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ID:13131612
大小:1.65 MB
页数:106页
时间:2018-07-20
《微机发电机失磁保护技术的研究》由会员上传分享,免费在线阅读,更多相关内容在教育资源-天天文库。
1、华北电力大学(北京)硕士学位论文微机发电机失磁保护技术的研究姓名:王栋一申请学位级别:硕士专业:电力系统及其自动化指导教师:刘建飞20041220华北电力大学(北京)硕士学位论文摘要 随着电力工业的发展,大型发电机组在电力系统中的地位越来越重要,大机组的故障或突然切除,会给电力系统带来很大影响。 在发电机的各种保护中,发电机失磁保护是一个急待研究和完善的课题。本文在详细分析失磁保护机理的基础上,对现有的各种保护方案进行了深入的探讨,提出了四种典型的失磁保护新方案,能够满足用户的各种需要,并方便了用户的使用。该新方案对于由励磁
2、绕组内部开路而引起的转子判据拒动问题,提出增加逆无功闭锁的阻抗判据,避免了失磁保护的拒动,并且由于增加了逆无功元件,加长了延时,提高了可靠性。关键词:发电机,失磁保护,微机保护ABSTRACT With the development of power industry, the large generator-transformer units playmore important roles in power system. There are significant effects to power systemwhen l
3、arge generator-transformer units are faulting or suddenly cut off. Among all types of protection for generator, loss of excitation protection is a subjectcalling for immediate study. This paper put forward four typical schemes in loss of excitationprotection, which
4、can meet the various needs of users and facilitate the using. The authorargues that by increasing reverse reactive power closedown impedance criterion. The schemescan effectively avoid miss trip of the loss of excitation protection caused by exciting windinginside open c
5、ircuit. On the same time, by adding anti-passive power component, the timedelay is prolonged and reliability is enforced.Wang Dongyi(electric power system and its automation)Directed by pro#Liu JianfeiKEY WORDS. generator, loss of excitation protection, microprocessor
6、-basedprotection华北电力大学(北京)硕士学位论文摘要 随着电力工业的发展,大型发电机组在电力系统中的地位越来越重要,大机组的故障或突然切除,会给电力系统带来很大影响。 在发电机的各种保护中,发电机失磁保护是一个急待研究和完善的课题。本文在详细分析失磁保护机理的基础上,对现有的各种保护方案进行了深入的探讨,提出了四种典型的失磁保护新方案,能够满足用户的各种需要,并方便了用户的使用。该新方案对于由励磁绕组内部开路而引起的转子判据拒动问题,提出增加逆无功闭锁的阻抗判据,避免了失磁保护的拒动,并且由于增加了逆无功元件
7、,加长了延时,提高了可靠性。关键词:发电机,失磁保护,微机保护ABSTRACT With the development of power industry, the large generator-transformer units playmore important roles in power system. There are significant effects to power systemwhen large generator-transformer units are faulting or suddenly
8、 cut off. Among all types of protection for generator, loss of excitation protection is a subjectca
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