Self-adapting voltage quick-break protection method of distribution circuit
An adaptive voltage and quick-break protection technology, which is applied to emergency protection circuit devices, electrical components, etc., can solve problems such as long time delay and large amount of calculation
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[0054] The present invention will be further described below in conjunction with the accompanying drawings.
[0055] 1) Cooperate with the directional element, when the directional element judges that the fault occurs in the forward direction of the line, the directional element sends a signal to start the protection; when the directional element judges that the fault occurs in the reverse direction of the line, it sends out a signal to block the protection;
[0056] 2) After the protection starts, the line current and voltage are sampled at the place where the protection is installed; the effective value of the three-phase fault voltage component is obtained according to the sampling results of the three-phase voltage, and the fault phase is selected according to the effective value.
[0057] The basic idea of using voltage value for fault phase selection is: according to the sampling result u of the three-phase voltage at the measurement point mA (t), u mB (t) and u mC (...
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