JPH0746551B2 - Shinya - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION Object of the Invention (Field of Industrial Use) The present invention relates to a circuit breaker of a type in which a closing resistor is changed to two types when a circuit breaker is turned on, and a closing overvoltage is suppressed. The present invention relates to a circuit breaker that improves the reliability and make-up of contact points and improves the workability of contact inspection during periodic inspection of circuit breakers.

(Prior art) Switching overvoltage of a switch in a transmission system of 500 KV or more,
In particular, in order to suppress the closing overvoltage when the breaker is closed, a resistance closing method is adopted for the line breaker. Furthermore, in recent years, due to the improved breaking performance of circuit breakers, the switchgear has been made smaller as seen in the advent of the rated voltage 550KV 2-point open and 420KV 1-point open GCB. The impulse and allowable switching surge levels are reduced, and the economic efficiency of the entire system is improved.

(Problems to be Solved by the Invention) Against this background, the performance required of the circuit breaker is miniaturization, reduction of switching overvoltage, and improvement of workability at the time of regular inspection. Also, as the background of downsizing and reduction of switching overvoltage, line breakers that require a closing resistance method are generally about 1/3 of the required number of breakers, and the remaining 2/3
Economical downsizing cannot be achieved without standardization of circuit breakers with specifications that do not require a closing resistance method.

The present invention has been made in view of the above background and problems, and provides a circuit breaker that is compact and standardized, and has a structure that improves the reliability of the circuit breaker with a reduced allowable surge level and the workability during periodic inspection. The purpose is to do.

[Structure of Invention]

(Means for Solving the Problems) In the present invention for achieving the above object, the closing resistance first contact is arranged in parallel with the breaking portion fixed contact, and the second contact is arranged behind the fixing portion. One electrode of the second closing resistance contact is supported by a supporting insulating cylinder, and the resistor is supported at two or more places.

(Operation) By removing the resistor from the end cover of the circuit breaker tank, the resistor can be detached and attached as a unit at the time of regular inspection. Therefore, workability of inspection work can be improved and labor can be saved.

(Embodiment) An overall configuration of an embodiment of the present invention is shown in FIG. 1, and an integrated disassembly state of an end cover and a resistor at the time of inspection of the present invention is shown in FIG.

In FIG. 1, the shut-off portions 2 and 3 are housed inside the tank 1, and a first closing resistance contact 18 is provided in parallel with the fixed main energization portion 6 side of the closing portion, and the first closing resistance contact 18 swings. In the configuration in which the second closing resistance contact movable portion 7, which rotates on the same axis as the rotation axis of the insulating lever 17, the fixed portion 9, and the closing resistors 8 and 13 are arranged behind the fixed main energizing portion 6 side, 2 Closing resistance contact fixing part 9 is fixed to the lid 11 which is the ground side of the tank 1 with the support insulator 10, and the closing resistance is made as a separate unit.
At least one of 8, 13 except for the supporting insulator 10
It is supported by one or more supporting insulators, eg 14. On the other hand, the other closing resistor 8 is fixed to the lid on the ground side by the supporting insulator 10, and the other end thereof is electrically connected to the fixed main conducting part 6 side and mechanically connected at the current collecting connection part. Support structure.

In the above structure and configuration, the current collecting connection between the first closing contact contact 15 of the first closing resistance contact 18 and the first closing contact sliding energization section 16 and the fixed main energization section 6 side of the closing resistor 8 is When the lid 11 is attached / detached, the structure is such that it can be detached / moved in the axial direction of the tank 1.

When the circuit breaker is turned on, the fixed and movable arc contacts of the main circuit 1
Prior to 9,20, the first closing resistance contact 18 is turned on to the movable main energization section 5, the closing resistors 8 and 13 are turned on in series, and after the system voltage oscillation time of several msec, the second closing resistance contact is made. The movable part 7 is thrown into the fixed part 9, the closing resistor 8 is short-circuited, and a few ms
After ec, the fixed and movable arc contacts 19 and 20 are closed, both closing resistors 8 and 13 are short-circuited, and the closing operation is completed. In this case, when the first closing resistance contact is closed, the impact force received by the first closing contact sliding current-carrying portion 16 and the impact force when the second closing resistance contact movable and fixed portions 7, 9 are closed are set to the closing resistor 13, Supporting the supporting insulators 14 and 10 without applying the voltage to 8 can eliminate factors such as damage to the closing resistor. Since the circuit breaker has a duty to make a short circuit, its closing speed is generally 3 to 6 m / s.
There is about ec, and a considerable impact force is generated. This becomes damage to the closing resistor as the number of operations increases,
Impairs credibility.

The workability of disassembling and assembling at the time of regular inspection will be described with reference to FIG. The circuit breaker undergoes a contact inspection after a predetermined number of years of operation, number of operations, and history of interruption, which is generally a fixed-position inspection at the installation site and is executed in a relatively short time. In this case, the closing resistor as in the present invention
8,13 and a part of the closing resistance contact part
By fixing to the lid 11 on the side surface of the tank 1 as a unit, the workability of the disassembling and assembling work can be greatly improved, and the work time can be shortened and the reliability of the inspection work can be improved.

〔The invention's effect〕

It is possible to obtain a circuit breaker that has improved workability during on-site periodic inspections, and is compatible with the miniaturization and standardization of circuit breakers due to the strengthening of insulation coordination and the reduction of insulation levels.

[Brief description of drawings]

FIG. 1 is a sectional view of a circuit breaker according to an embodiment of the present invention, and FIG. 2 is a view for explaining attachment / detachment of the closing resistor shown in FIG. 1 ... Tank, 2, 3 ... Interrupting part 5 ... Movable main energizing part, 6 ... Fixed main energizing part 7 ... Second closing resistance contact moving part 8 ... Making resistor 9 ... Second closing resistance contact fixing part 10 ... Support insulation 11 ... Lid 13 ... Make-up resistor, 14 ... Supporting insulator 15 ... First make-up contact contactor 16 ... First make-up contact sliding energizer 17 ... Insulation oscillating lever, 18 ... First make-up resistance contact 19 ... Fixed arc contact, 20… movable arc contact

Claims (1)

[Claims] 1. An arc extinguishing unit comprising a fixed part and a movable part arranged in a tank, a closing resistor axially arranged with the fixed part, and a resistor arranged separately in a plurality of units. A circuit breaker having a second closing contact part which is adapted to perform a closing operation by changing the resistance value to a plurality of values after the entire resistance is turned on by the first closing contact when the closing resistor is turned on at a separation position. The charging unit for separating the closing resistor into a plurality of units and attaching the second closing contact is supported by a supporting insulator, and the resistors separated into a plurality of units are supported by at least two supporting insulators. While supporting the case on earth potential and attaching the lid of the tank to the supporting insulator, the resistor of the preceding paragraph and the electrode portion of the second making contact can be detached or attached integrally when the lid is detached. Shutoff characterized by .