印尼海德堡保护整定计算说明书Word文档格式.docx
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YJV-26/35kV2x3x(1x240),电缆长度为67m.
2#、3#主变高压侧电缆阻抗参数一样,长度分别为52m和56m。
2.4主变压器阻抗
主变型号为SFZ11-45000/33,40MVA(ONAN)/45MVA(ONAF),33±
8x1.25%/11kV,Dyn11阻抗为:
Ud%=10.5%
2.5主变电压电缆阻抗
1#主变低压电缆型号为:
YJV-8.7/15kV,4x3x(1x400),长度40m.
2#、3#主变高压侧电缆阻抗参数一样,长度分别为26m和56m。
2.6N-0535-MAINSUBSTATION至下级变电站电缆阻抗
2.6.1N-0535-MAINSUBSTATION至N-3030-Substation
电缆型号为:
YJV-8.7/15kV2x(3x185),长度:
350m
2.6.2N-0535-MAINSUBSTATION至N-4022-Substation
YJV-8.7/15kV1x(3x185),长度:
420m
2.6.3N-0535-MAINSUBSTATION至N-4031-Substation
YJV-8.7/15kV2x(3x120),长度:
510m
2.6.4N-0535-MAINSUBSTATION至N-5051-Substation
YJV-8.7/15kV3x95,长度:
90m
2.6.5N-0535-MAINSUBSTATION至N-0661-Substation
YJV-8.7/15kV2x(3x95),长度:
250m
2.6.6N-0535-MAINSUBSTATION至N-5060-Substation
760m
2.6.7N-0535-MAINSUBSTATION至N-6020-Substation
YJV-8.7/15kV3x185,长度:
2.6.8N-0535-MAINSUBSTATION至N-2020-Substation
1100m
2.6.9N-0535-MAINSUBSTATION至N-3021-Substation
YJV-8.7/15kV3x150,长度:
2.6.10SUBSTATION中变压器电缆
以一个为例,其他类似。
N-3030-SubstationRAWMILLT.R.
YJV-8.7/15kV,3x95,长度50m
2.6.11SUBSTATION中电动机电缆
N-3030-SubstationRAWMILL
YJV-8.7/15kV,3x120,长度170m
3保护整定计算
wholesubstation11kVzerosequencecurrentTAB
Cabletype
3×
95
120
150
185
Cablelength
5509
1294
250
7650
A/kM
1
1.1
1.3
1.4
Sub-total
5.509
1.4234
0.325
10.71
sum
18A
3.135kV1#、2#INCOMING
3.1.1Basicparameters
PhaseCTratio
ZerosequenceCTratio
GapzerosequenceCTratio
Protectionrelaytype
1500/1
none
MICOMP143+P543
3.1.2Protectionconfigurationandcalculaterule
protectionconfiguretimelimitover-current,timedelayovercurrent,lowvoltageprotectionandopticaldifferentialprotection。
3.1.2.1联络线差动保护定值整定
灵敏启动值Is1
Accordingtoavoidthemaximumunbalancecurrentsettingundertheconditionofmaximumload:
按躲过最大负荷时最大不平衡电流整定。
最大不平衡电流计算公式为:
Ium1=Krel*(KapKccKer+∆m)*Imax
式中:
Krel---可靠系数,取1.5~2.0
Kap---为非周期分量系数,此处选1.0。
Kcc---为互感器同型系数,一般选1。
Ker---电流互感器的比误差,取0.1。
Imax:
最大负荷电流,按线路CT额定电流考虑。
∆m---由于电流互感器变比未完全匹配产生的误差,初设时取0.05。
Iunb.1=Krel*(KapKccKer+∆m)*Imax=1.5*(0.1+0.05)*In=0.225In,
考虑1.5的可靠系数,Is2=1.5*Iunb.1=1.5*0.225In=0.3375,settingforIs1=0.4In
拐点制动电流整定值Is2
按以下原理整定:
1.最大运行方式下的最大负荷。
2.保证基本无CT暂态误差的最大电流。
进线CT等级为5P20,电流在20In以内误差在5%以内,综合考虑按2In整定,设置Is2=2In
斜率K1:
在拐点制动电流下差动保护动作电流为:
Id1=Krel*(KapKccKer+∆m)*Is2=1.5*0.15*2In=0.45In
按上图计算公式为:
K1=(Id1-Is1)/Is2=(0.45-0.4)/2=0.25,按0.3整定。
斜率K2:
Accordingtoavoidthemaximumunbalancecurrentsettingundertheconditionofmaximumoutsideshortcircuit:
按躲过外部最大故障电流时最大不平衡电流整定。
Ium2=Krel*(KapKccKer+∆m)*Ik.max
外部短路最大短路电流如下:
Iunb.2=Krel*(KapKccKer+Δm)*Ik/1.5=1.5*(0.1+0.05)*27/1.5=4.05In,考虑1.5可靠系数,
在最大外部短路电流下差动保护动作电流为:
Id2==1.5*4.05In=6.07In
K2=(Id2-Id1)/(Iunb.2-Is2)=(6.07-0.45)/(27/1.5-2)=0.35,按0.5整定。
HighSet
应与上面Id2值(6.07In)接近,设置6In。
在P543保护装置中具体整定清单为:
Currentdiff?
Yes
Is10.3In
Is22In
K130%
K250%
phasecharDT
phasetimedelay0s
IdiffCurveIECSI
phaseTMS1
phaseTimeDial1
PITIDisable?
No
DITTime0.1s
HighSet6In
3.1.2.2Timelimitover-current
进线在最大运行方式下电缆末端3相短路的最大电流如下。
进线在最大运行方式下电缆末端3相短路的最大电流为23.4kA.取灵敏系数为1.2,则电流速断保护整定值为1.2*23.4=28kA.
手动验证计算如下(标幺值):
系统最大阻抗为:
Zs.max=100/1806=0.05537
进线电缆阻抗为:
Zcab=
/10.89=0.0128
总阻抗为:
Zm=Zs.max+2*Zcab=0.081
短路电流为:
Ik=(1/Zm)*1.75=21.6kA,由于软件设置了一个助增系数为1.1,见下图:
所以软件计算出短路电流为21.6kA*1.1=23.7kA,与软件仿真结果基本一致,所以以下不再手动计算短路电流,以软件计算为准。
进线在最小运行方式下电缆首端的15%三相短路的短路电流如下。
进线在最小运行方式下电缆首端的15%三相短路的短路电流17.5kA,两相短路电流为0.866*17.5=15kA,小于28kA,故电流速断的有效保护范围<
15%,应改用电流闭锁电压速断保护。
电流闭锁电压速断按正常运行时电缆的75%处三相短路电流来整定,正常运行最小运行方式考虑,仿真计算如下.
流经电缆故障电流为16.55kA,母线电压为8.28%。
所以速断保护整定为:
17kA,闭锁电压整定为0.5Un(>
0.0828Un),考虑到主变高压母线及电缆故障引起扩大故障,速断保护延时0.2s动作跳闸。
timedelaydirectionovercurrent:
Accordingtothemaximumloadcurrent,duetoasinglelinecanberunwiththreemaintransformerload,accordingtotwicetheratedcurrentsetting,actiontimecooperatewiththesuperiorover-currentprotection,andconsiderdirectionlockout,directiontowardline.
calculate:
2×
In=2*1500A=3kA,delaytime0.5s。
灵敏度校验:
按过流保护按线路末端两相短路来校验,在最小运行方式下,线路末端两相短路时,其
0.866*16.17=14kA.
保护灵敏度为:
14/3=4.66,完全满足要求。
lowvoltageprotection:
Accordingtothemaximumoperatingmodethethree-phaseshort-circuitatthelowvoltagesideofmaintransformer,highvoltagesidebusbarvoltagevaluetocalculate,consider1.3safetyfactor,actiontime0.5s。
76%/1.3=58%Un,settingfor0.55Un。
3.1.3Summaryprotectionsetting
Timelimitover-current
Timerelaydirectionover-current
Lowvoltage
17kA/0.5Un/0.2s
3kA/0.5s
0.55Un/0.5s
3.235kV1#、2#、3#TRANSFORMER
3.2.1Basicparameters
Transformercapacity(KVA)
Transformershort-circuitimpedance
Thetransformerratedcurrent(primary)
GapZerosequenceCTratio
Protectiontype
45000
10.5%
787A
100/1
33/1
MICOMP632+P143
3.2.2Protectionconfigurationandcalculaterule
ProtectionconfigureCompoundvoltageovercurrentprotection(includinglowvoltageandnegativesequencevoltagesetting),overloadprotection,differentialprotection(includingthepercentagedifferentialpickupvalue,sloperatio,basepointandUnrestraineddifferentialprotection)andzero-sequencedifferentialprotection
Compoundvoltagelockoutovercurrentprotection
Consideringprotectioncooperaterelationship,compoundvoltageovercurrentprotection,inordertoimprovetheprotectionsensitivity,actionvalueaccordingtomaximumloadcurrentsetting,consider1.1timesofratedcurrent,calculate:
1.1*45000/1.732/787=787A(primaryvalue),0.9stripbuscoupler,1.1striplowvoltagesideofthebreaker.
Lowvoltagesetting
Undermaintransformerlowvoltagesideofminimumoperationmode,thebusvoltageis23.98KV,consider0.9safetyfactor,thecalculationfor:
23.98/0.9/33=0.8,accordingto0.7Unsetting.
Negativesequencevoltagesetting
Accordingtoavoidthebiggestnegativesequencevoltageundertheunbalancedloadsetting。
Normalrunningnegativesequencevoltageisnotmorethan2%ofratedvoltage,generallythewhole6v。
Overloadprotection
Overload,inaccordancewith1.05timesratedcurrenttransformersetting,actiontime9s,alarm.
ratiodifferentprotectionpickupvalue
Accordingtoavoidflowthemaximumunbalancecurrentsettingundertheconditionofmaximumload:
Iunb.max=Krel*(Ker+ΔU+Δm)*Ie=1.5*(0.06+0.1+0.05)*Ie=0.112Ie,Generallysettingfor0.2ratio。
Thedifferentialprotectionrestraintsloperatio:
Largestbusbarthree-phaseshort-circuitcurrent6.86kA,producedbytheunbalancecurrentIunb.max=(Kap*Kcc*Ker+ΔU+Δm)*Ik(3)
=(2*0.5*0.1+0.05+0.05)*6.86kA=686A/787A=0.87Ie,Thedifferentialprotectionoperatingcurrentis:
Krel*Iunb.max=1.5*0.87Ie=1.3Ie,sloperatio:
(1.3-0.2)/(6860/787-1)=0.14,generalsettingfor0.3.
differentprotectionbasepoint:
basepointaccordingtomaxloadcurrentcalculate,generalsettingfor1.5theratedcurrent。
Unrestraineddifferentprotection:
Accordingtotheminimumoperationmode,maintransformerlowvoltagesidetwophaseshortcircuitcurrentsettingcalculation,reliablecoefficientof1.3,then4700*0.866/1.3=3130A=4.0Ie.
Zero-sequencedifferentialprotection
Accordingtoavoidtheexternalunbalancecurrentofsingle-phasegroundingfaultsetting:
Iop=Krel*(fi+Δm)*Ik(3)=1.5*(0.1+0.05)*6860/787=0.29Ie,settingfor0.3Ie,sloperatio0.5,basepoint:
1Ie,Unrestraineddifferentprotection:
4Ie.
3.2.31.2.3.Summaryprotectionsetting
Timerelayover-currentwithcompoundvoltagelockout
Overload
Differentpickup
Sloperate
Basepoint
Unrestraineddifferentprotection
866A/0.7Un/6V/0.5s
1.05Ie,9s,signal
0.2In
0.3
1.5In
7In
Pickupvalue:
0.3Ie,sloperatio:
0.5,basepoint:
1Ie,Unrestraineddifferentprotection:
4Ie
3.335kV1#、2#COUPLING
3.3.1baseparameters
MICOMP143
3.3.2Protectionconfigurationandcalculaterule
protectionconfiguration:
Chargingprotection,overcurrentprotection
Chargingprotection
Accordingtothetwophaseshortcircuitcurrentcalculationunderminimalbusbaroperationmode,reliablecoefficientof1.3,1sexitaftercharging,settingcalculationis:
15.14/1.3=11.64kA,settingfor11KA
Overcurrentprotection
Theover-currentprotectionisbackupfortransformerdifferentialprotectionafterchargingoverandaccordingtothetwophaseshort