必知的常用电气知识点成套知识汇总.doc
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1、必知的常用电气知识点成套知识汇总一、各种标准代号代码标准GB国家标准GB/T国家推荐标准GBJ国家标准(工程建设)JGJ建筑行业标准DL/T电气行业标准(推荐)JB/T机械行业标准(推荐)IEC国际电工委员会ISO国际标准化组织EN欧洲标准化委员会ANSI美国国家标准NEC美国全国电气规程BS美国国家标准AS澳大利亚国家标准UNI意大利国家标准DIN德国国家标准JEC日本电气学标准CAN加拿大国家标准二、国标推荐及图例注:1、当断路器切除短路能力不够时,可加熔断器,此时,断路器只作过载保护及操作用。2、国家标准中已没有负荷开关这一称呼及相应的图例,平常所谓的负荷开关,实际上是隔离开关的一种,当
2、隔离开关的使用类别为AC-21、AC-22、AC-22时,即为所谓的负荷开关。三、常用数据表格表1、变压器高压短路容量500KVA,低压0.4KV出口短路电流值(KA)变压器容量KVAUd%44.555.566.5740014.112.650017.615.6814.16302219.617.716.114.880027.724.722.320.418.7100030.727.725.323.321.5125037.934.331.328.826.7160047.943.339.736.533.831.5200065.660.155.551.548.1表2、变压器基本参数及低压基本配置估算值变
3、压器容量KVA低压侧电流A高压侧电流A低压出口开关壳架电流A补偿电容量KVar6KV10KV40057738.42363014050072048.128.880016063090760.636.4100020080011527746.112503001000144396.257.71600401012501800120.272.120004401600230415492.3250056020002880192.4115.4320060025003600240144.34000800注:变压器电压10(6)0.4KV。表3、PE线选择相线截面SPE截面(mm2)相线截面S(mm2)PE截面(mm
4、2)S16S400S80020016S3516S800S/425S400S/2表4、塑料线BV、BVR载流量(温升为65K,环境升为4)截面(mm2)载流量(A)截面(mm2)载流量(A)425133501341170633143701701209104315995209125116591831202511296258311091502961340351091134表5、单片母线的载流量(A)e=70K,环境温度为40母线尺寸宽*厚(mm2)铜交流直流253035402530354015*321019718517021019718517020*3275258242223275258242223
5、25*334032029927634032029927630*447544641838547544641838540*462558755050662558755050640*570065961556770566462057150*586080975669787081876570550*695589884077496090284577880*61480190130012001510142013301225100*6181017001590147087517601650152060*81320124011601070134512651185109080*8169015901490137017551
6、65015451420100*820801955183016852180205019201770120*82400225521101195152514321340123560*101475138813001195152514321340123580*1019001786167015401990187017501610100*1023102170203018702470232021752000120*1026502490233021502950271025952390注:1、本表中系母线立放的数据,当母线平放且宽度60mm时,表中数据应乘以0.95,60mm时应接续以0.92。2、本表数据与高压
7、配电装置规程数据相同。3、当为多片铜排时,中要排间留有一定空隙,其载流量等于各单片铜排载流量之和。表6 、抽屉内用乙炳绝缘非燃性护套软电缆JEFR载流量截面(mm2)载流量(A)截面(mm2)载流量(A)1075702601610592310251301203503517015040050215表7、铜母排允许短路冲击电流峰值(kA)(验证动稳定用)支持点间距(mm)1001200相间距(mm)20050030020025030030*430.834.537.825.728.731.540*441.14650.534.238.34240*54651.556.438.342.846.950*55
8、7.564.370.647.93.658.750*663.170.477.252.558.764.360*675.684.692.863.370.677.280*6101112.8123.684.194103.160*887.497.710772.881.489.280*8116.5130.2142.797.1108.6118.9100*8145.6162.8178.4121.3135.6148.8表8 、铝母排允许短路冲击电流峰值(kA)(验证动定稳定用)支持点间距(mm)1001200相间距(mm)20050030020025030030*421.824.426.718.220.322.3
9、40*429.132.535.724.227.129.740*532.536.439.927.130.333.250*540.745.549.933.937.941.550*644.649.854.637.141.545.560*653.559.865.644.849.954.680*671.479.887.459.566.572.9100*689.299.8109.374.483.191.0表9、 低压柜电气间隙爬电距离相对地电压Ui(V)电气间隙(mm)爬电距离(mm)63及以下大于63A63A及以下大于63A60Ui3005668300Ui5008101012注:220、380V抽出式开
10、关柜的电气间隙为20,爬电距离25,开关及断路器本身除外表10 、高压柜电气间隙及爬电距离额定电压(kV)电气间隙(mm)有机绝缘时,爬电距离(mm)61001401012521635300根据情况定注:电气间隙与爬电距离与介电性能及环境条件有关表11、电气设备外壳防护等级IP第一位数字表示(防固体侵入)0无防护1防直径大于50mm物体侵入(人手不能触及)2防直径大于12mm物体侵入(手指不能触及)3防直径大于2.5mm物体侵入(工具不能触及)4防直径大于1mm物体侵入(金属丝不能触及)5防尘6尘密第二位数字表示(防水侵入0无防护1防滴水2防与垂直方向150滴水3防与垂直方向600淋水4防任何
11、方向溅水5防喷水6防海浪或猛烈喷水7防浸水8防潜水表12、 低压电器的使用类别使用类别代号典型用途适用元件AC-1阴性负开接触器或电机起动器AC-2绕线式电动机AC-3笼式异步机起停AC-4笼式异步机起动、反转、反接制动、点动AC-6a变压器的通断AC-6b电容器组和通断AC-20无载条件下通断隔离器、隔离开关或刀熔开关AC-21阻性负载下通断AC-22半阻半感负载通断AC-23通断电机或高感负载A无选择性断路器B有选择性gG全范围分断(g)一般用途(G)熔断体熔断器gM全范围分断(g)电动机回路(M)熔断体aM局总范围分断(a)电动机回路(M)熔断体表13、 达到补偿后的功率因烽时所需系数K
12、值补偿前补偿后0.800.850.900.910.920.930.940.950.960.970.6603880.5190.6540.6830.7120.7430.7750.810.8470.8880.670.3580.4880.6240.6520.6820.7130.7450.7790.8160.8570.680.3280.4590.5940.6230.6520.6830.7150.7500.7870.8280.690.2990.4290.5650.5930.6230.6540.6860.7200.7570.7980.700.700.4000.5360.5650.5940.3250.6570
13、.6920.7290.7700.710.2420.3720.5080.5360.5660.5970.6010.6350.6720.7130.730.1860.3160.4520.4810.5100.5410.5730.6080.6450.6860.740.1590.2890.4250.4530.4830.5140.540.5800.6170.6580.750.0790.2620.3980.4260.4560.4870.5190.5530.5900.6310.760.0520.2350.3710.4000.4290.4600.920.5260.5630.6050.770.0260.2090.34
14、40.3730.4030.4330.4660.5000.5370.5780.780.0520.1830.3180.3470.3760.40704390.4740.5110.5520.790.0260.1560.2920.3200.3500.3810.4130.4470.4840.5250.800.1300.2660.2940.3240.3550.3870.4210.4580.4990.810.1040.2400.2680.2980.3290.3610.3950.4320.4730.820.0780.2140.2420.2720.3030.3350.3690.4060.4470.830.0520
15、.1880.2160.2460.2770.3090.4340.3800.4210.840.0260.1620.1900.2200.2510.2830.3170.3540.3950.850.1350.1640.1940.2250.2570.2910.3280.3690.860.1090.1380.1670.1980.2300.2650.3020.3430.870.0820.1110.1410.1720.2040.2380.2750.3160.880.0550.0840.1140.1450.1770.2110.2480.2890.890.080.0570.0860.1170.1490.1840.2
16、210.262注:所需补偿电容器千乏数Q,Q=Kp,p为有功功率千瓦数。表14 、电缆分支线三相短路稳态电流速查表电缆长度(m)铜电缆面积(mm2)1.2641.5642.51.5210642.51.531610642.54251610642.515957050352516102012095705035251610301209870505251645851501209570503525601501209570503580185150120957050351201209570351501209570上线故障电流(kA)铜电缆短路电流(kA)109.99.79.69.398.67.876.44.8
17、54.471514.61413.71312119.697.35.24.752019181715.614.412.8109.07.75.354.85252221.4201761613.811.19.37.95.44.93027242219.21714.611.59.58.05.454.9550393227.72219.215.8129.88.25.55604334292319.61612.29.98.255.55注:举例:若低压母线短路电流为30Ka,分支回路为长60米,120mm2铜芯电缆,末端三相短路电流为17KA(两表对照)表15 、母线螺栓搭接尺寸搭线形式类别序号连接尺寸(mm)钻孔要求
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