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=0.125 I ~0.2 I(mm2) S-----閾滃綰挎埅闈㈢Н(mm2) I-----璐熻澆鐢墊祦(A) 銆銆涓夈佸姛鐜囪綆椾竴鑸礋杞?涔熷彲浠ユ垚涓虹敤鐢?shù)鍣ㄥQ屽鐐圭伅銆佸啺綆辯瓑絳?鍒嗕負涓ょ錛屼竴縐嶅紡鐢?shù)闃绘ц礋杞斤紝涓縐嶆槸鐢墊劅鎬ц礋杞姐傚浜庣數(shù)闃繪ц礋杞界殑璁＄畻鍏紡錛歅=UI 瀵逛簬鏃ュ厜鐏礋杞界殑璁＄畻鍏紡錛歅=UIcos褎錛屽叾涓棩鍏夌伅璐熻澆鐨勫姛鐜囧洜鏁癱os褎=0.5銆?涓嶅悓鐢墊劅鎬ц礋杞藉姛鐜囧洜鏁頒笉鍚岋紝緇熶竴璁＄畻瀹跺涵鐢ㄧ數(shù)鍣ㄦ椂鍙互灝嗗姛鐜囧洜鏁癱os褎鍙?.8銆備篃灝辨槸璇村鏋滀竴涓搴墍鏈夌敤鐢?shù)鍣ㄥ姞涓婃誨姛鐜囦負6000鐡︼紝鍒欐渶澶х數(shù)嫻佹槸 I=P/Ucos褎=6000/220*0.8=34(A) 浣嗘槸錛屼竴鑸儏鍐典笅錛屽閲岀殑鐢?shù)鍣ㄤ笉鍙兘鍚宂]>
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