Method for preventing high tension power line single phase coinciding with permanent fault
A technology for permanent faults and high-voltage transmission lines, which is applied to the protection of fault currents, electrical components, emergency protection circuit devices, etc., and can solve problems such as the inability to judge disconnection of phase insulation and the inability to guarantee single-phase automatic reclosing , to avoid the impact of short-circuit current
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[0014] Field application of the patent of the present invention: when a single-phase grounding fault occurs during the operation of a high-voltage transmission line, an ultra-high-voltage transmission line or an ultra-high-voltage transmission line, the existing relay protection equipment can disconnect the circuit breakers on both sides of the faulty phase; Before the single-phase reclosing can be implemented, close the grounding switch through the automatic reclosing device, and short-circuit part of the reactance through the damping resistor; the automatic reclosing device detects the voltage of the disconnected phase, if the voltage amplitude can reach the set value, it means The insulation level of the disconnected phase has been restored, and single-phase reclosing can be implemented; if the amplitude of the voltage does not reach the set value, it means that the insulation level of the disconnected phase is low, and it is not suitable to implement single-phase reclosing. ...
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