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110kv某降壓變電所設(shè)計(jì)副本(編輯修改稿)

2024-07-31 21:25 本頁(yè)面
 

【文章內(nèi)容簡(jiǎn)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(diǎn)短路時(shí)的簡(jiǎn)化等值網(wǎng)絡(luò)圖如下: X20 K1 X4 X5 X22 X6 X21簡(jiǎn)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(diǎn)短路時(shí):SNE = (75/) = Xf = (X29/X25)/(X20+X25) = ()/(+) = 查運(yùn)算曲線得:t=0s時(shí),I’1* = t=4s時(shí),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(diǎn)短路時(shí)簡(jiǎn)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(yùn)算曲線得:t=0s時(shí),I’2* = t=4s時(shí),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(diǎn)短路時(shí)簡(jiǎn)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(yùn)算曲線得:t=0s時(shí),I’3* = t=4s時(shí),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(jì)算結(jié)果表短路點(diǎn)編號(hào)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(kāi)關(guān)的原理與選擇 高壓斷路器的選擇 根據(jù)短路電流計(jì)算,查表選得個(gè)電壓等級(jí)的斷路器為:型號(hào)電壓(kV)額定電流(A)斷開(kāi)電流(kA)斷開(kāi)容量(MVA)熱穩(wěn)定電流(kA)額定最大1s4s5s10sSN410G106000105180017312085SW2353510001500SW4110G1101261000300021 (2) 動(dòng)穩(wěn)定校驗(yàn),校驗(yàn)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(yàn),校驗(yàn)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(kāi)關(guān)的選擇 根據(jù)短路電流計(jì)算,查表選得個(gè)電壓等級(jí)的隔離開(kāi)關(guān)為:型號(hào)額定電壓(kV)額定電流(A)動(dòng)穩(wěn)定電流(kA)熱穩(wěn)定電流(s)(kA)
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