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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 an accurate fault location algorithm for double-circuit transmission lines with series capacitor compensation at both ends. It has been considered that a fault locator utilizes a communication channel of differential protective relays through it phasors of currents at both line ends are exchanged. Besides the phasors of two-end currents, three-phase voltage measured at a local...
This paper presents an algorithm for locating faults on series-compensated transmission lines. The algorithm suits to both single- and double-circuit series-compensated lines. Use of two-end synchronized measurements of currents accomplished by current differential protective relays with additional incorporation of the locally measured three-phase voltage is considered. More superior solution with...
An accurate algorithm for locating faults on a series-compensated line is presented. This algorithm can be applied with current differential protective relays since two-end currents and one-end voltage are utilized as the fault locator input signals. The algorithm applies two subroutines and the procedure for indicating the valid subroutine. The algorithm has been evaluated using the fault data of...
This paper deals with protective relaying issues in relation to connecting the distributed generation sources into the distribution network. The considerations on fault conditions in the networks with incorporated distributed generation sources are analyzed. Protective relaying for such sources is considered. An impact of the sources on fault currents and operating conditions of protective relaying...
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 a new fault location algorithm for three-terminal line, which utilises unsynchronised measurements of three phase currents and voltages from three line terminals. The algorithm consists of three subroutines designated for locating faults on particular line sections. The valid subroutine is indicated with use of a selection procedure. The distributed parameter line model is strictly...
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 accurate fault location algorithm for double-circuit series compensated lines. Use of two-end current and voltage signals with taken into account a more general case of unsynchronized measurements is studied. Different options for analytical synchronization of the measurements are considered. The algorithm applies two subroutines, designated for locating faults on particular...
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...
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