Schemes for measuring the characteristics of the insulation of transformers

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ENCYCLOPEDIA OF RADIO ELECTRONICS AND ELECTRICAL ENGINEERING
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Annex 3.1. Schemes for measuring the characteristics of the insulation of transformers. 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 3

Measurement sequence	Double winding transformers		Three winding transformers
Measurement sequence	Windings to be measured	Grounded parts of the transformer	Windings to be measured	Grounded parts of the transformer
1	NN	Buck, VN	NN	Tank, CH, HV
2	HV	Buck, NN	SN	Buck, HH, HH
3	(HV + MV)*	Tank	HV	Buck, HH, CH
4	-	-	(HV + MV)*	Buck, NN
5	-	-	(HV + MV + LV)*	Tank

During operation, it is also allowed to carry out measurements in isolation zones (for example, VN - tank, LV - tank, VN - LV) with the connection of the "screen" output of the megohmmeter to a free winding or tank.
* Measurements are mandatory only for transformers with a capacity of 16000 kVA and more.

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

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