Digital Distance Relaying Scheme for Compensation of High Resistance Faults on Double Infeed Transmission Lines
Performance of the conventional ground distance relaying scheme is adversely affected by different types of ground faults, such as single line-to-ground, double line-to-ground, and simultaneous open conductor and ground. This effect is more pronounced due
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Digital Distance Relaying Scheme for Compensation of High Resistance Faults on Double Infeed Transmission Lines
Abstract Performance of the conventional ground distance relaying scheme is adversely affected by different types of ground faults, such as single line-to-ground, double line-to-ground, and simultaneous open conductor and ground. This effect is more pronounced due to the considerable value of fault resistance and direction and magnitude of power flow. The work presented in this chapter addresses the aforementioned problems encountered by the conventional ground distance relaying scheme when protecting doubly fed transmission lines. Further, a new digital distance relaying scheme is proposed which compensates the errors produced by the conventional ground distance relaying scheme using local end data only. The detailed analysis of the apparent impedance as seen from the relaying point by the conventional ground distance relaying scheme and the proposed scheme during different types of ground faults is also presented in this paper. The feasibility of the proposed scheme has been tested using MATLAB/SIMULINK software. The simulation results demonstrate the effectiveness of the proposed scheme since it provides accuracy on the order of 98 %.
Keywords Doubly fed transmission line Ground distance relay High resistance fault Simultaneous open conductor and ground fault Single line-to-ground fault
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Introduction
In recent years, digital transmission line distance protection schemes have been widely applied because of their improved performance, monitoring, and communications capabilities. The conventional digital distance relays used to protect the transmission lines are normally installed at starting and finish ends of the transmission lines to detect the faults and to isolate the faulted part from the remaining healthy power system. A distance relay continuously monitors the power system conditions and it operates when the inputs deviate from their normal levels. But, the distance calculation performed by a distance relay is adversely affected by different types of short-circuit faults, open-circuit faults, and combination of both types of © Springer Science+Business Media Singapore 2016 V.H. Makwana and B.R. Bhalja, Transmission Line Protection Using Digital Technology, Energy Systems in Electrical Engineering, DOI 10.1007/978-981-10-1572-4_3
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Digital Distance Relaying Scheme for Compensation …
faults; such as line-to-line faults, line-to-ground faults, and simultaneous open conductor and ground faults. This effect is more pronounced because of the presence of considerable value of fault resistance in the faulted path as well as the direction and magnitude of power flow. The work presented in this chapter addresses the problems encountered by a conventional digital distance relay protecting a double infeed transmission line. After discussing about the problems encountered by the conventional digital distance relay, a new digital distance relaying scheme is presented, which compen
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