VLF vs DAC (Oscillating Wave) Testing: Choosing an AC Method for MV Cables
To prove or diagnose a medium-voltage cable in the field you need an alternating test voltage, but 50 Hz is impractical over any real cable length and DC damages extruded insulation. Two technologies answer that problem from opposite directions. VLF applies a continuous sine wave at 0.1 Hz; DAC (damped AC, sold in Europe as […]