数字式备自投装置在水电厂的应用

水口水电厂厂用电400 V备用电源自动投入装置(简称备自投)由常规的电磁型继电器构成,采用可编程NEP 9808A数字式备自投装置实施技术改造。改造时充分考虑引入到备自投装置的接入量,对控制程序进行合理的逻辑设计,实现母联互投、进线1恢复、进线2恢复3种备自投动作方式和过电流保护动作闭锁备自投功能。根据继电保护整定计算原则和水电厂实际情况,对整定项目进行整定计算。按照回路原理和功能,进行现场调试、回路试验。装置设计简单,现场便于维护,能够监视外部开入回路,具有通信功能,动作可靠性高。NEP 9808A数字式备自投装置投入运行1年来,动作成功率达到100%。

Application of digital automatic bus transfer equipment in hydraulic power plant

The programmable digital NEP 9808A automatic bus transfer equipment is used for 400 V auxiliary power to replace the original one composed of normal electromagnetic relays in the retrofitting of Shuikou hydraulic power plant.With full consideration of the input quantity to automatic bus transfer equipment,the control logic is designed rationally to realize three automatic transfer modes:interconnection of bus coupler,recovery of inlet feeder 1 and recovery of inlet feeder 2.The settings are re-calculated according to protection setting calculation principles and practical operating con-ditions and the site test is carried out for different circuits according to their principles and functions.The equipment has simple structure and high reliability and monitors binary inputs.It has communication function and its maintenance is convenient.The equipment has been operated on site for one year and its success ratio reaches 100 %.