Start-up protection method and device for commissioning of electric equipment
A technology for electrical equipment and protective devices, which is applied in the field of start-up protection for electrical equipment trial operation, can solve the problems of increased labor intensity, affecting work efficiency, and long time consumption, and achieves increased assembly time, convenient operation, and short wiring time Effect
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[0022] Such as figure 1 , 2 As shown, a start-up protection method for trial operation of electrical equipment is to use a start-up protection device 2N with current setting, delay, and execution for electrical equipment, and the working power supply +KM, -KM of the start-up protection device 2N , through the voltage conversion switch and the air switch 1ZK to the positive and negative power supply of the protective screen device.
[0023] The steps are as follows:
[0024] Ⅰ. Setting current, use A-phase current relay, B-phase current relay, C-phase current relay, D-phase zero-sequence current relay to set the current of electrical equipment;
[0025] Ⅱ. Delay the current signal with a set logic value ≥ 1, and transmit the delayed current signal to the executive tripping device; set the current with a logic value ≥ 1: when the three-phase current of A, B, and C is set to 5A current , the logic value is 1, and the A, B, C three-phase current is greater than 5A current, it i...
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