Transformer iyi yakagadzirwa ne epoxy resin ine chimiro chakavharirwa zvachose uye inochengetedza muviri zvizere. Yakagadzirirwa kushandiswa pakuyera voltage, simba remagetsi uye dziviriro ye relay mumagetsi ane frequency 50Hz - 60Hz uye voltage 3, 6, 10 kV kana pasi. Saizi diki, huremu hwakareruka, inogona kuiswa chero panzvimbo.