JPH0473834A - Puffer type gas-blast circuit-breaker with closing resistance - Google Patents

Abstract

PURPOSE:To reduce the number of parts, and to reduce the space of installation by providing a closing resistance supporting part integrated with an insulating spacer in such a way that a main circuit conductor is surrounded thereby, and by arranging closing resistance on the outer periphery of the closing resis tance supporting part. CONSTITUTION:A cylindrical closing resistance supporting part 21 is formed on the center part of an insulating spacer 20, in an integrated manner, and is arranged in such a way that a main circuit conductor 10 connected with a main contact is surrounded thereby. A closing resistance 22 is arranged on the outer periphery of the closing resistance supporting part 21, and the closing resistance 22 is connected with the main circuit in parallel through a fixed electrode 3d for closing resistance contact. A supporting member such as an insulating cylinder used for supporting the closing resistance is no more needed, nor the space for the installation thereof. The size of the entire body of a circuit-breaker is reduced, and the number of parts is reduced, for the closing resistance supporting part 21 is integrated with the insulating spacer.

Description

DETAILED DESCRIPTION OF THE INVENTION [Objective of the Invention (Industrial Application Field) The present invention relates to a puffer type gas circuit breaker with a closing resistor in which the arrangement of the closing resistor is improved.

(Prior Art) As the capacity of power transmission systems increases, the breaking capacity of circuit breakers used in substations and switchyards increases, and high reliability is 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 of circuit breakers. For example, in the current 550KV system, the breaking current is 50KA.
Although a point-break puffer type gas circuit breaker has been put into practical use, there is a demand for a one-point break.

By the way, in puffer type gas circuit breakers for lines in large-capacity systems such as 550 KV class, a closing resistance method is adopted in order to suppress the closing overvoltage at the time of closing. In this system, a closing resistance contact with a closing resistance is installed in parallel with the main contact of a puffer type gas circuit breaker, and when closing, this closing resistance contact is closed before the main contact, and the closing overvoltage is suppressed by the closing resistance. The main contact is closed in the state.

An example of employing the closing resistance method in the puffer type gas circuit breaker as described above is disclosed in Japanese Patent Laid-Open No. 64-89127, which will be described below with reference to FIG. That is, the circuit breaker 1 is a horizontal circuit breaker, and the gas tank 12
Inside, an arc extinguishing chamber 2 and a resistance contact section 3 are connected in parallel and arranged, and one end of the arc extinguishing chamber 2 and the resistance contact section 3 is connected to a gas tank via a movable support 4 and an insulating cylinder 5. It is supported by 12. Further, a mechanism box 7 is attached to the gas tank 12, and a drive section (not shown) is housed inside the mechanism box 7. Further, the resistance contact portion 3 includes closing resistors 3a, 3.
b, consisting of a fixed electrode 3d for making resistance contact connected in series with these via support conductor 3c, a movable electrode 3e for making resistance contact making contact with and separating from the fixed electrode 3d, and a support conductor 3f supporting it on the movable support 4. has been done. The fixed electrode 3d for the closing resistance contact is fixed to the support conductor 3c by a known means such as a spring 3g. Furthermore, the closing resistors 3a and 3b are connected to each other by the insulating cylinder 6 and the connecting conductor 11.
It is supported by a gas tank 12.

On the other hand, the arc extinguishing chamber 2 includes a main contact movable electrode 2a driven by a drive unit (not shown) disposed in the mechanism box 7.
s It is composed of a movable part consisting of a puffer cylinder 2b and an insulating nozzle 2c fixed thereto, a main hexagonal fixed electrode 2d, and an insulating tube 2e. The movable side of the arcing chamber is connected to other devices via the connection conductor 9, and the fixed side of the arcing chamber is connected to the connecting portion 2f and the main circuit conductor 10.
, a connector 8a and an insulating spacer 8 that supports these.

The conventional puffer type gas circuit breaker configured in this manner operates as described below. That is, at the time of closing the circuit breaker, first, the movable electrode 3e for the closing resistance contact and the fixed electrode 3d for the closing resistance contact come into contact, and the closing resistors 3a, 3b are connected to the circuit for a certain period of time. After that, the main contact movable electrode 2
a is in contact with the main contact fixed electrode 2d, and the closing resistor 3a,
3b is shorted and the circuit breaker is closed. On the other hand, at the time of interruption, first the movable electrode 3e for making resistance contact and the fixed electrode 3d for making resistance contact are opened, and then the movable electrode 2a for main contact and the fixed electrode 2d for main contact are separated, resulting in the interruption state.

(Problems to be Solved by the Invention) However, the conventional puffer type gas circuit breaker as described above has the following problems to be solved. That is, when interrupting the current, the main contact movable electrode 2a of the circuit breaker 1
Although an arc occurs between the main contact fixed electrode 2d and the main contact fixed electrode 2d, this arc is extinguished by spraying gas compressed by the puffer cylinder 2b along the insulating nozzle 2c. However, at this time, a large amount of hot gas heated by the arc is generated. Since this hot gas flows in the direction of the arrow in Fig. 4, the insulation performance near the insulating tube 6 disposed on the downstream side thereof is significantly reduced, and the insulation performance is weaker than that of the gas gap. There was a risk that the insulation performance of the cylinder 6 in the creeping direction would deteriorate, and there was a high risk of an internal circuit occurring immediately after disconnection.

Therefore, in order to avoid this, the distance between the insulating tube 6 and the arc extinguishing chamber 2 is increased, and the insulating tube 6 is placed as close to the insulating spacer 8 as possible, in order to ensure insulation separation between the insulating spacer 8 and the insulating tube 6. Another disadvantage is that the position of the insulating spacer 8 must be further moved to the left in the figure, which increases the axial length of the gas tank 12 and requires a large installation space.

The present invention was proposed in order to eliminate the above-mentioned drawbacks, and its purpose is to provide a puffer-type gas circuit breaker with closing resistance that enables a reduction in the number of parts and reduces the installation space. It is in.

[Structure of the Invention] (Means for Solving the Problems) The present invention provides a resistor contact portion in which a closing resistor contact and a closing resistor are connected in series for suppressing overvoltage at the time of closing, and a main contact portion of a circuit breaker. In a puffer-type gas circuit breaker with a closing resistor that is electrically connected in parallel, an insulating spacer and An integrated making resistor support part is provided, and the making resistor is arranged around the outer periphery of the making resistor support part, and the fixed electrode of the main contact and the fixed electrode of the making resistor contact are connected via the making resistor. This feature is characterized in that the two are electrically connected to each other.

(Function) The puffer type gas circuit breaker with a closing resistor of the present invention has a closing resistor support provided on the back surface of the main contact on the fixed electrode side.
Since the closing resistor is arranged, the entire device can be downsized, and by integrally molding the closing resistor support portion with the insulating spacer, it is also possible to reduce the number of parts.

(Example) Hereinafter, an example of the puffer type gas circuit breaker with closing resistance of the present invention will be specifically described based on FIGS. 1 to 3. Incidentally, the same members as those of the conventional type shown in FIG. 4 are given the same reference numerals, and the description thereof will be omitted.

■First Example In this example, as shown in Fig. 1, a cylindrical closing resistance support part 21 is integrally formed in the center of the insulating spacer 20 for gas division, and is connected to the main contact. The main circuit conductor 10 is arranged so as to surround the main circuit conductor 10. Furthermore, a closing resistor 22 is disposed around the outer periphery of the closing resistor support portion 21 . Furthermore, this closing resistor 22 is connected in parallel to the main circuit via the closing resistor contact fixed electrode 3d.

In the puffer type gas circuit breaker with closing resistor of this embodiment having such a configuration, the insulating spacer 20 for gas division is
A closing resistance support part 21 is integrally formed in the main circuit conductor 10, and this closing resistance support part 21 is arranged substantially coaxially with the outer periphery of the main circuit conductor 10.
Furthermore, a closing resistor 22 is provided on the outer periphery of the hakama portion 21 as a closing resistor support.
Since this arrangement eliminates the need for supporting members such as insulating cylinders that were conventionally used to support the closing resistor, the installation space is also eliminated. As a result, the entire circuit breaker can be downsized, and since the closing resistance support part 21 can be formed integrally with the insulating spacer, it is also possible to reduce the number of parts.

In addition, as shown in Fig. 2, the insulating spacer 3 for gas division
0 and the making resistance support part 31 may be constructed from separate members, and the making resistance support part 31 may be attached to the main circuit conductor 10 via the support member 32. In this case as well, the entire device can be downsized, and casting equipment for integrally molding the insulating spacer and the making resistance support part is not required, which is economically advantageous.

Second Embodiment In this embodiment, the present invention is applied to a double-motion puffer type gas circuit breaker, as shown in FIG. That is, an arc extinguishing chamber 2 is housed in a container filled with an insulating gas, and in this arc extinguishing chamber 2, a first movable electrode 40 for a closing resistance contact is coaxially arranged so as to surround a first movable electrode 41 for a main contact. It is also fixed to the operating rod 42 of the first movable electrode 41 for main contact. On the other hand, the second movable electrode 43 for the closing resistance contact is coaxially arranged so as to surround the second movable electrode 44 for the main contact. This second movable electrode 43 for making resistance contact is supported as follows. That is, a cylindrical support member 47 is provided on the back side of the support member 45 that fixes the second movable electrode 44 for main contact with an insulator 46 interposed therebetween.
is fixed, and the second movable electrode 43 for making resistance contact is supported on this support member 47 so as to be slidable in the axial direction.Furthermore, on the back side of the second movable electrode 43 for making resistance contact, A spring 48 is provided. By this return spring 48, the second movable electrode 43 for the closing resistance contact is pushed back by the first movable electrode 40 for the closing resistance contact when closing, and by the biasing force of the return spring 48 when disconnected. It is pressed forward and returns to the frontmost position when the cutoff is completed. Further, on the back surface of the support member 47 of the second movable electrode 43 for the making resistance contact, a cylindrical sliding energizing part 50 for the making resistance contact is provided coaxially so as to surround the sliding energizing part 49 for the main contact. It is being On the other hand, in the insulating spacer 51 for the gas division, a closing resistance support part 52 for supporting the closing resistor 53 is formed, as in the first embodiment, and is arranged so as to surround the main circuit conductor 10. There is.

Furthermore, a closing resistor 53 is disposed on the outside of the closing resistor support portion 52 so as to surround it.

Further, the closing resistor 53 is connected in parallel to the main circuit via the second movable electrode 43 for closing resistance contact.

Note that the closing resistance support portion 52 may be constructed from a separate member from the insulating spacer, as shown in FIG.

In this way, the present invention can also be applied to a double-motion puffer-type gas circuit breaker with closing resistance that has a much faster opening speed and excellent arc-extinguishing performance.

[Effects of the Invention] As described above, according to the present invention, an insulating spacer is integrated with the back surface of the main contact on the fixed electrode side so as to surround the main circuit conductor disposed approximately coaxially with the main contact. A making resistor support part is provided, and a making resistor is disposed around the outer periphery of the making resistor support part, and the fixed electrode of the main contact and the fixed electrode of the making resistor contact are electrically connected via this making resistor. By connecting the two, it is possible to reduce the number of parts and provide a puffer-type gas circuit breaker with a closing resistor that requires less installation space.

[Brief explanation of the drawing]

FIG. 1 is a cross-sectional view showing a first embodiment of a puffer type gas circuit breaker with closing resistance of the present invention, FIG. FIG. 4 is a sectional view showing an example of a conventional puffer type gas circuit breaker with closing resistance. 1... Circuit breaker, 2... Arc extinguishing chamber, 2a... Movable electrode for main contact, 2b... Puffer cylinder, 2C... Insulating nozzle, 2d... Fixed electrode for main contact, 2e ... Insulating tube, 2f... Connection part, 3... Resistance contact part, 3a,
3b... Closing resistor, 3C... Support conductor, 3d...
・Fixed electrode for making resistance contact, 3e... Movable electrode for making resistance contact, 3f... Support conductor, 3g... Spring, 4.
...Movable support, 5゜6...Insulation cylinder, 7...Mechanism box,
8... Insulating spacer, 8a... Connector, 9... Connection conductor, 10... Main circuit conductor, 11... Connection conductor,
12... Gas tank, 20... Insulating spacer, 21
... Closing resistance support part, 22 ... Closing resistor, 30.
... Insulating spacer, 31 ... Closing resistance support part, 32.
... Support member, 40... First movable electrode for making resistance contact, 41... First movable electrode for main contact, 42... Operation rod, 43... Second movable electrode for making resistance contact, 44・
...Second movable electrode for main contact, 45...Support member, 46
... Insulator, 47 ... Supporting member, 48 ... Return spring, 49 ... Sliding current-carrying part for main contact, 50 ...
- Sliding current carrying part for making resistance contact, 51... Insulating spacer, 52... Making resistance support part, 53... Making resistor.

Claims (1)

[Scope of Claims] A resistive contact section that is housed in a tank filled with insulating gas and in which a closing resistor contact and a closing resistor are connected in series to suppress overvoltage during closing, and a main contact section of a circuit breaker. In a puffer type gas circuit breaker with a closing resistor that is electrically connected in parallel, an insulating spacer and An integrated making resistance support part is provided, the making resistor is disposed around the outer periphery of the making resistance support part, and
A puffer-type gas circuit breaker with a closing resistor, characterized in that a fixed electrode of the main contact and a fixed electrode of the closing resistance contact are electrically connected via the closing resistor.