WO2013116982A1

WO2013116982A1 - Energy absorber and vacuum circuit breaker using same

Info

Publication number: WO2013116982A1
Application number: PCT/CN2012/070917
Authority: WO
Inventors: 李六零; 徐东辉; 胡清
Original assignee: 阿尔斯通技术有限公司
Priority date: 2012-02-07
Filing date: 2012-02-07
Publication date: 2013-08-15

Abstract

The present invention provides an energy absorber applicable to a vacuum circuit breaker, comprising: a housing, provided with an opening at an end thereof; an elastic component, disposed inside the housing, and an adjustable piston, contacting the elastic component. The adjustable piston has a piston rod extending out of the opening at one of the two ends of the housing. The present invention also provides a vacuum circuit breaker equipped with said energy absorber.

Description

Energy absorbing device and vacuum circuit breaker using the same

The present invention relates to a power system, and more particularly to an energy absorbing device and a vacuum circuit breaker using the same. Background technique

At present, the vacuum interrupter uses 40.5kV and below. Due to the small size of the electrode, the distance between the fractures (between the plates) is very short (<30mm), and the pre-tightening pressure between the plates is small at the closing position (1000). Under Newton), the operation of the circuit breaker mechanism is very small. Even if the circuit breaker is bounced, the mechanical influence on the plate is not very prominent. There is currently no special device to eliminate bounce, and only the buffer of the circuit breaker mechanism is adjusted to reduce the number of bounces to less than three times.

For the voltage level of 72.5kV and above, due to the large electrode size and long break distance (≥60mm), the pre-tightening pressure between the plates at the closing position is large (more than 5000N), and the operation of the circuit breaker mechanism is very large. If a circuit breaker closing bounce occurs, the mechanical impact on the plates is outstanding. In the case of a three-phase arc extinguishing chamber with one operating mechanism, the synchronism of the three-phase arc extinguishing chamber and the pre-tightening pressure between the arc extinguishing chamber plates of each phase are not well adjusted, so the current vacuum breaking of the voltage level of 72.5 kV and above The device has a long bounce time (up to 4 milliseconds) and there is no effective solution. This has a great impact on the circuit breaker itself and on the power system.

For example, referring to Fig. 1, curve A in Fig. 1 is an ideal curve, and curve B is a closing curve of a prior art vacuum circuit breaker. It can be seen that the vacuum circuit breaker of the prior art has a bouncing when it is closed. This is mainly due to the collision between the two plate electrodes of the vacuum circuit breaker, and the buffer of the circuit breaker operating mechanism cannot be effectively absorbed.

In particular, in order to ensure the pre-tightening pressure between the plates during closing, it is only by the buffer in the circuit breaker mechanism plus the adjustment link length to reduce the number of bounces, because the adjustable range is within millimeters, it is difficult to adjust. . Summary of invention

In view of the above deficiencies of the prior art, the present invention aims to provide a novel energy absorbing device suitable for a vacuum circuit breaker to solve the above problems. In particular, the present invention is incorporated in a transmission system of a vacuum circuit breaker. An energy absorbing device is used to solve the problem of mechanical bounce damage of the closing bounce and the electrode, and it is easy to meet the pre-tightening pressure requirement between the plates during closing.

According to an aspect of the present invention, an energy absorbing device is provided for a vacuum circuit breaker, comprising: a housing having an opening at one end thereof; an elastic member disposed inside the housing; and an adjustable a piston in contact with the resilient member, and the adjustable piston has a piston rod extending from an opening of one of the two ends of the housing.

Preferably, in the above energy absorbing device, the method further includes: a locking mechanism located outside the housing, the locking mechanism having a nut, and the piston rod of the adjustable piston passes through the nut The locking mechanism can be locked to the piston rod via the nut to lock a position at which the nut meets the piston rod to a position where the adjustable piston is in contact with the elastic member The length between the positions is long.

Preferably, in the above energy absorbing device, the elastic member is a disc spring.

Further, according to another aspect of the present invention, a vacuum circuit breaker is provided, comprising: a vacuum interrupter; an operating link; and an energy absorbing device disposed between the vacuum interrupter and the operating link The energy absorbing device includes: a housing, an opening is respectively disposed at two ends of the housing; an elastic member is disposed inside the housing; and an adjustable piston is in contact with the elastic member, and The adjustable piston has a piston rod extending from an opening of one of the two ends of the housing, wherein a piston rod of the energy absorbing device is coupled to the operating link.

Preferably, in the above vacuum circuit breaker, the method further includes: an insulating tie rod disposed between the vacuum interrupter and the energy absorbing device, and a crank arm, one end of the arm being fixed to the The piston rod of the energy absorbing device is fixed to the operating link at the other end.

Preferably, in the above vacuum circuit breaker, the method further includes: an insulating tie rod, and an arm having one end fixed to the insulating tie rod and the other end fixed to the operation link, wherein the insulation A pull rod is disposed between the energy absorbing device and the arm.

Preferably, in the above vacuum circuit breaker, the method further includes: an insulating tie rod, and an arm, wherein one end of the arm is fixed to the insulating rod and the other end is fixed to the energy absorbing device, wherein A piston rod of the energy absorbing device is fixed to the operating link, wherein the insulating rod is disposed between the vacuum interrupter and the arm. The bounce problem of the circuit breaker can be completely eliminated by applying the energy absorbing device of the present invention to the vacuum circuit breaker. In addition, due to the use of a locking mechanism, the present invention can also conveniently adjust and limit the pre-tightening pressure between the electrodes of the vacuum circuit breaker when it is closed. Therefore, the energy absorbing device of the present invention and the vacuum circuit breaker using the same can reduce damage to the electrode surface by mechanical collision and prolong the life of the circuit breaker.

The foregoing description of the preferred embodiments of the invention, DRAWINGS

The accompanying drawings are included to provide a further understanding of the embodiments of the invention In the figure:

Figure 1 shows the curve when the circuit breaker is closed.

Figures 2a and 2b show the basic structure of an energy absorbing device according to the invention.

Fig. 3 shows the structure of a preferred embodiment of a vacuum circuit breaker equipped with the energy absorbing device shown in Fig. 2a.

4a to 4f schematically show the closing operation of the vacuum circuit breaker of the present invention. Detailed description of the invention

Embodiments of the present invention will now be described in detail with reference to the drawings.

Turning to Figures 2a and 2b, Figures 2a and 2b illustrate the basic structure of an energy absorbing device in accordance with two embodiments of the present invention. Referring to Fig. 2a, the energy absorbing device of the present invention may mainly include: a housing 201, an elastic member 202, and an adjustable piston 203.

As shown, one end of the housing 201 is provided with an opening. Further, in the embodiment shown in the drawings, the other end of the housing 201 has a thread for connection. The elastic member 202 is disposed inside the housing 201. Preferably, the elastic member 202 can be a disc spring. Of course, the invention is not limited thereto. Taking the disc spring as an example, the pressure and compression of the disc spring are non-linear during compression, and it is easy to find a disc spring that compresses 1 mm to produce 5000 Newton or more. The adjustable piston 203 is in contact with the elastic member 202 and is housed inside the housing 201, and the adjustable piston 203 has a piston rod extending from an opening of one of the above two ends of the housing 201. For example, in the embodiment shown in Figure 2a, the piston rod extends from the opening in the bottom of the housing 201, while in the embodiment shown in Figure 2b, the piston rod extends from the opening in the top of the housing 201.

According to a preferred embodiment, in the above energy absorbing device, a locking mechanism 204 may be further disposed outside the housing 201, the locking mechanism 204 having a nut, wherein the piston rod of the adjustable piston 203 passes through The nut of the locking mechanism 204. Specifically, the nut of the locking mechanism 204 can be locked with the arm 205 on the piston rod, thereby locking the position where the nut is in contact with the piston rod to a position where the adjustable piston 203 is in contact with the elastic member 202. The pole is long.

Turning now to Figure 3, Figure 3 shows the construction of an embodiment of a vacuum interrupter incorporating the energy absorbing device of Figure 2a. As shown, the vacuum circuit breaker of the present invention mainly comprises: a vacuum interrupter 301, an operating link 302, and an energy absorbing device 303 as shown in Fig. 2a or 2b above. Wherein, the energy absorbing device 303 is disposed between the vacuum interrupter 301 and the operating link 302, and the piston rod of the energy absorbing device 303 is directly or indirectly connected to the operating link 302. The operating link 302 is further coupled to a circuit breaker operating mechanism 306.

For example, according to the preferred embodiment illustrated in FIG. 3, the vacuum circuit breaker may further include: an insulating pull rod 304 and a crank arm 305. As shown, the insulating tie rod 304 is disposed between the vacuum interrupter 301 and the energy absorbing device 303. One end of the arm 305 is fixed to the piston rod of the energy absorbing device 303 and the other end is fixed to the operating link 302. According to a preferred embodiment, the insulating tie rod can be integrally formed with the energy absorbing device to make the overall vacuum circuit breaker structure more compact.

Referring to FIG. 3, the vacuum interrupter 301 has two upper and lower plates, and the lower plate is directly or indirectly connected to the insulating rod 304 through a conductor, and the insulating rod 304 is further rigidly connected to the elastic member in the energy absorbing device 303. . Therefore, by driving the operating link 302, the lower plate in the vacuum interrupter 301 can be pushed in turn via the arm 305, the elastic member and the insulating tie rod 304, thereby achieving the closing operation of the upper plate and the lower plate.

Further, unlike the embodiment shown in Fig. 3, another preferred embodiment of the present invention can provide the energy absorbing device between the vacuum interrupter and the insulating tie rod. That is, according to this embodiment, the insulating tie rod is disposed between the energy absorbing device and the arm, and one end of the arm is fixed to the insulating tie rod and the other end is fixed to the operating link. Further, unlike the embodiment shown in Fig. 3, yet another preferred embodiment of the present invention can provide the energy absorbing device between the arm and the operating link. That is, according to this embodiment, the insulating rod is disposed between the vacuum interrupter and the arm, and one end of the arm is fixed to the insulating rod and the other end is fixed to the energy absorbing device, wherein the piston rod of the energy absorbing device is fixed to the operation link.

The closing operation of the vacuum circuit breaker using the energy absorbing device of the present invention will be discussed in detail below with reference to Figs. 4a to 4f.

a. Adjust the pre-tightening pressure between the electrodes

This operation needs to be done before the vacuum circuit breaker is operated by spring or hydraulic pressure.

In the final closing position, as shown in Figure 4d, the vacuum interrupter is adjusted by adjusting the length of the piston rod of the piston of the energy absorbing device (adjustable piston 203 in Figure 2a) (vacuum arc extinguishing in Figure 3) Room 301) The pressure between the plates (eg 10000 N, or as required by the design book) to meet the needs of the conductive design. At this time, the elastic member in the energy absorbing device, such as the disc spring (the elastic member 202 in Fig. 2a), is compressed so that the surface where the piston in the energy absorbing device meets the elastic member is the same as the housing of the energy absorbing device ( A gap d is formed between the casings 201 in Fig. 2a (refer to Fig. 4d). After the adjustment is completed, the length of the piston rod is fixed by the nut of the locking mechanism (the locking mechanism 204 in Fig. 2a), that is, the rod between the nut and the piston rod to the position where the adjustable piston is in contact with the elastic member. long.

b. Closing process

The vacuum circuit breaker of the present invention is driven by the operating mechanism, starting from the opening position (refer to FIG. 4a), the gap between the upper and lower plates is gradually reduced (refer to FIG. 4b), and then contacting the two plates (refer to FIG. 4c). At this time, although the electrical conduction is made, the resistance between the plates is small, and the resistance is large, and the closing is not in place. As the mechanism moves, the arm begins to drive the piston to compress the elastic components in the energy absorbing device. After the compression distance d, the circuit breaker reaches the final closing position (refer to Figure 4d).

The bounce of the prior art vacuum circuit breaker mainly occurs for two reasons: (1) high-speed strong collision between the two plates in the arc extinguishing chamber; and (2) operation link and circuit breaker operating mechanism (302 and 306 of Fig. 4) ) Jitter during operation to drive the arm to rotate. In the present invention, the energy absorbing device can gradually increase the pressure between the two plates in the arc extinguishing chamber from zero to a flexible pressure, which reduces the collision strength; the jitter of the connecting rod (whether the operating mechanism buffer The reason, or the vibration of the operating link system), the rotation of the arm, can be loaded by energy absorption. The compression and extension of the elastic members within the set are eliminated, see Figures 4e and 4f.

In summary, the energy absorbing device of the present invention and the vacuum circuit breaker thereof have at least the following advantages:

1) completely eliminate the bounce problem of the circuit breaker;

2) It is convenient to adjust and limit the pre-tightening pressure between the electrodes when the vacuum circuit breaker is closed.

3) Reduce the damage of the mechanical surface to the electrode surface and prolong the life of the circuit breaker.

In particular, it can be seen from the curve C of the circuit breaker closing of the present invention in Fig. 1 that the present invention can effectively eliminate the bounce phenomenon and is very close to the ideal curve A. It will be apparent to those skilled in the art that various modifications and changes can be made in the above-described embodiments of the present invention without departing from the spirit and scope of the invention. Therefore, it is intended that the present invention cover the modifications and modifications of the invention

Claims

Claim

An energy absorbing device, suitable for a vacuum circuit breaker, characterized in that it comprises:

a housing, one end of the housing is provided with an opening;

An elastic member disposed inside the housing;

An adjustable piston is in contact with the resilient member and the adjustable piston has a piston rod extending from an opening of one of the two ends of the housing.

2. The energy absorbing device according to claim 1, further comprising:

a locking mechanism, located outside the housing, the locking mechanism has a nut, and the piston rod of the adjustable piston passes through the nut

Wherein the locking mechanism can be locked to the piston rod via the nut to lock a position at which the nut meets the piston rod to a position where the adjustable piston meets the elastic member The length between the poles.

The energy absorbing device according to claim 1, wherein the elastic member is a disc spring.

4. A vacuum circuit breaker, comprising:

Vacuum interrupter;

Operating the connecting rod;

The energy absorbing device according to claim 1, disposed between said vacuum interrupter and said operating link, wherein a piston rod of said energy absorbing device is coupled to said operating link.

5. The vacuum circuit breaker according to claim 4, further comprising:

An insulating tie rod disposed between the vacuum interrupter and the energy absorbing device, and

An arm, one end of the arm is fixed to the piston rod of the energy absorbing device and the other end is fixed to the operating link.

The vacuum circuit breaker according to claim 4, further comprising:

Insulated tie rod, and

An arm, one end of the arm is fixed to the insulating rod and the other end is fixed to the operating link, wherein the insulating rod is disposed between the energy absorbing device and the arm.

The vacuum circuit breaker according to claim 4, further comprising:

Insulated tie rod, and

An arm, wherein one end of the arm is fixed to the insulating rod and the other end is fixed to the energy absorbing device, wherein a piston rod of the energy absorbing device is fixed to the operating link

The insulating rod is disposed between the vacuum interrupter and the arm.