Small current earthing wire selection protection apparatus and protection method based on GPRS
A technology of small current grounding and protection devices, which is applied to emergency protection circuit devices, fault locations, electrical components, etc., can solve problems such as unbalanced current of zero-sequence current transformers, influence of operation mode, and instability of discrimination, and achieve reliability Strong, high accuracy, improved recognition accuracy and real-time effect
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[0046] The device of the present invention constitutes as figure 1 As shown, it is composed of a power supply module, a power signal acquisition module, a display module, a switch output module, a single-chip microcomputer module and a communication module. It is connected with the single-chip microcomputer module by two wires, and the communication module and the GPRS module are connected by RS232.
[0047] Power modules such as image 3 shown. It is obtained from the secondary side of the line current transformer CT through the current-voltage transformer. The current on the secondary side of the line CT flows into a 5VA miniature current transformer CT3 inside the power module. When the secondary side of the miniature CT3 is open, its voltage is saturated, and The size is basically unchanged; the power module obtains the current on the secondary side of the current transformer of the power signal acquisition module through the current transformer CT3, and passes through ...
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