A method and device for judging the direction of a high-resistance fault on a transmission line
A high-resistance fault and transmission line technology, applied in emergency protection circuit devices, fault locations, measuring devices, etc., can solve the problems of low grounding current and great difficulty in high-resistance faults, and achieve fast response speed and small amount of calculation. Effect
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[0039] In the following, an embodiment of a method and device for judging the direction of a high-resistance fault of a transmission line proposed by the present invention will be described in detail in conjunction with the accompanying drawings.
[0040] The transmission line model applying the method of the present invention is as figure 1As shown, the length of the line PM is 100km, the length of the line MN is 200km, and the length of the line NQ is 100km. The transmission line parameter values and system impedance values are shown in Table 1 and Table 2. E M and E N 1.1062 times and 1.1069 times the rated voltage respectively, E N 44° behind. The device of the invention measures the voltage and zero-sequence current value at the protection installation place through a voltage transformer (PT) and a current transformer (CT). Suppose F in the figure 3 A high-resistance arc fault occurs at point A, the arc length is 20cm, the tower base resistance is set to 1000Ω, an...
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