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Devices for on-line monitoring of medium and high voltage circuit breakers

A circuit breaker and equipment technology, applied in the field of contact ablation, can solve the problem that circuit breaker analysis cannot be performed online

Active Publication Date: 2018-04-24
HITACHI ENERGY SWITZERLAND AG
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, analysis of circuit breakers cannot be performed online because both contacts of the circuit breaker must be grounded to perform the measurement

Method used

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  • Devices for on-line monitoring of medium and high voltage circuit breakers
  • Devices for on-line monitoring of medium and high voltage circuit breakers
  • Devices for on-line monitoring of medium and high voltage circuit breakers

Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0046] figure 1 A medium voltage system 1 is schematically shown with a generator circuit breaker 2 which couples a medium voltage power supply 3 provided by, for example, a generator of a power plant or similar source, to a power receiver 4 (such as a converter, load, power grid, etc.). The circuit breaker 2 is represented here with an optional surrounding metal case connected to ground. Furthermore, a device 5 for monitoring the ablation level of the circuit breaker 2 is provided.

[0047] The cross-section of the interrupting chamber of circuit breaker 2 is at figure 2 shown schematically. The first contact 21 of the circuit breaker 2 is provided with a first main contact area 23 and a first arcing contact area 24 . The second contact 22 of the circuit breaker 2 is provided with a second main contact area 25 and a second arcing contact area 26 . In the disconnected condition is depicted the figure 2 The circuit breaker 2. In the disconnected condition, the first an...

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PUM

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Abstract

The invention relates to a device for monitoring the condition of a circuit breaker (2), comprising: an injection unit (51) for injecting a transient test signal into a first contact of the circuit breaker; a detection unit (52) for detecting The generated transient signal at the second contact of the circuit breaker; the first coupling part (53) for coupling the transient test signal provided by the injection unit into the first contact (21); and the second A coupling part (54) for coupling the detection unit to the second contact (22) to receive the generated test signal, wherein at least one of the first and second coupling parts is connected to the first and second contact (21, 22) Provide galvanic separation, characterized in that the first coupling part (53) is connected between the first contact (21) and ground, and wherein the second coupling part (54) is connected between the second contact (22) and between the ground.

Description

technical field [0001] The present invention relates to circuit breakers for medium and high voltage applications and in particular to measuring contact ablation of medium and high voltage circuit breakers for monitoring purposes. Background technique [0002] Circuit breakers are used to switch electrical connections for the supply, generation, distribution and transmission of electrical energy. [0003] When a circuit breaker is operated to interrupt a high current, an arc is formed which tends to ablate the contact area of ​​the circuit breaker. Therefore, a common high voltage circuit breaker has a pair of arcing contacts and a pair of main contacts which close or open with a certain time delay when the circuit breaker is operated. Under the fully closed condition, the arcing contacts and the main contacts are electrically connected in parallel. While the main contact pair provides very low impedance under closed condition, the arcing contact pair presents higher imped...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01R31/327G01R31/28
CPCG01R31/3275G01R31/2839G01R31/327
Inventor G-L.马当纳M.兹拉坦斯基M.霍奇勒内特Y.马雷特A.尤基S.马林科维
Owner HITACHI ENERGY SWITZERLAND AG