零序电抗：XBS10= 3XBS1=33.6Ω XBS20*= 3XBS1*/ ZB=0.2541
1.3变压器等值电抗计算
(1) 变压器1B、2B等值电抗计算
XT1= XT2=(UK%/100)×(VN2×103/ SN)≈98.736Ω XT1*= XT2*=XT1/ ZB=98.736/132.25=0.7466 (2) 变压器3B、4B等值电抗计算 XT3= XT4 =(UK%/100)×(VN2/ SN)≈62.9805Ω XT3*= XT4*=XT3/ ZB=62.9805/132.25=0.4762 (3) 变压器5B、6B等值电抗计算
XT5=XT6= XT7=(UK%/100)×(VN2/ SN)≈83.89Ω XT6*= XT5*=0.6305
1.4发电机等值电抗计算
(1)发电机G1、G2电抗标幺值计算 XG1=0.7109×132.25=94.0165Ω XG1* = XG2*=X%SB /SG=0.7109
1.5最大负荷电流计算
(1) B母线最大负荷电流计算 (拆算到110KV)
IfhB ·max =2 S2B /U =2×15000/(1.732×115)=150.62A； (2) A母线最大负荷电流计算
IfhA ·max = 2S3B/U=2×20000/(1.732×115)=200.8234A