干式变压器的垫块的高度是有明确要求的，主要的目的是考虑线圈和夹件的爬电距离，距离太近的话一般工频耐压很难过的

The height of the pad of dry type transformer is clear. The main purpose is to consider the creepage distance between the coil and the clip. The distance is too close, so the general power frequency withstand voltage is very sad.