Under-reach correction in twin circuits without residual current input from the parallel line

M.F.B., Abdullah and R.N., Mukerjee (2008) Under-reach correction in twin circuits without residual current input from the parallel line. IEEE Transactions on Power Delivery, 23 (3). pp. 1359-1365. ISSN 8858977

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Mutual coupling poses difficult problems witnessed during single phase to earth fault, in transmission line protection. In parallel lines on the same right of way, mutually coupled zero-sequence circuits cause error in the apparent impedance seen by the relay. This causes the distance relay at one end of the faulty line to over-reach while the one at the other end to under-reach. Incorrect sensing of the ground fault due to zero-sequence voltage inversion caused by mutually coupled zero-sequence network may lead to false trip of the neighbouring healthy line. The paper develops characteristic expressions for effective sequence impedances of twin circuit lines and presents a non-iterative microprocessor based algorithm for fault distance and under-reach estimation in real time, for under-reach correction in basic distance relaying scheme. The residual current measurement from the parallel circuit is not required for this purpose. © 2008 IEEE.

Item Type:Article
Uncontrolled Keywords:Electric current measurement; Electric fault location; Iterative methods; Lead; Networks (circuits); Apparent impedance; Distance relaying; Earth faults; Ground faults; Mutual coupling (MC); Non-iterative; Parallel lines; Real time; Residual currents; Right-of way (ROW); Single phasing; Transmission line protection; Zero sequence voltages; Zero-sequence network; Coupled circuits
Subjects:T Technology > TK Electrical engineering. Electronics Nuclear engineering
Departments / MOR / COE:Departments > Electrical & Electronic Engineering
ID Code:364
Deposited By: Ir Mohd Faris Abdullah
Deposited On:09 Mar 2010 01:03
Last Modified:19 Jan 2017 08:26

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