电力变压器设计手册1铁心计算

1、设 计 手 册油 浸 电 力 变 压 器铁 心 计 算 油 浸 电 力 变 压 器 铁 心 计 算0101 共 页第 页 目 录 1铁心材料sb1-007.1第1页2铁心直径的估算sb1-007.1第1页2.1每柱容量(pzh)的计算sb1-007.1第1页2.2铁心直径(do)的估算sb1-007.1第1页3铁心中磁通(m )及磁通密度(bm )计算sb1-007.1第2页3.1铁心中磁通(m )sb1-007.1第2页3.2磁通密度(bm )sb1-007.1第2页4空载损耗(po )计算sb1-007.1第2页5空载电流(io% )计算sb1-007.1第2页5.1中小型变压器(6300

2、kva)的空载电流(io% )计算sb1-007.1第2页5.2大型变压器(6300kva)的空载电流(io% )计算sb1-007.1第2页6冷轧硅钢片性能数据sb1-007.1第3页7铁心重量计算sb1-007.1第7页7.1铁心柱重量(gzh)计算sb1-007.1第7页7.2铁轭重量(ge)计算sb1-007.1第7页7.3角重计算sb1-007.1第7页7.3.1三相三柱式铁心角重(g )计算(d形轭)sb1-007.1第8页7.3.2三相五柱式铁心角重(g )计算(主轭及旁轭均采用相同d形轭)sb1-007.1第8页7.4铁心重量(gtx )计算sb1-007.1第9页8铁心温升计

3、算sb1-007.1第9页8.1铁心内部最热点对表面的温差(o )计算sb1-007.1第9页8.2铁心表面对油的温差(b )计算sb1-007.1第9页8.2.1铁心级块的单位高度(1cm)的热负荷(qjk)计算sb1-007.1第9页8.2.2铁心表面对油的温差(b )计算sb1-007.1第9页8.3铁心温升计算sb1-007.1第10页8.3.1铁心表面温升(bp )计算sb1-007.1第10页8.3.2铁心内部最热点温升(m )计算sb1-007.1第10页 9铁心数据9.1三相三柱式(无拉板结构)铁心数据sb1-007.1第11页9.2三相三柱式拉板结构铁心数据sb1-007.1

4、第13页9.3三相五柱式拉板结构铁心数据sb1-007.1第16页 共 19 页 第 1 页 代替 油 浸 电 力 变 压 器 铁 心 计 算设 计 手 册 1 铁心材料 铁心采用冷轧硅钢片叠积而成, 由于硅钢片表面已有附着性较好的绝缘薄膜, 故可 不再涂漆。 铁心常用硅钢片牌号及叠片系数 ( fd ) 从表 1.1中选取 。 表 1.1 铁心常用硅钢片牌号及叠片系数( fd ) 硅 钢 片 牌 号 叠片系数 适 用 范 围 日本新日铁 ( 川崎 ) 中国国标( fd ) 35z155 (35rg155) 35z145 (35rg145) 35q155 35q145 0.97 0.97 常 规

5、 产 品 30z140 (30rg140) 30q140 0.96 30zh120 (30rgh120) 30qg120 0.96 1) 500kv级的产品 2) 要求损耗较低的产品 3) 要求噪声较低的产品 27zh100 (27rgh100) 0.955要求损耗极低的产品(需经批准) 23zh 90 (23rgh090) 23zdkh90 (23rghpj090) 0.945要求非常特殊的产品(需经批准) 2 铁心直径的估算 2.1 每柱容量 ( pzh ) 的计算 每柱容量是在每个铁心柱上的各绕组额定容量折算成双绕组后的型式容量。 kva ( 1.1 ) 式 中: pri 各绕组额定容量

6、的总和( kva ) , 如高、中压为自耦联结时, 则高压 及中压额定容量, 应分别乘以效益系数 ; 其中: u1、u2 分别为高压及中压的额定电压( kv ) ; mzh 套有绕组的铁心柱数。 2.2 铁心直径 ( d0 ) 的估算 (从表1.5表1.7中选取标准直径) mm ( 1.2 ) 式中: kd 铁心直径经验系数 , 对冷轧硅钢片的铁心及铜绕组的变压器 , 一般取 kd = 5257 , 对特大型变压器 , 由于运输高度的限制 , 此经验系数 有时取得还要大些; 资 料 来 源 编 制 校 核 标 审 提出部门 审 定 标记 处数 更改文件号 签 字 日 期 实施日期 批 准 pz

7、h 每柱容量( kva ) , 按公式( 1.1 ) 计算。 共 页 219 第 页 油 浸 电 力 变 压 器 铁 心 计 算 3 铁心中磁通(m )及磁通密度( bm )计算 3.1 铁心中磁通: wb ( 1.3 ) 当f = 50hz 时: wb ( 1.3a ) 3.2 磁通密度: t ( 1.4 ) 式中: e t 每匝电势( v ) , 见线圈计算; f 额定频率( hz ) ; s zh 铁心柱净截面( cm2 ) , 根据表1.1 的叠片系数( f d ) , 从铁心数据表中选取, 三相三柱式无拉板结构 ( do = 70395 ) 从表 1.5 中选取 ; 三相三柱式拉板结

8、构 ( do = 3401000 ) 从表 1.6 中选取 ; 三相五柱式拉板结构 ( do = 7801600 ) 从表 1.7 中选取 。 4 空载损耗(p0)计算 w ( 1.5 ) 式中: kp0 空载损耗工艺附加系数, 铁心为全斜接缝时, 从表1.2 中选取; ptx 铁心硅钢片单位损耗(w/kg ),根据铁心柱磁通密度(bm ),从表1.3或表1.4中选取; gtx 铁心硅钢片总重量( kg ), 按公式( 1.12 )计算。 5 空载电流( i 0 % )计算 (一般忽略由空载损耗产生的空载电流的有功部分 ) 5.1 中小型变压器(6300kva)的空载电流( i 0% )计算

9、% ( 1.6 ) 5.2 大型变压器(6300kva)的空载电流( i 0% )计算 % ( 1.7 ) 式中: gzh、ge、g、gex 铁心柱重、铁轭重、铁心角重及铁心总重量( kg ), 分别 按公式(1.8)至公式(1.12)计算, 角重可从 表1.5 至 表1.7 中直接选取; k 铁心转角部分励磁电流增加系数, 对全斜接缝, 一般取 k = 4; szh 铁心柱净截面( cm2 ), 从 表1.5 至 表1.7 中选取; n j 铁心接缝总数, 三相三柱式一般取 n j = 8; q tx 铁心单位磁化容量( va / kg ) , 根据心柱磁密( bm ), 从表1.3 或表1

10、.4 中选取; q j 接缝磁化容量(va/cm2),根据斜接缝处磁密( ),从表1.3或表1.4中选取; pr 额定容量( kva ); ki 0 空载电流附加系数, 铁心为全斜接缝时, 从表1.2 中选取。 表1.2 附加系数 ( 铁心为全斜接缝时 )铁心形式 三 相 三 柱 式三相五柱式单相二柱容量(kva)10010050063016002000630080006300063000等 轭不等轭三四柱式系数kpo1.31.251.21.181.151.151.21.351.05系数 kio1.61.41.41.61.3 注: 三相五柱式等轭是指主轭和旁轭截面相等, 不等轭是指主轭和旁轭截

11、面不相等。 油 浸 电 力 变 压 器铁 心 计 算共 页第 页193 6 冷轧硅钢片性能数据 冷轧硅钢片性能数据,可按表 1.3公式计算, 或直接从表 1.4 中选取。表 1.3 冷轧硅钢片性能数据计算公式 ( 50hz )硅 钢 片 牌 号铁 心 硅 钢 片 单 位 损 耗 p tx ( w / kg )35q155或35z155ptx =0.8800 bm6 + 6.2783 bm517.0669 bm4 + 22.9573 bm315.8534 bm2 + 5.8481 bm0.822335q145或35z145ptx =0.0835 bm6 + 0.9795 bm5 2.9939 b

12、m4 + 3.8683 bm3 1.8866 bm2 + 0.5736 bm0.021730q140或30z140ptx =1.7809 bm6 + 13.1124 bm538.0493 bm4 + 56.1093 bm344.0967 bm2 + 18.0062 bm2.893930q130或30z130ptx = 1.5823 bm6 9.7965 bm5 + 24.6357 bm431.9239 bm3 + 22.6971 bm2 7.94 00bm + 1.133930qg120或30zh120ptx = 1.8690 bm611.4113 bm5 + 28.3144 bm436.36

13、81 bm3 + 25.7433 bm2 9.1095 bm + 1.336627qg110或27zh110ptx = 2.1548 bm613.6051 bm5 + 35.1257 bm447.2836 bm3 + 35.1903 bm213.3025 bm + 2.061327qg100或27zh100ptx = 1.9297 bm611.7533 bm5 + 29.1399 bm437.5704 bm3 + 26.8344 bm2 9.7052 bm + 1.4403硅 钢 片 牌 号bm1.45 t 的 铁 心 单 位 磁 化 容 量q tx ( va / kg ) 35q155或35

14、z155qtx = 4.8274 bm625.7023 bm5 + 56.2799 bm464.7507 bm3 + 41.7033 bm213.7745 bm + 1.922335q145或35z145qtx = 2.9842 bm615.3992 bm5 + 32.7524 bm436.6953 bm3 + 23.3006 bm2 7.4853 bm + 1.043130q140或30z140qtx =0.1083 bm6+ 2.3843 bm5 8.8286 bm4 + 14.0577 bm310.9084 bm2 + 4.5790 bm0.696430q130或30z130qtx =

15、1.4783 bm6 6.8160 bm5 + 12.6880 bm411.8062 bm3 + 5.8606 bm2 0.9722 bm + 0.037630qg120或30zh120qtx = 0.3832 bm6 1.0672 bm5 + 0.2876 bm4 + 1.8847 bm3 2.1212 bm2 + 1.2956 bm0.203127qg110或27zh110qtx = 1.8337 bm6 9.9149 bm5 + 22.3342 bm426.6411 bm3 + 17.9347 bm2 5.9472 bm + 0.841827qg100或27zh100qtx = 1.75

16、78 bm6 9.6301 bm5 + 21.9050 bm426.1707 bm3 + 17.4491 bm2 5.6493 bm + 0.7689硅 钢 片 牌 号bm1.45 t 的 铁 心 单 位 磁 化 容 量q tx ( va / kg )35q155或35z155q tx = 20992.2351 bm6 193966.3635 bm5 + 746158.9080bm41529503.3842 bm3 + + 1761902.3391 bm21081386.5451 bm + 276262.6779135q145或35z145q tx = 35663.1360 bm6 33858

17、2.1027 bm5 + 1338331.8493 bm42818965.8453 bm3 + + 3336821.1050 bm22104463.0665 bm + 552435.591130q140或30z140q tx = 26283.7512 bm6 248107.5545 bm5 + 975288.5046 bm42043303.558 bm3 + + 2406169.7472 bm21509933.1333 bm + 394448.88730q130或30z130q tx = 20904.6342 bm6 196573.8985 bm5 + 769896.5323 bm416074

18、01.7252 bm3 + + 1886624.5028 bm21180202.7017 bm + 307395.989730qg120或30zh120q tx = 18760.0210 bm6 178634.7179 bm5 + 707998.9897 bm41494934.6951 bm3 + + 1773538.3478 bm21120852.4452 bm + 294797.191527qg110或27zh110q tx = 13460.0734 bm6 126075.4130 bm5 + 491709.7429 bm41022040.3747 bm3 + + 1194021.4623

19、 bm2 743362.0138 bm + 192667.971827qg100或27zh100q tx = 13293.2496 bm6 126047.4866 bm5 + 497630.5106 bm41046950.2658 bm3 + + 1237905.0699 bm2 779907.2543 bm + 204532.8786接缝磁化容量q j (va / cm2 ), (按斜接缝处磁密bmj = bm /1.414计算 )bm1.45 tq j = 11.5526 bmj 6 + 59.4563 bmj 5 119.5772 bmj 4 + 121.9129 bmj 3 66.43

20、43 bmj 2 + 18.2845 bmj 1.9663bm1.45 tq j = 77.4084 bmj 6 945.3550 bmj 5 + 4643.7887 bmj 4 11819.5014 bmj 3 + + 16528.1076 bmj 2 12084.5185 bmj + 3619.2298 油 浸 电 力 变 压 器铁 心 计 算共 页第 页 194表 1.4 冷轧硅钢片性能数据表 ( 50hz ).硅钢片牌号27 qg 10027 z h 10027 rgh 10027 qg 11027 z h 11027 rgh 11030 qg 12030 z h 12030 rgh

21、12030 q 13030 z 13030 rg 13030 q 14030 z 14030 rg 14035 q 14535 z 14535 rg 14535 q 15535 z 15535 rg 155所 有硅钢片牌 号磁通密度(t)单位铁损w/kg磁化容量va/kg单位铁损w/kg磁化容量va/kg单位铁损w/kg磁化容量va/kg单位铁损w/kg磁化容量va/kg单位铁损w/kg磁化容量va/kg单位铁损w/kg磁化容量va/kg单位铁损w/kg磁化容量va/kg接缝磁化容量va/ cm20.500.0800.1300.0940.1350.1100.1400.1050.1450.110

22、0.1450.1160.1500.1230.1550.0050.520.0870.1400.1020.1450.1190.1500.1140.1550.1190.1550.1250.1600.1330.1650.0060.540.0940.1500.1100.1550.1280.1600.1230.1650.1280.1650.1350.1700.1430.1750.0070.560.1020.1600.1180.1650.1370.1700.1320.1750.1370.1750.1450.1800.1530.1850.0080.580.1100.1700.1260.1750.1460.18

23、00.1410.1850.1460.1850.1550.1900.1640.1950.0090.600.1180.1800.1340.1850.1550.1900.1500.1950.1550.1950.1650.2000.1750.2050.0100.620.1260.1910.1420.1960.1640.2010.1600.2070.1650.2070.1760.2120.1860.2170.0120.640.1340.2020.1510.2070.1730.2120.1700.2190.1750.2190.1870.2240.1970.2290.0140.660.1420.2130.1

24、600.2180.1820.2230.1800.2310.1850.2310.1980.2360.2080.2410.0160.680.1500.2240.1690.2290.1910.2340.1900.2430.1950.2430.2090.2480.2190.2530.0180.700.1580.2350.1780.2400.2000.2450.2000.2550.2050.2550.2200.2600.2300.2650.0200.710.1620.2410.1820.2460.2050.2510.2060.2610.2110.2610.2260.2670.2360.2720.0210

25、.720.1660.2470.1860.2520.2100.2570.2120.2670.2170.2670.2320.2740.2420.2790.0220.730.1700.2530.1900.2580.2150.2630.2180.2730.2230.2730.2380.2810.2490.2860.0230.740.1740.2590.1940.2640.2200.2690.2240.2790.2290.2790.2440.2880.2560.2930.0240.750.1780.2650.1980.2700.2250.2750.2300.2850.2350.2850.2500.295

26、0.2630.3000.0250.760.1830.2710.2030.2760.2300.2820.2360.2910.2410.2920.2560.3020.2700.3070.0270.770.1880.2770.2080.2820.2350.2890.2420.2970.2470.2990.2620.3090.2770.3140.0290.780.1930.2830.2130.2880.2400.2960.2480.3030.2530.3060.2680.3160.2840.3210.0310.790.1980.2890.2180.2940.2450.3030.2540.3100.25

27、90.3130.2740.3230.2920.3280.0330.800.2030.2950.2230.3000.2500.3100.2600.3170.2650.3200.2800.3300.3000.3350.0360.810.2080.3010.2280.3070.2560.3170.2660.3240.2710.3270.2870.3380.3080.3430.0390.820.2130.3070.2330.3140.2620.3240.2720.3310.2770.3340.2940.3460.3160.3510.0420.830.2180.3130.2380.3210.2680.3

28、310.2780.3380.2830.3410.3010.3540.3240.3590.0450.840.2230.3190.2430.3280.2740.3380.2840.3450.2900.3480.3080.3620.3320.3670.0480.850.2280.3250.2490.3350.2800.3450.2900.3520.2970.3550.3150.3700.3400.3750.0510.860.2330.3320.2550.3420.2860.3520.2960.3590.3040.3630.3230.3780.3480.3830.0540.870.2380.3390.

29、2610.3490.2920.3590.3020.3660.3110.3710.3310.3860.3560.3910.0570.880.2430.3460.2670.3560.2980.3660.3080.3730.3180.3790.3390.3940.3640.3990.0600.890.2490.3530.2730.3630.3040.3730.3140.3800.3250.3870.3470.4020.3720.4070.0630.900.2550.3600.2790.3700.3100.3800.3200.3880.3320.3950.3550.4100.3800.4150.067

30、0.910.2610.3670.2850.3770.3160.3880.3260.3950.3390.4030.3630.4190.3880.4240.0710.920.2670.3740.2910.3840.3220.3960.3320.4020.3460.4110.3710.4280.3960.4330.0750.930.2730.3810.2970.3910.3280.4040.3380.4090.3530.4190.3790.4370.4040.4420.0800.940.2790.3880.3030.3980.3340.4120.3440.4170.3600.4270.3870.44

31、60.4120.4510.0850.950.2850.3950.3090.4050.3400.4200.3500.4250.3670.4350.3950.4550.4200.4600.0900.960.2910.4020.3150.4120.3470.4280.3570.4340.3740.4440.4030.4640.4280.4690.0960.970.2970.4090.3220.4190.3540.4360.3640.4430.3810.4530.4110.4730.4360.4780.1020.980.3030.4160.3290.4260.3610.4440.3710.4520.3

32、890.4620.4190.4820.4440.4870.1090.990.3090.4230.3360.4330.3680.4520.3780.4610.3970.4710.4270.4910.4520.4960.1171.000.3150.4300.3430.4400.3750.4600.3850.4700.4050.4800.4350.5000.4600.5050.1251.010.3220.4380.3500.4480.3820.4680.3930.4790.4130.4890.4440.5100.4680.5150.1351.020.3290.4460.3570.4560.3890.

33、4760.4010.4880.4210.4980.4530.5200.4760.5250.1451.030.3360.4540.3640.4640.3960.4840.4090.4970.4290.5070.4620.5300.4840.5350.1551.040.3430.4620.3710.4720.4030.4920.4170.5060.4370.5160.4710.5400.4920.5450.1651.050.3500.4700.3780.4800.4100.5000.4250.5150.4450.5250.4800.5500.5000.5550.175 油 浸 电 力 变 压 器铁

34、 心 计 算共 页第 页195续表 1.4 冷轧硅钢片性能数据表 ( 50hz ).硅钢片牌号27 qg 10027 z h 10027 rgh 10027 qg 11027 z h 11027 rgh 11030 qg 12030 z h 12030 rgh 12030 q 13030 z 13030 rg 13030 q 14030 z 14030 rg 14035 q 14535 z 14535 rg 14535 q 15535 z 15535 rg 155所 有硅钢片牌 号磁通密度(t)单位铁损w/kg磁化容量va/kg单位铁损w/kg磁化容量va/kg单位铁损w/kg磁化容量va/k

35、g单位铁损w/kg磁化容量va/kg单位铁损w/kg磁化容量va/kg单位铁损w/kg磁化容量va/kg单位铁损w/kg磁化容量va/kg接缝磁化容量va/ cm21.050.3500.4700.3780.4800.4100.5000.4250.5150.4450.5250.4800.5500.5000.5550.1751.060.3570.4780.3850.4880.4180.5090.4340.5250.4540.5350.4890.5600.5090.5650.1871.070.3640.4860.3920.4960.4260.5180.4430.5350.4630.5450.4980

36、.5700.5180.5750.2001.080.3710.4940.3990.5040.4340.5270.4520.5450.4720.5550.5070.5800.5270.5850.2141.090.3780.5020.4060.5120.4420.5360.4610.5550.4810.5650.5160.5900.5360.5950.2291.100.3850.5100.4130.5200.4500.5450.4700.5650.4900.5750.5250.6000.5450.6050.2451.110.3920.5190.4200.5290.4580.5540.4790.575

37、0.4990.5850.5340.6110.5550.6160.2611.120.3990.5280.4270.5380.4660.5630.4880.5850.5080.5950.5430.6220.5650.6270.2781.130.4060.5370.4340.5470.4740.5720.4970.5950.5170.6050.5520.6330.5750.6380.2961.140.4130.5460.4410.5560.4820.5810.5060.6060.5260.6160.5610.6440.5850.6490.3151.150.4200.5550.4480.5650.49

38、00.5900.5150.6170.5350.6270.5700.6550.5950.6600.3351.160.4270.5640.4550.5740.4980.6000.5240.6280.5440.6380.5790.6660.6050.6710.3571.170.4340.5730.4620.5830.5060.6100.5330.6390.5530.6490.5880.6770.6150.6820.3811.180.4410.5820.4690.5920.5140.6200.5420.6500.5620.6610.5970.6880.6250.6930.4071.190.4480.5

39、910.4760.6010.5220.6300.5510.6610.5710.6730.6060.6990.6350.7040.4351.200.4550.6000.4830.6100.5300.6400.5600.6720.5800.6850.6150.7100.6450.7150.4651.210.4620.6100.4900.6200.5390.6500.5690.6840.5900.6970.6250.7220.6550.7270.4961.220.4690.6200.4980.6300.5480.6600.5780.6960.6000.7090.6350.7340.6650.7390

40、.5281.230.4760.6300.5060.6400.5570.6700.5870.7080.6100.7220.6450.7470.6750.7520.5611.240.4830.6410.5140.6510.5660.6800.5960.7200.6200.7350.6550.7600.6850.7650.5951.250.4900.6520.5220.6620.5750.6900.6050.7330.6300.7480.6650.7730.6950.7780.6301.260.4980.6630.5300.6730.5840.7010.6150.7460.6400.7620.6750.7870.7050.7920.6701.270.5060.6740.5380.6840.5930.7120.6250.7600.6500.7760.6850.8010.7150.8060.7101.280.5140.6860.5460.