660MW火电机组厂用电系统电气保护相互配合的应用分析

Application Analysis of Electrical Protection Coordination of 660 MW Thermal Power Unit Factory System

火力发电厂的继电保护和安全自动装置主要是涉网部分的线路保护、母线保护、断路器保护、安稳装置等以及单元机组的发变组保护、厂用电快切装置、厂用电综合保护装置及低压电气保护及自动装置等。除了与涉网保护相配合,发变组保护还要与励磁系统限制及保护相匹配,同高压厂用电和低压厂用电电气保护及自动装置进行配合。除此之外,直流及UPS系统的可靠运行也对整个发电厂设备的安全运行起着至关重要的作用。本文就660MW火电机组厂用系统电气保护的配合进行相关探讨。

The main relay protection and safety automatic devices in thermal power plants are line protection, bus protection, circuit breaker protection, safety device, transformer group protection of unit units, fast switching device of auxiliary power, comprehensive protection device of auxiliary power and low voltage electric protection and automatic device. In addition to networkrelated protection, generator-transformer unit protection should also be matched with excitation system restriction and protection, and with high-voltage and low-voltage auxiliary electrical protection and automatic devices. Besides, the reliable operation of DC and UPS systems also plays a vital role in the safe operation of the entire power plant equipment. In this paper, the coordination of electrical protection for 660 MW thermal power plant system is discussed.