The new phase-comparison principle is the main feature of the new distance relay.
全新的比相原理是新型距离继电器的主要特色。
The design concept and working principle of the system are discussed, and the key technologies including black-white bar coding, phase comparison modules and system control program are analyzed.
详细阐述了系统工作设计思想与工作原理，并对其中的关键技术黑白条形码编码方式、相位比较模块与系统控制程序等进行了详细分析。
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