Method of determining probability of localities of asymmetric faults in electric power mains and monitoring system intended for making the method

摘要

The method of determining the probability of the occurrence of asymmetric faults, where the back-up of the monitored distribution system is created, based on the exceeding of the reversal of the current return component, the coordination time of the failure is evaluated, the records of the change of the voltage feedback recorded on the secondary sides are collected for the given coordination failure time distribution transformers (HV / LV) and back-flow recordings of power transformer (VN / VN) currents, recordings determine the maximum reversal of the current and voltage return corresponding to the point at which the sum of all reversals of the reversal components is maximum, maximum changes in the voltage return components are converted to the primary side of the respective distribution transformer (VN / NN), from the recalculated maximum variations of the voltage feedback components and the maximum variations of the reverse components the individual deviations of the absolute values of the calculated changes of the feedback component of the voltage and the recorded values of the maximum changes of the reverse component of the voltage in the individual measuring nodes (MU) are calculated to the current, the total deviations of the absolute values of the calculated changes of the reverse component of the voltage and the recorded values of the maximum changes of the reverse component of the voltage for each node , quantifies the probability of occurrence of a source of asymmetry in individual locations of the monitored system.