Ho khaola mochine o se nang mojaro o sebetsang ka har’a marang-rang ho tla hlahisa overvoltage e sebetsang. Ka tsamaiso e nyenyane ea hona joale ea mobu, boholo ba seo ho thoeng ke overvoltage bo ka fihla ho 3 ho makhetlo a 4 ho rated phase voltage; tsamaisong e kholo ea mobu, boholo ba overvoltage ea ts’ebetso e ka boela ea fihla makhetlo a 3 ho rated phase voltage. Ka hona, e le hore u leke hore na sekontiri sa transformer se ka mamella mocheso o lekantsoeng le overvoltage ea ts’ebetso nakong ea ts’ebetso, ho hlokahala hore u etse liteko tse ‘maloa tsa ho koala ka potlako pele transformer e kenngoa ts’ebetsong. Ho phaella moo, ha mochine oa motlakase o se nang mojaro o sebelisoa, ho tla hlahisoa motlakase o monate oa inrush, ‘me boleng ba oona bo ka fihla ho makhetlo a 6 ho isa ho a 8 ho ea hona joale. Kaha ts’ebetso ea ts’ebetso ea ts’oaetso e tla hlahisa matla a maholo a electromotive, tlhahlobo ea ho koala phello e ntse e le tekanyo e sebetsang ea ho nahana hore na matla a mochine oa transformer le tšireletso ea relay e tla sebetsa hampe.