
2018年第39卷第3期
东北电力技术
NORTHEAST ELECTRIC POWER TECHNOLOGY
15
火电厂发变组接线方式的主变压器过励磁问题分析
王日升,王鹏?
(1.国家电投集团辽宁东方发电有限公司,辽宁抚顺113007; 2.国网辽宁省电力有限公司检修分公司,辽宁沈阳110003)
摘要:大容量火电机组通常采用发变组接线方式,增大了主变压器过励磁可能。过励磁将造成变压器局部发热、绝缘介质损坏、绝缘使用寿命降低等隐患,变压器过励磁多发生在发变组未与系统并列和事故情况下,运行人员在实际工作中应尽量避免变压器发生过励磁。
关键词:发变组:主变;局部过热;原因:措施
【中图分类号]TM621【文献标志码】A【文章编号]1004-7913(2018】03-0015-02
Analysis on Problems of Thermal Power Plant Generator Transformers
Wiring Way of Main Transformer Over Excitation
WANG Risheng', WANG Peng
(1. SPIC Liaoning Dongfang Power Company Co., Ltd., Fushun, Liaoning 113007, China;
2. State Grid Liaoning Maintenance Company,Shenyang,Liaoning 110003, China)
Abstract : Thermal power generators which have high capacity usually use transformer group wiring way to add the opportunity of main transformer over excitation. Over-excitation transformer will cause transformers. They are local fever, insulating mediums damaged. The insulation's service life is reduced and it may causes hidden problems. Transformer's over-exeitation occurred at transformer group is not parallel with the system and accident situations. In the actual work operating personnel it must try their best to make sure that over-exci-tation transformer has been avoid.
Key words: generator transformer group; main transformer; local overheat; reason; measure
21世纪以来,随着我国经济飞速发展,电力需求急速增加,大型火电机组增长较快,300MW、 600MW机组已成为我国各大电网的主力机组,由于上述容量发电机电压高,故不设发电机电压母线,通常采用发电机与双绕组变压器连接成的发变组接线。采用该接线方式的主变压器将增大过励磁的可能,这是由发变组单元接线方式所决定的,因为该接线方式的发电机、主变压器和高压厂用变压器直接组合在一起,发电机出口不设断路器,仅在发电机一变压器组高压侧设断路器。当主
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万方数据
变开关一旦与系统脱离,就会出现周波和电压均受发电机控制的情况,而当发电机脱离系统后,又很难控制,受调速系统和自动励磁调节装置的影响较大,变压器的电压和频率都可能偏离额定值较多,从而导致主变压器出现过励磁。实践证明,我国 200MW以上机组采用发变组接线的主变压器多次发生过励磁事件,给变压器和机组的安全运行带来不利影响。为了防止采用发变组接线的主变压器产生过励磁,对变压器过励磁的危害、产生原因及避免措施进行如下分析。
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作者简介:
孟祥麟(1997),女,主要研究方向为电气工程及其自动化。
(收稿日期2018-01-05)