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Zheng L.,Jinhua Power Electrical Bureau
Gaoya Dianqi/High Voltage Apparatus | Year: 2010

Frequent start of hydraulic mechanism of a circuit breaker is usually caused by the air in the control loop of oil pump. The author analyzes the source and the effect of the air on the efficiency of oil pump, and suggests making an auto-exhaust valve to solve the problem. Application verifies the suggestion. Source


Zheng L.,Jinhua Power Electrical Bureau
Gaoya Dianqi/High Voltage Apparatus | Year: 2012

For higher reliability of power supply, the interval of periodic outage for detecting equipment performance gets longer. Due to confined interior space in a switchgear, higher insulation capability of its internal components is required, therefore online insulation detection of the components is necessary. In this paper, the acoustic emission technique is employed to detect partial discharge in switchgear, and provide criteria for judgment of partial discharge in switchgear by analyzing various acoustic emission intensities. Consequently, online detection of the insulation performance of switchgear without outage is realized to effectively enhance safety and reliability of the switchgear equipment. Source

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