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上海人民電器廠說說斷路器的工作原理

2021/1/29 15:09:02      點擊:
斷路器的工作原理如下:
當短路時,大電流,一般是10倍至12倍,產生的磁場客服反彈力彈簧,脫扣器拉動操作機構動作,開關瞬時跳閘。當過載時,電流變大,大熱量加劇,雙金屬片變形到一定程度推動機構動作,電流越大,動作時間越短。
漏電保護器的主要部件是個磁環感應器,火線和零線采用并列繞法在磁環上纏繞幾圈,在磁環上還有個次級線圈。當同一相的火線和零線在正常工作時,電流產生的磁通正好抵銷,在次級線圈不會感應出電壓。
如果某一線有漏電,或未接零線,在磁環中通過的火線和零線的電流就會不平衡,而產生穿過磁環的磁通,在次級線圈中感應出電壓,通過電磁鐵使脫扣器動作跳閘。
低壓斷路器也稱為自動空氣開關,可用來接通和分斷負載電路,也可用來控制不頻繁起動的電動機。它功能相當于閘刀開關、過電流繼電器、失壓繼電器、熱繼電器及漏電保護器等電器部分或全部的功能總和,是低壓配電網中一種重要的保護電器。
低壓斷路器具有多種保護功能(過載、短路、欠電壓保護等)、動作值可調、分斷能力高、操作方便、安全等優點,所以被廣泛應用。結構和工作原理低壓斷路器由操作機構、觸點、保護裝置(各種脫扣器)、滅弧系統等組成
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