Mr. Yongzheng Zhu Profile

Yongzheng Zhu

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Proceedings Article | 4 March 2024 Paper

Research on secondary signal acquisition system for instrument transformers based on time synchronization technology

Zemin Qu, Chen Hu, Yongzheng Zhu, Chaojun Ma, Yang Jiao

Proceedings Volume 12981, 129811X (2024) https://doi.org/10.1117/12.3014761

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To realize the online monitoring and condition assessment of transformers in a substation, synchronous acquisition of the secondary signals from multiple interval transformers across the entire station is required. A signal acquisition system has been designed, consisting of a time synchronization unit, a signal conditioning unit, a data acquisition unit, and a host computer. The time synchronization unit synchronizes the secondary signals from multiple interval transformers. The signal conditioning unit converts the output signals from the transformers into low-voltage signals. The data acquisition unit controls the sampling timing of the analog-to-digital converter (ADC) using FPGA and reduces phase errors through a time-digital-converter-based ADC sampling delay compensation method. The host computer employs the FFT algorithm with a fourth-order Blackman-Harris window to calculate the amplitude and initial phase of the secondary signals. The test results demonstrate that the system's error meets the requirement of a 0.05-class accuracy. The measurement errors between different channels and different data acquisition units are all less than 0.05%

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