接地变压器简称接地变，根据填充介质，接地变可分为油式和干式；根据相数，接地变可分接地变压器为三相接地变和单相接地变。 Ground transformer is short for ground change, according to the filling medium, the ground can be divided into oil and dry. According to phase number, earthing transformer can be divided into three phase ground and single phase ground change. 三相接地变：接地变压器的作用是在系统为△型接线或Y型接线中性点无法引出时，引出中性点用于加接消弧线圈或电阻，此类变压器采用Z型接线，与普通变压器的区别是，每相线圈分成两组分别反向绕在该相磁柱上，这样连接的好处是零序磁通可沿磁柱流通，而普通变压器的零序磁通是沿着漏磁磁路流通，所以Z型接地变压器的零序阻抗很小（10Ω左右），而普通变压器要大得多。按规程规定，用普通变压器带消弧线圈时，其容量不得超过变压器容量的20%。Z型变压器则可带90%～100%容量的消弧线圈，接地变除可带消弧圈外，也可带二次负载，可代替所用变，从而节省投资费用。 Three-phase grounding: the role of the earthing transformer is in type system for delta connection or Y type of neutral point can't elicit elicit neutral point is used to add arc suppression coil or resistance, this transformer USES Z connection, and is the difference between the ordinary transformer and coil of each phase is divided into two groups, respectively, reverse around the magnetic pole, the benefits of such connections are zero sequence magnetic flux can flow along the magnetic column, the zero sequence and ordinary transformer magnetic flux is along the magnetic flux leakage magnetic circuit circulation, so the zero sequence impedance Z earthing transformer is small (about 10 Ω), and ordinary transformer is much larger. According to the regulations, the capacity of the transformer coil shall not exceed 20% of the capacity of the transformer. Z type transformer can take 90% ~ 100% capacity of the arc suppression coil, grounding besides can take away loop, also can bring secondary load, can be used instead of change, so as to save investment costs. 单相接地变：单相接地变主要用于有中性点的发电机、变压器的中性点接地电阻柜，以降低电阻柜的造价和体积。 Single phase ground change: single phase earth change is mainly used for the neutral resistance cabinet of the midpoint of the generator and transformer, which is used to reduce the cost and volume of the resistance cabinet.