JPH0594745A - Puffer type gas circuit breaker - Google Patents

Abstract

(57) [Abstract] [Purpose] A puffer-type gas cutoff that is small in size and has high cutoff performance by averaging the gas pressure in the puffer chamber during BTF cutoff and SLF cutoff with different arc energy sizes. Provide a vessel. [Structure] A container filled with an arc extinguishing gas has contact parts 1 and 2 which can be contacted and separated. The puffer chamber 11 composed of the piston 7 and the cylinder 6 is compressed, the compressed gas is guided to the nozzle 10, and the arc 14 generated between the arc contacts 4 and 8 is extinguished. Communication hole 5a for driving rod 5 for driving the movable part
To provide. Movable arc contactor 8 near the communication hole 5a
On the opposite side, a plurality of partition plates 12 that radially divide the area of the hollow portion are arranged in a conical shape. The base of the partition plate 12 is fixed to the inner wall of the drive rod 5 via a bimetal material 13 having a low expansion material 13a and a high expansion material 13b.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an arc extinguishing chamber of a puffer type gas circuit breaker, and more particularly to a technical improvement for averaging gas pressures in the puffer chamber during different types of fault current interrupting operations.

[0002]

2. Description of the Related Art With the increase in capacity of power transmission systems, the breaking capacity required for circuit breakers used in substations and switching stations has increased, and high reliability has been required. In order to increase the reliability of the circuit breaker, it is important to reduce the number of parts and simplify the structure. From this point of view, the number of breaking points of the circuit breaker has been reduced, and for that purpose, the breaking performance of the circuit breaker must be improved and the breaking capacity per point must be increased.

In the conventional general puffer type gas circuit breaker, in order to improve the breaking performance, it is necessary to increase the gas pressure in the puffer chamber to form a strong blowing gas flow. A simple method that can be considered to achieve such a high gas pressure in the puffer chamber is to move a large puffer cylinder at a high opening speed. However, when such a method is adopted, not only the size of the arc-extinguishing chamber becomes large, but also a large drive device is required, and the economical efficiency of manufacturing and operating the circuit breaker is lost. ..

On the other hand, as a method of increasing the gas pressure in the puffer chamber without using a large puffer cylinder, the thermal energy of the generated arc is effectively used to efficiently increase the gas pressure in the puffer chamber and It is conceivable to improve the breaking performance by forming a simple blowing gas flow. As a concrete method based on such a principle, a hollow drive rod for driving a puffer cylinder is provided with a communication hole for communicating the hollow portion with the outside, and the hollow portion of the drive rod and the puffer are initially provided in the disconnection operation. A method has been devised in which an arc-extinguishing gas flow heated by an arc is introduced into the puffer chamber by communicating with the chamber via a communication hole, and the gas pressure in the puffer chamber is increased by this thermal energy. Further, in this method, in the latter stage of the shutoff operation, the hollow portion of the drive rod and the surrounding gas space are communicated with each other through the communication hole, so that the thermal energy is released to the outside of the arc extinguishing chamber.

[0005]

In the puffer type gas circuit breaker as described above, short-distance line failure (S
LF) When the current is cut off, the voltage rise rate of the transient recovery voltage applied between the circuit breaker poles after the arc is extinguished is high, and in order to prevent thermal recurrence due to this, gas blowing with a high puffer chamber pressure is applied. I know that is necessary.
On the other hand, when the breaker end fault (BTF) current is cut off, the voltage rise rate of the transient recovery voltage is lower than when the SLF is cut off, but the absolute value of the voltage is high, so the hot gas heated by the arc It is necessary to expel the electric current more quickly than between the fixed and movable contacts to accelerate the recovery of insulation between the electrodes. Therefore, at the time of shutting off the BTF current, it is possible to sufficiently shut off even at a lower puffer chamber pressure than when shutting off the SLF by optimizing the gas flow path structure.

However, as described above, the drive rod is provided with the communication hole for communicating the hollow portion with the outside, and the arc extinguishing gas flow heated by the arc is introduced into the puffer chamber to increase the gas pressure in the puffer chamber. In the puffer type gas circuit breaker, the 100% BTF breaking current (circuit breaker rated breaking current) is larger than the SLF breaking current, so the temperature of the arc extinguishing gas flow introduced into the puffer chamber becomes high and the puffer chamber breaks inside the puffer chamber. The gas pressure also increases. In particular, when cutting off an asymmetrical current containing a DC component on the large loop side (half-wave where the polarities of the DC and AC components match), the current peak value is high and the large current time before the current zero point is also high. Since it is long, the arc energy introduced into the puffer chamber becomes large,
The pressure rises further. Since such a difference between the pressure in the puffer chamber and the ambient pressure acts as a reaction force to the driving force of the movable contact portion, the required driving force becomes large, and the downsizing of the driving device cannot be achieved sufficiently. is there.

The present invention has been proposed in order to solve the above-mentioned problems, and its purpose is to cut off the fault current at the breaker end with a relatively large arc energy (when the BTF is cut off) and the arc energy. It is an object of the present invention to provide a puffer-type gas circuit breaker that is small in size and averages the gas pressure in the puffer chamber at the time of interruption of a short-distance line fault current (at the time of interruption of the SLF), and that is small in size and that can obtain high interruption performance with a small driving energy.

[0008]

A puffer-type gas circuit breaker according to the present invention has a movable contactor and a fixed contactor and a movable contactor capable of contacting and separating in a container filled with an arc-extinguishing gas. A puffer type that compresses the gas by compressing a puffer chamber consisting of a puffer piston and a puffer cylinder provided at the nozzle part and guides it to the nozzle part to cool and extinguish the arc generated between the fixed and movable arc contacts. In the gas circuit breaker, a hollow drive rod that drives the puffer cylinder is provided with a communication hole that communicates the hollow portion with the outside, and the hollow portion of the drive rod and the puffer chamber communicate with each other at the initial stage of the blocking operation. The puffer-type gas circuit breaker, in which the hollow portion of the drive rod and the container are communicated with each other through the communication hole in the latter half of the breaking operation, has the following features. That is, in the invention described in claim 1, a plurality of partition plates that divide the area of the hollow portion radially equally are provided in the hollow portion of the drive rod on the side opposite to the movable arc contact in the vicinity of the communication hole. The low expansion material arranged on the movable arc contact side and the high expansion material arranged on the opposite side are arranged at the bases of the plurality of partition plates in a conical shape with the apex facing the contact side. It is fixed to the inner wall of the drive rod through the bimetal material that it has.

According to the invention of claim 2,
In the hollow part of the drive rod, on the side opposite to the movable arc contact in the vicinity of the communication hole, a plurality of partition plates that divide the area of the hollow part radially equally are conical with the apex facing the side opposite to the movable arc contact. Drive the base parts of the plurality of partition plates through a bimetal material having a high expansion material arranged on the movable arc contact side and a low expansion material arranged on the opposite side. Stick to the inner wall of the rod.

[0010]

In the puffer type gas circuit breaker of the present invention having the above-mentioned structure, the hollow portion of the drive rod is operated when the large asymmetric current breaks at the end of the circuit breaker with large arc energy (when breaking the BTF). The high-temperature arc-extinguishing gas causes the bimetal material to be greatly curved, and the conical partition plate opens outward, allowing the high-temperature gas to escape to the gas space around the side opposite to the movable arc contactor (drive unit side). , The flow of hot gas into the puffer chamber is suppressed. On the other hand, when the arc energy is smaller than that under the above conditions, such as when the short-distance fault current is cut off (when the SLF is cut off), the outward opening of the conical partition plate is small, and the hot gas flow to the partition plate is small. Efficiently flows into the puffer room. As a result, BTF
The gas pressure in the puffer chamber at the time of shutting off and at the time of shutting off the SLF is averaged.

[0011]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment (first embodiment) of a puffer type gas circuit breaker according to the invention of claim 1 will be described below with reference to FIGS.
Will be described. In this case, FIG. 1 is a cross-sectional view showing an initial state of a breaking operation when the breaking current arc energy is relatively large as in the BTF asymmetrical current breaking, and FIG.
FIG. 7 is a cross-sectional view showing an initial state of the breaking operation when the breaking current arc energy is relatively small as in the case of LF breaking. In addition, FIG. 3 is an enlarged plan view of the conical partition plate (A).
FIG. 4B is a cross-sectional view of FIG.

First, as shown in FIGS. 1 and 2, a fixed contact portion 1 and a movable contact portion 2 are arranged facing each other in a container (not shown) filled with an arc extinguishing gas. ing.
The fixed contactor portion 1 has a fixed energization contactor 3 and a fixed arc contactor 4. The movable contact portion 2 has a hollow drive rod 5, a puffer cylinder 6 and a puffer piston 7 arranged on the outer periphery thereof, and a movable arc contact 8 arranged on the flange portion of the drive rod 5 It has a current-carrying contact 9 and an insulating nozzle 10. In this case, the drive rod 5 is connected to a drive device (not shown) provided on the side opposite to the fixed contact portion 1. The puffer cylinder 6, the movable arc contact 8, the movable energization contact 9, and the insulating nozzle 10 are attached to the drive rod 5.
Are integrally fixed, the entire structure is driven by the driving device. The puffer piston 7 of the movable contact portion 2 is fixed to a fixed portion (not shown) and forms a puffer chamber 11 between the puffer cylinder 6 and the puffer cylinder 6. It is configured to compress the chamber 11.

On the other hand, in the movable contact portion 2, the drive rod 5 has a communication hole 5 for communicating the hollow portion 5b with the outside.
a is provided. The communication hole 5a communicates the hollow portion 5b of the drive rod 5 with the puffer chamber 11 in the initial stage of the shutoff operation, and when the drive rod 5 passes through the inner diameter end portion 7a of the puffer piston 7 in the latter stage of the shutoff operation. The hollow portion 5b is connected to the surrounding gas space.

A conical partition plate 12 is arranged on the opposite side (driving device side) of the movable arc contactor 8 in the vicinity of the communication hole 5a so that its apex faces the movable arc contactor 8 side. There is. This conical partition plate 12 is shown in FIG.
Further, as shown in (B), the hollow portion 5b of the drive rod 5 is composed of eight partition pieces 12a formed by radially dividing the cross section into eight parts. And such a partition 12a
The conical partition plate 12 made of is fixed to the inner wall of the drive rod 5 with the bimetal material 13 as a base. As shown in FIG. 3B, this bimetal material 13 has a low expansion material 13a such as tungsten arranged on the outer side corresponding to the movable arc contact 8 side, and on the inner side corresponding to the opposite side. For example, a high expansion material 13b such as copper is arranged. Further, in FIG. 3A, 12b is an opening formed at the tip of the conical partition plate 12.

The operation of the puffer type gas circuit breaker of the first embodiment having the above construction will be described below. First, Fig. 1
As described above, indicates the initial state of the breaking operation when the breaking current arc energy is large as in the BTF asymmetrical current breaking. In this state, the arc 14 generates a large amount of heat, and a part of the expansion flow of the gas from the arc 14 and the hot gas flow 15 a ejected from the opening of the insulating nozzle 10 to the external space and the insulating nozzle 10. And a hot gas flow 15b flowing into the inside of the drive rod 5 and a hot gas flow 15c flowing through the hollow portion 5b of the drive rod 5. In this case, since the arc energy is large, the temperatures of these hot gas streams 15a to 15c are high.

Then, such a high temperature hot gas flow 15a
15c, the conical partition plate 12 mounted on the hollow portion 5b of the drive rod 5 and the bimetal material 1 at the base thereof by the hot gas flow 15c flowing through the hollow portion 5b of the drive rod 5.
3 is heated. In this case, the bimetal material 13 at the base of the conical partition plate 12 has the low expansion material 13a outside and the high expansion material 13b inside, so that the hot gas flow 15c
When heated, it bends outward. As a result, as shown in FIG. 1, the opening 12b at the tip of the conical partition plate 12 is greatly opened, and a part of the hot gas flow 15c flowing through the hollow portion 5b passes through the inner side of the conical partition plate 12. And is released into the surrounding gas space. Therefore, hot gas flow 1
The amount of 5c flowing into the puffer chamber 1 is reduced. Moreover,
In this case, since the conical partition plate 12 is deformed so as to close the communication hole 5a between the hollow portion 5b of the drive rod 5 and the puffer chamber 11, the inflow amount of the hot gas flow 15c into the puffer chamber 11 is further suppressed. It As a result, the puffer chamber 1 generated when the hot gas flow 15c flows into the puffer chamber 11
Since the pressure rise in 1 is suppressed, an excessively high pressure is not generated in the puffer chamber 11. Therefore, since an excessive reaction force with respect to the driving force of the movable contactor portion 2 is not generated, the required driving force can be reduced and the driving device can be downsized.

On the other hand, as when shutting off the SLF, the arc 14
When the energy of the conical partition plate 12 is relatively low, the temperature of the hot gas flow 15c flowing through the hollow portion 5b of the drive rod 5 is relatively low.
2 and even if the base bimetal material 13 is heated,
As shown in, the amount of bending of the bimetal material 13 is small. In this case, since the opening diameter of the opening 12b at the tip of the conical partition plate 12 becomes small, the hot gas flow 15 to the surrounding gas space 15
The amount of c released decreases. In addition, since the apex of the conical partition plate 12 is directed toward the movable arc contactor 8 side, the outer surface of the partition plate 12 drives the hot gas flow 15c into the driving rod 5
Of the hot gas flow 15
c efficiently flows into the puffer chamber 11 through the communication hole 5a. Therefore, the pressure of the puffer chamber 11 is increased by the thermal energy of the hot gas flow 14c, and a high shutoff performance is obtained.

More specifically, in the present embodiment, since the conical partition plate 12 is arranged as a partition plate in the hollow portion 5b of the drive rod 5, the opening at the tip of the conical partition plate 12 is provided. The diameter dimension of the portion 12b can be adjusted according to the change in the amount of bending of the bimetal material 13 at the base portion. Therefore, by appropriately setting the configuration of the bimetal material 13 so that the diameter dimension of the opening 12b of the conical partition plate 12 can be appropriately adjusted according to the temperature of the hot gas flow 15c, the temperature of the hot gas flow 15c can be adjusted. Accordingly, an appropriate amount thereof can be released to the surrounding gas space or the released amount can be suppressed to average the pressure in the puffer chamber 11.

In particular, the high expansion material 13b of the bimetal material 13
As described above, when copper is used as described above, since the specific heat is small and the thermal conductivity is large, the temperature of the same portion, that is,
The amount of bending of the bimetal material 13 can be instantly and highly accurately changed according to the temperature change of the hot gas flow 15c.
Therefore, the diameter of the opening 12b at the tip of the conical partition plate 12 is instantly and accurately changed according to the temperature change of the hot gas flow 15c, that is, the energy amount of the breaking current arc during the high-speed breaking operation. Therefore, as described above, the amount of arc energy to the puffer chamber 11 can be instantly and appropriately adjusted.

Next, an embodiment (second embodiment) of the puffer type gas circuit breaker according to the present invention will be described with reference to FIGS. 4 to 6. In this case, FIG. 4 is a cross-sectional view showing an initial state of the breaking operation when the breaking current arc energy is relatively large like BTF asymmetrical current breaking, and FIG.
FIG. 6 is a cross-sectional view showing an initial state of a breaking operation when the breaking current arc energy is relatively small as in the case of F breaking. Further, FIG. 6 is an enlarged sectional view of the conical partition plate (A).
FIG. 6B is a plan view of FIG. In the second embodiment, the configuration of the other parts except the conical partition plate 12 and the bimetal material 13 is the same as that of the first embodiment, and therefore, the same parts are designated by the same reference numerals and will not be described. Is omitted.

That is, as shown in FIGS. 4 and 5, on the side opposite to the movable arc contactor 8 (driving device side) in the vicinity of the communication hole 5a of the drive rod 5, contrary to the first embodiment, A conical partition plate 12 is arranged so that its apex faces the side opposite to the movable arc contactor 8 (driving device side). Similar to the first embodiment, the conical partition plate 12 is formed by radially dividing the cross section of the hollow portion 5b of the drive rod 5 into eight, as shown in FIGS. 6 (A) and 6 (B). 12 pieces of partition
a, with the bimetal material 13 as the base,
It is fixed to the inner wall of the drive rod 5. In addition, this bimetal material 13 is, in this embodiment, as shown in FIG.
As shown in, the high expansion material 13b such as copper is arranged inside the movable arc contactor 8 side, and the low expansion material 13a such as tungsten is arranged outside the opposite side. It is configured. That is, the arrangement of the high expansion material 13b and the low expansion material 13a is opposite to that of the first embodiment in relation to the movable arc contact 8, but the high expansion material 13b is inside and the low expansion material 13a is outside. The arrangement is the same as in the first embodiment.

The operation of the puffer type gas circuit breaker of the second embodiment having the above construction is basically the same as that of the first embodiment. That is, when the breaking current arc energy is large as in the BTF asymmetrical current breaking, as shown in FIG. 4, the hollow portion 5 of the drive rod 5 is driven by the hot gas flow 15c flowing through the hollow portion 5b of the drive rod 5.
The conical partition plate 12 mounted on b and the bimetal material 13 at the base thereof are heated. In this case, since the low expansion material 13a is arranged on the outer side and the high expansion material 13b is arranged on the inner side of the bimetal material 13 at the base of the conical partition plate 12, as in the first embodiment, the hot gas flow 15c Bends outward when heated. As a result, as shown in FIG. 4, the conical partition plate 1
The opening 12b at the tip of 2 opens widely, and a part of the hot gas flow 15c flowing through the hollow portion 5b is part of the conical partition plate 12.
Is released into the surrounding gas space via the inside of the. Therefore, the amount of the hot gas flow 15c flowing into the puffer chamber 1 is reduced by this amount of discharge. As a result, an increase in pressure in the puffer chamber 11 caused by the hot gas flow 15c flowing into the puffer chamber 11 is suppressed, so that an excessively high pressure is not generated in the puffer chamber 11. Therefore, since an excessive reaction force with respect to the driving force of the movable contactor portion 2 is not generated, the required driving force can be reduced and the driving device can be downsized.

On the other hand, as when shutting off the SLF, the arc 14
When the energy of the conical partition plate 12 is relatively low, the temperature of the hot gas flow 15c flowing through the hollow portion 5b of the drive rod 5 is relatively low.
Even if the bimetal material 13 at the base and its base is heated, as shown in FIG.
As shown in, the amount of bending of the bimetal material 13 is small. In this case, the opening diameter of the opening 12b at the tip of the conical partition plate 12 becomes small, and the amount of the hot gas flow 15c released to the surrounding gas space decreases, so that the hot gas flow 15c flows into the puffer chamber 11 accordingly. The amount of hot gas stream 15c can be increased. Therefore, the pressure of the puffer chamber 11 is increased by the thermal energy of the hot gas flow 15c, and high shutoff performance is obtained.

The present invention is not limited to the above-mentioned embodiments, and for example, the materials of the low expansion material and the high expansion material used for the bimetal material can be appropriately selected. Also,
In each of the above-described embodiments, the conical partition plate is composed of eight partition pieces formed by radially dividing the cross section of the drive rod into eight pieces, but the number of partition pieces can be changed as appropriate and is set to 7 or less. It is also possible to do so, or a configuration with nine or more divisions.

[0025]

As described above, according to the present invention, a conical partition plate is provided in the hollow portion of the drive rod, and a simple construction in which a bimetal material is used at the base of the partition plate makes it possible to reduce the arc. To provide a puffer-type gas circuit breaker that is small in size and has a high breaking performance by a small driving energy by averaging the gas pressure in the puffer chamber at the time of breaking a relatively large BTF energy and breaking an SLF having a relatively small arc energy. You can

[Brief description of drawings]

FIG. 1 is a sectional view showing an initial state of a breaking operation when a breaking current arc energy is relatively large in a first embodiment of a puffer type gas circuit breaker according to the present invention.

2 is a cross-sectional view showing an initial state of a breaking operation in the puffer type gas circuit breaker of FIG. 1 when the breaking current arc energy is relatively small.

3 is a plan view and a cross-sectional view showing an enlarged conical partition plate used in the puffer type gas circuit breaker of FIG. 1. FIG.

FIG. 4 is a cross-sectional view showing an initial state of the breaking operation when the breaking current arc energy is relatively large in the second embodiment of the puffer type gas circuit breaker according to the present invention.

5 is a cross-sectional view showing the initial state of the breaking operation in the puffer type gas circuit breaker of FIG. 4 when the breaking current arc energy is relatively small.

6 is an enlarged sectional view and plan view of a conical partition plate used in the puffer type gas circuit breaker of FIG. 4.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 ... Fixed contact part 2 ... Movable contact part 3 ... Fixed current contact 4 ... Fixed arc contact 5 ... Drive rod 5a ... Communication hole 5b ... Hollow part 6 ... Puffer cylinder 7 ... Puffer piston 8 ... Movable arc contact 9 ... Movable energizing contact 10 ... Insulation nozzle 11 ... Puffer chamber 12 ... Conical partition plate 12a ... Partition 12b ... Opening 13 ... Bimetal material 13a ... Low expansion material 13b ... High expansion material 14 ... Arc 15a-15c ... Heat Gas flow

Claims (2)

[Claims] 1. A puffer including a puffer piston and a puffer cylinder provided in a movable contact part, having a fixed contact part and a movable contact part which can be contacted and separated, in a container filled with an arc-extinguishing gas. A puffer type gas circuit breaker for compressing gas by guiding a chamber to guide it to the nozzle part and cooling and extinguishing the arc generated between the fixed and movable arc contacts, which is a hollow for driving the puffer cylinder. -Like drive rod is provided with a communication hole that communicates the hollow portion with the outside, and the hollow portion of the drive rod and the puffer chamber are communicated with each other through the communication hole at the initial stage of the blocking operation, and at the latter stage of the blocking operation. Is a puffer-type gas circuit breaker for communicating the hollow portion of the drive rod and the container through a communication hole, wherein the hollow portion of the drive rod is opposite to the movable arc contactor near the communication hole. On the side, a plurality of partition plates that equally divide the area of the hollow portion radially are arranged in a conical shape with the apex facing the movable arc contactor side, and the bases of the plurality of partition plates are connected to the movable arc contact. A puffer type gas circuit breaker, characterized in that it is fixed to the inner wall of the drive rod through a bimetal material having a low expansion material arranged on the child side and a high expansion material arranged on the opposite side. 2. A puffer having a puffer piston and a puffer cylinder provided in the movable contactor, having a fixed contactor and a movable contactor capable of contacting and separating in a container filled with an arc extinguishing gas. A puffer type gas circuit breaker for compressing gas by guiding a chamber to guide it to the nozzle part and cooling and extinguishing the arc generated between the fixed and movable arc contacts, which is a hollow for driving the puffer cylinder. -Like drive rod is provided with a communication hole that communicates the hollow portion with the outside, and the hollow portion of the drive rod and the puffer chamber are communicated with each other through the communication hole at the initial stage of the blocking operation, and at the latter stage of the blocking operation. Is a puffer-type gas circuit breaker for communicating the hollow portion of the drive rod and the container through a communication hole, wherein the hollow portion of the drive rod is opposite to the movable arc contactor near the communication hole. On the side, a plurality of partition plates which equally divides the area of the hollow portion radially arranged in the form of a conical directing vertex on the opposite side of the movable arcing contact, and,
The bases of the plurality of partition plates are fixed to the inner wall of the drive rod through a bimetal material having a high expansion material arranged on the movable arc contact side and a low expansion material arranged on the opposite side. Puffer type gas circuit breaker.