calibrates the baffle flow rate constant that can push the lower float to move, and there is no regulation requirement to stipulate to what extent the lower float drops for the contact to be attracted. The gas relay calibration device provided by the present invention can measure the simultaneity of contact action by calibrating the gas relay through the action stroke. Example

[0069] This embodiment is based on embodiment 1. Figure 5 The figure is a schematic diagram of the structure of the push rod 3, the telescopic end of the push member 12 is connected to the push rod 3, the push rod 3 is threadedly connected to the contact 4, and the contact 4 passes through the through hole opened in the middle of the connecting portion 8;

[0070] A rod is fixed at one end of the contact 4. Figure 6 The figure shows a schematic diagram of the structure of a rod body fixed at one end of the contact 4, an external thread is provided on the outside of the rod body, and the external thread is threadedly connected with the internal thread provided at the end of the push rod 3; the threaded connection between the contact 4 and the push rod 3 is used to adjust the overall length of the contact 4 and the push rod 3, so that the push member 12 returns to the zero position and the contact 4 just contacts with the probe of the gas relay when the verification device is installed on the gas relay. Example

[0071] This embodiment is based on Embodiment 2, wherein the connecting portion 8 is a locking nut, which includes a connecting cylinder, an inner side of which is provided with an internal thread, and the internal thread is threadedly connected to the external thread of the gas relay probe; a clamping disk coaxial with the connecting cylinder is fixedly connected to the top of the connecting cylinder, and through holes are provided in the clamping disk and the middle of the connecting cylinder to allow the push rod 3 and the contact 4 to pass through; a toothed groove is provided on the side wall of the clamping disk of the connecting portion 8 for facilitating manual rotation of the connecting portion 8 so that it can be fastened to the screw at the bottom of the gas relay probe.

[0072] The connecting part 8 in the present invention is a rotating nut, which is used to be fastened and connected with the screw at the bottom of the gas relay probe. When in use, the connecting part 8 is manually rotated to be threadedly connected with the screw at the bottom of the gas relay probe. Example

[0073] This embodiment is based on the embodiment 2, the induction plate 9 is fixedly connected to the side wall of the push rod 3 through the induction plate mounting block 5, as shown in FIG. Figure 7 The figure shows a schematic diagram of the structure of the induction plate mounting block 5 , which moves with the push rod 3 ; the photoelectric sensor 11 is fixed on the photoelectric sensor mounting plate 10 , and the photoelectric sensor mounting plate 10 is connected to the fixed end of the push member 12 .

[0074] Furthermore, the sensing plate 9 is connected to the sensing plate mounting block 5 sleeved and fixed on the side wall of the push rod 3 through a first connecting component, the first connecting component includes a first slide groove 15, the first slide groove 15 is provided on the sensing plate 9, and the extension direction of the first slide groove 15 is the same as the pushing direction of the push rod 3; the first slide groove 15 is provided with a second locking nut 16 running through it, and the second locking nut 16 is fixedly connected to the sensing plate mounting block 5;

[0075] Among them, after tightening the second locking nut 16, the sensing plate 9 is fixed on the sensing plate mounting block 5. After loosening the second locking nut 16, the first sliding groove 15 opened on the sensing plate 9 slides relative to the second locking nut 16 to adjust the relative position between the sensing plate 9 and the sensing plate mounting block 5.

[0076] Further, the photoelectric sensor 11 is connected to the photoelectric sensor mounting plate 10 through a second connecting component, and the second connecting component includes a second slide groove 17, the second slide groove 17 is provided on the photoelectric sensor mounting plate 10, and the extension direction of the second slide groove 17 is the same as the extension direction of the push rod 3; the second slide groove 17 is provided with a third locking nut 18 running through it, and the third locking nut 18 is fixedly connected to the photoelectric sensor 11;

[0077] Among them, after tightening the third locking nut 18, the photoelectric sensor 11 is fixed on the photoelectric sensor mounting plate 10. After loosening the third locking nut 18, the photoelectric sensor 11 and the third locking nut 18 slide along the second slide groove 17 to adjust the relative position between the photoelectric sensor 11 and the photoelectric sensor mounting plate 10. Example

[0078] This embodiment is based on embodiment 4, and the support assembly includes a first cover plate 1, a second cover plate 7, two connecting rods 2, a locking block 6 and a locking screw; the first cover plate 1 is fixed to the fixed end of the push member 12, and a through hole is provided in the middle thereof to allow the push rod 3 to pass through; the first cover plate 1 is also fixedly connected to the upper end of the photoelectric sensor mounting plate 10; the second cover plate 7 is provided with a through hole in the middle thereof that cooperates with the connecting cylinder of the connecting part 8, and the clamping disc of the connecting part 8 is clamped on the surface of the second cover plate 7; the second cover plate 7 is also fixedly connected to the lower end of the photoelectric sensor mounting plate 10; the two connecting rods 2 are parallel to the push rod 3 and are symmetrically placed on both sides of the push rod 3; one end of each connecting rod 2 is fixedly connected to the first cover plate 1, and the other end of each connecting rod 2 is fixedly connected to the second cover plate 7; Figure 8 The front view of the locking block 6 is shown. Fig. 9 The figure shows a schematic diagram of the side structure of the locking block 6, wherein the locking block 6 is a diamond-shaped structure as a whole, and a through hole is provided in the middle of the diamond to allow the push rod 3 to pass through, and the diameter of the through hole is smaller than the outer diameter of the clamping disc; a through hole is provided on each side of the diamond to cooperate with the connecting rod 2, and the two through holes are respectively sleeved on the side walls of the two connecting rods 2; the locking screw passes through the through hole provided on the locking block 6 and contacts the side wall of the connecting rod 2, so that the locking block 6 presses the connecting part 8 onto the second cover plate 7.

[0079] The present invention uses a support assembly to press the connection part 8, that is, the rotating nut, onto the second cover plate 7 to prevent the connection part 8 from shaking. Fig.10 The figure shows the structure of the connection part 8. The connection part 8 is connected with the screw thread at the bottom of the gas relay probe, that is, the gas relay test device is connected with the gas relay by the connection part 8. After the test device is installed, when the pusher 12 returns to the zero position, the contact 4 just contacts with the gas relay probe, and the contact 4 presses down the gas relay probe under the push of the pusher 12. Example

[0080] This embodiment is based on embodiment 1, and the processor is an industrial control computer 14, which is connected to the motor driver 13 for sending control signals thereto, and is also used to receive the zero position signal fed back by the motor driver 13, the current position signal of the pusher, and the propulsion stroke of the pusher 12 when the gas relay contact is actuated.

[0081] Furthermore, the industrial control computer 14 is also connected to an input module, a recording module, and a display module; the input module is used to input the zero position signal of the pusher 12, the advancement speed of the pusher 12, the maximum operating stroke of the pusher 12, and the opening and closing signals of the pusher 12; the recording module is used to record the current position of the pusher 12 and the advancement stroke data of the pusher 12 when the gas relay contact is actuated; the display module is used to display the parameters input by the input module.

[0082] Furthermore, the motor driver 13 is connected to a power module.

[0083] Furthermore, the industrial control computer 14 is also provided with control buttons, which are used to input parameters such as com port, motor address, maximum stroke, operating speed, motor target position, etc., and are also used to input commands such as "run", "stop", "speed run", "position run", "find original position", and "return to original position".

[0084] Working principle of the present invention:

[0085] The present invention provides a gas relay calibration device, and the specific application steps are as follows:

[0086] 1. Measure the basic data of the device under test

[0087] Use a vernier caliper to measure the distance X1 between the head of the gas probe and the bottom of the screw at the bottom of the gas relay. After fully pressing the probe, measure the distance X2 between the head of the probe and the bottom of the screw at the bottom of the gas relay.

[0088] Connect the calibration device to the industrial computer

[0089] The industrial control computer is a personal computer, the personal computer is connected to USB, and the controller is connected to the 485 OUT port.

[0090] Adjust zero signal

[0091] First, the zero position signal is installed at the anti-limit position so that the reverse rotation will not exceed the zero position. Zero position return only needs to be run when the system is just powered on, because the current motor position cannot be known after power failure, and there is no need to trigger it again after the return is completed.

[0092] Trigger zero position return. At this time, the motor does not know the absolute zero position. The motor rotates in the opposite direction at the primary speed (slightly faster). The return speed will be overshooting. Therefore, after sensing the zero position signal, the secondary speed (extremely slow) is used. It stops when there is no zero position signal. There is basically no overshoot (the slower the secondary speed, the more accurate the position). This position is recorded as the zero position. If the zero position return is triggered, the motor zero position signal is valid and runs directly at the secondary speed. (The primary speed and secondary speed are internal settings of the motor driver).

[0093] Before installing the instrument to the device under test, click the "Find Home Position" button on the human-machine interface. After the motor returns to the zero position and stops, use a vernier caliper to measure the distance X3 from the push rod contact to the top of the connection part, and adjust the position of the photoelectric sensor, induction board, and induction board mounting block to make X3 basically equal to X1.

[0094] Adjusting contact position

[0095] In the above step 3, if X3 is not equal to X1, the push rod contact can be rotated and adjusted. The contact changes by 1mm for each rotation, so that X3=X1. If X3 is equal to X1 after the adjustment in step 3, this step is not required.

[0096] The instrument is mounted to the probe of the device under test

[0097] like Fig.13 FIG. 1 is a schematic diagram showing the location of the gas relay probe of the present invention. Fig.14 The figure shows the position of the screw at the bottom of the gas relay probe of the present invention. When installing the gas relay test device, tighten the screw at the bottom of the gas relay probe through the connecting part 8 (make sure that the top of the connecting part contacts the bottom of the screw at the bottom of the gas relay probe, so that the position of the push rod contact just contacts the top of the probe), as shown in FIG. Fig.15 FIG. 1 is a schematic diagram showing the present invention installed on a gas relay. FIG. 1 is a schematic diagram showing the contact 4 pushing the probe downward after the gas relay test device is installed. Fig.11 shown.

[0098] Wiring of the device under test

[0099] The instrument can measure the travel of 5 pairs of contact signals at the same time. At present, EMB gas relays generally have 2 pairs of light gas signal contacts and 3 pairs of heavy gas signal contacts. There are 10 terminals in the gas junction box, such as Fig.16 The figure shows the wiring diagram of the gas relay contact of the present invention. The above 5 pairs of contacts and 10 terminals are connected to the instrument respectively.

[0100] Set the operating parameters of the linear drive motor

[0101] Set the running speed to 1mm / s and set the maximum stroke to 12mm based on the measurement results in step 1.

[0102] Start measuring work

[0103] like Fig.12 The figure shows the display interface of the industrial computer of the present invention. Click the "Run" button on the interface to start the measurement. After the measurement is completed, the data is automatically displayed and automatically stopped. During the measurement process, manually click the "Stop" button to stop the instrument.

[0104] End of measurement

[0105] Click "Return to Home Position" and the stepper motor returns to the initial zero position, and the measurement ends.

[0106] Data Analysis:

[0107] The following are the data results measured by a tested gas relay. These two sets of data are analyzed from two aspects.

[0108] Difference calculation

[0109] The difference in the stroke of the operating contacts reflects the quality of the simultaneity of the contact action. Theoretically, two pairs of light gas contacts should act simultaneously, and three pairs of heavy gas contacts should act simultaneously. However, due to the production process, completely simultaneous action cannot be achieved. However, at present, there are no regulations or rules requiring the mutual difference range of the simultaneity of the actions of two or three of them.

[0110] The difference between the two light gas connections: 5.8942-3.9742=1.92

[0111] Heavy gas difference 1: 11.6362-11.4482=0.188

[0112] Heavy gas difference 2: 11.6362-11.6362=0

[0113] The smaller the difference, the better the simultaneity of the two contacts. When the two are exactly the same, the two contacts act simultaneously. The larger the difference, the worse the simultaneity. The above three differences show that the simultaneity of the two light gas contacts is poor, and the simultaneity of the three heavy gas contacts is good. The two contacts act completely simultaneously.

[0114] Absolute value

[0115] The total stroke of an EMB gas relay probe is about 12mm, of which the first 8mm is used to press down the upper float and the last 4mm is used to press down the lower float. The absolute value of the light gas stroke and the absolute value of the heavy gas stroke minus 8mm reflect the distance from the initial state of the permanent magnet inside the gas relay to the state where the permanent magnet can just attract the reed contact. In transformer gas protection, the light gas signal is used to alarm or trip, and the heavy gas signal is used to trip.

[0116] Discussion on the Relationship between Light Gas Actuation Stroke and Actuation Volume

[0117] The movement stroke of the gas push rod and the distance of the up and down movement of the float are in a proportional functional relationship, and this functional relationship is related to the internal structure size of the gas.

[0118] The float on the gas relay is close to the top of the gas relay when the gas relay is full of oil and floating (the buoyancy of the float is greater than the gravity of the float and the iron sheet carried by the float). When gas begins to accumulate inside the gas relay, the oil level drops. When it drops to a certain level (the buoyancy of the float is equal to the gravity of the float and the iron sheet carried by the float), the float drops with the drop of the oil level. The action volume of the light gas is equal to the volume of gas above the oil surface in the gas relay at the moment of contact action (the shape of the gas relay is irregular and can be divided into two upper and lower cross-sectional areas for calculation. The cross-sectional areas within the upper 1.17 cm are equal, and the areas after 1.17 cm are equal).

[0119] Actual measurement of a BF25 gas relay produced by EMB

[0120] a Actual measurement: The ratio k of the downward stroke of the float and the downward stroke of the probe is 3.5 (the probe is pressed down 8mm and the float is pressed down 28mm).

[0121] b Actual measurement: The diameter of the gas float is 4.2 cm. When the float is in the insulating oil and just floats up, it is about half higher than the oil level, that is, 2.1 cm.

[0122] c Actual measurement of the cross-sectional area of ​​the core of the gas relay: The inner shell of the gas relay is 10.2cm long and 9.5cm wide, so the area of ​​the inner shell is 96.9cm 2 , gas relay core height 10cm, volume 82.45cm 3 , excluding the two floating balls carried by the core, it is assumed that the cross-sectional area of ​​the core is equal at the top and bottom, so the cross-sectional area of ​​the core is 8.245cm 2 , then the remaining static cross-sectional area in the watt relay = 10.2*9.5-8.245=88.655cm 2

[0123] d Actual measurement of the cross-sectional area of ​​the top of the gas relay of 1.17cm: The cross-sectional area within the range of the top height of the gas relay is smaller. According to the cross-sectional area of ​​88.655, the volume is: 103.7cm 3 The actual measured volume is 80cm 3 , calculate 23.7cm more 3 .

[0124] dThe downward pressure stroke of the gas probe is L, in cm.

[0125] e When the gas contact is actuated, the height of the gas above the oil surface is h

[0126] Then h = kL + 2.1 = 3.5L + 2.1cm

[0127] fThe volume of the floating ball: V = 4 / 3πr3 = 38.77 cm 3 When the gas relay is in action, about half of it floats on the oil surface, so the volume of the float on the oil surface is 19.385cm 3

[0128] Then the relationship between the gas action volume V and the float stroke is:

[0129] V=88.655*(3.5L+2.1)-19.385-23.7

[0130] After sorting out:

[0131] V=88.655*(3.5L+2.1)-43.085

[0132] Substituting the action stroke of light gas into the above formula, the action volume is obtained as follows:

[0133] V1=88.655*(3.5*0.39742+2.1)-43.085=266.3cm 3

[0134] V2=88.655*(3.5*0.58942+2.1)-43.085=326.3cm 3

[0135] The fixed value is 200-300cm 2 For the gas relay, the formula V=88.655*(3.5L+2.1)-43.085 is used as the calculation formula for the light gas action stroke and action volume, and the stroke range is between 0.1834-0.5056cm. If the probe stroke exceeds this range, the light gas action volume is unqualified.

[0136] In summary, the present invention provides a gas relay calibration device, which completes the measurement of the double float action stroke of the gas relay online, and feeds back the accuracy of the gas relay setting through the measurement data. At the same time, the gas relay calibration device has a small size, light weight, and is easy to carry. There is no need to disassemble the secondary wiring in the gas relay junction box or the gas relay.

[0137] The above disclosures are only several specific embodiments of the present invention. However, the embodiments of the present invention are not limited thereto. Any changes that can be conceived by those skilled in the art should fall within the protection scope of the present invention.

Claims

1. A gas relay testing device, characterized in that: include: Pushing member (12); A connecting portion (8) is connected to the fixed end of the pusher (12) via a supporting assembly; the connecting portion (8) is connected to a screw at the bottom of the gas relay probe, and a through hole is provided in the middle of the connecting portion (8) to allow the telescopic end of the pusher (12) to pass through; A sensing plate (9) connected to the telescopic end of the pushing member (12); A photoelectric sensor (11) is connected to a fixed end of the pusher (12); the photoelectric sensor (11) is used to send a signal indicating that the pusher (12) has returned to a zero position when the sensing plate (9) blocks the photoelectric sensor (11); A motor driver (13) connected to the photoelectric sensor (11) for collecting a signal indicating that the pusher (12) has returned to a zero position, connected to the pusher (12) for driving the pusher to extend and retract, and connected to a contact of a gas relay for providing feedback of a propulsion stroke of the pusher (12) relative to the zero position when the contact is actuated; A processor connected to the motor driver (13) for sending a control signal thereto, and also for receiving a zero position signal fed back by the motor driver (13), a current position signal of the pusher (12), and a propulsion stroke of the pusher (12) when the gas relay contact is actuated; The telescopic end of the pushing member (12) is connected to the push rod (3), and the push rod (3) is threadedly connected to the contact (4); a through hole is provided in the middle of the connecting portion (8) to allow the contact (4) to pass through; The connecting portion (8) comprises a connecting cylinder, the inner side of which is provided with an internal thread, the internal thread being threadedly connected to the external thread of the screw at the bottom of the gas relay probe; a clamping disc coaxial with the connecting cylinder is fixedly connected to the top of the connecting cylinder, and through holes are provided in the middle of the clamping disc and the connecting cylinder to allow the push rod (3) and the contact (4) to pass through; The side wall of the connecting portion (8) clamping disc is provided with a toothed groove for facilitating manual rotation of the connecting portion (8) so as to fasten the connecting portion (8) with the screw at the bottom of the gas relay probe; A rod body is fixed at one end of the contact (4), and an external thread is provided on the outside of the rod body, and the external thread is threadedly connected to an internal thread provided at the end of the push rod (3); the threaded connection between the contact (4) and the push rod (3) is used to adjust the overall length of the contact (4) and the push rod (3).

2. A gas relay testing device as claimed in claim 1, characterized in that: The sensing plate (9) is fixedly connected to the side wall of the push rod (3) via a sensing plate mounting block (5); the photoelectric sensor (11) is fixed on a photoelectric sensor mounting plate (10), and the photoelectric sensor mounting plate (10) is connected to a fixed end of the pushing member (12).

3. A gas relay testing device as claimed in claim 2, characterized in that: The sensing plate (9) is connected to a sensing plate mounting block (5) sleeved and fixed on the side wall of the push rod (3) via a first connecting component, wherein the first connecting component comprises: A first slide groove (15) is provided on the sensing plate (9), and an extending direction of the first slide groove (15) is the same as a pushing direction of the push rod (3); A second locking nut (16), passing through the first sliding groove (15) and fixedly connected to the sensor plate mounting block (5); The sensing plate (9) is fixed on the sensing plate mounting block (5) after the second locking nut (16) is tightened, and the first sliding groove (15) provided on the sensing plate (9) slides relative to the second locking nut (16) after the second locking nut (16) is loosened, thereby adjusting the relative position between the sensing plate (9) and the sensing plate mounting block (5).

4. A gas relay testing device as claimed in claim 2, characterized in that: The photoelectric sensor (11) is connected to the photoelectric sensor mounting plate (10) via a second connecting component, wherein the second connecting component comprises: A second slide groove (17) is provided on the photoelectric sensor mounting plate (10), and an extending direction of the second slide groove (17) is the same as a telescopic direction of the push rod (3); A third locking nut (18), passing through the second sliding groove (17) and fixedly connected to the photoelectric sensor (11); The photoelectric sensor (11) is fixed on the photoelectric sensor mounting plate (10) after the third locking nut (18) is tightened, and the photoelectric sensor (11) and the third locking nut (18) are slid along the second slide groove (17) after the third locking nut (18) is loosened to adjust the relative position between the photoelectric sensor (11) and the photoelectric sensor mounting plate (10).

5. A gas relay testing device as claimed in claim 2, characterized in that: The support assembly comprises: A first cover plate (1) is fixed to the fixed end of the push member (12), and a through hole is provided in the middle thereof for allowing the push rod (3) to pass through; the first cover plate (1) is also fixedly connected to the upper end of the photoelectric sensor mounting plate (10); A second cover plate (7) has a through hole in the middle thereof which cooperates with the connecting cylinder of the connecting portion (8), and the connecting disc of the connecting portion (8) is clamped on the surface of the second cover plate (7); the second cover plate (7) is also fixedly connected to the lower end of the photoelectric sensor mounting plate (10); Two connecting rods (2) are parallel to the push rod (3) and symmetrically placed on both sides of the push rod (3); one end of each connecting rod (2) is fixedly connected to the first cover plate (1), and the other end of each connecting rod (2) is fixedly connected to the second cover plate (7); The locking block (6) is of a diamond-shaped structure as a whole, with a through hole in the middle of the diamond allowing the push rod (3) to pass through, the diameter of the through hole being smaller than the outer diameter of the clamping disc; a through hole is respectively provided on both sides of the diamond to cooperate with the connecting rod (2), and the two through holes are respectively sleeved on the side walls of the two connecting rods (2); A locking screw passes through a through hole formed in the locking block (6) and contacts the side wall of the connecting rod (2), so that the locking block (6) presses the connecting portion (8) onto the second cover plate (7).

6. A gas relay testing device as claimed in claim 1, characterized in that: The processor is an industrial control computer (14), which is connected to the motor driver (13) for sending control signals thereto, and is also used to receive a zero position signal fed back by the motor driver (13), a current position signal of the pusher, and a propulsion stroke of the pusher (12) when the gas relay contact is actuated; The industrial control computer (14) is also connected to an input module, a recording module, and a display module; the input module is used to input a zero position signal of the pusher (12), a propulsion speed of the pusher (12), a maximum operating stroke of the pusher (12), and an opening and closing signal of the pusher (12); the recording module is used to record the current position of the pusher (12) and the propulsion stroke data of the pusher (12) when the gas relay contact is actuated; and the display module is used to display the parameters input by the input module and the data recorded by the recording module.

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