The wiring method of voltage sensor

Different from the current sensor, when the voltage is measured, the primary winding of the voltage sensor is connected to a current limiting resistor R1 in series, and then connected in parallel to the measured voltage U1 to obtain a current I1 proportional to the measured voltage U1. The secondary side principle is the same as the current sensor. When the compensation current I2 flows through the measuring resistor RM, it is converted into a voltage across the RM as the measured voltage U0 of the sensor, ie U0=I2RM.