Khopolo ea litora tsa phetiso, li-conductors tsa phetiso li tšehetsoa ke likarolo tsa litora tsa phetiso. Mehala e phahameng ea motlakase e sebelisa “litora tsa tšepe,” ha mehala e tlaase ea motlakase, e kang e bonoang libakeng tsa bolulo, e sebelisa “lithupa tsa lehong” kapa “lipalo tsa konkreite.” Ka kakaretso, li bitsoa "litora". Lithapo tse phahameng tsa motlakase li hloka sebaka se seholo sa polokeho, kahoo li hloka ho hlongoa bophahamo bo boholo. Ke litora tsa tšepe feela tse nang le matla a ho tšehetsa lithane tse mashome tsa mela. Palo e le 'ngoe e ke ke ea tšehetsa bophahamo kapa boima bo joalo, kahoo lipalo li sebelisoa hangata bakeng sa maemo a tlase a motlakase.

Ka kakaretso ho na le mekhoa e 'meli ea ho khetholla boemo ba voltage:

1.Mokhoa oa ho tseba ka poleiti ea lipalo

Litora tsa lithapo tsa motlakase o phahameng, hangata ho kenngoa lipoleiti tsa lipalo, tse bontšang ka ho hlaka maemo a fapaneng a motlakase a kang 10kV, 20kV, 35kV, 110kV, 220kV, le 500kV. Leha ho le joalo, ka lebaka la ho pepesehela nako e telele moeeng le letsatsi kapa maemo a tikoloho, lipoleiti tsa lipalo li ka 'na tsa se ke tsa hlaka kapa tsa thatafalloa ho li fumana, tse hlokang tlhokomelo e haufi ho li bala ka ho hlaka.

2.Mokhoa oa ho lemoha mohala oa insulator

Ka ho sheba palo ea likhoele tsa insulator, boemo ba motlakase bo ka khethoa ka mokhoa o batlang o lekana.

(1) likhoele tsa 10kV le 20kV hangata li sebelisa likhoele tse 2-3 tsa insulator.

(2) Lithapo tsa 35kV li sebelisa likhoele tse 3-4 tsa insulator.

(3) Bakeng sa mela ea 110kV, likhoele tse 7-8 tsa insulator li sebelisoa.

(4) Bakeng sa mela ea 220kV, palo ea likhoele tsa insulator e eketseha ho 13-14.

(5) Bakeng sa boemo bo phahameng ka ho fetisisa ba motlakase oa 500kV, palo ea likhoele tsa insulator e holimo ho 28-29.