Lightning Impulse Voltage Test System for Power Transformers – 1.2/50μs High

The Lightning Impulse Voltage Test System for Power Transformers is designed to evaluate transformer insulation performance under simulated lightning and switching overvoltage conditions.

Power transformers are exposed to transient overvoltages during operation, particularly lightning-related surges and switching events. Impulse testing helps manufacturers and testing laboratories evaluate the insulation system before equipment is placed into service.

The system generates controlled impulse voltages and applies them to the transformer under test. A high-voltage measurement system records the resulting waveform for analysis and evaluation.

The system is suitable for transformer manufacturers, high-voltage laboratories, power utilities and research institutions requiring reliable transformer impulse testing.

• Lightning impulse withstand voltage test
• 1.2/50 μs standard lightning impulse test
• Full-wave impulse test
• Chopped-wave impulse test
• Switching impulse test
• Transformer insulation performance evaluation
• Inter-turn and winding insulation research
• Bushing insulation testing
• Insulation coordination research
• Transformer type testing
• Factory testing
• R&D testing

1. Multi-stage impulse voltage generator
2. DC charging unit
3. Wave-shaping circuit
4. Chopping system
5. High-voltage capacitors
6. High-voltage divider
7. Digital measurement system
8. Oscilloscope/data acquisition system
9. Computer control system
10. Safety interlock and grounding system

The actual configuration can be customized according to transformer voltage level, test capacity, laboratory size and applicable standards.

The 1.2/50 μs waveform is a standard lightning impulse waveform used in high-voltage insulation testing.

The first value represents the nominal front time, while the second represents the nominal time to half-value on the tail of the impulse.

The exact waveform tolerances and test requirements should be determined according to the applicable testing standard and test object.

Lightning impulse testing evaluates the ability of transformer insulation to withstand transient overvoltages associated with lightning and helps verify the insulation design.

Lightning impulse represents fast transient overvoltage conditions, while switching impulse has a significantly longer duration and is associated with switching operations in high-voltage systems.

A chopped impulse is a lightning impulse that is intentionally interrupted by a chopping device at a specified time or voltage level.

Yes. The system can be engineered for large transformer testing. The required generator energy, voltage, capacitance and test circuit depend on the transformer specifications.

Yes. The complete system can be equipped with a digital measurement and analysis system for waveform recording and test-result evaluation.

Yes. The system configuration can be designed according to applicable IEC and other international testing requirements. IEC 60060-1 is a key reference for high-voltage impulse testing, while IEC 60076-3 is specifically relevant to transformer insulation tests.

Recommended information includes transformer rated voltage, insulation level, test voltage, test type, transformer capacitance if available, required impulse waveform, laboratory dimensions and applicable standard.