Instrument Transformer Factory

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Industry Overview

The purpose of power testing in instrument transformer manufacturing is to verify insulation performance, accuracy, polarity and operational reliability, ensure compliance with standards, and eliminate potential defects before delivery.

Test Objects (Tested Specimens)Test ItemsIEC StandardsANSI/IEEE Standards
Current Transformers (CT)Winding DC Resistance Measurement, Insulation Resistance Test, Ratio Error and Phase Error Test, Polarity Test, Excitation Characteristic Curve Test, Partial Discharge (PD) Measurement, AC Withstand Voltage Test, Dielectric Loss Factor (tanδ) & Capacitance Test, Sealing Performance TestIEC 60044-1, IEC 60044-5, IEC 61869-1, IEC 60060-1IEEE Std C57.13, IEEE Std C57.13.1, IEEE Std C57.13.6
Voltage Transformers (VT/PT)Winding DC Resistance Measurement, Insulation Resistance Test, Ratio Error and Phase Error Test, Polarity Test, Excitation Characteristic Test, Partial Discharge (PD) Measurement, AC Withstand Voltage Test, Dielectric Loss Factor (tanδ) Test, Sealing Performance TestIEC 60044-2, IEC 60044-5, IEC 61869-1, IEC 60060-1IEEE Std C57.13, IEEE Std C57.13.1, IEEE Std C57.13.6
Capacitor Voltage Transformers (CVT)Capacitance & Dielectric Loss Test, Ratio Error and Phase Error Test, Polarity Test, Excitation Characteristic Test, AC Withstand Voltage Test, Partial Discharge Test, Coupling Capacitor Performance TestIEC 60044-5, IEC 61869-1, IEC 60384-1IEEE Std C57.13, IEEE Std C57.13.3, IEEE Std C57.13.6
Electronic Instrument TransformersRatio Error & Phase Error Test, Insulation Resistance Test, Frequency Response Analysis, Linearity Verification, Transient Performance Test, Electromagnetic Compatibility (EMC) Test, Zero Drift Test, Power Consumption MeasurementIEC 61869-1, IEC 61869-10, IEC 61000-4, IEC 61850IEEE Std C57.13, IEEE Std C12.20, IEEE Std 1588
SF₆ Gas-Insulated Instrument TransformersInsulation Resistance Test, AC Withstand Voltage Test, SF₆ Gas Moisture Content Test, SF₆ Gas Leakage Test, Ratio Error & Phase Error Test, Excitation Characteristic TestIEC 60044-1, IEC 60044-2, IEC 62271-203, IEC 60376IEEE Std C57.13, IEEE Std C37.20.1, IEEE Std C57.13.6
Oil-Immersed Instrument TransformersInsulating Oil Breakdown Voltage Test, Oil Moisture Content Test, Dissolved Gas Analysis (DGA), Winding DC Resistance Measurement, Insulation Resistance Test, Ratio Error Test, Partial Discharge TestIEC 60044-1, IEC 60044-2, IEC 60156, IEC 60567IEEE Std C57.13, IEEE Std C57.104, ASTM D877
Combined Instrument TransformersRatio Error & Phase Error Test for CT and VT, Insulation Resistance Test, AC Withstand Voltage Test, Polarity Test, Excitation Characteristic Test, Sealing Performance TestIEC 60044-1, IEC 60044-2, IEC 61869-1IEEE Std C57.13, IEEE Std C57.13.1, IEEE Std C57.13.6
Instrument Transformer BushingsInsulation Resistance Test, Dielectric Loss Factor (tanδ) Test, AC Withstand Voltage Test, Lightning Impulse Withstand Test, Partial Discharge TestIEC 60137, IEC 60060-1, IEC 61869-1IEEE Std C57.13, IEEE Std C57.19.01, IEEE Std C57.19.1

Applicable scene

  • window-type CT
    window-type CT
  • PT
    PT
  • HV CT
    HV CT
  • TPY
    TPY

Equipment selection

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