基于同步合成技术的站用交流系统剩余电流监测方法

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Abstract Traditional residual current monitoring methods exhibit errors exceeding 30% under neutral line parallel topology configurations and lack early-warning capabilities. In order to enhance the real-time perception of insulation status in station AC power systems and overcome the inherent monitoring error challenge caused by dual-power common-zero design, this study proposes a residual current monitoring method based on synchronization synthesis technology. Precise synchronization of all slave data acquisition devices across intervals is achieved through customized differential synchronization signals, with time delay errors controlled within 40 microseconds. Based on a layered architecture design, the dynamic phasor resultant synthesis algorithm is utilized to eliminate the neutral current shunting error caused by the dual-power common-zero configuration, accurately restore the true residual current. By dynamically setting alert thresholds, the intelligent terminal triggers circuit breaker tripping. The introduction of a dynamic temperature compensation algorithm counteracts the frequency drift of crystal oscillators, ensuring long-term synchronization accuracy. Deployment validation in a typical 220 kV substation demonstrates that the residual current monitoring error in the AC system is reduced to within 1%, with fault location precision improved to 0.1 m, and troubleshooting efficiency increased by 80%. The monitoring system automatically generates insulation status reports, replacing manual inspections and enabling intelligent operation and maintenance processes.

Key words： insulation monitoring phasor synthesis temperature compensation hierarchical monitoring response delay threshold interlock

Received: 04 August 2025

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	Articles by authors
	ZHAO Peng
	HOU Zhihui
	BA Tu
	LI Huiqiang
	PAN Zhijian

Cite this article:

ZHAO Peng,HOU Zhihui,BA Tu等. Residual current monitoring method for AC power systems in substations based on synchronization synthesis technology[J]. Electrical Engineering, 2026, 27(3): 70-76.

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https://dqjs.cesmedia.cn/EN/Y2026/V27/I3/70

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