摘要
首先介绍了变压器风冷控制系统的一、二次系统配置,然后针对风冷控制系统中多组风机并联运行的情况,提出了一种根据并联风机的总电流实现多机保护的定值整定方案。该方案在单机保护配置及其定值整定原则的基础上,根据N-1故障原则计算出各项保护功能的定值,详细分析了所提出定值的灵敏度,并设计了一系列测试用例对方案进行了测试。分析和测试结果表明,所提出的方案兼顾了可靠性和灵敏性,能够满足多台电动机并列运行时对各项保护功能的需求,在变压器风冷控制系统的电动机保护中具有实用价值。
The primary and secondary system configuration of a transformer air cooling control system is firstly introduced, and then aiming at the circumstance of multiple fan motors running in parallel in an air cooling control system, a new setting calculation scheme is proposed for multiple motors protection by using the total current of multiple motors. According to N-1 fault principle, setting values of each protection function are calculated in the new scheme based on the protection function configuration and its setting principle of a single motor relay. The sensitivity of all calculated setting values is analyzed in detail and the test is carried out by using a series of testing cases. The analysis and test result indicates that the new scheme has both high reliability and high sensitivity which can meet the demands of various protection functions for multiple motors in parallel operation, and also has certain practical value for motor protection in a transformer air cooling control system.
出处
《电力系统保护与控制》
EI
CSCD
北大核心
2016年第19期133-137,共5页
Power System Protection and Control
关键词
风冷控制系统
电动机保护
定值整定
变压器
多机
air cooling control system
motor protection
setting value calculation
transformer
multiple motors
