JPS59817A - Breaker - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION [Technical Field of the Invention] The present invention relates to a circuit breaker in which the arrangement structure of switching overvoltage suppressing resistors is improved.

[Technical background of the invention and its problems]

In order to suppress the switching overvoltage of a circuit breaker, especially the closing overvoltage when the circuit breaker is closed, a resistor closing method is generally used in power transmission systems of 500K or more, in which a resistor is closed before the main contact. .

In this case, a link mechanism mechanically connected to the main contact is generally used as the contact for opening and closing the closing resistor. or,
A breaker equipped with a closing resistor, especially an SF. The breaking performance of spray-type circuit breakers has recently improved significantly, and circuit breakers with a significantly reduced number of breaking points have appeared, and even in 500 kV systems, two-point breakers have even appeared.

On the other hand, the value of the closing resistor that suppresses the closing overvoltage is determined by the insulation coordination level of the power transmission system, the system voltage, the system surge impedance, and the length of the transmission line, and is not affected much by the short circuit capacity. . Therefore, even if the performance of the circuit breaker is improved as described above and the number of interruption points is greatly reduced, the closing resistor remains unchanged from the current state. However, the fact that the number of breaking points is greatly reduced means that the number of closing resistance switching contacts is also reduced accordingly, and the space for the breaker in which these are installed is reduced to 11]. Efficient body arrangement has become an important issue.

FIG. 1 shows an example of a conventional circuit breaker with closing resistance.

A conventional circuit breaker with a closing resistor has four breaker units, }2a+2b+2c+2d, connected in series inside a tank 1, and both ends of the breaker unit are led out to the outside via a gashing SalJb. 2**2 of the interrupted units
b and 2c*2d correspond to drive units 4a and 4bft, respectively. Therefore, when the number of breaking points is reduced as described above, the number of closing resistance contacts is reduced, but
The resistor is the same as the conventional one. Furthermore, as the rated voltage of the circuit breaker increases, the surge voltage also increases, making it necessary to increase the capacity of the resistor and increase the number of resistors than before. Therefore, the conventional structure has the disadvantage that resistors cannot be arranged efficiently.

[Purpose of the invention]

The present invention has been made in view of the above-mentioned circumstances, and its purpose is to efficiently replace the making resistor and the making resistor switching contact arranged in parallel with the breaking point when the number of breaking points decreases. The purpose is to provide an interrupter that can be placed in the

[Soul 0 alignment] In order to achieve the above object, the present invention arranges a resistor with its central axis offset from the central axis of the horizontally arranged resistance switching contacts and main contact breaker. .

[Implementation sequence of the invention]

The present invention will be explained below based on an embodiment shown in FIGS. 2 to 4. The breaker unit 2 includes a closing resistance contact 5 as a resistance switching contact and a main contact 6 as a main contact breaker. The closing resistance contact 5 is a fixed contact 1o having a Weig spring 9 within the gap 8 formed by the insulating cylinder 7.
A movable contact 13 is arranged which moves forward and backward by a drive mechanism 12 comprising a lever 11 and the like. The tip portion of the movable contact 13 is covered with a shield 16. Similarly, fixed contact 10
The end portion of is also covered with a shield 16.

In addition, the upper main contact point 6 is located in the shield part 17 in the Yukaku 1.
The fixed contact 18 provided at the fixed part and the puffer piston 19 mounted on the fixed part are moved! , a movable contact 21 provided on the fur seal 20 is arranged. The movable contact 2 is
It is moved forward and backward by a drive mechanism 23 composed of a lever 22 and the like, and has an insulating nozzle 24 at its tip. Also, the lever of the resistance closing contact 5. 11 and the lever 22 of the main contact 6 are mechanically connected by a shaft 25 serving as a connecting mechanism, and are configured to operate at the same angular velocity. Further, the making resistance contact 5 is supported and fixed horizontally on the tank 1 side and the main contact 6 side using an insulator, and the movable contact 13 is located at a position where the axes of the main contact 6 and the making resistance contact 5 are different from each other. For example,
The metal fittings 37 of the plurality of resistors 33 are supported and fixed by the insulator 36 from the tank 1 side at a position with a sufficient upper insulation distance.
electrically connected to.

Therefore, in the above-described configuration, when a closing command is applied to the drive units 4a+4b, the driving force is applied to the insulated operating rod 31.
is transmitted to the interrupter lever 23 via the interrupter 2a.
2d performs the closing operation, the rotational force is transmitted to the lever 11 of the closing contact 5 through the insulating shaft 25 connected to the rotating shaft of the lever 23, and the closing contact 5 starts the closing operation. At this time, the electrodes are arranged so that the closing time of the closing contact 50 is shorter than the closing time of the interruption part 6, so even if closing operations are started at the same time, the closing contact 5 closes first and the closing resistance The body 33 is first inserted in series into the power transmission system, and after being energized for a certain period of time, the breaker 6 is turned on.
The closing resistor 33 is short-circuited, and the closing operation is completed. However, the interrupting operation is performed through a process Wρ that is opposite to the above-mentioned closing operation. In this case, the fixed side contact 10 of the contact 5 is attached to the panel 9.
Because of this, it is not possible to follow the opening speed of the breaker part 6 and the closing contact movable contact 13, and the closing contact 5 opens before the breaker part 6, and the inter-electrode insulation recovers first. Current interruption is performed at the main interruption section 6. In a high-voltage, large-capacity interrupter, it is necessary to increase the number of resistors (330) and increase the capacity of the resistors in order to suppress the irradiation caused by such closing and interrupting operations. As mentioned above, since the axes of the main contact 6 and the resistance contact 5 are arranged at different positions, the extra space around the main contact 6 and the resistance contact 5 can be used, and a large number of resistors 33... can be installed. In addition, in a circuit breaker that is frequently turned on and off, heat is likely to be generated from the resistor 33, so if it is placed horizontally above the axis of the main contact 6 and the resistance contact 5, the heat dissipation effect will be improved. thermal deterioration is reduced.

Furthermore, since the plurality of resistors #-33 are not directly supported by the main contact 6 or resistance contact 5 but are supported by an insulator from the tank 1, vibrations caused by the movement of the movable parts of the main contact 6 and resistance contact 5 are directly absorbed. Therefore, the strength of the support for the resistor 33 can be lowered, and deterioration of the mechanical strength of the resistor 33 can be reduced.

〔Effect of the invention〕

-Mi7 As explained above, the present invention has been developed by rationally arranging resistors and reducing the size of circuit breakers when the circuit breaker is turned on. This has the effect of providing a high-voltage, large-capacity interrupter that can suppress overvoltage to below the system protection level.

[Brief explanation of the drawing]

Fig. 1 is a schematic block diagram showing a conventional breaker, Figs. 2 to 4 show an embodiment of the present invention, Fig. 2 is an internal block diagram of the breaker, and Fig. 3 is its internal structure. The perspective view and FIG. 4 are longitudinal cross-sectional views of the breaker. 1... Gas-tight tank, 33... Resistor, 5...
・Resistance switching contact, 6... Main contact breaker. =80 -81-

Claims (3)

[Claims] (1) A main contact breaker provided in the gas-tight tank, a resistor connected in parallel with the main contact breaker to suppress overvoltage when switching on and off the circuit breaker, and a current flowing through the resistor to switch on and off. In the device equipped with a resistance switching contact, the resistance switching contact and the main contact breaker are arranged almost horizontally, and the resistor is centered with respect to the central axis in the longitudinal direction of the resistance switching contact and the main contact breaker. A breaker characterized by being arranged with an offset axis. (2) The circuit breaker according to claim 1, wherein the resistor is attached to the inner wall of the gas-tight tank via an insulator. (3) The interrupter according to claim 1, wherein the center axis of the resistor is deviated upward from the center axis of the resistance switching contact and the main contact.