JPH0743981B2 - Tank type gas insulation with resistance and circuit breaker - Google Patents

Description

Description: TECHNICAL FIELD OF THE INVENTION The present invention relates to a tank-type gas-insulated circuit breaker with a resistor provided with a resistance contact portion for suppressing overvoltage during switching.

[Technical background of the invention] In a circuit breaker installed in a high voltage substation of a system of 500 KV in Japan and a system of 345 KV or more in foreign countries, in order to suppress overvoltage at the time of opening and closing the circuit breaker due to insulation coordination. The resistance input method or resistance cutoff method is required.
Of these methods, the commonly used method is the resistance closing method.This method uses a resistance contact part formed by connecting a resistance contact and a resistor in series and a main contact breaking part in parallel. To connect.

FIG. 2 shows an example of a tank-type gas-insulated circuit breaker with a resistor constructed in the above manner.

In FIG. 2, reference numeral 1 is a metal tank in which an insulating gas is sealed, and a main contact breaking portion 2, a resistance contact 3 and a resistor 4 are provided inside.
Is stored. The operation mechanism 5 is placed under the tank 1 and drives the movable contactors of the main contact breaking portion 2 and the resistance contact 3 by the link and the lever 7 via the insulating rod 6. Reference numeral 8 denotes a conductor that electrically forms a circuit with the outside of the breaker, and an insulating bushing or the like is provided on the upper part of the nozzle 9.

[Problems of the background art] By the way, in the substation, the resistance input method as described above is actually required only for the circuit breaker, not for the busbar connection or the transformer circuit breaker. Therefore, at the same substation, two types of tank-type gas-insulated circuit breakers with resistance and gas-insulated circuit breakers that do not require a resistance injection method will be used.

Therefore, a separate process is required to manufacture each circuit breaker, which causes a problem of high cost.

In particular, in the tank-type gas-insulated circuit breaker with resistance, the structure of the other parts is almost the same as that of the gas-insulated circuit breaker that does not require the resistance injection method, except for the resistor and the resistance contact. It is extremely wasteful to manufacture the sol in separate steps.

[Object of the Invention] The present invention has been proposed in order to solve the drawbacks of the prior art as described above, and an object thereof is to make the resistance contact part easily attachable to and detachable from the main contact breaking part. By configuring it as a circuit breaker that does not require
It is an object of the present invention to provide a tank-type gas-insulated circuit breaker with a resistance that eliminates waste of the manufacturing process and improves economy.

[Outline of the Invention] A tank-type gas insulated circuit breaker with a resistance according to the present invention is provided with a tank for accommodating a main contact breaking section and a tank for accommodating a resistance contact section separately, and a movable shaft of the main contact breaking section and an operating mechanism. The drive shaft is connected in a substantially straight line, and the movable shaft of the resistance contact portion is connected to the connecting portion via a transmission means. The tank containing the main contact breaking portion is supported by the supporting legs, and the tank containing the resistance contact portion is connected to the lower portion of the tank.

With such a configuration, the tank for accommodating the resistance contact portion and the transmission means for transmitting the driving force to the resistance contact portion can be easily removed from the main contact cutting portion side, respectively, so that the resistance contact portion is unnecessary. It can also be used as a circuit breaker.

[Embodiment of the Invention] Hereinafter, the present invention will be described with reference to a position embodiment shown in FIG. The same parts as those shown in FIG. 2 are designated by the same reference numerals and the description thereof will be appropriately omitted.

Reference numeral 10 in the drawing denotes a first tank which accommodates the main contact cutoff portion 2 and which is filled with an insulating gas such as SF ₆ gas. The main contact cutoff portion 2 is supported by an insulating support 22 from one end of the tank 10. At the same time, it is driven in the horizontal direction by the operating mechanism 5 arranged outside the same end. Reference numeral 23 in the figure is a second tank that houses the resistance contact 3 and the resistor 4, and is arranged under the first tank 10 and has two openings 24, 25 with the first tank 10. The insulating gas is in communication with. The resistance contact 3 is supported by the insulating support 26 from one end of the second tank 23, and the tank of the main contact cutoff portion 2 is supported.
It is arranged in the same direction as the arrangement in 10 and is driven by the operating mechanism 5. The resistor 4 is supported on the other end side of the second tank 23 by an insulating support 27, and optionally a cover plate of an opening 28 provided on the side surface of the tank by another insulating support not shown.

In the figure, 29 and 30 are rod-shaped or tubular contacts, which are respectively inserted into contact seats 31, 32, 33 and 34 in which springs and finger-shaped contacts are provided and which are connected to the movable contacts of the main contact breaking unit 2. The movable contact side of the resistance contact 3 and the fixed contact side of the main contact cutoff portion 2 are electrically connected to the opposite side 4 of the resistance contact of the resistor 4. In the figure, reference numeral 35 denotes a rod-shaped or tubular contactor fixed to the resistance contact side end portion 36 of the resistor 4, which is the resistance contact side end portion 37 of the resistance contact 3.
And is inserted into a contact seat 38 having a spring and a contact therein, and electrically connects the resistance contact 3 and the resistance body 4. In the figure, 39 is a foot attached to the tank 10. Reference numeral 40 in the figure denotes a conductor, which forms an electrical circuit with the outside of the circuit breaker through a bushing or the like arranged above the flange 41.

Reference numeral 42 in the drawing denotes a third tank, which accommodates a connecting portion 44 that mechanically connects the operating mechanism 5 and the operating rod 43 provided on the movable contact member side of the main contact breaking portion 2 and communicates with the tank 10. ing. In the figure, reference numeral 45 denotes a fourth tank, which communicates with the second tank 23, and further through the tubular tank portion 46, the third tank 42.
It also communicates with. The connecting portion 44 is provided so that the drive shaft of the operating piston 47 of the operating mechanism 5 and the movable shaft of the circuit breaker 2 are substantially in a straight line. And the resistance contact 3 is driven in response to the operation of the main contact breaking portion 2. 52 in the figure is a storage box for the operation mechanism,
Components other than the operating mechanism are omitted. Reference numeral 53 in the drawing denotes an opening provided in the third tank 42.

As described above, according to this embodiment, among the circuit breakers installed in the same substation, when the circuit breaker is used as a tank type gas insulated circuit breaker with resistance, the flange of
A current transformer and a bushing may be attached to the upper part of 41, and when used as a gas-insulated breaker without resistance, the second tank 23 and conductors 29, 30 including the inside are removed, and the opening 24 A lid is attached to the opening on the side of the first tank 10 corresponding to the second tank 25, and the lever 48, the rod 49, the tubular tank portion 46, and the fourth tank 45 are removed, and the third tank
It suffices if the current transformer and the bushing are attached to the upper portion of the flange 41 in such a structure that a lid is attached to the opening 53 of 42, and two types of tank-type gas insulation breakers can be easily provided.
Further, since the manufacturing process can be integrated into one system, there is no waste and cost reduction can be realized.

In the above description, the breaker having a structure to which the bushing is attached has been described, but the present invention is not limited to this, and can be applied to a breaker for a gas insulated switchgear, and the effect is exactly the same. In this case, for example, the flange 41 of FIG.
From the above part, it may be connected to another device through a gas line.
Further, the flange 41 in FIG. 1 is attached so as to be inclined with respect to the central axis of the first tank 10, but it may be arranged so as to be parallel, or it may be attached not to the upper portion of the tank but to the side surface. It is conceivable that the one conductor lead-out portion may be provided in the cover plate portion of the first tank 10 in the central axis direction. In this case, the gas can be separated from the outside of the breaker with an insulating spencer.

Further, as in the present invention, when the main contact breaking portion and the resistance contact portion are housed in different tanks and the resistance contact is driven from outside the tank, even if the main contact breaking portion becomes multi-point cut, one resistance contact is provided. Can be

In addition, according to the present invention, as for the transmission means for transmitting the driving force to the movable shaft on the side of the resistance contact portion, it is not always necessary to dispose the transmission means in the insulating gas, and therefore, the fourth tank and the tubular tank portion. Is not always necessary, and can be omitted for the third tank. On the other hand, the third and fourth
It is also possible to provide alternative tank configurations corresponding to the tank and the tubular tank section.

[Effects of the Invention] As described above, according to the present invention, a circuit breaker having the same rated voltage in the same substation can be used with or without a resistor without increasing the size of the device. It is possible to provide a tank-type gas-insulated circuit breaker with resistance that is economical and has no waste.

[Brief description of drawings]

FIG. 1 is a sectional view showing an embodiment of a tank type gas insulation breaker with resistance according to the present invention, and FIG. 2 is a sectional view showing an example of a conventional tank type gas insulation breaker with a resistance. 2 ... Main contact cutoff part, 3 ... Resistance contact, 4 ... Resistor, 5 ... Operating mechanism, 10 ... First tank, 23 ... Second
Tank, 24,25,53 …… opening, 42 …… third tank,
43,51 …… Operation rod, 44 …… Coupling part, 45 …… Fourth tank, 46 …… Tubular tank part, 48,50 …… Lever, 49 ……
rod.

Claims (3)

[Claims] 1. A circuit breaker body composed of a resistance contact portion in which a resistance contact and a resistor are connected in series and a main contact breaking portion are connected in parallel, and is housed in a tank filled with an insulating gas. In a tank-type gas insulated circuit breaker, the tank contains a first tank which houses the main contact breaking section and is supported by a supporting leg, and a resistance contact section which is connected to a lower portion of the first tank. An operation mechanism that is divided into a second tank and drives the main contact breaking portion is arranged at a longitudinal end portion of the first tank, and the main contact breaking portion is arranged from the longitudinal end portion of the first tank. Of the movable mechanism is extended, and the movable shaft and the drive shaft of the operating mechanism are connected by a connecting portion so as to form a substantially straight line, and the connecting portion and the movable shaft of the resistance contact portion are connected via a transmission means. Tank type with resistance characterized by being connected together Gas insulation breaker. 2. The tank-type gas insulated circuit breaker with resistance according to claim 1, wherein the drive shaft, the connecting portion and the transmitting means are arranged in an insulating gas. 3. The transmission means comprises a third tank communicating with the first tank, a fourth tank communicating with the second tank, and a tubular tank communicating the third and fourth tanks with each other. The tank-type gas insulated circuit breaker with a resistance according to claim 1, which is housed in a transmission tank section consisting of.