工程中短路電流實用計算表

工程中短路電流實用計算表(有名值計算),,,,,,,,,,,,

系統(tǒng)電抗Ω,最大運行方式,最小運行方式,進線架空線路長度km,1.087,進線電纜長度km,1.071,"架空線和電纜

電抗值可查表

用實際值或

用平均值",,,"10±2*2.5/

0.4kVD,yn11",,

,0.37,0.47,電抗（Ω/km）,0.35,電抗（Ω/km）,0.08,,,,"變壓器

容量",油變阻抗系數(shù),"干變阻

抗系數(shù)"

,,,平均電抗（Ω/km）,0.35,平均電抗（Ω/km）,0.08,,,,50,4,4

,,,,0.38,,0.09,,,,63,4,4

1B變壓器容量kVA,800,短路電壓%,4.5,"1B變壓器電抗Ω

（10.5kV側）",6.20,,,,,80,4,4

2B變壓器容量kVA,1000,短路電壓%,6,"2B變壓器電抗Ω

（10.5kV側）",6.62,,,,,100,4,4

3B變壓器容量kVA,1250,短路電壓%,6,"3B變壓器電抗Ω

（10.5kV側）",5.29,出線容量kVA,,,,125,4,4

4B變壓器容量kVA,1600,短路電壓%,6,"4B變壓器電抗Ω

（10.5kV側）",4.13,總容量,"單臺

最大","短路

電壓%",,160,4,4

10kV出線1電抗Ω,架空線路長度km,,電纜長度km,,0.00,,,,,200,4,4

10kV出線2電抗Ω,架空線路長度km,,電纜長度km,,0.00,,,,,250,4,4

10kV出線3電抗Ω,架空線路長度km,,電纜長度km,,0.00,,,,,315,4,4

10kV出線4電抗Ω,架空線路長度km,,電纜長度km,,0.00,,,,,400,4,4

短路點,最大運行方式下,,,最小運行方式下,,,"最大峰值

短路電流kA",,,500,4,4

,"短路點阻抗Ω

（折算到10.5kV側）","三相短路電流kA

(折算到10.5kV側)","三相短路容量

MVA","短路點阻抗Ω

（折算到10.5kV側）","二相短路電流kA

(折算到10.5kV側)","二相短路容量

MVA",,,,630,4.5,6

用戶10kV母線,0.84,7.217,131.250,0.94,5.585,58.644,18.40,,,800,4.5,6

1B變壓器0.4kV側,7.04,0.861,15.661,7.14,0.735,7.721,,,,1000,4.5,6

2B變壓器0.4kV側,7.46,0.813,14.779,7.56,0.694,7.292,,,,1250,4.5,6

3B變壓器0.4kV側,6.13,0.989,17.985,6.23,0.843,8.848,,,,1600,4.5,6

4B變壓器0.4kV側,4.97,1.220,22.183,5.07,1.036,10.873,,,,2000,4.5,6

10kV出線1末端,0.00,0.000,0.000,0.00,0.000,0.000,,,,,,

10kV出線2末端,0.00,0.000,0.000,0.00,0.000,0.000,,,,,,

10kV出線3末端,0.00,0.000,0.000,0.00,0.000,0.000,,,,,,

10kV出線4末端,0.00,0.000,0.000,0.00,0.000,0.000,,,,,,

開關柜,保護點,"CT變比

(只填寫分子)",過電流,,,電流速斷,,,,,,

,,,整定值(A),時限(s),靈敏度,"整定值(A)

無時限",靈敏度,"整定值(A)

帶時限(0.5s)",靈敏度,"當線路部分無時限速斷整定無法滿足靈敏度要求時:

1、改用帶時限速斷整定；

2、或整定值與下級保護一樣，無選擇地動作，并以自動重合閘來補救;

3、或由于過電流整定時間為0.3S小于0.5S，可不裝設速斷保護",,

總進線,母線,600,4,0.3,11.64,14,3.32,0,0.00,,,

1B變壓器,1B,150,3,0.2,8.17,35,5.32,,,,,

2B變壓器,2B,200,3,0.2,5.79,25,5.59,,,,,

3B變壓器,3B,250,3,0.2,5.62,24,4.65,,,,,

4B變壓器,4B,300,3,0.2,5.75,25,3.72,帶時限(0.2s),靈敏度,,,

10kV出線1,出線1,,0,0.2,0.00,0,0.00,0,0.00,,,

10kV出線2,出線2,,0,0.2,0.00,0,0.00,0,0.00,,,

10kV出線3,出線3,,0,0.2,0.00,0,0.00,0,0.00,,,

10kV出線4,出線4,,0,0.2,0.00,0,0.00,0,0.00,,,

"表格使用條件：

1、短路電路中總電阻R≤1/3總電抗X（即忽略電阻）。

2、短路點遠離發(fā)電機端（無限大電源容量系統(tǒng)）。

3、為工程中實用計算值，算出的值比實際值稍大，但用稍大的值去校驗高壓電器更加安全。",,,,,"注意：

1、黃色填充表格為需要填寫部分，其他為自動計算部分不能修改。

2、過電流整定時當有自啟動的電機時須乘以2，靈敏度減半。",,,,,,,

"高壓電器短路

穩(wěn)定校驗",動穩(wěn)定校驗,,,熱穩(wěn)定校驗,,,,,,,,

高壓電器,用戶10kV母線側短路最大峰值電流(kA),"電器峰值

耐受電流(kA)",校驗結果,"短路熱效應Qt

(kA2*S)","電器短時

耐受電流(kA)","短時耐受

時間(S)",電器耐受熱效應I2thtth(kA2*S),,"校驗

結果",,,

"進線柜斷路器

1250A/31.5kA",18.40,80,滿足,18.23,31.5,4,3969,,滿足,,,

"進線柜

電流互感器",,80,滿足,,31.5,4,3969,,滿足,,,

"計量柜

電流互感器",,37.5,滿足,,15,4,900,,滿足,,,

"出線柜斷路器

630A/25kA"