Summary of wire and cable equipment
Time of issue:
2019-06-08
Under the same conditions, the time needed for the change rate of short-circuit current of wire equipment to exceed the maximum value under normal conditions is obviously shorter than the time needed for the amplitude of short-circuit current of wire equipment to exceed the maximum value under normal conditions.
Under the same conditions, the time needed for the change rate of short-circuit current of wire equipment to exceed the maximum value under normal conditions is obviously shorter than the time needed for the amplitude of short-circuit current of wire equipment to exceed the maximum value under normal conditions. When the short circuit fault occurs in the power supply system of coal mine, the short circuit fault can be quickly judged by the current change rate of wire and cable equipment, which can ensure the electrical safety of coal mine. As far as the speed of short-circuit fault is concerned, the method of detecting the change rate of short-circuit current is faster than the method of judging the current amplitude.
Under all kinds of short-circuit fault conditions, the value of short-circuit current change rate of wire equipment can exceed the maximum value of current change rate under normal conditions within 2ms, and the phase angle of short-circuit connection of wire and cable equipment is 0. And 180. However, the detection time is still significantly shorter than that of current amplitude. If the appropriate setting of coal mine relay protection is adopted, the short-circuit detection method based on current change rate can meet the requirements of fast short-circuit detection and protection of coal mine power supply system.
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