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| Discussion of incomplete phase protection configurations on the HV side circuit breaker of generator-transformer unit |
| Shi Guixue |
| Datang Hydropower Science & Technology Research Institute Co., Ltd, Nanning 530007 |
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Abstract The damage of incomplete phase working conditions to generator and transformer is analyzed, the necessity of incomplete phase protection configuration is proposed, the current situation of incomplete phase protection configuration on the HV side circuit breaker of generator-transformer unit is introduced, the effect of relevant national standards on the current situation is analyzed, the cooperative relationship between circuit breaker failure protection and three-phase inconsistency protection is analyzed, the possibility of lacking of configuration of electrical capacity three-phase inconsistency protection leading to malfunction of failure protection is put forward, the cooperative relationship between circuit breaker anti-trip circuit and three-phase inconsistency protection is analyzed, and the possibility of lacking of configuration of electrical capacity three-phase inconsistency protection leading to failure to start anti-trip function when the circuit breaker trips locally is proposed. And finally, the improvement measures and strategies to solve the problems are put forward, especially the fixed value setting principle for action time of noumenal three-phase inconsistency protection under the different situations is analyzed and explained.
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Received: 21 March 2019
Published: 29 September 2019
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| Cite this article: |
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Shi Guixue. Discussion of incomplete phase protection configurations on the HV side circuit breaker of generator-transformer unit[J]. Electrical Engineering, 2019, 20(10): 99-102.
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http://dqjs.cesmedia.cn/EN/Y2019/V20/I10/99
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2019, Vol. 20 
