IEC 60909-0:2016 · 国家标准 · 电气

IEC 60909 短路电流

完整的IEC 60909-0:2016故障电流分析,含国家标准选择、K_T和K_G阻抗修正系数及发电机贡献。

国家标准 / 规范:
IEC 60909 VDE 0102 (DE) BS 7639 (UK) GB/T 15544 (CN) JIS C 4620 (JP) IS 13234 (IN)
c_max = 1.10 (LV) / 1.10 (HV)
System One-Line Diagram
SUPPLY Un · Z_Q Z_src R + jX TR K_T= CABLE r·l x·l FAULT BUS G K_G F FAULT CURRENTS · IEC 60909 I"k = ip = κ = Ib = Ith = μ = R/X = Z_k = NA = IEC c = Fault= 3ph K_T =
R/X:
κ:
Z_k: Ω
NA: IEC
c: 1.10
System Parameters
kV
线对线额定电压
Hz
s
用于热等效电流计算(典型值0.5 s)
电网进线(电源)
Ω
Ω
PCC处供电网络阻抗
变压器(可选)
MVA
%
kW
Pk=0时使用R/X≈0.05近似
电缆(可选)
Ω/km
Ω/km
km
同步发电机(可选)
MVA
pu
典型:0.12–0.25 pu
R/X
典型:0.05–0.15
Select national annex, enter parameters, and click Calculate.
Includes K_T (transformer) and K_G (generator) impedance correction factors.
标准与国家附录
IEC 60909-0:2016
International standard. c_max = 1.10 (LV + HV). Defines equivalent voltage source method, κ factor, m/n factors, K_T and K_G correction.
VDE 0102 (Germany)
German national implementation of IEC 60909-0. c_max = 1.05 for LV networks (≤ 1 kV), 4.5% lower maximum fault currents. Standard for switchgear selection in Germany and Austria.
BS 7639 (UK)
British standard for short-circuit calculation, harmonised with IEC 60909-0. Same c-factor table as IEC. Used alongside Engineering Recommendation G74 for UK distribution networks.
GB/T 15544 (China)
Chinese national standard harmonised with IEC 60909. Symmetrical component method, same c-factors. Required for grid fault level studies in China. Supplemented by DL/T 5222 for power system planning.
JIS C 4620 (Japan)
Japanese switchgear standard referencing IEC 60909 method for rated short-circuit withstand current. 50/60 Hz mixed grid. Used with IEC 62271-200 for LV/MV switchgear selection.
IS 13234 (India)
Indian standard for three-phase fault level calculation based on IEC 60909 method. 50 Hz grid. Used with IS 13118 for switchgear selection across HV/MV/LV levels.

常见问题

与/tools/short-circuit-iec有何区别?
旗舰版增加了国家标准选择(VDE 0102 LV cmax=1.05)、K_T和K_G阻抗修正系数以及含μ因数的同步发电机贡献计算。
什么是K_T?
K_T=0.95×cmax/(1+0.6×x_T),见IEC 60909公式(12a),用于修正变压器分接开关位置和故障前电压偏差的影响。
什么是K_G?
K_G依据IEC 60909 §3.6.1公式(18)修正发电机运行电压和负荷角的影响。
什么是μ因数?
μ修正近发电机短路的分断电流Ib。远离发电机时μ=1,即Ib=I"k。
VDE 0102与IEC 60909有何不同?
VDE 0102是德国版IEC 60909,主要区别:低压(≤1 kV)cmax=1.05(IEC=1.10),最大短路电流低4.5%。
与ANSI/IEEE C37方法的比较?
IEC 60909采用等效电压源法(故障点c×Un/√3),无需潮流预计算。ANSI/IEEE C37采用Thevenin等效电压除法。IEC 60909是欧洲、中东、亚洲、非洲的标准方法。