井下设备的整定计算

公式：I
=K Ie
z
Ie ——保护干线中所有电机额定电流之和，A; 公式：I
=IQe+K Ie
z
Ie ——其余电机额定电流之和，A;
二次侧过载整定电流：I/
zz =K
e
=0.75×1.15×577.4=498A
二次侧短路保护电流：I
zz =I
Qe
+K
e
=6×1.15×180+0.75×1.15×
397.4=1585A （取皮带机电机为干线最大负载）
二次侧过载整定电流：I/
zz =K
e
=0.75×0.67×1020=513A
二次侧短路保护电流：I
zz =I
Qe
+K
e
=6×0.67×500+0.75×0.67×
520=2271A （取采煤机为干线最大负载）
二次侧过载整定电流：I /
zz =K
e
=0.75×0.67×730=367A
二次侧短路保护电流：I
zz =I
Qe
+K
e
=6×0.67×160+0.75×0.67×
570=929A （取后溜机头为干线最大负载）
回风顺槽馈电的过载整定计算:I/=K
e
=0.75×1.15×101.4=87A
回风顺槽馈电的短路保护计算:I=I
Qe +K
e
=6×1.15×75+0.75×1.15×
26.4=540A （取无极绳电机为干线最大负载）
运输顺槽馈电的过载整定计算:I/=K
e
=0.75×1.15×265.5=230A
运输顺槽馈电的短路保护计算:I=I
Qe +K
e
=6×1.15×180+0.75×1.15×
85.5=1316A （取皮带电机为干线最大负载）
馈电过载整定电流：I/
zz =K
e
=0.75×1.15×180.5=156A
馈电短路保护电流：I
zz =I
Qe
+K
e
=6×1.15×40+0.75×1.15×
140.5=397A （取刮板机电机为干线最大负载）
二次侧过载整定电流：I/
zz =K
e
=0.67×135=90A
二次侧短路保护电流：I
zz =I
Qe
+K
e
=8×90=720A
馈电过载整定电流：I/
zz =K
e
=0.75×1.15×41.5=36A
馈电短路保护电流：I
zz =I
Qe
+K
e
=6×1.15×18.5+0.75×1.15×
23=147A （取1#皮带电机为干线最大负载）
馈电过载整定电流：I/
zz =K
e
=0.75×1.15×26=22A
馈电短路保护电流：I
zz =I
Qe
+K
e
=6×1.15×18.5+0.75×1.15×
7.5=134A （取液压站油泵电机为干线最大负载）
D10馈电过载整定电流：I/
zz =K
e
=0.75×1.15×83=72A
D10馈电短路保护电流：I
zz =I
Qe
+K
e
=6×1.15×45+0.75×1.15×
38=343A （取1#挡水墙水泵电机为干线最大负载）
馈电过载整定电流：I/
zz =K
e
=0.75×1.15×111.5=96A
馈电短路保护电流：I
zz =I
Qe
+K
e
=6×1.15×90+0.75×1.15×
21.5=640A （取主皮带电机为干线最大负载）
馈电过载整定电流：I/
zz =K
e
=0.75×1.15×40=35A
馈电短路保护电流：I
zz =I
Qe
+K
e
=6×1.15×22+0.75×1.15×
18.5=168A （取副井井底主水泵电机为干线最大负载）
二次侧过载整定电流：I/
zz =K
e
=0.75×1.15×302=260A
二次侧短路保护电流：I
zz =I
Qe
+K
e
=6×1.15×90+0.75×1.15×
212=804A （取主皮带机电机为干线最大负载）
I d1(2)=
、——短路回路内一相电阻、电抗值的总和，Ω；
——根据三相短路容量计算的系统电抗值，Ω；
、——高压电缆的电阻、电抗值，Ω；
——矿用变压器的变压比;
、——矿用变压器的电阻、电抗值，Ω；
、——低压电缆的电阻、电抗值，Ω；
162535507095
电阻
电抗
电阻
电抗
三.10KV高压系统的短路电流计算
1.井下变电所800KVA变压器二次出口短路电流计算：
1）高压电缆电阻、电抗：
从井上到井下变电所，电缆为3×95mm2
L=600m=0.6km
查表得R
0=0.229Ω/km X
=O.O96Ω/km
=0.1374/14.52+0.0135=0.0142Ω
=0.0576/14.52+0.1072+0.0288=0.1363Ω
I d1(2)===2517A
==3.13>1.5 满足灵敏度要求。

=0.3389/14.52+0.0068=0.0084Ω
=0.1233/14.52+0.0427+0.0288=0.0721Ω
I d1(2)===4752A
==3>1.5 满足灵敏度要求。

=0.6869/8.32+0.0101=0.0201Ω
=0.2089/8.32+0.0931+0.0288=0.1249Ω
I d1(2)===4743A
==2.1>1.5 满足灵敏度要求。

=0.6869/8.32+0.0135=0.0234Ω
=0.2089/8.32+0.1072+0.0288=0.1390Ω
I d1(2)===4257A
==4.6>1.5 满足灵敏度要求。

=0.0142+0.0435=0.0577Ω
=0.1363+0.0060=0.1423Ω
I d1(2)===2247A
==13.4>1.5 满足灵敏度要求。

=0.0142+0.0992=0.1134Ω
=0.1363+0.0323=0.1686Ω
I d1(2)===1698A
==2.65>1.5 满足灵敏度要求。

=0.0142+0.4089=0.5509Ω
=0.1363+0.0564=0.1927Ω
I d1(2)===591A
==4.02>1.5 满足灵敏度要求。

=0.0142+0.0696=0.0838Ω
=0.1363+0.0096=0.0013Ω
I d1(2)===4116A
==30.7>1.5 满足灵敏度要求。

=0.0084+0.1349=0.1433Ω
=0.0721+0.0332=0.1053Ω
I d1(2)===1940A
==2.8>1.2 满足灵敏度要求。

=0.0084+0.1305=0.1389Ω
=0.0721+0.0321=0.1042Ω
I d1(2)===1987A
==45>1.2 满足灵敏度要求。

=0.1389+0.0548=0.1937Ω
=0.1042+0.0036=0.1078Ω
I d1(2)===1556A
==15>1.2 满足灵敏度要求。

=0.1937+0.4110=0.6047Ω
=0.1078+0.0270=0.1348Ω
I d1(2)===557A
==5.36>1.2 满足灵敏度要求。

=0.0084+0.0096=0.0180Ω
=0.0721+0.0024=0.0745Ω
I d1(2)===4501A
==2.7>1.2 满足灵敏度要求。

=0.0084+0.4864=0.4948Ω
=0.0721+0.0320=0.1041Ω
I d1(2)===682A
==5.7>1.2 满足灵敏度要求。

=0.4948+0.0685=0.5633Ω
=0.1041+0.0045=0.1086Ω
I d1(2)===601A
==5>1.2 满足灵敏度要求。

=0.5633+0.1370=0.7003Ω
=0.1086+0.0090=0.1176Ω
I d1(2)===486A
==3.6>1.2 满足灵敏度要求。

=0.7003+0.1096=0.8099Ω
=0.1176+0.0072=0.1248Ω
I d1(2)===421A
==2.5>1.2 满足灵敏度要求。

=0.0084+0.3480=0.3564Ω
=0.0721+0.0480=0.1201Ω
I d1(2)===917A
==2.3>1.5 满足灵敏度要求。

=0.0201+0.0756=0.0957Ω
=0.1249+0.0317=0.1566Ω
I d1(2)===3269A
==1.22>1.2 满足灵敏度要求。

=0.0201+0.0496=0.0697Ω
=0.1249+0.0162=0.1411Ω
I d1(2)===3812A
==6.8>1.2 满足灵敏度要求。

=0.0234+0.0620=0.0854Ω
=0.1390+0.0202=0.1592Ω
I d1(2)===3321A
==3.9>1.2 满足灵敏度要求。

=0.0234+0.1023=0.1267Ω
=0.1390+0.0333=0.1723Ω
I d1(2)===2805A
==3.3>1.2 满足灵敏度要求。

=0.0234+0.0620=0.0854Ω
=0.1390+0.0202=0.1592Ω
I d1(2)===3321A
==3.9>1.2 满足灵敏度要求。

=0.0234+0.1023=0.1267Ω=0.1390+0.0333=0.1723Ω I d1(2)===2805A
==3.3>1.2 满足灵敏度要求。