JPH065166A - Circuit breaker with resistance - Google Patents

Abstract

(57) [Abstract] [Purpose] There is no waste of simply enlarging the main contact part to simply support the resistor, and the resistor can be stably supported with a small and simple structure. Provided is an excellent circuit breaker with a resistance, which is suitable and can contribute to reduction in size and weight. [Configuration] In a closed container 12 filled with an insulating medium,
It has two sets of main contacts 1, a resistance contact 2 and a resistor 3. A conductive support structure 8 is arranged between the two sets of main contacts 1 in the closed container 12, and is supported by the closed container 12 via the first support insulator 4. Two sets of main contacts 1 are supported on both sides of the support structure 8. The resistors 3 are arranged in two parts, and one end of each of the two resistors 3 has a support structure 8
Is supported via the second support insulator 5. The other ends of the two resistors 3 are supported by the closed container 12 via a third support insulator 6.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a circuit breaker with a resistor used in a substation of a high-voltage power system, and more particularly to a resistor support structure.

[0002]

2. Description of the Related Art In a substation of a high-voltage power system, a circuit breaker is used in which a tank filled with an insulating medium such as gas contains a breaking unit including a main contact. Among such circuit breakers, in a 500 kV gas circuit breaker, when a non-loaded transmission line is turned on, a large overvoltage is generated, and thus a resistor may be used to suppress this. In this case, the arc-extinguishing chamber is turned on after the resistor is inserted about 10 ms before the turning-on of the arc-extinguishing chamber as the main contact to suppress the overvoltage. At this time,
The energy consumed by the resistor is about several MJoule, and the volume and weight of the resistor are extremely small compared to the main contact. Then, such a small and lightweight resistor can be arranged in parallel with the main contact and easily supported by the main contact portion.

[0003]

By the way, in recent years, the higher voltage of the power transmission system has been advanced, and an ultra-high voltage (UHV) power transmission system of 1000 kV is also planned. In such a UHV gas circuit breaker, with the development of the breaking technology in recent years, it is attempted to cope with the two-point break main contact.
In addition, not only when the power is turned on, but also when the power is turned off, a resistor is inserted in the circuit to reduce the overvoltage and reduce the insulation level of the entire system.

In the resistor used in such a UHV circuit breaker, the energy to be processed becomes extremely large. Specifically, it is 20 to 20 compared with the resistor of the 500 kV circuit breaker described above. It is necessary to absorb 30 times as much energy. As a result, both the volume and weight of the resistor are higher than those of the 500 kV circuit breaker resistor.
It is 20 to 30 times larger. Therefore, the resistor cannot be easily supported by the main contact portion. That is, in order to support such a large and heavy resistor with the main contact part, the main contact part must be enlarged only for that purpose, which leads to an increase in the size and weight of the entire device, which leads to cost reduction. Is also inconvenient. Further, when such a large resistor is used, the resistor vibrates greatly during operation of the circuit breaker or during an earthquake, and it is difficult to stably support the resistor.

On the other hand, the UHV circuit breaker is larger in size than the 500 kV circuit breaker, and the operating temperature range is much wider than the operating temperature range of the 500 kV circuit breaker. Is assumed. In this case, each part of the circuit breaker thermally expands and contracts with a change in temperature, but the thermal expansion coefficient differs between the tank side and the charging part side including the breaking part because of different thermal expansion coefficients. Such a difference in the amount of thermal expansion and contraction is hardly a problem in a small-sized device having a narrow operating temperature range, but the UHV circuit breaker is large in size and has a wide operating temperature range as described above. The difference in the amount of thermal expansion and contraction in the axial direction between the charging section and the charging section side including the blocking section is large enough to mechanically affect the surrounding structure. That is, since the charging unit including the blocking unit is supported in a state of being electrically insulated from the tank by the support insulator, the amount of thermal expansion and contraction between the tank side and the charging unit side as described above. The difference adds extra stress to the supporting insulator. Further, due to such thermal expansion and contraction of the tank or the charging part, extra stress is applied to the resistor.

The present invention has been proposed in order to solve the problems of the prior art as described above, and an object thereof is to simply increase the size of the main contact portion to support the resistor. Since it is possible to stably support the resistor with the smallest possible size and simple structure, it is suitable for UHV and small size.
It is to provide an excellent circuit breaker with resistance that can contribute to weight reduction.

[0007]

A circuit breaker with resistance according to the present invention comprises a breaking portion including two sets of main contacts in a closed container filled with an insulating medium, and a breaking circuit generated when opening and closing. In a circuit breaker with resistance, which includes a resistance contact and a resistance body for suppressing a closing surge, a conductive support structure is arranged between the two sets of main contacts in the closed container,
The sealed container is supported via a first supporting insulator, the two sets of main contacts are supported on both sides of the supporting structure, and the resistor is divided into two parts.
One end of each of the two resistors is supported by the support structure via a second support insulator, and the other end of the two resistors is supported by the sealed container via a third support insulator. It is characterized by being supported by.

In this case, as the supporting insulator, generally,
An insulating tube is used. For example, it is possible to use an insulating cylinder as the second supporting insulator and arrange the resistance contact inside the insulating cylinder. Further, a displacement amount absorbing means that absorbs a relative displacement amount is provided between the selected support insulator among the first to third support insulators and the support structure, the closed container, or the resistor. A configuration is also possible.

[0009]

In the present invention configured as described above, the resistor body is divided into two, and the two resistor bodies are respectively provided at both ends thereof with the support structure and the hermetically sealed container by the second and third support insulators. Since it is supported against, it is possible to stably support the entire resistor. In the present invention,
The first support insulator and the conductive support structure are means for supporting both the resistor and the main contact, and the third support insulator is also means for supporting the main contact or the electrical connection between the resistor and the main contact. Since it is possible to serve also as the support means of the connection portion, the support means dedicated to the resistor is substantially only the second support insulator, and the configuration is simple. Furthermore, when an insulating cylinder is used as the second supporting insulator and a resistance contact is arranged inside the insulating cylinder, the entire device can be downsized by omitting the space for disposing the resistance contact. . on the other hand,
When displacement amount absorbing means is provided between the selected supporting insulator of the first to third supporting insulators and the supporting structure, the closed container, or the resistor, the closing is accompanied by a temperature change. When a difference in thermal expansion / contraction amount occurs between the container side and the charging unit side including the blocking unit, the displacement amount absorbing unit can absorb the difference in thermal expansion / contraction amount.

[0010]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A plurality of embodiments of the circuit breaker with resistance according to the present invention will be specifically described below with reference to FIGS.

FIG. 1 is a block diagram showing a typical embodiment (first embodiment) of a circuit breaker with a resistor according to the present invention. As shown in FIG. 1, the circuit breaker of this embodiment has two sets of main contacts 1 having a puffer type arc-extinguishing chamber, two sets of resistance contacts 2 and a resistor 3 divided into two. Have. In addition, as an insulator, a main insulating cylinder (first supporting insulator) 4,
A resistor support insulating cylinder (second supporting insulator) 5, an auxiliary insulating cylinder (third supporting insulator) 6, and an insulating spacer 7 for gas separation from an adjacent device are provided. Further, in the figure, 8 is a center piece corresponding to a conductive support structure, 9 is a resistor supporting metal member, 10 is an auxiliary metal member, and 11 is a conductor. Each of the above elements is housed in a gas tank (closed container) 12 filled with an insulating gas.

That is, the center piece 8 is fixed on the main insulating cylinder 4 established from the grounded gas tank 12, and two sets of main contacts 1 are arranged on both sides of the center piece 8 coaxially with the gas tank 12. And is mechanically fixed to the center piece 8 and electrically connected. The two resistors 3 are arranged above the two main contacts 1 in the same direction as the main contacts 1 (and thus in the same direction as the gas tank 12). One end of the resistor 3 is supported and fixed to the center piece 8 via the resistor support insulating cylinder 5 and the resistor support metal member 9 supported on the upper portion of the center piece 8. The other end of the resistor 3 is connected to the gas tank 1
The auxiliary metal member 10 is provided on the auxiliary insulating cylinder 6 established from 2.
It is supported and fixed via. In this case, the auxiliary metal member 10 is electrically and mechanically connected to one end of the main contact 1 on the side opposite to the center piece 8, and is electrically connected to the conductor 11 for external drawing. Conductor 11
Are drawn out through the insulating spacer 7.
In addition, in the internal space of the resistor support insulating cylinder 5, the resistance contact 2
Are arranged coaxially.

In the present embodiment having the above-mentioned structure, the resistor 3 is divided into two, and the two resistor bodies 3 are centered by the resistor body supporting insulating cylinder 5 and the auxiliary insulating cylinder 6 at both ends thereof. Since the piece 8 and the gas tank 12 are supported, the resistor 3 as a whole can be stably supported. Therefore, the vibration of the resistor 3 does not increase even during the operation or the earthquake, and the mechanical reliability is excellent.

Further, in this embodiment, the main insulating cylinder 4 and the center piece 8 are used for mechanically supporting and fixing the main contact 1 and electrically connecting them, and the auxiliary insulating cylinder 6 and the auxiliary metal. The member 10 mechanically supports and fixes one end of the resistor 3 and at the same time mechanically supports one end of the main contact 1 and the conductor 11, and thus, the resistor 3 and the main contact 1 and the conductor 11.
Is electrically connected to the gas tank 12 while maintaining insulation. Therefore, in this embodiment, the support means dedicated to the resistor 3 is substantially only the resistor support insulating cylinder 5 and the resistor support metal member 9, and as is clear from FIG. Extremely small and simple. That is, in this embodiment, since the resistor 3 can be stably supported by the above-mentioned small and simple support structure, the structure of the main contact 1 part is enlarged only for supporting the resistor 3. There is no such waste, and it can contribute to the reduction in size and weight of the circuit breaker as a whole. Particularly, in this embodiment, since the resistance contact 2 is arranged inside the resistor support insulating cylinder 5, the space for disposing the resistance contact 2 can be further omitted, which further contributes to downsizing of the circuit breaker as a whole. it can.

FIG. 2 is a block diagram showing another embodiment (second embodiment) of the circuit breaker with a resistor according to the present invention. The configuration of the second embodiment is basically the same as that of the first embodiment, but in this embodiment, the resistance contact 2 is not arranged inside the resistor support insulating cylinder 5, It is arranged at a location not shown. With such a structure, an extra space for disposing the resistance contact 2 is required as compared with the above embodiment, but there is an advantage that the assembling work and the inspection work of the resistance contact part can be simplified.

Next, FIG. 3 is a block diagram showing another embodiment (third embodiment) of the circuit breaker with resistance according to the present invention.
The structure of the third embodiment is basically the same as that of the first embodiment, but in this embodiment, as shown by A in FIG. On the other hand, it is supported via a flange (displacement amount absorbing means) 13. FIG. 4 is an enlarged view of the portion A of FIG. 3 as described above. A flange 13 having an L-shaped cross section is fixed to the bottom surface of the gas tank 12 by a bolt 13a, and a lower end portion of the auxiliary insulating cylinder 6 is formed on the flange 13. It is formed in an L-shaped cross-section so as to be combined with the L-shaped, and is slidably fitted to the flange 13 so as to be slidable in the axial direction of the gas tank 12.

In the present embodiment having such a structure, even when the difference in the amount of thermal expansion and contraction in the axial direction between the gas tank 12 side and the charging portion side including the main contact 1 becomes large due to the temperature change, By sliding the lower end of the auxiliary insulating cylinder 6 in the axial direction of the gas tank 12, it is possible to absorb the difference in the amount of thermal expansion and contraction in the axial direction. Therefore, extra stress is not applied to the insulating cylinders 4 to 6 and the resistor 3, and the mechanical reliability can be improved. Further, as a modified example of the present embodiment, a configuration in which a similar slide structure is provided on the charging portion side of the auxiliary insulating cylinder 6 is also possible. Furthermore, the resistor support insulating cylinder 5
It is also possible to provide the main insulating cylinder 4 with a similar slide structure.

Finally, FIG. 5 is a configuration diagram showing another embodiment (fourth embodiment) of the circuit breaker with resistance according to the present invention.
The structure of the fourth embodiment is basically the same as that of the first embodiment, but in this embodiment, a spring (displacement amount absorbing means) 14 is provided between the resistor 3 and the auxiliary metal member 10. The auxiliary metal member 10 and the resistor 3 are supported by the spring 14 so as to be relatively displaceable in the axial direction. In the present embodiment having such a configuration, even if the difference in the amount of thermal expansion and contraction in the axial direction between the gas tank 12 side and the charging section side including the main contact 1 increases with the temperature change, the resistor By relatively displacing 3 and the auxiliary metal member 10 in the axial direction, it is possible to absorb the difference in the thermal expansion / contraction amount in the axial direction. Therefore, similar to the above-described embodiment, no extra stress is applied to the insulating cylinders 4 to 6 and the resistor 3, and the mechanical reliability can be improved. Further, as a modified example of the present embodiment, it is also possible to arrange a similar spring 14 between the resistor 3 and the resistor supporting metal member 9. Furthermore, spring 1
It is also possible to use another elastic means such as fingers instead of four.

The present invention is not limited to the above embodiments, the supporting insulator is not limited to an insulating cylinder, and a columnar or rod-like insulator is appropriately arranged. Is also possible. Further, the structure of the support structure can be freely changed, and the specific structures of the main contact and the resistance contact can be freely selected.

[0020]

As described above, according to the present invention,
The conductive support structure supports the two sets of main contacts, the resistor is divided into two, and the two resistors are respectively supported by the support insulators at both ends thereof with respect to the support structure and the closed container. As a result, there is no waste of enlarging the main contact portion simply to support the resistor, and the resistor can be stably supported with a small and simple structure.
It is possible to provide an excellent circuit breaker with resistance, which is suitable for V and can contribute to size and weight reduction.

[Brief description of drawings]

FIG. 1 is a configuration diagram showing a typical embodiment (first embodiment) of a circuit breaker with a resistor according to the present invention.

FIG. 2 is a configuration diagram showing another embodiment (second embodiment) of the circuit breaker with resistance according to the present invention.

FIG. 3 is a configuration diagram showing another embodiment (third embodiment) of the circuit breaker with resistance according to the present invention.

FIG. 4 is an enlarged view of part A in FIG.

FIG. 5 is a configuration diagram showing another embodiment (fourth embodiment) of the circuit breaker with resistance according to the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 ... Main contact 2 ... Resistive contact 3 ... Resistor 4 ... Main insulating cylinder (1st supporting insulator) 5 ... Resistor supporting insulating cylinder (2nd supporting insulator) 6 ... Auxiliary insulating cylinder (3rd supporting) Insulator) 7 ... Insulating spacer 8 ... Center piece (conductive support structure) 9 ... Resistor supporting metal member 10 ... Auxiliary metal member 11 ... Conductor 12 ... Gas tank (sealed container) 13 ... Flange (displacement absorption means) 14 ... Spring (displacement amount absorbing means)

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Hiroshi Sato 2-1, Ukishima-cho, Kawasaki-ku, Kawasaki-shi, Kanagawa, Ltd. Hamakawasaki Plant, Toshiba Corporation (72) Norimitsu Kato, No. 2 Ukishima-cho, Kawasaki-ku, Kawasaki-shi, Kanagawa No. 1 stock company Toshiba Hamakawasaki factory

Claims (3)

[Claims] 1. A closed container filled with an insulating medium,
A circuit breaker with resistance, comprising a breaking portion including two sets of main contacts, and a resistance contact and a resistor for suppressing a breaking / make-up surge generated at the time of opening and closing, wherein the two sets of main contacts in the closed container. An electrically conductive support structure is disposed between the first and the second container with respect to the closed container.
Of the support structure, the two sets of main contacts are supported on both sides of the support structure, the resistors are divided into two, and one end of the two resistors is The second resistor is supported by a support structure through a second support insulator, and the other ends of the two resistors are third with respect to the closed container.
A circuit breaker with a resistance, which is supported via a supporting insulating material. 2. The circuit breaker with resistance according to claim 1, wherein an insulating cylinder is used as the second supporting insulator, and the resistance contact is arranged inside the insulating cylinder. 3. A displacement that absorbs a relative amount of displacement between a selected one of the first to third supporting insulators and the supporting structure, the closed container, or the resistor. 2. The circuit breaker with resistance according to claim 1, further comprising quantity absorbing means.