JPS6319721A - Buffer type gas breaker - Google Patents

Abstract

(57) [Abstract] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

[Detailed description of the invention] [Purpose of the invention] (Industrial application field) The present invention relates to an arc extinguishing chamber of a puffer type gas breaker.

(Prior Art) As the capacity of power transmission systems increases, the amount of disconnection required of circuit breakers used in substations and switchyards increases, and high reliability is also required. In order to improve the reliability of circuit breakers, it is important to reduce the number of parts and simplify the structure. Therefore, efforts are being made to reduce the number of breaking points in circuit breakers. Therefore, it is necessary to increase the resistance ω per point of the circuit breaker.

(Problem to be solved by the invention) In conventional general puffer type gas breaker, it is necessary to increase the pressure inside the puffer chamber in order to improve the breaker performance. If the gas in the puffer chamber is made high-pressure and blown onto the arc by opening the gas at the opening speed, it is possible to increase the interruption rate.

However, such a method not only increases the size of the arcing chamber but also requires a large drive device, making the breaker uneconomical to manufacture and operate.

As a method of suppressing such economic losses 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 by skillfully utilizing this thermal energy, it is possible to increase the pressure of the gas in the puffer chamber and obtain powerful arc spray, thereby increasing the shutoff performance.

The present invention has been made in view of the above circumstances, and provides a puffer type gas breaker that is compact and has high breaking performance of 1q with small drive energy by effectively utilizing the thermal energy of the arc during breaking. It is an object of the present invention to do so.

[Structure of the invention]

(Means for Solving the Problems) In order to achieve the above object, the present invention provides a puffer type gas breaker with a hole in the hollow part of the operating rod, and in the initial stage of the breaker operation, the hollow part of the operating rod and the puffer chamber are communicated through this hole, and in the later stages of the breaker operation, the hollow part of the operating rod and the breaker container are communicated through this hole, and a guide having a through hole on the driving part side of the hole in the operating rod , and the cross-sectional area of this through-hole is 172 mm or less than that of the operating rod.

(Function) By configuring as described above, the arc energy at the initial stage of the breaker operation of the puffer type gas breaker is taken into the puffer chamber through the hollow part of the operating rod, and used to increase the pressure rise in the puffer chamber. The latter half of the shutoff operation is characterized by using the hollow part of the operating rod as a heat exhaust path.

(Example) An example 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 early stage of the shutoff operation, and FIG. 2 shows the state in the latter half of the shutoff operation.

In FIGS. 1 and 2, reference numeral 1 denotes a fixed contact portion, which is composed of a fixed arc contact 4 and a fixed current-carrying contact 3. Further, 2 is a movable contact portion. A puffer cylinder 6, a movable arc contact 8, a movable energizing contact 9, and an insulating nozzle 10 are fixed to a hollow operating rod 5. In the movable contact portion 2, the puffer cylinder 6 and the puffer piston 7 fixed to a fixed portion (not shown) move the puffer 1! ! 11 is formed. As shown in FIG.
b is processed so as to communicate with the inside of the puffer chamber 11. (Fig. 1) As shown in Fig. 2, this hole 5a communicates with the hollow part 5b of the operating rod 5 and the surrounding gas space when it passes the inner diameter end 7a of the puffer piston 7 in the latter half of the shutoff operation. It is configured. A convex guide 5C is provided at the rear end of the hollow portion 5b of the operating rod 5 to smoothly guide the gas flow in the axial direction to the hole 5a.

This guide also has a hollow portion 5b of the operating rod 5.

5d. A through hole 5f is provided, and a hole 5e is further provided on the driving portion side of the operating rod 5 for letting the gas passing through the through hole 5f out of the operating rod 5.

However, this hole 5e is not necessarily required when the hollow portion of the operating rod 5 is open.

[For production]

Next, the present invention will be explained in detail with reference to FIGS. 1 and 2. As mentioned above, FIG. 1(t) shows the initial state of the cutoff operation. In this state, the arc 13 is generating a large amount of heat, and the hole 5a of the operating rod 5 has not yet passed the end 7a of the puffer piston 7, so the hole 5a communicates with the inside of the puffer chamber 11. .

On the other hand, at the beginning of such a cutoff, all puffers
Since the pressure inside the arc 13 has not increased much due to the compression action of the piston, the expanding flow of gas from the arc 13 is
The flow becomes a flow 12b passing through the hollow portion 5b of the rod 5, and rapidly flows into the puffer chamber 11. The expansion flow 12c also occurs in a conventional puffer type gas breaker, but the flow 12c due to heat
2b is very large and can therefore effectively impart heat to the gas within the puffer chamber 11. Since this is added to the original compression operation of the puffer piston 7 and the buff 7 cylinder 6, the pressure inside the puffer chamber 11 increases.

The hole 5a then passes through the end 7a of the puffer piston 7 and communicates with the surroundings, as shown in FIG. Therefore, the hollow portion 5b of the operating rod 5 is open to the surrounding gas, and heat from the arc is released.

In such a state, the fixed arc contact 4 is already
Since the center is sufficiently protruded from the nozzle 10, the opening is sufficiently large, so that the current can be cut off. Since the heat taken into the puffer chamber 11 is almost uniformly distributed within the cylinder 6, the high pressure rise continues until the shutoff operation is completed. Therefore, since a high-speed gas flow is blown onto the arc for a long time, high breaking performance can be achieved by 1q.

Furthermore, a through hole 5f is required in the guide 5C of the rod 5, and if the size of this hole is carefully selected in relation to the nozzle throat diameter, the arc contactor throat diameter, the rod hole 5a, etc., the arc can be prevented even at the beginning of the breaking operation. Part 12G of hot gas flow due to 13
can also be discharged toward the side of the drive unit 20 of the operating rod 5, and has the same effect as the double flow system, so it can be cut off in a short arc time.

However, if this through hole 5f is made too large,
The compressed gas in the puffer chamber 11 leaks to the outside through the hole 5a of the operating rod and the through hole 5f. In order to reduce this leakage and obtain the above-mentioned effect on blocking, the cross-sectional area of the through hole 5f of this guide needs to be 172 times or less the cross-sectional area of the hollow portion of the rod.

Also, as the volume of the buff 7 cylinder 6 is reduced, the puffer cylinder 6
The internal pressure rise becomes extremely large, leading to an increase in driving force, which is undesirable. However, if the position of the hole 5a of the rod 5 is adjusted to significantly shorten the arc energy intake period, the energy intake into the puffer cylinder 6 will vary greatly depending on the phase of the cutoff current, resulting in a significant pressure rise. Because they are different, the breaking performance becomes unstable. - On the other hand, if the size of this hole 5a is significantly reduced to limit the intake of arc energy, this hole will switch to double flow beyond the puffer piston end 7a, suppressing the pressure rise inside the puffer cylinder, and blocking it. When performance should be improved, hot gas cannot be sufficiently discharged. Therefore, if a through hole 5f is provided in the guide 5C and a hole 5e is provided in the rod 5, this through hole 5 is provided at the initial stage of operation.
Because a part of the hot gas is exhausted like 12G through f,
The rise in pressure inside the puffer cylinder 6 can be il-controlled, and even if arc energy is taken into the puffer cylinder 6 for a relatively long period of time, the pressure will not rise excessively, so stable performance can be obtained even for various arc times.

〔Effect of the invention〕

As described above, according to the present invention, a higher pressure rise can be obtained in the puffer chamber than in the conventional example, so a puffer-type gas breaker with high breaking performance can be manufactured in a small arc extinguishing chamber and with a small drive device. can be provided.

[Brief explanation of drawings]

FIG. 1 is a sectional view showing an embodiment of the present invention in the early stage of the shutoff operation, and FIG. 2 is a sectional view showing an embodiment of the present invention in the latter stage of the shutoff operation. 1... Fixed contact part, 2... Movable contact part, 3...
・Fixed current-carrying contact, 4...Fixed arc contact, 5...
・Operation rod, 5a...Operating rod hole, 5b...
Operating rod hollow part, 5C... Guide, 5d... Operating rod hollow part, 5e... Operating rod hole, 5f... Through hole, 6... Puffer cylinder, 7... Puffer piston, 7a ... Puffer piston end, 8... Movable arc contact, 9... Movable energizing contact,
10... Insulating nozzle, 11... Puffer chamber, 12.
... Gas flow, 12a, 12b, 12G... Hot gas flow,
13... Ark.

Claims (1)

[Claims] (1) A puffer comprising a fixed contact part and a movable contact part that can be moved in and out of a container filled with arc-extinguishing gas, and a puffer piston and a puffer cylinder provided in the movable contact part. By compressing the chamber, the gas in the puffer chamber is compressed and guided to the nozzle section, and this compressed gas is blown onto the arc generated between the fixed and movable arc contacts, cooling and extinguishing the arc. In the puffer type gas breaker, a hole is provided in the hollow part of the operating rod that drives the puffer cylinder, and at the initial stage of the breaker operation, the hollow part of the operating rod and the puffer chamber are communicated through the hole, and the breaker is cut off. In the latter stage of the operation, the hollow part of the operating rod and the container are configured to communicate through the hole, and a guide having a through hole is provided on the driving part side of the hole in the operating rod, and the through hole is cut off. The area is 1/ that of the operating rod
A puffer-type gas shield and disconnector characterized in that the temperature is 2 or less.