JPH0382305A - Gas-insulated switchgear - Google Patents

Abstract

PURPOSE:To improve the reliability of an apparatus by forming the conductor side of a connecting conductor into a closed-end cylindrical part and by fixing a contact for electrically connecting with the conductor and a magnetic material for suppressing surge to the inner periphery of the cylindrical part. CONSTITUTION:After a magnetic material 7 and a contact 9 have been mounted on the inner periphery of the cylindrical part 8a of a connecting conductor 8, a conductor 3 is inserted between them, and the conductor 3 and connecting conductor are electrically connected via the contact 9. A surge overvoltage transmitted via the conductor 3 is suppressed by the inductance component of the magnetic material 7 arranged in the manner of going round the conductor 3. An insulating spacer 4 supports the conductor 3 in a ground metal case 1, and a conductor 4a is arranged, the connecting conductor 8 is fixed and the cylindrical part 8a for fitting the conductor 3 in the connecting conductor 8 is formed in the central part of the spacer.

Description

[Detailed Description of the Invention] [Object of the Invention] (Industrial Application Field) The present invention relates to gas insulated equipment, and in particular to stably suppress high frequency surges that occur when a gas insulated disconnect switch is operated. Gas insulated switchgear made possible by interrogation.

(Prior Art) Gas-insulated switchgears have been widely used in recent years as switchgears for high-voltage circuits used in substations. This gas-insulated switchgear is a highly stable, inert, non-combustible system that houses the bus bar, circuit breaker, new circuit switch, and other attached equipment in a grounded metal container. sex,
It is odorless and harmless, and is insulated and maintained with an insulating gas such as SF or gas, which has a dielectric strength 2 to 3 times that of air, and is used as a switching device for a high-voltage circuit.

Such devices generally have a coaxial structure, and surges generated within the device propagate with almost no attenuation. It is a well-known fact that high-frequency surges are generated in gas-insulated switchgear due to the operation of disconnectors and circuit breakers. Especially when operating the new circuit, the rising part of the wave crest is 3 to 5 ns,
A surge voltage may occur in which the maximum peak value of the subsequent high-frequency vibration of several MHz is more than twice the peak value of the constant operating voltage (2.0 pu or more). The steep wave crest of this surge caused an insulation breakdown accident in the oil-tei shing, and the peak value of the surge caused an arc between the poles of a disconnector that caused a grounding accident to occur in a grounded metal container. There have been reported cases of this happening. Furthermore, these surges are induced into the grounding system of the gas-insulated switchgear, causing various radio wave interference and destruction of low-voltage control circuits. Therefore, it is necessary to suppress the high frequency surge generated within the gas insulated switchgear by some means. The method shown in Figure 2 was proposed as a method of suppressing the high frequency surge that occurs when operating this disconnector (Japanese Patent Application Laid-Open No. 1983-1999).
No. 66510).

Figure 2 shows a partial cross-sectional view of a gas insulated switchgear, in which an insulating gas 2 is sealed in a grounded metal container l, and a conductor 3 is arranged, and this conductor 3 is sandwiched between the grounded metal container l. It is inserted into the connecting conductor 5 attached to the center of the insulating spacer 4 and is slidably supported.

A shield 6 is attached to one end of the connecting conductor 5 so as to surround the outer periphery of the conductor 3, and a magnetic material 7 fixed to the conductor 3 is disposed within the gap formed by the shield 6 and the conductor 3.

The large inductance component of the magnetic material 7 absorbs the resurge, thereby reducing the disconnector surge.

(Problem to be solved by the invention) However, because of the magnet fixed to the outer periphery of the conductor 3,
In the conventional configuration in which the connecting conductor 5 and the conductor 3 having the magnetic material 7 fixed to the outer periphery are slidably connected, excessive force is applied to the sliding part, resulting in high surface pressure, which may cause damage to the breaker's operation or Metal foreign objects or galling are likely to occur on the sliding surfaces during vibrating operations due to external excitation forces such as earthquakes, which poses a problem in terms of reliability.

SUMMARY OF THE INVENTION Therefore, an object of the present invention is to provide a highly reliable gas-insulated switchgear that effectively suppresses disconnector surges.

[Structure of the invention]

(Means for Solving the Problems) In order to achieve the above object, the present invention includes a metal grounding container filled with an insulating gas, an insulating spacer fixed to the metal grounding container, and a connecting conductor fixed to the insulating spacer. In a gas insulated switchgear comprising a conductor slidably supported by a conductor and a magnetic material disposed to surround the conductor,
The conductor side of the connecting conductor is formed into a bottomed cylindrical part, and a contact element that electrically connects to the conductor and a magnetic material that suppresses surge are fixed to the inner periphery of this cylindrical part. shall be.

(Function) Since the magnetic material is fixed to the inner periphery of the connecting conductor cylindrical portion, it is possible to prevent the weight of the magnetic material from acting on the conductor. Therefore, the conductor can be stably and slidably supported without galling or generation of metal foreign matter even when a disconnector or the like is opened/closed or subjected to vibrations due to an earthquake or the like.

(Example) An example of the present invention will be described below with reference to FIG.

Reference numeral 1 denotes a grounded metal container filled with insulating gas 2.

A conductor 3 is disposed within this grounded metal container 1 so as to be supported by an insulating spacer 4 . The insulating spacer 4 has a conductor 4a arranged at its center.

A connecting conductor 8 is fixed to this conductor 4a, and this connecting conductor 8 is formed with a bottomed cylindrical portion 8a to which the conductor 3 is attached. A magnetic material 7 and a contact 9 are attached to the inner periphery of the cylindrical portion 8a of the connecting conductor 8, and the contact 9 and the conductor 3 are electrically connected. The magnetic material 7 is formed into a substantially cylindrical shape, and is made of, for example, amorphous alloy powder solidified with an insulating resin such as epoxy resin.

Next, the effect will be explained. After the magnetic material 7 and the contact 9 are attached to the inner periphery of the cylindrical portion 8a of the connecting conductor 8, the conductor 3 is inserted, and the conductor 3 and the connecting conductor 8 are electrically connected via the contact 9. The surge-like overvoltage transmitted through the conductor 3 is suppressed by the inductance component of the magnetic material 7 disposed around the conductor 3.

Therefore, according to this embodiment, since the magnetic material 7 is attached to the highly rigid connecting conductor 8 to prevent the weight of the magnetic material 7 from acting on the conductor 3, the conductor 3 can be The contact state can be maintained, and even if the conductor 3 is vibrated and slides, galling or occurrence of metal foreign matter can be suppressed.

In the above embodiment, the conductor 4a of the insulating spacer 4 and the connecting conductor 8 are separate members, but it goes without saying that they may be an integral member.

〔Effect of the invention〕

As explained above, according to the present invention, it is possible to obtain a highly reliable gas insulated switchgear because the occurrence of galling or metal foreign matter is suppressed.

[Brief explanation of drawings]

FIG. 1 is a partial sectional view of a gas insulated switchgear according to an embodiment of the present invention, and FIG. 2 is a partial sectional view of a conventional gas insulated switchgear. 1...Metal grounding container 2...Insulating gas 3...
・Conductor 4...Insulating spacer 4a...
・Conductor 7... Magnetic material 8... Connection conductor 8a... Cylindrical part 9... Contact diagram diagram

Claims (1)

[Claims] A metal grounding container filled with an insulating gas, an insulating spacer fixed to the metal grounding container, a conductor slidably supported by a connecting conductor fixed to the insulating spacer, and a structure arranged to surround this conductor. In gas insulated switchgear equipped with a magnetic material, the conductor side of the connecting conductor is formed into a bottomed cylindrical part, and a contactor and a surge for electrical connection with the conductor are formed on the inner periphery of this cylindrical part. A gas insulated switchgear characterized in that a magnetic material to be suppressed is fixed.