The electric parameter acquisition system takes STM32F103ZET6 single chip microcomputer as the main control MCU, obtains the change characteristic parameters of the mains power lines through voltage and current transformers, converts them into weak current parameters, performs analog-to-digital conversion through STM32 internal ADC, and obtains the required electric quantity parameters through a series of numerical calculations and corresponding algorithms.

ADP3301 converts 5V to 3.3V, which is used as the main control power supply of STM32 chip.
The reference voltage chip adr441 supplies power to the operational amplifier AD7654 in the signal amplification board.
AD7654 outputs 1V sinusoidal AC signal. Conversion time is 10 μ s. The sampling period is 156.25 μ S.
Conversion time is 10 μ s. The sampling period is 156.25 μ S.
The phase difference can be obtained in the double-D trigger 74HC74. The STM32 single chip microcomputer obtains the current phase difference through timer capture.
Sinusoidal signal waveform is converted into corresponding square wave signal by LM393 voltage comparator.
MAX706 constitutes a monitoring circuit, which is networked through PHY chips bcm5221 and 88e3082, and the fault is remotely controllable.

It is used to accurately measure the rapidly rising pulse current, and the highest peak current can be measured 100kA.
The communication mode of optical fiber transmission has good safety performance and anti-interference ability.
The pulse current sensor is connected in series to the measuring circuit to measure the pulse current. At the same time, the measured analog signal is converted into digital signal and transmitted to the digital host through optical fiber for data processing, 

display and storage.
The pulse current sensor is powered by AC220 isolated power supply.
Based on optical fiber transmission, the electrical connection between the control end and the measurement end is completely cut off to ensure the safety of workers.
4us response time to restore the measured signal to the maximum extent.