变压器铁芯常见的故障类型有下述六种：

Transformer iron core common fault types are the following six:

（1）铁芯碰壳、碰夹件。安装完毕后，由于疏忽，未将油箱顶盖上运输用的稳（定位）钉翻转过来或拆除掉，导致铁芯与箱壳相碰；铁芯夹件肢板碰触铁芯柱；硅钢片翘曲触及夹件肢板；铁芯下夹件垫脚与铁轭间纸板脱落，垫脚与硅钢片相碰；温度计座套过长与夹件或铁轭、芯柱相碰等。

(1) the iron core touches the shell and touches the clamp. After installation, due to negligence, not for transport tank on the roof stability (location) nail over or removed, resulting in core and shell collision; iron core clamp plate touch limb iron core silicon steel sheet; warping touch clamps limb plate; iron core clamping piece and yoke board between stepping off. Stepping and silicon steel sheets collide; thermometer and clamp or long sleeve yoke, column collision etc..

（2）穿芯螺栓钢座套过长与硅钢片短接。

(2) penetration bolt steel sleeve is too long and short circuit of silicon steel sheet.

（3）油箱内有异物，使硅钢片局部短路。如山西某变电所的一台31500/110型电力变压器发生铁芯多点接地，吊罩发现在夹件与铁轭间有一把天柄螺丝起子；另一变电所一台60000/22O型电力变压器吊罩启发现有一根120mm长的铜丝；还有一个变电所台120000/220型电力变压器吊罩后在下夹件与铁轭之间找出一锅块；再如，东北某变电所的一台大型电力变压器发生铁芯多点接地，吊罩检查发现油箱底部有三段曲折型钢丝，钢丝的直径约0.31mm,长度分别为25、28、31mm.

(3) there is a foreign matter in the tank to make the local short circuit of the silicon steel sheet. As a Shanxi substation of a 31500/110 type power transformer core multiple grounding occurs, the hanging cover found in the clamps of the iron yoke a day to handle screwdriver; another substation of a 60000/22O type power transformer hanging cover inspired a 120mm long existing copper wire; and a variable the 120000/220 type power transformer hanging cover after the next clip piece yoke to find a block; again, a substation of a large power transformer core multiple grounding occurs, cover lifting inspection found three tortuous wire at the bottom of the tank, the diameter of the wire length is about 0.31mm, respectively. 25, 28, 31mm.

（4）铁芯绝缘受潮或损伤，如底沉积油泥及水分，绝缘电阻下降，夹件绝缘、垫铁绝缘、铁盒绝缘（纸板或木块）受潮或损坏等，导致铁芯高阻多点接地。

(4) core insulation damp or damage, such as sediment sludge and water, insulation resistance, clamps insulation, insulation, insulation pad iron tin (cardboard or wood) wet or damaged, leading to the core of high resistance grounding point.

（5）潜油泵轴承磨损，金属粉末进入油箱中，堆积在底部，在电磁引力作用下形成桥路，使下铁轨与垫脚或箱底接通，造成多点接地。

(5) the submersible pump bearing wear, metal powder into the tank, accumulate in the bottom, forming a bridge in the electromagnetic force, so that the track and stepping or bottom is caused by multi point grounding.

（6）运行维护差，不按期检修。

(6) poor operation and maintenance, not scheduled maintenance.