lightning impulse - Insulation Testing

Impulse Voltage Withstand Test: Clearances and Solid Insulation

The impulse voltage withstand test fires a short, steep surge across the insulation to see whether it survives the kind of spike that arrives from a lightning strike or a switching event. The waveform is 1.2/50 µs — roughly 1.2 µs to reach peak, 50 µs to fall to half. Here’s the part most write-ups skip. This is… Read More: Impulse Voltage Withstand Test: Clearances and Solid Insulation »

Lightning Impulse Testing for Power Transformers: Why It Works and What It Catches

A lightning strike on a transmission line lasts microseconds. A power transformer is designed to run for forty years. The lightning impulse test is the bridge between those two facts — it proves, in the factory, that the transformer can survive the microsecond event so it can deliver the four decades of service. The test applies a standardized… Read More: Lightning Impulse Testing for Power Transformers: Why It Works and… »