请问一台380V，75KW电加热器的电缆应该选多大的？ 已知380V加热器50KW加热时单根电缆的电流是多互感器应选...
50KW380V\u7684\u7535\u52a0\u70ed\u5668\u914d\u591a\u5927\u7535\u7f06\u914d3*35\u5e73\u65b9\u7535\u7f06
\u3000\u3000\u662f\u95ee50KW\u7684\u7535\u52a0\u70ed\u5668\uff0c\u91c7\u7528\u4e09\u76f8\u4e94\u7ebf\u7684380V\u4f9b\u7535\uff0c\u6bcf\u76f8(\u5355\u6839\u7535\u7f06)\u7535\u6d41\u662f\u591a\u5c11\u5b89\uff1f\u9009\u7528\u591a\u5927\u7535\u7f06\u548c\u591a\u5927\u4e92\u611f\u5668\uff0c\u82e5\u662f\u8fd9\u6837\u89c1\u4e0b\u9762\u7684\u9009\u62e9\uff1a
\u8ba1\u7b97\u4e09\u76f8\u7535\u6d41\uff1aIjs=P/U/\u221a3/cos\u03c6=50000/380/1.732/0.95\u224880A
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\u5728\u4e0d\u8003\u8651\u4f9b\u7535\u8ddd\u79bb\u7684\u60c5\u51b5\u4e0b\uff0c\u9009\u62e950mm²\u7684\u94dc\u82af\u805a\u6c2f\u4e59\u70ef\u7edd\u7f18\u7535\u7f06\u6216\u800570mm²\u7684\u94dd\u82af\u805a\u6c2f\u4e59\u70ef\u7edd\u7f18\u7535\u7f06\u5408\u9002\uff0c\u5373\uff1aVV-3\u00d750+2\u00d725\u6216\u8005BLV-3\u00d770+2\u00d735\uff0c\u5b83\u4eec\u7684\u5b89\u5168\u8f7d\u6d41\u91cf\u5206\u522b\u662f115A\u548c115A\u3002
\u4e00\u822c\u6d4b\u91cf\u4eea\u8868\u7684\u91cf\u7a0b\u57281/2\uff5e2/3\u4e3a\u597d\uff0c\u5219:80/(2/3)\u2248120A\uff0c\u9009\u7528150/5\u7684\u7535\u6d41\u4e92\u611f\u5668\u3002
一台380V75KW电加热器，线路电流在197A多，查国家电工规范“500伏铜芯绝缘导线长期连续负荷允许载流量表”，197A电流，应该选择50平方毫米的铜芯电缆。
绛旓細涓鍙380V75KW鐢鍔犵儹鍣紝绾胯矾鐢垫祦鍦197A澶氾紝鏌ュ浗瀹剁數宸ヨ鑼冣500浼忛摐鑺粷缂樺绾块暱鏈熻繛缁礋鑽峰厑璁歌浇娴侀噺琛ㄢ濓紝197A鐢垫祦锛屽簲璇ラ夋嫨50骞虫柟姣背鐨勯摐鑺數缂嗐
绛旓細380V鐨涓夌浉寮傛鐢靛姩鏈虹殑棰濆畾鐢垫祦宸ョ▼浼扮畻鍙互鎸夌収鐢垫満鍔熺巼x2鍗充负鐢垫満棰濆畾鐢垫祦銆傜簿纭绠楀叕寮忔槸锛欼锛漃/锛1.732xUxcos蠁x畏锛夛紝鍗抽瀹氱數娴佷负鐢垫満鍔熺巼闄や互鏍瑰彿3锛屽啀闄や互鐢垫満鐢靛帇锛屽啀闄や互鍔熺巼鍥犳暟锛屽啀闄や互鏁堢巼銆備及绠楁柟寮忓緱鍒扮數娴佷负锛75x2=150A銆傜簿纭绠楁柟寮忓緱鍒扮數娴佷负锛欼锛漃/锛1.732xUxcos蠁x畏锛=11...
绛旓細鐢靛帇鏄380,鍔熺巼鏄75,COSQ鍙0.9 杩欐牱鐨勮瘽鐢垫祦灏辨槸126.6A
绛旓細鐩存帴鍦ㄦ槦涓夎鎺у埗绾胯矾鎴栭檷鍘嬪惎鍔ㄧ嚎璺富鎺ヨЕ鍣ㄧ殑绾垮湀鍜岃繘绾夸晶涓婂苟鎺ヤ竴涓50a鐢靛鎺ヨЕ鍣紝锛堢嚎鍦堝拰绾垮湀骞舵帴杩涚嚎渚у拰杩涚嚎渚у苟鎺ワ級鐒跺悗鍦ㄧ數瀹规帴瑙﹀櫒鐨勫嚭绾夸晶鎺ヤ竴涓30kva涓夌浉鐢靛鍣ㄣ傚氨杩欎箞绠鍗曘
绛旓細鍑嗙‘鐨勭畻涓嶄簡锛75kW鎸囬瀹氳緭鍑哄姛鐜囷紝杩橀渶瑕佺煡閬撴晥鐜囧兼墠鑳界畻銆148A铏界劧鏄緭鍏ョ數娴侊紝鐢靛帇380V锛屼絾鏄繕瑕佷箻浠ュ姛鐜囧洜鏁般傚鏋滃姛鐜囧洜鏁扮畻0.85鐨勮瘽锛屽彲浠ヤ及璁¤楃數閲忔槸83kWh宸﹀彸
绛旓細绛旓細380V鐢靛帇鐨勪笁鐩哥數婧锛75kW鐢25骞虫柟閾滆姱鐢电紗锛堟垨鑰35骞虫柟閾濊姱鐢电紗锛夈傝В鏋愶細380V鐢垫簮鏄笁鐩哥數锛屾牴鎹笁鐩哥數鍔熺巼鍏紡锛歅=鈭3*U*I*cos蠄锛屽叾涓璓涓哄姛鐜囷紝鈭3鈮1.732涓轰笁鐩哥數鍊嶇巼锛孶涓虹數鍘嬶紝I涓虹數娴侊紝cos蠁涓哄姛鐜囧洜鏁帮紙涓鑸彇0.8锛夛紝鍙緱 I=P/鈭3*U*cos蠄=75000/(1.732脳380脳0.8)鈮142...
绛旓細120MM2閾濊姱鐢电紗鐨勮浇娴侀噺250A,75KW鐢垫満澶х害鏄150A.鎵浠ョ嚎寰勮冻澶熺敤浜
绛旓細鐢70骞虫柟閾滅嚎瓒崇煟銆
绛旓細75kw380v鍦50骞虫柟鐢ㄩ摐鑺數缂嗙嚎锛70骞虫柟鐢ㄩ摑鑺數缂嗐75鍗冪摝鐨勫姛鐜囩殑浣跨敤鐜锛岃繛鎺ョ殑鐢靛帇閫氬父鏄湪380V锛寰楀嚭75鍗冪摝鐢佃矾涓殑鐢垫祦鏄141.5瀹夛紝宸茬煡闇瑕佹壙杞借嚦灏141.5瀹夌數娴佹椂锛屽搴旂殑閾滆姱鐢电紗绾夸负50骞虫柟姣背锛岃屽搴旂殑閾濊姱鐢电紗绾夸负70骞虫柟姣背銆傜數缂嗙嚎閫夋嫨娉ㄦ剰浜嬮」锛1銆佸湪閫夎喘鐢电紗绾挎椂锛岃鐪嬩竴涓嬬數缂嗙嚎琛ㄩ潰...
绛旓細P=鈭3UI,鍏朵腑U=380V,P=75kW,鍒橧=114A 姝ょ數娴佷负绾跨數娴,姣忕浉鐢甸樆鐨勭數娴佷负锛欼/鈭3=65.79A 姣忕浉鐢甸樆涓猴細380/65.79=5.776惟 鎴栬咃細姣忕浉鍔熺巼涓75/3=25kW,涓夎褰㈡帴娉,鐩哥數鍘嬩负380V,鍒欙細姣忕浉鐢垫祦涓猴細I=P/U=25000/380=65.79A 姣忕浉鐢甸樆涓猴細R=U^2/P=380*380/25000=5.776惟 ...
