Power Distribution Enterprise

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Industry Overview

Electrical tests for power distribution enterprises are conducted to check insulation condition and operation reliability, discover hidden defects, and ensure safe, stable and high-quality power supply for users.

Test Objects (Tested Specimens)Test ItemsIEC StandardsANSI/IEEE Standards
Distribution TransformersWinding DC Resistance Test, Insulation Resistance Test, Dielectric Loss (tanδ) Test, Voltage Ratio Test, No-Load Loss Test, Load Loss Test, Temperature Rise Test, Partial Discharge TestIEC 60076-1, IEC 60076-2, IEC 60076-5, IEC 60567, IEC 60156IEEE Std C57.12.00, IEEE Std C57.12.90, IEEE Std C57.13, ANSI/NETA ATS-2025
Low-Voltage Circuit BreakersInsulation Resistance Test, Dielectric Withstand Voltage Test, Contact Resistance Measurement, Mechanical Operation Test, Interlocking Test, Short-Circuit Breaking Test, Overload Protection TestIEC 60947-1, IEC 60947-2, IEC 60060-1, IEC 61439-1IEEE Std C37.06, IEEE Std C37.20.1, ANSI C37.10, ANSI/NETA ATS-2025
Current/Voltage Transformers (CT/VT)Ratio Error & Phase Error Test, Insulation Resistance Test, Dielectric Withstand Test, Polarity Test, Excitation Characteristic Test, Winding Resistance TestIEC 60044-1, IEC 60044-2, IEC 61869-1, IEC 60060-1IEEE Std C57.13, IEEE Std C57.13.1, IEEE Std C37.2, ANSI/NETA ATS-2025
Distribution Cables (LV/HV)Conductor Resistance Measurement, Insulation Resistance Test, AC Withstand Voltage Test, Partial Discharge Test, Thermal Cycle Test, Abrasion Resistance Test, Flame Retardancy TestIEC 60502-1, IEC 60840, IEC 60228, IEC 60332, IEC 60230IEEE Std 400, IEEE Std 400.2, IEEE Std 575, ANSI/ICEA S-94-649
Distribution Switchgear & SwitchboardsInsulation Resistance Test, Dielectric Withstand Voltage Test, Contact Resistance Measurement, Mechanical Operation Test, Interlocking Test, Short-Circuit Withstand Test, Phase Sequence TestIEC 62271-1, IEC 62271-100, IEC 61439-1, IEC 60060-1IEEE Std C37.06, IEEE Std C37.20.1, ANSI C37.10, ANSI/NETA ATS-2025
Surge Arresters (Distribution System)Insulation Resistance Test, Leakage Current Measurement, Lightning Impulse Withstand Test, Operating Voltage Test, Thermal Stability Test, EMC TestIEC 60099-4, IEC 60099-6, IEC 61000-4-5, IEC 62271-1IEEE Std C62.11, IEEE Std C62.22, IEEE Std C37.20.1, IEEE Std 1262
Distribution InsulatorsInsulation Resistance Test, AC Withstand Voltage Test, Puncture Withstand Test, Wet Power-Frequency Voltage Test, Mechanical Strength Test, Pollution Resistance TestIEC 60383-1, IEC 60383-2, IEC 61109, IEC 60060-1, IEC 60507IEEE Std 43, IEEE Std C29.1, IEEE Std C29.2, ANSI/NETA ATS-2025
Protective Relays & Distribution Control SystemsRelay Function Test, Setting Value Calibration, Tripping Time Test, Interlocking Test, Fault Diagnosis Test, Communication Test, Overcurrent/Overvoltage Protection TestIEC 61850, IEC 60255, IEC 61508, IEC 62271-100IEEE Std C37.2, IEEE Std C37.90, IEEE Std 1547, ANSI/NETA ATS-2025
Insulating Oil (Distribution Transformers)Breakdown Voltage Test, Moisture Content Test, Dissolved Gas Analysis (DGA), Viscosity Test, Acid Number Test, Oxidation Stability TestIEC 60156, IEC 60567, IEC 60296, IEC 60814ASTM D877, ASTM D1533, ASTM D3612, IEEE Std C37.12
Distribution Grounding DevicesGround Resistance Measurement, Ground Continuity Test, Corrosion Detection Test, Current Distribution Test, Lightning Impulse Withstand TestIEC 60364-4-41, IEC 62305-3, IEC 60060-1, IEC 61312-1IEEE Std 81, IEEE Std 142, IEEE Std 1584, ANSI/NETA ATS-2025

Applicable scene

  • European box substation1
    European box substation
  • European box substation
    European box substation
  • Drawer-type switchgear
    Drawer-type switchgear
  • American box substation
    American box substation

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