铜线直流电阻换算公式 电线的导体电阻计算公式怎么计算
\u94dc\u7ebf\u76f4\u6d41\u7535\u963b\u6362\u7b97\u516c\u5f0fr20=rt/1+a(t-20)
\u5f0f\u4e2d\uff1ar20\u662f\u6362\u7b97\u523020\u2103\u7684\u7535\u963b\u503c\uff0crt\u662f\u5728\u6e29\u5ea6\u4e3at\u2103\u65f6\u6d4b\u5f97\u7684\u7535\u963b\u503c\uff0ca\u662f\u94dc\u7684\u7535\u963b\u6e29\u5ea6\u7cfb\u6570\uff0ca=0.00393/\u2103\uff0ct\u662f\u6d4b\u91cf\u65f6\u7684\u73af\u5883\u6e29\u5ea6\u3002
\u66f4\u6b63\u4e00\u4e0b\u697c\u4e0a\uff1a\u8f6f\u94dc\u7ebf\u7684\u7535\u963b\u7387\u662f0.017241\u03c9\u00b7mm2/m\uff0c\u786c\u94dc\u7ebf\u7684\u7535\u963b\u7387\u662f0.01796\u03c9\u00b7mm2/m\uff0c0.0185\u6050\u6015\u662f\u4e0d\u51c6\u786e\u7684\u3002
\u7535\u7ebf\u7684\u5bfc\u4f53\u7535\u963b\u8ba1\u7b97\u516c\u5f0f\u4e3a\uff1aR\uff1d\u03c1\u00d7L/S
\u5176\u4e2d\uff0c\u03c1\u4e3a\u5bfc\u4f53\u7535\u963b\u7387\uff0cL\u4e3a\u5bfc\u4f53\u957f\u5ea6\uff0cS\u4e3a\u5bfc\u4f53\u6a2a\u622a\u9762\u79ef\u3002
\u8ba1\u7b97\u5bfc\u4f53\u7684\u7535\u963b\uff0c\u8981\u77e5\u9053\u5176\u7535\u963b\u7387\u3001\u622a\u9762\u79ef\u3001\u957f\u5ea6\uff0c\u8ba1\u7b97\u516c\u5f0f\uff1a\u7535\u963b=\u957f\u5ea6\u00d7\u7535\u963b\u7387\u00f7\u622a\u9762\u79ef\u3002
\u76f4\u6d41\u7535\u8def\uff0c\u7eaf\u7535\u963b\u6027\u8d1f\u8f7d\u4ea4\u6d41\u7535\u8def\u7684\u7535\u963b\u8ba1\u7b97\u516c\u5f0f\uff1b R=U/I\u3002\u5f0f\u4e2dR\u4e3a\u963b\u503c\u5355\u4f4d\u6b27\u59c6\u3001U\u4e3a\u7535\u538b\u5355\u4f4d\u4f0f\u7279\u3001I\u4e3a\u7535\u6d41\u5355\u4f4d\u5b89\u57f9\u3002
\u62d3\u5c55\u8d44\u6599\u7535\u963b\u5668\u5728\u65e5\u5e38\u751f\u6d3b\u4e2d\u4e00\u822c\u76f4\u63a5\u79f0\u4e3a\u7535\u963b\u3002\u662f\u4e00\u4e2a\u9650\u6d41\u5143\u4ef6\uff0c\u5c06\u7535\u963b\u63a5\u5728\u7535\u8def\u4e2d\u540e\uff0c\u7535\u963b\u5668\u7684\u963b\u503c\u662f\u56fa\u5b9a\u7684\u4e00\u822c\u662f\u4e24\u4e2a\u5f15\u811a\uff0c\u5b83\u53ef\u9650\u5236\u901a\u8fc7\u5b83\u6240\u8fde\u652f\u8def\u7684\u7535\u6d41\u5927\u5c0f\u3002\u963b\u503c\u4e0d\u80fd\u6539\u53d8\u7684\u79f0\u4e3a\u56fa\u5b9a\u7535\u963b\u5668\u3002\u963b\u503c\u53ef\u53d8\u7684\u79f0\u4e3a\u7535\u4f4d\u5668\u6216\u53ef\u53d8\u7535\u963b\u5668\u3002
\u7406\u60f3\u7684\u7535\u963b\u5668\u662f\u7ebf\u6027\u7684\uff0c\u5373\u901a\u8fc7\u7535\u963b\u5668\u7684\u77ac\u65f6\u7535\u6d41\u4e0e\u5916\u52a0\u77ac\u65f6\u7535\u538b\u6210\u6b63\u6bd4\u3002\u7528\u4e8e\u5206\u538b\u7684\u53ef\u53d8\u7535\u963b\u5668\u3002\u5728\u88f8\u9732\u7684\u7535\u963b\u4f53\u4e0a\uff0c\u7d27\u538b\u7740\u4e00\u81f3\u4e24\u4e2a\u53ef\u79fb\u91d1\u5c5e\u89e6\u70b9\u3002\u89e6\u70b9\u4f4d\u7f6e\u786e\u5b9a\u7535\u963b\u4f53\u4efb\u4e00\u7aef\u4e0e\u89e6\u70b9\u95f4\u7684\u963b\u503c\u3002
\u53c2\u8003\u8d44\u6599\uff1a\u767e\u5ea6\u767e\u79d1-\u7535\u963b\u5668
将70 和26 代入即可求出
绛旓細R20=Rt/1+a(t-20)寮忎腑锛歊20鏄鎹㈢畻鍒20鈩冪殑鐢甸樆鍊硷紝Rt鏄湪娓╁害涓簍鈩冩椂娴嬪緱鐨勭數闃诲硷紝a鏄摐鐨勭數闃绘俯搴︾郴鏁帮紝a=0.00393/鈩冿紝t鏄祴閲忔椂鐨勭幆澧冩俯搴︺傛洿姝ｄ竴涓嬫ゼ涓婏細杞閾滅嚎鐨勭數闃荤巼鏄0.017241惟路mm2/m锛岀‖閾滅嚎鐨勭數闃荤巼鏄0.01796惟路mm2/m锛0.0185鎭愭曟槸涓嶅噯纭殑銆
绛旓細鍙樺帇鍣ㄧ嚎鍦堢殑鐩存祦鐢甸樆R=蟻l/s 蟻:閾滅殑鐢甸樆鐜囅=0.017241 l锛氬绾块暱搴︼紙m)s:瀵间綋鎴潰绉,s=¼褎²锌 涔熷彲鎸:R=蟻l(鏈紡涓殑蟻涓哄渾閾滅嚎鐢甸樆锛岃闄勮〃锛
绛旓細鍧囧寑閲戝睘瀵肩嚎鐨鐩存祦鐢甸樆R=蟻L/S锛屽叾涓細R--瀵肩嚎鐨勭洿娴佺數闃伙紝惟锛浵--閲戝睘鐨勭數闃荤巼锛屛.m锛汱--瀵肩嚎鐨勯暱搴︼紝m锛汼--瀵肩嚎鐨勬埅闈㈢Н锛宮^2锛涘浜閾滅嚎锛屽畠鐨勭數闃荤巼=0.0172渭惟.m锛屾墍浠70mm^2鐨閾滃绾姣忕背鐨勭數闃诲氨鏄細0.0172脳10^-6/70脳10^-6=0.00025惟銆傝嚦浜庡簲璇ョ畻鍗曟牴鐨勭數闃昏繕鏄畻4鏍圭殑...
绛旓細閾滅嚎姣忓钩鏂规绫筹紝姣忎竴绫抽暱搴︾殑鐢甸樆鏄0.0172娆у锛岄摑绾挎槸0.0283娆у璁颁綇杩欎釜鏉愭枡鐨勭數闃荤巼涓轰粖鍚璁＄畻鏂逛究銆傚亣濡傞摐绾跨數缂100骞虫柟姣背锛屼竴鍗冪背闀垮害閭ｄ箞杩欐潯鐢电紗鐨勫崟鏍瑰绾跨數闃诲氨鏄細0.0172/100*1000=0.172{娆у}
绛旓細鐢甸樆鐜 0.016 0.0172 0.029 0.049 0.0978 0.114 --- 鏍规嵁鍏紡鍙緱鍒4骞虫柟鐨閾滅嚎涓鍗冪背鐢甸樆鏄 R=0.0172*1000/4=4.3 (惟)鍙傝冭祫鏂欙細鍏紡鏁版嵁鏉ヨ嚜涓撲笟涔︾睄锛岀函鎵嬪伐杈撳叆锛
绛旓細鍦20鈩冩椂锛屾瘡鍗冪背鐨鐩存祦鐢甸樆鏍囩О鍊间笉澶т簬7.41娆у锛岄氬父鍦6.9鍒7.4娆у涔嬮棿銆
绛旓細0.017娆у骞虫柟姣背锛忕背銆傛煇绉嶆潗鏂欏埗鎴愮殑闀夸负1绫筹紝妯埅闈㈢Н涓1骞虫柟绫崇殑瀵间綋鐨鐢甸樆锛屽湪鏁板间笂绛変簬杩欑鏉愭枡鐨勭數闃荤巼銆傚弽鏄犵墿璐ㄥ鐢垫祦闃荤浣滅敤鐨勫睘鎬э紝涓庣墿璐ㄧ殑绉嶇被鏈夊叧锛岃繕鍙楁俯搴﹀奖鍝嶃傛潗鏂欑殑鐢甸樆澶у皬涓庢潗鏂欑殑闀垮害鎴愭姣旓紝鍗冲湪鏉愭枡鍜屾í鎴潰绉笉鍙樻椂锛岄暱搴﹁秺闀匡紝鏉愭枡鐢甸樆瓒婂ぇ锛涜屼笌鏉愭枡妯埅闈㈢Н鎴愬弽姣旓紝...
绛旓細鎴潰鏄16mm²鐨閾滅嚎鐨鐩存祦鐢甸樆鏄1.15娆/km锛0.7绫抽暱鐨勭數闃伙細1.15娆/kmx0.0007km=0.000805娆р増0.8寰
绛旓細璁＄畻閾滅嚎鎵闇鐨勬埅闈㈢Н锛岄渶瑕佽冭檻鐢垫祦銆佺嚎璺暱搴﹀拰鐢靛帇闄嶇殑褰卞搷銆傝繖閲屾牴鎹暟鎹帹绠楋紝鍋囪璇ョ數璺礋杞戒负2000W锛岀數鍘嬩负13.2V鏃讹紝鐢垫祦涓 I = P/V = 2000W/13.2V = 151.51A锛涘悓鏃讹紝鍋囪绾胯矾闀垮害涓1绫筹紝鍒欐牴鎹鐢甸樆鍏紡 R = 蟻L/A锛屽叾涓佷负鐢甸樆鐜囷紝L涓虹嚎璺暱搴︼紝A涓虹嚎璺埅闈㈢Н锛屾垜浠彲浠ュ緱鍒扮數璺...
绛旓細s涓洪潰绉:s=1/4蟺d²锛孲涓妯埅闈㈢Н 锛堝钩鏂规绫筹級R涓閾滅嚎鐢甸樆 锛堟姣嶏級 L鈥旈摐绾块暱搴︼紙绫筹級鍥犻摐鏉嗙殑鐢甸樆寰堝皬锛岃嫢瑕佺洿鎺ヤ娇鐢ㄥ弻鑷鐩存祦鐢垫ˉ娴嬮噺鐢甸樆锛岃娉ㄦ剰鍚勫紩绾跨殑鐢甸樆鍙婃帴瑙︾數闃诲娴嬮噺缁撴灉鐨勫奖鍝嶏紒鈶犺娴嬬數闃荤殑鐢垫祦绔挳鍜岀數浣嶇閽簲鍜屽弻鑷傜數妗ョ殑瀵瑰簲绔挳姝ｇ‘杩炴帴銆傚綋琚祴鐢甸樆娌℃湁涓撻棬鐨勭數浣...
