Terata e kentsoeng ka makhetlo a mararo kapa terata e matlafalitsoeng e entsoeng ka likarolo tse tharo, e koala ka botlalo ea mantlha ho tloha ho ea bobeli ea transformer.Insulation e matlafalitsoeng e fana ka litekanyetso tse fapaneng tsa polokeho tse tlosang litšitiso, litheipi tsa inter layer le li-tubes tse sireletsang ka har'a transformer.
Molemo ka ho fetisisa oa terata e entsoeng ka makhetlo a mararo ha e felle feela ka ho senyeha ha motlakase ho fihlela ho 17KV, empa Ho phaella ho fokotsa boholo le moruo ka litšenyehelo tsa thepa ea tlhahiso ea transformer.