Phasor Product Active Work Method to Judgment Fault Phase and Line Selection Method
A line selection method and a technology for faulty phases, applied in the direction of the fault location, etc., can solve the problems of short circuit, electrical equipment insulation threat, inability to remove faulty lines, etc.
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[0092] In this embodiment, the phasor product active method is used to judge the fault phase and the line selection method is:
[0093] Phasor The function expression u E (t) is: u E (t)=Ksin(ωt+α), phasor The function expression u F (t) is: u F (t)=Psin(ωt+α+β), K and P are phasors respectively sum phasor The modulus of , α and α+β are phasors respectively sum phasor The phase angle of , β is the phasor sum phasor the included angle;
[0094] will phasor sum phasor phasor product recorded as Phasor product The active power of the phasor product is recorded as W E*F , the phasor product The function expression of is denoted as g(t);
[0095] W E*F =KPcosβ
[0096] g(t)=W E*F -KPsin(2ωt+2α+β)
[0097] Phasor product The period of is the phasor sum phasor One-half of , so the phasor sum phasor The half cycle of is the phasor product One cycle, so half a cycle or multiples of half a cycle:
[0098]
[0099] therefore
[0100] ...
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