METHOD FOR DETECTION OF SINGLE-PHASE EARTH FAULT LOCATION IN RAMIFIED OVERHEAD POWER TRANSMISSION LINE, METHOD FOR DETECTION OF PHASE-TO-PHASE SHORT CIRCUIT IN RAMIFIED OVERHEAD POWER TRANSMISSION LINE AND DEVICE FOR CURRENT AND VOLTAGE MONITORING FOR THEIR REALISATION

摘要

FIELD: electricity.;SUBSTANCE: invention is related to maintenance of overhead power transmission lines (PTL) with ramified structure and may be used for automated detection of single-phase earth fault location in networks with isolated neutral. Method is based on registration of time of phase voltage surge with current and voltage monitoring devices, number of which is more than number of controlled branches by one, in a single time scale, synchronised from satellite signals of global positioning signals. Fixed moments of time are sent to dispatcher centre for joint processing, where a damaged branch is identified, as well as point of damage with the help of a difference-distance method for each pair of time moments registered with current and voltage monitoring devices. Device for current and voltage monitoring in PLT wire comprises supplying and metering current transformers, voltage detector, supply unit, microcontroller, radio modem, receiver of satellite signals from global positioning system. Supplying current transformer is connected to supply unit, metering current transformer via resistive load is connected to microcontroller, as well as voltage detector, radio modem and receiver of satellite signals from global positioning system.;EFFECT: higher speed and convenience of damaged point detection.;2 cl, 1 dwg