Power frequency test voltages in operation for electrical equipment of voltage classes up to 35 kV with normal and lightweight insulation

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ENCYCLOPEDIA OF RADIO ELECTRONICS AND ELECTRICAL ENGINEERING
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Annex 3.1. Power frequency test voltages in operation for electrical equipment of voltage classes up to 35 kV with normal and lightweight insulation. Encyclopedia of radio electronics and electrical engineering

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Encyclopedia of radio electronics and electrical engineering / Rules for the technical operation of consumer electrical installations (PTE)

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Table 5

Voltage class, kV	Test voltage, kV
	Power transformers, shunt and arc reactors		Apparatus, current and voltage transformers, current-limiting reactors, insulators, bushings, coupling capacitors, shielded conductors, busbars, switchgear and package transformer substation, electrode boilers
	Normal isolation	Lightweight insulation*	Porcelain insulation**	Other types of insulation**
to 0,69	4,3	2,6	1,0	1,0
3	15,3	8,5	24,0	21,6
6	21,3	13,6	32,0 (37,0)	28,8 (33,3)
10	29,8	20,4	42,0 (48,0)	37,8 (43,2)
15	38,3	31,5	55,0 (63,0)	49,5 (56,7)
20	46,8	42,5	65,0 (75,0)	58,5 (67,5)
35	72,3	-	95,0 (120,0)	85,5 (108,0)

* Test voltages of sealed transformers are taken in accordance with the instructions of the manufacturers.
** The values in brackets apply to the gap between the contacts of the switching devices.

See other articles Section Rules for the technical operation of consumer electrical installations (PTE).

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