煤矿机电保护整定计算.docx
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煤矿机电保护整定计算.docx
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煤矿机电保护整定计算
××煤矿供电系统保护整定计算
编审
科
制:
核:
长:
二〇一〇年九月五日
目录
第一节短路计算······························································································2
第2节动、热稳定性校验··············································································10
第3节扇风机房整定计算··············································································15
第4节压风机房整定计算··············································································15
第5节主井绞车房整定计算··········································································15
第6节副井绞车房整定计算··········································································16
第7节中央变电所整定计算··········································································16
第8节二采变电所整定计算··········································································18
第9节900变电所整定计算···········································································21
第10节机头变电所整定计算··········································································22
第11节南翼变电所整定计算······································································24
××煤矿供电系统整定计算
第1节短路计算
一、计算依据
1、唐口110kV变电所35kV母线短路电流:
Id3max=5.689kA
Id3min=2.799kA
2、兴福集35kV变电所35kV母线短路电流:
Id3max=2.323kA
Id3min=1.496kA
二、短路计算
(1)我矿35kV变电所6kV侧母线短路电流计算
1、××矿线时:
(1)系统阻抗:
最大运行方式:
x0min=
最小运行方式:
x0min=
(2)线路阻抗:
查《煤矿电工手册》第二分册(下同)表2-2-11得:
xl=
Ω/km×17km=8..2042Ω
(3)主变压器电抗:
xTr=
(4)主变压器电抗:
n=
(5)用xx矿线时我矿35KV变电所35KV母线侧短路电流:
(6)I(3)dcmin=
(3IdC)max=
373Eϕ==1.786kAx0min+xl3.7551+8.2042373Eϕ==1.349kAx0max+xl7.6323+8.2042
(3IdC)min=
6kV母线侧短路电流:
(3IdC)max=
x0min
5.5556×373nEϕ==5.7277kA+xl+xTr3.7551+8.2042+8.7616
(3IdC)min=
5.5556×373nEϕ==4.8249kAx0max+xl+xTr7.6323+8.2042+8.7616
2、兴王线时:
(1)系统阻抗:
最大运行方式:
x0min=最小运行方式:
x0min=
(2)线路阻抗:
查表2-2-11得:
xl=0.272+0.42Ωkm×9.2km=4.4399Ω
EϕI
(3)dmax
=
373=9.19622.323
373Eϕ==14.2799(3)1.496Idmin
(3)主变压器电抗:
xTr=
2Uk%UN⋅Tr8370002⋅=×Ω=8.7616Ω100SN⋅Tr10012500000
(4)主变压器变比:
n=
35=5.55566.3
3
(5)用兴王线时我矿35kV变电所35kV母线侧短路电流:
(3IdC)max=
373Eϕ==1.5667kAx0min+xl9.1962+4.4399373Eϕ==1.1412kAx0max+xl14.2799+4.4399
(3IdC)min=
6kV母线侧用兴王线时短路电流:
最大运行方式:
(3IdC)max=
x0min
nEϕ5.5556×37/3==5.2989kA+xl+xTr9.1962+4.4399+8.7616
最小运行方式:
(3IdC)min=
5.5556×373nEϕ==4.3187kAx0max+xl+xTr14.2799+4.4399+8.7616
以上计算显示我矿6kV母线侧发生短路,兴王线路供电时短路电流较小,为满足供电安全性与可靠性,应以××矿线的最大运行方式下的短路电流与兴王线的最小运行方式下的短路电流配合为计算依据。
则有我矿35kV变电所6kV母线侧短路电流为:
(3最大运行方式:
IdC)max=5.7277kA(3最小运行方式:
IdC)min=4.3187kA
35kV母线侧短路则有
(3最大运行方式:
IdC)max=1.786kA(3最小运行方式:
IdC)min=1.1412kA
(二)我矿6kV各支路短路电流计算以我矿35kV变电所6kV侧母线短路电流为依据,计算各支路末端短路电流:
4
35kV变电所6kV侧母线短路阻抗:
最大运行方式:
x0min=最小运行方式:
x0max=
EϕI
(3)dmax
=
63=0.6049Ω5.7277
63Eϕ==0.8022Ω(3)Idmin4.3187
1、中央变电所母线短路电流:
至中央变电所电缆为MYJV426/6kV3×2401250米,阻抗查《煤矿电工手册》第二分册(下同)表2-2-13、14得:
x1=0.082+0.082×1.25=0.1415Ω
最大运行方式:
(Id3)max=1
6.33Eϕ==4.8734kAx0min+x10.6049+0.1415
最小运行方式:
(Id3)min=1
6.33Eϕ==3.8545kAx0max+x10.8022+0.1415
2、压风机房母线侧短路电流:
至压风机房电缆为YJV226/6kV3×35350米,阻抗为:
x2=0.532+0.082×0.35=0.1876Ω
最大运行方式:
(Id32)max=
6.33Eϕ==4.5899kAx0min+x20.6049+0.1876
最小运行方式:
(I
d32)min=
6.33Eϕ==3.675kAx0max+x20.8022+0.1876
3、副井绞车房短路电流:
5
(1)6kV母线侧短路电流:
至副井绞车房电缆为:
YJV226/6kV3×50270m,阻抗为:
x3=0.372+0.082×0.27=0.1022Ω
最大运行方式:
(Id3)max=3
6.33Eϕ==5.1443kAx0min+x30.6049+0.1022
最小运行方式:
(Id3)min=3
6.33Eϕ==4.022kAx0max+x30.8022+0.1022
(2)副井绞车房整流变压器二次侧短路电流折算至高压侧:
(以大容量,小阻抗的1#整流变计算)
xTr3=
2Uk%UNTr35.563002⋅=×=1.7464Ω100SNTr31001250000
最大运行方式:
(Id3)max=31
x0min
6.33Eϕ==1.4826kA+x3+xTr30.6049+0.1022+1.7464
最小运行方式:
(Id3)min=31
x0max
6.33Eϕ==1.3723kA+x3+xTr30.8022+0.1022+1.7464
4、主井绞车房短路电流:
(1)6kV母线侧短路电流:
至副井绞车房电缆为:
YJV226/6kV3×50300m,阻抗为:
x3=0.372+0.082×0.3=0.1136Ω
最大运行方式:
6
(Id34)max=
6.33Eϕ==5.0627kAx0min+x40.6049+0.1136
最小运行方式:
(Id34)min=
6.33Eϕ==3.972kAx0max+x40.8022+0.1136
(2)主井绞车房整流变压器二次侧短路电流折算至高压侧:
(以大容量,小阻抗的1#整流变计算)
xTr4
2Uk%UNTr35.563002=⋅=×=1.7464Ω100SNTr31001250000
最大运行方式:
()Id341max=
x0min
6.33Eϕ==1.4758kA+x4+xTr40.6049+0.1136+1.7464
最小运行方式:
()Id341min=
x0max
6.33Eϕ==1.3664kA+x4+xTr40.8022+0.1136+1.7464
5、通风机房母线短路电流:
至通风机房电缆为:
YJV226/6kV3×35290m,阻抗为:
x5=0.532+0.082×0.29=0.1555Ω
最大运行方式:
(Id3)max=5
6.33Eϕ==4.7837kAx0min+x50.6049+0.1555
最小运行方式:
(Id3)min=5
6.33Eϕ==3.7982kAx0max+x50.8022+0.1555
6、锅炉房变电所母线短路电流:
至锅炉房变电所电缆为:
YJV226/6kV3×35430m,阻抗为:
7
x6=0.532+0.082×0.43=0.2305Ω
最大运行方式:
(Id3)max=6
6.33Eϕ==4.3542kAx0min+x60.6049+0.2305
最小运行方式:
(Id3)min=6
6.33Eϕ==3.5224kAx0max+x60.8022+0.2305
7、洗煤厂母线短路电流:
至洗煤厂电缆为:
YJV226/6kV3×50680m,阻抗为:
x7=0.372+0.082×0.68=0.2575Ω
最大运行方式:
(Id3)max=7
6.33Eϕ==4.2179kAx0min+x70.6049+0.2575
最小运行方式:
(Id3)min=7
6.33Eϕ==3.4326kAx0max+x70.8022+0.2575
8、综采设备库母线短路电流:
至综采设备库电缆为:
YJV226/6kV3×35460m,阻抗为:
x8=0.532+0.082×0.46=0.2466Ω
最大运行方式:
(Id3)max=8
6.33Eϕ==4.2719kAx0min+x80.6049+0.2466
最小运行方式:
(Id3)min=8
6.33Eϕ==3.4683kAx0max+x80.8022+0.2466
8
9、中央变电所各支路末端短路电流计算:
(1)至二采区变电所电缆为:
MYJV226/6kV3×951210m,阻抗为:
x11=0.192+0.082×1.21=0.2495Ω
最大运行方式:
(Id3)max=11
x0min
6.33Eϕ==3.6525kA+x1+x110.6049+0.1415+0.2495
最小运行方式:
(Id3)min=11
x0max
6.33Eϕ==3.4683kA+x1+x110.8022+0.1415+0.2495
(2)机头硐室变电所:
至机头硐室变电所电缆为MYJV226/6kV3×35500m,阻抗为:
x12=0.532+0.082×0.5=0.268Ω
最大运行方式:
(Id3)max=12
x0min
6.33Eϕ==3.5859kA+x1+x120.6049+0.1415+0.268
最小运行方式:
(Id3)min=12
x0max
6.33Eϕ==3.002kA+x1+x120.8022+0.1415+0.268
(3)南翼变电所:
至南翼变电所电缆为MYJV226/6kV3×50950m,阻抗为:
x12=0.372+0.082×0.95=0.3597Ω
最大运行方式:
(Id3)max=13
x0min
6.33Eϕ==3.2886kA+x1+x130.6049+0.1415+0.3597
最小运行方式:
9
(Id3)min=13
x0max
6.33Eϕ==2.7908kA+x1+x130.8022+0.1415+0.3597
第二节动、热稳定性校验
一、校验开关柜动热稳定性:
1、35kV变电所35kV室KYN10-40.5型开关柜
(3最大运行方式下35kV母线侧短路电流为:
IdC)max=1.786kA
冲击电流峰值项目动稳定热稳定
ikr=2.55Id=4.55kA
实际需要值4.55kA1.786kA50kA20kA
额定值
(开关柜资料已知量)
从表中可以看出实际需要值都小于额定值,开关柜满足动、热稳定型要求。
由于此开关柜为同一类型开关柜,故都满足动、热稳定性要求。
2、35kV变电所6kV室KYN28A-12型开关柜
(3最大运行方式下6kV母线侧短路电流为:
IdC)max=5.7277kA
冲击电流峰值项目动稳定热稳定
ikr=2.55Id=14.6kA
实际需要值14.6kA5.73kA80kA
额定值
(开关柜资料已知量)
31.5kA
从表中可以看出实际需要值都小于额定值,开关柜满足动、热稳定型要求。
由于此开关柜为同一类型开关柜,故都满足动、热稳定性要求。
3、压风机房、扇风机房、锅炉房变电所、主、副井绞车房开关柜型
10
号同35kV变电所6kV开关柜,因压风机房变电所为35kV变电所6kV馈出线路,其最大方式下三相短路电流及其冲击电流都小于35kV变电所6kV室,故也能满足要求。
5、井下中央变电所开关柜型号KYGC-Z,最大运行方式下6kV母
(3线侧短路电流为:
IdC)max=4.8734kA
冲击电流峰值项目动稳定热稳定
ikr=2.55Id=12.42kA
实际需要值12.42kA4.8734kA
额定值
(开关柜资料已知量)
31.5kA12.5kA
从表中可以看出实际需要值都小于额定值,开关柜满足动、热稳定型要求。
由于此开关柜为同一类型开关柜,故都满足动、热稳定性要求。
6、采区变电所高防开关动、热稳定性校验:
采区变电所用PJG9L-□/6Y型、PBG-
□/6Y型、PGJ-□/6Y型开关柜,三种型号的高防开关额定动稳定电流和额定热稳定电流相等,只需校验最大短路电流处高防开关即可,通过短路计算可知,二采变电所母线短路电流最大,其三相短路电流为:
Id(3)max=3.6525kA11冲击电流峰值项目动稳定热稳定
ikr=2.55Id=9.31kA
实际需要值9.31kA3.653kA
额定值
(开关柜资料已知量)
31.5kA12.5kA
从表中可以看出实际需要值都小于额定值,故井下高防开关都满足
11
动、热稳定型要求。
二、校验电缆热稳定下井高压电缆热稳定性校验已知下井电缆为交联聚氯乙烯铜芯钢丝铠装电力电缆MYJV42-6/6
(型,3×2401250m,此线路短路稳态电流为Iα3)=4.8734kA,铜芯聚
乙烯电缆的热稳定系数为C=230,短路发热假想时间为:
tima=top+toc+0.05=4.15s最小允许电缆截面为:
(Amin=Iα3)
timaC
=4.8734×
4.15=58.1mm2171
所选电缆A=240mm2,满足热稳定性要求。
式中:
Amin-短路时电缆最小热稳定截面,mm;Id-三相短路电流稳定值kA;tima-短路电流假想时间,取开关跳闸时间;C-电缆的热稳定系数,查手册取C=171。
⑴压风机房高压电缆热稳定校验
(电缆型号:
YJY22-6/6,3×35mm2,350m,Iα3)=4.5899kA
2
tima=1.15s,取C=171
(Amin=Iα3)
timaC
=4.5899×
1.15=28.8mm2171
所选电缆A=35mm2,满足热稳定性要求。
⑵副井绞车房高压电缆热稳定校验
(电缆型号:
YJY22-6/6,3×50mm2,270m,Iα3)=5.1443kA
tima=2.05s,取C=171
12
(Amin=Iα3)
timaC
=5.1443×
2.05=43.1mm2171
所选电缆A=50mm2,满足热稳定性要求。
⑶主井绞车房高压电缆热稳定校验
(电缆型号:
YJY22-6/6,3×50mm2,300m,Iα3)=5.0627kA
tima=2.05s,取C=171
(Amin=Iα3)
timaC
=5.0627×
2.05=42.4mm2171
所选电缆A=50mm2,满足热稳定性要求。
⑷通风机房高压电缆热稳定校验
(电缆型号:
YJY22-6/6,3×35mm2,290m,Iα3)=4.7837kA
tima=1.15s,取C=171
(Amin=Iα3)
timaC
=4.7837×
1.15=30mm2171
所选电缆A=35mm2,满足热稳定性要求。
⑸锅炉房变电所高压电缆热稳定校验
(电缆型号:
YJY22-6/6,3×35mm2,430m,Iα3)=4.3542kA
tima=1.15s,取C=171
(Amin=Iα3)
timaC
=4.3542×
1.15=27.3mm2171
所选电缆A=35mm2,满足热稳定性要求。
⑹洗煤厂高压电缆热稳定校验
(电缆型号:
YJY22-6/6,3×50mm2,680m,Iα3)=4.2179kA
tima=2.05s,取C=171
13
(Amin=Iα3)
timaC
=4.2179×
2.05=35.4mm2171
所选电缆A=50mm2,满足热稳定性要求。
⑺综采设备库高压电缆热稳定校验
(电缆型号:
YJY22-6/6,3×35mm2,450m,Iα3)=4.2719kA
tima=1.15s,取C=171
(Amin=Iα3)
timaC
=4.2719×
1.15=26.8mm2171
所选电缆A=35mm2,满足热稳定性要求。
⑻二采区变电所高压电缆
热稳定校验
(电缆型号:
MYJY22-6/6,3×95mm2,1210m,Iα3)=3.6525kA
tima=2s,取C=171
(Amin=Iα3)
timaC
=3.6525×
2=30.2mm2171
所选电缆A=95mm2,满足热稳定性要求。
⑼机头变电所高压电缆热稳定校验
(电缆型号:
MYJY22-6/6,3×35mm2,500m,Iα3)=3.5859kA
tima=2s,取C=171
(Amin=Iα3)
timaC
=3.5859×
2=29.7mm2171
所选电缆A=35mm2,满足热稳定性要求。
⑽南翼变电所高压电缆热稳定校验
(电缆型号:
MYJY22-6/6,3×50mm2,950m,Iα3)=3.2886kA
tima=2s,取C=171
14
(Amin=Iα3)
timaC
=3.2886×
2=27.2mm2171
所选电缆A=50mm2,满足热稳定性要求。
第三节扇风机房整定计算扇风机房整定计算
扇风机房1#、2#扇风机整定:
扇风机房、扇风机整定:
扇风机整定单级整定:
单级整定:
P=450KW,Ie=57.6A,nj=100/5,Kk=1.2−1.4短路整定Id=Kk*7*Ien=1.2*7*57.6100/5=24.2A
j
取24A取5.8A取3.2A
过流整定Idz=2*Ien=2*57.6100/5=5.76A
j
过载整定Izd=1.1*
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