we are offering vlf test set. the 20 kv pgt 20-v3.6 type and 36 kv pgt 36-v2 type versions of the portable vlf test set enable testing of medium voltage cables with extruded insulation (vpe, pe, epr insulation) and with a nominal voltage of up to 6.3/11 kv and 12/20 kv respectively. the low-load vlf method uses a low-frequency alternating voltage of 0.1 hz and a maximum of 20 or 36 kv for testing