抽屜式框架斷路器橋型觸頭的關(guān)鍵技術(shù)研究
潘璇，李軍，陳大江，王忠
（南京大全電氣研究院有限公司，江蘇 南京 211100）
摘 要：橋型觸頭是抽屜式斷路器的重要部件，研究了橋型觸頭的操作力及動(dòng)、熱穩(wěn)定性，通過(guò)簡(jiǎn)化彈簧片為等強(qiáng)度梁以及對(duì)工作狀態(tài)進(jìn)行力學(xué)分析，得出正壓力和插入力的計(jì)算公式及關(guān)系，并通過(guò)試驗(yàn)中正壓力與拔出力的測(cè)試得到經(jīng)驗(yàn)?zāi)Σ料禂?shù)。利用導(dǎo)電觸橋模型描述U 型排與橋型觸頭之間的接觸情形，計(jì)算二者之間的洛倫茲力、霍姆力、接觸電阻及溫升，得出校驗(yàn)其動(dòng)穩(wěn)定性與熱穩(wěn)定性的理論計(jì)算方法，為橋型觸頭的設(shè)計(jì)提供了思路。
關(guān)鍵詞：橋型觸頭；插入力；動(dòng)穩(wěn)定性；熱穩(wěn)定性
中圖分類(lèi)號(hào)：TM561 文獻(xiàn)標(biāo)識(shí)碼：A 文章編號(hào)：1007-3175(2017)03-0038-04
Key Technique Research of Bridge-Type Contact in Withdrawable Air Circuit Breaker
PAN Xuan, LI Jun, CHEN Da-jiang, WANG Zhong
（Nanjing Daqo Electrical Institute Co., Ltd, Nanjing 2111 00, China）
Abstract: The bridge-type contact is the important part of withdrawable air circuit breaker. This paper researched the operating force, dynamic stability and thermal stability of bridge-type contacts. The spring plate was simplified as the constant strength girder and the mechanical analysis was carried out for working condition to obtain the computational formulas and relationship between forward force and inserting force. The experienced friction coefficient was got by testing forward force and extraction force. The contact situation between U-type busbar and bridgetype contact was described by using the conductive contact bridge model. This paper calculated Lorentz force, Holm force, contact resistance and temperature rise between both of them and obtained the theoretical calculation method to examine its dynamic stability and thermal stability, which provides the design thought for the bridge-type contact.
Key words: bridge-type contact; insertion force; dynamic stability; thermal stability
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