JPH0252372B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a gas circuit breaker, and particularly to the arrangement of a cylinder device in an operating mechanism for driving a movable contact of a gas circuit breaker.

In recent years, as the demand for electric power has increased, there has been a demand for circuit breakers with larger capacities and faster speeds in order to protect large current power transmission systems.

An example of the configuration of a conventional circuit breaker that meets such demands is shown in FIG. 1 of the accompanying drawings.
That is, in the figure, a conductor 2 is provided inside the bushing 1, and current is passed through the conductor 2, the fixed contact 4, and the movable contact 5. In addition to the fixed and movable contacts 4 and 5, a link mechanism 6 and an insulating operating rod 7 for driving the movable contact 5 are provided in the pressure vessel or tank 3 filled with arc-extinguishing insulating gas. Furthermore, a piston 8 which is operated by hydraulic pressure is installed outside the tank 3.
and a cylinder device 10 consisting of a cylinder 9, a valve mechanism 11 that switches the pressure oil path supplied to and discharged from the cylinder device 10, an oil tank 12 for storing hydraulic oil of the cylinder device 10, an oil pump 13 for pressurization, and a pressure oil storage. An accumulator 14 and the like are provided, and these constitute an operating mechanism.

Since the conventional device is constructed in this manner, the movable contact 5 is driven by the operation of the piston 8 of the cylinder device 10 via the link mechanism 6 and the insulated operating rod 7. The operation of the piston 8 is maintained at high pressure at all times because the cylinder chamber 9a on the left side of the piston 8 is always in communication with the accumulator 14. The valve mechanism 11 allows high pressure oil from the accumulator 14 or the oil tank 12
By switching from time to time to low pressure oil, the pressure is set to high or low, thereby actuating the piston 8 and, in turn, actuating the movable contact 5.
Note that the valve holder 11 is operated by an electromagnet (not shown) in response to an on signal and an off signal.

Furthermore, in the figure, the shaded areas in the cylinder chamber and oil piping indicate high-pressure oil, and the dotted areas indicate low-pressure oil.

Since the conventional device is configured and operates in this way,
Due to the large mass of the insulated operating rod 7, it is difficult to operate the movable contact 5 at a sufficiently high speed during operation, and in order to operate at high speed, it is necessary to increase the driving force of the piston 8. can be,
If it is increased in this way, a large load will be placed on the insulation operation rod 7, and for this reason, the insulation operation rod 7 must be
As a result, the insulated operating rod 7 becomes heavier. In addition, the insulated operating rod 7 has elasticity, and even when the piston 8 is operated at high speed, the insulated operating rod 7 stretches and the movable contact 5 itself does not operate at high speed. .

SUMMARY OF THE INVENTION An object of the present invention is to provide a gas circuit breaker that eliminates the drawbacks of conventional devices as described above and enables high-speed shutoff.

In order to achieve this object, the invention is characterized in that the cylinder device is provided within the pressure vessel and in the same pressure chamber, thereby omitting the insulated operating rod.

Hereinafter, the present invention will be explained based on the accompanying drawing, FIG. 2, showing a first embodiment thereof.

In the figure, a conductor 2, a fixed contact 4, a movable contact 5, a link mechanism 6, a piston 8, a cylinder 9,
cylinder device 10, valve mechanism 11, oil tank 12,
The oil pump 13 and the accumulator 14 are both similar to those in the conventional device, but
In the present invention, the cylinder device 10 is housed in a pressure vessel, such as a tank 21, filled with an arc-extinguishing insulating gas, and its axis is approximately perpendicular to the operating axis of the movable contact 5. It is arranged so that Note that the oil piping between the cylinder device 10 and the operating mechanism outside the tank 21 is made of a cast insulator (not shown), so the cylinder device 10 and the tank 21 are insulated.
Further, the movable contactor 5, the link mechanism 6, and the cylinder device 10 are insulated from the tank 21 and supported by an insulator (not shown). Note that the oil tank 12 and the valve mechanism 11 are provided above the cylinder device 10 to facilitate supply of hydraulic oil into the cylinder device 10.

Since the device of the present invention is configured in this way, its basic operating principle is almost the same as that of the conventional device, but the movable contact 5 is directly connected to the piston 8 of the cylinder device 10 via the link mechanism 6.
is connected to and driven.

Therefore, in the first embodiment shown in FIG. 2, since there is no insulated operating rod, the mass of the movable parts such as the movable contact 5 is reduced, and as a result, the movable contact 5 is moved by the small cylinder device 10. In addition, since there are few elastic members between the movable contact 5 and the piston 8, the movable contact 5
Since the gas circuit breaker can be directly driven, a high-speed gas circuit breaker can be obtained.

Next, a second embodiment of the present invention shown in FIG. 3 of the accompanying drawings will be described.

The cylinder device 31 of this embodiment accommodates two pistons 34 in the cylinder 33 that face each other and have piston rods 32 protruding from both ends of the cylinder 33, and a cylinder chamber 33a between the pistons has a low or high pressure. A cylinder device configured to supply high pressure oil to the cylinder chamber 33b outside the piston 34, similar to the first embodiment,
The cylinder device 31 is housed in a pressure vessel, for example, a tank 35, and the movable contact 5 is directly connected to the piston rod 32, and the axis of the cylinder device 31 is approximately the same as the operating axis of the movable contact 5. It is arranged as it appears in the mind. Further, the movable contactor 5 and the cylinder device 31 are supported by an unillustrated object, and the cylinder device 31 and the tank 3
The oil piping between the operating devices other than 5 is constructed of cast insulation. It should be noted that there is no problem in terms of operation even if this supporting insulator and the oil piping are used together. Note that the valve mechanism 11, oil tank 12, oil pump 13, and accumulator 14 are all the same as those in the first embodiment.

Since this embodiment is configured as described above, by sending high pressure oil or low pressure oil to the cylinder chamber 33a between the two pistons 34 to make the cylinder chamber 33a high or low pressure, the two pistons 34, That is, the movable contacts 5 are driven in opposite directions, that is, simultaneously outward or inward. Further, the cylinder device 31 is located above the oil tank 12 and the valve mechanism 11, and even if oil is supplied from the oil tank 12, oil does not enter the cylinder device 31.
When refueling the cylinder device 31, for example, valves 36 and 3 are installed in the piping between the cylinder chamber 33a of the cylinder device 31 and the oil tank 12 and other piping positions shown in the figure.
7, 38, 39, 40, a vacuum pump 41, a refueling tank 42, and valves 36, 37, 3.
8 is closed, valves 39 and 40 are opened, and the gas in the cylinder 33 and piping is evacuated by the operation of the vacuum pump 41. Thereafter, the valve 39 is closed, and the valve 38 is opened.
By opening it, oil can be supplied from the oil supply tank 42 to the cylinder 33 and piping. In normal operating conditions, valves 39, 38, and 40 are all closed, and valves 36 and 37 are open.

Since the second embodiment is configured as described above, the link mechanism 6 installed in the first embodiment and the isolation operation rod 7 in the conventional device are also omitted, so that the shutoff speed of the present embodiment is reduced. This has the effect of obtaining higher speed than that of the first embodiment.

As described above, according to the present invention, the mass of the movable part is reduced, and the elastic member between the piston 8 or 34 and the movable contact 5 is reduced or eliminated, resulting in a higher speed. The movable contactor operates at 1.5 cycles or 1 cycle, making it possible to obtain a high-speed gas circuit breaker.In addition, if the arc extinguishing chamber is a buffer-type arc extinguishing chamber, the arc extinguishing performance will be lower than the operation speed. Therefore, increasing the speed also has the effect of further improving the interrupting performance.

It should be noted that the reason why it has become possible to house a hydraulic cylinder device in a pressure vessel in this way is due to the miniaturization and increase in output of the hydraulic operating mechanism, as well as oil sealing technology and piping made of cast insulation material. Applications include high-pressure oil piping due to improved mechanical strength.

Further, in both of the above embodiments, a gas circuit breaker having two movable contacts has been described, but a gas circuit breaker with one arc extinguishing chamber and one movable contact may also be used. Further, a gas circuit breaker having two or more of these can be constructed in the same manner, and the same effect can be achieved. Furthermore, although we have described an operation mechanism for driving a movable contact that uses hydraulic oil as its working fluid, it is not limited to hydraulic oil; any incompressible fluid can be used as the working fluid. In this case, the same effects as in the above embodiment can be achieved.

[Brief explanation of drawings]

Figure 1 is a schematic vertical cross-sectional view of an example of a gas circuit breaker using a conventional hydraulic operating mechanism, Figures 2 and 3
The figure is a schematic longitudinal cross-sectional view of the first and second embodiments of the gas circuit breaker according to the present invention. 2... Conductor, 3, 21, 35... Pressure vessel (tank), 4... Fixed contact, 5... Movable contact,
6...Link mechanism, 7...Isolation operation rod, 8,
34... Piston, 9, 33... Cylinder, 1
0, 31...Cylinder device, 11...Valve mechanism, 1
2...oil tank, 13...oil pump, 14...accumulator, 32...piston rod. Further, in the figure, hatched areas in the cylinder chambers 9a, 9b, 33a, 33b and piping indicate high pressure oil areas, and dotted areas indicate low pressure oil areas. In each figure, the same reference numerals indicate the same or equivalent parts.

Claims (1)

[Claims] 1 At least one pair of relatively separable fixed contact and movable contact provided in a pressure vessel filled with arc-extinguishing insulating gas, and an incompressible fluid that drives the movable contact by a piston rod. a gas circuit breaker comprising an operation mechanism having a cylinder device using as a working medium, the cylinder device is housed in the pressure vessel, and the piston rod of the cylinder device is directly connected to the movable contact; A gas circuit breaker characterized by being directly connected via a link mechanism.