常用地線短路熱穩(wěn)定容量值

常用地線短路熱穩(wěn)定容量值一、常用鋼絞線、鋼芯鋁絞線熱穩(wěn)定允許電流值地線型號短路電流容量(kA2·s)地線熱穩(wěn)定允許電流值Id（kA）系統(tǒng)短路電流值Ik（kA）0.1s0.12s0.3s0.1s0.12s0.3sGJ-3567.757.074.4717.2115.719.94GJ-5012.2511.0710.106.3924.6022.4514.20GJ-7024.0115.5014.158.9534.4331.4319.88GJ-8031.3617.7116.1710.2239.3535.9222.72GJ-1004922.1420.2112.7849.1944.9128.40LGJ-70/404821.9120.0012.6548.6944.4428.11LGJ-95/5588.4529.7427.1517.1766.0960.3338.16LGJ-150/35220.546.9642.8727.11104.3595.2660.25計算說明：1、地線的短路電流容量計算公式：Q=其中：Q——地線短路電流容量，kA2·s；S——地線截面積，mm2；C——材料的熱穩(wěn)定系數(shù)，鋼取70，鋁取99。對于鋼芯鋁絞線，只考慮外層材質(zhì)的金屬做為載流部進(jìn)行計算。2、地線熱穩(wěn)定允許電流值計算公式：I其中：t——故障持續(xù)時間，500kV取0.1s，220kV取0.1s（0.12s），110kV取0.3s。3、系統(tǒng)短路電流值計算公式I其中：Id——系統(tǒng)單相接地電流值。二、常用鋁包鋼絞線熱穩(wěn)定允許電流值序號線材型號綜合截面比熱20℃直流電阻(Ω/km)電阻溫度系數(shù)地線短路熱穩(wěn)容量Q(kA2·s)地線允許短路電流Id(kA)系統(tǒng)允許短路電流Ik(kA)(mm2)(J/℃·kg)(1/℃)0.10.120.30.10.120.31LBGJ-50-20AC49.485041.73140.003616.7112.9311.807.4628.7326.2216.582LBGJ-50-40AC49.486140.88010.00427.2816.5215.089.5436.7033.5121.193LBGJ-80-20AC78.945041.08870.003642.5720.6318.8311.9145.8541.8626.474LBGJ-80-40AC78.946140.5550.00469.2926.3224.0315.2058.5053.4033.775LBGJ-100-20AC100.885040.85390.003669.3726.3424.0415.2158.5353.4333.796LBGJ-100-30AC100.885490.57640.003893.7130.6127.9417.6768.0362.1039.287LBGJ-100-40AC100.886140.43230.004113.6933.7230.7819.4774.9368.4043.268LBGJ-120-20AC121.215040.70980.0036100.2631.6628.9118.2870.3664.2340.629LBGJ-120-40AC121.216140.36290.004162.6940.3336.8223.2989.6381.8251.7510LBGJ-150-20AC148.075040.58170.0036149.4638.6635.2922.3285.9178.4349.6011LBGJ-150-30AC148.075490.39490.0038200.7344.8040.9025.8799.5690.8957.48計算說明：1、地線的短路電流容量計算公式：Q=其中：Q——地線的短路熱穩(wěn)定容量，kA2·sC——地線的熱容量，(J/℃·kg)α0——地線20℃時的電阻溫度系數(shù)，1/℃；R0——地線20℃時的電阻，Ω/km；t1——地線初始溫度，℃；可取40℃。t2——地線短路熱穩(wěn)定允許溫度，℃；鋁包鋼絞線的短路最高允許溫度取300℃。2、地線熱穩(wěn)定允許電流值計