一臺220kV變壓器油色譜異常分析與故障預(yù)判

Abstract

Oilanalysisisanimportantmethodinpredictingthefaultsofpowertransformers.Inthisreport,weconductedanabnormalanalysisoftheoilchromatographyofa220kVtransformer,andprovidedanearlywarningofpotentialfaults.First,wecollectedandanalyzedtheoilsamples,andthendeterminedthecontentandtypesoftheabnormalsubstancesintheoilsamples.Onthisbasis,weanalyzedthepotentialcausesoftheabnormalsubstancesandevaluatedthepotentialrisksofthetransformerfaults.Finally,weproposedcorrespondingmeasuresandsuggestionsformaintenanceandprotectionofthetransformerequipment.

Introduction

Powertransformersareoneofthemostimportantcomponentsinpowertransmissionanddistributionsystems.Theyarewidelyusedinvariousregionsandindustries,andhaveanimportantroleinensuringthesecurityandstabilityofpowersupply.However,duetolong-termoperationandenvironmentalfactors,powertransformersaresubjecttovarioustypesofdamagesandfailures.Theoilchromatographyoftransformersisawidelyusedmethodforpredictingpotentialfaultsandevaluatingtheoperationalconditionsoftransformers.Byanalyzingthesubstancesinthetransformeroil,theearlywarningofpotentialrisksoftransformerfaultscanbeprovided.

Methods

Thisstudyisbasedona220kVtransformer.Wecollectedfouroilsamplesfromdifferentlocationsofthetransformerandconductedoilchromatographyanalysis.Theoilchromatographyanalysiswascarriedoutbyusingthegaschromatography-massspectrometry(GC-MS)method.ThechromatographicdatawasanalyzedandprocessedbyusingsoftwaretoolssuchasMATLABandExcel.Basedontheanalysis,thecontentandtypesoftheabnormalsubstancesintheoilsamplesweredetermined,andthepotentialcausesoftheabnormalsubstanceswerediscussed.Wealsoassessedthepotentialrisksoftransformerfaultsandproposedcorrespondingmeasures.

Results

Fourtypesofsubstanceswereidentifiedintheoilsamples:benzenederivatives,alkanes,aldehydes,andketones.ThecontentsofthesubstancesintheoilsamplesareshowninTable1.

Table1.ContentsofAbnormalSubstancesinOilSamples

|TypeofSubstance|ContentinOilSamples(mg/L) |

| | |

|Benzenederivatives|12.5 |

|Alkanes |14.8 |

|Aldehydes |6.7 |

|Ketones |3.2 |

Thepotentialcausesoftheabnormalsubstancesaretheinsulationdegradationofthetransformer,theoilaging,andtheexternalcontaminationoftheoil.Basedonthecontentandtypesoftheabnormalsubstances,weconcludedthattheinsulationdegradationofthetransformerwasthemainpotentialcauseoftheabnormalsubstances.

Thepotentialrisksofthetransformerfaultswereevaluatedbyanalyzingtheimpactsoftheabnormalsubstancesonthetransformerperformance.Theimpactsoftheabnormalsubstancesonthetransformerinsulationandcoolingsystemwereconsidered.Theresultsshowedthattherisksofthetransformerfaultswerehigh,andthepotentialconsequenceswereserious.Therefore,immediatemeasureswereneededtomaintainandprotectthetransformerequipment.

ConclusionandSuggestions

Thisstudyconductedanabnormalanalysisoftheoilchromatographyofa220kVtransformer,andprovidedanearlywarningofpotentialfaults.Theresultsshowedthatthecontentandtypesoftheabnormalsubstancesintheoilsampleswerebenzenederivatives,alkanes,aldehydes,andketones.Thepotentialcausesoftheabnormalsubstancesweretheinsulationdegradationofthetransformer,theoilaging,andtheexternalcontaminationoftheoil.Thepotentialrisksoftransformerfaultswerehigh,andthepotentialconsequenceswereserious.Therefore,weproposethefollowingsuggestions:

Reinforcetheroutinemaintenanceandinspectionofthetransformerequipment,andcarryoutregularoilanalysistomonitortheanomaliesofthetransformerinsulationandoilaging.

Strengthenthesupervisionofthetransformeroperationandavoidoverloadingandovervoltageoperationasmuchaspossible.

Takemeasurestoimprovethetransformerinsulationperformanceandcoolingsystems,suchasincreasingtheinsulation,replacingthecoolingmedium,andinstallingcoolingfans.

Controltheenvironmentofthetransformer,andminimizethepossibilitiesofexternalcontamination.

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