Power frequency test voltages for insulation of DC machines

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ENCYCLOPEDIA OF RADIO ELECTRONICS AND ELECTRICAL ENGINEERING
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Annex 3.1. Power frequency test voltages for isolation of DC machines. 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 33

Test item	Test voltage, kV	Directions
Windings:		Produced for machines with a power of more than 3 kW
machines for voltage up to 100 V	1,6 U_Mr. + 0,8
machines for voltages above 100 V with power up to 1000 kW	1,6 U_Mr. + 0,8, but not less than 1,2
machines for voltages above 100 V with a power of more than 1000 kW	1,6 U_Mr. + 0,8
exciters of synchronous motors and synchronous compensators	0,8 U_Mr., but not less than 1,2 and not more than 2,8
Anchor bandages	1	For machines over 3 kW
Rheostats and ballast resistors	1	Isolation can be tested together with isolation of excitation circuits

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