Permissible values of tgδ insulation of bushings and bushings at a temperature of 20 °C

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ENCYCLOPEDIA OF RADIO ELECTRONICS AND ELECTRICAL ENGINEERING
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Annex 3.1. Allowed values tgδ insulation of inputs and bushings at a temperature of 20 °C. 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 14

Type and zone of input isolation	Limit values tgδ, %, for bushings with rated voltage, kV
Type and zone of input isolation	35	110 - 150	220
Oil-paper insulation:
basic insulation (C₁) and measuring capacitor insulation (C₂)	-	1,5	1,2
last layers of insulation (C₃)	-	3,0	2,0
Oil-filled solid insulation: basic insulation	1,5	1,5	-
Bakelite-paper insulation with mastic filling: basic insulation	9,0	-	-
Oil barrier bushing insulation: basic insulation	-	5	4

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