Composite Differential Protection Method for Transmission Lines Resisting Current Reversal Effect
A transmission line and current technology, applied to emergency protection circuit devices, electrical components, etc., can solve problems such as differential current reduction, overheating and fuse of transmission lines, and unsatisfied current differential protection criteria
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[0013] The technical solution of the present invention will be further described in detail according to the accompanying drawings.
[0014] figure 1 It is a schematic diagram of the line transmission system applying the present invention. The protection device measures the A-phase voltage of the transmission line at the protective installation of the m substation when the transmission line is in normal operation B phase voltage C phase voltage Measure the A-phase voltage of the transmission line at the protective installation of n substation when the transmission line is in normal operation B phase voltage C phase voltage
[0015] The protection device measures the A-phase current of the transmission line at the protective installation of the m substation after the transmission line fails B-phase current C-phase current Measure the A-phase current of the transmission line at the protective installation of the n substation after the transmission line fails B...
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