Power transmission line overload false operation prevention phase-to-phase distance backup protection method
A technology of phase-to-phase distance and transmission line, applied in the direction of emergency protection circuit devices, electrical components, etc., can solve the problems that the impact of impedance distance protection action performance cannot be ignored, hidden dangers of power grid safety, and impedance distance protection overrunning, etc., to prevent power grid flow Large transfer, fast protection action, enhanced safety and stability
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[0020] The technical solution of the present invention will be further described in detail below according to the drawings of the specification.
[0021] figure 1 In order to implement the method of the present invention, the protection device samples the voltage waveform of the voltage transformer PT and the current waveform of the current transformer CT at the location where the protection of the transmission line is installed to obtain the instantaneous values of voltage and current. The inner leaf algorithm calculates the phase-to-phase voltage of the fault at the protection installation of the transmission line Negative sequence current between fault phases And fault phase current Among them, φφ is AB phase or BC phase or CA phase.
[0022] The protection device calculates the voltage drop along the transmission line
[0023] Δ U · = Re ( U · φφ ) Im ( z 1 I · φφ ) - Im ( U · φφ ) Re ( z ...
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