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This paper presents a novel approach designed for centralize substation level protection to determine the faulty feeder in a distribution network In opposite to phase-to-earth faults in the transmission networks (HV), which neutral points are solidly earthed, fault-loops in a fault-to-earth case in MV distribution networks have big impedance. Additionally during the earth-fault the transient component...
This paper presents a new algorithm for faulty phase selection in transmission lines. The algorithm is based on a limited soft processing of the 3-phase and the zero-component current phasors. Current phasors are determined by using a pair of short length data window filters giving orthogonal outputs — phasor components. The soft processing means here that, generally, the operations like min and max...
A new algorithm designated for locating faults on a double-circuit line is presented. It is assumed that the fault location function is incorporated into the current differential relay at the particular line end. Besides three-phase currents measured synchronously at both line ends, which are utilized by the protective relays, the fault locator is supplied with three-phase voltage from the local line...
This paper presents an analysis of possibility of detection of a fault position with respect to the compensating bank in a series compensating transmission line. The algorithm designed for this purpose is based on determining the contents of dc components in the distance relay input currents. Fuzzy logic technique is applied for making the decision whether a fault is in front of the compensating bank...
The paper presents an adaptive procedure for digital distance protection device that allows to compensate for the negative influence of the reactance effect, caused by fault resistance and pre-fault power flow. The procedure utilizes locally measured phase currents and voltages and has been designed to operate with double-circuit power lines. The algorithm calculates on-line shift vector components...
This paper presents an adaptive method for non-pilot distance protection of a power transmission line. It exhibits improved operation under resistive faults, i.e. reducing an under reaching and overreaching of the relay, that is caused by a remote line end infeed. Use of one-end measurements and also two-end synchronized measurements are considered. The developed adaptive distance protection algorithms...
This paper presents a new method for locating faults on three-terminal power lines. Estimation of a distance to fault and indication of a faulted section is performed using three-phase current from all three terminals and additionally three-phase voltage from the terminal at which a fault locator is installed. Such a set of synchronized measurements has been taken into consideration with the aim of...
This paper presents a new method for locating faults on three-terminal power lines. Estimation of a distance to fault and indication of a faulted section is performed using three- phase current from all three terminals and additionally three- phase voltage from the terminal at which a fault locator is installed. The fault location algorithm consists of three subroutines designated for locating faults...
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