110kv某降壓變電所設(shè)計副本(編輯修改稿)
2024-07-31 21:25 本頁面
【文章內(nèi)容簡介】 1/200)(+) = 0 （負(fù)值取0）X7 = 50(100/372) = X8 = (1/2)40(100/372) = X9 = (1/2)30(100/372) = X10 = 20(100/372) = X11 = 50(100/372) = X12 = 15(100/) = X13 = 10(100/) = X14 = 5(100/) = X15 = (1/2)(100/) = X16 = (1/2)8(100/) = X17 = (1/2)2(100/) = X18 = 12(100/) = X19 = (1/2)20(100/) = 當(dāng)K1點短路時的簡化等值網(wǎng)絡(luò)圖如下： X20 K1 X4 X5 X22 X6 X21簡化為： X20 K1 X25X20 = X1+X2+X3 = X21 = X7/X8/X9/X10/X11 = X22 = X12//X13//X14//X15//X16//X17//X18//X19 = X23 = X6+X21 = X24 = X5+X22 = X25 = X23//X24+X3 = K1點短路時:SNE = (75/) = Xf = (X29/X25)/(X20+X25) = ()/(+) = 查運算曲線得：t=0s時，I’1* = t=4s時，I”1* = I’1 = I’1* (SN/) = (115) = (kA)I”1 = I”1* (SN/) = (115) = (kA)取沖擊系數(shù)Kim=，則：沖擊電流ich = ’1 ==（kA）當(dāng)K2點短路時簡化等值網(wǎng)絡(luò)圖如下：短路容量：Sk’1 = IUk1 =115 = (MVA) Sk”1 = IUk1 =115 = (MVA) X20 X21 X23 K2 X6 K2 X22 X22X20 = X1+X2+X3+X4 = X21 = X5+X12//X13//X14//X15//X16//X17//X18//X19 = X23 = X6+X20//X21 = Xf = X23//X22 = 查運算曲線得：t=0s時，I’2* = t=4s時，I”2* = I’2 = I’2* (SN/) = (37) = (kA)I”2 = I”2* (SN/) = (37) = (kA)取沖擊系數(shù)Kim=，則：沖擊電流ich = ’2 ==（kA）短路容量：Sk’2 = IUk2 = = (MVA) Sk”2 = IUk2 = = (MVA)當(dāng)K3點短路時簡化等值網(wǎng)絡(luò)圖如下：X20 X5 K3 X22 X23 K3 X22X21X20 = X1+X2+X3+X4 = X21 = X6+X7//X8//X9//X10//X11 = X22 = X23 = X20//X21+X5 = Xf = X23//X22 = 查運算曲線得：t=0s時，I’3* = t=4s時，I”3* = I’3 = I’3* (SN/) = () = (kA)I”3 = I”3* (SN/) = () = (kA)取沖擊系數(shù)Kim=，則：沖擊電流ich = ’3 ==（kA）短路容量：Sk’3 = IUk3 = = (MVA) Sk”3 = IUk3 = = (MVA) 短路電流計算結(jié)果表短路點編號基準(zhǔn)電壓短路電流(kA)沖擊電流(kA)短路容量(MVA)t=0t=4sK1115K2K3第五章 設(shè)備的選擇1 高壓斷路器和隔離開關(guān)的原理與選擇 高壓斷路器的選擇 根據(jù)短路電流計算，查表選得個電壓等級的斷路器為：型號電壓(kV)額定電流(A)斷開電流(kA)斷開容量(MVA)熱穩(wěn)定電流(kA)額定最大1s4s5s10sSN410G106000105180017312085SW2353510001500SW4110G1101261000300021 (2) 動穩(wěn)定校驗，校驗式為：ies ≥ ish ：①——10kV： ies ＝105 kA ≥ ish ＝ 滿足要求；②——35kV： ies ＝ ≥ ish ＝ 滿足要求；③——110kV：ies ＝ ≥ ish ＝ kA 滿足要求。(2) 熱穩(wěn)定校驗，校驗式為：I2tt ≥ Qk ①——10kV：I2tt ＝1=≥ Qk ＝17321=29929千焦?jié)M足要求；②——35kV:I2tt ＝4=≥ Qk ＝4=滿足要求；③——110kV：I2tt ＝5=≥ Qk ＝2125=2205千焦?jié)M足要求。 隔離開關(guān)的選擇 根據(jù)短路電流計算，查表選得個電壓等級的隔離開關(guān)為：型號額定電壓(kV)額定電流(A)動穩(wěn)定電流(kA)熱穩(wěn)定電流(s)(kA)
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