Transmission Enterprise

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Industry Overview

Electrical tests for power transmission enterprises are implemented to inspect insulation status and operation reliability, detect potential defects, and ensure the safety, stability and reliability of power transmission and distribution.

Test Objects (Tested Specimens)Test ItemsIEC StandardsANSI/IEEE Standards
Power Transmission TransformersWinding DC Resistance Test, Insulation Resistance Test, Dielectric Loss (tanδ) Test, Voltage Ratio & Phase Displacement Test, Short-Circuit Withstand Test, Temperature Rise Test, Partial Discharge Test, Dissolved Gas Analysis (DGA)IEC 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
High-Voltage Circuit BreakersInsulation Resistance Test, Dielectric Withstand Voltage Test, Contact Resistance Measurement, Mechanical Operation Test, Interlocking Test, Short-Circuit Breaking & Making Test, SF6 Gas Purity & Moisture TestIEC 62271-100, IEC 62271-1, IEC 60060-1, IEC 60376, IEC 60480IEEE Std C37.06, IEEE Std C37.20.1, IEEE Std 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, Partial Discharge Test, Winding Resistance TestIEC 60044-1, IEC 60044-2, IEC 61869-1, IEC 60060-1, IEC 60270IEEE Std C57.13, IEEE Std C57.13.1, IEEE Std C57.13.6, IEEE Std C37.2
Overhead Transmission LinesConductor Resistance Measurement, Insulation Resistance Test, Tension Test, Wear Resistance Test, Electrical Clearance Check, Current-Carrying Capacity Test, Insulator Puncture TestIEC 60913, IEC 60383-1, IEC 60383-2, IEC 61109, IEC 60228IEEE Std 112, IEEE Std 400, ANSI C29.1, ANSI/ICEA S-94-649
Power Transmission Cables (HV)Conductor Resistance Measurement, Insulation Resistance Test, AC Withstand Voltage Test, Partial Discharge Test, Lightning Impulse Test, Thermal Cycle Test, Insulation Aging TestIEC 60840, IEC 60502-1, IEC 60230, IEC 60228, IEC 60332IEEE Std 400, IEEE Std 400.2, IEEE Std 575, ANSI/ICEA S-94-649
Surge ArrestersInsulation Resistance Test, Leakage Current Measurement, Lightning Impulse Withstand Test, Operating Voltage Test, Thermal Stability Test, EMC Test, Discharge Capacity 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
Power Transmission InsulatorsInsulation Resistance Test, AC Withstand Voltage Test, Puncture Withstand Test, Wet Power-Frequency Voltage Test, Pollution Resistance Test, Mechanical Strength 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 & Transmission Control SystemsRelay Function Test, Setting Value Calibration, Tripping Time Test, Interlocking Test, Fault Diagnosis Test, Communication Test, SIL Verification, Overcurrent Protection TestIEC 61850, IEC 60255, IEC 61508, IEC 62271-100, IEC 61869IEEE Std C37.2, IEEE Std C37.90, IEEE Std 1547, ANSI/NETA ATS-2025
Insulating Oil & SF6 GasBreakdown Voltage Test, Moisture Content Test, Dissolved Gas Analysis (DGA), Viscosity Test, Acid Number Test, SF6 Gas Purity & Moisture TestIEC 60156, IEC 60567, IEC 60296, IEC 60376, IEC 60480ASTM D877, ASTM D1533, ASTM D3612, IEEE Std C37.12, ANSI C37.13
Transmission 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

  • 35-110kV
    35-110kV
  • 220-330-500kV
    220-330-500kV
  • 1000kV AC±800kV DC
    1000kV AC±800kV DC
  • Mountain Power Grid
    Mountain Power Grid

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