Identically named fault phrase sequence diagnosis method of double-circuit lines on the same tower
A double-circuit line and diagnosis method technology, applied in the direction of the fault location, etc., can solve the problems that the protection device cannot be tripped correctly, the fault phase difference cannot be provided, and the power grid impacts, etc.
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[0015] Hereinafter, the present invention will be further described in conjunction with the drawings and embodiments.
[0016] figure 1 It is a schematic diagram of a power transmission system for parallel double-circuit lines on the same pole to which the present invention is applied. figure 1 PT is a voltage transformer, CT is a current transformer, z m It is the zero sequence mutual inductance between lines. The protection device measures the sudden change of the fault phase current at the I circuit protection installation of the double circuit line on the same pole And the abrupt change of phase current of fault at the installation of line protection Among them, φ is phase A or phase B or phase C;
[0017] The protection device calculates the sudden change of the fault phase current at the I circuit protection installation Leading II circuit protection installation of fault phase current mutation Angle
[0018] Protection device judgment And Whether it is true or not, if...
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Abstract
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