井下短路電流計(jì)算要點(diǎn)

山西煤銷集團(tuán)古縣東瑞煤業(yè)有限公司井下供電系統(tǒng)整定計(jì)算書(shū)井下供電系統(tǒng)整定計(jì)算書(shū)二零一二年七月

短路電流計(jì)算1、電源系統(tǒng)電抗：取電源系統(tǒng)短路容量S=50MVASU2U2 avSS罟=2.2050折算到660V側(cè)=X?av=X?av2SIS)2丿二2.205xf0.69Y二0.009522010.5丿2、架空線路阻抗：寶豐至東瑞線：LGJ-240/30寶豐至東瑞線：LGJ-240/30鋼芯鋁絞線，4.286km電抗：X=x?L=0.369x4.286=1.58200電阻：R=r?L=0.130x4.286=0.557200fU)——av2IUv1丿fU)——av2IUv1丿10.5丿二0.006830fU)——av2

lU丿av12二0.5572xf06910.5丿2二0.002403、高壓電纜阻抗：高壓電纜型號(hào)：MYJV42-3X70電抗：X=x?L=0.008x0.4=0.003200電阻：R=r?L=0.307x0.4=0.122800折算到660V側(cè)2二0.0032xf06910.5丿2二0.00013820ru) av2lU丿av12二0.1228xf06910.5丿2二0.000530304、變壓器電抗：由變壓器技術(shù)參數(shù)查表得KBSGZY-500變壓器阻抗為:X=0.04270 R=0.00680TT由變壓器技術(shù)參數(shù)查表得KBSGZY-630變壓器阻抗為:X=0.04160 R=0.00560TT5、清煤斜巷最小短路電流計(jì)算：(1)電纜MY-3X50共60m,電纜MY-3X25共150m電纜MY-3X16共20m(2)低壓電纜阻抗X二x-L二0.081x0.06二0.00486010R=r-L=0.4484x0.06=0.026904010X=x-L=0.088x0.15=0.0132020R=r-L=0.8638x0.15=0.12957020X=x-L=0.09x0.02=0.0018030R=r-L=0.369x0.02=0.02738030(3)短路點(diǎn)短路回路總阻抗X工二0.009522+0.00683+0.0001382+0.0427+0.00486+0.0132+0.0018=0.0790二0.0024+0.0005303+0.0068+0.026904+0.12957+0.02738=0.19360X+R土=10.0792+0.19362=X+R土4）短路電流計(jì)算13= av13= av—S忌工690v3x0.20906=1905.5AS■av2Z6902S■av2Z6902x0.20906二1650.2A6、回風(fēng)巷刷擴(kuò)最小短路電流計(jì)算：(1)電纜MY-3X70共400m,電纜MY-3X25共200m低壓電纜阻抗X二x-L二0.078x0.4二0.0312010R=r-L=0.3151x0.4=0.12604010X=x-L=0.088x0.2=0.0176020R=r-L=0.8638x0.2=0.17276020短路點(diǎn)短路回路總阻抗X工二0.009522+0.00683+0.0001382+0.0427+0.0312+0.0176=0.10790二0.0024+0.0005303+0.0068+0.12604+0.17276=0.308540X=、；0.10792+0.308542=0.32690X4）短路電流計(jì)算IG)= av——= =1218.6AS <3Z工 v'3x0.3269U 690 10553.I)=av= =1055.3AS 2Z2 2x0.32697、1米皮帶最小短路電流計(jì)算：(1)電纜MY-3X50共200m,電纜MY-3X25共10m2）低壓電纜阻抗X=x-L=0.081x0.2=0.0162010R=r-L=0.4484x0.2=0.08698010X=x-L=0.088x0.01=0.0008860

R二r-L二0.8638x0.01二0.0086380203）短路點(diǎn)短路回路總阻抗X工二0.009522+0.00683+0.0001382+0.0427+0.0162+0.000886=0.076150二0.0024+0.0005303+0.0068+0.08698+0.008638=0.10810=、?0.076152+0.10812=0.132204）短路電流計(jì)算I（3）=av—SI（3）=av—S汽690込x0.1322=3013.7AS-av2Z6902x0.1322二2609.9A8、繞道刷擴(kuò)最小短路電流計(jì)算：（1）電纜MY-3X50共220m,電纜MY-3X35共150m電纜MY-3X25共100m2） 低壓電纜阻抗X二x-L二0.081x0.22二0.01782010R=r-L=0.4484x0.22=0.098648010X=x-L=0.084x0.15=0.0126020R=r-L=0.616x0.15=0.0924020X=x-L=0.088x0.1=0.0088030R=r-L=0.8638x0.1=0.086380303） 短路點(diǎn)短路回路總阻抗X工二0.009522+0.00683+0.0001382+0.0427+0.01782+0.0126+0.0088=0.098420二0.0024+0.0005303+0.0068+0.098648+0.0924+0.08638=0.2871580

X工=、:X±+R±二帯'0.098422+0.2871582=o.3O36Q4）短路電流計(jì)算690I（3）= av—S690I（3）= av—Sy3Z工I（2）= UI（2）= UavS2Z^呂6=113633A9、軌道巷刷擴(kuò)最小短路電流計(jì)算：（1）電纜MY-3X50共550m,電纜MY-3X25共50m（2）低壓電纜阻抗X=x-L=0.081x0.55=0.04455010R=r-L=0.4484x0.55=0.24662010X=x-L=0.088x0.05=0.00405020R=r-L=0.8638x0.05=0.04319020（3）短路點(diǎn)短路回路總阻抗X￡—0.009522+0.00683+0.0001382+0.0416+0.04455+0.00405=0.10690R=0.0024+0.0005303+0.0056+0.24662+0.04319=0.29835QX為=i：'X￡+R±=<0.10692+0.298352=0.3169Q4）短路電流計(jì)算av —I（3）=Uav — 690 —1257.0av —S <3Z￡ v'3X0.3169I（I（2）= UavS2敢=2x需啲=1088'6A10、中部水倉(cāng)最小短路電流計(jì)算：（1）電纜MY-3X50共900m,電纜MY-3X25共20m

2）低壓電纜阻抗X二x-L二0.081X0.9二0.729010R=r-L=0.4484x0.9=0.40365010X=x-L=0.088x0.02=0.00176020R=r-L=0.8638x0.02=0.0172760203）短路點(diǎn)短路回路總阻抗X工二0.009522+0.00683+0.0001382+0.0416+0.729+0.40365=0.13260R工二0.0024+0.0005303+0.0056+0.00176+0.017276=0.42940X為二\：X土+R土=<0.13262+0.42942 0.4494Q4）短路電流計(jì)算I（3）= av-s 、打ZI（3）= av-s 、打Z工<3x0.4494I（2）= 二S 2金690二767.7A2x0.449411、中央水泵房最小短路電流計(jì)算：（1）電纜MY-3X70共20m,電纜MY-3X35共30m電纜MY-3X16共30m2）低壓電纜阻抗X二x-L二0.075x0.02二0.00156010R=r-L=0.3151X0.02=0.0063010X=x-L=0.084x0.03=0.00252020R=r-L=0.616x0.03=0.01848020X=x-L=0.09x0.03=0.00270

R二r-L二1.369x0.03二0.04110303）短路點(diǎn)短路回路總阻抗XZ—0.009522+0.00683+0.0001382+0.0416+0.00156+0.00252+0.0027=0.06480Rz—0.0024+0.0005303+0.0056+0.0063+0.01848+0.0411=0.07440+R二\0.06482+0.07442=0.09862Q4）短路電流計(jì)算I（3）I（3）=S3Z^=爲(wèi)x009862=4039.5AI（2）—S 2ZZ■av——地點(diǎn)變壓器電纜三相短路電流/A兩相短路電流/A清煤斜巷KBSGZY-500MY-3X5060mMY-3X25 150mMY-3X1620m1905.51650.2回風(fēng)巷刷擴(kuò)KBSGZY-500MY-3X70400mMY-3X25200m1218.81055.51米皮帶機(jī)KBSGZY-500MY-3X50200mMY-3X25 10m3013.72019.9繞道刷擴(kuò)KBSGZY-500MY-3X50220mMY-3X35 150mMY-3X25 100m1312.51136.7軌道巷刷擴(kuò)KBSGZY-630MY-3X50550mMY-3X2550m1257.01088.6中部水倉(cāng)KBSGZY-630MY-3X50900mMY-3X2520m886.5767.7中央水泵房KBSGZY-630MY-3X7020mMY-3X35 30mMY-3X16 30m4039.53498.3

礦用橡套電纜的單位長(zhǎng)度電阻與電抗阻抗z°(Q/km)截面（mm2）4610162535507095120電阻Ro5.53.6932.1591.3690.86380.61600.44840.31510.23010.18電抗Xo0.1010.0950.0920.0900.0880.0840.0810.0780.0750.074礦用鎧裝電纜單位長(zhǎng)度的有效電阻和電抗（Q/km）電纜主芯線截面（mm2）銅鋁1KV及以下6KV1KV及以下6KVR0X0R0X0R0X0R0X045.3480.0959.0130.09563.5660.0906.0080.090102.1390.0733.6050.073161.3370.06571.340.0682.2530.06752.2570.068250.8560.06620.8570.0661.4410.06621.4450.066350.6100.06370.6120.0641.0300.06371.0300.064500.42830.06250.4290.0630.7210.06250.7220.063700.30440.06120.3060.0610.51450.06120.5160.061950.22540.06020.2260.0600.380.06020.380.060裸絞線的電阻和電抗導(dǎo)線型號(hào)電阻/Q/km線間幾何均距（m）0.60.81.01.251.502.002.503.003.504.00電抗(Q/km)LGJ-161.9260.3870.4010.4120.430.4440.4560.4660.474LGJ-251.2860.3740.3880.4000.4180.4320.4430.4530.461LGJ-350.7960.3590.3730.3850.4030.4170.4290.4380.446LGJ-500.6090.3510.3650.3760.3940.4080.4200.4290.437LGJ-700.4320.3640.3820.3960.4080.4170.425LGJ-950.3150.3530.3710.3850.3970.4060.414LGJ-1200.2550.3470.3650.3790.3910.4000.408LGJ-1500.2110.3400.3580.3720.3840.3980.401LGJ-1850.1630.3650.3770.3860.394LGJ-2400.1300.3570.3690.3780.386井下負(fù)荷整定計(jì)算一、供電系統(tǒng)簡(jiǎn)介：我礦設(shè)有兩回進(jìn)線，一回881線路來(lái)自寶豐35kV站(LGJ-240/30鋼芯鋁絞線,4.286km)、另一回584線路來(lái)賈寨35kV站(LGJ-185/25,鋼芯鋁絞線，5.086km)，均為10kV輸電線路；電源系統(tǒng)短路容量為50MVA。井下供電由井上變電所經(jīng)兩趟高壓鎧裝電纜(MYJV42-3X70,MYJV22-3X70)入井供電，井下中央變電所安裝兩臺(tái)變壓器(KBSGZY-500,KBSGZY-630)，分別由3#、4#高開(kāi)控制。二、礦井負(fù)荷統(tǒng)計(jì)：礦井負(fù)荷統(tǒng)計(jì)表工作面名稱設(shè)備名稱安裝臺(tái)數(shù)安裝容量使用容量設(shè)備需用系數(shù)功率因數(shù)最大電機(jī)功率計(jì)算負(fù)荷清煤斜巷給煤機(jī)2303015小水泵11111回風(fēng)巷刷擴(kuò)刮板機(jī)1404040噴漿機(jī)15.55.5小絞車111.411.41米皮帶機(jī)1米皮帶機(jī)115015075皮帶張緊車144繞道刷擴(kuò)刮板機(jī)1404055裝巖機(jī)15858噴漿機(jī)15.55.5軌道巷刷擴(kuò)刮板機(jī)312012040噴漿機(jī)15.55.5小絞車222.822.8小水泵11111

中部水倉(cāng)水泵2110550.850.8555中央水泵房主排水泵32951100.850.85110500變壓器380.4380.475630變壓器564.3324.3110三、饋電開(kāi)關(guān)整定：1、清煤斜巷饋電整定。（1）設(shè)備需用系數(shù)：k二0.286+0.714^^=0.286+0.714X15=0.547xsP 41N（2）負(fù)載電流I=k工I=0.547x1.15x41=25.8Axe過(guò)載電流I=1.21=1.2X25.8=30.96AZ過(guò)載電流整定為30A短路電流：I=8I+k工I=8x1.15x15+0.547x1.15x(41-15)=154.4Adzexe短路電流整定為160A(3)靈敏度校驗(yàn)I(2)1650.2I(2)1650.2160=10.3121.5dz短路電流校驗(yàn)合格，短路整定值靈敏可靠。2、回風(fēng)巷刷擴(kuò)饋電整定。1）設(shè)備需用系數(shù)：P 40k二0.286+0.714s=0.286+0.714X =0.788x 工P 56.9N負(fù)載電流：I=k工I=0.788x1.15x56.9=51.56Axe過(guò)載電流 I=1.21=1.2X51.56=61.9A過(guò)載電流整定為60A短路電流：I=8I+k工I=8x1.15x40+0.788x1.15x(56.9-40)=383.3Adzexe短路電流整定為380A3）靈敏度校驗(yàn)k二匕=蹙=2.78三1.5SI380

dz短路電流校驗(yàn)合格，短路整定值靈敏可靠。3、1米皮帶機(jī)饋電整定。1）設(shè)備需用系數(shù)：k二0.8

x(2)負(fù)載電流：I=k工I=0.8x1.15x154=141.68Axe過(guò)載電流 I=1.21=1.2X141.68=170A過(guò)載電流整定為170A短路電流：I=8I+k工I=8x1.15x150+0.8x1.15x(154-150)=1383.6Adzexe

短路電流整定為1300Ak=I12L=3k=I12L=30199=1.55^1.5SI1300dz短路整定值靈敏可靠。短路電流校驗(yàn)合格4、繞道刷擴(kuò)饋電整定。（1）設(shè)備需用系數(shù)：P55k二0.286+0.714s=0.286+0.714X =0.665x 乙P 103.5N（2）負(fù)載電流：I=k工I=0.665x1.15x103.5=79.2Axe過(guò)載電流 I=1.21=1.2X79.2=95AZ過(guò)載電流整定為100A短路電流：I=8I+k工I=8x1.15x55+0.665x1.15x（103.5-55）=543.1Adzexe短路電流整定為540AW.T.5（3）靈敏度校驗(yàn)W.T.5kSdz短路電流校驗(yàn)合格，短路整定值靈敏可靠。5、軌道巷刷擴(kuò)饋電整定。（1）設(shè)備需用系數(shù)：P 40k二0.286+0.714s=0.286+0.714X =0.465x 乙P 159.3N2）負(fù)載電流：

I=k工I=0.465x1.15x159.3=85.2Axe過(guò)載電流I=1.21=1.2X85.2=102.3AZ過(guò)載電流整定為100A短路電流：I=8I+k工I=8x1.15x55+0.465x1.15x（159.3-40）=431.8Adzexe短路電流整定為430A戸嚳=2.53+（戸嚳=2.53+kSdz短路電流校驗(yàn)合格，短路整定值靈敏可靠6、中部水倉(cāng)饋電整定。（1）設(shè)備需用系數(shù)：k二0.85x2）負(fù)載電流：I=k工I=0.85x1.15x55=53.76Axe過(guò)載電流I=1.2I=1.2X53.76=64.5AZ過(guò)載電流整定為65A短路電流：I=8I+k工I=8x1.15x55=506Adzexe短路電流整定為500A（3）靈敏度校驗(yàn)I(2)767.7500=1.5321.5dz短路電流校驗(yàn)合格，短路整定值靈敏可靠。7、中央水泵房饋電整定。（1）設(shè)備需用系數(shù)：k二0.85x（2）負(fù)載電流：I=k工I=0.85x1.15x110=107.5Axe過(guò)載電流 I=1.21=1.2X107.5=129AZ過(guò)載電流整定為130A短路電流：I=8I+k工I=8x1.15x110=1012Adzexe短路電流整定為1000A（3）靈敏度校驗(yàn)I(2)3498.3I(2)3498.31000=3.521.5dz短路電流校驗(yàn)合格，短路整定值靈敏可靠。饋電地點(diǎn)工作容量過(guò)載電流短路電流最小兩相短路電流靈敏度清煤斜巷41301501650.210.31回風(fēng)巷刷擴(kuò)56.603801055.52.781米皮帶15417013002019.91.55繞道刷擴(kuò)103.5955401136.72.105軌道巷刷擴(kuò)159.31004301088.62.53中部水倉(cāng)5565500767.71.54中央水泵房11013010003498.33.5四、高壓開(kāi)關(guān)整定：1、4#高開(kāi)整定：（1）負(fù)荷統(tǒng)計(jì)：Py二30+ll+40+5.5+11.4+150+4+25+40+58+5.5=380.4kWZu（2）設(shè)備需用系數(shù)：k二0.286+0.714Ps=0.286+0.714X=0.427x yP 380.4N（3）負(fù)載電流：I=kyI=0.427X1.15X380.4X0.69/10.5=12.27Axe過(guò)載電流： I=121=1.2X12.27=14.72AZ4#高開(kāi)型號(hào)PBG-200