摘要
放电计数器用于判断避雷器在运行中是否动作并记录动作次数,以便积累资料并有助于现场的事故分析,是避雷器的重要配套设备。在实际运行中,由于计数器动作电流的不同,造成记录数据的不准确,给过电压分析、避雷器动作状态的评估带来困难。因此研究放电计数器的灵敏性对准确分析过电压和判定避雷器工作状态具有重要意义。笔者研究了110 kV及以下避雷器用放电计数器对于不同波形、不同幅值的动作灵敏性,结果表明:放电计数器的动作灵敏性与冲击电流的幅值、波形有关,与电流的极性基本无关。放电计数器存在明确的可靠动作电流上、下限值,其值与波形有关,冲击电流波头时间越短,放电计数器的动作电流上限值越高。
In the operation, discharge counter determine whether the action of surge arrester and record the number of surge arrester＇ s actions, these can accumulate information and help to the field accident analysis; it is an important equipment for surge arrester. In actual operation, since the different of operating currents for the counters, resulting in inaccurate data recording, it not only makes the over-voltage analysis and the assessment of the state arrester operation become difficulty. It is important to study the sensitivity of the discharge counter for analyzing over-voltage and determining the surge arrester working condition. After studying the action sensitivity of discharge counter for 110 kV and below surge arrester, the result showed that the action sensitivity of discharge counter is related to the impulse current amplitude and waveform, and largely independent of current polarity. The discharge counter has obvious upper and lower limit current amplitude, the amplitude is related to the wave of impulse current, the shorter front time of the impulse current, the higher of the discharge counter＇s upper limit current amplitude.
出处
《电瓷避雷器》
CAS
北大核心
2011年第6期65-69,共5页
Insulators and Surge Arresters
关键词
避雷器
计数器
冲击电流
灵敏性
surge arrester
counter
impulse current
sensitivity
