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Avoiding under-reaching in twin circuit lines without residual current input from the parallel line

P., Nallagownden and R.N., Mukerjee and M.F., Bin Abdullah and K.K., Tan (2007) Avoiding under-reaching in twin circuit lines without residual current input from the parallel line. In: 8th International Power Engineering Conference, IPEC 2007, 3 December 2007 through 6 December 2007, Singapore.

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Abstract

Mutual coupling presents difficult problems during single phase to earth fault, in transmission line protection. In lines, on multiple circuit towers or on the same right of way, the zero-sequence circuits of the lines get mutually coupled, causing an error in the apparent impedance seen by the relay. This causes the distance protection relay at one end of the faulty line to overreach and the relay at the other end to under-reach. Also, incorrect sensing of the ground fault due to zero-sequence voltage inversion caused by mutual coupling in the zero-sequence network may lead to false trip of the neighbouring healthy line. The paper develops characteristic expressions for the effective sequence impedances experienced by a twin-circuit, both with and without mutual coupling and presents a non-iterative microprocessor based real time algorithm for computing fault distance and zero sequence compensation in basic distance relaying scheme, Residual current measurement from the parallel circuit is not required in the algorithm. © 2007 RPS.

Item Type:Conference or Workshop Item (Paper)
Uncontrolled Keywords:Boolean functions; Computer networks; Electric breakdown; Electric current measurement; Electric fault location; Electric power system protection; Iterative methods; Parallel algorithms; Relay protection; Distance measurement; Fault location; Mutual coupling; Power system faults; Power system relaying; Power transmission; Protective relaying; Coupled circuits
Subjects:T Technology > TK Electrical engineering. Electronics Nuclear engineering
Departments / MOR / COE:Departments > Electrical & Electronic Engineering
ID Code:459
Deposited By: Ir Perumal Nallagownden
Deposited On:09 Mar 2010 02:00
Last Modified:19 Jan 2017 08:27

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