Intelligent low-voltage network comprehensive protection device
A technology of comprehensive protector and low-voltage power grid, which is applied in the protection of undervoltage or no voltage, the protection of overvoltage, and the protection of overcurrent. The action time is multi-level adjustable and multi-level adjustable, and it does not have the systematic management function of the low-voltage power grid network, etc.
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[0012] The present invention will be further described below in conjunction with the embodiments and accompanying drawings.
[0013] Such as figure 1 with figure 2 As shown, an intelligent low-voltage power grid comprehensive protector includes a plastic case circuit breaker, a power supply circuit, a leakage simulation circuit, a leakage detection circuit, a leakage amplification circuit, a voltage sampling circuit, an overvoltage and undervoltage comparison circuit, a current sampling circuit, an overvoltage Current comparison circuit, action value parameter setting circuit, single chip microcomputer (U4), LCD data display circuit, action state alarm indication circuit, communication interface (485), electric opening and closing control circuit.
[0014] Such as figure 1 As shown, the primary side of the transformer (T1, T2) is connected to the main circuit power supply side (N, LA, LB, LC), and the secondary side is rectified and filtered by four diodes (D1~D4) and six c...
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