DC Insulation Monitor
A technology of DC insulation and monitoring instrument, applied in the direction of instruments, measuring electricity, measuring devices, etc., can solve the problems of high price, zero-drift RMS submergence, low zero-drift leakage current sensor, etc., to reduce the overall cost and system cost. , the effect of reducing requirements
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[0009] figure 1 It is to use an embodiment of the present invention, a leakage current sensor is set on each DC branch, and a variable resistance bridge ( figure 1 Composed of R1, R2, R3, R4, S1, and S2), there is a voltage measurement circuit between the DC positive and negative poles and the ground, and the main controller is connected to the voltage measurement circuit, leakage current sensor, and resistance bridge (for clarity, figure 1 No connecting lines are drawn between them). figure 1 Among them, Rp and Rn are the ground leakage resistances on two different DC branches, they are the objects to be monitored by the system, and the corresponding Ip and In are their leakage currents to the ground. Vp and Vn are DC positive and negative voltages to ground. R2 and R3 in the resistance bridge are called balanced resistors, R1 and R4 are called unbalanced resistors, and S1 and S2 are unbalanced resistor switching switches. A variable resistance bridge between the DC positi...
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