发电机交流耐压试验作业指导书

Rev.DateCompiledbyReviewApprovalWorkInstructionforGeneratorHVWithstandTestDocumentNoKTPP-0-SEPS-COM-WI-4009PROJECT4x350MWKamalangaThermalPowerProjectOWNERGMR卡玛朗加能源有限公司GMRKAMALANGAENERGYLIMITEDOWNER’sENGINEER拉玛雅国际咨询有限公司LAHMEYERINTERNATIONAL(INDIA)PVT.LTD.CONSULTINGENGINEERS,GURGAONEPCCONTRACTOR山东电力基本建设总公司SEPCOELECTRICPOWERCONSTRUCTIONCORPORATIONSUBCONTRACTOR工程概况Briefintroductionoftheproject卡玛朗加火力发电厂由GMR能源有限公司在现场兴建，该位置位于印度奥里萨邦德赫克纳尔区。该项目为新建工程，包括四台机组，每台机组容量为350MW。本工程采用东方电机股份有限公司生产的三相发电机，额定功率350MW，功率因数0.85，端电压20kV，频率50Hz，转速为3000rpm。汽轮发电机采用水-氢-氢冷却方式。TheKamalangaThermalPowerStationwouldbesetupbyGMRkamalangaEnergyLimitedatasite,whichfallsundertheDhenkanaldistrictofOrissa,India.TheprojectisaGreenfieldprojectconsistingoffourunitseachof350MW.Thegeneratorsproposedfortheplantareofthreephase,manufacturedbyDFEM,withtheratedpowerof350MW,powerfactorof0.85lagging,terminalvoltageof20kV,frequencyof50Hzandspeedof3000rpm.Theturbinegeneratoradoptsthetypicalwater-hydrogen-hydrogencoolingsystem.编制依据Referencesofthecompilation下列文件中的条款通过本作业指导书的引用而成为本作业指导书的条款。Theprescriptionsinthedocumentslistedbelowareincludedinthisworkinstructionbyquotation.2.1）GB50150-2006电气设备交接试验标准；GB50150-2006Standardforhand-overtestofelectricequipment;2.2)DL5009.1-2002电力建设安全工作规程DL5009.1-2002Safetyworkregulationsofelectricpowerconstruction2.3）QFSN-300-2-20型汽轮发电机安装说明书QFSN-300-2-20Turbinegeneratorinstallationmanual试验项目及程序Testingitemsandprogress3.1）试验项目Testingitems）定子绕组的绝缘电阻、吸收比、极化指数测量。MeasurementofIR、Absorptance、Polarizationindexofstatorwinding.）定子绕组端部现包绝缘施加直流电压测量。DCHVtestofgeneratorstatorwindingoverhanghandmadeinsulation.）定子绕组直流耐压试验和泄漏电流测量。StatorwindingDCHVtestandmeasurementofleakagecurrent.）定子绕组交流耐压试验。ACHVtestofstatorwinding.3.2）试验程序Testprogram）试验开始之前详细记录试品的铭牌参数，检查、了解试品的状态，并进行记录。Recordtheparametersonnameplateindetailsbeforetest,inspecttheconditionofthematerialsbeingtested,andmakerecords.）按先低压试验后高压试验、先直流后交流的顺序进行试验。在绝缘电阻测量无异常后再进行耐压试验。交流耐压试验后重复测试绝缘电阻，以判断耐压试验前后试品的绝缘有无变化。TheLVtestshallbecarriedoutpriortoHVtest,andDCtestshallbecarriedoutbeforeACtest.Thewithstandvoltagetestshallbecarriedoutaftermeasuringtheinsultedresistance.TesttheinsultedresistanceagainafterACwithstandvoltagetest,soastoknowthedifferenceofinsulatedstatusoftestedpiecesbeforeandaftertest.4.施工准备Constructionpreparation4.1）水内冷发电机专用绝缘电阻测试仪、温度计、湿度计。SpecialIRtesterforwatercoolinggenerator、Thermometer、Hygrometer.4.2）直流高压发生装置。DChighvoltagegenerator.4.3）成套工频交流耐压装置。PowerfrequencyACwithstandvoltagedevice.）试验变压器高压侧额定电流In应大于试品所需电流Ix，其中Ix可按下式估算：Ix=2πfCxUx≈2.5A（f—试验电源频率50Hz，Cx—被试绕组对地等效电容0.225*10-6F，Ux—试验电压32800V）

Theratedcurrent

Inonhigh-voltagesideofthetesttransformer

shouldbegreaterthancurrentIxrequiredbythetestproduct

,

where

Ix

canbeestimatedasfollows:Ix=2πfCxUx≈2.5A

(f-test

powersupplyfrequency50Hz,Cx-trial

windingonequivalentcapacitanceof

0.225*10

-6

F

Ux-test

voltage

32800V)）试验变压器，容量可按下式计算：S＞2πfCxUx2＞80kVA（f—试验电源频率50Hz，Cx—被试绕组对地等效电容0.225*10-6F，Ux—试验电压32800V）Testtransformercapacitycanbecalculatedasfollows:

S>

2πfCxUx

2>

80kVA

(f-test

powersupplyfrequencyof

50Hz,Cx-trial

windingtogroundtheequivalentcapacitanceof0.225*10

-6

Fthe

Ux-test

voltage

32800V

)）调压器，容量与试验变压器匹配。Regulator,capacitymatchwiththetesttransformer.5．施工工艺流程Constructionprocess5.1）定子绕组的绝缘电阻、吸收比、极化指数测量。MeasurementofIR、Absorptance、Polarizationindexofstatorwinding.）测量并记录环境温度和湿度。

Measureandrecordtheambienttemperatureandhumidity.）将汇水管用导线引至试验场地，把汇水管所有引下线拧在一起，用万用表测量汇水管对地电阻，应大于30kΩ。将汇水管引线接至专用兆欧表的屏蔽端子上。Leadingthecoolingwaterpipebywiretothetestsite,allofdeflectorsofcoolingwaterpipescrewedtogether;measurecoolingwaterpiperesistancetogroundwiththemultimeter,whichshouldbegreaterthan

30kΩ.

Leadingcoolingwaterpipeconductorstotheshieldterminalondedicatedmegger.）分相测量，每相绕组必须头尾短接，并将非被试绕组、转子绕组接地。Takesub-phasemeasurements,eachphasewindingmustbeheadtotailbyshortjointandgroundthewindingnottobetestedandrotorwinding.）将地线端子用接地线和发电机外壳连接好，用绝缘把手将测试线接触到被测量绕组的引出端头上，开始测量，记录15s、60s、600s的绝缘电阻值。Theearthterminalshallbeconnectedwiththegroundlineandthegeneratorcasing,useinsulatinghandletocontactthetestlinetotheleadingendoftheheadofthemeasuringwinding,startthemeasurement,recording

15s,60s,600s,

insulationresistancevalue.）各相绝缘电阻的不平衡系数≤2（不平衡系数=最大值/最小值）。Theunbalancefactorofinsulationresistanceofeachphase

≤2the

(unbalancedcoefficient

=

max

/

min).）吸收比≥1.6，极化指数≥2。Absorptionratio

≥

1.6,

polarizationindex

≥

2.5.2）定子绕组端部现包绝缘施加直流电压测量。DCHVtestofgeneratorstatorwindingoverhanghandmadeinsulation.）用铝箔将引线接头现场包绝缘部位包裹严实。

Wrapthepackageinsulationpartsoftheleadingwirejointsatsitebyaluminumfoiltightly.）发电机三相绕组加直流电压至20kV，用100MΩ电阻杆串微安表逐点测试包铝箔的部位，同时记录微安表的读数。

Generatorthree-phasewindingsplustheDCvoltageto

20kV,

testpartsofaluminumfoilpointbypointwiththethe

100MΩ

resistorrodstringmicroammete,whilerecordingmicroammeterreadings.）根据U=IR，计算表面电位（U—表面电位，I—微安表的读数，R—100MΩ）。Calculatedaccordingto

U=

IR,

thesurfacepotential

(U-surface

potential,

I-microammeter

readings,

the

R-100MΩ).）要求各点电压≤1900V。

Voltage

ofeachpoint≤

1900V.5.3）定子绕组直流耐压试验和泄漏电流测量。StatorwindingDCHVtestandmeasurementofleakagecurrent.）试验电压为电机额定电压的3倍（60kV）。转子绕组在滑环处接地。发电机出口电流互感器二次绕组短路接地。埋置测温元件在接线端子处电气连接后接地。Thetestvoltageis

3

timestheratedmotorvoltage

(60kV).

Rotorwindinggetgroundedatsliprings.

Exportofgeneratorcurrenttransformersecondarywindingisshortedtoground.

Embeddedtemperaturemeasurementdevicesgetelectricalconnectedattheterminalsbeforegetgrounding.5.3.2)分相测量，每相绕组必须头尾短接，并将非被试绕组、转子绕组接地。Takesub-phasemeasurements,eachphasewindingmustbeheadtotailbyshortjointandgroundthewindingnottobetestedandrotorwinding.5.3.3）试验电压按每级0.5倍额定电压分阶段升高，每阶段停留1min，并记录泄露电流；在规定的试验电压下，泄露电流应符合下列规定：（1）各相泄露电流的差别不应大于最小值的100%，当最大泄露电流在20μA以下，根据绝缘电阻值和交流耐压试验结果综合判断为良好时，各相间差值可不考虑；（2）泄露电流不应随时间延长而增大；（3）泄露电流随电压不成比例地显著增长时，应及时分析。Perlevelofthetestvoltageis

0.5

timestheratedvoltageinphaseselevated,eachstagestay

1min,

andrecordtheleakagecurrent;underspecifiedtestvoltage,leakagecurrentshouldmeetthefollowingrequirements:

(1)

theleakagecurrentofeachphaseofthe

100%ofthe

differenceshouldnotbegreaterthantheminimum,maximumleakagecurrentof20μA

orless,accordingtothevalueofinsulationresistanceandACvoltagetestresultstodetermineagoodall-whitedifferencemaynotbeconsidered;

(2)

leakagecurrentshouldnotbewiththetimeincreases;

(3)

withvoltagedisproportionatelysignificantincreaseinleakagecurrent,timelyanalysis.5.3.4）氢冷电机必须在充氢前或排氢后且含氢量在3%以下时进行试验，严禁在置换氢气过程中进行试验。Hydrogen-cooledmotorbeforehydrogenchargingorrowofhydrogenandhydrogencontentbelow

3%

test,totesttheprocessofreplacementofhydrogenisstrictlyprohibited.5.3.5）水内冷电机宜采用低压屏蔽法（见图1）。

Watercooledgeneratorshouldadoptthelow-pressuremethodofshielding(seeFigure1).5.4）定子绕组交流耐压试验。ACHVtestofstatorwinding.）试验电压为(1000+2Un)*0.8=32.8kV。水内冷电机在通水情况下进行交流耐压试验，水质应合格；氢冷电机必须在充氢前或排氢后且含氢量在3%以下时进行试验，严禁在置换氢气过程中进行试验。Testvoltage

(1000+2Un)*0.8=

32.8kV.

ACvoltagetestwatercooledmotorthroughthewater,thewaterqualityshouldbequalified;hydrogen-cooledmotorbeforehydrogenchargingorrowofhydrogenandhydrogencontentof

lessthan

3%

test,isstrictlyprohibitedintheprocessofreplacementofhydrogentrials.）试验前先进行绝缘电阻和吸收比、直流泄漏等试验，各项试验合格后再进行本项试验。试验后再进行一次绝缘电阻和吸收比测量，比较试验前后的变化。Beforetestinsulationresistanceandabsorptionratio,DCleakagetest,thenthetestqualifiedforthetrials.

Thetestchangeintheinsulationresistanceandabsorptionmeasuring,comparingthebeforeandaftertest.）转子绕组在滑环处接地。发电机出口电流互感器二次绕组短路接地。埋置测温元件在接线端子处电气连接后接地。水内冷发电机汇水管接地。检查试验电源、调压器和试验变压器正常。分相测量，每相绕组必须头尾短接，并将非被试绕组接地。按接线图接线，保证所有实验设备、仪器仪表接线正确、指示正确（见图2）。Rotorwindingslipringsatground.

Generatortheexportcurrenttransformersecondarywindingisshortedtoground.

Embeddedtemperaturemeasurementdevicesinthewiringterminalselectricalconnectiontoground.

Watercooledgeneratorsinkwaterpipeground.

Checktestnormalpowerregulatorandtesttransformer.Takesub-phasemeasurements,eachphasewindingmustbeheadtotailbyshortjointandgroundthewindingnottobetested.Wiringdiagramtoensurethatalllaboratoryequipment,instrumentationwiringiscorrect,correctinstructions.(seeFigure2)5.4.4）一切设备仪表接好后，在空载条件下调整保护间隙，其放电电压在试验电压的110%-120%的范围内。Allconnectedequipment,instrumentation,underno-loadconditionstoadjusttheprotectiongap,thedischargevoltageintherangeof

110%-120%

ofthetestvoltage.）升压必须从零开始，升压速度在40%试验电压以内可不受限制，其后应均匀升压，速度约每秒3%的试验电压。升至试验电压后维持1min。Boostmuststartfromscratch,boostspeedinlessthan

40%ofthe

testvoltagecanbeunrestricted,subsequentlyshouldbeuniformboostspeedofabout

3%

persecondofthetestvoltage.

Roseafterthetestvoltagetomaintain

1min.）将电压降至零，拉开电源，该绕组试验结束。Thevoltagedropstozero,pullpowersupply,thewindingendofthetrial.6.施工注意事项Constructionnotices6.1）试验前，充分了解被试设备的厂家说明书及本措施，严格按照本措施施工。Beforetesting,tofullyunderstandthemanufacturer'sinstructions,andthemeasuresoftestequipment,constructioninstrictaccordancewiththemeasures.6.2）试验前对所有参加试验人员进行详细的安全、技术交底。

Alltoparticipateinthetrialpersonneldetailedsafetyandtechnicaltestsbeforethetest.6.3）试验时正确使用仪器、仪表，避免人为损坏仪器、仪表。Testtheproperuseofinstruments,meters,instruments,meterstoavoidman-madedamage.6.4）试验过程中及时正确地做好记录。Duringthetestinatimelymannertherighttomakearecord.6.5）验设备周围设围栏，并有专人监护，发电机出线侧和中性点侧应派专人把守，防止无关人员误入。Therequestmustsetupafencearoundthetestequipment,andtosupervisethegeneratoroutletsideandtheneutralsideshouldsendsomeoneguardedtopreventunrelatedpersonnelstrayed.

6.6）试验用电源开关要悬挂“试验专用，严禁乱动”警示牌。Thewarningcardwhichissaying“Specialforuse,donotfiddlewithit”fromthepowerswitchusedfortest6.6)发电机试验应有厂方人员现场技术指导。Thetestingofgeneratorshouldbeguidedbytheengineerofmanufacturer.7．安全和环保注意事项Safetyandenvironmentalprotectionnotices7.1）为保证人身和设备安全