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This may be misinter- preted as a fault and the relay would trip the line unnecessarily.
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As a consequence, the apparent impedance seen by a distance relay may fall within its operating zone. System disturbances, such as line switching following the fault, generator disconnection, and switching ON / OFF large loads cause oscillations in rotor angles among generators and can result in severe power- fl ow swings. Power system at steady operation maintains a balance be- tween the generation and load. However, a series capacitor in a line introduces protection problems –. To ful fi ll such requirements, the inclusion of a series capacitor in long transmission lines is increasing day by day. I NTRODUCTION R ECENT regulatory developments, increased electricity demand, and restrictions on building new transmission lines result in enhanced transmission-line loading and neces- sitate optimized operation of transmission networks. Index Terms- Digital relaying, distance protection, fault detec- tion, power swing, series compensation. The method is compared with available tech- niques and found to be accurate and fast. Different types of faults: symmetrical, asymmetrical, and high resistance occurring during the power swing are simulated through EMTDC/PSCAD to test the algorithm. The technique is tested for different series-compensated sys- tems including a 9-bus 3-machine power system. This paper pro- poses a negative-sequence current-based technique for detecting all types of faults during the power swing in a series-compensated line. The detection of fault in a series-compensated line during the power swing is further com- plicated due to complex transients produced by series capacitor and the metal–oxide varistor (MOV) protecting it. How- ever, if a fault occurs during power swing, the relay should detect the fault and trip as soon as possible. To avoid unintended trip operation during such conditions, a power swing blocking function is utilized in distance relays. 2, APRIL 2013 A Fault Detection Technique for the Series-Compensated Line During Power Swing Paresh Kumar Nayak, Ashok Kumar Pradhan, Senior Member, IEEE, and Prabodh Bajpai, Member, IEEE Abstract- A distance relaying scheme is susceptible to power swing. 714 IEEE TRANSACTIONS ON POWER DELIVERY, VOL.
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