微型斷路器滅弧系統對短路分斷能力影響的研究
董愛麗
(北京北元電器有限公司,北京 101105)
摘 要:短路分斷能力是微型斷路器 (MCB) 的一項重要的技術指標,影響該指標的因素很多。通過對分斷試驗樣機燒蝕的情況——動觸頭引弧板頂部電弧停滯時間長、燒蝕嚴重及滅弧柵片未被有效利用進行分析,結合理論提出優化方案并進行試驗驗證,得出優化引弧板設計、滅弧室設計以及出氣口結構有利于縮短電弧停滯時間,加快電弧的引弧速度,提高柵片切弧利用率,以增加電弧電壓,進而提高 MCB 的分斷性能。
關鍵詞: 微型斷路器;短路分斷能力;引弧板;滅弧系統
中圖分類號:TM561 文獻標識碼:A 文章編號:1007-3175(2024)01-0050-05
Research on Effects of MCB Arcing Systems on the
Short-Circuit Breaking Capacity
DONG Ai-li
(Beijing Beiyuan Electric Appliance Co., Ltd, Beijing 101105, China)
Abstract: The short-circuit breaking capacity is an important technical index of Miniature Circuit Breakers(MCB), and there are many factors affecting this capacity. According to the analysis of the breaking experimental prototype burning, the arc plate top of movable contacts has long-time arc stagnation and serious ablation, and the arc extinguishing grid is not utilized efficiently, so this paper puts forward an optimization scheme based on some theories and makes the correspondent experimental verification. The optimized designs of arc plates, arc extinguishing chambers and air outlets are beneficial to shorten the arc stagnation time, increase the arc striking speed, improve the utilization rate of grid cutting arc to increase the arc voltage, thus improving the short-circuit breaking capacity of MCB.
Key words: miniature circuit breaker; short-circuit breaking capacity; arc plate; arc extinguishing system
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