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New approach to adaptive single pole auto-reclosing of power transmission lines

New approach to adaptive single pole auto-reclosing of power transmission lines

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In this study, a novel digital algorithm is introduced for recognition of arcing (transient) faults and determination of dead time for adaptive auto-reclosing. The algorithm distinguishes between arcing and permanent faults by using the zero sequence voltage measured at the relaying point. If the fault is recognised as an arcing fault, then the third harmonic of the zero sequence voltage is used to evaluate the extinction time of secondary arc and to initiate reclosing signal. The proposed algorithm uses an adaptive threshold level and therefore no significant adjustment is needed for different transmission systems. Moreover, its performance is independent to fault location, line parameters and the system pre-fault operating conditions. The algorithm has been successfully tested for various faults and operating conditions on a 400 kV overhead line using the electro-magnetic transient program (EMTP). The test results have demonstrated validity of the algorithm in determining the secondary arc extinction time and blocking unsuccessful automatic reclosing during permanent faults.

Inspec keywords: fault location; EMTP; power transmission lines

Other keywords: adaptive threshold level; electro-magnetic transient program; arcing faults; power transmission lines; transient faults; voltage 400 kV; system pre-fault operating conditions; line parameters; adaptive single pole auto-reclosing; EMTP; zero sequence voltage; fault location

Subjects: Power transmission, distribution and supply; Power system protection

References

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