JP2989653B2 - Puffer type gas circuit breaker with closing resistance - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Object of the Invention] (Industrial application field) The present invention relates to a puffer type gas circuit breaker with a closing resistor in which the entire apparatus is reduced in size.

(Prior Art) With an increase in capacity of a power transmission system, a breaking capacity of a circuit breaker used in a substation or a switchyard is increasing, and high reliability is required. In order to increase the reliability of the circuit breaker, it is important to reduce the number of parts and simplify the structure. Therefore, the number of breaking points of the circuit breaker is reduced. For example, in the 550 KV system, a two-point puffer type gas circuit breaker with a breaking current of 50 KA has been put into practical use, and it is required to further cut it into one point.

By the way, in a puffer type gas circuit breaker for a line in a large-capacity system such as a 550 KV class, a closing resistance method is adopted in order to suppress a closing overvoltage at closing.
This is achieved by providing a closing resistance contact having a closing resistance in parallel with the main contact of the puffer type gas circuit breaker, and closing the closing resistance contact prior to the main contact at closing, and suppressing the closing overvoltage by the closing resistance. The main contact is turned on.

An example in which the puffer type gas circuit breaker adopts the closing resistance method will be described below with reference to FIG.

As shown in FIG. 6, the circuit breaker 1 is a horizontal circuit breaker, in which an arc-extinguishing chamber 2 and a resistance contact portion 3 are arranged in parallel in a gas tank 10, and the arc-extinguishing chamber 2 is connected to a resistance. One end of the contact portion 3 is connected to a gas tank 10 via a movable support 4 and an insulating cylinder 5.
It is supported by. Further, the gas tank 10 has a mechanism box 7.
And a drive unit (not shown) is housed therein. The resistance contact portion 3 includes a closing resistor 3a, a fixed electrode 3d for closing resistance connected in series with these via a supporting conductor 3c, and a movable electrode for closing resistance contact which comes in contact with and separates from the fixed electrode 3d.
3e and a supporting conductor 3f for supporting the movable supporting member 3e on the movable support 4. The fixed electrode 3d for the closing resistance contact is fixed to the support conductor 3c by a known means such as a spring 3g. The closing resistor 3a is supported by the gas tank 10 by the insulating tube 6 and the connection conductor 9.

On the other hand, the arc-extinguishing chamber 2 includes a movable electrode 2a for a main contact driven by a driving unit (not shown) provided in a mechanism box 7, a puffer cylinder 2b fixed to the main-contact movable electrode 2a, and an insulating nozzle 2c. And a main contact fixed electrode 2d and an insulating cylinder 2e. And, to the other devices, the arc extinguishing chamber movable side and the arc extinguishing chamber fixed side are connected via the connection conductor 8.

The conventional puffer type gas circuit breaker thus configured operates as described below.

When the circuit breaker is closed, first, the movable electrode 3e for closing resistance contact and the fixed electrode 3d for closing resistance contact come into contact, and the closing resistor 3a is closed in the circuit for a certain time. Thereafter, the main contact movable electrode 2a and the main contact fixed electrode 2d come into contact with each other,
3a is short-circuited, and the circuit breaker is turned on. On the other hand, at the time of interruption, first, the movable electrode 3e for closing resistance contact and the fixed electrode 3d for closing resistance contact are opened, and thereafter, the movable electrode 2a for main contact and the fixed electrode 2d for main contact are separated to be in a cutoff state.

(Problems to be Solved by the Invention) However, the conventional puffer-type gas circuit breaker with a closing resistor as described above has the following problems to be solved.

That is, since the closing resistor 3a is configured in a positional relationship parallel to the arc-extinguishing chamber 2, there is a disadvantage that the inner diameter of the gas tank 10 becomes large and a wide installation space is required.
Further, at the time of current interruption, an arc is generated between the main contact movable electrode 2a and the main contact fixed electrode 2d of the circuit breaker 1, but by blowing gas compressed by the puffer cylinder 2b along the insulating nozzle 2c. , This arc is extinguished. However, at this time, a large amount of hot gas heated by the arc is generated. Since this hot gas flows in the direction of the arrow in FIG. 6, the insulation performance in the vicinity of the insulation tube 6 disposed downstream thereof is greatly reduced, and the insulation tube having a lower insulation performance than the gas cap is provided. There is a possibility that the insulation performance in the creeping direction of 6 may decrease, and there is a defect that the insulation performance to the ground decreases immediately after the interruption.

SUMMARY OF THE INVENTION The present invention has been proposed to solve the above-mentioned drawbacks, and an object of the present invention is to provide a puffer type gas circuit breaker with a closing resistor which can reduce an installation space.

[Constitution of the invention] (Means for solving the problem) In order to achieve the above-mentioned object, the present invention provides an input resistor which is housed in a tank filled with an insulating gas and suppresses an overvoltage generated at the time of input. In a resistance contact part in which a contact and a closing resistor are connected in series, and a puffer type gas circuit breaker with a closing resistor in which main contacts of the circuit breaker are electrically connected in parallel,
On the back side of the fixed electrode support structure portion of the main contact, a plurality of closing resistors are dispersed and arranged on substantially the same circumference around the axis of the main contact in parallel with the axis of the main contact. While one end is insulated and supported by the fixed electrode support structure, the other end of the resistor is arranged between the closing resistors in parallel with the axis of the main contact, and is fixed by an insulating rod fixed to the fixed electrode support structure. It is characterized in that it is configured to be insulated and supported.

(Operation) In the puffer type gas circuit breaker with the closing resistor of the present invention, the closing resistor is divided and arranged on the back side of the fixed electrode supporting structure of the main contact, so that the entire apparatus can be reduced in size, and the closing is performed from the gas tank side. Since the structure is such that the resistor is not insulated and supported, the insulation performance to the ground immediately after the interruption of the current does not decrease.

Hereinafter, embodiments of the present invention will be described with reference to the drawings.

FIG. 1 is a sectional view of one embodiment of the present invention, FIG. 2 is a detailed view of the resistor insulating support structure of FIG. 1, FIG.
FIG. 5 and FIG. 5 are arrows AA, BB, and C in FIG.
It is sectional drawing which follows the -C line. The same parts as those of the conventional circuit breaker described above are denoted by the same reference numerals and described.

As shown in FIG. 1, the circuit breaker 1 is a horizontal circuit breaker, in which an arc-extinguishing chamber 2 and a resistance contact portion 3 are arranged in a gas tank 10 in parallel. One end of the contact portion 3 is connected to a gas tank 10 via a movable support 4 and an insulating cylinder 5.
It is supported by. Further, the gas tank 10 has a mechanism box 7.
And a drive unit (not shown) is housed therein. In addition, the resistance contact portion 3 includes a closing resistance contact fixed electrode 3d connected in series with these via a closing resistor 3a, a connection conductor 3b, and a supporting conductor 3c, a closing resistance contact movable electrode 3e that comes in contact with and separates therefrom, and And a supporting conductor 3f for supporting it on the movable support 4. Fixed electrode 3d for closing resistance contact
Is fixed to the support conductor 3c by a known means such as a spring 3g. In addition, an insulating rod is attached to the back of the fixed electrode support structure 21.
The closing resistor 3a is insulated and supported by the fixed electrode support structure portion 21 via 31, 32. As shown in FIGS. 3 and 4, the closing resistor 3a is provided on the back side of the fixed electrode supporting structure 21 on substantially the same circumference around the axis of the arc-extinguishing chamber 2 and parallel to the axis of the main contact portion. Is divided into four. As shown in FIG. 2, each of the closing resistors 3a is provided with a holding member 33, 34 also serving as an electric field relaxation shield.
Connected to. Further, the fixed electrode support structure 21 side of the closing resistor 3a is connected to the insulating rod 31, and the other end of the insulating rod 31 is inserted and supported by a fitting portion 35 provided in the fixed electrode support structure 21. I have. The other end of the closing resistor 3a is fastened to the fixed electrode support structure 21 with a fixing bolt 37, and is fixed to the fixed electrode support structure 21.
It is fastened by a fixing bolt 36 to an insulating rod 32 protruding to the back side of 21. Also, as shown in FIG. 3, one insulating rod
The structure 32 supports the two closing resistors 3a in an insulated manner. Each closing resistor 3a is electrically connected in series with a fastening portion between the insulating rod 32 and the holding member 34 and a connecting conductor 38 shown in FIG. 4, and is connected to the adjacent closing resistor 3a via the connecting conductor 3b. It is electrically connected to the support conductor 3c disposed therebetween and to the fixed electrode support structure 21 via the connection conductor 39. Further, as shown in FIGS. 4 and 5, the fixed electrode support structure
The hot gas exhaust space of the hot gas exhaust port 22 provided in 21 is arranged so that the insulating rods 31, 32 and the input resistor 3a do not block.

As described above, according to the present embodiment, the closing resistor 3a is divided and arranged on the back side of the fixed electrode support structure 21 on substantially the same circumference around the axis of the main contact in parallel with the axis of the main contact. This makes it possible to reduce the length of each of the closing resistors 3a, to arrange the closing resistors without increasing the inner diameter of the tank, and to achieve an extremely compact configuration. Further, since the hot gas exhaust port 22 provided in the fixed electrode support structure 21 is not blocked, the blocking performance and the insulating performance are excellent. Furthermore, since the insulating support structure of the closing resistor 3a is performed by a combination of the fitting configuration and the bolt fastening, the closing resistor can be easily removed from the opening on the opposite side of the mechanism box 7 of the gas tank 10, At the time of inspection of the arc-extinguishing chamber 2, a configuration with extremely good workability can be provided.

[Effects of the Invention] As described above, according to the present invention, on the back side of the fixed electrode support structure, a plurality of closing resistors are provided on substantially the same circumference centered on the axis of the main contact. Distribute parallel to the axis, insulate and support both ends of the input resistor from the fixed electrode support structure, and arrange the supporting conductor of the resistance contact portion between the adjacent input resistors, so that the inner diameter of the gas tank and The total length is reduced, and the discharge of hot gas heated by the arc generated at the time of interruption to the fixed electrode side,
Inspection work where the discharge space can be secured without disturbing the closing resistor, so there is no drop in the shutoff performance and insulation performance, and the closing resistor can be easily removed from the opening on the opposite side of the mechanism box of the gas tank. It is possible to provide a puffer-type gas circuit breaker with a closing resistance which is easy to operate and requires a small installation space.

[Brief description of the drawings]

1 is a cross-sectional view of one embodiment of the present invention, FIG. 2 is a detailed view of the resistor insulating support structure of FIG. 1, and FIGS. 3, 4, and 5 are arrows A in FIG. FIG. 6 is a sectional view taken along lines -A, BB, and CC, and FIG. 6 is a sectional view of a conventional puffer type gas circuit breaker with a closing resistor. 1 breaker 2 arc extinguishing chamber 2a movable electrode for main contact 2b puffer cylinder 2c insulating nozzle 2d fixed electrode for main contact 2e insulating cylinder 3 resistance contact Part, 3a: closing resistor 3b: connecting conductor, 3c: supporting conductor 3d: fixed electrode for closing resistor contact 3e: movable electrode for closing resistor contact 3f: supporting conductor, 3g: spring 4 ... Movable support, 5,6 ... Insulation cylinder 7 ... Mechanism box, 8,9 ... Connection conductor 10 ... Gas tank 21 ... Fixed electrode support structure 22 ... Heat gas exhaust port, 31,32 ... Insulation rod 33, 34… Holding bracket, 35… Fitting part 36, 37… Fixing bolt 38, 39… Connection conductor

────────────────────────────────────────────────── ─── Continuation of the front page (56) References JP-A-2-168523 (JP, A) JP-A-2-297826 (JP, A) JP-A-3-297022 (JP, A) (58) Field (Int.Cl. ⁶ , DB name) H01H 33/59 H01H 33/70 H01H 33/91-33/915

Claims (1)

(57) [Claims] A resistance contact portion which is housed in a tank filled with an insulating gas and is connected in series with a closing resistance contact and a closing resistor for suppressing an overvoltage generated upon closing, and a main contact of a circuit breaker. A puffer type gas circuit breaker with a closing resistor electrically connected in parallel to the main contact, on the back side of the fixed electrode support structure portion, a plurality of closing resistors on substantially the same circumference around the axis of the main contact. The resistors are distributed and arranged in parallel with the axis of the main contact, one end of the resistor is insulated and supported on the fixed electrode support structure, and the other end of the resistor is located between the input resistor and the axis of the main contact. A puffer type gas circuit breaker with a closing resistance, which is arranged in parallel and is insulated and supported by an insulating rod fixed to the fixed electrode supporting structure.