INICT03A
INICT03A
INICT03A
仲鑫達自動化-您身邊的工業自動化備件專家
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熱繼電器的主要技術數據是整定電流。整定電流是指長期通過發熱元件而不致使熱繼電器動作的電流。當發熱元件中通過的電流超過整定電流值的20%時,熱繼電器應在20分鐘內動作。熱繼電器的整定電流大小可通過整定電流旋鈕來改變。選用和整定熱繼電器時要使整定電流值與電動機的額定電流一致。
由於熱繼電器是受熱而動作的,熱慣性較大,因而即使通過發熱元件的電流短時間內超過整定電流幾倍,熱繼電器也不會立即動作。只有這樣,在電動機起動時熱繼電器才不會因起動電流大而動作,否則電動機將無法起動。反之,如果電流超過整定電流不多,但時間一長也會動作。由此可見,熱繼電器與熔斷器的作用是不同的,熱繼電器只能作過載保護而不能作短路保護,而熔斷器則只能作短路保護而不能作過載保護。在一個較完善的控制電路中,特別是容量較大的電動機中,這兩種保護都應具備。
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