微型斷路器滅弧系統(tǒng)對(duì)短路分?jǐn)嗄芰τ绊懙难芯?/strong>
董愛(ài)麗
(北京北元電器有限公司，北京 101105)
摘 要：短路分?jǐn)嗄芰κ俏⑿蛿嗦菲?(MCB) 的一項(xiàng)重要的技術(shù)指標(biāo)，影響該指標(biāo)的因素很多。通過(guò)對(duì)分?jǐn)嘣囼?yàn)樣機(jī)燒蝕的情況——動(dòng)觸頭引弧板頂部電弧停滯時(shí)間長(zhǎng)、燒蝕嚴(yán)重及滅弧柵片未被有效利用進(jìn)行分析，結(jié)合理論提出優(yōu)化方案并進(jìn)行試驗(yàn)驗(yàn)證，得出優(yōu)化引弧板設(shè)計(jì)、滅弧室設(shè)計(jì)以及出氣口結(jié)構(gòu)有利于縮短電弧停滯時(shí)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(jìn)而提高 MCB 的分?jǐn)嘈阅堋?/span>
關(guān)鍵詞： 微型斷路器；短路分?jǐn)嗄芰?；引弧板；滅弧系統(tǒng)
中圖分類(lèi)號(hào)：TM561 文獻(xiàn)標(biāo)識(shí)碼：A 文章編號(hào)：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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