一.母线PT开关柜内为什么需要装一次消谐装置呢？ A: why do you need to install a dissonance in the PT open locker? 因为在6-35KV中性点非有效接地电网中的电压互感器有以下两个相关问题需解决： Because there are two related problems with the voltage transformer in the 6-35kv neutral network: 1、电压互感器的铁磁谐振产生的过电压常使设备内绝缘击穿、外绝缘放电，且常因事故处理不及时或事故扩大而造成大面积停电； 1, voltage transformer of ferroresonance overvoltage often makes equipment insulation breakdown, external insulation discharge, and often with the expansion of accident treatment time accident cause blackouts; 2、电网中的弧光接地使电压互感器频频烧毁。使用消谐器可有效地解决上述问题：消除或阻尼PT非线性励磁特性而引起的铁磁谐振过电压，这种谐振过电压会导致系统相电不稳定；能有效抑制间隙性弧光接地时流过压变绕组的过电流，防止压变烧毁；限制系统单相接地消失时在压变一次绕组回路中产生的涌流，这种涌流会损坏压变或使压变熔丝熔断；当系统发生单相接地后可较长时间保护压变免受损坏。 The arc of the electric power grid is grounding the voltage transformer. Using harmonic elimination device can effectively solve the above problems: eliminate or damping nonlinear ferroresonance overvoltage caused by excitation characteristics of PT, this kind of resonance overvoltage will lead to an unstable system electricity; It can effectively restrain the overcurrent of the pressure changing winding when the interstitial arc is grounded, prevent the pressure from burning down. To limit the flow of a single phase of the system in the circuit of a winding circuit, which can be damaged by a pressure change or a fuse. The protection pressure can be protected from damage when the system has a single phase grounding.