Common use of Voltage transformers Clause in Contracts

Voltage transformers. Routine tests ▪ Verification of terminal markings. ▪ Power- frequency voltage withstand test on the primary terminals. ▪ Partial discharge measurements. ▪ Power-frequency voltage withstand test on secondary terminals. ▪ Power – frequency voltage withstand test between sections. ▪ Determinations of errors (accuracy test for phase angle and ratio errors). ▪ Measurement of primary and secondary winding resistance. ▪ Pressure test for the enclosure. ▪ Enclosure tightness test at ambient temperature. 16- Type tests