短路电流计算与检讨.pdf

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1、短路電流計算與檢討列印日期：94/10/06頁次：1一次側短路容量為：500MVA基值容量(BASE):1000KVA電源側Rp=0.002000P.U.電源側Xp=1000/(500*1000)=0.002000P.U.變壓器:TR#1三相1500KVA一次側電壓:22800V二次側電壓:380VRw=(0.483x0.01x1000)/(1000x22.8^2)=0.000009P.U.Xw=(0.178x0.01x1000)/(1000x22.8^2)=0.000003P.U.Rt=0.014x(1

2、000/1500)=0.009333P.U.Xt=0.051x(1000/1500)=0.034P.U.ΣR=R(基值容量)+Rw+Rt=0.002+0.000009+0.009333=0.011342ΣX=X(基值容量)+Xw+Xt=0.002+0.000003+0.034=0.036003故障點編號:1[配電盤:TMP-40N-01]銅匯流排3000(A)5M馬達倒灌容量1275HPZm=0.28x1000/1275=0.219608Rw=(0.0115x0.005x1000)/(1000x0.38^

3、2)=0.000398P.U.Xw=(0.0148x0.005x1000)/(1000x0.38^2)=0.000512P.U.ΣZ=((R+Rw)+j(X+Xw))

4、

5、Zm=0.032853P.U.ΣR=0.008613ΣX=0.031704(ΣX/ΣR)=3.6809Is=1000KVA/(sqrt(3)x0.38KVx0.032853)=46247AK=1.0869Ias=KxIs=50265.8643A<55KA故障點編號:2[配電盤:PCW-20N-01]XLPE1/C200SQ.MMx422S

6、Q.MM(G)140MRw=(0.0912x0.14x1000)/(1000x0.38^2)=0.088421P.U.Xw=(0.1221x0.14x1000)/(1000x0.38^2)=0.11838P.U.ΣR=R(故障點:1[配電盤:TMP-40N-01])+Rw=0.008613+0.088421=0.097034ΣX=X(故障點:1[配電盤:TMP-40N-01])+Xw=0.031704+0.11838=0.150084ΣX/ΣR=1.5467ΣZ=0.097034+j0.150084=0.

7、17872P.U.Is=1000KVA/(sqrt(3)x0.38KVx0.17872)=8501AK=1.0086Ias=KxIs=8574.1086A<25KA變壓器:TR#2三相2000KVA一次側電壓:22800V二次側電壓:380VRw=(0.483x0.03x1000)/(1000x22.8^2)=0.000028P.U.Xw=(0.178x0.03x1000)/(1000x22.8^2)=0.00001P.U.Rt=0.013x(1000/2000)=0.0065P.U.Xt=0.053x(

8、1000/2000)=0.0265P.U.ΣR=R(基值容量)+Rw+Rt=0.002+0.000028+0.0065=0.008528ΣX=X(基值容量)+Xw+Xt=0.002+0.00001+0.0265=0.02851故障點編號:3[配電盤:TMP-40N-02]銅匯流排4000(A)3M馬達倒灌容量1616.5HPZm=0.28x1000/1617=0.173214Rw=(0.0097x0.003x1000)/(1000x0.38^2)=0.000202P.U.Xw=(0.0107x0.003x

9、1000)/(1000x0.38^2)=0.000222P.U.ΣZ=((R+Rw)+j(X+Xw))

10、

11、Zm=0.025733P.U.ΣR=0.00641ΣX=0.024921(ΣX/ΣR)=3.8875Is=1000KVA/(sqrt(3)x0.38KVx0.025733)=59043AK=1.0948Ias=KxIs=64640.2764A<70KA故障點編號:4[配電盤:ATS#1]銅匯流排2500(A)15MRw=(0.0143x0.015x1000)/(1000x0.38^2)=0.00148

12、5P.U.Xw=(0.0181x0.015x1000)/(1000x0.38^2)=0.00188P.U.ΣR=R(故障點:3[配電盤:TMP-40N-02])+Rw=0.006411+0.001485=0.007896ΣX=X(故障點:3[配電盤:TMP-40N-02])+Xw=0.024921+0.00188=0.026801ΣX/ΣR=3.3943ΣZ=0.007896+j0.026801=0.02794P.U.Is=1