| 消谐器用途 |
| 添加时间：2018/9/14 15:42:52 浏览次数： |
| 消谐器用途 Use of detuner 6～35kV中性点不接地电网中的电磁式电压互感器(以下简称PT)，当母线空载或出线较少时，因合闸充电或在运行时接地故障消除等原因的激发，会使电压互感器过饱和，则可能产生铁磁谐振过电压。出现相对地电压不稳定，接地指示误动作，PT高压保险丝熔断等异常现象，严重时会导致PT烧毁，继而引发其它事故。这种情况就需要安装消谐器。 6 ~ 35kV neutral electromagnetic potential transformer in power system (hereinafter referred to as PT), when the bus is empty or outlet is small, excited because of closing charge or at runtime fault elimination and other reasons, the voltage transformer saturation, it may produce ferromagnetic resonance overvoltage. The relative voltage instability, grounding indication malfunction, PT high voltage fuse and other abnormal phenomena will cause PT to burn up and cause other accidents. In this case, it is necessary to install the harmonic eliminator. 消谐器原理其本质是一种高容量非线性电阻器，起阻尼与限流的作用。可以起到良好的限制电压互感器铁磁谐振的效果。 如果6～35kV电网中性点不接地，母线上Y0接线的TV一次绕组，成为该电网对地唯一金属性通道。电网对地电容通过TV一次绕组有一个充放电的过渡过程。试验测得此时常常有最高幅值达数安培的工频半波涌流通过TV，此电流有可能将TV高压熔丝熔断。而安装了消谐器后，这种涌流将得到有效抑制，高压熔丝不再因为这种涌流而熔断。 The principle of harmonic eliminator is a kind of high capacity nonlinear resistor, which plays the role of damping and current limiting. It can effectively limit the effect of ferromagnetic resonance of the voltage transformer. If the neutral point of the 6 ~ 35kV power grid is not grounded, the TV primary winding of the Y0 wiring on the bus is the only metal channel for the power grid. There is a charge discharge transition process for the ground capacitance of the power grid through the TV primary winding. The test results show that the power frequency half wave current with the highest amplitude of amperes at this time passes through TV, and this current may fuse the TV high pressure fuse. When the detuner is installed, the inrush will be effectively suppressed, and the high pressure fuse is no longer broken by the inrush. |
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