WO2023070779A1 - Vacuum arc-extinguishing chamber test system for transformer on-load tap-changer and method therefor - Google Patents

Abstract

The present application relates to the field of large-scale transformer on-load tap-changer production, and relates in particular to a vacuum arc-extinguishing chamber test system for a transformer on-load tap-changer and a method therefor. The system solution is as follows: insulating oil is injected into a test box so that the insulating oil is higher than the length of a housing of a vacuum arc-extinguishing chamber, such that the vacuum arc-extinguishing chamber is in an insulating state, reducing the effect on the vacuum arc-extinguishing chamber of an electromagnetic environment; meanwhile, a heating member is provided in the test box to heat the insulating oil, and a power supply supplies power to the vacuum arc-extinguishing chamber so as to simulate the working current of the vacuum arc-extinguishing chamber when working, thereby simulating the actual dynamic working environment of the vacuum arc-extinguishing chamber; a driving assembly drives a transmission rod to reciprocate up and down, so as to drive a movable conductive rod to move up and down, enabling the vacuum arc-extinguishing chamber to open and close; and a control device controls the heating member to heat up, so that the vacuum arc-extinguishing chamber is in the simulated actual dynamic working environment for opening and closing performance tests, which meets operational reliability requirements of the vacuum arc-extinguishing chamber, and improves test accuracy.

Description

Vacuum interrupter test system and method for transformer on-load tap-changer technical field

The application relates to the production field of large-scale transformer on-load tap-changers, in particular to a vacuum interrupter test system and method for transformer on-load tap-changers.

Background technique

The large-scale transformer on-load tap-changer is a special switch used to switch the tap of the primary or secondary winding and adjust its output voltage when the transformer is loaded. It usually consists of two parts: a drive mechanism and a selector switch. , where the vacuum interrupter is a key component in the on-load tap-changer, which is mainly used to effectively cut off the load current during the shifting process of the tap-changer to ensure a smooth shifting process.

In the related art, as shown in FIG. 1, the vacuum interrupter 31 includes a housing 317, a shielding cover 318, a static conductive rod 312, a moving conductive rod 311, two moving contacts 313, and a bellows 314. The shielding cover 318 is located on a ceramic Inside the casing, the static conductive rod 312 and the movable conductive rod 311 are arranged in the shielding cover 318, the static conductive rod 312 is respectively arranged at both ends of the housing 317, and the two moving contacts 313 are connected to the static conductive rod 312 and the dynamic conductive rod respectively. At opposite ends of the rod 311 , the bellows 314 are sheathed on the moving conductive rod 311 . The opening and closing of the circuit is completed by making the two moving contacts 313 contact and separate.

Since the vacuum interrupter plays a key role in the on-load tap-changer, and the price is relatively expensive, it is necessary to carry out an item-by-item test on the performance of the vacuum interrupter before the on-load switch leaves the factory, such as vacuum degree test and Wear and tear of moving contacts, etc., to ensure the quality of the on-load switch. However, there is no effective test method for the opening and closing of the vacuum interrupter, and it is difficult to meet the needs of evaluating the operational reliability of the vacuum interrupter.

Contents of the invention

In order to meet the requirement of evaluating the operational reliability of a vacuum interrupter, the present application provides a vacuum interrupter test system and method for a transformer on-load tap changer.

In the first aspect, the present application provides a vacuum interrupter test system for transformer on-load tap-changers, which adopts the following technical solutions:

A vacuum interrupter test system for transformer on-load tap changer, including a test box, the vacuum interrupter is detachably connected to the test box, the top of the test box is provided with a cover plate, the cover plate There is a first perforation on the top of the test chamber, and a second perforation is provided on the bottom of the test chamber. The moving conductive rod of the vacuum interrupter penetrates the first perforation and extends out of the first perforation. The vacuum interrupter The static conduction rod of the chamber passes through the second through hole and protrudes out of the second perforation, and the protruding end of the dynamic conduction rod of the vacuum interrupter and the protruding end of the static conduction rod are connected to an external power supply. The test box is equipped with insulating oil, and the insulating oil is immersed in the shell of the vacuum interrupter, the test box is provided with a heating element for heating the insulating oil, and the test box is provided with a device for controlling The control device for heating the heating element and the control power supply, the control device is connected with the control power supply, a bracket is arranged on the top of the test box, and a transmission rod is rotatably connected to the bracket, and one end of the transmission rod is connected to the dynamic The conductive rod is connected, and the end of the cover plate away from the movable conductive rod is provided with a driving assembly for driving the movable conductive rod to move up and down.

Through the above technical scheme, inject insulating oil into the test box, so that the insulating oil is higher than the length of the shell of the vacuum interrupter, so that the vacuum interrupter is in an insulating state, reducing the influence of the electromagnetic environment on the vacuum interrupter, and at the same time The heating element is set in the test chamber to heat the insulating oil to simulate the thermal working environment of the vacuum interrupter, and the power supply supplies power to the vacuum interrupter to simulate the working current of the vacuum interrupter, thereby simulating the actual temperature of the vacuum interrupter. Dynamic working environment, then the drive assembly drives the transmission rod to rotate up and down, so as to drive the movable conductive rod to move up and down, so that the two moving contacts of the vacuum interrupter can automatically contact or separate, so that the vacuum interrupter can be opened and closed, and the control device can control the heating The parts are heated, so that the vacuum interrupter is in the simulated actual dynamic working environment for opening and closing tests, so as to meet the requirements of the operation reliability of the vacuum interrupter, improve the accuracy of the test, and the operation is simple, which is convenient for the staff to operate.

Preferably, the drive assembly includes a cam and a motor, the motor is arranged on the cover plate, the cam is fixedly sleeved on the output shaft of the motor and is located above the transmission rod, and the The side wall interferes with the end of the transmission rod away from the moving conduction rod.

By adopting the above technical solution, the motor is started to rotate the cam. Since the side wall of the cam is in contact with the end of the transmission rod away from the movable conductive rod, the transmission rod can be reciprocated up and down to realize automatic control of the vertical movement of the conductive rod, which is convenient for the staff. Mechanically open and close the vacuum interrupter.

Preferably, the heating element is a heating wire group, the heating wire group is arranged on the inner wall of the test box and the cover plate, the input end of the heating wire group is connected to the control device, and the heating wire group is connected to the control device. The output end of the heating wire group is connected with the control power supply.

By adopting the above technical solution, the heating wire group is arranged on the inner wall of the test chamber and the cover plate, which can evenly heat the insulating oil to the required temperature, so as to optimize the thermal simulation working environment of the vacuum interrupter.

Preferably, the control device includes a temperature monitoring module, the accumulation module includes a temperature detection sub-module and a control sub-module, the temperature detection sub-module is arranged on the test box, and the temperature detection sub-module is used to detect the The temperature of the insulating oil and generate a temperature abnormal signal, the temperature detection sub-module is electrically connected to the input end of the control sub-module, and the output end of the control sub-module is electrically connected to the input end of the heating wire group.

By adopting the above technical solution, the temperature detection sub-module can monitor the temperature of the insulating oil in real time. When the control sub-module receives an abnormal temperature signal from the temperature detection sub-module, it controls the heating wire to heat or stop heating to ensure the temperature of the insulating oil. Maintain a certain temperature value so that the thermal simulation work environment remains stable.

Preferably, the control device further includes an alarm module, the input end of the alarm module is connected to the output end of the control sub-module.

By adopting the above technical scheme, when the control sub-module receives the corresponding abnormal temperature signal, the control sub-module will control the alarm sub-module to work, and timely notify the staff of the abnormal temperature of the insulating oil in the test chamber.

Preferably, the control device further includes an accumulation module, and the counting submodule includes a processing submodule, a current detection submodule, and a counting submodule, and the processing submodule, the current detection submodule, and the counting submodule are all Set on the test box, the current detection sub-module is used to detect the current when the vacuum interrupter is opened and closed and sends a current detection signal, and the processing sub-module is used to receive and process the current from the current detection sub-module The output current detection signal, the counting submodule is used to accumulate the number of opening and closing of the vacuum interrupter, the signal output terminal of the current detection submodule is connected to the input terminal of the processing submodule, the counting submodule and The driving components are all electrically connected to the output ends of the processing sub-modules.

By adopting the above technical solution, the current detection sub-module detects the working current of the vacuum interrupter, and when the current detection sub-module detects the disconnection of the working current of the vacuum interrupter, the current detection signal is input to the processing sub-module, and the processing sub-module After the module is identified and processed, it controls the cumulative counting of the counting sub-module. When the cumulative count of the counting sub-module reaches the preset number of tests, the counting sub-module sends a counting signal to the processing sub-module, and the processing sub-module controls the driving component to stop working, thus enabling The number of opening and closing of the vacuum interrupter is automatically accumulated, which is convenient for the staff to operate and shortens the test time.

Preferably, the top of the test box is provided with sealing ribs in the circumferential direction, and the cover plate is provided with sealing grooves in which the sealing ribs snap fit.

By adopting the above-mentioned technical scheme, the sealing convex strip and the sealing groove are clamped and matched to enhance the sealing between the top of the test box and the cover plate, so that the insulating oil is not easy to seep out from the gap between the cover plate and the test box.

Preferably, a connecting block is arranged between the transmission rod and the moving conductive rod, one end of the connecting block is connected with a sliding block, and the driving rod slides close to one end of the moving conductive rod of the vacuum interrupter. the sliding slot, the sliding block and the sliding slot slidingly fit, the connecting block and the moving conductive rod of the vacuum interrupter are provided with fastening rods for fixing the moving conductive rod of the vacuum interrupter pieces.

By adopting the above technical scheme, the movable conductive rod is fixed on the connecting block by fasteners, so that when the transmission rod swings up and down, the connecting block will drive the sliding block to slide in the sliding groove. The first perforation moves up and down, and now the first perforation limits the position of the movable conductive rod, thereby realizing that the transmission rod drives the movable conductive rod to move up and down, thereby facilitating the lifting and pulling of the conductive rod.

Preferably, the fastener is a fastening bolt, a through hole is provided on the moving conductive rod of the vacuum interrupter, a threaded hole is provided at the end of the connecting block away from the sliding block, and the fixing bolt Through the through hole and threadedly connected with the threaded hole.

By adopting the above technical solution, the fixing bolt penetrates through the through hole and is threadedly connected with the threaded hole, so that it is convenient for the staff to install and disassemble the moving conductive rod and the transmission rod of the vacuum interrupter, so as to facilitate the subsequent installation and removal of the vacuum interrupter.

In the second aspect, the present application provides a test method for a vacuum interrupter for transformer on-load tap-changers, which adopts the following technical scheme:

S1. Install the sample of the vacuum interrupter to be tested in the test box, so that the static conductive rod of the vacuum interrupter extends from the second perforation to the outside of the test box, and the dynamic conductive rod of the vacuum interrupter extends from the first perforation. out to the outside of the cover;

S2. Connect the extended end of the moving conductive rod of the vacuum interrupter to the transmission rod, start the motor installed on the cover plate, and debug the test device;

S3. After S2 is completed, inject insulating oil into the test chamber, so that the insulating oil is immersed in the housing in the vacuum interrupter 31;

S4. The heating wire group is energized, and the heating wire group heats the insulating oil, and connects the power supply to the vacuum interrupter, so that the vacuum interrupter is in a working state;

S5. Set the target number of tests, start the motor installed on the cover plate, and rotate the cam installed on the output shaft of the motor, so that the transmission rod drives the conductive rod to move up and down to mechanically open and close the vacuum interrupter 31, and accumulate vacuum extinguishing The number of opening and closing times in the arc chamber;

S6. When the number of tests reaches the preset value, turn off the control power supply, take out the vacuum interrupter sample for performance testing according to relevant standards, and record relevant test data.

By adopting the above technical scheme, by heating the insulating oil and energizing to simulate the actual dynamic working environment, the vacuum interrupter is placed in the simulated working environment of energization and constant temperature heating, and the influence of the long-term opening and closing of the vacuum interrupter is simulated to improve the efficiency of the vacuum interrupter. Accuracy of arc chamber test data.

In summary,

1. Insulating oil is injected into the test box, and the dynamic working environment of the vacuum interrupter is simulated at the same time. The drive assembly drives the transmission rod to reciprocate up and down to make the vacuum interrupter open and close, and the opening and closing tests of the vacuum interrupter are accumulated. The opening and closing test provides an effective test device to improve the accuracy of the test, and the operation is simple and convenient for the staff to operate;

2. Using heating insulating oil and energizing to simulate the actual dynamic working environment, putting the vacuum interrupter in the simulated working environment of energization and constant temperature heating, simulating the influence of the long-term opening and closing of the vacuum interrupter, and improving the test of the vacuum interrupter Data Accuracy.

Description of drawings

Fig. 1 is a structural diagram of a vacuum interrupter in the related art;

Fig. 2 is a three-dimensional structural schematic diagram of Embodiment 1 of a vacuum interrupter test system for a transformer on-load tap-changer in the present application;

Fig. 3 is a cut-away plan view of the test box of Embodiment 1 of the vacuum interrupter test system for transformer on-load tap-changers of the present application;

Fig. 4 is an enlarged view of part A in Fig. 3;

Fig. 5 is a schematic diagram of the assembly relationship between the transmission rod and the moving conductive rod in Embodiment 1 of a vacuum interrupter test system for transformer on-load tap-changers of the present application;

Fig. 6 is an enlarged view of part B in Fig. 5;

Fig. 7 is a schematic block diagram of the circuit of Embodiment 1 of a vacuum interrupter test system for transformer on-load tap-changers of the present application;

Fig. 8 is a cut-away plan view of the test box of Embodiment 2 of the vacuum interrupter test system for transformer on-load tap-changers of the present application;

Fig. 9 is a schematic diagram of the assembly relationship of the fixed components of Embodiment 2 of a vacuum interrupter test system for transformer on-load tap-changers of the present application;

Fig. 10 is an enlarged view of part C of Fig. 8;

Fig. 11 is a flowchart of a test method for a vacuum interrupter for a transformer on-load tap changer according to the present application.

Explanation of reference signs:

1. Test box; 101. Inner box body; 102. Outer box body; 2. Cover plate; 3. First perforation; 4. Second perforation; 5. Seal; 501. First sealing sleeve; 502. Second Sealing sleeve; 6. Edge; 7. Elastic clip; 8. Card slot; 9. Sealing convex strip; 10. Sealing groove; 11. Fixing bolt; 12. Bracket; 13. Rotating shaft; 14. Transmission rod; 15. Sliding block; 16, sliding groove; 17, connecting block; 18, limit protrusion; 19, fastening bolt; 20, through hole; 21, threaded hole; 22, drive assembly; 221, cam; 222, motor 23, oil tank; 24, oil inlet pipe; 25, oil outlet pipe; 26, lower oil pipe; 27, oil pump; 28, valve; 29, heating wire; 30, control device; 301, temperature monitoring module; 3011, temperature detection sub-module ; 3012, temperature control submodule; 302, accumulation module; 3021, current detection submodule; 3022, processing module; 3023, counting submodule; 303, alarm module; 3031, counting and alarming submodule; 3032, temperature alarming submodule; 31. Vacuum interrupter; 311. Moving conductive rod; 312. Static conductive rod; 313. Moving contact; 314. Bellows; 315. Static end cover; 316. Moving end cover; 317. Shell; 318 , shielding cover; 32, first clamping block; 33, second clamping block; 34, inserting block; 35, cavity; 36, connecting plate; 37, sealing strip; 38, transparent observation window; 39, installation half Slot; 40, slot; 41, positioning block; 42, positioning slot; 43, positioning bolt; 44, first mounting hole; 45, second mounting hole; 46, first positioning hole; 47, second positioning hole; 48, positioning column.

Detailed ways

A vacuum interrupter test system and method for a transformer on-load tap changer of the present application and its method are described in detail below in conjunction with the accompanying drawings.

The application discloses a vacuum interrupter test system for a transformer on-load tap changer.

Example 1:

Referring to FIG. 2 and FIG. 3 , a vacuum interrupter test system for transformer on-load tap changer includes a test box 1 , and a vacuum interrupter 31 is detachably connected in the test box 1 . At the same time, the top cover of the test box 1 is provided with a cover plate 2 . The test box 1 comprises an inner box body 101 and an outer box body 102, the inner box body 101 is arranged in the outer box body 102, and the top of the inner box body 101 is connected with the top of the outer box body 102 by a connecting plate 36 so that the inner box body 101 A cavity 35 is formed between it and the outer box body 102 .

At the same time, a first perforation 3 is formed through a surface of the cover plate 2 in the thickness direction, and a second perforation 4 is perforated at the center of the inner bottom of the inner box 101 , and the first perforation 3 and the second perforation 4 are arranged coaxially. The inner bottom of the outer box 102 is connected with a connecting pipe, and the end of the connecting pipe away from the outer box 102 is fixedly connected with the inner box 101. The connecting pipe is arranged coaxially with the second through hole 4 and communicated with the second through hole 4 . The moving conductive rod 311 of the vacuum interrupter 31 penetrates through the first through hole 3 and extends out of the first through hole 3 , and the static conductive rod 312 of the vacuum interrupter 31 penetrates through the second through hole 4 and extends out of the second through hole 4 . In addition, the moving conductive rod 311 of the vacuum interrupter 31 is electrically connected to the positive pole of the external power supply, and the static conductive rod 312 is electrically connected to the negative pole of the power supply, so that the vacuum interrupter 31 is in the working state of power supply.

The four end corners of the cover plate 2 are all provided with fixing bolts 11 , and each fixing bolt 11 penetrates through the cover plate 2 and is threadedly connected with the connecting plate 36 , thereby fixing the cover plate 2 on the top of the test chamber 1 . After the cover plate 2 is fixed on the top of the test box 1, a surface of the cover plate 2 facing the inner bottom of the inner box 101 presses against the movable end cover plate 316 of the vacuum interrupter 31, and the inner bottom of the inner box 101 resists the vacuum. The static end cover plate 315 of the arc extinguishing chamber 31 thereby fixes the vacuum interrupting chamber 31 in the test chamber 1 . In addition, the top of the outer box 102 is bonded with sealing ribs 9 in the circumferential direction, and the sealing ribs 9 are arranged along the circumferential direction of the opening. A surface of the cover plate 2 that is in contact with the inner box 101 is circumferentially provided with a snap fit with the sealing ribs 9. The sealing groove 10 can improve the sealing performance between the test box 1 and the cover plate 2 in this way.

3 and 4, the first through hole 3 and the second through hole 4 are provided with a seal 5, the seal 5 includes a first seal sleeve 501 and a second seal sleeve 502, the first seal sleeve 501 and the second seal sleeve 502 are made of rubber material, the first sealing sleeve 501 is clamped in the first through hole 3 or the second through hole 4, the second sealing sleeve 502 is connected to one end of the first sealing sleeve 501, the second sealing sleeve 502 and the first The sealing sleeves 501 are coaxially arranged and communicated. One surface of the second sealing sleeve 502 connected to the first sealing sleeve 501 is in contact with the cover plate 2, and the surface of the other second sealing sleeve 502 connected to the first sealing sleeve 501 is in contact with the inner surface. The inner bottom of the box body 101 is in conflict.

At this time, the moving conductive rod 311 of the vacuum interrupter 31 passes through the first sealing sleeve 501 located in the first through hole 3 and extends out of the cover plate 2 , and the static conductive rod 312 passes through the first sealing sleeve located in the second through hole 4 501 and the connecting pipe extend out of the test chamber 1. The side walls of the moving conductive rod 311 and the static conductive rod 312 of the vacuum interrupter 31 are in contact with the inner side wall of the corresponding first sealing sleeve 501, and the second sealing sleeve 502 is far away from a surface of the first sealing sleeve 501 and The static end cover plate 315 and the movable end cover plate 316 are in contact to enhance the sealing between the first perforation 3 and the second perforation 4, so that the first perforation 3 or the second perforation 4 is not easy to seep oil, and it is the movable conductive rod 311 It plays an insulating role with the static conductive rod 312 .

It is worth mentioning that a sealing strip 37 is connected to the periphery of each second sealing sleeve 502 , and a surface of the sealing strip 37 close to the vacuum interrupter 31 is in contact with the surface of the casing 317 of the vacuum interrupter 31 . The surface of the second sealing sleeve 502 contacting the cover plate 2 or the inner bottom of the test box 1 is provided with three elastic clips 7, and the three elastic clips 7 are arranged along the circumference of the second sealing sleeve 502. Correspondingly, the cover plate 2 and The two opposite surfaces of the inner bottom of the inner box 101 are provided with three slots 8 that engage with the elastic clips 7, so that the sealing between the second sealing sleeve 502 and the cover plate 2 or the bottom of the inner box 101 can be further enhanced. sex.

2 and 3, the cover plate 2 is provided with a bracket 12. In this embodiment, the bracket 12 is vertically arranged and fixedly installed on a surface of the cover plate 2 away from the test box 1. The bracket 12 is located in the first through hole 3 side. At the same time, the end of the bracket 12 away from the cover plate 2 is rotatably connected with a transmission rod 14, and the transmission rod 14 is made of insulating material. Specifically, between the transmission rod 14 and the support 12, a rotating shaft 13 is arranged horizontally, and one end of the rotating shaft 13 away from the support 12 is fixedly connected to the midpoint of the length direction of the transmission rod 14, and the other end of the rotating shaft 13 is connected to One end of the bracket 12 away from the cover plate 2 is rotatably connected.

Referring to FIG. 5 and FIG. 6 , one end of the transmission rod 14 close to the first through hole 3 is connected to the moving conductive rod 311 of the vacuum interrupter 31 . Specifically, a connection block 17 is provided between the transmission rod 14 and the extending end of the moving conductive rod 311 of the vacuum interrupter 31, and a connecting block 17 is provided between the connecting block 17 and the extending end of the moving conductive rod 311 for fixing the moving conductive rod 311. Fasteners for rod 311. The side surface of the connecting block 17 away from the fastener is integrally formed with a sliding block 15, and the side surface of the transmission rod 14 close to the connecting block 17 is provided with a sliding groove 16, and the sliding groove 16 is along the length direction of the transmission rod 14 It is provided that the sliding block 15 is inserted into the sliding groove 16 and is slidably matched with the sliding groove 16 , so that the transmission rod 14 drives the conductive rod 311 . In order to make the sliding block 15 difficult to break away from the sliding groove 16, two opposite groove walls of the sliding groove 16 are provided with two limiting protrusions 18 for limiting the position of the sliding block 15, and the two limiting protrusions 18 are respectively glued It is connected to the end of the sliding groove 16 near the notch and is arranged along the length direction of the sliding groove 16. At this time, the two surfaces in the thickness direction of the sliding block 15 are respectively in contact with the position of the limiting convex strip 18 and the bottom of the sliding groove 16. surface.

The above-mentioned fasteners are fastening bolts 19, the extended end of the moving conductive rod 311 of the vacuum interrupter 31 is provided with a through hole 20, and a surface of the connecting block 17 far away from the sliding block 15 is provided with a threaded hole 21. The bolt 19 passes through the through hole 20 and is threadedly connected with the threaded hole 21 , thereby connecting the moving conductive rod 311 of the vacuum interrupter 31 and the transmission rod 14 together. When the moving conductive rod 311 of the vacuum interrupter 31 needs to be separated from the transmission rod 14, only the fastening bolt 19 needs to be separated from the threaded hole 21, and the operation is simple.

5, it should be noted that the cover plate 2 is also provided with a drive assembly 22 for driving the transmission rod 14 to reciprocate up and down. In this embodiment, the drive assembly 22 includes a cam 221 and a motor 222, and the motor 222 is fixedly mounted on The cover plate 2 faces away from a surface of the test box 1 and is located at the end of the transmission rod 14 away from the moving conductive rod 311 . The cam 221 is fixedly sleeved on the output shaft of the motor 222 , the cam 221 is located above the transmission rod 14 , and the side wall of the cam 221 is in contact with the end of the moving conductive rod 311 of the transmission rod 14 away from the vacuum interrupter 31 .

Referring to Fig. 3 and Fig. 6, by starting the motor 222, the cam 221 is rotated, the transmission rod 14 at this time swings up and down around the rotating shaft 13, and the sliding block 15 slides back and forth in the sliding groove 16, due to the first The perforation 3 limits the moving direction of the movable conductive rod 311, so that the movable conductive rod 311 moves linearly up and down, so the connecting block 17 drives the movable conductive rod 311 to move up and down in the first perforated hole 3, so as to automatically move the vacuum interrupter 31. The conductive rod 311 moves up and down, so as to realize the mechanical opening and closing of the vacuum interrupter 31, so as to simulate the opening and closing of the vacuum interrupter.

Specifically, when the transmission rod 14 is pressed by the cam 221 and swings downward, the end of the transmission rod 14 connected to the movable conductive rod 311 of the vacuum interrupter 31 will swing upward, thereby making the movable conductive rod of the vacuum interrupter 31 311 is lifted and moved upwards, at this time, the two movable contacts 313 in the vacuum interrupter 31 will be separated, so that the vacuum interrupter 31 is in a disconnected state.

When the transmission rod 14 is pushed upward by the cam 221 and swings upwards, the end of the transmission rod 14 connected to the movable conductive rod 311 of the vacuum interrupter 31 swings downward. The moving contact 313 of the moving conductive rod 311 moves downward until the two moving contacts 313 touch, and at this time the vacuum interrupter 31 is energized and is in a working state.

Referring to Figure 2 and Figure 3, the system also includes an oil tank 23 for storing insulating oil, a transparent observation window 38 is provided on the side wall of the oil tank 23, and a transparent plate is installed in the transparent observation window 38 to observe the oil level in the oil tank 23, The top of the oil tank 23 is communicated with a lower oil pipe 26 so as to replenish insulating oil. The opposite inner sidewalls of the inner box 101 are respectively connected with an oil inlet pipe 24 and an oil outlet pipe 25 for the insulating oil to enter the inner box 101. The oil inlet pipe 24 is located on the side of the test box 1 near the top of the inner box 101, and The oil tank 23 communicates with the test chamber 1 through the oil inlet pipe 24, and the oil outlet pipe 25 is located at the end of the inner box body 101 near the inner bottom of the inner box body 101. . In addition, an oil pump 27 is installed at the oil inlet pipe 24 , and a valve 28 is installed on the oil outlet pipe 25 .

When it is necessary to inject insulating oil into the test box 1, start the oil pump 27 installed on the oil inlet pipe 24, close the valve 28 on the oil outlet pipe 25, and the oil tank 23 injects insulating oil into the inner box 101 through the oil inlet pipe 24, so that the insulating oil Submerging the casing 317 of the vacuum interrupter 31 can turn off the oil pump 27 to reduce the influence of the external electromagnetic environment on the vacuum interrupter 31 . When the test is completed and the insulating oil needs to be drained away, the insulating oil can be drained only by opening the valve 28 installed on the oil outlet pipe 25.

Referring to Fig. 3, in order to monitor the working environment of the simulated vacuum interrupter 31 in the test box 1 in real time, the test box 1 is also provided with a control device 30 and a control power supply for supplying power to the control device. There is a heating element for heating the insulation, in this embodiment, the heating element is a heating wire group 29 . The heating wire group 29 includes a plurality of heating wires, and the input end and the output end of the heating wire group are respectively the parallel input end and the parallel connection output end of the parallel connection of the plurality of heating wires. A plurality of heating wires are respectively fixedly installed on the four outer walls of the inner box 101 , the bottom of the inner box 101 , and a surface of the cover plate 2 close to the inner box 101 , so that the insulating oil is heated evenly.

At the same time, referring to FIG. 7, the control device 30 includes a temperature monitoring module 301. In this embodiment, the temperature monitoring module 301 includes a temperature detection submodule 3011 and a temperature control submodule 3012. The temperature detection submodule 3011 can be a temperature sensor, specifically It can be an NTC temperature sensor, and the temperature control sub-module 3012 is a controller.

The temperature detection sub-module 3011 is installed on the inner wall of the outer box 102 , and the temperature control sub-module 3012 is installed on the outer wall of the outer box 102 . The temperature detection sub-module 3011 is used to detect the heating temperature of the insulating oil, and the temperature control sub-module 3012 is used to receive and process abnormal temperature signals from the temperature sensor. The abnormal temperature signals include abnormal temperature rise signals and abnormal temperature drop signals. The input end of the temperature control submodule 3012 is electrically connected to the temperature detection submodule, the output end of the temperature control submodule 3012 is electrically connected to the parallel input end of the heating wire group 29, and the parallel output end of the heating wire group 29 is electrically connected to the control power supply.

The temperature control sub-module 3012 monitors the temperature of the insulating oil in real time. When the temperature control sub-module 3012 detects that the temperature of the insulating oil is higher than the preset temperature value, the temperature control sub-module 3012 will generate an abnormal temperature rise signal and send it to the temperature control sub-module. Module 3012, the temperature control sub-module 3012 receives an abnormal temperature rise signal from the temperature control sub-module 3012, then the temperature control sub-module 3012 processes the abnormal temperature rise signal and controls the heating wire group 29 to stop heating.

When the temperature control sub-module 3012 detects that the temperature of the insulating oil in the test chamber 1 is lower than the preset temperature value, the temperature control sub-module 3012 will generate an abnormal temperature drop signal and send it to the temperature control sub-module 3012, the temperature control sub-module 3012 receives an abnormal temperature drop signal from the temperature control sub-module 3012, then the temperature control sub-module 3012 processes the abnormal temperature drop signal and controls the heating wire group 29 to heat. In this way, the actual thermal working environment of the vacuum interrupter 31 can be simulated, so that the simulated thermal working environment is at a stable temperature value.

Referring to Fig. 7, in order to automatically calculate the number of opening and closing tests of the vacuum interrupter 31, the control device 30 also includes an accumulation module 302, the accumulation module 302 includes a processing sub-module 3022, a current detection sub-module 3021 and a counting sub-module 3023, the processing sub-module The module 3022 , the current detection sub-module 3021 and the counting sub-module 3023 are all arranged on the outer wall of the outer box 102 . Specifically, the current detection sub-module 3021 can be an AC current detection module, the processing sub-module 3022 can be a processor, and the counting sub-module 3023 can be a counter. The current detection sub-module 3021 is used to detect the current value when the vacuum interrupter 31 is opened and closed and sends out a current abnormal signal, the processing sub-module 3022 is used to receive and process the current abnormal signal output from the current detection sub-module 3021, and the counting sub-module 3023 is used to accumulate the opening and closing times of the vacuum interrupter 31 .

The load input end of the current detection sub-module 3021 is electrically connected to the positive pole of the external power supply, the load output end of the current detection sub-module 3021 is electrically connected to the moving conductive rod 311 of the vacuum interrupter 31, and the signal output end of the current detection sub-module 3021 It is electrically connected to the input end of the processing sub-module, the output end of the processing sub-module 3022 is electrically connected to the input end of the counting sub-module 3023, and the output end of the counting sub-module 3023 is electrically connected to the control power supply.

The current detection sub-module 3021 detects the working current of the vacuum interrupter 31 in real time and sends it to the processor. The current detection sub-module 3021 detects that the two consecutive working currents are equal to the preset current value, that is, the first current value detection When the vacuum interrupter 31 is at a normal operating current value, the second current detection sub-module 3021 detects that the operating current in the vacuum interrupter 31 is 0, which indicates that the vacuum interrupter 31 has completed opening and closing once.

When the current detection sub-module 3021 detects that the two consecutive operating currents are equal to the preset current value, an abnormal current signal is generated and sent to the processing sub-module 3022, and the processing sub-module 3022 receives the current abnormality sent by the current detection sub-module 3021 signal and process the current abnormal signal, and the processing submodule 3022 controls the counting submodule 3023 to accumulate the number of trials once. When the number of trials accumulated by the counting submodule 3023 reaches the preset number of times, a counting completion signal is generated and sent to the processing submodule, and the processing submodule receives the counting completion signal sent by the counting submodule 3023, and the control motor 222 stops working , and the test is completed.

If the current detection sub-module 3021 detects that any of the two consecutive operating currents is not equal to the preset current value, it indicates that the simulated opening and closing of the vacuum interrupter 31 is abnormal, and an abnormal current signal is generated and sent to the processing sub-module 3022 , the processing submodule 3022 controls the counting submodule to stop counting.

In order to remind the staff in time that the test is completed, the control device also includes an alarm module 303 , and the alarm module 303 also includes a counting alarm sub-module 3031 and a temperature alarm sub-module 3032 . Specifically, the counting alarm sub-module 3031 includes a first alarm and a second alarm, both of which are installed on the outer side wall of the outer box 102, and both of the first alarm and the second alarm are The sound alarm, the input terminal of the first alarm and the output of the second alarm are all electrically connected to the output of the processing submodule 3022. When the counting submodule accumulates a preset number of times, the processing submodule 3022 will control the second alarm. An alarm sounds to remind the staff that the test is completed in time. When the current detection sub-module 3021 detects that any of the two consecutive operating currents is not equal to the preset current value, it indicates that the opening and closing of the vacuum interrupter 31 is abnormal, and the control sub-module controls the counting sub-module 3023 to stop counting, and controls the first Two alarms sounded.

In addition, the temperature alarm sub-module 3032 is a third alarm, the third alarm is installed on the outer wall of the outer box 102, the third alarm is a light alarm, the input end of the third alarm is connected to the temperature control sub-module 3012 The output end is electrically connected. When the temperature detection sub-module 3011 detects that the temperature of the insulating oil is higher or lower than the preset temperature value, the temperature control sub-module 3012 will control the third alarm to flash to remind the staff to heat The heating temperature of silk group 29 is abnormal.

The implementation principle of Example 1 of the present application is as follows: by setting the heating wire group 29 and the heating power supply in the test box 1 to heat the insulating oil installed in the test box 1, and at the same time, the vacuum interrupter 31 is energized, and the drive assembly 22 Make the conductive rod swing up and down, move the conductive rod 311 up and down to mechanically open and close the vacuum interrupter 31, and control the heating wire group 29 to heat through the control device 30. The accumulative module 302 of the control device 30 controls the vacuum interrupter 31 The opening and closing times of the vacuum interrupter 31 can be counted, so that the vacuum interrupter 31 can be placed in a energized and constant temperature working environment to simulate the actual dynamic working environment of the vacuum interrupter 31 to test the opening and closing of the vacuum interrupter 31, In this way, the accuracy of the test of the vacuum interrupter 31 can be improved, the error of the performance data of the subsequent test of the vacuum interrupter 31 can be reduced, and the operation is simple.

Example 2:

Referring to Figures 8 and 9, the difference from Embodiment 1 is that the system also includes a fixing assembly for fixing the vacuum interrupter, the fixing assembly includes a first clamping block 32 and a second clamping block 33, the first clamping The holding block 32 and the second holding block 33 are all arranged in an arc shape, and the opposite sides of the first holding block 32 and the second holding block 33 are provided with an installation half groove 39, and two installation half grooves 39 are formed for The installation groove for installing the vacuum interrupter 31 , and the inner sidewall of the first clamping block 32 and the inner sidewall of the second clamping block 33 are in contact with the vacuum interrupter 31 .

Both ends of the first clamping block 32 are integrally formed with inserting blocks 34, and both ends of the second clamping block 33 are provided with slots 40, and each inserting block 34 is plugged and matched with the corresponding slot 40. The first clamping block 32 and the second clamping block 33 are preliminarily spliced together, and the two ends of the first clamping block 32 are all provided with mounting bolts, and each slot 40 is far away from a groove wall of the half groove 39 for installation. The first mounting hole 44, a surface of each plug 34 is provided with a second mounting hole 45 corresponding to the mounting bolt, and each mounting bolt passes through the first mounting hole 44 and is threadedly connected with the second mounting hole 45, thus the second mounting hole 45 is threaded. A clamping block 32 and a second clamping block 33 are fixed together, so that the first clamping block 32 and the second clamping block 33 clamp the vacuum interrupter 31 .

Referring to FIG. 9 and FIG. 10 , two positioning blocks 41 are fixedly installed on the inner bottom of the inner box 101 , and the two positioning blocks 41 are respectively arranged on both sides of the second through hole 4 . The outer walls of the first clamping block 32 and the second clamping block 33 are integrally formed with four positioning posts 48 corresponding to the positioning block 41, and the four positioning posts 48 are positioned along the first clamping block 32 or the second clamping block. The arc length directions of the blocks 33 are arranged sequentially, and each positioning block 41 is provided with a positioning groove 42 at the end far away from the inner bottom of the test chamber 1. In the test box 1, the static conductive rod 312 passes through the second through hole 4 and is fixed. Each positioning block 41 is provided with a positioning bolt 43, the positioning groove 42 is provided with a first positioning hole 46 on a groove wall far away from the vacuum interrupter 31, and a second positioning hole 47 is opened on a surface of the positioning block 41. The positioning bolts 43 passes through the first positioning hole 46 and is threadedly connected with the second positioning hole 47, thereby stably fixing the vacuum interrupter 31 on the bottom of the test chamber 1 to reduce the shaking of the vacuum interrupter 31 during the test.

The implementation principle of Embodiment 2 of the present application is: clamp the vacuum interrupter 31 through the first clamping block 32 and the second clamping block 33, and insert and cooperate with the positioning groove 42 through the positioning column 48, and use the positioning bolt 43 The positioning column 48 is fixed to the positioning groove 42, thereby stably fixing the vacuum interrupter 31 together, so as to reduce the shaking of the vacuum interrupter 31 during the test.

The application discloses a test method for a vacuum interrupter system of an on-load tap changer for a transformer.

Referring to Figure 11, a vacuum interrupter test method, the specific steps are as follows:

S1. Install the sample of the vacuum interrupter 31 to be tested in the test chamber 1, so that the static conductive rod 312 of the vacuum interrupter 31 extends from the second perforation 4 to the outside of the test chamber 1, and the dynamics of the vacuum interrupter 31 The conductive rod 311 protrudes from the first through hole 3 to the outside of the cover plate 2 .

Specifically, before the sample of the vacuum interrupter 31 to be tested is installed in the test chamber 1, according to the actual use of the vacuum interrupter 31, insulating oil with the same label as the insulating oil used in the transformer is prepared.

S2. Connect the extending end of the moving conductive rod 311 of the vacuum interrupter 31 to the transmission rod 14, start the motor 222 installed on the cover plate 2, and debug the test device.

Specifically, set the opening and closing speed of the vacuum interrupter 31 to 0.7 m/s, and the frequency to 13 times/minute, and check whether the connection between the transmission rod 14 and the moving conductive rod 311 is stable.

S3. After S2 is completed, inject insulating oil into the test chamber 1 to make the insulating oil immerse the housing 317 in the vacuum interrupter 31 .

Specifically, in order to quickly heat up the insulating oil to the required temperature, the insulating oil can be heated to a certain temperature in advance, such as 35 degrees Celsius. The personnel can start the valve 28 to make the insulating oil in the oil tank 23 enter the test chamber 1 through the oil inlet pipe 24 until the insulating oil in the test chamber 1 reaches the preset oil level, then stop injecting the insulating oil into the test chamber 1.

S4. The heating wire group 29 is energized, the heating wire group 29 heats the insulating oil, connects the power supply to the vacuum interrupter 31, and makes the vacuum interrupter 31 in a working state.

Specifically, the temperature of the insulating oil can be maintained at 70 degrees Celsius, so that the vacuum interrupter 31 is in a relatively stable thermal simulation working environment. At the same time, connect the power supply to the vacuum interrupter 31, apply a working current to the vacuum interrupter 31, and the operating current can be 1300A, and make the vacuum interrupter 31 open and close in an electrified and thermally simulated working environment.

S5. Set the target test times, start the motor 222 installed on the cover plate 2, and rotate the cam 221 installed on the output shaft of the motor 222, so that the transmission rod 14 drives the conductive rod 311 to move up and down to mechanically open the vacuum interrupter 31 close, and accumulate the opening and closing times in the vacuum interrupter 31.

S6. When the number of tests reaches the preset number of times, turn off the control power supply, take out the sample of the vacuum interrupter 31 for performance testing according to relevant standards, and record relevant test data.

Specifically, perform performance tests on the vacuum interrupter 31 in accordance with relevant standards, such as the wear of the moving contact 313 and the degree of vacuum to evaluate the quality of the vacuum interrupter 31 and improve the accuracy of the data.

The implementation principle of a vacuum interrupter test method for transformer on-load tap-changers in this application: the actual dynamic working environment is simulated by heating insulating oil and electrification, and the vacuum interrupter 31 is placed in a simulated working environment of electrification and constant temperature heating , to simulate the influence of the long-term opening and closing of the vacuum interrupter 31, and improve the accuracy of the test data of the vacuum interrupter 31.

The above-mentioned embodiments are just to illustrate the technical concept and features of the present application, and the purpose is to enable those of ordinary skill in the art to understand the content of the present application and implement it accordingly, and not to limit the protection scope of the present application. All equivalent changes or modifications made according to the essence of the content of the application shall fall within the scope of protection of the application.

Claims (10)

1. A vacuum interrupter test system for on-load tap-changers for transformers, comprising a test box (1), characterized in that the vacuum interrupter (31) is detachably connected to the test In the box (1), the top of the test box (1) is provided with a cover plate (2), the cover plate (2) is provided with a first perforation (3), and the bottom of the test box (1) is provided with a The second perforation (4), the moving conductive rod (311) of the vacuum interrupter (31) passes through the first perforation (3) and extends out of the first perforation (3), the vacuum interrupter The static conductive rod (312) of the chamber (31) passes through the second perforation (4) and extends outside the second perforation (4), and the dynamic conductive rod (311) of the vacuum interrupter (31) The protruding end is connected with the protruding end of the static conduction rod (312) and the external power supply, and insulating oil is housed in the test chamber (1), and the insulating oil is immersed in the shell of the vacuum interrupter (31) (317), the test box (1) is provided with a heating element for heating the insulating oil, and the test box (1) is provided with a control device (30) for controlling the heating of the heating element and a control power supply, the The control power supply is electrically connected with the control device (30), the top of the test box (1) is provided with a support (12), and the support (12) is rotatably connected with a transmission rod (14), and the transmission rod ( One end of 14) is connected to the moving conductive rod (311), and the end of the cover plate (2) away from the moving conductive rod (311) is provided with a driving assembly (22) for driving the moving conductive rod to move up and down.
2. A vacuum interrupter test system for on-load tap-changers for transformers according to claim 1, characterized in that: the drive assembly (22) includes a cam (221) and a motor (222) ), the motor (222) is arranged on the cover plate (2), the cam (221) is fixedly sleeved on the output shaft of the motor (222) and is located above the transmission rod (14) , the side wall of the cam (221) interferes with the end of the transmission rod (14) away from the moving conductive rod (311).
3. A vacuum interrupter test system for transformer on-load tap changer according to claim 1, characterized in that: the heating element is a heating wire group (29), and the heating wire group (29) is arranged on the On the inner wall of the test box (1) and the cover plate (2), the input end of the heating wire group (29) is connected to the control device (30), and the output of the heating wire group (29) connected to the control power supply.
4. A vacuum interrupter test system for transformer on-load tap changer according to claim 3, characterized in that: the control device (30) includes a temperature monitoring module (301), and the temperature monitoring module (301) includes a temperature A detection submodule (3011) and a control submodule, the temperature detection submodule (3011) is set on the test box (1), and the temperature monitoring module (301) is used to detect the temperature of the insulating oil and generate For a temperature abnormal signal, the temperature monitoring module (301) is electrically connected to the input end of the control submodule, and the output end of the control submodule is electrically connected to the input end of the heating wire group (29).
5. A vacuum interrupter test system for transformer on-load tap changer according to claim 4, characterized in that: the control device (30) also includes an alarm module (303), the input terminal of the alarm module (303) It is connected with the output end of the control sub-module.
6. The vacuum interrupter test system for transformer on-load tap changer according to claim 1, characterized in that: the control device (30) also includes an accumulation module (302), and the accumulation module (302) includes The processing submodule (3022), the current detection submodule (3021) and the counting submodule (3033), the processing submodule (3022), the current detection submodule (3021) and the counting submodule (3033) are all Set on the test box (1), the current detection sub-module (3021) is used to detect the current when the vacuum interrupter (31) is opened and closed and sends out a current detection signal, and the processing sub-module (3022) uses For receiving and processing the current detection signal output from the current detection sub-module (3021), the counting sub-module (3033) is used to accumulate the number of opening and closing of the vacuum interrupter (31), and the current detection sub-module The signal output end of (3021) is connected with the input end of described processing submodule (3022), and described counting submodule (3033) and described driving component (22) are all connected with the output end of described processing submodule (3022). electrical connection.
7. A vacuum interrupter test system for transformer on-load tap-changers according to claim 1, characterized in that: the top of the test box (1) is provided with sealing ribs (9) in the circumferential direction, and the cover plate (2) is provided with a sealing groove (10) in which the sealing protrusion (9) is clamped and fitted.
8. A vacuum interrupter test system for transformer on-load tap changer according to claim 1, characterized in that: a connecting block ( 17), one end of the connection block (17) is connected with a sliding block (15), and the transmission rod (14) is close to the sliding groove at one end of the moving conductive rod (311) of the vacuum interrupter (31) (16), the sliding block (15) is slidingly matched with the sliding groove (16), and the connecting block (17) is arranged with the moving conductive rod (311) of the vacuum interrupter (31) There are fasteners for fixing the moving conductive rod (311) of the vacuum interrupter (31).
9. A vacuum interrupter test system for transformer on-load tap changer according to claim 8, characterized in that: the fasteners are fastening bolts (19), and the vacuum interrupter (31) A through hole (20) is provided on the movable conductive rod (311), a threaded hole (21) is provided at the end of the connecting block (17) away from the sliding block (15), and the fastening bolt (19) penetrates The through hole (20) is threadedly connected with the threaded hole (21).
10. A method for testing a vacuum interrupter for a transformer on-load tap changer, the specific steps of which are as follows:

    S1. Install the sample of the vacuum interrupter (31) to be tested in the test chamber (1), so that the static conductive rod (312) of the vacuum interrupter (31) extends from the second perforation (4) to the test chamber Outside (1), the moving conductive rod (311) of the vacuum interrupter (31) protrudes from the first through hole (3) to the outside of the cover plate (2);

    S2. Connect the extending end of the moving conductive rod (311) of the vacuum interrupter (31) to the transmission rod (14), start the motor (222) installed on the cover plate (2), and debug the test device;

    S3. After S2 is completed, inject insulating oil into the test chamber (1), so that the insulating oil is immersed in the housing (317) in the vacuum interrupter (31) 31;

    S4, the heating wire group (29) is energized, the heating wire group (29) heats the insulating oil, and the power supply is connected to the vacuum interrupter (31), so that the vacuum interrupter (31) is in a working state;

    S5, set the target number of tests, start the motor (222) installed on the cover plate (2), make the cam (221) installed on the output shaft of the motor (222) rotate, so that the transmission rod (14) drives the conductive rod ( 311) move up and down to mechanically open and close the vacuum interrupter (31), and accumulate the opening and closing times in the vacuum interrupter (31);

    S6. When the number of tests reaches the preset value, turn off the control power supply, take out the sample of the vacuum interrupter (31) for performance testing according to relevant standards, and record relevant test data.

Images