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HVDCTester
ShanghaiDielecElectrotechnicsCo.,Ltd
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!SafetyWarning
zTheoperatoroftheHVDCtestershallbeaprofessionalwhohasgotthecertificate
forHVtests.
zBeforetheworkingpowerstarts,twoobviousoffpointsshallbeadded.When
replacingtestedobjectorconnectingwire,thetwooffpointsshallbecutoff.
zBeforetest,pleasecheckallwiring.Thetestloopshallbegroundedwithonepoint
astomanual.
zForbiggercapacitanceobject,thedischargeshallbewith100ohm/vdischarge
resistancerod.Therodshallbenearthetestedobjectslowly.Pleasenotethat
whenzznoiseisover,startthedischarge.Finally,connecttheearthlineandstart
discharge.
zTheuseroftheinstrumentshouldcomplywiththesafetyrulesfromNationalor
localgovernmentanditisrecommendedtosettwoevidentcut-offpointonthe
powersupplylinewhichenterthetester.
zTheoperatormustnottouchotherperson’sbodyduringHVtest,whoisbeinga
certainpotentialDCvoltagecondition,inordertoavoidthedischargebetweenthe
twobodieseachother.
zAftertest,thegroundingwireshallhangtoHVoutputandthendismantleHV
conductwire.
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1.Introduction
DHVseriesTesterissuitabletocarryoutHVDCtestforarrestor,powercable,
generator,transformer,switchgear…etc.inthepowerdepartmentofutilitiesand
enterprises.
2.Blockdiagramofoperationprinciple
Input→
~230V
Rectifier
Filter
→
PWM
Power
switch
→
MOS
Bridge
Inverse
Trans.
→
Medium
Freq
HVTrans-
former
→
Voltage
multiply
Rectifier
→
HVCurrent
limited
resistance
→
HVDC
Output
↑↑↓↓
Impulse
Width
Modulation
and
control
circuit
←Protective
Circuit
←
Current
Digital
Indication
Voltage
Digital
Indication
HVDC
Supplied
→〇←
HVDC
Negative
feedback
3.TechnicalpropertiesandFeatures
spec.
Item
40/360/260/360/580/2100/2120/2120/5
RatedVoltage(kV)
4060606080100120120
RatedCurrent(mA)
32352225
RatedCapacity(W)
120120180300160200240600
Cabinetweight(kg)7224.52334．5
Weightofvoltage
multiplyingbarrel(kg)
integra
te
2.533.82.5444．5
Barrelheight(mm)
integra
te
400400500400500500500
Voltagemeasuring
accuracy
Readingindigitalmeter1%±2minimumunit
Currentmeasuring
accuracy
Readingindigitalmeter1%±2minimumunit
Wave-grainedcoefficient≤0.5%
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Voltagestability≤1%forstatisticwavemotion,whenpowersupplychange
±10%
OverloadabilityForvoltage:1.1ratedvoltage10min,forchargingcurrent:
1.5ratedcurrent
Powersource1phase,AC,50-60Hz,220V±10%
DutyOperationatintervals;Continuous30min
Environment
Temp:-10～40℃
Humidity:≤85%25℃
Elevation:≥1500M
TestedobjectrangeNolimitfortestedobjectcapacitance
Max.ChargingCurrent:1.5ratedcurrent
StructurefeatureTheEpoxyStrengthenInsulatedtubeisappliedfor
voltagemultiply.Airspaceinsulationinside,noleakage.
OperationboxHighprecise0.75U
DC1mA
buttonwithsinglecontact
(accuracy≤1.0%)
WhichsuittotestforZnOarrestorspecially
Over-voltageprotectionbyadialplate.
Theboxcanbeusedbybothinstandingorinlyingway
4.Functionintroduction
1234
6
57
811
910
(1)Grounding.Terminalofcontrolbox,voltagemultiplierandtestedobjectare
connectedatonepoint,andthenconnectedtoearth.
(2)MediumFrequencyandmeasuringcablefastconnectionsocket.Itisforconnection
ofcabinetandvoltagemultiplier.Whenconnecting,cableplugrotatestoposition
clockwise.Whendismantle,rotatethecablepluganti-clockwise.
(3)Connectto220Vpower.
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(4)Over-VoltageSetting.UnitiskV;settingvalueis1.1timesoftestvoltage.
(5)VoltageMeter.
(6)CurrentMeter.
(7)PowerSwitch.
(8)TheKeyfor0.75UDC1mAFunctionforoxidizedthunderarrester.Itiseffective
whenredlampison.Whenpressingyellowbutton,yellowlampon,outputhighvoltage
isloweredto0.75%oforiginalvoltage.Pressgreenbutton,redandyellowlampareoff,
HVoffandexitingfrom0.75%status.
(9)HVOn(whenitlightsasred,HVison).Whengreenlampison,pressthered
button,redlampison,andgreenlampoff,thenoperatorcanraisevoltage.Thebutton
iseffectivewhenvoltagepotentialmeterisbacktozero.Ifpressingredbutton,red
lampandgreenlamparebothlighting,andreleasingthebutton,redoffgreenon,it
means,protectioncircuittakesaction.
(10)HVOff(whenitlightsasgreen,poweristhroughbutHVisoff).
(11)PotentialController.Itraisesvoltagewhenrotatingclosckwise.Itlowersvoltage
whenrotatinganti-clockwise.Pressresetittozerobeforeraisingvoltage.
DrawingforVoltagemultiplier:
1.HVoutletconnector
2.Multiplierbarrel
3.groundingterminal
4.supporter
5.MediumFrequencyConnector
6.upperandlowerflangeconnection
Belowisdrawingfortestloopwireconnection:
放电棒
试品
专用地线
高压发生器
控制箱
AC220V
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5.TestMethods
5.1Forgeneraltest,afterwireconnection,hangthetestedobjecttoair,raisetotest
voltage,readI,thenconnecttestedobject,raisetotestvoltage,readtotalcurrent
I1;testobjectleakagecurrentI0=I1-I’
5.2whenitisrequiredtotestexactleakagecurrent,connectDHIHVmAmeterasto
below:
mAmeterconnectedtotestedobjectCXHVside
ThemAmetershallbewithshielding,andtheshieldingwireconnectedwithtested
object.HVconductshieldingwireshallbeconnectedtightlywithshieldingofmeter.
Iftestedobjectisdirty,andmighthaveeffectofleakagecurrent.Thenwindmetalwire
throughHighpotentialoftestedobject,andconnecttoshieldingofHVconductwire.
Seebelow:
6.OperationProcedure
1.Checkbeforestart
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2.Connectpowerwire,cableandgroundingwire.Protectiongroundingwire,work
groundingwireanddischargerodgroundingwireshallbeconnectedtothesingle
groundingwireofthetestedobject.DHVspecialgroundingwireshallbeadopted.No
connectionwireshallbeseriesconnected.
3.Powerswitchisputoffpotion;checkregulatorpotentialmetershallbeatzeropoint.
Overvoltageprotectionis1.1timesoftestvoltage.Raisevoltageatnoload,checkits
sensitivity.
4.Connectpower,andgreenlighton,anditmeanspowerison.
5.Pressredbutton,andredlighton,HVison.
6.Clockwiselyregulatesthepotentialmeter.Outputterminalstartstoraisevoltage
fromzero.Afterrisingtorequiredvoltage,recordcurrentmeterreadings,andcheck
whethercontrolcabinetorHVoutputwireisnormalornot.
7.Lowervoltage.Regulatorpotentialmetertozero,thenpressgreenbutton.CutoffHV
andturnoffpowerswitch.
8.DoleakageandDCvoltagetesttoobject.Connecttestedobjectandgroundingwire,
checkandensurethatthereisnoproblem.Thenturnonpower.
9.Raisevoltagetorequiredvoltageorcurrent.Thevoltagerisingspeedis3-5kVper
second.Forbigcapacitytestobject,testershallmonitorcurrentmeter,makesurethat
thechargingcurrentdoesnotexceedmaximumchargingcurrentoftestequipment.For
smallcapacitanceobject,lighteningarrester,forinstance,raisevoltageto95%oftest
voltage,thenslowlyraisevoltagetorequiredvalue.Thenreadvoltageorcurrentvalue
frommeter.
Forinstance,todomeasurementof0.75UDC-1mA,raisevoltagetoUDC1mA
voltage,thenpressyellowbutton.Thevoltageisloweredto75%oforiginal.Atthis
status,thecurrentcanberead.Aftermeasure,regulatepotentialmeteranti-clockwise
tozero.Pressgreenbutton.Ifnextvoltagerisingisneeded,pressredbutton.
IfnecessaryouterconnectHVdivider,andcomparesvoltageoncontrolbox.
11.Aftertestover,lowervoltageandturnoffpower.
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7.TroubleShooting
8．Components
1Controlcabinet
2HVvoltagemultiplierbarrel
3manual
4certificate
5current-limitresister1pc
6dischargerod;groundingwire
7Powercable
8Specialgroundingwire
9Medium-frequencyoutputcable
10Sparefuse
ItemphenomenonreasonMethod
1Afterswitchon,greenlampis
noton,funisnoton,either
1.powerwireisoff
2.powerfuseisoff
Replacepowerwire
Replacepower
fuse
2Pressredbuttonanditisnot
on
Regulatorpotential
meterisnotbackzero
Putpotentialback
zero
3Pressredbuttonanditison.
Raisevoltage,redlampisoff,
andgreenlampon
HVoutputterminal
groundingtestedobject
isshort-circuited
Checkoutput
cable;
Checktestedobject
4
Duringvoltageraising,red
lampisoff,greenlightison.
Dischargefromtested
object,orbreakdown,
overvoltageor
over-currentprotection
Checktested
object;
Resetvalue
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