特高壓固定串補控保系統(tǒng)光隔端子故障分析及改進
劉濤1,李鳳旭2,魯盼1,喬振朋1,楊征1
(1 國網(wǎng)河南省電力公司直流中心,河南 鄭州 450051;
2 華能(浙江)能源開發(fā)有限公司玉環(huán)分公司,浙江 玉環(huán) 317604)
摘 要:介紹了某特高壓串補工程控保系統(tǒng) 220 V 光隔端子發(fā)生的兩次危急缺陷,指出該工程現(xiàn)場運用的數(shù)百個同型號產(chǎn)品均有類似故障的可能。對該型光隔電路進行電氣分析和熱分析,認為部分元件功耗偏大、布局集中、散熱設計不合理是導致故障的根本原因。提出降低輸入電流以減小功耗同時改善散熱布置的改進方案。試驗證明改進后的光隔端子運行可靠性顯著提升,滿足工程需求。
關(guān)鍵詞: 特高壓串補;控保系統(tǒng);光隔端子;散熱
中圖分類號:TM723 ;O433.1 文獻標識碼:B 文章編號:1007-3175(2023)03-030-04
Fault Analysis and Improvement of Optical Isolated Terminals in UHV
Series Compensation Control and Protection System
LIU Tao1, LI Feng-xu2, LU Pan1, QIAO Zhen-peng1, YANG Zheng1
(1 State Grid Henan DC Center, Zhengzhou 450051, China;
2 Huaneng(Zhejiang) Energy Development Co., Ltd. Yuhuan Branch, Yuhuan 317604,China)
Abstract: Two defects of 220 V optical isolated terminals happening in the control and protection system of an UHV series compensation project are introduced, and the possibility of similar defects occurring to hundreds of products with the same model used in this project is pointed out. After making electrical and thermal analysis of the optical isolated circuit, the authors think that the root causes of these defects are the large power consumption, centralized layout and unreasonable heat dissipation design of some elements. Therefore, an improved scheme to decrease power consumption by reducing input currents and to optimize heat dissipation layout is proposed. Tests show that the improved optical isolated terminals can have better operation reliability and meet the engineering requirements.
Key words: UHV series compensation; control and protection system; optical isolated terminal; heat dissipation
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