JPH05166441A - Puffer type gas circuit breaker arc extinguish chamber - Google Patents

Abstract

PURPOSE:To provide an excellent puffer type gas circuit breaker arc extinguishing chamber while suited for the demand for miniaturization of the breaker and improvement of mechanical reliability further with high efficiency of discharging heat gas and capable of contributing to improvement of breaking performance. CONSTITUTION:An exhaust hole 4a for discharging gas in a hollow part to the outside is provided in a hollow operating rod 4 for driving the first electrode 3. A distance Lx between a point end of the first electrode 3 and the exhaust hole 4a at the time of closing the first/second electrodes 3, 21 is set smaller than a distance Lf from the point end of the first electrode 3 to a front face of constituting a puffer chamber 7 of a puffer piston 6. The second electrode 21 is connected to the first electrode 3 through a link mechanism 25 and moved according to moving in an opening direction of the first electrode 3. A relative moving distance Lr of the above mentioned first/second electrodes 3, 21 is set larger than a moving distance Lm of the first electrode 3.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an improvement in the breaking performance of an arc-extinguishing chamber of a puffer type gas circuit breaker used in a switching station or a substation of a power system.

[0002]

2. Description of the Related Art A puffer type gas circuit breaker uses a gas such as SF ₆ as an arc extinguishing medium and compresses the gas in a compression chamber called a puffer chamber by the relative movement of a cylinder and a piston accompanying the opening of a contact. However, it is a type of gas circuit breaker that blows on an arc to extinguish it. FIG. 2 shows an example of a conventional general puffer type gas circuit breaker arc extinguishing chamber.

As shown in FIG. 2, a movable electrode portion 1 and a fixed electrode portion 2 are arranged to face each other in a container (not shown) filled with an arc extinguishing gas. The movable arc contactor 3 provided on the movable electrode portion 1 is arranged on an extension line of the operation rod 4 at one end of the hollow operation rod 4, and is integrally fixed to the operation rod 4 together with the puffer cylinder 5. In this case, the puffer cylinder 5 is arranged on the outer peripheral portion of the end portion of the operation rod 4 on the movable arc contactor 3 side,
It is fixed to the end portion of the operating rod 4 via the flange portion 5a. Further, the operation rod 4 is connected to a drive device (not shown) provided in the right direction in the figure, and is driven in the left and right directions in the figure. Further, an exhaust hole 4a and a guide portion 4b are provided in the central portion of the operating rod 4 so that the hot gas in the hollow portion can be exhausted to the outside of the operating rod 4.

A puffer piston 6 is inserted into the space between the outer peripheral surface of the operating rod 4 and the inner peripheral surface of the puffer cylinder 5, and the front surface of the puffer piston 6 forms a puffer chamber 7 in the puffer cylinder 5. Has been done. Further, the first guide member 8 is provided on the outer periphery of the puffer cylinder 5.
A second guide member 9 is provided on the outer peripheral portion of the operation rod 4 on the drive device side of the puffer piston 6. The puffer piston 6 and the first and second guide members 8 and 9 are connected by a connecting member 10 and integrally fixed to a container (not shown). The connecting member 10 has a communication portion 10 a that connects the space between the inner surface of the connecting member 10 and the outer surface of the operating rod 4 and the external space of the connecting member 10.

An insulating nozzle 11 and a movable energizing contact 12 are sequentially arranged on the outer circumference of the movable arc contact 3 and fixed to the flange portion 5a of the puffer cylinder 5. And between the movable arc contactor 3 and the insulating nozzle 11,
A gas flow path 13 is formed, and the high-speed gas flow that is compressed in the puffer chamber 7 and is ejected to the outside by the ejection holes 5b of the flange portion 5a is guided to the arc. Further, the fixed electrode portion 2 has a fixed arc contactor 14 and a fixed energization contactor 15, and is fixed to a container (not shown).

[0006] In the puffer type gas circuit breaker arc extinguishing chamber of Fig. 2 having the above-mentioned structure, when the shutoff operation is performed at the time of energizing the current, the operating rod 4 is moved to the right in the figure by a driving device (not shown). The movable arc contactor 3 and the fixed arc contactor 14 are separated by moving the movable arc contactor 3 in a certain breaking direction. As a result, an arc is generated between the contacts 3 and 14. Further, since the puffer cylinder 5 also moves to the right in the figure simultaneously with the operation of the movable arc contactor 3, the gas in the puffer chamber 7 is moved by the relative movement between the puffer piston 6 and the fixed puffer piston 6. Is compressed. This compressed gas flows as a high-speed gas flow through the ejection holes 5b and the gas flow path 13 and is sprayed on the arc between the contacts 3 and 14 to cool and extinguish the arc. The gas in the hollow portion of the operating rod 4 expanded by the arc energy is exhausted to the outside through the exhaust hole 4a. Therefore, the gas flow in the hollow portion formed by the exhaust also contributes to the cooling of the arc.

[0007]

By the way, in order to complete the current interruption, it is necessary to sufficiently maintain the insulation between the contacts against the voltage applied between the contacts after the interruption operation. .. After the arc is extinguished at the current zero point, the insulation between the contacts is restored by two recovery processes, a thermal recovery process and a dielectric recovery process. Of these, thermal recovery is
This is a process in which the arc plasma remaining due to the electric current is cooled and loses electrical conductivity. Also, the dielectric recovery is
This is the process of recovering the insulation of the residual arc plasma that has lost its electrical conductivity and the process of cooling and recovering the hot gas exposed to the arc.

In order to improve the dielectric recovery characteristic, it is important to efficiently discharge the thermal energy injected by the arc by blowing gas from the puffer chamber. Therefore, measures such as increasing the gas pressure in the puffer cylinder to increase the gas density to increase the outflow of enthalpy or increasing the inner diameter of the nozzle to increase the outflow of enthalpy are adopted. However, these measures result in an increase in the compression cross-sectional area of the cylinder, which leads to an increase in the size of the arc-extinguishing chamber and an increase in the mechanical force and drive energy required for the drive unit that drives the contactor. However, it is considered to be unfavorable for downsizing the circuit breaker and improving the mechanical reliability.

In order to efficiently discharge the hot gas, it is effective to reduce the resistance of the gas passage. In particular, as shown in FIG. 2, the exhaust hole of the operating rod is arranged so as to be always positioned behind the front surface of the piston, and the hot gas is blown out from the hollow portion of the operating rod through the exhaust hole. In many cases, the loss is large on the gas passage having a long hollow portion, and high discharge efficiency cannot be obtained in many cases.

On the other hand, as shown in FIG. 3, the exhaust hole of the operating rod is provided at a position close to the movable arc contact, so that the efficiency of discharging hot gas from the hollow portion of the operating rod is improved. Is also proposed. However, when the distance to the exhaust hole is extremely small, the exhaust hole comes to the rear of the piston at the end of the contact opening operation, so that sufficient discharge cannot be performed.

On the other hand, in the puffer type gas circuit breaker,
A configuration has also been proposed in which the relative opening speed of the contactor is increased by operating the arc contactor on the opposite side in the opposite direction via the link mechanism as the movable arc contactor operates. In this configuration, the moving distance of the movable arc contact can be shortened, and as a result, the exhaust hole of the operating rod can be provided at a position close to the movable arc contact.

However, in the conventional puffer type gas circuit breaker arc extinguishing chamber as described above, although it is possible to improve the discharge efficiency of the hot gas to some extent, it is hard to say that sufficient discharge efficiency is realized. ..

The present invention has been proposed in order to solve the problems of the prior art as described above, and its object is to meet the requirements of downsizing of the circuit breaker and improvement of mechanical reliability. Moreover, it is an object of the present invention to provide an excellent puffer-type gas circuit breaker arc extinguishing chamber which has a high efficiency of discharging hot gas and can contribute to the improvement of the breaking performance.

[0014]

A puffer type gas circuit breaker arc extinguishing chamber according to the present invention comprises a container filled with arc extinguishing gas,
The first and second electrodes which can be contacted and separated are arranged to face each other, and
Is fixed to one end of a hollow operation rod connected to a drive together with a puffer cylinder, and a puffer chamber is formed by the puffer cylinder and a front face of a puffer piston slidable in the puffer cylinder, and a shutoff operation is performed. Sometimes, the operating rod is moved in the opening direction to move the first electrode in the opening direction, and at the same time, the arc extinguishing gas in the puffer chamber is compressed by the relative movement of the puffer cylinder and the puffer piston. In a puffer type gas circuit breaker arc extinguishing chamber in which gas is ejected as a high-speed gas flow through an insulating nozzle fixed to a puffer cylinder and is blown to an arc generated between the first and second electrodes to extinguish the arc. The operation rod is provided with an exhaust hole that communicates the hollow portion with the outside and discharges the gas in the hollow portion to the outside. The distance Lx from the first electrode tip to the exhaust hole when the second electrode is closed is between the first electrode tip and the front surface forming the puffer chamber of the puffer piston when the second electrode is closed. The second electrode is configured to be smaller than the distance Lf, is held in contact with the current-carrying portion at the tip of the current-carrying conductor supported from the opposite direction of the driving device, and is linked to the first electrode. Connected via a mechanism and configured to move with the movement of the first electrode in the opening direction. The relative movement distance Lr of the first and second electrodes is the movement distance of the first electrode. It is characterized in that it is configured to be larger than Lm.

A link mechanism for connecting the first and second electrodes is arranged on the driving device side of the operating rod in parallel with the moving direction of the operating rod, and the exhaust hole of the operating rod has the moving direction. It is desirable to arrange them in a direction orthogonal to. Furthermore, it is desirable that the distance between the first movable arc contactor and the throat, which is the outlet of the insulating nozzle, be as long as possible.

[0016]

In the present invention having the above structure,
First, the distance from the tip of the first electrode (movable arc contactor) to the exhaust hole can be made smaller than the structure in which the exhaust hole of the operating rod is always positioned behind the front surface of the piston.

That is, for example, as a comparative example with respect to the present invention, the arc contactors on both sides are made movable arc contactors, and the exhaust hole of the operating rod is provided as in the conventional example of FIG.
It is assumed that the piston is always positioned behind the front surface of the piston. In this case, the distance Lx from the first movable arc contactor to the exhaust hole is the distance Lf from the tip of the first movable arc contactor to the front surface of the puffer piston at the time of closing, and the distance Lf and the second movable distance. The total distance {Lf + (Lr-L) with the moving distance (Lr-Lm) of the arc contactor.
m)}.

On the other hand, in the present invention, this distance Lx
Can be reliably made smaller than the distance {Lf + (Lr-Lm)}. Specifically, when the exhaust is performed at a position half of the opening / closing operation of the arc contactor, the distance Lx is set to the distance Lf.
Therefore, the distance Lx can be reduced to less than half of the distance {Lf + (Lr-Lm)}. Therefore, the loss on the gas flow path can be reduced and the discharge efficiency can be improved.

On the contrary, when the distance Lx is made extremely small, the exhaust hole comes to the rear of the piston at the end of the contact opening operation, so that sufficient discharge cannot be performed. However, in the present invention, by appropriately setting the distance Lx, it is possible to sufficiently effectively discharge the gas during the opening operation.

Further, when the link mechanism is arranged on the driving device side of the operation rod in parallel with the moving direction of the operation rod and the exhaust hole of the operation rod is arranged in the orthogonal direction, the exhaust gas from the exhaust hole is It can be discharged smoothly without being hindered by the link mechanism. Furthermore, when the distance between the first movable arc contact and the throat, which is the outlet of the insulating nozzle, is set as long as possible, the gas blown out from the insulating nozzle can act on a wide range of arcs.

[0021]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of a puffer type gas circuit breaker arc extinguishing chamber according to the present invention will be specifically described below with reference to FIG. The same parts as those in the conventional example shown in FIGS. 2 and 3 are designated by the same reference numerals.

As shown in FIG. 1, in a container (not shown) filled with an arc extinguishing gas, a second movable arc contactor (first electrode) 3 The arc contacts (second electrodes) 21 are arranged to face each other. The configuration on the first movable arc contactor 3 side is basically the same as that of the conventional example of FIG. 2 described above.

That is, the first movable arc contactor 3 is
It is arranged on an extension line of the operation rod 4 at one end of the hollow operation rod 4, and is integrally fixed to the operation rod 4 together with the puffer cylinder 5. In this case, the puffer cylinder 5 includes the first movable arc contactor 3 of the operating rod 4.
It is arranged on the outer peripheral portion of the side end portion and is fixed to the end portion of the operation rod 4 via the flange portion 5a. Further, the operation rod 4 is connected to a drive device (not shown) provided in the right direction in the figure, and is driven in the left and right directions in the figure. Further, an exhaust hole 4a and a guide portion 4b are provided in the central portion of the operating rod 4 so that the hot gas in the hollow portion can be exhausted to the outside of the operating rod 4.

A puffer piston 6 is inserted into a space between the outer peripheral surface of the operating rod 4 and the inner peripheral surface of the puffer cylinder 5, and the front surface of the puffer piston 6 allows the puffer chamber 7 to be accommodated in the puffer cylinder 5. Are formed. Further, an insulating nozzle 11 and a movable energizing contact 12 are sequentially arranged on the outer periphery of the first movable arc contact 3 and fixed to the flange portion 5 a of the puffer cylinder 5. Further, a gas flow path 13 is formed between the first movable arc contactor 3 and the insulating nozzle 11, is compressed in the puffer chamber 7, and is ejected to the outside by the ejection hole 5b of the flange portion 5a. It is designed to guide the gas flow to the arc.

On the other hand, the second movable arc contactor 21 is integrally fixed together with the support plate 22 and the current-carrying cylinder 23 on the back surface thereof to form a second movable electrode portion. in this case,
The current-carrying cylinder 23 is held in contact with the current-carrying portion at the tip of a fixed conductor (current-carrying conductor) 24 supported from the opposite direction of the drive device. Then, the second movable arc contactor 21
Is the first movable arc contactor 3 via the link mechanism 25.
And is configured to move with the movement of the first movable arc contactor 3 in the opening direction.

That is, the operation rod 4 formed by integrally fixing the first movable arc contactor 3 has a
To link mechanism 2 including third links 25a to 25c
5 is arranged in parallel with the moving direction of the operation rod 4, and is connected to the support plate 22 via an insulating rod 26 arranged on the outer periphery of the puffer cylinder 5. With this configuration,
Along with the operation of the operating rod 4 toward the drive unit, the first movable arc contactor 3 moves in the opening direction, which is the same direction, and the second movable arc contactor 21 opens in the opposite direction. It is designed to move away. In other words, the relative moving distance Lr of the first and second movable arc contacts 3 and 21 is the moving distance Lm of the first movable arc contact 3.
It is configured to move in opposite directions so as to become larger. Further, reference numeral 27 in the figure is a support member that supports the puffer piston 6 and the second link 25b of the link mechanism 25, and is fixed to a container (not shown) via a fixing member 28.

In this embodiment, the exhaust hole 4a of the operating rod 4 has a distance Lx from the tip of the first movable arc contactor 3 to the exhaust hole 4a.
Is arranged so as to be smaller than the distance Lf from the tip of the to the front surface of the puffer piston 6. More specifically, in the exhaust hole 4a, the distance Lx is the distance Lf from the tip of the first movable arc contactor to the front surface of the puffer piston at the time of closing, and the distance Lf and the moving distance of the second movable arc contactor. (Lr-Lm) total distance {Lf + (Lr-L
m)}.

In the puffer type gas circuit breaker arc extinguishing chamber of the present embodiment having the above-mentioned structure, when the interruption operation is carried out when a current is applied, the operating rod 4 is moved rightward in the figure by a driving device (not shown). In the breaking direction, whereby the first and second movable arc contacts 3 and 21 are moved in the opening direction. As a result, an arc is generated between the first and second movable arc contacts 3 and 21. Also,
Simultaneously with the operation of the first and second movable arc contacts 3, the puffer cylinder 5 also moves to the right in the figure, and the relative movement between the puffer chamber 6 and the fixed puffer piston 6 causes the puffer chamber to move. The gas in 7 is compressed. This compressed gas flows as a high-speed gas flow through the ejection holes 5b and the gas flow path 13, and the first and second movable arc contacts 3,
It is blown onto the arc between 21 to cool it and extinguish it.

Further, in this embodiment, the position of the exhaust hole 4a of the operating rod 4 is set so that the distance Lx is about half of the distance {Lf + (Lr-Lm)} as described above. Therefore, the first and second movable arc contacts 3, 2
In the middle of the opening / closing operation of No. 1, the exhaust hole 4a moves to the rear of the front surface of the puffer piston 6 and is ready to be exhausted to the external surrounding space. Therefore, since the gas in the hollow portion of the operating rod 4 expanded by the arc energy can be discharged to the outside from the exhaust hole 4a during such a separation operation, the gas can be discharged sufficiently effectively. .. In this case, since the length of the gas flow path to the exhaust hole 4a in the hollow portion of the operation rod 4 is short, the loss on the gas flow path can be reduced and the discharge efficiency can be improved. in addition,
In this embodiment, the link mechanism 25 is connected to the operation rod 4
On the side of the drive device of, and parallel to the moving direction, and
Since the exhaust holes 4a of the operation rod 4 are arranged in the orthogonal direction, the exhaust gas from the exhaust holes 4a can be smoothly discharged without being obstructed by the link mechanism 25.

The present invention is not limited to the above embodiment, and the following modifications are possible, for example. That is, the arrangement configuration of the exhaust holes 4a of the operation rod 4,
Also, when the relationship between the first and second movable arc contacts 3 and 21 is set as in the above-described embodiment, the discharge efficiency to the first movable arc contact 3 side can be improved as described above. Therefore, further, the first movable arc contactor 3 and the insulating nozzle 1
By making the distance to the throat, which is the blowout port of 1, as long as possible, the gas blown out from the insulating nozzle 11 can be made to act on the arc in such a wide range.

[0031]

As described above, according to the present invention,
The distance from the tip of the first electrode to the exhaust hole of the operating rod at the time of closing is configured to be smaller than the distance from the tip of the first electrode to the front surface of the puffer piston, and the electrodes on both sides are separated from each other. By configuring to move in the opening / closing direction, while satisfying the demands for downsizing of the circuit breaker and improvement of mechanical reliability, the discharge efficiency of hot gas is high and it can contribute to the improvement of the breaking performance. Such an excellent puffer type gas circuit breaker arc extinguishing chamber can be provided.

[Brief description of drawings]

FIG. 1 is a cross-sectional view showing an embodiment of a puffer type gas circuit breaker arc extinguishing chamber according to the present invention.

FIG. 2 is a cross-sectional view showing an example of a conventional puffer type gas circuit breaker arc extinguishing chamber.

FIG. 3 is a cross-sectional view showing an example of a conventional puffer type gas circuit breaker arc extinguishing chamber.

[Explanation of symbols]

 3 ... 1st movable arc contactor (1st electrode) 4 ... Operation rod 4a ... Exhaust hole 5 ... Puffer cylinder 6 ... Puffer piston 7 ... Puffer chamber 11 ... Insulation nozzle 21 ... Second movable arc contactor 2 electrode) 22 ... Support plate 23 ... Conducting cylinder 24 ... Fixed conductor (conducting conductor) 25 ... Link mechanism 26 ... Insulating rod 27 ... Support member 28 ... Fixing member

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Hitoshi Mizoguchi 2-1, Ukishima-cho, Kawasaki-ku, Kawasaki-shi, Kanagawa Stock company Toshiba Hamakawasaki Factory

Claims (1)

[Claims] 1. A first and a second electrode which can be contacted and separated from each other are arranged to face each other in a container filled with an arc-extinguishing gas, and the first electrode is a hollow operation rod connected to a drive unit. Is fixed together with a puffer cylinder at one end of the puffer cylinder, and a puffer chamber is formed by the puffer cylinder and a front face of a puffer piston slidable in the puffer cylinder. While moving the first electrode in the opening direction, the arc extinguishing gas in the puffer chamber is compressed by the relative movement of the puffer cylinder and puffer piston, and this compressed gas is passed through the insulating nozzle fixed to the puffer cylinder at high speed. In a puffer type gas circuit breaker arc extinguishing chamber, which ejects as a gas flow and blows on an arc generated between the first and second electrodes to extinguish the arc. The lid is provided with an exhaust hole that communicates the hollow portion with the outside and discharges the gas in the hollow portion to the outside. From the tip of the first electrode when the first and second electrodes are closed. The distance Lx to the exhaust hole is configured to be smaller than the distance Lf from the tip of the first electrode to the front surface forming the puffer chamber of the puffer piston when the electrode is closed, and the second electrode is , Is held in contact with the current-carrying portion at the tip of the current-carrying conductor supported from the opposite direction of the driving device, and is connected to the first electrode via a link mechanism, in the opening direction of the first electrode. Of the first and second electrodes, the relative movement distance Lr of the first and second electrodes is larger than the movement distance Lm of the first electrode. Gas circuit breaker arc extinguishing room.