JPH0743985B2 - Puffer type gas pipe and disconnector - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Object of the Invention] (Field of Industrial Application) The present invention relates to an arc extinguishing chamber of a puffer type gas circuit breaker.

(Prior Art) With the increase in capacity of power transmission systems, the breaking capacity required for circuit breakers used in substations and switchyards also increases, and high reliability is required. To increase the reliability of the circuit breaker, it is important to reduce the number of parts and simplify the structure. Therefore, the break point of the breaker is reduced. Therefore, it is necessary to increase the breaking capacity per point of the breaker.

(Problems to be Solved by the Invention) In the conventional general puffer type gas circuit breaker, it is necessary to increase the pressure in the puffer chamber in order to improve the blocking performance. The blocking capacity can be increased by moving at the opening speed and increasing the pressure of the gas in the puffer chamber and blowing it into the arc.

However, such a method not only increases the size of the arc-extinguishing chamber, but also requires a large drive device, which reduces the economics of manufacturing and operating the circuit breaker.

As a method of suppressing such economic loss and efficiently increasing the gas pressure in the puffer chamber, a method of utilizing the thermal energy of the arc has been proposed. It has been found that if this heat energy is skillfully used, the pressure of the gas in the puffer chamber can be increased and a strong arc spray can be obtained, so that the blocking performance can be improved.

The present invention has been made in view of the above circumstances, and provides a puffer-type gas circuit breaker that can obtain high blocking performance with a small size and with small driving energy by effectively utilizing the thermal energy of the arc at the time of blocking. It is an object of the invention.

[Structure of Invention]

(Means for Solving the Problems) In order to achieve the above object, the present invention provides a puffer type gas circuit breaker in which a hole is provided in the hollow portion of the operating rod, and the hollow portion of the operating rod and the puffer chamber are provided at the initial stage of the blocking operation. Through the hole, and in the latter half of the breaking operation, the hollow part of the operating rod and the breaker container are communicated through this hole, and a guide having a through hole is provided on the driving part side of the hole in the operating rod. It is characterized in that the cross-sectional area of the through hole is set to 1/2 or less of that of the operating rod.

(Operation) With the configuration described above, the arc energy at the initial stage of the shutoff operation of the puffer type gas circuit breaker is taken into the puffer chamber through the hollow part of the operating rod, is used to increase the pressure rise in the puffer chamber, and is cut off. The latter part of the operation is characterized in that the hollow portion of the operating rod is used as a heat exhaust path.

(Embodiment) An embodiment of the present invention will be described below with reference to FIGS. 1 and 2.

FIG. 1 shows the state of the arc-extinguishing chamber according to the present invention in the initial stage of the interruption operation, and FIG. 2 shows the state of the latter stage of the interruption operation.

In FIGS. 1 and 2, reference numeral 1 denotes a fixed contactor portion, which is composed of a fixed arc contactor 4 and a fixed energization contactor 3. Further, 2 is a movable contactor portion. A puffer cylinder 6, a movable arc contact 8, a movable energization contact 9, and an insulating nozzle 10 are fixed to the hollow operation rod 5. In the movable contact portion 2, the puffer cylinder 6 forms a puffer chamber 11 with the puffer piston 7 fixed to a fixed portion (not shown). As shown in FIG. 1, the hollow portion 5b of the operating rod 5 and the hole 5a communicating with the outside of the operating rod 5 are provided with the hollow portion 5b of the operating rod 5 and the puffer chamber in the initial cutting operation.
It is processed so that it communicates with the inside of 11. (Fig. 1) As shown in Fig. 2, when the hole 5a passes over the inner diameter end 7a of the puffer piston 7 in the latter stage of the cutting operation,
The hollow portion 5b of the operating rod 5 is configured to communicate with the surrounding gas space. At the rear end of the hollow portion 5b of the operation rod 5, there is provided a convex guide 5c for smoothly guiding the gas flow in the axial direction to the hole 5a.

In addition, the guide communicates with the hollow portions 5b and 5d of the operating rod 5. A through hole 5f is provided, and the operation rod 5
A hole 5e for letting out the gas passing through the through hole 5f to the outside of the operating rod 5 is formed on the driving portion side of the. However, this hole 5e is not always necessary when the hollow portion of the operating rod 5 is open.

[Action]

Next, the operation of the present invention will be described with reference to FIGS. As described above, FIG. 1 shows the initial state of the cutting operation.
In this state, the arc 13 generates a large amount of heat, and the hole 5a of the operating rod 5 is still in the puffer piston 7
The hole 5a communicates with the inside of the puffer chamber 11 since it does not pass through the end portion 7a.

On the other hand, in the initial stage of such shutoff, the puffer chamber 11
Since the internal pressure has not risen much due to the compression action of the piston, the expanded flow of gas from the arc 13 becomes a flow 12b passing through the hollow portion 5b of the rod 5 and suddenly flows into the puffer chamber 11. The expanded flow 12c also occurs in a conventional puffer type gas circuit breaker, but the thermal flow 12b is very large and can therefore effectively give heat to the gas in the puffer chamber 11. Since this adds to the original compression operation of the puffer piston 7 and the puffer cylinder 6, the pressure in the puffer chamber 11 increases.

After that, as shown in FIG. 2, the hole 5a is formed in the puffer piston 7
It passes through the end portion 7a and communicates with the surroundings. Therefore, the hollow portion 5b of the operating rod 5 is opened to the surrounding gas portion, and the heat from the arc is radiated. In such a state, the fixed arc contactor 4 has already been sufficiently opened from the nozzle 10 and thus is sufficiently opened, so that the current can be cut off. The heat taken into the puffer chamber 11 is almost evenly distributed in the cylinder 6, so that the high pressure rise continues until the blocking operation is completed. Therefore, since a high-speed gas flow is blown to the arc for a long time, a high breaking performance can be obtained.

Further, there is a through hole 5f for the guide 5c of the rod 5, and if the size of this hole is properly selected for the nozzle throat diameter, arc contact throat diameter, rod hole 5a, etc., the arc 13 A part 12c of the hot gas flow due to can be discharged also toward the drive unit 20 side of the operation rod 5, and since it has the same effect as the double flow system, it can be cut off in a short arc time and a short arc time.

However, if the through hole 5f is made too large, the compressed gas in the puffer chamber 11 will leak to the outside through the hole 5a of the operating rod and the through hole 5f. In order to reduce this leakage and to obtain the above-mentioned blocking effect, the cross-sectional area of the through hole 5f of this guide must be 1/2 or less of the cross-sectional area of the hollow portion of the rod. .

Further, as the volume of the puffer cylinder 6 is reduced, the puffer cylinder 6 is absorbed in order to capture the energy of the arc.
The increase in the internal pressure becomes extremely large, which causes an increase in driving force, which is not preferable. On the other hand, if the position of the hole 5a of the rod 5 is adjusted and the period of taking in the arc energy is significantly shortened, the puffer cylinder 6 is changed due to the phase of the cutoff current.
Since the energy taken into the inside fluctuates greatly and the pressure rise remarkably differs, the blocking performance becomes unstable. On the other hand, if the size of this hole 5a is made extremely small and the amount of arc energy taken in is limited, this hole will become the end of the puffer piston.
When the flow exceeds 7a and switches to double flow to suppress the pressure rise in the puffer cylinder and improve the cutting performance, it becomes impossible to discharge hot gas sufficiently. Therefore, if the guide 5c is provided with a through hole 5f and the rod 5 is further provided with a hole 5e, a part of the hot gas is discharged through the through hole 5f as in the case of 12c in the initial stage of operation, so that the pressure inside the puffer cylinder 6 is increased. It can be controlled, and even if the arc energy is taken into the puffer cylinder 6 for a relatively long period of time, the pressure does not increase excessively, so that stable performance can be obtained for various arc times.

〔The invention's effect〕

As described above, according to the present invention, a higher pressure rise can be obtained in the puffer chamber as compared with the conventional example. Therefore, a puffer-type gas circuit breaker having a high interruption performance is provided by a small arc-extinguishing chamber and a small drive device. can do.

[Brief description of drawings]

FIG. 1 is a sectional view showing an embodiment of the initial stage of the cutting operation of the present invention, and FIG. 2 is a sectional view showing an embodiment of the latter stage of the cutting operation of the present invention. 1 ... Fixed contact part, 2 ... Movable contact part, 3 ... Fixed current contact part, 4 ... Fixed arc contact part, 5 ... Operation rod, 5a ... Operation rod hole part, 5b ... Operation Hollow part of rod,
5c ...... guide, 5d ...... operation rod hollow part, 5e ...... operation rod hole, 5f ...... through hole, 6 ...... puffer cylinder, 7 ...
… Puffer piston, 7a …… Puffer piston end, 8
...... Movable arc contactor, 9 ...... Movable current contactor, 10 ......
Insulation nozzle, 11 …… Puffer chamber, 12 …… Gas flow, 12a, 12
b, 12c …… hot gas flow, 13 …… arc.

Claims (1)

[Claims] Claim: What is claimed is: 1. A container filled with an arc-extinguishing gas has a fixed contact part and a movable contact part which can be contacted and separated from each other, and a puffer piston and a puffer cylinder provided on the movable contact part. By compressing the puffer chamber, the gas in the puffer chamber is compressed and guided to the nozzle part, and this compressed gas is fixed and blown to the arc generated between the movable arc contacts to cool and extinguish the arc. In the puffer type gas circuit breaker, a hole is provided in the hollow part of the operating rod that drives the puffer cylinder, and the hollow part of the operating rod and the puffer chamber are communicated with each other through the hole in the initial stage of the blocking operation, and the latter part of the blocking operation is performed. Is configured to communicate the hollow portion of the operating rod with the container through the hole, and further provided with a guide having a through hole on the driving portion side of the hole in the operating rod. Puffer type gas circuit breaker, characterized in that the that of 1/2 or less of the operating rod the cross-sectional area of the through holes.