JPH0282417A - Breaker - Google Patents

Abstract

PURPOSE:To maintain concentricity for keeping up a break and make function of both a stationary electrode section and a movable electrode section over a long period of time so as to permit the formation of a large-capacity and high-reliability breaker, by mounting plural capacitor units on a pair of electrode plates being electrically connected to a stationary electrode section and a movable electrode section for forming the breaker. CONSTITUTION:A breaker 1 is formed in such a manner as the step of receiving plural pieces of capacitor elements 12 multiply in hollow insulated rods 11 to connect them in series with one another to make capacitor units 15, arranging the required number of the capacitor units 15 electrically and mechanically in parallel with one another between paired electrode plates 16 to make capacitors 9A, 9B, and fixing these capacitors 9A, 9B electrically and mechanically between both the stationary electrode side and the movable electrode side of the breaker 1. Thus, large-capacity capacitors can be easily mounted onto the breaker 1 without causing any increase in the dimensions of a tank 2 for the breaker 1, and in mounting the capacitors thereonto, centering accuracy in a breaker electrode section is prevented from being lowered, with prolonged reliability on the capacitors themselves permitted to be maintained.

Description

[Detailed Description of the Invention] [Object of the Invention] (Industrial Application Field) The present invention relates to a mounting arrangement of a capacitor installed to suppress the rate of rise and peak value of a transient recovery voltage after current interruption of a circuit breaker. This is related to the improved cutoff 8:・).

(Prior art) Generally, this type of parallel capacitor is constructed in a bar shape, and is placed around the electric Jε interrupting part of the circuit breaker as close as possible to the contact part.
They were arranged in a basket shape. A capacitor with such an arrangement is compact as a whole and alleviates ground electric field stress. Good for a taste. However, a large breaking capacity will be required in the future.

As the capacitance of the capacitor is required to increase, the overall tank size tends to increase.

(Problem that the invention attempts to solve) When installing a parallel capacitor, add 1-several potions η.

Maintaining concentricity with fixed and movable parts that open and close, and preventing external mechanical forces from being applied to capacitors that are installed multiple times will be impaired. In other words, interruption 2: + is the function. 2. Since the concentricity of the fixed and movable parts must be given top priority, in capacitor units where the number of installed capacitors increases due to the increase in capacity, it is necessary to mechanically attach the capacitors to the cut-off part after they are installed due to the misalignment of the installation centers of each capacitor unit. The force remains in effect.

The mechanical force applied to this group of capacitors after installation will cause damage to the capacitors in the long run, or this force will cause the capacitors to become fixed and fixed.
There is a risk that the function of the gas circuit breaker may be affected, such as the concentricity of the movable movement being distorted.

The purpose of the present invention is to maintain concentricity for a long period of time to maintain the opening/closing functions of the fixed and movable parts of the circuit breaker, as the number of capacitors installed between the poles of the circuit breaker increases due to the increase in capacity. The objective is to provide a high-capacity, highly reliable circuit breaker that can be maintained for a long period of time.

[Structure of the invention]

(Means for Solving the Problems) The shutoff H:'i of the present invention is such that a relatively movable fixed electrode part and a movable electrode part are housed in a sealed tank filled with insulating gas, and the fixed electrode Department and possible! In a circuit breaker in which a capacitor assembly is installed electrically and mechanically in parallel between the i/IJ electrode section, the capacitor assembly is constructed by inserting multiple capacitor elements into a hollow insulating rod and mutually connecting them to each other. The capacitor units 1 to 1 are electrically connected in series, and the plurality of capacitor units are installed on a pair of electrode plates that are electrically connected to the fixed electrode part and the movable electrode part, respectively. This is a characteristic feature.

(Function) In the present invention, the assembly precision between the fixed electrode part and the movable electrode part of the interrupting part is maintained by the insulating cylinder. This assembly accuracy is maintained and fixed 'i'! ! By attaching a plurality of capacitor units and an installed capacitor electrode plate to the pole flange and the movable electrode flange, the capacitor assembly can be electrically and mechanically paralleled between the fixed electrode part and the movable electrode part. It will be installed. Mounting the capacitor assembly is easy.

(Embodiments) The present invention will be described below with reference to embodiments shown in FIGS. 1, 2, 3, and 4. First, Figures 1 and 2
In the figure, the circuit breaker 1 of the present invention has two circuit breakers 3A and 3B in a closed tank 2 sealed with insulating gas and an operating mechanism 4.
and supported by an insulating tube 8, and both quick cutting parts 3A, 3B
Output terminal 5A.

5B are exposed to the outside through bushings 6A and 6B, respectively, and both quick-opening portions 3A and 3B are configured to be opened and closed by vertical movement of an operating rod 7 extending from an operating mechanism 4.

In this type of circuit breaker 1 having a large breaking capacity, the breaking portions 3A and 3B have a transient recovery voltage of 1 - after cutting off the 'fl flow.
Capacitors 9A and 9B are used to suppress the rise rate and peak value.
is attached. The present invention is characterized by the configuration and mounting structure of the capacitors 9A and 9B. That is, capacitors 9A, 91. As shown in FIGS. 1 and 2, 'J' is sunk into both sides of the insulating cylinder 10A and IOB of each of the fast disconnection parts 3A and 3B.

Both capacitors 9A and 9B have the same configuration, and the third
As shown in the figure, a required number of capacitor elements 12 are housed in multiple layers inside a hollow insulating rod 11, and both ends of the insulating cylinder 11 are fixed with support fittings 13, and each capacitor element is 12, these capacitor cords 12 are electrically connected in series to form one capacitor unit 15, and the required number of capacitor units 15 are connected to the electrode plates 16.
16 and the supporting metal fitting 13 are tightened with bolts 17 to form an integral structure.

These capacitors 9A are attached by tightening and fixing the two types of electrode plates 16, 16 to the interrupting portions 3A, 313 as shown in FIG. That is, in FIG. 4, the interrupting section 3A includes a fixed main energizing section 19 having a fixed arc electrode 18 in the center, and a movable arc electrode 20 in the center.
and a movable main current-carrying part 22 having an insulating nozzle 21 around it, and these fixed main current-carrying part 19 and movable main current-carrying part 22 are surrounded by an insulating tube 10A of a cutoff part.

A movable rod 23 is connected to the base of the movable arc electrode 20, and a link 24 of the operating mechanism 4 is connected via the movable rod 23. Furthermore, a buffer cylinder 25 is formed on the outer peripheral edge of the movable main current-carrying part 22, and this buffer cylinder 25 moves in conjunction with the movement of the movable rod 23 to move the buffer chamber 26 formed in the movable side electrode member 27.
The insulating gas in the buffer chamber 26 is compressed and the insulating nozzle 21
to the arc generated between both arc electrodes 18.2o.

These fixed arc electrodes 18 and the fixed main current-carrying section 1
9, the movable arc electrode 20, and the movable main current-carrying part 22,
It is surrounded and insulated by an insulating tube 10A. The capacitor 9A according to the present invention is mechanically attached to the flange 28 of the fixed main current carrying part 19 and the flange 29 of the movable main current carrying part 22 by tightening the electrode plate 16.16 with bolts 30.30, and The capacitor 9A will be electrically connected in parallel between the fixed electrode and the movable electrode.

In the circuit breaker 1 of the present invention configured as described above, in order to assemble the capacitors 9A and 9B, multiple capacitor elements 12 and 12 are pressed with the spring 14 and placed in the hollow insulating rod 11 with contact pressure. Since it is housed, it has a capacitor function and a mechanical function by itself. A plurality of these are arranged in a wave train, and the electrode plate 16.16
By fixing both ends with
5 is unitized as a capacitor 9A, so
Capacitors 9A and 9B can be assembled regardless of the centering accuracy of interrupting parts 3A and 3B. Furthermore, when attaching capacitors 9A and 9B in parallel to the cut-off parts 3A and 3B, the centering accuracy of the fixed electrodes 18 and 19, the movable electrodes 20 and 22, and the insulating nozzle 21 of the cut-off parts 3A and 3B that have already been assembled is You can work without changing or adjusting.

〔Effect of the invention〕

As described above, in the present invention, a plurality of capacitors and triplets are multiplexed and connected in series in a hollow insulating rod to form a capacitor unit 1, and the required number of capacitor units 1- A capacitor is created by arranging a pair of plates (electrically and mechanically in parallel between four plates), and this capacitor is electrically and mechanically fixed between the fixed electrode side and the movable electrode side of the circuit breaker. With this configuration, a large capacity capacitor can be easily installed without increasing the tank size of the circuit breaker, and when installing the capacitor, it is possible to prevent a decrease in the centering accuracy of the circuit breaker electrode part. Furthermore, the long-term reliability of the capacitor itself can be maintained.

[Brief explanation of the drawing]

FIG. 1 is a sectional view showing one embodiment of the circuit breaker of the present invention, and FIG.
Figure 3 is a partially cutaway side view showing the capacitor used in the present invention, and Figure 4 is an enlarged view of the disconnection part of the present invention. FIG. 1... Circuit breaker 2... Sealed tank 3A, 3B
...Cutoff part 4...Operation mechanism part 9A, 9B Capacitor 1o...Insulation tube 11 Hollow cutoff Me 12
... Capacitor element 13 ... Supporting metal fittings 14
... Spring 15... Capacitor unit 16... Electrode plate 18... Fixed arc electrode 19... Fixed main current carrying part 20... Movable arc electrode 22... Movable main current carrying part 23.
・Movable rod 25...Buffer cylinder 26・
...Buffer chamber 27...Movable side electrode member Fig. 1 Fig. 2

Claims (1)

[Claims] A fixed electrode part and a movable electrode part that can move relative to each other are housed in a sealed tank filled with insulating gas, and a capacitor assembly is electrically and mechanically paralleled between the fixed electrode part and the movable electrode part. In the circuit breaker installed in the circuit breaker, the capacitor assembly includes a plurality of capacitor elements inserted multiple times into a hollow insulating rod and electrically connected in series to form a capacitor unit, and the plural capacitor units are connected to the fixed electrode section. and a circuit breaker, comprising a pair of electrode plates each electrically connected to a movable electrode portion.