火电厂发变组接线方式的主变压器过励磁问题分析

Analysis on Problems of Thermal Power Plant Generator Transformers Wiring Way of Main Transformer Over Excitation

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。

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？excitation 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？excitation transformer has been avoid.