铁芯正常时需要一点接地的原因
Reasons for the need for a point of grounding when the iron core is normal
变压器正常运行时,带电的绕组与油箱之间存在电场,而铁芯和其他金属构件处于该电场中.由于电容分布不均,场强各异,如果铁芯的金属软管不锈钢软管不可接地,则将产生充放电现象,破坏固体绝缘和油的绝缘强度,所以铁芯必须有一点可接地.
In normal operation of transformer, there is an electric field between the live winding and the oil tank, and the iron core and other metal components are in the electric field. Because of the uneven distribution of capacitance and the different field strength, if the stainless steel hose of the metal hose with iron core is not grounded, it will generate charging and discharging phenomenon, which will destroy the insulation strength of solid insulation and oil, so the iron core must have a point of grounding.