METHOD FOR MEASURING INSULATION RESISTANCE OF UNGROUNDED DC POWER NETWORK AND FOR LOCALIZING EARTH FAULT, AND CURRENT INJECTING TWO-POLE DEVICE

摘要

FIELD: measuring equipment.;SUBSTANCE: invention relates to measuring insulation resistance in an ungrounded DC electrical network and localizing an earth fault. Essence: two-pole current input device (12) is connected between negative terminal (2) of the network and ground terminal (8) or between ground terminal (8) and positive terminal (3) of the network. Bipolar device (12) has capacitance (20) and diode (15). Current is introduced into the network and the state of the network voltage with respect to the ground terminal is maintained to approximate the operating conditions in the absence of an earth fault. Insulation resistance of the network is defined as the ratio of the DC voltage measured between two terminals (13, 14) of the bipolar device and the DC current flowing through the device. In networks with earth faults through a large resistance, the closure is localized by maintaining a restored voltage and monitoring the DC current introduced into the network from the device.;EFFECT: providing a rapid measurement of the insulation resistance in live ungrounded DC circuits with a large capacitance relative to the ground, the ability to determine the location of the closure through a high resistance or several closures that occur simultaneously in such networks.;8 cl, 2 dwg