Power Distribution Enterprise

Home » Applications » Power Construction & Maintenance Enterprises

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 Items	IEC Standards	ANSI/IEEE Standards
Distribution Transformers	Winding 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 Test	IEC 60076-1, IEC 60076-2, IEC 60076-5, IEC 60567, IEC 60156	IEEE Std C57.12.00, IEEE Std C57.12.90, IEEE Std C57.13, ANSI/NETA ATS-2025
Low-Voltage Circuit Breakers	Insulation Resistance Test, Dielectric Withstand Voltage Test, Contact Resistance Measurement, Mechanical Operation Test, Interlocking Test, Short-Circuit Breaking Test, Overload Protection Test	IEC 60947-1, IEC 60947-2, IEC 60060-1, IEC 61439-1	IEEE 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 Test	IEC 60044-1, IEC 60044-2, IEC 61869-1, IEC 60060-1	IEEE 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 Test	IEC 60502-1, IEC 60840, IEC 60228, IEC 60332, IEC 60230	IEEE Std 400, IEEE Std 400.2, IEEE Std 575, ANSI/ICEA S-94-649
Distribution Switchgear & Switchboards	Insulation Resistance Test, Dielectric Withstand Voltage Test, Contact Resistance Measurement, Mechanical Operation Test, Interlocking Test, Short-Circuit Withstand Test, Phase Sequence Test	IEC 62271-1, IEC 62271-100, IEC 61439-1, IEC 60060-1	IEEE 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 Test	IEC 60099-4, IEC 60099-6, IEC 61000-4-5, IEC 62271-1	IEEE Std C62.11, IEEE Std C62.22, IEEE Std C37.20.1, IEEE Std 1262
Distribution Insulators	Insulation Resistance Test, AC Withstand Voltage Test, Puncture Withstand Test, Wet Power-Frequency Voltage Test, Mechanical Strength Test, Pollution Resistance Test	IEC 60383-1, IEC 60383-2, IEC 61109, IEC 60060-1, IEC 60507	IEEE Std 43, IEEE Std C29.1, IEEE Std C29.2, ANSI/NETA ATS-2025
Protective Relays & Distribution Control Systems	Relay Function Test, Setting Value Calibration, Tripping Time Test, Interlocking Test, Fault Diagnosis Test, Communication Test, Overcurrent/Overvoltage Protection Test	IEC 61850, IEC 60255, IEC 61508, IEC 62271-100	IEEE 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 Test	IEC 60156, IEC 60567, IEC 60296, IEC 60814	ASTM D877, ASTM D1533, ASTM D3612, IEEE Std C37.12
Distribution Grounding Devices	Ground Resistance Measurement, Ground Continuity Test, Corrosion Detection Test, Current Distribution Test, Lightning Impulse Withstand Test	IEC 60364-4-41, IEC 62305-3, IEC 60060-1, IEC 61312-1	IEEE Std 81, IEEE Std 142, IEEE Std 1584, ANSI/NETA ATS-2025