考虑励磁涌流的保护整定。pdf格式文献。 南昌大学 李圣涛 上传
现代电子技术
ModernElectronicsTechnique
Jul.2011
Vol。34No.14
第34卷第14期
考虑变压器励磁涌流影响的保护整定
范
瑾
(西安邮电学院,陕西西安710061)
摘要:在大型变压器空栽冲击过程中,由于励磁涌流和负序电压的存在,如果定值整定不得当,会导致差动保护,复压过流保护等误动作,影响设备的正常运行。为了保证定值整定的正确性,在此通过对励磁涌流产生的原因和特点进行理论分析,结合变压器冲击过程中实际数据以厦大型变压器冲击过程中由于定值整定不舍理造成保护误动作的实例,对变压器冲击过程中相关定值整定的原则进行了探讨。在定值的整定过程中要考虑励磁涌流的幅值、谐波含量和衰减时间以及负序电压的幅值和衰减时间的影响。
关键词:励磁涌流;复压过流保护;定值整定;差动保护;变压器冲击中图分类号:TN911—34;TM773
文献标识码:A
文章编号:1004—373X(2011)14—0191—04
ProtectionSettingValueCalculationConsideringInfluenceof
FANJin
TransformerExcitationInrushCurrent
(xi’anInstituteofPostsandTelecommunuications.Xi’an7100761。China)
Abstract:Inno-load
cause
impact
process
oflargetransformers,theexcitationinrush
pressure
current
andnegative
sequence
voltage
can
protectionmisoperationofdifferentialprotectionandcomplex
not
over-current
protectionifthesettingvaluecalcu—
protec—
lationis
reasonable.Inorder
tOensure
the
correctness
ofprotectionsettingvaluecalculation,theprincipleofthe
causes
tionsettingvaluecalculationisdiscussed
on
thebasisofthetheoreticalanalysisof
andcharacteristicsoftheexcitation
inrushcurrent,andineombiniationwiththeactualdataduringtransformerimpactandunreasonableprotectionsettingvaluecalculationinlargeculated,theattenuation
examplesofmisoperationcausedbythe
transformerimpactprocess.Whentheprotectionsettingvalueiscal—
as
amplitude,harmonictimeofnegative
content
andattenuationtimemustbeconsidered,aswelltheinfluenceofamplitudeand
sequencevoltage.
pressureover-current
Keywords:excitationinrush
ferentialprotection
transformer
current;compleximpact
protection
protectionsettingvaluecalculation;dif—
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