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Ferroresonance Caused By Iron Core Saturation In Electromagnetic Voltage Transformer
Mar 23, 2018

Operating experience shows that China's production of neutral point insulation, neutral grounding via arc suppression coil (but the arc suppression coil from temporary operation may) and neutral grounding (earthing but temporary disconnect may) 3 220KV power grid, have occurred in electromagnetic voltage transformer core saturation caused by ferroresonance overvoltage. For example, the temporary grounding has caused resonance overvoltage of transformer substation for the neutral point of a Jiangsu 220Kv, the Northeast power grid a 154KV arc suppression grounding system by four, because of the arc suppression coil from the temporary operation overvoltage caused by resonant transformer; a power plant in Jilin province 35KV neutral insulation system. The resonant overvoltage of the transformer has been aroused many times. The 6KV neutral point ungrounded system of a power plant in Shandong province has also occurred the ferromagnetic resonance overvoltage caused by the electromagnetic voltage transformer. Among them, the frequent occurrence in the distribution network with neutral point insulation is the most common internal overvoltage, which is the most frequent accident, because other grounding systems are likely to generate such overvoltages only when they become the neutral point system.

When the overvoltage occurs due to transformer core saturation, resulting in the winding excitation current is increased, serious when can reach more than 100 times the rated excitation current, causing the fuse, fuel injection, winding transformer burning or explosion, in some cases, the overvoltage can be very high (about the maximum phase voltage of 3 times), caused by explosion insulation flashover or lightning arrester, in addition, when the overvoltage occurs, there will be a virtual ground phenomenon, in fact there is no place of grounding grid. The operator to cause the illusion. In a word, when this overvoltage occurs, it will bring a great threat to the safe operation of the power grid, so it will cause the power system to pay more attention to the power system.


Add: No.38 South Taoyuan Road, Yaozhuang Town,Jiashan County, Jiaxing City, Zhejiang Province, China
Contact person: Elva Zhuang&Sunny Ni
Tel:+86-573-84775555
Fax:+86-573-84776699
Phone:+86-13732570078
E-mail:
sales9@great-relay.com
       sunny.ni@great-relay.com