JPH08743Y2 - Tank type circuit breaker instrument transformer - Google Patents

Description

[Detailed description of the device]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an instrument transformer attached to a tank type circuit breaker.

[0002]

2. Description of the Related Art In a tank type circuit breaker such as a gas type or a vacuum type, a pair of branch pipes are provided above a tank for accommodating a main body of the circuit breaker, and one of the branch pipes has a disconnecting switch and a grounding device. A configuration in which a transformer for an instrument is installed on the branch pipe via a connecting pipe has been separately proposed by the present inventor (Japanese Patent Application No. 2-75838).

FIG. 5 shows the structure already proposed, and reference numeral 1 denotes a tank which is evacuated or contains an insulating gas, in which a circuit breaker main 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 on 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 source side. 7 is a disconnector 6
The fixed contactor 8 is a movable contactor, 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.
Are connected to the instrument transformer 10.

[0006] By the way, in this proposed structure, the main circuit (primary side) of the voltage transformer 10 is disconnected by the conductor 6 by the conductor 11.
It remains fixedly connected to. Therefore, when an abnormality occurs in the equipment, it is not possible to disconnect the instrument transformer 10 from the circuit breaker side in order to identify the abnormal portion. Therefore, investigate whether the instrument transformer 10 has an abnormality cause. There is a drawback that you cannot do.

[0007]

SUMMARY OF THE INVENTION According to the present invention, a tank for accommodating a circuit breaker main body is provided with a branch pipe, and a disconnecting switch and a grounding device are accommodated inside the tank type circuit breaker, and a transformer for an instrument is provided. The purpose is to facilitate the investigation of anomalies in the attached Yang and its instrument transformers.

[0008]

The present invention provides 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 disconnector and a grounding device are accommodated in the branch pipe. A transformer for a meter is attached through a connecting pipe, and a conductor connected to the circuit breaker side inside the branch pipe is installed inside the connecting pipe, and a sliding contact is provided to the conductor. It is characterized in that the disconnecting rod that slides by sliding can be opened and closed by sliding with respect to the main terminal of the instrument transformer, and the disconnecting rod can be driven from the outside of the connecting pipe.

[0009]

The main terminal of the instrument transformer is normally connected to the circuit breaker via the conductor and the disconnecting rod. When it becomes necessary to disconnect the instrument transformer, operate the disconnect rod from the outside of the connecting pipe and slide it against the conductor to separate the tip of the disconnect rod from the main terminal of the instrument transformer. . This disconnection causes the instrument transformer to be separated from the breaker side.

[0010]

Embodiments 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 portions. According to the present invention, the conductor 12 is inserted through the insulating spacer 11 inside the connecting pipe 9 connected to the branch pipe 2.
Is installed. The conductor 12 is connected to the conductor 13 which is connected to the circuit breaker side (disconnector 6). An insulating gas is hermetically stored inside the connecting pipe 9.

Reference numeral 14 denotes a disconnecting rod which slidably penetrates through the conductor 12 and is electrically connected to the conductor 12 through a sliding contact 15. A disconnecting portion D is formed by the tip of the disconnecting rod 14 and the main terminal 16 of the instrument transformer 10. Specifically, the tip of the disconnecting rod 14 slides with respect to the sliding contact 17 provided on the main terminal 16, and the disconnecting rod 1
The tip of 4 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 this outlet,
Closing plate 2 fixed to end plate 20 by bolts 21
The slide rod 19 penetrates through 2, and the O-ring 23 is provided in the penetrating portion of the closing plate 22.

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

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

When it is necessary to separate 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 instrument transformer 10 is disconnected from the breaker side.

Since the connecting gas is contained in the connecting pipe 9, the disconnection rod 14 can be opened even in a live state. Therefore, even if the disconnection bar 14 is used for disconnection,
Circuit breakers, disconnectors, 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]

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

[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 a 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, and a transformer for an instrument is connected to the branch pipe through a connecting pipe. Attaching a container, inside the connecting pipe, a conductor connected to the circuit breaker side inside the branch pipe is installed, and a disconnecting rod that slides with respect to the conductor via a sliding contact, A disconnecting portion is configured with the main terminal of the instrument transformer, and the disconnecting rod is driven from the outside of the connecting pipe so that the disconnecting portion is opened and closed by sliding of the disconnecting rod with respect to the main terminal. Narutanu type circuit breaker instrument transformer.