Relay protection method for line-phase fault based on transition resistance measurement
A technology of transition resistance and relay protection, which is applied in the direction of emergency protection circuit devices and electrical components, etc., and can solve problems such as severe impact on action performance, refusal to operate, isolation of faulty lines and power grids, etc.
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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. figure 1 CVT is a voltage transformer, and CT is a current transformer. The protection device measures the fault phase-to-phase voltage of the transmission line at the protection installation of the m substation and fault phase-to-phase current Measure the fault phase-to-phase voltage of the transmission line at n substation protection installation and fault phase-to-phase current Among them, φφ=AB, BC, CA phase.
[0015] Protection device calculates active exchange power of transmission line
[0016] The protection device calculates the active power consumed by the transmission line Among them, z 1 is the positive sequence impedance of the transmission line per unit length; l is the length of the transmission line.
[0017] T...
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