Current through the transformer voltage signal sampled

Energy for each phase by measuring the current through the transformer voltage signal is sampled, and then through the differential amplifier circuit chip the voltage signal, and the amplified signals are electric transformerinto digital signals proportional thereto, and then through the high-pass filter to remove the signal into the DC component of an input of the digital multiplier. The power voltage signal is Circuit breaker the sampling resistor divider through the chip mcb circuit breaker circuit amplifies the signal, and then after converted into a digital signal proportional thereto, into the digital multiplier and the other input terminal of the signal multiplying current channel operation, the completion of the measurement of the instantaneous power measurement of electric energy. Instantaneous power output of each phase by the digital low-pass filter, an integration process, and then accumulates the absolute values ​​into the "digital / frequency" converter, through the frequency divider circuit output pulse to the CPU through the isolation unit for processing, were recorded the total active and reactive power and active reverse power.