METHOD FOR SEARCH OF ELEMENT WITH REDUCED INSULATION RESISTANCE IN PARALLEL ELECTRIC NETWORK OF DIRECT CONTROL CURRENT

摘要

FIELD: electrical engineering. ^ SUBSTANCE: a test alternating current and pulses of a high-frequency current synchronized with the moment of transition through the zero of the alternating voltage at the network poles are applied to the network. The length of the high-frequency current pulses equals half the period of the test alternating current. The test alternating current and the high-frequency current pulses are separated in the current of the element under test. The active component of the alternating current is measured on the basis of calculation of the half-cycles of the high-frequency current getting in the time internal between the moment of transition through the zero of the alternating test current of the element under test and the moment of vanish of the high-frequency current pulse. The reduction of the insulation resistance in the element under test is determined according to the fact of an increase of the current active component. ^ EFFECT: enhanced noise immunity and reduced, influence of the of the network parameters on the device operation. ^ 2 dwg