JPH087726A - Gas-blast breaker switch - Google Patents

Abstract

PURPOSE:To enhance the breaking performance by combining two different diameter cylinders and pistons, etc., forming two gas compression chambers, and varying the gas blowing amount between the first half and second half of the breaking period in which the opening operation takes place automatically with the motion of the movable contacting piece. CONSTITUTION:This gas-blast breaker switch comprises a stationary female contacting piece 1, a movable male contacting piece 2 contacting and separating to/from the inner surface of the stationary contacting piece 1 with the opening/closing operation, the first cylinder 3 installed at the foremost of the movable contacting piece 2 in consolidation with it, and a nozzle 6 which is installed at the foremost of the first cylinder 3 and whose foremost part makes slide contact with the stationary contacting piece 1. The arrangement further includes the second, bottom-equipped cylinder 7 which has a large diametric portion 8, is installed on the outside of the first cylinder 3 rigidly, and whose bottom surface on the base side is airtightly penetrated by the movable contacting piece 2 and the first cylinder 3. On the outside surface of the first cylinder 3, a piston 13 is rigidly installed which is in slide contact with the foremost inner surface of the second cylinder 7. A communication hole 15 for gas flowing is provided as penetrating on the base side of the first cylinder 3.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a high voltage puffer type gas switch, gas circuit breaker, etc., and more particularly to a gas switch for switching a capacitor current.

[0002]

2. Description of the Related Art Conventionally, a gas switchgear of this kind used in various condenser equipment includes a male contactor that contacts and separates from a female contactor, and a cylinder outside the movable contactor. The nozzle at the tip of this cylinder integrally forms a movable portion.

Then, the tip end of the movable contactor and the nozzle are slidably contacted with the fixed contactor by the opening operation from the closed state,
When the movable part moves to the base side and the tip of the movable contact is separated from the fixed contact, an arc is generated between the two contacts.

At this time, the gas space formed between the movable part and the fixed piston is compressed by the movement of the movable part, and the arc extinguishing arc is extinguished by the arc extinguishing gas from the nozzle tip by this compression. Then, the cutoff is performed.

[0005]

In the case of the conventional gas switchgear described above, the blowing amount of gas cannot be variably adjusted during the interruption period during which the opening operation is performed, and the arc is actually extinguished during the interruption period. It is possible to improve the breaking performance by blowing a large amount of gas in the first half to surely extinguish the arc and reducing the blowing amount of gas in the latter half of the breaking period to quickly separate the movable contact from the fixed contact. There is a problem that can not be done.

According to the present invention, the amount of gas sprayed in the first half and the latter half of the shutoff period is automatically changed in accordance with the movement of the movable contactor, a large amount of gas is sprayed on the arc in the first half of the shutoff period, and the gas is sprayed in the latter half of the shutoff period. The purpose of this is to reduce the amount of spraying of M to move the movable contact quickly and improve the breaking performance.

[0007]

In order to achieve the above-mentioned object, in the gas switchgear of the present invention, there is provided a female fixed contactor and a male contactor which is brought into contact with or separated from the inside of the fixed contactor by opening / closing operation. A movable contactor; a first cylinder integrally provided with the contactor outside the movable contactor; a nozzle provided at the tip of the first cylinder, the tip of which comes into sliding contact with the fixed contactor; A bottomed second body that is fixed to the outside of the base, has a bottom surface on the base side, a movable contactor, and a first cylinder that penetrates airtightly.
A cylinder, a large-diameter portion formed on the base side of the second cylinder and having an inner diameter larger than the tip-side inner diameter, and a piston integrally provided on the outer surface of the first cylinder and slidingly contacting the inner surface of the second cylinder on the tip side. , And a communication hole for gas flow, which is provided on the base side of the piston of the first cylinder.

[0008]

In the gas switchgear of the present invention having the above-described structure, the fixed contact, the movable contact, the first cylinder and the nozzle form the first gas compression chamber, and the first and second cylinders and The second gas compression chamber is formed by the piston, and the movable contact moves to the base side during the cutoff period in which the opening operation is performed, so that the first cylinder, the nozzle, and the piston move together with the movable contact.

Then, in the first half of the shut-off period when the piston slides in contact with the inner surface on the tip side of the second cylinder, both gas compression chambers are compressed together in the state of being communicated by the communication holes, and a large amount of this compression is obtained. The gas is blown through the nozzle to the arc generated between the fixed contact and the movable contact.

Next, in the latter half of the shut-off period when the piston moves to the large diameter portion on the base side of the second cylinder, the piston no longer slides on the inner surface of the second cylinder and the second gas compression chamber is opened. At this time, the first gas compression chamber is also opened via the communication hole.

Therefore, the amount of gas sprayed is reduced, the movable contact is quickly moved to the base side, and the movable contact is quickly separated from the fixed contact.

[0012]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment will be described with reference to FIGS. 1 and 2 show a gas switchgear, in which the reference numeral 1 denotes a female fixed contactor having a plurality of cylindrically arranged finger contact pieces at its tip, the base of which is a fixed conductor. It is connected to the.

Reference numeral 2 is a male movable contactor whose outer surface is brought into contact with and separated from the inside of each contact piece of the fixed contactor 1 by opening / closing operation, and its base is connected to the movable conductor.

Reference numeral 3 denotes a cylindrical first cylinder provided integrally with the movable contactor 2 on the outside of the movable contactor 2 via a disc-shaped support body 4, and a plurality of 5 are transparently provided on the support body 4. Vents,
6 is a nozzle provided at the tip of the first cylinder 3,
It is formed of a heat-resistant insulator such as Teflon, and its tip portion is located closer to the fixed contact 1 than the movable contact 2 and slidably contacts the fixed contact 1 so as to come in contact with and separate from the fixed contact 1.

Reference numeral 7 denotes a bottomed second cylinder that is fixed to the outside of the first cylinder 3, and has a large-diameter portion 8 having an inner diameter larger than the inner diameter on the tip side on the base side. Reference numeral 9 denotes a bottom surface portion of the second cylinder 7 on the base side, and the movable contactor 2 and the first cylinder 3 are hermetically penetrated through a seal body such as a piston ring, 10, 11, and 12.

Reference numeral 13 denotes a disk-shaped piston integrally provided on the outer surface of the tip end portion of the first cylinder 3, and its peripheral end surface is attached to the inner surface of the tip end portion of the second cylinder 7 via a seal body 14 such as a piston ring. Airtight sliding contact.

Reference numeral 15 denotes a plurality of communication holes for gas flow, which are provided on the base side of the support body 4 of the first cylinder 3 and have an opening diameter larger than the thickness of the bottom surface portion 9.

16 is a first gas compression chamber formed by the movable contact 2, the bottom surface 9 of the first cylinder 3 and the second cylinder 7 and the support 4, and 17 is the first and second cylinders 3, 7 and the piston. 13 is a second gas compression chamber formed by 13.

Then, by the opening operation from the closed state shown in FIG. 1, the movable contact 2, the first cylinder 3, the support 4,
The nozzle 6 and the movable portion 18 of the piston 13 move to the base side (left side in the drawing) of the fixed contactor 1 to the movable contactor 2.
When is separated, an arc is generated between the contacts 1 and 2.

At this time, the first and second gas compression chambers 16,
17 communicates with the communication hole 15, and the piston 1
3 moves in sliding contact with the inner surface on the tip side of the second cylinder 7, and the gas space formed by both gas compression chambers 16 and 17 is compressed in an airtight state.

Due to this compression, a large amount of the arc-extinguishing gas compressed in the gas compression chambers 16 and 17 is blown to the arc through the vent hole 5 and the nozzle 6.

By blowing a large amount of this gas, the arc is extinguished without fail in the first half of the interruption period and the interruption is performed.

Next, when the movement of the movable part further progresses and shifts to the latter half of the cutoff period, the nozzle 6 is separated from the fixed contact 1 as shown in FIG.
The gas space located in the large-diameter portion 8 of the cylinder 7 and formed by the first and second gas compression chambers 16 and 17 is an open space.

Therefore, in the latter half of the cutoff period, the gas is no longer compressed, and the amount of gas sprayed is reduced, while the movable part 18 moves faster, and the movable contactor 2 is moved as shown in FIG.
Immediately move away from the fixed contact 1 as shown in FIG.

FIG. 3 shows the relationship between the time and the position of the movable contact 2 during the interruption period. The solid line indicates that the second cylinder 7 does not have the large diameter portion 8 and the piston 13 moves through the second cylinder 7 during the interruption period.
And a broken line is a movement curve of this embodiment.

In the figure, "closed" indicates a closed state in which the contacts 1 and 2 are in contact, "open" indicates an open state in which the contacts 1 and 2 are separated, and t ₁ , t ₂ Indicates the first half of the interruption period and the second half of the interruption period.

Therefore, if this gas switchgear is used to open and close the condenser equipment, the following effects will be produced.

First, in a capacitor facility using this type of gas switchgear, in order to suppress an inrush current, a series reactor of about several% is usually connected in series to a load capacitor, and its equivalent circuit is shown in FIG. As shown in.

In the figure, e is a system power supply, S is a gas switchgear, L is a series reactor, and C is a load capacitor.

When the voltage (difference voltage) between the terminals of the gas switchgear S is v and its flowing current is i, the voltage v and the current i change as shown in FIG. 5 by the opening operation.

As is apparent from FIG. 5, when the arc is extinguished at tx and the current i is cut off to 0, the voltage v after tx is the high frequency transient recovery voltage i generated immediately after that. , And the combined voltage with the inter-pole recovery voltage b of the commercial frequency, which peaks 1/2 cycle after the interruption.

Then, in order to ensure the interruption, it is necessary to blow a sufficient amount of gas to withstand a sharp transient recovery voltage immediately after tx, and thereafter, an inter-electrode insulation recovery characteristic that exceeds the voltage rise characteristic is required.

Then, in the first half of the interruption period immediately after tx, a large amount of compressed gas is blown to the arc due to the compression of the gas spaces of the first and second gas compression chambers 16 and 17, and in the latter half of the interruption period. By opening the gas compression chambers 16 and 17, the movable contact 2 is immediately separated from the fixed contact 1, and sufficient interelectrode insulation recovery characteristics are secured.

Therefore, the gas compression force is not increased uniformly over the entire cutoff period, and the cutoff can be reliably performed, so that the cutoff performance is remarkably improved.

When the conventional apparatus is remodeled and formed, a cylinder corresponding to the second cylinder 7 may be added to the conventional apparatus and the second gas compression chamber 17 may be additionally formed. , The first and second gas compression chambers 16 and 17 are provided in the gas space of the conventional device by a cylinder corresponding to the first cylinder 3.
It may be formed by partitioning into.

[0036]

Since the present invention is configured as described above, it has the following effects. During the first half of the shutoff period when the piston 13 slides in contact with the inner surface of the second cylinder 7 by the opening operation and moves, the first and second gas compression chambers 16 and 17 are compressed together by the communication hole 15 in a communicating state. , A large amount of gas obtained by this compression is applied to the nozzle 6
The arc is blown to the arc generated between the fixed contact 1 and the movable contact 2, and the arc is surely extinguished.

Further, in the latter half of the interruption period in which the piston 13 moves to the large-diameter portion 8 on the base side of the second cylinder 7, the piston 13 no longer slides on the inner surface of the second cylinder 7.
The 2nd gas compression chamber 17 will be in an open state, the 1st gas compression chamber 16 will also be in an open state via the communicating hole 15 at this time, the amount of gas spraying will reduce, and the base part of the movable contactor 2 will become. The movement to the side is promptly performed, and the movable contact 2 is quickly separated from the fixed contact 1.

Therefore, the blowing amount of gas in the first half and the latter half of the breaking period can be automatically changed in accordance with the movement of the movable contactor 2, and the breaking performance can be remarkably improved.

[Brief description of drawings]

FIG. 1 is a cutaway front view of an embodiment of a gas switchgear of the present invention.

FIG. 2 is a cutaway front view of another state of FIG.

FIG. 3 is a movement characteristic diagram of the movable contactor of FIG. 1 during a breaking period.

4 is an equivalent circuit diagram of a capacitor facility using the gas switchgear of FIG.

5 is an explanatory diagram of operating characteristics of FIG. 4;

[Explanation of symbols]

 1 Fixed Contact 2 Movable Contact 3 First Cylinder 6 Nozzle 7 Second Cylinder 8 Large Diameter Part 9 Bottom Part 13 Piston 15 Communication Hole

Claims (1)

[Claims] 1. A female fixed contact, a male movable contact that is brought into contact with and separated from the inside of the fixed contact by an opening / closing operation, and an outside of the movable contact that is integrally provided with the contact. A first cylinder, a nozzle provided at the tip of the first cylinder, the tip of which is in sliding contact with the fixed contactor; and a bottom surface of the base fixed to the movable contactor that is fixed to the outside of the first cylinder. A second bottomed cylinder through which the first cylinder penetrates in an airtight manner; a large-diameter portion formed on the base side of the second cylinder and having an inner diameter larger than the tip-side inner diameter; and an integral outer surface of the first cylinder. A gas switchgear provided with a piston that is slidably in contact with the inner surface of the second cylinder on the front end side, and a communication hole for gas flow, which is transparently provided on the base side of the piston of the first cylinder.