JPH04341718A - Gas breaker - Google Patents

Abstract

PURPOSE:To provide a thermobuffer type gas breaker having gentle electric field concentration, able to easily give a sufficient insulation distance while being made to surely obtain suppression of restriking voltage and a surge- resisting voltage performance due to presence of a capacitor. CONSTITUTION:A disconnector part for a capacitor circuit having an end part of a capacitor 6 formed in a rod shape as a fixed contact 7 while having an end part on the movable side of a terning lever 12 operating a movable contact shoe 2 of a breaker as a movable contact 8 is provided. Since the terminal part on the movable side of the turning lever 12 operating the movable contact shoe of the breaker largely changes its position in a closed pole state and an open pole state of the breaker, a large insulation distance can be given when the disconnector part of the capacitor 6 is in an open pole state while sufficiently softening concentration of an electric field.

Description

[Detailed description of the invention]

0001

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a thermal puffer type gas circuit breaker having a capacitor for suppressing re-electromotive voltage in parallel between contact poles of a disconnection section.

0002

[Prior Art] Conventionally, gas circuit breakers using FS6 (sulfur hexafluoride) gas, etc. have been widely used, but in this gas circuit breaker, a capacitor is connected in parallel between the poles. This was generally used to suppress the re-electromotive voltage, but in addition,
In the technique described in Japanese Patent No. 9715, the capacitor is disconnected from the electrical circuit after the circuit breaker completes its breaking operation, thereby suppressing the re-electromotive voltage and improving surge voltage resistance.

0003

[Problems to be Solved by the Invention] In the above-mentioned prior art, sufficient consideration has not been given to the configuration of the disconnecting section for disconnecting the capacitor, resulting in an increase in electric field stress on the insulating member due to electric field concentration and an increase in the insulation distance. There was a problem with securing it.

[0004] According to the present invention, electric field concentration is gentle, a sufficient insulation distance can be easily provided, and by having a capacitor, it is possible to surely suppress re-electromotive voltage and improve surge voltage resistance performance. The purpose of this invention is to provide a heat puffer type gas circuit breaker.

[0005]

[Means for Solving the Problems] The above object is to provide a disconnecting section in which the end of the capacitor is a fixed contact and the movable end of a rotary lever that operates a movable contact of a circuit breaker is a movable contact. This is achieved by

[0006]

[Operation] The movable end of the rotary lever that operates the movable contact of the circuit breaker changes greatly between the closed and open states of the circuit breaker, so the disconnecting section of the capacitor is opened. It is possible to provide a large insulation distance when the electric field is closed, and it is also possible to sufficiently alleviate the concentration of electric fields.

[0007]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The gas circuit breaker according to the present invention will be explained in detail below with reference to the illustrated embodiments. FIG. 1 shows an embodiment of the present invention, in which 1 is a sealed container (gas container), 2 is a movable contact, 3 is a fixed contact, 4 is an insulating nozzle, 5 is a thermal puffer chamber, 6 is a capacitor, and 7 is a fixed Contact, 8 is a movable contact, 9 is a flexible conductor, 10 is a rotating lever, 11a, 11b
12 is an external extraction terminal, 12 is an operating shaft, 13a and 13b are insulating spacers, 14 is a spring, 15 is a mounting member, and 16 is a terminal fitting.

The sealed container 1 serves as a sealed container for FS6 (sulfur hexafluoride) gas, and also includes insulating spacers 13a and 13b.
Together with this, they form the casing of the circuit breaker. Movable contact 2
and the fixed contact 3 constitute a breaking part of the circuit breaker, the movable contact 2 is electrically connected to the external lead terminal 11a in a slidable state, and the fixed contact 3 is connected to the external lead terminal 11a.
b is electrically connected as is. The insulating nozzle 4 accommodates the fixed contact 3 therein and serves to define a thermal puffer chamber 5 . The capacitor 6 is made up of a plurality of short cylindrical unit capacitors stacked together and has a spring 14.
It is assembled into a rod shape by pressing with is arranged between the insulating spacers 13a and 13b, and its end on the fixed contact 3 side is connected to the mounting bracket 15.
The fixed contact 3 is electrically connected to the external lead terminal 11b, and the end on the movable contact 2 side is connected to the terminal fitting 1.
It is electrically connected to the fixed contact 7 by 6.

The fixed contact 7 is the movable contact 2 of the capacitor 6.
It is located at the side end and is attached to the outside of the insulating spacer 13a while being electrically connected thereto. The movable contact 8 is attached to the movable end of the rotating lever 10 on the opposite side to the operating shaft 12, and is electrically connected to the external lead terminal 11a by the flexible conductor 9, and then connected to the operating shaft 12 of the rotating lever 10. Due to the rotational movement of 7, thereby functioning as a disconnecting section that connects and disconnects the capacitor 6 in parallel to the interrupting section of the circuit breaker consisting of the movable contact 2 and the fixed contact 3. By rotating the operating shaft 13, the rotating lever 10 opens and closes the disconnecting section consisting of the fixed contact 7 and the movable contact 8 as described above, and also moves the movable contact 2 of the disconnecting section.
It has the function of opening and closing the circuit breaker by moving it from a position away from the illustrated fixed contact 3 to a position engaged with it, or conversely, from a position engaged with the fixed contact 3 to a distant position illustrated. do.

FIG. 2 is a sectional view taken from the direction of the arrow II in FIG. It is shown that there is.

FIG. 3 shows details of the disconnection section consisting of the fixed contact 7 and the movable contact 8, and shows the state seen from above in FIG. As is clear from this figure, the fixed contact 7 is composed of two contact members 7a and 7b made of elastic metal plates, and these contact members 7a and 7
The movable contact 8 inserts between the contact members 7a and 7b and engages while sliding to obtain a closing operation.
w is provided.

Next, the operation of this embodiment will be explained. 1 and 3 show a state in which this gas circuit breaker is open, and in this state, since the movable contact 8 is separated from the fixed contact 7, it is natural that the capacitor 6
is separated from the breaking section of the circuit breaker consisting of the movable contact 2 and the fixed contact 3.

Next, the operating shaft 1 is operated manually by an actuator (not shown) or by operating the handle.
2 is rotated clockwise in the figure, this results in
The movable contact 2 is moved to the right in the figure via the connecting fitting 2a, and eventually engages with the fixed contact 3, and when it is inserted to a predetermined position, it is stopped, and the circuit breaker is brought into a closed state. In addition, along with this operation, the rotating contact 8 also engages with the fixed contact 7, so that the capacitor 6 is connected in parallel to the interrupting part of the circuit breaker consisting of the movable contact 2 and the fixed contact 3. become. At this time, as is clear from FIG. 3, the movable contact 8 is inserted between the contact members 7a and 7b of the fixed contact 7 over a sliding length Lw.

Next, the shutoff operation will be explained. When the operation shaft 12 starts to move counterclockwise in the figure from the closed state of the circuit breaker described above, the movable contact 2 first disengages from the fixed contact 3, and the energy of the arc generated thereby. The presence of the thermal puffer chamber 5 formed by the insulating nozzle 4 effectively suppresses arcing, resulting in a strong breaking action, and as the movable contact 2 moves away from the fixed contact 3, The arc is effectively extinguished, the electric path is interrupted, and the movable contact 2 is finally moved to the position shown in FIG. 1, settling into an open state.

On the other hand, in this process, the movable contact 8 is also eventually separated from the fixed contact 7 as shown in the figure, but in the process of breaking the electric circuit, the sliding length Lw shown in FIG.
Due to the presence of the movable contact 8, after the movable contact 2 is disengaged from the fixed contact 3, the movable contact 8 is prevented from disengaging from the fixed contact 7 until the electric circuit is cut off by the above-mentioned arc extinguishing. The dimensions of each part are determined, and as a result, when the movable contact 2 is opened, the opening operation of the disconnection section of the capacitor 6 by the movable contact 8 is faster than the opening operation of the movable contact 2. After a time delay, after the circuit has been cut off by the cutoff unit consisting of the movable contact 2 and the fixed contact 3, the capacitor 6 is connected in parallel to the movable contact 2 and the fixed contact 3 for a predetermined period of time, and then , the disconnection section consisting of the fixed contact 7 and the movable contact 8 is brought into an open state. Therefore, according to this embodiment, when a large current such as an accident current is interrupted, the heat puffer chamber 5 is disconnected. Not only can reliable circuit interruption be obtained due to the gas spraying effect, but also reliable circuit interruption can be obtained due to the re-electromotive voltage suppressing effect of the parallel capacitor 6 when interrupting a small current such as a circuit charging current. It is possible to obtain a gas circuit breaker that always has sufficient reliability from large currents to small currents while making full use of the advantage of the thermal puffer type gas circuit breaker that only a small operating force is required.

According to this embodiment, the fixed contact 7
Since it is possible to provide a separation distance between the contact point 8 and the movable contact 8 that is equal to or greater than the separation distance at the breaking section consisting of the movable contact 2 and the fixed contact 3, the electrical circuit of the capacitor 6 in the open state is It is possible to completely isolate the system from the system, and it is possible to reliably suppress the risk of adversely affecting equipment such as instrument transformers existing in the same system, or causing undesirable resonance phenomena.

At this time, the fixed contact 7 and the movable contact 8
Since a large insulation distance can be obtained between the capacitor 6 and the capacitor 6, the electric field stress applied to the capacitor 6 can be sufficiently reduced. This makes it possible to visually check the state of the circuit breaker, which greatly improves work safety.

Next, FIG. 4 shows another embodiment of the present invention.
The major point in which this embodiment differs from the embodiment shown in FIG. 15 in a cantilevered state, and a fixed contact 7 is provided at the end thereof, and a rotating lever 10 is also provided in the sealed container 1, and is configured to move the movable contact 2 by a connecting pin 2b. . Note that other configurations and operations are the same as those in the embodiment shown in FIG. 1, so detailed explanations will be omitted.

In the embodiment shown in FIG. 4, since the disconnection section of the capacitor 6 consisting of the fixed contact 7 and the movable contact 8 is housed in the sealed container 1, no effect can be expected from visually checking the operation. Since the entire structure is gas insulated, it can be expected to be advantageous in terms of ensuring insulation distance.

FIG. 5 shows still another embodiment of the present invention, in which a plurality of capacitors 6 in the embodiment of FIG. 1 or FIG.
Terminal 17 is provided at the intermediate connection point of , and lead wire 18 is connected from here.
It is designed such that it can be drawn out and connected to the voltage detection circuit 19. This voltage detection circuit 19 is further provided with another capacitor, and this capacitor and the capacitor 6 in the circuit breaker constitute a voltage division circuit, and the voltage (main voltage) of the electrical circuit in which the circuit breaker is installed can be measured and monitored as a voltage V without an instrument transformer. Therefore, this embodiment has the advantage that a capacitor-type PT can be obtained without using a separate high-voltage capacitor.

[0021]

[Effects of the Invention] According to the present invention, since the capacitor is connected in parallel between the contactors of the disconnection part only in the transient state of the disconnection operation, the arc extinguishing function relies only on the gas blowing action of the heat puffer chamber. In self-extinguishing gas circuit breakers, it is now possible to operate stably in the small current range, where the breaking performance was unstable, and the insulation distance can be easily secured, sufficiently suppressing the electric field stress on the capacitor. As a result, the advantage of the thermal puffer type gas circuit breaker, which requires less operating force, can be fully utilized.

[Brief explanation of drawings]

FIG. 1 is a front sectional view showing an embodiment of a gas circuit breaker according to the present invention.

FIG. 2 is a cross-sectional view of one embodiment of the present invention.

FIG. 3 is a detailed explanatory diagram of a contact portion in an embodiment of the present invention.

FIG. 4 is a front sectional view showing another embodiment of the present invention.

FIG. 5 is a circuit diagram showing still another embodiment of the present invention.

[Explanation of symbols]

1 Sealed container 2 Movable contact 3 Fixed contact 4 Insulated nozzle 5 Heat puffer room 6 Capacitor 7 Fixed contact 8 Movable contact 9 Flexible conductor 10 Rotating lever 11a, 11b External extraction terminal 12 Operation axis 13a, 13b Insulating spacer 14 Spring 15 Mounting parts 16 Terminal fittings

Claims (4)

[Claims] 1. A gas circuit breaker equipped with a capacitor arranged in a bar shape parallel to the moving direction of a movable contact with respect to a fixed contact of a thermal puffer type interrupter, the capacitor being located on the movable contact side of the capacitor. 1. A gas circuit breaker, characterized in that a disconnecting section is provided, with an extended portion of the end serving as a fixed contact, and an end on the movable side of a rotary lever that operates the movable contact serving as a movable contact. 2. In the invention according to claim 1, the fixed contact and the movable contact are configured to have a predetermined wipe distance, and when the movable contact is opened, the disconnection portion is opened by the movable contact. A gas circuit breaker characterized in that the pole operation is configured to be delayed by a predetermined period of time than the pole opening operation of the movable contact. 3. The gas circuit breaker according to claim 1, wherein the disconnection section is located outside a gas container of the circuit breaker. 4. The gas circuit breaker according to claim 1, wherein a terminal for connecting an external lead wire is provided on the fixed contact side of the capacitor.