JPH11126545A - Gas-blast circuit-breaker - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a gas-blast circuit-breaker provided with an insulating operation rod with high insulating reliability even in a long time use. SOLUTION: In this gas-blast circuit-breaker, an insulating operation rod 10 is constituently provided with an insulator 30 constituted of a fiber containing aluminum oxide as a main component and epoxy resin reinforced by the fiber metal fittings 22, 25 to respectively hold both ends of the insulator 30 and connected to an arc-extinguishing chamber and an operation apparatus, respectively and the operation rod 10 connects an arc-extinguishing chamber and an operation apparatus which drives the arc-extinguishing chamber.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a gas circuit breaker used in the substation field of an electric power system, and more particularly to an insulating operating rod for driving an arc extinguishing chamber.

[0002]

2. Description of the Related Art FIG. 5 and FIG.
ol. 56, no. 9, September 1982, pages 44-48
It is sectional drawing which shows the conventional gas circuit breaker described on page "240 / 300kV one-point cut and 550kV two-point tank type gas circuit breaker", and sectional drawing which shows the insulating operation rod.
In FIG. 5, 1 is a gas circuit breaker filled with SF6 gas, 2 is a container of the gas circuit breaker 1 using SF6 gas, 3 is an isolated room stored in the container 2, and 4 is connected to the isolated room 3. 5 is a cooling cylinder, 6 is a closing resistance contact, 7 is a resistor, 8 is an insulating support, 9 is an insulating support cylinder, and 10 has one end connected to the isolation chamber 3 via a link mechanism 4. Insulated operating rod,
Reference numeral 11 denotes a drive mechanism connected to the other end of the insulating operation rod 10;
Reference numeral 2 denotes an operating device that is connected to the other end of the insulating operating rod 10 via a driving mechanism 11 and drives the isolation chamber 3, reference numeral 13 denotes a gas bushing, reference numeral 14 denotes an insulating spacer, and reference numeral 15 denotes a current transformer.

In FIG. 6, reference numeral 20 denotes an insulator of the insulating operation rod 10, which is made of epoxy resin reinforced with glass fiber or glass cloth. 21 is a coating part of the insulator 20, 22 is one metal fitting for supporting the insulator 20,
It is connected to the isolated room 3 via a link mechanism 4. 23 is a connection pin hole, 24 is a ventilation hole provided in the metal fitting 22, 25
Is the other metal fitting for supporting the insulator 20 and is connected to the operating device 12 via the drive mechanism 11. 26 is a metal fitting 25
, 27 is a connecting rod, 28 is a connecting rod 27
The connecting pin hole 29 is provided on the connecting rod 27 and the fitting 2.
5 is a fixing bracket for fixing 5. FIG. 7 is a diagram showing electrical characteristics of a conventional insulating operation rod.

Next, the operation will be described. In FIG. 5, the isolated room 3 of the gas circuit breaker 1
When the gas circuit breaker 1 is opened and closed, a load of several to several tens tons is applied to the insulating operation rod 10 when the gas circuit breaker 1 is opened and closed. Therefore, the insulating operation rod 10 needs to have high strength and high rigidity, and further have excellent insulating properties. In FIG. 6, the insulating operation rod 10 is formed by screwing metal fittings 22 and 25 to both ends of an insulator 20 made of epoxy resin reinforced with glass fiber or glass cloth. The insulator 20 made of an epoxy resin reinforced with glass fiber or glass cloth is manufactured by a vacuum casting method in order to improve insulation properties. This insulator 20
Reacts with SF4, HF, or the like, which is an active gas generated when the gas circuit breaker 1 opens and closes the current, since the surface has a glass portion, and the surface resistivity of the insulator 20 decreases as shown in FIG. Has problems. To prevent the surface resistivity of the insulator 20 from decreasing, a coating portion 21 is provided on the surface of the insulator 20.

FIG. 7 shows a comparison between when the coating portion 21 is provided and when it is not provided. The coating material of the coating portion 21 is an epoxy resin paint or a mixture of an epoxy resin and a filler such as hydrated alumina, and is applied after removing dissolved gas and moisture. As shown in FIG. 7, the surface resistivity of the insulator 20 having a coating is such that SF4 gas contains SF4 gas.
In the presence of an active gas such as, there is a tendency that it gradually decreases with time, and when the number of operation of the circuit breaker reaches about 10,000, there is a tendency to significantly decrease due to minute cracks on the coating surface. Even when the surface resistivity of the insulator 20 decreases, the insulation performance does not decrease because the electric field of the insulator 20 is determined by the capacitance distribution when a lightning surge or an AC voltage is applied, but the insulation distribution does not decrease when a DC voltage is applied. Since the electric field of the insulator 20 is determined, there is a problem that insulation performance is reduced.

[0006]

The insulating operation rod in the conventional gas circuit breaker is made of glass fiber reinforced epoxy resin coated with a coating material, and thus has a problem that the DC withstand voltage decreases when used for a long time. was there.

SUMMARY OF THE INVENTION The present invention has been made to solve the above problems, and has as its object to obtain a gas circuit breaker having an insulating operation rod having high insulation reliability even in long-term use.

[0008]

A gas circuit breaker according to the present invention holds an insulator made of an epoxy resin reinforced by a fiber containing aluminum oxide as a main component, and holds both ends of the insulator. An insulating operating rod having an arc-extinguishing chamber and a pair of holding members respectively connected to the operating device is provided. Further, the content of aluminum oxide contained in the fiber mainly containing aluminum oxide is set to 40% or more.

The fibers containing aluminum oxide as a main component are produced by spinning a solution containing an aluminum compound and firing at a high temperature. Further, an insulator made of an epoxy resin reinforced by fiber and a synthetic rubber-based coating material coating the surface of the epoxy resin, and both ends of the insulator are held, and the arc-extinguishing chamber and the operating device are provided. An insulating operating rod having a pair of holding members connected to each other is provided.

The synthetic rubber-based coating materials include urethane rubber, ethylene propylene rubber, ethylene propylene terpolymer rubber, fluorine rubber, chloroprene rubber,
One selected from nitrile rubber, butyl rubber and the like is used. In addition, the synthetic rubber-based coating material contains a pigment.

[0011]

BEST MODE FOR CARRYING OUT THE INVENTION

Embodiment 1 FIG. Hereinafter, Embodiment 1 of the present invention will be described. FIG. 1 is a sectional view showing a gas circuit breaker according to Embodiment 1 of the present invention. In FIG. 1, 1 to 12,
14 is the same as that in FIG. 5, and the description thereof is omitted. Reference numeral 16 denotes a conductor of the gas circuit breaker. FIG.
FIG. 2 is a cross-sectional view illustrating the insulating operation rod according to the first embodiment of the present invention. 2, 22 to 29 are the same as those in FIG. 6, and the description thereof will be omitted. Reference numeral 30 denotes an insulator made of an epoxy resin reinforced with a fiber or cloth mainly composed of aluminum oxide. FIG. 3 is a diagram showing electrical characteristics of the insulated operating rod according to Embodiment 1 of the present invention.

Next, the operation will be described. In FIG. 1, the isolated room 3 of the gas circuit breaker 1
When the gas circuit breaker 1 is opened and closed, a load of several to several tens tons is applied to the insulating operation rod 10 when the gas circuit breaker 1 is opened and closed. Therefore, the insulating operation rod 10 has high strength,
It is necessary to have high rigidity and to have excellent insulating properties. In FIG. 2, the insulating operation rod 10 is formed by screwing metal fittings 22 and 25 to both ends of an insulator 30 made of an epoxy resin reinforced with a fiber or cloth mainly composed of aluminum oxide.

The insulator 30 made of an epoxy resin reinforced with fibers or cloth mainly composed of aluminum oxide is manufactured by a vacuum casting method in order to improve the insulating properties. This insulator 30 does not react with the active gas SF4 or HF generated when the gas circuit breaker 1 opens or closes the current even if the aluminum oxide portion is exposed on the surface, and as shown in FIG. Has the characteristic that the surface resistivity does not decrease. Therefore, a coating material for preventing the surface resistivity of the insulator 30 from decreasing is not required.

As the fiber for reinforcing the epoxy resin constituting the insulator 30, pure alumina or aluminum oxide containing silicon oxide is used. When the content of silicon oxide exceeds 70%, the current switching of the gas circuit breaker 1 is performed. Under the influence of SF4 or HF, which is an active gas sometimes generated, the surface resistivity of the insulator 30 is reduced by 30% or more, and a coating for preventing this is required. Therefore, the insulator 30 composed of an epoxy resin reinforced with aluminum oxide-based fibers or cloth has a surface resistivity not reduced in SF6 when the aluminum oxide content is 40% or more, High insulation reliability can be maintained. Aluminum oxide-based fibers may contain some metal oxides other than silicon oxide.

In FIG. 2, the fiber or cloth mainly composed of aluminum oxide is more excellent in heat resistance than the conventional glass fiber, so that even if it is exposed to a high temperature gas at the time of current switching inside the gas circuit breaker. It also has the effect of being unaffected by strong light radiation. In FIG. 2, the fibers mainly composed of aluminum oxide are produced by spinning a solution containing an aluminum compound and firing at a high temperature of 1000 ° C. or more. Excellent and can be made into fiber or fabric economically. Although the aluminum oxide content of the aluminum oxide-based fiber varies depending on the production method, it is easy to produce economically when the content is 50 to 90%.

Further, in FIG. 2, the insulator 30 has a cylindrical shape, but the effect is the same whether the shape is a rod shape or a polygonal shape. Also, in FIG. 2, the metal fittings 22 and 25 are screw-connected to both ends of the insulator 30, but the same effect can be obtained by other taper bonding or adhesive bonding. Also,
In FIG. 1, the insulating operation rod 10 is disposed at a position away from the isolated room 3.
This is even more effective when it is arranged at a position that is more susceptible to the thermal effects during the switching of the current.

Embodiment 2 FIG. Hereinafter, a second embodiment of the present invention will be described. FIG. 4 is a sectional view showing an insulating operation rod according to Embodiment 2 of the present invention. In FIG. 4, 20, 22 to 29 are the same as those in FIG. Reference numeral 31 denotes a synthetic rubber-based coating portion that coats the surface of the insulator 20. The insulating operation rod according to the second embodiment is obtained by coating an insulator 20 made of an epoxy resin reinforced with glass fiber or glass cloth with a synthetic rubber-based coating material. FIG. 3 shows the electrical characteristics of the insulated operating rod according to the second embodiment in FIG.

Next, the operation will be described. In FIG. 4, the insulating operation rod 10 is formed by screwing metal fittings 22 and 25 to both ends of an insulator 20 made of epoxy resin reinforced with glass fiber or glass cloth. The insulator 20 is manufactured by a vacuum casting method in order to improve insulation properties. Since the insulator has a glass portion on its surface, it reacts with an active gas such as SF4 or HF generated when the gas circuit breaker 1 opens and closes the current, and as it is, as shown in FIG. However, there is a problem in that In order to prevent the surface resistivity of the insulator from decreasing, the surface of the insulator 20 is coated with a synthetic rubber-based coating 3.
1 is provided to prevent a decrease in the surface resistivity of the insulator as shown by a dotted line in FIG. As the coating material of the coating portion 31, one synthetic rubber having SF4 / HF resistance selected from urethane rubber, ethylene propylene rubber, ethylene propylene terpolymer rubber, fluorine rubber, chloroprene rubber, nitrile rubber, butyl rubber, and the like is used. It is applied after removing dissolved gas and moisture. Since these are flexible coating materials, cracks do not occur on the surface of the coating portion 31 even if they are operated many times, and a decrease in surface resistivity is prevented as shown in FIG.

The synthetic rubber-based coating material used for the insulating operation rod shown in FIG. 4 may contain a pigment in order to reduce the influence of strong radiation at the time of opening and closing the current. In the case of the insulated operation rod of FIG. 4, since low-cost glass fiber is applied and the cost of the synthetic rubber-based coating material is low, the insulated operation rod for a gas circuit breaker according to the first embodiment can be economically manufactured.

[0020]

Since the present invention is configured as described above, it has the following effects. An insulator made of an epoxy resin reinforced by a fiber mainly composed of aluminum oxide, and a pair of holding members respectively connected to the arc-extinguishing chamber and the operating device while holding both ends of the insulator. Since the operation rod is configured, it has excellent DC withstand voltage characteristics and can maintain insulation reliability for a long period of time. Further, since the content of aluminum oxide contained in the fiber containing aluminum oxide as a main component is 40% or more, the surface resistivity does not decrease for a long time.

Further, since the fiber containing aluminum oxide as a main component is produced by spinning a solution containing an aluminum compound and baking at a high temperature, a fiber having excellent flexibility can be produced economically. Further, an insulator made of an epoxy resin reinforced by fiber and a synthetic rubber-based coating material coating the surface of the epoxy resin, and both ends of the insulator are held, and the arc-extinguishing chamber and the operating device are provided. Since the insulating operation rod is constituted by the pair of holding members connected to each other, the insulating operating rod is excellent in DC withstand voltage characteristics, and can be manufactured economically while maintaining insulation reliability for a long time.

The synthetic rubber-based coating materials include urethane rubber, ethylene propylene rubber, ethylene propylene terpolymer rubber, fluorine rubber, chloroprene rubber,
One selected from nitrile rubber, butyl rubber and the like is used and has flexibility, so that no crack is generated. In addition, since the synthetic rubber-based coating material contains a pigment, the influence of radiation can be reduced.

[Brief description of the drawings]

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

FIG. 2 is a cross-sectional view illustrating the insulating operation rod according to the first embodiment of the present invention.

FIG. 3 is a diagram showing electrical characteristics of the insulated operating rod according to the first and second embodiments of the present invention.

FIG. 4 is a sectional view showing an insulating operating rod according to a second embodiment of the present invention.

FIG. 5 is a sectional view showing a conventional gas circuit breaker.

FIG. 6 is a sectional view showing a conventional insulating operation rod.

FIG. 7 is a diagram showing electrical characteristics of a conventional insulating operation rod.

[Explanation of symbols]

1 gas circuit breaker, 3 isolated room, 10 insulated operating rod,
12 Operating device, 20, 30 Insulator, 31 Coating part.

Claims (6)

[Claims] 1. A gas circuit breaker having an insulating operating rod connected between an arc-extinguishing chamber and an operating device for driving the arc-extinguishing chamber, wherein the insulating operating rod is reinforced by a fiber mainly composed of aluminum oxide. A gas circuit breaker, comprising: an insulator made of an epoxy resin formed as described above; and a pair of holding members that respectively hold both ends of the insulator and are connected to the arc-extinguishing chamber and the operating device. 2. The gas circuit breaker according to claim 1, wherein the content of aluminum oxide contained in the fiber containing aluminum oxide as a main component is 40% or more. 3. The gas circuit breaker according to claim 1, wherein the fiber containing aluminum oxide as a main component is produced by spinning a solution containing an aluminum compound and firing at a high temperature. 4. A gas circuit breaker having an insulating operating rod connected between an arc-extinguishing chamber and an operating device for driving the arc-extinguishing chamber, wherein the insulating operating rod is a fiber-reinforced epoxy resin and an epoxy resin. An insulator composed of a synthetic rubber-based coating material that coats the surface of the resin,
And a pair of holding members respectively holding both ends of the insulator and connected to the arc-extinguishing chamber and the operating device, respectively. 5. The synthetic rubber-based coating material is characterized in that one selected from urethane rubber, ethylene propylene rubber, ethylene propylene terpolymer rubber, fluorine rubber, chloroprene rubber, nitrile rubber, butyl rubber and the like is used. The gas circuit breaker according to claim 4. 6. The gas circuit breaker according to claim 4, wherein the synthetic rubber-based coating material contains a pigment.