消弧柜的配置与选用

为消除6～35 kV电网中的弧光接地过电压,笔者提出了一种改进型消弧柜,称作B型消弧柜。当电网发生单相弧光接地时,这种消弧柜可以根据预先设定的运行模式,通过高压真空接触器直接将故障相接地以消除弧光接地过电压,或者仅仅动作于信号。对于大多数6～35 kV电网而言都可设置两台B型消弧柜,其中一台用作消弧设备,而另一台用作智能电压互感器柜,它们互为备用。实际运行结果表明:在选型、配置及使用正确的情况下,这种消弧柜可有效消除6～35 kV电网中的弧光接地过电压,因而可广泛地用作6～35 kV电网的消弧设备。

Configuration Selection and Application of Arc-overvoltage Suppressors

To eliminate the arc-overvoltage in 6～35 kV power systems,an improved arc-overvoltage suppressor,named B-type arc-overvoltage suppressor,is proposed.When single-phase arc-grounding appears,the suppressor can control a high-voltage vacuum contactor to ground the fault phase bus to avoid the arc-overvoltage,or only operate to give an alarm signal without grounding operation,according to the preset operation mode for it.Two arc-overvoltage suppressors(B-type) may be configured for a 6～35 kV power system,where one is used as an arc-overvoltage suppression device and the other as an intelligent potential transformer cabinet.Each of them can be the backup device for the other.The practical application shows that the B-type arc-overvoltage suppressors can eliminate the arc-overvoltage in 6 ～35 kV power systems if their configuration,selection and application are correct.