瓦斯保護微課WKEGasProtection知

識

點：瓦斯保護原理專 業(yè)：電力類相關專業(yè)單 元：變壓器保護Knowledgepoint:GasprotectionprincipleMajor:Electricpowerrelated

majorsUnit:Transformer

protection瓦斯保護

Gas

Protection變壓器的瓦斯保護用來反應油浸式變壓器油箱內的各種故障。當變壓器油箱內故障時，瓦斯保護有著獨特的、其它保護所不具備的優(yōu)點，如當變壓器發(fā)生嚴重漏油、繞組斷線故障或繞組匝間短路產(chǎn)生的短路電流值不足以使其它保護動作時，只有瓦斯保護能夠靈敏動作發(fā)出信號或跳閘。Thegasprotectionofthetransformerisusedtorespondtovariousfaultsintheoil-immersedtransformertank.Whenthereisafaultinthetransformertank,gasprotectionhasuniqueadvantagesthatotherprotectionsdonothave.Forexample,whenthereisaseriousoilleakageinthetransformer,awindingdisconnectionfault,orashortcircuitbetweenwindingturns,theshortcircuitcurrentvalueisnotenoughforotherprotectionstooperate,andonlythegasprotectioncanrespondsensitivelytosendasignalor

trip.所以變壓器的瓦斯保護是大型變壓器內部故障的重要保護Therefore,thegasprotection

oftransformersisanimportantprotectionforinternalfaultsoflarge

transformers.01瓦斯繼電器Gasrelay02瓦斯繼電器的整定Settingofgas

relay03輕瓦斯發(fā)信后的處理Processingaftersendinglightgas

signal瓦斯繼電器Gas

relay01/

ONE瓦斯繼電器Gas

relay瓦斯繼電器是實現(xiàn)瓦斯保護的主要元件。Gasrelayisthemaincomponentforgas

protection.圖1A：法蘭盤連接的殼體Figure1A:Housingwith

flangeconnection圖1B：螺紋連接的殼體Figure1B:Threaded

housing瓦斯繼電器Gas

relay瓦斯繼電器安裝在變壓器油箱與油枕之間的連接管道中。Thegasrelayisinstalledintheconnectingpipebetweenthetransformertankandtheoil

conservator瓦斯繼電器Gas

relay瓦斯保護Gas

protection分為Fall

into輕瓦斯保護Lightgas

protection重瓦斯保護Heavygas

protection在我國電力系統(tǒng)中應用的瓦斯繼電器大多是開口杯擋板式結構。MostofthegasrelaysusedinChina'spowersystemsareopencupbafflestructures.瓦斯繼電器的整定Settingofgas

relay02/

TWO瓦斯繼電器的整定250cm3～300cm3>>>Settingofgas

relay01.

輕瓦斯保護整定Settingoflightgas

protection動作值：采用氣體容積大小表示Operationvalue:expressedbygas

volume整定范圍通常為Thesetting

rangeis

usually調整方法：通過移動重錘的位置，調整動作值。Adjustmentmethod:Adjusttheoperationvaluebymovingthepositionofthe

weight.瓦斯繼電器的整定調整方法：通過調整調節(jié)螺桿，改變彈簧的松緊程度，調整重瓦斯的動作值。Adjustmentmethod:Byadjustingthescrew,changethetightnessofthespringandadjusttheoperationvalueofthe

heavygas.0.6～1.5m／s>>>Settingofgas

relay02.

重瓦斯保護整定Settingofheavygas

protection動作值：采用油流速度大小表示Operationvalue:Expressedbyoilflow

velocity整定范圍通常為Thesetting

rangeis

usually瓦斯繼電器的整定Settingofheavygas

protection瓦斯保護的接線Gasprotection

wiring當變壓器內部發(fā)生輕微故障時，輕瓦斯保護動作，瓦斯繼電器KG的上觸點（KG1）閉合，作用于預告信號Whenaminorfaultoccursinsidethetransformer,the

lightgasprotectionoperates,andtheuppercontact(KG1)ofthegasrelayKGcloses,operatingonthewarning

signal當發(fā)生嚴重故障時，重瓦斯保護動作，下觸點（KG2）閉合，經(jīng)信號繼電器KS作用于中間繼電器KCO，發(fā)出報警信號，同時將斷路器跳閘。Whenaseriousfaultoccurs,theheavygasprotectionoperates,thelowercontact(KG2)isclosed,andthesignalrelayKSoperatesontheintermediaterelayKCO,sendinganalarmsignalandtrippingthecircuitbreakeratthesame

time.輕瓦斯發(fā)信后的處理TreatmentofLightGasafterLetter

Delivery03/

THREE輕瓦斯發(fā)信后的處理TreatmentofLightGasafterLetter

Delivery輕瓦斯發(fā)信時，值班人員必須立即檢查動作原因Whenalightgassignalissent,thepersonondutymustimmediatelycheckthereasonforthe

operation01空氣侵入變壓器內（檢查油系統(tǒng)嚴密性）Airintrudesintothe

transformer(checkthetightnessofthe

oilsystem)02滲漏油或其它原因使油位降低Oilleakageorother

reasonslowertheoil

level03瓦斯繼電器本身故障Theself-failureofgas

relay04二次回路故障引起瓦斯誤發(fā)信號Secondarycircuit

failurecausesfalsegas

signal輕瓦斯發(fā)信后的處理TreatmentofLightGasafterLetter

Delivery瓦斯繼電器動作后，要立即收集瓦斯繼電器內聚積的氣體，通過鑒別氣體的性質，做進一步判斷。Afterthegasrelayoperates,thegasaccumulatedinthegasrelayshouldbecollectedimmediately,andfurtherjudgmentshouldbemadebyidentifyingthepropertyofthe

gas.瓦斯氣體的收集采用注射器法，同時取兩支樣品，一支作點燃試驗，另一支作色譜分折，不得在瓦斯繼電器放氣閥門處直接做點燃試驗。Usethesyringemethodtocollectgas.Taketwosamplesatthesametime,oneforignitiontestandtheotherforchromatographicanalysis.Donotperformignitiontestdirectlyatthegasrelayvent

valve.若瓦斯繼電器內的氣體為無色無臭味而不可燃，色譜分析判斷為空氣，則變壓器可繼續(xù)運行。Ifthegasinthegasrelayiscolorless,odorlessandnon-flammable,andisjudgedtobeairbychromatographicanalysis,thetransformercancontinueto

operate.若判別為變壓器內部故障引起，則按事故處理規(guī)程執(zhí)行。Ifitisdeterminedtobecausedbyaninternalfaultofthe

transformer,followtheaccidenthandling

procedures.輕瓦斯發(fā)信后的處理TreatmentofLightGasafterLetter

Delivery若瓦斯信號因油內剩余空氣排出而動作，值班人員應放出繼電器內的空氣，瓦斯繼電器放氣時，只能在瓦斯繼電器上部放氣閥進行，不得誤按重瓦斯動作試驗按鈕(探針)以防誤跳主變三側開關。Ifthegassignalisoperatedduetothedischargeofremainingairintheoil,thepersonondutyshouldreleasetheairintherelay.Whendeflatingthegasrelay,itcanonlybedonethroughthebleedvalveontheupperpartofthegasrelay.Donotpresstheheavygas

operation

test

button

(probe)

bymistake,

to

prevent

the

three-side

switch

ofthe

main

transformer

from

accidentally

tripping.放氣閥Bleed

valve探針

Probe輕瓦斯發(fā)信后的處理氣體性質

/Gas

property故障類型/Fault

type無色、無臭味、不可燃Colorless,odorless,

non-flammable空氣