CuriousElectron
Electrical
- Jun 24, 2017
- 192
Greetings, All-
I'm looking at IEEE C57.13-2016, and in the nameplate section for a VT, there is no requirement to define accuracy class for the highest permissible percentage voltage error at any voltage between 5% of the rated voltage up to the nominal voltage rating. It appears the standard is geared towards metering type PT's. In a design where the PT would be used for protection and metering, how would one prove that the transformer would maintain its accuracy limit at low voltage of say 5%(ground fault)?
Thanks,
EE
I'm looking at IEEE C57.13-2016, and in the nameplate section for a VT, there is no requirement to define accuracy class for the highest permissible percentage voltage error at any voltage between 5% of the rated voltage up to the nominal voltage rating. It appears the standard is geared towards metering type PT's. In a design where the PT would be used for protection and metering, how would one prove that the transformer would maintain its accuracy limit at low voltage of say 5%(ground fault)?
Thanks,
EE