A special arc extinguishing chamber for switching reactor and its use method

Abstract

The present invention relates to an arc extinguishing chamber dedicated to a switching reactor and a method of using the same, wherein the arc extinguishing chamber dedicated to a switching reactor comprises an arc extinguishing chamber unit, a fast closing unit and a resistor-capacitor unit, the arc extinguishing chamber unit comprises a first insulating support tube fixedly connected with a first static contact unit and a first moving contact unit, the first static contact unit comprises a first static contact, and the first moving contact unit comprises a first moving contact arranged opposite to the first static contact; the fast closing unit comprises a second insulating support tube and a second moving contact slidably connected in the second insulating support tube, a transmission device connected to a transmission rod and driving the second moving contact to move is provided in the second insulating support tube, and a compressible static contact electrically connected to the resistor-capacitor unit is provided in the fixed seat. When the arc extinguishing chamber unit of the present invention is disconnected, the overvoltage generated during disconnection is reduced due to the input of the resistor-capacitor unit, and the generation of re-breakdown and re-ignition is avoided; when closed, the resistor-capacitor unit is isolated, and the service life of the resistor-capacitor unit is increased.

Description

Technical Field

[0001] The invention relates to the technical field of high-voltage switchgear, and in particular to an arc extinguishing chamber dedicated to a switching reactor and a use method thereof. Background Art

[0002] Shunt reactors installed in power systems are used to absorb reactive power and ensure voltage stability. Shunt reactors are directly connected to the power grid or connected in series to the balance winding of the transformer, and are usually switched directly by circuit breakers. When the circuit breaker switches the reactor, there is always a certain number of overvoltages due to the frequent switching times and the special structure of the reactor. CIGRE's recent reliability survey report pointed out that for every 100 switching times of the circuit breaker on the high-voltage shunt reactor side, there will be nearly 2.5 major switching failures. One of the reasons is electrical. Since the circuit breaker is used to cut off the maximum short-circuit current, its huge arc extinguishing ability will also act on cutting off low inductive current loads, which causes the arc to be cleared in advance before the current overflows. In view of this, in the reactor circuit, a very small inductive current is cut off, and a voltage difference is generated between the breaks after the arc is extinguished. Since the phase angle of the current lags behind the voltage by 90 degrees, the voltage is exactly the highest when the current overflows. The voltage caused by the current cutoff and the natural recovery voltage on the opposite side of the break are superimposed, which is very likely to cause breakdown and reignition of the contacts and gaps.

[0003] The breakdown and reignition of the gap will lead to the generation of overvoltage, which usually has a very high frequency. Due to the generation of high-frequency overvoltage, it will act unevenly on the first few turns of the reactor coil, resulting in problems such as inter-turn breakdown, and damage the reactor. Therefore, there is an urgent need for a new type of circuit breaker for switching reactors, and the core part of the circuit breaker is the arc extinguishing chamber. Therefore, it is very necessary to invent an arc extinguishing chamber dedicated to switching reactors. Summary of the invention

[0004] In view of the above technical problems, the present invention provides an arc extinguishing chamber dedicated to switching reactors and a method of using the same, so as to solve the problems of high breakdown probability and easy occurrence of overvoltage in the existing arc extinguishing chamber when used to switch reactors.

[0005] The present invention is implemented through the following technical scheme, providing an arc extinguishing chamber dedicated to a switching reactor, comprising an arc extinguishing chamber unit, a fast closing unit and a resistance-capacitance unit arranged in sequence,

[0006] The arc extinguishing chamber unit includes a first insulating support cylinder with a first static contact unit fixedly connected at one end and a first moving contact unit slidably arranged in the first insulating support cylinder, the other end of the first insulating support cylinder is fixedly connected to the fast closing unit, the first static contact unit includes a first static contact fixedly arranged, the first moving contact unit includes a first moving contact axially arranged opposite to the first static contact, and a transmission pull rod fixedly connected to the first moving contact, the transmission pull rod is fixedly connected to the insulating pull rod connected to the operating mechanism;

[0007] The quick closing unit includes a second insulating support tube fixedly connected to the first insulating support tube at one end, a fixed seat fixedly connected to the other end of the second insulating support tube, and a second moving contact slidably connected in the second insulating support tube. The second insulating support tube is provided with a transmission device connected to a transmission rod and driving the second moving contact to move axially. The fixed seat is provided with a compressible static contact axially opposite to the second moving contact, and the compressible static contact is electrically connected to the resistor-capacitor unit.

[0008] When the present solution is in use, the insulating pull rod is connected to the operating mechanism. When the arc extinguishing chamber unit is opened, the action of the operating mechanism drives the first moving contact to move away from the first static contact through the transmission of the insulating pull rod. At the same time, the second moving contact is moved toward the compressible static contact through the force transmitted by the transmission device. When the arc extinguishing chamber unit is closed, the operating mechanism acts in the opposite direction, drives the first moving contact to move toward the first static contact, and at the same time, the second moving contact moves away from the compressible static contact. This achieves that when the arc extinguishing chamber unit is closed, the fast closing unit is opened to separate the RC unit from the high-voltage line. When the arc extinguishing chamber unit is opened, the fast closing unit is closed to put the RC unit into operation, so as to limit the generation of overvoltage and improve the reliability of the operation of the power system.

[0009] As an optimization, the transmission device includes a transmission shaft fixed to the transmission pull rod and a crank arm hinged to the second insulating support tube at one end, the other end of the crank arm is hinged to a connecting arm, the connecting arm is hinged to the second moving contact, the side of the crank arm away from the connecting arm is connected to the second insulating support tube through a disconnecting spring, a guide wheel is installed at one end of the transmission shaft facing the crank arm, and a step opposite to the guide wheel is provided on the side of the crank arm. The transmission device of this optimization scheme adopts a connecting rod structure. When the transmission shaft moves, the guide wheel pushes the crank arm to rotate, thereby driving the connecting arm to push the second moving contact to move. The structure is simple. By setting a disconnecting spring, when the arc extinguishing chamber unit is closed, the disconnecting spring is used to pull the crank arm to rotate, so that the second moving contact moves away from the compressible static contact. At the same time, the hysteresis effect of the disconnecting spring is used to realize the slow disconnection of the fast closing unit, thereby completing the disconnection of the resistor-capacitor unit.

[0010] As an optimization, a partition is provided in the second insulating support cylinder, and a guide hole adapted to the second moving contact is opened on the partition. This optimization scheme provides support and guidance for the second moving contact by providing the partition and the guide hole, thereby improving the reliability of the contact between the second moving contact and the compressible static contact.

[0011] As an optimization, the RC unit includes a conductive plate fixed to the fixed seat, the compressible static contact passes through the conductive plate and contacts the conductive plate, and the conductive plate and the compressible static contact are also connected by a second conductive spring. This optimization scheme conducts electricity to the conductive plate through the compressible static contact, and by providing the second conductive spring, the second conductive spring is used to compress the conductive plate and the compressible static contact, so that the contact is tighter and the conductivity reliability is better.

[0012] As an optimization, the compressible static contact is slidably connected with the fixed seat, and a compression spring is sleeved on the compressible static contact, one end of the compression spring is pressed against the conductive plate, and the other end is pressed against the limit table set on the compressible static contact. The structural setting of this optimization scheme allows the compressible static contact to move under the action of the second moving contact. After the second moving contact contacts the compressible static contact, the arc extinguishing chamber unit can continue the opening operation, and the fast closing unit maintains the closed state unchanged. When the arc extinguishing chamber unit is about to perform the closing action, when the first moving contact just starts to move, the fast closing unit performs an idle stroke and does not move, so that the fast closing unit is still in the closed state.

[0013] As an optimization, the RC unit includes a conductive plate and a first fixed plate fixed by an insulating plate, and an insulating rod passing through the conductive plate and the first fixed plate. The insulating rod between the conductive plate and the first fixed plate is sleeved with an adjustment block, a first pressure block, a second pressure block and a clamping spring in sequence. A plurality of resistors sleeved on the insulating rod are also arranged between the first pressure block and the second pressure block. The resistors are connected to the first fixed plate by a wire, and the first fixed plate is connected to the grounded fixed plate by a capacitor. The RC unit of this optimization solution makes each resistor in close contact through the action of the clamping spring to ensure the conduction effect, and the number of resistors can be replaced according to actual needs.

[0014] This solution also provides a method for using an arc extinguishing chamber dedicated to switching reactors, including the following aspects:

[0015] 1. When performing the opening operation, the operating mechanism drives the first moving contact to move away from the first static contact through the insulating pull rod, and at the same time pushes the second moving contact to move toward the compressible static contact through the transmission device;

[0016] When the first moving contact and the first static contact of the arc extinguishing chamber unit are in the just-opened position, the second moving contact of the fast closing unit faces the compressible static contact in the just-closed position;

[0017] When the arc extinguishing chamber unit continues to perform the opening operation, the second moving contact of the fast closing unit continues to move and performs the closing operation until the guide wheel loses its function. At this time, the arc extinguishing chamber unit continues to perform the opening operation, while the fast closing unit has already closed in place and will not close any more;

[0018] 2. When executing the closing command, the operating mechanism drives the first moving contact toward the first static contact through the insulating pull rod. When the first moving contact of the arc extinguishing chamber unit just moves, the fast closing unit executes the idle stroke and does not move. When the guide wheel retreats to the point where it no longer acts on the crank arm, the crank arm begins to perform the opening operation under the action of the opening spring. When the arc extinguishing chamber unit is fully closed to the bottom, due to the spring hysteresis of the fast closing unit, the fast closing unit slowly opens and completes the disconnection of the RC unit. When disconnecting the reactor, the RC unit is put into operation in time to limit the overvoltage of the opening and prevent the occurrence of heavy breakdown and reignition between the arc extinguishing chamber breaks; after the reactor is put into operation, the separation of the contacts in the fast closing unit is used to isolate the RC unit and no longer put it into the power grid system, thereby increasing the service life of the RC unit.

[0019] The beneficial effects of the present invention are as follows: when the arc extinguishing chamber unit is disconnected, the overvoltage generated during the disconnection is reduced due to the input of the resistor-capacitor unit, thereby avoiding the occurrence of restrike and restrike; when closing, the resistor-capacitor unit is isolated through the disconnection operation of the fast closing unit, thereby increasing the service life of the resistor-capacitor unit. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 It is a schematic diagram of the structure of the present invention when the switch is closed;

[0021] Figure 2 yes Figure 1 Schematic diagram of the state of the middle transmission device;

[0022] Figure 3 It is a schematic diagram of the top view of the structure of the present invention when the gate is open;

[0023] Figure 4 It is a schematic diagram of the structure of the present invention when the gate is opened;

[0024] Figure 5 yes Figure 4 A schematic diagram of the structure of the first static contact unit;

[0025] Figure 6 yes Figure 4 A schematic diagram of the structure of the first moving contact unit;

[0026] Figure 7 yes Figure 4 Schematic diagram of the state of the middle transmission device;

[0027] Figure 8 yes Figure 4 Schematic diagram of the internal structure of the middle fixed seat;

[0028] Fig. 9 yes Figure 4 Schematic diagram of the structure of the medium resistance and capacitance unit;

[0029] As shown in the figure:

[0030] 1. Arc extinguishing chamber unit, 2. Fast closing unit, 3. RC unit, 4. First static contact unit, 5. First insulating support cylinder, 6. First moving contact unit, 7. Second moving contact unit, 8. Second insulating support cylinder, 9. Compressible static contact, 10. Resistance unit, 11. Capacitor unit, 12. Insulating pull rod, 13. Transmission arm, 14. First outlet seat, 15. Static contact support seat, 16. First static arc contact, 17. Guide cylinder, 18. Contact finger fixing seat, 19. First outer support ring, 20. First static main contact, 21. Insulating support cylinder, 22. Large nozzle, 23. First moving main contact, 24. Outer support seat, 25. Second outlet seat, 26. Disconnection spring, 27. Transmission mechanism chamber, 28. Guide wheel, 29. Guide belt, 30. Second moving contact, 31. Insulating cylinder, 32. The second outer support ring, 33, the second static contact, 34, the second guide belt, 35, the phase-locked loop, 36, the conductive plate, 37, the adjustment block, 38, the second pressure block, 39, the insulating rod, 40, the compression spring, 41, the first fixed plate, 42, the capacitor, 43, the grounding fixed plate, 44, the insulating plate, 45, the resistor, 46, the first pressure block, 47, the second conductive spring, 48, the compression spring, 49, the fixed seat, 50, the second static main contact, 51, the first guide plate, 52, the third conductive spring, 53, the second guide plate, 54, the connecting arm, 55, the crank arm, 56, the transmission shaft, 57, the inner support seat, 58, the transmission rod, 59, the first conductive spring, 60, the elastic rubber ring, 61, the first guide belt, 62, the pressure cylinder, 63, the piston, 64, the first moving arc contact, 65, the small nozzle. DETAILED DESCRIPTION

[0031] In order to clearly illustrate the technical features of this solution, this solution is described below through a specific implementation method.

[0032] like Figures 1 to 3 The arc extinguishing chamber dedicated to the switching reactor shown in the figure comprises an arc extinguishing chamber unit 1, a fast closing unit 2 and a RC unit 3 which are sequentially arranged along the axial direction. The outer support seat 24 of the arc extinguishing chamber unit is connected to the outlet seat 25 of the fast closing unit by bolts, and the transmission arm 13 of the arc extinguishing chamber unit of the internal transmission part is connected to the transmission shaft 56 of the fast closing unit by screws; the fixing seat 49 of the fast closing unit is connected to the conductive plate 36 of the RC unit by screws.

[0033] The arc extinguishing chamber unit 1 includes a first static contact unit 4, a first insulating support tube 5, a first moving contact unit 6 and an insulating pull rod 12, and the insulating pull rod 12 is connected to the operating mechanism. The first static contact unit 4 is fixed to one end of the first insulating support tube 5, the fast closing unit is fixed to the other end of the first insulating support tube, and the first moving contact unit 6 is slidably arranged in the first insulating support tube 5. During assembly, firstly, the inner support seat 57 of the first moving contact unit 6 and the outer support seat 24 of the first insulating support tube 5 are fixed by bolts, and then the first static contact unit 4 is placed on the other side of the first insulating support tube 5, and after adjusting the first static arc contact 16 of the first static contact unit 4 and the first moving arc contact 64 of the first moving contact unit 6 to be centered, the static contact support seat 15 of the first static contact unit 4 and the first outer support ring 19 of the first insulating support tube 5 are fixed by bolts, and finally the insulating pull rod 12 and the transmission arm 13 of the first moving contact unit 6 are fixed by bolts.

[0034] The first static contact unit 4 includes a first outlet seat 14, a static contact support seat 15, a guide cylinder 17, a contact finger fixing seat 18 and a first static contact fixedly arranged. The first static contact includes a first static arc contact 16 located in the center and a first static main contact 20 located at the periphery of the first static arc contact. The first static arc contact 16 is fixedly connected to the static contact support seat 15 by a thread, and the first static main contact 20 is fixedly connected to the contact finger fixing seat 18 by a screw. During assembly, the contact finger fixing seat 18 is first connected to the first static main contact 20 by screws; then the contact finger fixing seat 18 is aligned with the first static contact support seat 15 and fixed with screws, and then the guide cylinder 17 is pressed into the interior, and the relative position of the guide cylinder 17 and the contact finger fixing seat 18 is fixed by screws; finally, the first static arc contact 16 is screwed into the static contact support seat 15 by a thread, and the first outlet seat 14 and the static contact support seat 15 are fixed by bolts.

[0035] The first moving contact unit 6 includes a first moving contact axially arranged opposite to the first static contact, a transmission rod 58 fixed to the first moving contact, a transmission arm 13, a large nozzle 22, an inner support seat 57, a first conductive spring 59, an elastic rubber ring 60, a first guide belt 61, a pressure cylinder 62, a piston 63 and a small nozzle 65. The transmission rod is made of aluminum alloy, and the transmission rod is fixed to the insulating rod through the transmission arm. The first moving contact includes a first moving main contact 23 and a first moving arc contact 64. The first moving main contact 23 is axially opposite to the first static main contact 20, and the first moving arc contact 64 is axially opposite to the first static arc contact 16. During assembly, first place the inner support seat 57 vertically and install it into the transmission arm 13, then put the first conductive spring 59 into the conductive groove of the inner support seat 57, and put the elastic rubber ring 60 and the first guide belt 61 into the guide groove; install the first moving arc contact 64 into the small nozzle 65, and then into the piston 63, and then complete the connection between the first moving arc contact 64 and the transmission rod 58 through threads; put the large nozzle 22 into the first moving main contact 23, and then fix the first moving main contact 23, the piston 63 and the pressure cylinder 62 by screws to form an assembly; finally, put the assembly into the inner support seat 57, and the transmission rod 58 of the assembly is fixed to the transmission arm 13 by screws.

[0036] The first insulating support tube 5 includes a first outer support ring 19, an insulating support tube 21 and an outer support seat 24. After the first outer support ring 19, the insulating support tube 21 and the outer support seat 24 are aligned by special tooling, they are assembled into one by a press.

[0037] The fast closing unit includes a second moving contact unit 7, a second insulating support cylinder 8 and a compressible static contact 9. During assembly, the second insulating support cylinder 8 is first placed horizontally, and the transmission mechanism chamber 27 is connected to the second outlet seat 25 of the second moving contact unit by screws; then the fixing seat 49 of the compressible static contact is fixed to the outer support ring 32 of the second insulating support cylinder by bolts. The second moving contact unit 7 includes a second outlet seat 25, a disconnecting spring 26, a guide belt 29, a second moving contact 30, a first guide plate 51, a third conductive spring 52, a second guide plate 53, a connecting arm 54, a crank arm 55 and a transmission shaft 56. The end of the second moving contact 30 is sintered with copper-tungsten alloy.

[0038] Specifically, the fast closing unit 2 of this embodiment includes a second insulating support tube 8 fixedly connected to the first insulating support tube 5 at one end, a fixed seat 49 fixedly connected to the other end of the second insulating support tube, and a second moving contact 30 slidably connected in the second insulating support tube. The second insulating support tube is provided with a transmission device connected to the transmission pull rod and driving the second moving contact to move axially. The fixed seat is provided with a compressible static contact 9 axially opposite to the second moving contact, and the compressible static contact is electrically connected to the resistor-capacitor unit. The compressible static contact 9 of this embodiment is slidably connected to the fixed seat 49, and a compression spring 48 is sleeved on the compressible static contact, one end of the compression spring is pressed against the conductive plate, and the other end is pressed against the limit platform set on the compressible static contact. Specifically, the compressible static contact 9 includes a second static contact 33, a second guide belt 34, a compression spring 48, a fixed seat 49 and a second static main contact 50, and the end of the second static contact 33 is sintered with copper-tungsten alloy. During assembly, firstly, the second guide belt 34 is installed in the fixing seat 49 , the second static main contact 50 is fixed by screws, and then the second static contact 33 is inserted, and finally the compression spring 48 is inserted into the second static contact 33 .

[0039] The transmission device includes a transmission shaft 56 fixed to the transmission pull rod and a crank arm 55 with one end hinged to the second insulating support tube 8, the other end of the crank arm 55 is hinged to the connecting arm 54, the connecting arm 54 is hinged to the second moving contact 30, the side of the crank arm away from the connecting arm is connected to the second insulating support tube 8 through a trip spring, the transmission shaft 56 is provided with a guide wheel 28 at one end facing the crank arm, and the side of the crank arm 55 is provided with a step opposite to the guide wheel. When the arc extinguishing chamber unit is opened, the transmission shaft drives the guide wheel to move, the guide wheel contacts the step, and pushes the crank arm to rotate. When the crank arm rotates to the point where the step is lower than the guide wheel, the guide wheel passes through the step surface and loses its pushing effect on the step. The transmission shaft on which the guide wheel is installed limits the rotation of the crank arm, so that the fast closing unit is in a closed state while the arc extinguishing chamber unit continues to be opened. A sliding hole for the transmission shaft to slide is provided in the transmission mechanism chamber, so that the transmission shaft moves axially and limits radial displacement of the transmission shaft.

[0040] The second insulating support cylinder 8 includes a transmission mechanism chamber 27, an insulating cylinder 31 and a second outer support ring 32. After the transmission mechanism chamber 27, the insulating cylinder 31 and the second outer support ring 32 are aligned by an alignment tool, the three are pressed together by a press. A partition is provided in the second insulating support cylinder 8, and a guide hole adapted to the second moving contact is opened on the partition. The guide hole and the second moving contact are also connected by a third conductive spring 52. The first guide plate 51 and the second guide plate 53 are fixedly connected on both sides of the guide hole, respectively. The second moving contact passes through the first guide plate 51, the partition and the second guide plate 53 in sequence.

[0041] During assembly, firstly, put the third conductive spring 52 into the transmission mechanism chamber 27 of the second insulating support tube 8, then fix the first guide plate 51 and the second guide plate 53 on the left and right sides by bolts, put the guide belt 29 into the first guide plate 51 and the second guide plate 53, fix the crank arm 55 in the transmission mechanism chamber 27 by an axle pin, and put the guide wheel 28 into the guide part of the transmission mechanism chamber 27 after being connected with the transmission shaft 56; complete the connection between the second moving contact 30 and the connecting arm 54 by the axle pin, and then insert the moving contact 30 into the conductive spring 52, and complete the connection between the connecting arm 54 and the crank arm 55 by adjusting the axle pin; fix the second outlet seat 25 to the transmission mechanism chamber 27 by screws, and then connect the opening spring 26 to the second outlet seat 25 and the crank arm 55 respectively.

[0042] The RC unit 3 includes a resistor unit 10 and a capacitor unit 11 , and the resistor unit 10 and the capacitor unit 11 are connected to the first fixing plate 41 respectively.

[0043] The resistor unit 10 includes a phase-locked loop 35 , a conductive plate 36 , an adjustment block 37 , a second pressure block 38 , an insulating rod 39 , a compression spring 40 , a first fixing plate 41 , an insulating plate 44 , a resistor sheet 45 , and a first pressure block 46 .

[0044] The conductive plate 36 and the first fixed plate 41 are fixedly connected through the insulating plate 44, the conductive plate 36 is fixedly connected to the fixed seat 49, the compressible static contact passes through the conductive plate and contacts the conductive plate, and the conductive plate and the compressible static contact are also connected through the second conductive spring 47. The insulating rod 39 is inserted through the conductive plate 36 and the first fixed plate 41, and the adjusting block 37, the first pressing block 46, the second pressing block 38 and the pressing spring 40 are sequentially sleeved on the insulating rod between the conductive plate and the first fixed plate, and a plurality of resistors 45 are sleeved on the insulating rod between the first pressing block 46 and the second pressing block 38, and the resistors 45 are connected to the first fixed plate through a wire, and the first fixed plate is connected to the grounded fixed plate 43 through the capacitor 42. During assembly, first, the insulating rod 39 with a groove is connected to the conductive plate 36 through the phase-locked loop 35, and then the adjustment block 37, the first pressure block 46, the resistor 45, the second pressure block 38 and the clamping spring 40 are sequentially connected to the insulating rod 39, wherein the second pressure block 38 is designed to be connected with the first fixed plate 41 by a wire; the insulating plate 44 is connected to the conductive plate 36 by bolts; then, the first fixed plate 41 is connected to the insulating rod 39, and the phase-locked loop 35 is placed in the groove of the insulating rod 39 to prevent the insulating rod 39 from moving back and forth, and the insulating plate 44 is connected to the first fixed plate 41 by screws; finally, the second conductive spring 47 is placed in the conductive groove of the conductive plate 36 to ensure that the tail end of the second static contact 33 is in good contact with the conductive plate 36 to complete the conductive function.

[0045] The capacitor unit 11 includes a capacitor 42 and a grounding fixing plate 43. The capacitor 42 is connected to the grounding fixing plate 43 by screws, and the other side is connected to the first fixing plate 41 by screws; the grounding fixing plate 43 is connected to the grounding terminal by bolts.

[0046] The working principle of the present invention is that, driven by the operating mechanism, the transmission arm 13 is driven to move through the insulating pull rod 12, thereby driving the movable part of the first moving contact unit 6 of the arc extinguishing chamber unit and the movable part of the second moving contact unit of the fast closing unit 2 to move. When the arc extinguishing chamber unit performs a closing operation, the fast closing unit performs an opening operation to separate the RC unit from the high-voltage line; when the arc extinguishing chamber unit performs an opening operation, the fast closing unit performs a closing operation to put the RC unit into operation, so as to limit the generation of overvoltage and improve the reliability of the power system operation.

[0047] The method for using the arc extinguishing chamber dedicated to the switching reactor of the present invention comprises the following aspects:

[0048] 1. When the arc extinguishing chamber unit performs the opening operation, the operating mechanism drives the first moving contact to move away from the first static contact through the insulating pull rod, and at the same time pushes the second moving contact to move toward the compressible static contact through the transmission device;

[0049] When the first moving contact and the first static contact of the arc extinguishing chamber unit are in the just-opened position, the second moving contact of the fast closing unit faces the compressible static contact in the just-closed position;

[0050] When the arc extinguishing chamber unit continues to perform the opening operation, the second moving contact of the fast closing unit continues to move and performs the closing operation until the guide wheel of the connecting arm loses its function. At this time, the arc extinguishing chamber unit continues to perform the opening operation, while the fast closing unit has been closed in place and will not close any more;

[0051] 2. When the arc extinguishing chamber unit executes the closing command, the operating mechanism drives the first moving contact to move toward the first static contact through the insulating pull rod. When the first moving contact of the arc extinguishing chamber unit just moves, the fast closing unit executes the idle stroke and does not move. When the guide wheel of the connecting arm retreats to the point where it no longer acts on the turning arm, the turning arm begins to perform the opening operation under the action of the opening spring. When the arc extinguishing chamber unit is fully closed to the bottom, due to the spring hysteresis of the fast closing unit, the fast closing unit slowly opens to complete the disconnection of the RC unit.

[0052] 3. For the fast closing unit, when the arc extinguishing chamber unit executes the opening command, the fast closing unit performs the closing operation, and the second moving contact closes under the action of the transmission shaft. When the second moving contact contacts the second static contact, the second static contact is pushed to continue moving, and the compression spring is compressed. The second static contact ensures the contact pressure between the two under the action of the spring force; when the arc extinguishing chamber unit executes the closing command, the fast closing unit performs the opening operation, and the second moving contact slowly completes the opening operation under the action of the opening spring;

[0053] 4. For the RC unit, when the arc extinguishing chamber unit performs the opening operation, it is put into operation; when the arc extinguishing chamber unit performs the closing operation, the fast closing unit slowly opens the circuit to make it stop running.

[0054] The present invention timely puts the RC unit into operation when cutting off the reactor, limits the overvoltage of the opening switch, and prevents the occurrence of restrike and restrike between the interrupter breaks; after the reactor is put into operation, the RC unit is isolated by separating the contacts in the fast closing unit, and is no longer put into the power grid system, thereby increasing the service life of the RC unit.

[0055] Of course, the above description is not limited to the above examples. Technical features not described in the present invention can be achieved by or by using existing technologies, which will not be described here. The above embodiments and drawings are only used to illustrate the technical scheme of the present invention and are not limitations of the present invention. The present invention is described in detail with reference to the preferred implementation methods. Ordinary technicians in this field should understand that changes, modifications, additions or substitutions made by ordinary technicians in this technical field within the essential scope of the present invention do not depart from the purpose of the present invention, and should also fall within the scope of protection of the claims of the present invention.

Claims

1. An arc extinguishing chamber dedicated to switching reactors, characterized in that: It comprises an arc extinguishing chamber unit (1), a fast closing unit (2) and a resistance-capacitance unit (3) which are arranged in sequence. The arc extinguishing chamber unit (1) comprises a first insulating support tube (5) having a first static contact unit fixedly connected at one end thereof and a first moving contact unit (6) slidably arranged in the first insulating support tube, the other end of the first insulating support tube being fixedly connected to a fast closing unit, the first static contact unit comprising a first static contact fixedly arranged, the first moving contact unit comprising a first moving contact axially arranged opposite to the first static contact, and a transmission pull rod fixedly connected to the first moving contact, the transmission pull rod being fixedly connected to an insulating pull rod (12) connected to an operating mechanism; The rapid closing unit (2) comprises a second insulating support tube (8) fixedly connected to the first insulating support tube (5) at one end, a fixing seat (49) fixedly connected to the other end of the second insulating support tube, and a second moving contact (30) slidably connected in the second insulating support tube, the second insulating support tube is provided with a transmission device connected to the transmission pull rod and driving the second moving contact to move axially, the fixing seat is provided with a compressible static contact axially opposite to the second moving contact, and the compressible static contact is electrically connected to the resistor-capacitor unit; The transmission device comprises a transmission shaft (56) fixedly connected to the transmission pull rod and a crank arm (55) having one end hinged to the second insulating support tube (8); the other end of the crank arm (55) is hinged to the connecting arm (54); the connecting arm (54) is hinged to the second moving contact (30); a side of the crank arm away from the connecting arm is connected to the second insulating support tube (8) via a disconnecting spring; a guide wheel (28) is installed at one end of the transmission shaft (56) facing the crank arm; and a step opposite to the guide wheel is provided on a side of the crank arm; The resistance-capacitance unit comprises a conductive plate (36) fixedly connected to a fixing seat (49); the compressible static contact passes through the conductive plate and contacts the conductive plate; the conductive plate and the compressible static contact are also connected via a second conductive spring (47).

2. The arc extinguishing chamber dedicated to switching reactor according to claim 1, characterized in that: A partition is provided in the second insulating support cylinder (8), and a guide hole adapted to the second moving contact is provided on the partition.

3. The arc extinguishing chamber dedicated to switching reactor according to claim 1, characterized in that: The compressible static contact is in sliding connection with the fixed seat, and a compression spring (48) is sleeved on the compressible static contact, one end of the compression spring presses against the conductive plate, and the other end presses against a limit platform arranged on the compressible static contact.

4. The arc extinguishing chamber dedicated to switching reactor according to claim 1, characterized in that: The resistor-capacitor unit comprises a conductive plate (36) and a first fixed plate (41) fixedly connected via an insulating plate (44), and an insulating rod (39) inserted through the conductive plate (36) and the first fixed plate (41); an adjusting block (37), a first pressing block (46), a second pressing block (38) and a pressing spring (40) are sequentially sleeved on the insulating rod between the conductive plate and the first fixed plate; a plurality of resistor sheets sleeved on the insulating rod are further provided between the first pressing block (46) and the second pressing block (38); the resistor sheets are connected to the first fixed plate via a wire, and the first fixed plate is connected to the grounded fixed plate (43) via a capacitor (42).

5. The method for using the arc extinguishing chamber dedicated to switching reactors according to any one of claims 1 to 4, characterized in that: Including the following aspects: (1) When performing the opening operation, the operating mechanism drives the first moving contact to move away from the first static contact through the insulating pull rod, and at the same time pushes the second moving contact to move toward the compressible static contact through the transmission device; When the first moving contact and the first static contact of the arc extinguishing chamber unit are in the just-opened position, the second moving contact of the fast closing unit faces the compressible static contact in the just-closed position; When the arc extinguishing chamber unit continues to perform the opening operation, the second moving contact of the fast closing unit continues to move and performs the closing operation until the guide wheel loses its function. At this time, the arc extinguishing chamber unit continues to perform the opening operation, while the fast closing unit has already closed in place and will not close any more; (2) When executing the closing command, the operating mechanism drives the first moving contact to move toward the first static contact through the insulating pull rod. When the first moving contact of the arc extinguishing chamber unit just moves, the fast closing unit executes the idle stroke and does not move. When the guide wheel retreats to the point where it no longer acts on the crank arm, the crank arm begins to perform the opening operation under the action of the opening spring. When the arc extinguishing chamber unit is fully closed to the bottom, due to the spring hysteresis of the fast closing unit, the fast closing unit slowly opens and completes the disconnection of the RC unit.

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