1、12204工作面短路整定說明書12204綜采工作面的裝機總功率為3674KW。3300V系統最大負荷為采煤機，功率為925KW，1140V系統最大負荷為皮帶機，總功率為400KW。信號及照明系統的電源均使用綜合保護裝置進行供電。負荷統計見下表序號設備名稱電動機型號臺數功率(KW)電壓V電流A備注1煤機YBCS4-40024003300120A*2截割電機YBC-55E125538092A牽引電機17.538012A油泵電機2刮板運輸機YBSD-400/200-4/8G24003300120A*23轉載機YBSD-315/160-4/8Y1315330094.5A4破碎機YBSS-200Y120

2、0330060A5乳化泵YBK2-355M2-422501140220A6噴霧泵YBK2-225M-4245114039A7回柱絞車222114015.4A8順槽皮帶機YBKZ-355S2-422001140140A*29回柱絞車118.5114013A10輸送機大巷皮帶YBKZ-355S2-422001140140A*211回柱絞車118.5114013A12水泵7.56608A13水泵2266024A總功率23733KW三、變壓器的選擇(1)基本計算公式 Sb=KxPecos式中：Sb-變壓器的計算容量，KVA; Kx-需用系數； Pe-所有設備的額定功率之和，KW; COS一加權平均功率

3、因數。(2)變壓器容量的確定根據變壓器容量基本計算公式和工作面負荷統計以及變電所的負荷情況，確定工作面共使用2臺移動變電站，1臺型號為KBSGZY-2500/10/3.3。1臺為KBSGZY-1250/10/1.2，膠帶機輸送大巷使用一臺KBSGZY-2000/10/1.2和一臺KBSGZY-500/10/0.66。能夠滿足工作面和運輸的使用要求。設備名稱型號設備臺數設備容量額定電壓移動變電站KBSGZY-2500/10/3.31250010000/3300移動變電站KBSGZY-1250/10/1.21125010000/1140移動變電站KBSGZY-2500/10/1.212000100

4、00/1140移動變電站KBSGZY-500/10/0.69150010000/660四、短路電流的計算及各開關的整定校驗短路電流計算根據煤礦井下低壓電網短路保護裝置的整定細則執行，先將電纜截面一律換算成50mm2，得到相應的電纜折算長度，再利用電纜折算長度，查煤礦井下低壓電網短路保護裝置的整定細則中相應變壓器的短路電流表，得到各短路點的兩相短路電流。所有開關按照供電線路短路保護的整定方法進行整定和校驗，計算公式：1、短路電流按照公式（1）計算Id(2)= Ue (1) 2、1200V級以下饋電開關過電流整定值按照公式（2）計算Iz=IQe+Ie (2)按照Id(2)/IZ1.5校核3、 電磁

5、起動器過流整定值按照IZIe并按照Id(2)/8IZ1.2校核4、 變壓器一次側電流整定按照公式（3）計算IZ1.21.4(IQe+kxIe)/kb (3)5、 照明信號綜保按照公式（4）計算整定IR=1.21.4Ie/Kb一）各短路點短路電流計算1、1#變壓器二次出口端的短路電流Id1計算/變壓器二次電壓3300v、容量2500KVA、系統短路容量按100MVA計算。系統電抗Xx=33002/100*106=0.1089電纜Lg=1km R0=0.217/km X0=0.069/km高壓電纜電阻、電抗 Rg=0.217*1=0.217 Xg=0.069*1=0.069變壓器電阻、電抗Rb1=

6、0.016113 Xb1=0.264236R=0.217/3.032+0.016113=0.039422 X=0.1089+0.069/3.032+0.264236=0.380652Id1(2)= Ue =4311.6A 2、運輸機尾處短路電流ID2計算(高速)MCPT3*70電纜的電阻、電抗：Lg=400m R0=0.315 X0=0.078XR1=0.078*0.4=0.0312 RR1=0.315*0.4=0.126R=0.039422+0.126=0.165422X=0.380652+0.0312=0.411852Id2(2)= Ue =3717.63A 3、運輸機尾處短路電流ID2計

7、算(低速)MCPT3*50電纜的電阻、電抗：Lg=400m R0=0.32 X0=0.081XR1=0.081*0.4=0.0324 RR1=0.32*0.4=0.128R=0.039422+0.128=0.167422X=0.380652+0.0324=0.413052Id3(2)= Ue =3702.1A 4、運輸機頭處短路電流ID2計算(高速)MCPT3*70電纜的電阻、電抗：Lg=200m R0=0.315 X0=0.078XR1=0.078*0.2=0.0156 RR1=0.315*0.2=0.063R=0.039422+0.063=0.102422X=0.380652+0.0156

8、=0.411852Id/4 (2)= Ue =4031.52A 5、運輸機頭處短路電流ID2計算(低速)MCPT3*50電纜的電阻、電抗：Lg=200m R0=0.32 X0=0.081XR1=0.081*0.2=0.0162 RR1=0.32*0.2=0.064R=0.039422+0.064=0.101422X=0.380652+0.0162=0.396852Id5(2)= Ue =4028.25A 6、采煤機處短路電流ID6計算MCPT3*70電纜的電阻、電抗：Lg=400m R0=0.315 X0=0.078XR1=0.078*0.4=0.0312 RR1=0.315*0.4=0.12

9、6R=0.039422+0.126=0.165422X=0.380652+0.0312=0.396852Id6(2)= Ue =3717.63A 7、轉載機處短路電流I/7計算(高速)MCPT3*70電纜的電阻、電抗：Lg=150m R0=0.315 X0=0.078XR1=0.078*0.15=0.0117 RR1=0.315*0.15=0.04725R=0.039422+0.04725=0.086672X=0.380652+0.0117=0.392352Id7(2)= Ue =4106.4A 8、轉載機處短路電流ID/8計算(低速)MCPT3*50電纜的電阻、電抗：Lg=150m R0=0

10、.32 X0=0.081XR1=0.081*0.15=0.01215 RR1=0.32*0.15=0.048R=0.039422+0.048=0.087422X=0.380652+0.01215=0.392772Id8(2)= Ue =4100.57A 9、破碎機處短路電流ID9計算MCPT3*50電纜的電阻、電抗：Lg=180m R0=0.32 X0=0.081XR1=0.081*0.18=0.01458 RR1=0.32*0.18=0.0576R=0.039422+0.0576=0.097022X=0.380652+0.01458=0.395202Id9(2)= Ue =4054.68A

11、10、2#變壓器二次出口端的短路電流Id10計算/變壓器二次電壓1200v、容量2000KVA、系統短路容量按100MVA計算。系統電抗Xx=12002/100*106=0.0144電纜Lg=0.6km R0=0.217/km X0=0.069/km高壓電纜電阻、電抗 Rg=0.217*0.6=0.1302 Xg=0.069*0.6=0.0414變壓器電阻、電抗Rb1=0.016113 Xb1=0.264236R=0.1302/8.332+0.016113=0.017989 X=0.0144+0.0414/8.332+0.264236=0.279233Id10(2)= Ue =2144.3A

12、11、1#乳化泵處短路電流ID11計算MYP3*50電纜的電阻、電抗：Lg=15m R0=0.32 X0=0.081XR1=0.081*0.015=0.001215 RR1=0.32*0.015=0.0048R=0.017989+0.0048=0.022789X=0.279233+0.001215=0.280448Id11(2)= Ue =2132.4A 12、2#乳化泵處短路電流ID12計算MYP3*50電纜的電阻、電抗：Lg=25m R0=0.32 X0=0.081XR1=0.081*0.025=0.002025 RR1=0.32*0.025=0.008R=0.017989+0.008=0

13、.025989X=0.279233+0.002025=0.281258Id12(2)= Ue =2124.22A 13、1#噴霧泵處短路電流ID13計算MYP3*16電纜的電阻、電抗：Lg=30m R0=1.4 X0=0.09XR1=0.09*0.03=0.0027 RR1=1.4*0.03=0.042R=0.017989+0.042=0.059989X=0.279233+0.0027=0.281933Id13(2)= Ue =2081.57A 14、2#噴霧泵處短路電流ID14計算MYP3*16電纜的電阻、電抗：Lg=40m R0=1.4 X0=0.09XR1=0.09*0.04=0.003

14、6 RR1=1.4*0.04=0.056R=0.017989+0.056=0.073989X=0.279233+0.0036=0.282833Id14(2)= Ue =2052.33A 15、絞車處短路電流ID15計算MYP3*16電纜的電阻、電抗：Lg=30m R0=1.4 X0=0.09XR1=0.09*0.03=0.0027 RR1=1.4*0.03=0.042R=0.017989+0.042=0.059989X=0.279233+0.0027=0.281933Id15(2)= Ue =2081.57A 16、順槽皮帶機處短路電流ID16計算MYP3*50電纜的電阻、電抗：Lg=25m

15、R0=0.32 X0=0.081XR1=0.081*0.025=0.002025 RR1=0.32*0.025=0.008R=0.017989+0.008=0.025989X=0.279233+0.002025=0.281258Id16(2)= Ue =2124.22A 17、3#變壓器二次出口端的短路電流Id17計算/變壓器二次電壓690v、容量500KVA、系統短路容量按100MVA計算。系統電抗Xx=6902/100*106=0.004761電纜Lg=0.6km R0=0.217/km X0=0.069/km高壓電纜電阻、電抗 Rg=0.217*0.6=0.1302 Xg=0.069*0

16、.6=0.0414變壓器電阻、電抗Rb1=0.004913 Xb1=0.036945R=0.1302/14.492+0.004913=0.005533 X=0.004761+0.0414/14.492+0.036945=0.041903Id17(2)= Ue =8162.45A 18、4#變壓器二次出口端的短路電流Id18計算/變壓器二次電壓1200v、容量2000KVA、系統短路容量按100MVA計算。系統電抗Xx=12002/100*106=0.0144電纜Lg=0.05m R0=0.217/km X0=0.069/km高壓電纜電阻、電抗 Rg=0.217*0.05=0.01085 Xg=

17、0.069*0.05=0.00345變壓器電阻、電抗Rb1=0.004866 Xb1=0.049766R=0.01085/8.332+0.004866=0.005022 X=0.0144+0.00345/8.332+0.049766=0.006422Id18(2)= Ue =7360A 19、轉載皮帶機處短路電流ID19計算MYP3*50電纜的電阻、電抗：Lg=25m R0=0.32 X0=0.081XR1=0.081*0.025=0.002025 RR1=0.32*0.025=0.008R=0.017989+0.008=0.025989X=0.279233+0.002025=0.281258

18、Id19(2)= Ue =2124.22A 二）開關整定值計算1、1#4組合開關3300V1）采煤機Ie=Pe/1.732Uecos=2*400/1.732*3.3*0.85=164.66180AIZ1=8Ie=1440 I(2)d/IZ1=3717/1440=2.581.52)轉載機高速Ie= Pe/1.732Uecos=315/1.732*3.3*0.8565AIZ2=8Ie=520 Id(2)/IZ=4106/520=7.81.53) 轉載機低速Ie= Pe/1.732Uecos=160/1.732*3.3*0.8533AIZ2=8Ie=264 Id(2)/IZ=4100/264=15.

19、51.52、2#6組合開關3300V1）運輸機頭高速 Ie= Pe/1.732Uecos=400/1.732*3.3*0.8583AIZ2=8Ie=664 Id(2)/IZ=3717/664=5.51.52) 運輸機頭低速 Ie= Pe/1.732Uecos=200/1.732*3.3*0.8542AIZ2=8Ie=336 Id(2)/IZ=4028/336=11.91.53）運輸機尾高速 Ie= Pe/1.732Uecos=400/1.732*3.3*0.8583AIZ2=8Ie=664 Id(2)/IZ=4031/664=6.071.54）運輸機尾低速 Ie= Pe/1.732Uecos=200/1.732*3.3*0.8542AIZ2=8Ie=336 Id(2)/IZ=3702/336=11.011.55）破碎機 Ie= Pe/1.732Uecos=200/1.732*3.3*0.8542AIZ2=8Ie=336 Id(2)/IZ=