CN207966846U - A kind of series compensation type current-limiting apparatus interlocking vacuum switch and application - Google Patents

Abstract

An interlocking vacuum switch and its applied series compensation type current limiting device. The switch adopts an interlocking vacuum interrupter, and a fast repulsion mechanism is selected to cooperate with it, so as to realize the rapid switching of the two different functions of series compensation and current limiting of the series compensation type current limiting device. Conversion; when the traction network line is running normally, the series compensation capacitor is connected, and the device is in the series compensation working state; when a short-circuit fault occurs in the line, the interlock vacuum switch acts to short-circuit the capacitor, and the current-limiting reactance is put into the system to reduce the short-circuit current of the line. Play a limiting role; the utility model is inside the same arc extinguishing chamber, the static main contact and the moving main contact constitute the first contact group to realize the input and removal of the current limiting reactor, the static auxiliary contact and the moving auxiliary contact The second contact group is formed to realize the input and removal of the compensation capacitor; the utility model adopts a single vacuum interrupter and a group of operating mechanisms to realize the conversion of the series compensation and current limiting functions of the traction system, which can reduce the volume cost and economical cost of the device. cost and improve system reliability.

Description

An interlocked vacuum switch and its applied series compensation type current limiting device

technical field

The interlocking vacuum switch in the utility model belongs to the field of high-voltage vacuum switches, and specifically relates to an interlocking vacuum switch that uses a single vacuum switch to realize two different functions at the same time; the series compensation type current limiting device used in it belongs to the traction system (or The comprehensive field of electric power system) series compensation and current limiting technology, specifically relates to a series compensation type current limiting device based on an interlocked vacuum switch.

Background technique

The power supply of the electrified railway is to build several traction substations along the railway. The main task of the traction substation is to reduce the 110kV (or 220kV) three-phase alternating current from the power system to 27.5kV (or 2× 27.5kV) single-phase power, and then the single-phase power supply is sent to the catenary through the feeder line, and the catenary supplies power to the electric locomotive. However, on long slopes, heavy-duty lines and the end of the power supply arm, the catenary voltage loss is serious, and the voltage level is low. When the network voltage is lower than the minimum value (19kV) required by the traction regulations, the power The locomotive cannot be towed normally. In engineering practice, series capacitor compensation is an effective improvement measure. Applying series capacitor compensation device to the line can effectively increase the voltage level of the traction network, improve the power factor of the traction network, and improve the quality of the power supply of the traction substation.

In addition, short circuit is the most common and serious fault in traction power supply system. The probability of one-arm grounding short circuit is the highest. When a short circuit occurs in the system, the current increases sharply and the system voltage decreases. When the short circuit occurs, the current value reaches several times to dozens of times the rated value. The impact of equipment dynamic stability and thermal stability, when a short-circuit fault occurs, reactance can be introduced in the fault line to reduce the short-circuit current level.

The series compensation type fault current limiter can solve the two major problems of large voltage drop and short circuit in the traction network at the same time. At present, most of the proposed topologies are parallel switches on both sides of the capacitor component, and there is no parallel switch on both sides of the current limiting reactance component. In this case, the reactive components are always running in the line, resulting in huge reactive power loss. In view of this, it is indeed necessary to provide a current limiting device with series compensation function and "zero" loss.

If such a current-limiting device with series compensation function and "zero" loss is realized, a series compensation capacitor and a current-limiting reactor are required to be connected in parallel with the fast switch and then connected in series. The coordination relationship between the series compensation capacitor and the current-limiting reactance in the line is as follows: when the line is running normally, the switch connected in parallel with the compensation capacitor remains in the open state. At this time, the capacitor component is connected to the line, and the device works in the series compensation state. The switch connected in parallel with the current-limiting reactance is closed, and the current-limiting reactance is bypassed, thereby realizing "zero" loss in reactance operation. When a short-circuit fault occurs on the line, the switch connected in parallel with the compensation capacitor is closed, and the switch connected in parallel with the current-limiting reactance is opened, and the current-limiting reactance is put into the system, and the device works in a current-limiting state to limit the short-circuit current of the line.

The current vacuum switch interrupter can only control a group of components to realize switching of the components. If the switching of the above-mentioned series compensation and short-circuit fault current limiting functions is to be realized at the same time, two vacuum switches and two sets of independent operating mechanisms are required. In this case, the material, cost and volume are greatly increased, and the switch control system The complexity reduces the reliability of line protection.

Contents of the invention

The purpose of the utility model is to provide an interlocking vacuum switch and its applied series compensation type current limiting device. A single arc extinguishing chamber is used to simultaneously realize the conversion of two functions of device series compensation and short-circuit current limitation, which can reduce the volume and cost of the device, reduce The number of vacuum interrupters used in the device simplifies the design of the operating mechanism and transmission components and improves the reliability of the device.

In order to achieve the above object, the utility model adopts the following technical solutions:

An interlocking vacuum switch mainly includes two parts: an interlocking vacuum interrupter and a fast repulsion mechanism;

The interlocking vacuum interrupter includes a static end side part, a moving end side part and a shell structure; the static end side part includes a static conductive rod 1, a static main contact 2, a static auxiliary contact 7 and a metal flange 8. The upper end of the static conductive rod 1 is welded to the upper side of the insulating shell 10 and passes through, the lower end of the static conductive rod 1 is welded with the static main contact 2, the metal flange 8 is fixed in the middle of the insulating shell 10, and the metal flange 8 The upper end is welded with a static auxiliary contact 7; the moving end side part includes a moving conductive rod 4, a moving main contact 3, a moving conductive ring 5 and a moving auxiliary contact 6; the upper end of the moving conductive rod 4 is welded with a moving main contact 3, A cylindrical movable conductive ring 5 is welded at the joint between the upper end of the movable conductive rod 4 and the lower end of the movable main contact 3, and the lower end of the movable conductive ring 5 is welded with a movable auxiliary contact 6; inside the same vacuum interrupter, static The main contact (2) and the moving main contact (3) form the first contact group, the static auxiliary contact (7) and the moving auxiliary contact (6) form the second contact group; the moving conductive rod 4 and the insulating shell The lower sides of 10 are connected by bellows 11; the insulating shell 10 is provided with a shielding cover 9, which can wrap two groups of contacts throughout;

The fast repulsion mechanism includes a moving part, a circuit part, a bistable holding structure and a frame; the moving part includes an insulating pull rod 15 and a repulsion disk 18, and the lower end of the insulation pull rod 15 is connected with the repulsion disk 18; the circuit part includes a charging power supply, and The opening circuit and the opening circuit, the opening circuit is composed of the first drive coil 19, the coil 1 control 21 and the first energy storage capacitor 22 in series, and the closing circuit is composed of the second drive coil 20, the coil 2 control 23 and the second storage capacitor Energy capacitors 24 are sequentially connected in series; the first drive coil 19 and the second drive coil 20 are located on both sides of the repulsion disk 18 and placed in the frame 26; the charging power supply 25 is simultaneously connected in parallel to the first energy storage capacitor 22 and the second energy storage capacitor 24 On both sides, the first energy storage capacitor 22 and the second energy storage capacitor 24 are stored; the bistable holding structure includes a bistable spring 16 and a connecting rod 17, one end of the bistable spring 16 is fixed to the frame 26, and the other end is passed through the connecting rod 17 links to each other with insulating pull rod 15; One end of connecting rod 17 that links to each other with insulating pull rod 15 can move up and down under the drive of insulating pull rod 15; Bistable spring 16 is in compressed state all the time, when insulating pull rod 15 moves upwards, bistable spring 16 passes through The connecting rod 17 applies an upward holding force to the insulating pull rod 15. When the insulating pull rod 15 moves downward, the bistable spring 16 applies a downward holding force to the insulating pull rod 15 through the connecting rod 17, thereby realizing the closing and opening of the contacts The bistable holding effect;

The interlocking vacuum interrupter is selected to cooperate with the fast repulsion mechanism with bistable holding structure. The moving conductive rod 4 inside the arc extinguishing chamber is connected with the insulating pull rod 15 of the fast repulsion mechanism and the repulsion disk 18, driven by the movement of the repulsion disk 18. The closing and opening of the two pairs of contact groups in the interrupter keeps the contact groups in two positions under the action of the bistable holding structure, thereby realizing the "single pole double throw" function in the vacuum interrupter.

The static main contact 2 and the moving main contact 3 are cup-shaped longitudinal magnetic contacts or groove-shaped transverse magnetic contacts, and the material is copper-chromium alloy.

The movable pair of contacts 6 and the static pair of contacts 7 are slotted according to specific needs, and the material is copper-tungsten alloy.

A series compensation type current limiting device based on an interlocking vacuum switch, including a device inlet terminal 1', a device outlet terminal 2', a current limiting reactor 3', a series compensation capacitor 4', and a zinc oxide voltage limiting energy-absorbing component 5 ', the damper 6' and the interlock vacuum switch 7' described in claim 1;

The main branch of the device is composed of a current-limiting reactor 3' and a series compensating capacitor 4' connected in series. The conductive rod terminal 12 is connected to the incoming line end of the current-limiting reactor 3', the movable conductive rod terminal 14 is connected to the common point between the current-limiting reactor 3' and the series compensation capacitor 4', and the metal flange terminal 13 is connected to the The damper 6' is connected to the outlet terminal of the series compensation capacitor 4'; the zinc oxide pressure limiting energy-absorbing component 5' is connected in parallel to both sides of the series compensation capacitor 4';

The series compensation capacitor 4' is used to compensate the inductive reactance in the external circuit of the system connected to the device inlet terminal 1' and the device outlet terminal 2', and the current limiting reactor 3' is used to limit the current in the circuit when the external circuit is short-circuited, zinc oxide The pressure-limiting energy-absorbing component 5' is used to prevent the capacitor from generating overvoltage when a short circuit occurs; the damper 6' is composed of an inductance and a resistor connected in parallel to release its electric energy after the series compensation capacitor 4' is short-circuited, and the interlock vacuum switch 7' is used It is used to realize the conversion of series compensation and current limiting functions.

In the same arc extinguishing chamber, the static main contact (2) and the moving main contact (3) form the first contact group to realize the input and removal of the current limiting reactor 3', the static auxiliary contact (7) and the moving auxiliary contact The contacts (6) constitute the second contact group to realize input and removal of the series compensation capacitor 4'.

In the working process of the series compensation type current limiting device, when the static main contact 2 and the moving main contact 3 in the interlocking vacuum switch connected in parallel to both sides of the current limiting reactor 3' are closed, at the same time the moving auxiliary contact 6 When the and static auxiliary contact 7 is opened, the current limiting reactor 3' is bypassed at this time, the series compensation capacitor 4' is connected to the line, the current in the external system flows in through the device inlet terminal 1', and passes through the static state of the interlock vacuum switch. The conductive rod terminal 12, the static conductive rod 1, the static main contact 2, the moving main contact 3, the moving conductive rod 4, the moving conductive rod terminal 14 and the series compensation capacitor 4' flow out from the outlet terminal 2' of the device, and the device Work in the series compensation state; when the moving auxiliary contact 6 and the static auxiliary contact 7 in the interlocking vacuum switch connected in parallel to both sides of the series compensation capacitor 4' are closed, and the static main contact 2 and the moving main contact 3 are opened at the same time At this time, the current-limiting reactor 3' is connected to the line, the series compensation capacitor 4' is bypassed, and the current in the external system flows in through the device inlet terminal 1', through the current-limiting reactor 3', the moving conductive rod outlet terminal 14, The moving conductive rod 4, the moving conductive ring 5, the moving auxiliary contact 6, the static auxiliary contact 7, the metal flange 8, the metal flange outlet end 13 and the damper 6' flow out from the device outlet end 2', and the device works in current limiting state.

Compared with the prior art, the utility model has the following advantages:

1. Use the characteristics of the two pairs of contact groups in the interlocking vacuum interrupter to cooperate with the fast repulsion mechanism with bistable holding structure, so as to realize the "single pole double throw" function in the vacuum interrupter to control the power supply to the two output in different directions or control two devices at the same time.

2. The interlocking vacuum interrupter separates the movable and auxiliary contacts from the conductive rod through the movable conductive ring, which increases the contact area of the auxiliary contacts and improves the current carrying capacity. The head is independent, and it is more convenient to add cup-shaped longitudinal magnets, groove-shaped transverse magnets or other contact magnetic field structure designs, and the main contacts can have short-circuit current breaking capabilities.

3. The two pairs of contact groups of the switch have interlocking linkage characteristics. When one group of contacts is opened, the other group of contacts must be closed, which reduces the complexity of the switch control system.

4. The use of the fast repulsion mechanism in the switch enables the current-limiting reactance in the series compensation current-limiting device to be quickly put into operation, reducing the thermal shock and high-current impact of the fault current on the line, and improving the safety of the line. At the same time, the fast repulsion mechanism is suitable for the characteristics of phase selection and opening, and can realize the control of the actual arcing time of the switch, so that the switch contacts can be separated at the most favorable phase for arcing, greatly improving the actual breaking capacity and electrical life of the switch, and improving system reliability and power quality.

5. One switch can be used to realize the input and removal of the two different components of the series compensation capacitor and the current limiting reactance in the device, which reduces the use of one switch, greatly reduces the volume of the device, greatly reduces the occupied area, and greatly reduces costs and maintenance costs required.

Description of drawings

Fig. 1 is a structural schematic diagram of the interlocking vacuum switch of the present invention when the main contact is closed and the auxiliary contact is opened.

Fig. 2 is a structural schematic diagram of the interlocking vacuum switch of the present invention when the main contact is opened and the auxiliary contact is closed.

In Figure 1 and Figure 2: 1. Static conductive rod; 2. Static main contact; 3. Moving main contact; 4. Moving conductive rod; 5. Moving conductive ring; 6. Moving auxiliary contact; 7. Static auxiliary Contact; 8. Metal flange; 9. Shielding cover; 10. Insulation shell; 11. Bellows; 12. Static conductive rod terminal; 13. Metal flange terminal; 14. Dynamic conductive rod terminal; 15. Insulation rod; 16, bistable spring; 17, connecting rod 18, repulsion disk; 19, first drive coil; 20, second drive coil; 21, coil 1 control; 22, first energy storage capacitor; 23, coil 2 Control; 24. Second energy storage capacitor; 25. Charging power supply; 26. Frame.

Fig. 3 is a structural schematic diagram of the interlock vacuum switch and the series compensation type current limiting device applied in the utility model when it is working in a series compensation state.

Fig. 4 is a structural schematic diagram of the interlock vacuum switch and the series compensation type current limiting device applied in the utility model when it works in the current limiting state.

In Figure 3 and Figure 4: 1', device inlet terminal; 2', device outlet terminal; 3', current-limiting reactor; 4', series compensation capacitor; 5' zinc oxide voltage-limiting energy-absorbing component; 6', Damper; 7', interlocking vacuum switch (the part of the repulsion mechanism is not shown).

Detailed ways

The interlock vacuum switch of the present invention and the series compensation type current limiting device applied thereto will be further described in detail below with reference to the accompanying drawings and specific embodiments.

As shown in Figure 1, the interlocking vacuum switch described in the utility model is mainly composed of an interlocking vacuum interrupter and a fast repulsion mechanism. The interlocking vacuum interrupter includes a static end side part, a moving end side part and a shell structure. The static end side part includes static conductive rod 1, static main contact 2, metal flange 8 and static auxiliary contact 7. The upper end of the static conductive rod 1 is welded to the upper side of the insulating shell 10 and passes through, the lower end of the static conductive rod 1 is welded with the static main contact 2, the metal flange 8 is fixed in the middle of the insulating shell 10, and the upper end of the metal flange 8 is welded There are static auxiliary contacts 7. The moving end side part includes a moving conductive rod 4 , a moving main contact 3 , a moving conductive ring 5 and a moving auxiliary contact 6 . The upper end of the movable conductive rod 4 is welded with a movable main contact 3, and a cylindrical movable conductive ring 5 is welded at the connection between the upper end of the movable conductive rod 4 and the lower end of the movable main contact 3, and the lower end of the movable conductive ring 5 is welded with a moving pair contact 6. The part on the moving end side is exactly the so-called "knife" in the single-pole double-throw switch, and the moving conductive rod 4 is connected with the lower side of the insulating shell 10 by the bellows 11. The insulating shell 10 is provided with a shielding cover 9, which can wrap the two groups of contacts in the whole process. In this way, inside the same vacuum interrupter, the static main contact 2 and the moving main contact 3 form the first contact group, and the static auxiliary contacts 7 and the moving auxiliary contacts 6 form the second contact group. When one side of the two contact groups is opened, the other side is closed, which has an interlocking linkage relationship. The moving conductive rod 4 passes through the static auxiliary contact 7, and the intermediate gap can withstand sufficient voltage requirements.

The fast repulsion mechanism includes a moving part, a circuit part, a bistable holding structure and a frame. The moving part includes an insulating pull rod 15 and a repulsion disk 18 , and the lower end of the insulation pull rod 15 is connected with the repulsion disk 18 . The circuit part includes a charging power supply, a closing circuit and an opening circuit. The opening circuit is composed of the first driving coil 19, the coil 1 control 21 and the first energy storage capacitor 22 in series. The closing circuit is composed of the second driving coil 20, the coil 2. The control 23 and the second energy storage capacitor 24 are sequentially connected in series. The charging power source 25 is connected in parallel to both sides of the first energy storage capacitor 22 and the second energy storage capacitor 24 to store energy in the first energy storage capacitor 22 and the second energy storage capacitor 24 .

The bistable holding structure includes a bistable spring 16 and a connecting rod 17 , one end of the bistable spring 16 is fixed to the frame 26 , and the other end is connected to the insulating pull rod 15 through the connecting rod 17 . One end of the connecting rod 17 connected to the insulating pull rod 15 can move up and down driven by the insulating pull rod 15 . The bistable spring 16 is always in a compressed state. When the insulating pull rod 15 drives the connecting rod 17 to move upward through the horizontal point of the connecting rod 17, the bistable spring 16 applies an upward holding force to the insulating pull rod 15 through the connecting rod 17. When the insulating pull rod 15 drives When the connecting rod moves downward past the horizontal point of the connecting rod 17, the bistable spring 16 exerts a downward holding force on the insulating pull rod 15 through the connecting rod 17, thereby realizing the bistable holding function of the closing and opening of the contacts.

The moving conductive rod 4 inside the arc extinguishing chamber is connected with the insulating pull rod 15 of the fast repulsion mechanism and the repulsion disk 18, and the movement of the repulsion disk 18 drives the closing and opening of the two pairs of contact groups in the arc extinguishing chamber. Under the action, the contact group is kept in two positions respectively, so as to realize the "single pole double throw" function in the vacuum interrupter.

As shown in Fig. 1, the static main contact 2 and the moving main contact 3 of the interlocking vacuum switch of the present invention are in the closing state, and the moving auxiliary contact 6 and the static auxiliary contact 7 are in the opening state. The movement process of opening the static main contact 2 and the moving main contact 3 of the interlocking vacuum switch of the present invention, and closing the moving auxiliary contact 6 and the static auxiliary contact 7 will be described in detail below.

The charging power supply 25 stores energy on the first energy storage capacitor 22 and the second energy storage capacitor 24. When the system receives the action instruction of the main contact opening and the auxiliary contact closing, the coil 1 controls the 21 to be turned on, and the first energy storage capacitor Capacitor 22 discharges the first drive coil 19 to generate a pulse current lasting for several milliseconds. Under the action of this pulse current, a transient magnetic field is generated around the coil, and at the same time, the metal repulsion disk 18 induces The eddy current, the magnetic field generated by the eddy current and the magnetic field of the first driving coil 19 generate a repulsive force, and the driving repulsion disk 18 drives the insulating pull rod 15, the moving conductive rod 4, the moving main contact 3 and the moving auxiliary contact 6 to move downward in a straight line, so that The static main contact 2 and the moving main contact 3 of the first contact group are opened, and the static auxiliary contact 7 and the moving auxiliary contact 6 of the second contact group are in reliable contact. The connecting rod 17 moves downward when the insulating rod 15 is driven downward, and the bistable spring 16, which has been in a compressed state, exerts a downward holding force on the insulating rod 15 through the connecting rod 17, thereby maintaining the static main contact 2 and The moving main contact 3 is open, the static auxiliary contact 7 and the moving auxiliary contact 6 are closing.

As shown in Figure 2, the static main contact 2 and the moving main contact 3 of the interlocking vacuum switch of the present invention are in the opening state, and the static auxiliary contact 7 and the moving auxiliary contact 6 are in the closing state. The following describes in detail the movement process of the main contact of the interlock vacuum switch of the present invention closing and the auxiliary contact opening.

The charging power supply 25 stores energy on the first energy storage capacitor 22 and the second energy storage capacitor 24. When the system receives the action instruction of closing the main contact and opening the auxiliary contact, the coil 2 controls the 23 to turn on, and the second storage capacitor Capacitor 24 discharges the second drive coil 20 to generate a pulse current that lasts for several milliseconds. Under the action of this pulse current, a transient magnetic field is generated around the second drive coil, and at the same time, the metal repulsion disk 18 induces a magnetic field that is compatible with the coil. The eddy current with the opposite current direction, the magnetic field generated by the eddy current and the magnetic field of the second driving coil generate repulsive force, and the driving repulsive disk 18 drives the insulating pull rod 15, the moving conductive rod 4, the moving main contact 3 and the moving auxiliary contact 6 to move upward linearly together, The static main contact 2 and the moving main contact 3 of the first contact group are reliably contacted, and the static auxiliary contacts 7 and the moving auxiliary contacts 6 of the second contact group are reliably opened. The connecting rod 17 is driven upward by the insulating rod 15, and the lower end moves upward. The bistable spring 16, which has been in a compressed state, exerts an upward holding force on the insulating rod 15 through the connecting rod 17, thereby maintaining the static main contact 2 and the moving main contact. 3 closing, the state of the static auxiliary contact 7 and the moving auxiliary contact 6 opening.

As shown in Figure 3, the series compensation type current limiting device using interlocking vacuum switch described in the utility model includes a device inlet terminal 1', a device outlet terminal 2', a current limiting reactor 3', and a series compensation capacitor 4 ', ZnO pressure-limiting energy-absorbing component 5', damper 6' and interlock vacuum switch 7'.

The main branch of the device is composed of a current-limiting reactor 3' and a series compensation capacitor 4' connected in series. The outlet end of the current-limiting reactor 3' is connected to the inlet end of the series compensation capacitor 4'. The terminal 12 is connected to the incoming line terminal of the current-limiting reactor 3', and the terminal 14 of the moving conductive rod is connected to the common point between the current-limiting reactor 3' and the series compensation capacitor 4'. The metal flange terminal 13 is connected to the outlet end of the series compensation capacitor 4' through the damper 6'. The zinc oxide pressure-limiting energy-absorbing component 5' is connected in parallel to both sides of the series compensating capacitor 4'.

As shown in Figure 3, the series compensation type current limiting device described in the utility model described in the series compensation capacitor on both sides of the moving contact 6 and the static contact 7 are opened, the capacitor is connected to the path, and it works in the series compensation state, which will be described in detail below. The conversion process of the series compensation type current limiting device described in the utility model from the series compensation state to the current limiting state is shown in Fig. 3 to Fig. 4. When the external circuit connected to the device inlet terminal 1' and the device outlet terminal 2' has a short-circuit fault , the interlock vacuum switch in the device starts to act, and the moving auxiliary contact 6 and the static auxiliary contact 7 of the interlocking vacuum switch connected in parallel to both sides of the series compensating capacitor 4' are closed, while the static main contact 2 and the moving main contact When the head 3 is opened, the current-limiting reactor 3' is connected to the line at this time, the series compensation capacitor 4' is bypassed, the electric energy in the series compensation capacitor is released through the damper, and the zinc oxide voltage-limiting energy-absorbing component 5' is used to prevent When a short circuit occurs, the capacitor generates an overvoltage to prevent the capacitor from being burned out. The current in the external system flows in through the input terminal 1' of the device, through the current limiting reactor 3', the outlet terminal 14 of the movable conductive rod, the movable conductive rod 4, the movable conductive ring 5, the movable auxiliary contact 6, and the static auxiliary contact 7 , metal flange 8, metal flange outlet terminal 13 and damper 6' flow out from the device outlet terminal 2', and the device works in a current-limiting state, which acts as a short-circuit fault current-limiting effect on the external system circuit.

As shown in FIG. 4 , the series compensation type current limiting device using an interlocking vacuum switch described in the present invention works in a current limiting state. The following is a detailed description of the conversion process of the series compensation type current limiting device described in the present invention from the current limiting state to the series compensation state. The interlock vacuum switch in the device starts to act, and the movable secondary contact 6 and the static secondary contact 7 of the interlock vacuum switch connected in parallel to the two sides of the series compensating capacitor 4' are opened, and at the same time the static main contact of the interlock vacuum switch on both sides is opened. When the contact 2 and the moving main contact 3 are closed, the current-limiting reactor 3' is bypassed, and the series compensation capacitor is connected to the line. The current in the external system flows in through the incoming line terminal 1' of the device, and passes through the static conductive rod terminal 12, static conductive rod 1, static main contact 2, moving main contact 3, moving conductive rod 4, and moving main contact of the interlock vacuum switch. The conductive rod terminal 14 and the series compensation capacitor 4' flow out from the outlet terminal 2' of the device, and the device works in a series compensation state, which plays the role of line compensation inductive reactance to the external circuit connected to the device.

The interlocking vacuum switch and the series compensation type current limiting device used in the utility model can complete the conversion of the two functions of series compensation and current limiting in the same arc extinguishing chamber, reducing the number and volume of parts. At the same time, the use of the fast repulsion mechanism enables the switch to quickly complete the conversion from series compensation to current limiting, reducing the thermal impact and large current impact of the fault current on the line. The control of arc time improves the actual breaking capacity and electrical life of the switch. The device has the advantages of simple structure, low price and high reliability.

Claims (5)

1. An interlocking vacuum switch, characterized in that it mainly includes two parts: an interlocking vacuum interrupter and a fast repulsion mechanism; The interlocking vacuum interrupter includes a static end side part, a moving end side part and a shell structure; the static end side part includes a static conductive rod (1), a static main contact (2), a static auxiliary contact ( 7) and metal flange (8); the upper end of the static conduction rod (1) is welded to the upper side of the insulating shell (10) and passes through, and the lower end of the static conduction rod (1) is welded with a static main contact (2), The metal flange (8) is fixed in the middle of the insulating shell (10), and the upper end of the metal flange (8) is welded with a static auxiliary contact (7); the moving end side part includes a moving conductive rod (4), a moving main contact ( 3), the movable conductive ring (5) and the movable auxiliary contact (6); the upper end of the movable conductive rod (4) is welded with the movable main contact (3), and the upper end of the movable conductive rod (4) and the movable main contact ( 3) A cylindrical movable conductive ring (5) is welded at the connection at the lower end, and a movable and auxiliary contact (6) is welded at the lower end of the movable conductive ring (5); inside the same vacuum interrupter, the static main contact ( 2) and the moving main contact (3) form the first contact group, the static auxiliary contact (7) and the moving auxiliary contact (6) form the second contact group; the moving conductive rod (4) and the insulating shell (10 ) are connected by bellows (11); the insulating casing (10) is provided with a shielding cover (9), which can wrap two groups of contacts throughout the whole process; The fast repulsion mechanism includes a moving part, a circuit part, a bistable holding structure and a frame; the moving part includes an insulating pull rod (15) and a repulsion disk (18), and the lower end of the insulation pull rod (15) is connected with the repulsion disk (18) The circuit part includes a charging power supply, a closing circuit and an opening circuit, and the opening circuit is composed of the first driving coil (19), the coil 1 control (21) and the first energy storage capacitor (22) in series in sequence, and the closing circuit consists of The second drive coil (20), the coil 2 control (23) and the second energy storage capacitor (24) are sequentially connected in series; the first drive coil (19) and the second drive coil (20) are located on both sides of the repulsion disk (18) and placed in the frame (26); the charging power supply (25) is simultaneously connected in parallel to both sides of the first energy storage capacitor (22) and the second energy storage capacitor (24), and is connected to the first energy storage capacitor (22) and the second energy storage capacitor (24). Capacitors (24) store energy; the bistable holding structure includes a bistable spring (16) and a connecting rod (17), one end of the bistable spring (16) is fixed to the frame (26), and the other end is connected to the frame (26) through the connecting rod (17). Insulation pull rod (15) links to each other; Connecting rod (17) one end that links to each other with insulation pull rod (15) can move up and down under the drive of insulation pull rod (15); Bistable spring (16) is in compressed state all the time, when insulation pull rod (15) ) moves upwards, the bistable spring (16) exerts an upward holding force on the insulating pull rod (15) through the connecting rod (17), and when the insulating pull rod (15) moves downward, the bistable spring (16) passes through the connecting rod ( 17) The downward holding force applied to the insulating pull rod (15), thereby realizing the bistable holding effect of contact closing and opening; The interlocking vacuum interrupter is selected to cooperate with the fast repulsion mechanism with bistable holding structure, and the moving conductive rod (4) inside the arc extinguishing chamber is connected with the insulating pull rod (15) and the repulsion disk (18) of the fast repulsion mechanism, and the The movement of the repulsive disk (18) drives the closing and opening of the two pairs of contact groups in the interrupter, and the contact groups are kept in two positions under the action of the bistable holding structure, so as to realize the " Single Pole Double Throw” feature. 2. The interlocking vacuum switch according to claim 1, characterized in that: the static main contact (2) and the moving main contact (3) are cup-shaped longitudinal magnetic contacts or groove-shaped transverse magnetic contacts, The material is copper chrome alloy. 3. The interlocking vacuum switch according to claim 1, characterized in that: the movable auxiliary contact (6) and the static auxiliary contact (7) are slotted according to specific needs, and the material is copper-tungsten alloy. 4. A series compensation type current limiting device based on an interlocked vacuum switch, characterized in that it includes a device inlet terminal (1'), a device outlet terminal (2'), a current limiting reactor (3'), a series compensation Capacitor (4'), zinc oxide pressure-limiting energy-absorbing component (5'), damper (6') and interlocking vacuum switch (7') described in claim 1; The main branch circuit of the device is composed of a current-limiting reactor (3') and a series compensation capacitor (4') connected in series, and the outlet terminal of the current-limiting reactor (3') is connected to the input terminal of the series compensation capacitor (4'), and at the same time The static conductive rod terminal (12) of the interlock vacuum switch (7') is connected to the incoming line end of the current-limiting reactor (3'), and the movable conductive rod terminal (14) is connected to the current-limiting reactor (3') and The common points between the series compensation capacitors (4') are connected, and the metal flange terminals (13) are connected to the outlet ends of the series compensation capacitors (4') through the damper (6'); the zinc oxide pressure-limiting energy-absorbing components (5 ') connected in parallel on both sides of the series compensation capacitor (4'); The series compensation capacitor (4') is used to compensate the inductive reactance in the system external circuit connected to the device inlet terminal (1') and the device outlet terminal (2'), and the current limiting reactor (3') is used to limit the short circuit of the external circuit The current in the circuit at all times, the zinc oxide pressure limiting energy absorbing component (5') is used to prevent the capacitor from generating overvoltage when the short circuit occurs; the damper (6') is composed of an inductance and a resistor connected in parallel and is used for series compensation of the capacitor (4') Release its electric energy after short-circuiting, and the interlock vacuum switch (7') is used to realize the conversion of the two functions of series compensation and current limiting. 5. The series compensation type current limiting device according to claim 4, characterized in that: in the same arc extinguishing chamber, the static main contact (2) and the moving main contact (3) form the first contact group to realize limiting The input and removal of the flow reactor (3'), the static auxiliary contact (7) and the movable auxiliary contact (6) form the second contact group to realize the input and removal of the series compensation capacitor (4').