Protection device of power supply line disconnection fault
A disconnection fault and protection device technology, applied in circuit devices, emergency protection devices with automatic disconnection, emergency protection circuit devices, etc., can solve problems such as failures can not be accurately detected, no control mechanism trip protection, etc., to achieve reliable performance. , avoid causing damage, the effect of simple system structure
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[0017] exist Figure 1-2 In the example shown:
[0018] The three-phase voltage stabilizing circuit includes transformer T1-3, diode D4-6, voltage stabilizing module U1-2 and varistor RY, wherein the primary coil of transformer T1-3 is connected to phase A, phase B, phase C and neutral line N , one end of the secondary coil is connected as the negative pole of the output power supply, and the other end corresponds to the input end of the voltage stabilization module U1 through the diode D4-6, the output end of the voltage stabilization module U1 is connected to the input end of the voltage stabilization module U2, and the voltage stabilization module U1- The third terminal of 2 is grounded, and the three-phase voltage stabilizing circuit can stably output 12V as the working power supply of the device under the condition of wide voltage fluctuation.
[0019] The three-phase voltage sampling circuit includes a diode D1-3 and a calibration resistor R1-3, wherein one end of the d...
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