JPS5842122A - Vacuum 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] The present invention relates to a protector tube mounted vacuum interrupter.

With the development of vacuum technology, in recent years medium voltage class circuit breakers have shifted to vacuum circuit breakers that utilize vacuum valves. The biggest advantage of vacuum valves is that they have good insulation properties, so they can be made much smaller, and the interrupter can also be made much smaller.

However, the biggest weakness is the vacuum container □
Since the contact is housed inside the container, the state of the contact being worn out can be managed only by the stroke of the contact spring when the contact is pressed further after contact on the outside, that is, the wipe dimension, and the vacuum failure inside the container can be managed. It is impossible.

Generally, the former strives to maintain performance through dimensional control during inspections, and the latter through withstand voltage tests. Therefore, in the unlikely event that there is an inspection error during inspection, or if the inspection is not done to fully heat up, the performance of the 111 flll inside the vacuum chamber will not be maintained and there is a risk of serious loss to the system.

The present invention addresses the above-mentioned drawbacks and automatically reduces the wear and tear of the contacts of the vacuum valve by 1! The purpose is to provide a vacuum interrupter equipped with a protective device that can be controlled on the island.

An embodiment of the present invention shown in the drawings will be described below. In Fig. 1, the fixed shaft (la) of the vacuum breaker vacuum valve +1) is fixed to the upper terminal (2), and the movable shaft (1b) is fixed to the upper terminal (2).
is connected to the lower terminal (3) K with a flexible conductor (3 m).

A connecting rod (4) directly connected to the movable shaft (1b) has a pin (6) attached to one end of a lever (5) rotatably pivoted approximately in the center.
A connecting member (8) connected to the other end of the lever (c) by a pin (7) is connected to the operating rod via a contact spring (9). Operation rod (1 (I is operation device a1)
Operation levers (connected to each other and biased in the opening direction by an opening spring I)

The contact ring α field is fixed to the end of the operating rod αQ that passes through the connecting member (8) via the insulating member 114 as shown in FIG. It is bent and held. The contact ring (to) takes out a lead wire, connects to a light emitting diode mounted in an easily visible place on the front of the interrupter, and connects to the power source (L7) as shown in the diagram W2B.

Next, the action will be explained. FIG. 1 shows the closed circuit state of the vacuum interrupter, in which the operating device 01) pushes the operating rod a with the operating lever 025 and connects the connecting member (8) via the contact spring (9).
is pushed up via the lever (5) to bring the movable shaft (xb) T into contact with the fixed shaft (la) K. 1 In this case contact ring CI! 9 is still in contact with the connecting member (7) and compresses the contact spring (9) by a dimension at from the 9 position to form the contact pressure of the vacuum valve (1), and the dimension G between it and the connecting member (7).

is smaller than dimension G.

vacuum,? If the contacts in the lubricant (1) wear out, the connecting rod (
4) moves upward and decreases in dimension Gti, finally becoming ()1
becomes zero, the connecting member (8) comes into contact with the contact ring (c) and is energized, and the light emitting diode αQ lights up as shown in Fig. 3.
It can be secured in front of the breaker.

When the operating device a1J is tripped, the operating lever α is pulled by the opening spring I and rotates in the counterclockwise direction, moves to the operating rod arm, pulls the connecting member (8), and moves the lever (5) clockwise. When the vacuum valve (1) rotates, the vacuum valve (1) opens. In this case, the connecting member (8) contacts the contact ring 4 and the light emitting diode lights up, but since it is in an open state, it can be distinguished from the former. In order to prevent the light emitting diode util from emitting light in an open state, for example, a normally closed contact of a breaker may be inserted into the circuit.

Figure 4 shows another example of using a light emitting diode (instead of IQ, input to the protection device) to issue an alarm, turn on the alarm light in the switchboard room, and immediately detect the wear of the circuit breaker contact. "As described above, according to the present invention, in the vacuum breaker, the vacuum valve tl!
A contact ring is attached via a connecting member to an operating rod that drives the closing lever in the closing direction via a contact spring, and when the contact ring contacts the lever, the protection device is activated and the light emitting diode is turned on. Since the alarm is activated, the wear and tear of the vacuum valve contacts can be automatically and easily managed, which has an excellent effect of improving reliability.

[Brief explanation of drawings]

The longitudinal cross-sectional view and the iris 3 are in contact with the main parts of Figure 1! Circuit diagram, 4th
The figure is a connection circuit diagram of main parts of another embodiment. (1)...Vacuum valve (5)--Lever (8)
...Connecting member (9)...No contact aO...
Operation lever α◆...Insulating member α...Contact ring (tQ...Light emitting diode aη...Power source
α碍・・・Protective device agent Patent attorney Inoue −
Male Figure 1 Figure 2 Figure 3 Figure 4

Claims (1)

[Claims] 1. A lever that opens and closes a vacuum valve, an operating rod that drives this lever in the opening direction via a contact spring, and an operating rod that is attached to this operating rod via an insulating member and that approaches and separates from the lever. A vacuum interrupter comprising a contact ring and an insulating device activated by contact of said lever with said contact ring. 2. The vacuum interrupter according to claim 1, wherein the protection device is a vacuum interrupter equipped with a light emitting diode. 8. The vacuum breaker according to claim 1, wherein the λ protection device is adapted to emit an alarm.