JPH0562023U - Tank type circuit breaker instrument transformer - Google Patents

Abstract

(57) [Summary] [Purpose] When a transformer for instrumentation is attached to the tank type circuit breaker, the purpose is to facilitate investigation of abnormalities in the transformer for instrumentation. [Structure] A branch pipe is installed in the tank that houses the circuit breaker body,
An instrument transformer is attached to the branch pipe via a connecting pipe.
A disconnecting rod is slidably provided inside the connecting pipe, and the sliding of the disconnecting rod allows the transformer for a meter to be connected to or disconnected from the breaker side.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to an instrument transformer attached to a tank type circuit breaker.

[0002]

[Prior Art]

 In a tank type circuit breaker such as a gas type or a vacuum type, a pair of branch pipes is provided above the tank that houses the circuit breaker body, and a disconnector and a grounding device are installed inside one of the branch pipes. A configuration in which a transformer for a meter is provided on the branch pipe through a connecting pipe has been separately proposed by the present inventor (Japanese Patent Application No. 2-75838).

FIG. 5 shows the already proposed structure, and reference numeral 1 is a tank in which a vacuum or an insulating gas is contained, in which a circuit breaker body S (see FIG. 6) is housed. .. A pair of branch pipes 2 on the power supply side and the load side are provided above the tank 1, and a bushing-type current transformer 3 is installed above each branch pipe. A bushing 4 is provided on the upper part. A main circuit terminal 5 is provided at the upper end of the bushing 4.

A disconnector 6 and a grounding device E (see FIG. 6) are housed inside the branch pipe 2 on the power supply side. Reference numeral 7 is a fixed contactor of the disconnector 6, and 8 is a movable contactor of the same, which is operated from the outside to make contact with and separate from the fixed contactor 6. The tank 1, the branch pipe 2, the bushing 4 and the like are prepared for each phase and arranged in parallel with each other.

A connecting pipe 9 containing an insulating gas therein is connected to the branch pipe 2 on the power source side, and an instrument transformer 10 is attached to the connecting pipe 9. Inside the connecting pipe 9, there is a conductor 11 connected to the disconnector 6, and this conductor 11 is connected to an instrument transformer 10.

By the way, in this already proposed configuration, the main circuit (primary side) of the instrument transformer 10 remains fixedly connected to the disconnector 6 by the conductor 11. Therefore, when an abnormality occurs in the equipment, it is impossible to disconnect the instrument transformer 10 from the circuit breaker side in order to identify the abnormal portion. Therefore, it is investigated whether the instrument transformer 10 has an abnormality cause. There is a drawback that cannot be done.

[0007]

[Problems to be solved by the device]

 According to the present invention, a branch pipe is provided in a tank for accommodating a main body of a circuit breaker, and a disconnecting switch and a tank type circuit breaker for accommodating a grounding device are provided with a transformer for a meter, and a transformer for the meter is provided. The purpose is to make it possible to easily investigate abnormalities in vessels.

[0008]

[Means for Solving the Problems]

 The present invention relates to a tank type circuit breaker in which a branch pipe is provided in a tank for accommodating a main body of a circuit breaker, and a disconnecting switch and a grounding device are accommodated in the branch pipe. A conductor connected to the circuit breaker side is installed inside the branch pipe inside the connecting pipe, and a disconnecting rod that slides with respect to this conductor via a sliding contact is attached. It is characterized in that it can be opened and closed by sliding with respect to the main terminal of the instrument transformer, and that this disconnect rod can be driven from outside the connecting pipe.

[0009]

[Action]

 Normally, the main terminal of the instrument transformer is connected to the circuit breaker via a conductor and a disconnecting rod. If it becomes necessary to disconnect the instrument transformer, operate the disconnect rod from outside the connecting pipe and slide it against the conductor to disconnect the tip of the disconnect rod from the main terminal of the instrument transformer. Let Due to this opening, the instrument transformer is separated from the circuit breaker side.

[0010]

【Example】

 An embodiment of the present invention will be described with reference to the drawings. In addition, the same reference numerals as those in FIG. 5 indicate the same or corresponding parts. According to the present invention, the conductor 12 is installed inside the connecting pipe 9 connected to the branch pipe 2 so as to penetrate the insulating spacer 11. The conductor 12 is connected to the conductor 13 connected to the breaker side (disconnector 6). An insulating gas is hermetically housed inside the connecting pipe 9.

A disconnecting rod 14 slidably penetrates through the conductor 12 and is electrically connected to the conductor 12 through a sliding contact 15. A disconnecting portion D is constituted by the tip of the disconnecting rod 14 and the main terminal 16 of the voltage transformer 10 for an instrument. Specifically, the tip of the disconnecting rod 14 slides with respect to the sliding contact 17 provided on the main terminal 16 so that the tip of the disconnecting rod 14 contacts and separates.

The disconnecting rod 14 is slidably driven from the outside of the connecting pipe 9. Therefore, a slide rod 19 is connected to the end of the disconnecting rod 14 via an insulating rod 18, and the tip of this slide rod 19 is led out from the end plate 20 of the connecting pipe 9. In order to maintain the airtightness of the lead-out portion, the slide rod 19 penetrates the closing plate 22 fixed to the end plate 20 by the bolt 21, and the O-ring 23 is provided in the penetrating portion of the closing plate 22.

A cover 24 is detachably attached to the end plate 20 with a bolt 25 in order to protect the tip of the slide rod 19 led out from the closing plate 22 from wind and snow. 26 is an O-ring.

FIG. 1 shows a steady state, in which the tip of the disconnecting rod 14 is connected to the main terminal 16 of the instrument transformer 10 via a sliding contact 17. That is, the disconnection portion D is in the closed state. Therefore, the instrument transformer 10 is connected to the circuit breaker side, that is, the disconnector 6 via the disconnector rod 14 and the conductors 12 and 13.

When it is necessary to disconnect the instrument transformer 10 from the circuit breaker side, the bolt 25 is loosened, the cover 24 is removed, and the tip of the slide rod 19 is pulled up. As a result, the disconnecting rod 14 is pulled up via the insulating rod 19, its tip is separated from the main terminal 16, and the disconnecting portion D is opened. FIG. 2 shows the state. As a result, the voltage transformer 10 is disconnected from the circuit breaker side.

By storing the insulating gas in the connecting pipe 9, the disconnection rod 14 can be opened even in a live state. Therefore, even if the disconnection rod 14 is used for disconnection, the circuit breaker, disconnector, etc. can continue to operate.

The disconnection of the instrument transformer 10 can be used not only for the abnormality inspection but also for the maintenance inspection and the measurement of the insulation resistance of the instrument transformer.

[0018]

[Effect of the device]

 As described above, according to the present invention, when a transformer for a meter is attached to a tank type circuit breaker, it is extremely easy not only to investigate the abnormality of the transformer for a meter but also to perform maintenance inspection and measurement of insulation resistance. There is an effect that can be achieved.

[Brief description of drawings]

FIG. 1 is a front view showing an embodiment of the present invention.

FIG. 2 is a front view showing the disconnection state of FIG.

FIG. 3 is a front view showing the overall configuration of the present invention.

FIG. 4 is a single-line connection diagram showing the connection relationship of the configuration shown in FIG.

FIG. 5 is a front view of a conventional example.

FIG. 6 is a single-line connection diagram showing the connection relationship of the configuration shown in FIG.

[Explanation of symbols]

 1 tank 2 branch pipe 6 disconnecting device E grounding device 9 connecting pipe 10 instrument transformer 12 conductor 14 disconnecting rod D disconnecting portion 18 insulating rod 19 slide rod

Claims (1)

[Scope of utility model registration request] 1. A tank type circuit breaker in which a branch pipe is provided in a tank for accommodating a circuit breaker main body, and a disconnecting switch and a grounding device are accommodated in the branch pipe. Attaching a device, inside the connecting pipe, a conductor connected to the circuit breaker side is installed inside the branch pipe, and a disconnecting rod that slides with respect to the conductor through a sliding contact, A disconnecting section is constituted by the main terminal of the instrument transformer, and the disconnecting section is opened and closed by sliding the disconnecting section with respect to the main terminal so that the disconnecting section can be driven from the outside of the connecting pipe. Narutanu type circuit breaker instrument transformer.