Transformer Factory

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The core purpose of electrical tests in a transformer factory is to comprehensively verify the electrical performance, insulation integrity, mechanical stability and operational safety of transformers and their key components (including windings, core, on-load tap changers and insulating oil), so as to ensure that all products fully comply with the specifications of relevant IEC and ANSI standards and meet the designed operational requirements before delivery.

Test Objects (Tested Specimens)	Test Items	IEC Standards	ANSI/IEEE Standards
Power TransformersDistribution Transformers	Routine Test (Routine Inspection Test)	IEC 60076-1	IEEE Std C57.12.00
Transformer Windings & Core	Winding Resistance Measurement	IEC 60076-1	IEEE Std C57.12.90
Transformer Windings	Voltage Ratio & Phase Displacement Test	IEC 60076-1	IEEE Std C57.12.90
Transformer Insulation System	Insulation Resistance & Polarization Index (PI)	IEC 60076-1	IEEE Std C57.12.90
Transformer Insulation	Dielectric Loss Factor (tanδ) & Capacitance Test	IEC 60076-1	IEEE Std C57.12.90
Transformer	No-Load Loss & No-Load Current Test	IEC 60076-1	IEEE Std C57.12.90
Transformer	Load Loss & Impedance Voltage Test	IEC 60076-1	IEEE Std C57.12.90
Transformer Insulation	Induced Overvoltage Test (Withstand Voltage)	IEC 60076-3	IEEE Std C57.12.90
Transformer Insulation	Applied Voltage Test (AC Withstand Test)	IEC 60076-3	IEEE Std C57.12.90
Transformer	Temperature Rise Test	IEC 60076-2	IEEE Std C57.12.90
	Short-Circuit Withstand Test	IEC 60076-5	IEEE Std C57.12.90
	Lightning Impulse Voltage Test (LI)	IEC 60076-3	IEEE Std C57.12.90
	Switching Impulse Voltage Test (SI)	IEC 60076-3	IEEE Std C57.12.90
On-Load Tap Changer (OLTC)	OLTC Function & Transition Test	IEC 60214-1	IEEE Std C57.13.12
Transformer Oil	Insulating Oil Breakdown Voltage Test	IEC 60156	ASTM D877 / ASTM D1816
	Oil Moisture Content Test	IEC 60814	ASTM D1533
	Oil Dissolved Gas Analysis (DGA)	IEC 60567	IEEE Std C57.104
Transformer	Partial Discharge (PD) Measurement	IEC 60076-3	IEEE Std C57.12.90
Transformer	Sound Level Test (Noise Measurement)	IEC 60076-10	IEEE Std C57.12.90
Transformer Tank & Sealing System	Sealing Test (Leakage Test)	IEC 60076-1	IEEE Std C57.12.00