在10KV中性点不接地系统中，往往由于电磁式PT（简称压变）铁心饱和而引起工频位移过电压和铁磁谐振过电压（通称为压变饱和过电压），造成压变高压熔丝熔断，甚至使压变烧毁，限制这种过电压的措施是多种多样的，较普遍的是采用在压变二次侧开口三角形绕组两端接消谐器的方法，以及今年来采用的在压变一次侧中性点对地接消谐电阻的方法，这两种消谐措施各具特点，应因地制宜，合理选用。
In 10 KV neutral-point non-grounded system, due to the saturation of electromagnetic PT core, power frequency displacement overvoltage and ferroresonance overvoltage (commonly known as voltage saturation overvoltage) are often caused, resulting in the fuse fuse of voltage-varying high voltage and even the burnout of voltage-varying. There are various measures to limit this overvoltage. It is widely used to connect harmonic eliminator at both ends of open triangular winding on the secondary side of voltage transformer and to connect harmonic eliminator to ground at the neutral point on the primary side of voltage transformer this year. These two measures have their own characteristics and should be selected reasonably according to local conditions.