摘要
介绍了GE公司制造的膨胀机(131-JX)—发电机(131-JG)的工作原理,着重分析了异步发电机的投入励磁。与同步发电机相比,异步发电机的并网发电过程更加简洁可靠,且具有较高的灵活性。此外,还对继电保护设置提出了改进措施:修改了接地故障保护的定值;将原有定时限零序过流改为反时限过流;为保证零序过流保护的灵敏性,降低了保护起动值,增加了延时时间。
The operational principle of GE Expansion Machine （131-JG）-generator （131-JG） was introduced with emphasis on the analysis of asynchronous generator exciting. Comparing with synchronous generation, the generation process incorporating in power network of asynchronous generator was simpler and more reliable and flexible. The improving measures of relay protective unit was proposed： the setting value for grounding failure protection was revised; the former definite time-delay zero sequence over-current was changed to inverse time-delay over-current; reducing the protection actuating value, increasing time-delay to ensure the sensibility of zero sequence over-current protection.
出处
《电机与控制应用》
北大核心
2006年第11期54-56,共3页
Electric machines & control application
关键词
异步发电机
同步速率
励磁涌流
零序电流
asynchronous generator
synchronous speed
exciting surge
zero sequence current
