Detection and identification system and method for short-circuit current of power system
A short-circuit current and identification system technology, applied in circuit devices, emergency protection circuit devices, overcurrent protection, etc., can solve the problems of slow detection response speed, affecting signal recognition time, etc., and achieve strong anti-electromagnetic interference ability Effect
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Embodiment 1
[0031] A power system short-circuit current detection and identification system, comprising: a power supply module and a sensing module, the sensing module is respectively electrically connected with a group of primary current transformers, a power supply module and a control module, the control module is connected to The liquid crystal display is electrically connected to the power module;
[0032] The sensing module includes a set of secondary current transformers correspondingly connected with the primary current transformers, the secondary current transformers are electrically connected with the A / D sampler, and the A / D sampling The NOR gate and the NOR gate are electrically connected through the comparator. The primary current transformer and the secondary current transformer can convert the high current signal on the power line into a voltage signal suitable for the use of the operational amplifier. The voltage signal is proportional to the high current signal. The ratio...
Embodiment 2
[0034] According to the power system short-circuit current detection and identification system according to Embodiment 1, the power module includes a transformer, the transformer is electrically connected to the AC filter, the AC filter is electrically connected to the rectifier bridge, and the rectifier The bridge is electrically connected to the DC / DC power circuit.
Embodiment 3
[0036] According to the power system short-circuit current detection and identification system according to Embodiment 1 or 2, one output end of the DC / DC power supply circuit outputs 12 VDC, and the other output end is electrically connected to the DC filter circuit, and the DC filter circuit outputs 5VDC, of which ±12V powers the sensing module, and 5V powers the control module.
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