保定电气厂

母线PT开关柜内为什么需要装一次消谐装置呢？

Why need to be packed in a bus PT in the switch cabinet time harmonic elimination device?

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 in 6 to 35 kv neutral point is not effective in the grounding grid voltage transformer has the following two questions need to solve:

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。

2, the arc grounding grid voltage transformer has been burned. 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; Can effectively inhibit clearance of arc grounding through the pressure changing winding current, prevent pressure getting burned; Restriction system of single-phase grounding disappears in a winding circuit of pressure change of flow, the flow can be damaged by pressure changed or make the pressure blown fuse; When the single-phase grounding system can be a long time to protect the pressure change from damage.