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Gas circuit breaker

A gas circuit breaker, gas technology, applied in the direction of high-voltage air circuit breakers, circuits, electrical components, etc.

Pending Publication Date: 2021-08-31
KK TOSHIBA +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, since the voltage of the power system is a high voltage, the arc current continues to flow even after the pair of electrodes are mechanically separated.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

no. 1 Embodiment approach

[0037] [1-1. Outline structure]

[0038] As follows, while referring to Figure 1 to Figure 9 The overall structure of the gas circuit breaker 1 of this embodiment will be described. figure 1 The internal structure when the gas circuit breaker 1 is in a closed state is shown.

[0039] The gas circuit breaker 1 has a first fixed contact part 2 (hereinafter collectively referred to as "fixed contact part 2"), a movable contact part 3, and a second fixed contact part 4 (hereinafter collectively referred to as "fixed contact part 2"). 4"), airtight container 8. The lead-out conductor 7 a is connected to the fixed contact part 2 and the lead-out conductor 7 b is connected to the fixed contact part 4 via the airtight container 8 . The lead-out conductors 7a, 7b are connected to the power system. The gas circuit breaker 1 is installed in a power supply facility such as a substation.

[0040] The fixed contact part 2 and the fixed contact part 4 are cylindrical members made of co...

no. 2 Embodiment approach

[0270] [2-1. Structure and function]

[0271] The gas circuit breaker 1 of this embodiment is characterized in that, in addition to the first embodiment, the air cylinder 42 has a check valve 42e. Other structures are the same as those of the first embodiment. while referring to Figure 10The structure and operation of the gas circuit breaker 1 of this embodiment will be described. The check valve 42e closes the circuit between the compression chamber 36 and the accumulator flow path 38 when the pressure of the arc extinguishing gas in the compression chamber 36 is equal to or higher than a predetermined value.

[0272] In the current interruption state, the arc extinguishing gas is compressed in the compression chamber 36 constituted by the piston 33 and the cylinder 42 . Compression of the arc extinguishing gas generates a force in the compression chamber 36 that prevents pressure increase, that is, a force that causes the piston 33 to move backward toward the open end. ...

no. 3 Embodiment approach

[0281] [3-1. Structure and function]

[0282] The gas circuit breaker 1 of the present embodiment is characterized in that, in addition to the first embodiment or the second embodiment, the piston supporting portion 33a has a small diameter portion 33b formed to have a small diameter. Other configurations are the same as those of the first embodiment or the second embodiment. while referring to Figure 11 , Figure 12 The structure and operation of the gas circuit breaker 1 of this embodiment will be described.

[0283] The piston 33 is driven by a columnar piston support portion 33a inserted into the insertion hole 42a provided on the support body 43, and the piston support portion 33a has a small diameter formed on a part of the columnar piston 33 side. By driving the piston supporting portion 33a, the small-diameter portion 33b of the small-diameter portion 33b flows out of the arc-extinguishing gas from the gap portion 71 formed between the small-diameter portion 33b an...

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PUM

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Abstract

Provided is a gas circuit breaker with which it is possible to adequately secure density and pressure of an arc-extinguishing gas sprayed onto an arc, and improve the reliability of maintaining electrical insulation performance. The gas circuit breaker 1 has: a first arc contactor 21 electrically connected to a first lead-out conductor 7a; a cylindrical guide part 41 provided on the second lead-out conductor 7b side; a trigger electrode 31, which is disposed so as to be movable between the first arc contactor 21 and the guide part 41, and which, during the first half of current breaking, fires an arc between the trigger electrode 31 and the first arc contactor 21 via movement; a compression chamber 36 for raising the pressure of an arc-extinguishing gas, the compression chamber 36 comprising a cylinder 42, which has a cylindrically formed outer wall 51 and inner wall 52 and which is provided on the guide part 41 side, and a piston 33, which slides between the outer wall 51 and the inner wall 52 in coordination with the trigger electrode 31; and an insulating nozzle 23 for guiding the arc-extinguishing gas, in which the pressure has been raised by the compression chamber 36, to the arc fired by the first arc contactor 21. The insulating nozzle 23 is formed so as to be integral with the inner wall 52 of the cylinder 42.

Description

technical field [0001] This embodiment relates to a gas circuit breaker for breaking a current in an electric power system. Background technique [0002] A gas circuit breaker is used to interrupt the current flowing in the power supply line of the electric power system. The gas circuit breaker is arranged in the power supply line in order to interrupt the current flowing when the system in which the failure occurred is disconnected in the case of a system failure. [0003] As a gas circuit breaker as described above, a buffer type gas circuit breaker has been widely used. The buffer type gas circuit breaker has a pair of electrodes arranged opposite to each other in a closed container filled with arc extinguishing gas. The pair of electrodes is opened and closed by being driven by a driving device arranged outside the gas circuit breaker. [0004] When the gas circuit breaker is in an open state, the pair of electrodes are driven by a driving device arranged outside the ...

Claims

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Application Information

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IPC IPC(8): H01H33/915
CPCH01H33/7023H01H33/91H01H2033/908
Inventor 今泽优子吉野智之内井敏之石井嵩人岛村旭长谷川朋宽
Owner KK TOSHIBA