Short-circuit fault rapid elimination of a law Zhang Jin Category: S2 Document identification code: E For low-voltage line circuit faults, it is generally easier to find and eliminate. But for short-circuit faults, especially for long lines, short-circuit fault, usually the search method is The circuit is gradually disconnected and eliminated with a multimeter or power-on method. This method is difficult to find. After many years of experience, the author has mastered a method that does not disconnect the line and does not use a multimeter to judge the short-circuit fault, that is, using a clamp meter. To find the short circuit. As shown in the lower right, a large load (such as a 1000-watt electric furnace) is connected to the input (phase line) of the power supply to measure the current, and then the power is turned on. At this time, the line is in a short-circuit state. Basically, both sides of the load are dropped. From the short-circuit point to the load, a phase current passes through the line. In this way, a clamp ammeter can be used (the range is generally selected to be less than 10A). The presence and absence of current shall be used to determine and find the exact position of the fault point. The bisection method shall be used for the measurement, starting from the middle first. If there is a current measured and it is substantially equal to or close to the rated current of the load, then The short circuit point is outside the measurement point; if there is no current, it indicates that the short circuit point is within the measurement point. After determining which line the fault point is in, measure and judge from the middle of the line by the above method. This gradually reduces the scope of the fault point. This is the point of failure when looking for a demarcation point where there is no current. Author unit: Zhang Jin (Suyu County Power Supply Bureau, Jiangsu Province, 223800)
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