The lowest permissible insulation resistance R60 of transformer windings

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ENCYCLOPEDIA OF RADIO ELECTRONICS AND ELECTRICAL ENGINEERING
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Annex 3.1. The lowest allowable insulation resistance R60 of transformer windings. 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 2

Rated voltage of higher voltage winding, kV	R-values₆₀, MOhm, at winding temperature, °C
Rated voltage of higher voltage winding, kV	10	20	30	40	50	60	70
Oily up to 35	450	300	200	130	90	60	40
Oil 110	900	600	400	260	180	120	80
Oil over 110	No limitation
Dry up to 1 kV	-	100		-	-	-	-
Dry over 1 kV up to 6 kV	-	300		-	-	-	-
Dry over 6 kV	-	500		-	-	-	-

Note. The values given in the table refer to all windings of this transformer.

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