JPH0618447B2 - Combined gas circuit breaker - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION Object of the Invention (Industrial field of use) The present invention stores three-phase blocking parts in one tank, and both ends of the blocking part are provided in the same tank. The present invention relates to a composite gas circuit breaker that is also provided with a work grounding device to be connected.

(Prior Art) In recent years, there has been a strong demand for gas-insulated switchgear to be easy to maintain and inspect, and to minimize damage in the event of an accident. At the same time, there is a continuous need to reduce the installation area. Needs still exist. To meet these demands,
A composite gas-insulated switchgear has been introduced, which is configured by housing several components constituting the gas-insulated switchgear in the same metal container. There is a compound gas circuit breaker in which the inner circuit breaker and the work grounding device are housed in the same container. This compound gas circuit breaker is incorporated in the compound gas insulated switchgear shown in the single wire connection diagram in FIG. There are many cases.

FIG. 7 is a single line connection diagram showing one line of a composite type gas insulated switchgear adopting a general double bus system. In FIG. 7, one pole side of the circuit breaker CB is connected to the cable connecting portion CH via the line disconnector DS ₃ and the line grounding device ES ₂ . Further, the other pole side of the circuit breaker CB is connected to the main bus lines BUS ₁ and BUS ₂ via the main bus line disconnecting switches DS ₁ and DS ₂ , respectively, and the work grounding device ES is connected to both pole sides of the circuit breaker CB. ₁ and E
Connecting the S _2.

In the composite type gas insulated switchgear having such a circuit configuration, the composite type gas circuit breaker stores the three-phase circuit breaker of the circuit breaker CB and the work grounding devices ES ₁ and ES ₂ in the same tank. It is configured with.

(Problems to be Solved by the Invention) In the double-bus type gas-insulated switchgear shown in FIG. 7, when the bus-side device, for example, the bus-bar disconnector DS ₁ fails, the circuit breaker CB and the circuit breaker CB are sound. Busbar disconnector D on one side
With opened S _2, it is necessary to repair the disconnecting switch DS ₁ that the failure After a power failure on one side bus BUS _1.
For this reason, it was necessary to cut the power of the bus BUS ₁ on one side and this line for a long time.

In addition, since the work grounding devices ES ₁ and ES ₂ are usually placed above and below in the tank of the circuit breaker, this grounding mechanism is led out of the tank by the upper and lower rotary seals and operated by levers and links. It is an operating force transmission mechanism connected to the box. For this reason, the seal portion and the connecting portion are separately arranged above and below the tank, and a large driving force is required for the manual opening / closing operation.

An object of the present invention is to provide a composite gas circuit breaker which has a simple structure and exhibits excellent operability and recovery in the event of an accident without increasing the installation area of the entire gas insulated switchgear.

[Structure of the Invention] (Means and Actions for Solving Problems) A composite gas circuit breaker according to the present invention is electrically connected to a three-phase circuit breaker and both sides of the circuit breaker in a circuit breaker tank. In a gas circuit breaker in which a work grounding device is arranged, it is possible to electrically connect or disconnect the current-carrying conductor, which connects the three-phase circuit breaker arranged in the circuit breaker tank and the main bus bar, as necessary. The detachable conductor is provided, and further, a manhole for taking out or taking in the detachable conductor is provided at a position facing the detachable conductor of the circuit breaker tank.

According to the present invention, it is possible to easily attach and detach the detachable conductor from the inspection manhole when the busbar disconnector or the like is out of order, and it is possible to significantly shorten the recovery time from an accident.

(Examples) The present invention will be described below with reference to examples shown in FIGS. 1 and 2. Referring to FIG. 1, a compound gas circuit breaker CB according to the present invention includes a three-phase breaker 1 and two work grounding devices ES ₁ and ES ₂ in an upright sealed tank 10 in the upper part of the tank 1. It is configured by placing them all together. That is, the working grounding device ES ₁ extends from one pole side of the breaking portion 1 to face the conducting conductor 2, and the working grounding device ES ₂ extends from the other pole side of the breaker 1. Are located opposite to.

Further, the main bus BUS is connected to the current-carrying conductor 2 on the bus bar side of the breaking portion 1.
₁ and BUS ₂ are connected via busbar disconnectors DS ₁ and DS ₂ , respectively, and the conductor 3 on the line side of the breaking unit 1 is a universal expansion joint M and a line disconnector as shown in FIG. The device DS ₃ and the grounding device ES ₃ are connected to the cable connection CH via the respective internal through conductors.

Therefore, in the composite gas circuit breaker CB according to the present invention, the bus-side current-carrying conductor 2 and each main bus BUS ₁ and BU.
As shown in FIG. 4, the detachable conductor 4 is attached to the connection portion of S _{2 with} the conductor.
The feature is that a and 4b are provided. The detachable conductors 4a and 4b are hollow conductors having a window 5 as shown in FIG. 5, and can be connected or disconnected by detaching a bolt 6 from the window 5. Further, in order to perform attachment / detachment work to / from the attachable / detachable conductors 4a and 4b as necessary, the side face facing the connection portion between the busbar side energizing conductor 2 of the sealed tank 10 and each of the main busbars BUS ₁ and BUS ₂ is provided. An inspection manhole 7 shown by a dotted line in FIG. 1 is provided. The attachment / detachment work of the detachable conductors 4a and 4b can be easily performed from the inspection manhole 7 through the window 5 of the hollow conductor.

Further, in the embodiment shown in FIG. 1, the work grounding devices ES ₁ and ES ₂ provided with the breaker portion 1 of the breaker CB sandwiched therebetween face the bus-side conducting conductor 2 and the line-side conducting conductor 3, respectively. However, the space above the tank 10 is used. This work grounding device E
According to the arrangement structure of S ₁ and ES ₂ , the operation force from the operation box 8 provided on the outer side surface of the tank 10 is transmitted upward by the link 9 and the inside of the tank 10 is transmitted from the lever 11 via the rotary rail portion 12. Lever located on both sides of the tank, which is located inside the tank 10.
It is transmitted to both work grounding devices ES ₁ and ES ₂ via 13a and 13b.

In this structure, the levers 13a and 13b on both sides can be provided in the gas in the sealed tank 10 to eliminate the influence of the atmosphere, and the rotary seal portion 12 can be reduced to one location. The operating force of the manual handle provided in the box 8 can be saved and the operation can be easily performed.

Next, in the composite type gas circuit breaker CB according to the present invention, the bus-side disconnector DS in FIG. 1, FIG. 3 and FIG.
_{If 1} fails, the circuit breaker CB and the remaining disconnector DS
₂ and are opened, and the main buses BUS ₁ and BUS ₂ are cut off. After that, the detachable conductor 4a on the main bus line BUS ₁ side is disassembled and removed from the inspection manhole 7, and the space in that portion is used as a simple disconnection portion. The after removal of the detachable conductors 4a was charged disconnecting switch DS _2, and the circuit breaker CB, one side of the main bus BUS
Charge ₂ and make use of this line. After that, by repairing the fault disconnecting switch DS ₁ , the rotation stop time can be shortened.

Further, in another embodiment of the present invention shown in FIG. 6, outlet cylinder portions 14a, 14b are provided on the main bus side of the closed tank 10 of the circuit breaker CB.
And a connection conductor 15 between the current-carrying conductor 2 of the circuit breaker CB and the two main buses BUS ₁ and BUS ₂ that pass through the outlet cylinder portions 14a and 14b.
A detachable conductors 4a and 4b are provided on a and 15b, respectively.
In addition, in order to take out the detachable conductors 4a and 4b, the outlet tube portion 14
The feature is that handballs 16a and 16b are provided on a and 14b.

Also in the embodiment shown in FIG. 6, when the busbar disconnector fails, by removing the detachable conductor 4a or 4b, the work procedure for emergency recovery can be simplified and the recovery time at the time of failure can be shortened. You can

[Effects of the Invention] As described above, in the present invention, by providing a simple attachment / detachment device in the sealed tank of the circuit breaker, recovery work in the event of an accident can be performed easily and quickly. Further, since the busbar attaching / detaching device is not provided between the circuit breaker and the main busbar, this contributes to the reduction of the entire configuration.

[Brief description of drawings]

FIG. 1 is a front view showing an embodiment of the composite gas circuit breaker of the present invention cut away, FIG. 2 is a rear view of FIG. 1, and FIG. 3 is a composite gas circuit breaker of the present invention. FIG. 4 is an overall configuration diagram showing a gas-insulated switchgear, FIG. 4 is a plan view showing a detachable conductor mounting portion used in the present invention, and FIGS. 5A and 5B are front views and plan views showing detachable conductors used in the present invention. FIG. 6 is a vertical sectional front view showing another embodiment of the present invention, and FIG. 7 is a single wire connection diagram showing a general gas insulated switchgear. 1 …… Three-phase breaker 2 …… Bus side conducting conductor 3 …… Line side conducting conductor 4 …… Detachable conductor 7 …… Inspection manhole 8 …… Operation box 9 …… Link 11, 13 …… Lever 12 …… Rotational seal part 14 …… Leading tube part 16 …… Handball BUS ₁ , BUS ₂ …… Main busbar DS ₁ , DS ₂ , DS ₃ ...... Disconnector CB …… Breaker ES ₁ , ES ₂ …… Work grounding apparatus

Claims (4)

[Claims] 1. A double busbar type gas circuit breaker in which a three-phase circuit breaker and a work grounding device electrically connected to both sides of the circuit breaker are arranged in the circuit breaker tank. A detachable conductor that is electrically connectable or separable is provided to the current-carrying conductor that connects the three-phase interrupter and the main bus bar disposed inside, and the detachable conductor is further provided at a position facing the detachable conductor of the circuit breaker tank. A composite gas circuit breaker having a hole for taking out or taking in a detachable conductor. 2. The composite gas circuit breaker according to claim 1, wherein the hole portion is an inspection manhole formed on a side surface of the circuit breaker. 3. A detachable conductor is provided on a current-carrying conductor passing through a lead-out tube portion on a side of a circuit breaker tank, and the hole portion provided at a position facing the current-carrying conductor on the lead-out tube portion is a hand hole. The composite gas circuit breaker according to claim 1, wherein 4. A pair of the work grounding devices are provided, and both of the work grounding devices are arranged on substantially the same plane above the breaker tank, and a driving force for both work grounding devices is provided at one place from the operation box. The composite gas circuit breaker according to claim 1, wherein the rotary gas seal is configured to be transmitted through the rotary seal.