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Subject: Electrical Engineering × Author: Bisht, Dinesh Singh × End date: 2019 ×
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    ThesisItemOpen Access
    Advanced directional relaying schemes for series compensated transmission lines and distribution networks
    (G.B. Pant University of Agriculture and Technology, Pantnagar - 263145 (Uttarakhand), 2019-07) Bisht, Dinesh Singh; Saxena, Ravi
    In integrated power systems the direction of fault current is not fixed. A reliable, effective and versatile directional relaying is therefore very important. Voltage and current inversion in series compensated lines leads to mal-operation of conventional directional relays. In distribution lines where potential transformer is generally absent, conventional directional relays cannot be used. This thesis presents two modified directional relaying schemes to address these shortcomings. First scheme utilise the phase change in positive sequence current and magnitude change in positive sequence voltage at fault and pre-fault conditions. It is evaluated through MATLAB simulation for a series compensated line and its performance is compared with conventional directional relaying for different type of fault. This proposed scheme addresses the problems of voltage and current inversion faced in conventional directional relaying. The second scheme utilise only the post fault current to estimate the fault direction. Hence, it is an attractive method of directional relaying in distribution networks but equally applicable for transmission lines. Performance of this technique was assessed using simulated models of transmission and distribution lines on MATLAB for different operating conditions; like change in the power flow direction, effect of fault resistance, effect of fault location, level of compensation etc.