Industry Overview
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 |
| 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 |
| 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 |
| 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 |
Applicable scene
- Dry-type Transformer
- Oil-immersed Transformer
- Oil-immersed Transformer
- Gas-insulated Transformer,SF6
Equipment selection
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ZC-205A DC Resistance Tester
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ZC-203D Full-function variable ratio tester
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ZC-430D-20kv High voltage insulation resistance tester
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ZC-221J Automatic anti-interference dielectric loss tester
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ZC-202B Transformer Capacity and Load Tester
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ZC-500 Power frequency withstand voltage tester
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ZCVF-6000kVA/1000kV Variable Frequency Resonant Test System
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ZC-200-5000kVA-33kV Transformer comprehensive test bench
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ZC-204B Transformer short circuit impedance tester
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ZC-230 Multichannel temperature inspection instrument
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ZC-206A Transformer winding deformation tester
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ZC-210E Transformer Oil Breakdown Voltage Tester
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ZC-212A Trace Moisture Tester
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ZC-215 Insulating oil gas chromatograph analyzer
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ZC-211D Insulation oil dielectric loss tester
