A method and device for locating a ground fault in a distribution line
A technology for power distribution lines and grounding faults, which is applied to fault locations, measuring devices, and fault detection according to conductor types. , Fast fault location effect
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Embodiment 1
[0053] figure 1 The flow chart of the method for locating the ground fault of the distribution line provided in Embodiment 1 of the present invention is as follows: figure 1 As shown, the method for locating the ground fault of a distribution line provided by this embodiment includes the following steps:
[0054] Step 101: isolate the user-side transformer from the distribution line;
[0055] Step 102: inject a DC high voltage signal into the power distribution line, and determine the faulty phase according to the current value of each phase;
[0056] Step 103: Determine the grounding resistance of the faulty phase according to the faulty phase current and the injected high-voltage DC signal;
[0057] Step 104: Inject an AC high voltage signal into the power distribution line, and calculate the prediction of the distance from the fault point to the injection point of the AC high voltage signal according to the injected voltage, current, and capacitor current of the high volt...
Embodiment 2
[0077] figure 2 The flow chart of the method for locating the ground fault of the distribution line provided in Embodiment 2 of the present invention is as follows: figure 2 As shown, the method for locating the ground fault of a distribution line provided by this embodiment includes the following steps:
[0078] Step 201: isolate the user-side transformer from the distribution line;
[0079] Step 202: inject a DC high voltage signal into the power distribution line, and determine the faulty phase according to the current value of each phase;
[0080] Step 203: Take the signal injection point of the distribution line as the starting point of the line, and perform a dichotomy step, the dichotomy step includes: measuring the current value of the faulty phase at the middle point of the line, and judging the current value at the measurement point Is it zero? If the current value at the measurement point is zero, it means that the fault point is located in the front-end line of...
Embodiment 3
[0090] image 3 The flow chart of the method for locating the ground fault of the distribution line provided in Embodiment 3 of the present invention is as follows: image 3 As shown, the method for locating the ground fault of a distribution line provided by this embodiment includes the following steps:
[0091] Step 301: Isolate the user-side transformer from the distribution line;
[0092] Step 302: inject a high-voltage AC signal into the middle point of the power distribution line;
[0093] Step 303: measure the current value on both sides of the injection point;
[0094] Step 304: Determine whether the difference between the current values on both sides is less than a set value, and the set value is set by those skilled in the art according to the actual situation;
[0095] Step 305: If yes, the line is not faulty;
[0096] Step 306: If no, it means that the fault is located on the side with the larger current value, check whether there is a fault on the side with ...
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