Electromagnetic voltage transformers

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ENCYCLOPEDIA OF RADIO ELECTRONICS AND ELECTRICAL ENGINEERING
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Annex 3. Standards for testing electrical equipment and apparatus for electrical installations of consumers

Electromagnetic voltage transformers

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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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M - are produced within the time limits established by the PPR system.

Name of the test	Type of test	Test norms	Directions
21.1. Insulation resistance measurement:	М
1) primary windings		The insulation resistance of transformers with voltages up to 35 kV must be at least 100 MΩ, for transformers with voltages of 110 - 220 kV - at least 300 MΩ	Produced by a megohmmeter for a voltage of 2500 V
2) secondary windings		The insulation resistance of the secondary windings together with the connected circuits, as well as the connecting windings of cascade transformers, must be at least 1 MΩ	Produced by a mega ohmmeter for a voltage of 1000 V
21.2. Transformer oil test	М	The oil is tested for compliance with the indicators of Table. 6 items 1 - 3, taking into account the notes to the table (Appendix 3.1) Oil from transformers with voltage up to 35 kV may not be tested	For oil-filled cascade voltage transformers, the assessment of the oil condition in individual stages is carried out according to the standards corresponding to the stage voltage
21.3. Thermal imaging control	М	Produced in accordance with established standards and manufacturer's instructions

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