JPH01304630A - Buffer type gas circuit breaker - Google Patents

Abstract

PURPOSE:To restrain a surge voltage upon closure of contact by composing a resistor contact of two point contacts capable of arbitrarily setting opening speed and a gap between the contacts interlocked with the movements of movable contact and the opposed contact. CONSTITUTION:When an opening force is exerted through an insulation rod 9, a movable contact 1 and a buffer cylinder 4 are moved rightwards while an opposed contact 2 is driven reversely. Contact elements 11b, 13b of a resistance contact B are driven while interlocked therewith. At this time, the elements 11b, 13b work in the contact B, and contact elements 11b, 13b pushed by spring tend to move with the elements 11b, 13b. Since gas in spaces C1, C2 of cylinder is compressed at that time, the elements 11d, 13d move with a slight delay after the movement of the elements 11b, 13b. The contact B is thus opened earlier than a breaking contact A. When the contact A is opened, gap 11, 13 are ensured. It is thus possible to generate arcs upon breaking at the contact A without the generation at the part B.

Description

DETAILED DESCRIPTION OF THE INVENTION [Object of the Invention] (Field of Industrial Application) The present invention relates to a puffer type gas circuit breaker used in a substation or a switchyard of a power system.

(Prior art) A puffer type gas circuit breaker creates compressed gas in the puffer chamber through the gas compression action of a puffer cylinder directly connected to a movable contact and a fixed puffer piston, and guides this gas to a nozzle to generate high-speed A gas flow is created and blown onto the arc to cool and extinguish the arc. Therefore, unlike a two-pressure type gas circuit breaker, there is no need to store high-pressure gas in advance or open and close a valve during spraying, resulting in a simple structure and excellent reliability. In addition, due to the self-blade pressurization effect caused by the arc, high spray pressure can be obtained, so the interrupting performance is also excellent. Due to these excellent characteristics, puffer type gas circuit breakers have become the mainstream of high voltage circuit breakers of 72 kV or higher.

The breaking performance per breaking point of such a puffer type gas circuit breaker has gradually improved in recent years due to technological advances and has reached 300 kV. In an attempt to further increase the breaking voltage per breaking point, a method as shown in FIG. 4 has been proposed. That is, this is a method in which the movable contactor is moved and at the same time the contactor (conventional fixed contactor) opposite the movable contactor is moved to increase the insulation voltage during the breaking operation.

In FIG. 4, reference numeral 1 denotes a movable contact section, which is composed of a movable arc contact 1a, a movable energizing contact 1b, and a nozzle 1c. This movable contact portion is fixed to the operating rod 3 together with the puffer cylinder 4 and driven. On the other hand, the opposing contactor section 2 includes an arc contactor 2a, an energizing contactor 2b, and a shield 2c. This opposing contact part is
It is directly connected to two insulating rods 15, and the insulating rods are further connected to a link mechanism section 6 that is connected to an operating rod.

With this mechanism, the opposing contact portion is driven in the opposite direction to the movable contact portion during the shutoff and closing operations.

Further, in FIG. 4, 16 is an insulating cylinder, which insulates and supports the movable contact portion and the opposing contact portion 2 in a container not shown in the figure, and 14 is a nozzle stand, in which a link mechanism portion 6 is attached.
is supported by the bottle 6a, and the puffer piston 5
is fixedly supported. Also.

7.8 is a slidable contact for drawing current from the opposing contact portion.

FIG. 4 shows the state in which the circuit breaker is closed. When an opening force is transmitted from an operating mechanism (not shown) to the puffer cylinder 4 and the movable contact portion 1 via the insulating rod 9, the movable contact portion 1 and the puffer cylinder 4 move in the direction of the arrow 17 on one side. , the opposing contact portion 2 is driven in the direction of the arrow 18.

Therefore, compressed gas is created within the puffer cylinder and is blown out from the nozzle 1b as a high-speed gas flow. As a result, the arc generated between the movable arc contactor and the arc contactor portion of the opposing contactor portion is cooled and extinguished. During this opening operation, as described above.

Since the opposing contact part is driven in the opposite direction to the movable contact part, the gap at the time of interruption becomes large, and high insulation performance can be obtained. This is the reason why the arc extinguishing chamber shown in FIG. 4 was proposed for high voltage applications.

(Problem to be Solved by the Invention) However, in high-voltage circuit breakers exceeding 300 kV, in order to suppress the high surge voltage at the time of closing, a resistance contact part is provided in parallel with the breaking contact part. It's normal. A double-motion puffer-type gas circuit breaker as shown in FIG. 4 requires a resistance contact section that is different from previous methods and is optimal for this method, which has not been devised so far.

It is an object of the present invention to provide a resistance contact portion with an optimal structure for such a double-motion puffer type gas circuit breaker, and to suppress surge voltage at the time of closing.

[Structure of the invention]

(Means for Solving the Problems) In order to solve the above problems, the present invention provides a resistance contact that moves in conjunction with the movable contact by a link connected to the movable contact portion. A resistance contact element that moves in conjunction with the opposed contact element by a link connected to the opposed contact element, and a resistance element connected in series thereto are provided in parallel with the cutoff contact element.

(Function) During the closing operation of the above double-motion puffer type gas circuit breaker, the parallel resistance contact section closes before the disconnection contact closes, so the amplitude of the surge voltage is suppressed by the resistance. . In the present invention, the resistance contact part is composed of two contacts that can arbitrarily increase the gap between the contacts, so the withstand voltage of the contact part can be increased, and it is well matched to a double-motion puffer type gas circuit breaker. .

(Example) The configuration of the present invention will be explained using an example shown in FIG. The breaking contact section A in FIG. 1, the link mechanism section 6, etc. have the same configuration as in FIG. 4. In FIG. 1, the movable contact portion 1 is
Arc contact 1a, nozzle Ic.

It is composed of a current-carrying contact 1b and a puffer cylinder.
It is also fixed to the operating rod. Further, the link mechanism section includes a lever 6b and joints 6c and 6d which are rotatably attached to the nozzle holder 14 with a pin 6a, and the joint 6c is connected to the operating rod 3 and rotates the lever 6b. Two insulating rods are attached to this link mechanism section, and an opposing contact section is connected to the end of the insulating rod on the opposite side of the link. This opposing contact portion includes an arc contact 2a, an energizing contact 2b, and a shield 2c. Furthermore, a movable sliding contact 7 is attached to the end of the facing contact portion 2, and a fixed contact 8 that is slidable thereon is provided. Reference numeral 16 denotes an insulating cylinder which insulates and supports the cutoff contact part A and the resistance contact part to be described later in the container.

Further, in FIG. 1, B is a resistance contact portion, which is connected and fixed in parallel to the cutoff contact portion. The resistance contact portion B is the contact portion 11. It is composed of a contact section 13 and a resistor section 12 connected in series.

In these elements of the resistance contact part, the contact part 11 is
Link 17a, joint 10a, lever 6b, contact 11b connected to the movable contact portion via joint 18a, contact lid that butts into contact with this, and spring 11e that pushes it.
, a cylinder 11c that accommodates the blade and the contact lid, and an insulating cylinder 11a that accommodates the entire body. Contact portion 13 is similarly configured. The contact 13b includes a joint 10b and a link 1 that are directly connected to the opposing contact portion.
7b, and is connected to the opposing contact portion via a joint 18b and driven. Further, like the contact portion 11, 13c is a cylinder, 13b is a contact, 13e is a spring, and 13a is an insulating cylinder.

A resistive portion 12 is provided between these two contact portions 11 and 13.
can be installed. This resistance section 12 includes a resistor 12b,
It is constituted by an insulating cylinder 12a that houses it.

The operation of this embodiment will be explained. FIG. 1 shows the state of the present invention during pole closing. When the opening force from the operating mechanism (not shown) acts on this via the insulating rod, as shown in Figure 2,
The movable contact portion and the puffer cylinder are driven in the direction of the arrow. On the other hand, the opposing contact portion is driven in the opposite direction.

In conjunction with these, the contacts 11b and 13b of the resistance contact portion B are also driven.

FIG. 2 shows two arc contacts 2a of the breaking contact part.

This shows the moment when la opens. At this time, in the resistance contact part, the contacts 11b and 13b move, and the contacts lid and 13d, which are pushed by the spring, move the contacts 11b and 13b.
I try to move with him. However, at this time, the gas in the cylinder spaces C1 and C2 is compressed, so the contact lid and the contact 13d are
and 13b, it does not move and moves slightly behind.

For this reason, these resistive contact portions open earlier than the opening of the cut-off contact portion. As shown in Figure 2.

Gaps 11 and 12 are already ensured when the interrupting contact portion opens.

Therefore, during the breaking operation, an arc is generated at the breaking contact portion and not at the resistance contact portion.

FIG. 3 shows the open state of the circuit breaker (arc extinguishing chamber) of the present invention. In this state, the resistance contacts lid and 13d have already moved to the stop position, and the resistance contact gaps 121, Q2
is made smaller than the gap Q of the breaking contact.

Further, in the state shown in FIG. 3, good insulation is maintained in both the cutoff contact and the resistance contact.

FIG. 4 shows the closing operation of the present invention. At this time.

As shown in the figure, the resistance contact portion is closed in a state where there is a gap ρ in the cutoff contact portion. Therefore, the surge voltage at the time of closing is suppressed by the resistor 12b and kept at a low value.

A feature of the present invention is that the contact portion of the resistance contact portion is composed of two points, and is driven by a link. By being configured with two points, a high withstand voltage can be obtained with a relatively small gap between each (compared to a configuration with one point). Further, by being driven by a link, the opening speed of the contacts and the gap between the contacts can be arbitrarily selected, so that the withstand voltage during the opening between the resistive contacts can be increased.

〔Effect of the invention〕

As described above, according to the present invention, the resistance contact part is interlocked with the movement of the movable contact part and the movement of the opposing contact part, and the opening speed and the distance between the contacts are Since it is composed of two contact portions with an arbitrary gap, it is easy to ensure withstand voltage performance between the resistance contacts. Therefore, 300k
It has become easier to manufacture high-pressure gas circuit breakers that can revolutionize V, and reliability has improved.

Manufacturing costs are also reduced.

[Brief explanation of the drawing]

FIG. 1 is a sectional view showing a closed state of the arc extinguishing chamber of a puffer type gas circuit breaker showing one embodiment of the present invention, and FIG. 2 is a sectional view showing the arc extinguishing chamber of the puffer type gas circuit breaker shown in FIG. FIG. 3 is a partial sectional view showing the very initial state, FIG. 1 is a partial sectional view showing the open state of the arc extinguishing chamber of the puffer type gas circuit breaker, and FIG. 4 is a partial sectional view of the puffer type gas circuit breaker prior to the present invention. It is a sectional view showing the closed state of the arc extinguishing chamber. 1... Movable contact portion, la... Movable arc contact, lb... Movable energizing contact, 1c... Nozzle, 2...
...Fixed contact part, 2a...Fixed arc contact. 2b...fixed current-carrying contact, 2c...shield. 3...Operating rod, 4...Puffer cylinder
15... Puffer piston, 6... Link mechanism section,
6a...Pin, 6b...Lever, 6c, 6d
...Joint, 7.8...Contact, 9...Insulating rod, 1
0a, 10b...Joint, 11...Contact part, lla
...Insulating tube, llb...contact. 11c...Cylinder, lid...Contact, lie
... Spring, 12... Resistance part, 12a... Insulating cylinder,
12b...Resistor. 13...Contact part, 13a...Insulating cylinder, 13b...
...Contact child. 13c...Cylinder, 13d...Contact, 13e
... Spring, 14 ... Nozzle stand, 15 ... Insulation rod, 16
a, 16b--insulating tube, 17a, 17b--link, 18a, 18b--joint. Agent Patent Attorney Noriyuki Chika Yudo Ken Daishimaru

Claims (1)

[Claims] A container filled with an arc-extinguishing gas such as SF_6 gas has a movable contact portion that can be moved in and out and a counter contact portion that faces the movable contact portion, and the movable contact portion has a puffer piston and a It has a mechanism that compresses gas with a puffer cylinder and guides the gas flow to an insulating nozzle part, and a link mechanism that is directly connected to a movable contact and an operating rod that drives it, and an insulating rod that is directly connected to the link. In the puffer-type gas circuit breaker, which drives the opposing contact portion by a link connected to the movable contact portion, a resistance contact that moves toward and away from the movable contact in conjunction with the movable contact, and the opposing contact. A link connected to the child part connects the resistive contact part to the breaking contact, which is made up of three elements: a resistive contact that connects and separates in conjunction with the opposing contact, and a resistive part connected between the two resistive contacts. A puffer type gas circuit breaker, characterized in that it is connected in parallel with a child part.