PC57.13.5 - Standard of Performance and Test Requirements for Instrument Transformers of a Nominal System Voltage of 115 kV and Above
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This standard is intended for use as a supplement to IEEE Std C57.13 and as a basis for performance and safety of equipment. It also describes test sequences, criteria, methods and documentation for the test. This standard applies to single-phase instrument transformers of a nominal system voltage of 115 kV and above with capacitive insulation system for line-to-ground connection and for both indoor and outdoor application.
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