training nbe 400v ac system r0

7/28/2019 Training NBE 400V AC System R0

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NEWBONGESCAPE

400VAC

Switchgear

(3.6)

Oct.2012

TRAININGMANUAL

Vol.III:BALANCEofPLANT


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400VACSwitchgearContents

1.General Introduction2.Major TechnicalData3.Design

4.Outline DrawingandInstallation5.Operation

6.Inspection andMaintenance


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400VACSwitchgear

Notes:

Whileoperatingelectricaldevicestherearesomepartsundercurrent.Onlystaffwho

hasreceivedrelevanttrainingandwhichisfamiliarwiththesafelydefinitionof

electricaldevicescanexecutesuchworkasinstallation,trying,maintainsand

modification

.


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400VACSwitchgear

1. General Introduction


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400VACSwitchgearGeneral

Introduction

The400VACstationsupplysystemshallbeprovidedwith400VACdistributionboardssuppliedfrom4

(four)setsof11kVgeneratorswitchgearthrough2(two)setsof

11000/400Vdrytypeauxiliary

transformerseach

of

1600kVA

as

per

the

load

calculation

of

the

plant.

The

system

shall

also

be

supplied

fromonesetofdieselgeneratorofsufficientcapacityincaseofblackoutandblackstart.

Thesystemshallbemadeofnonessentialbusandessentialbusconnectedbyabustiebreaker.The

nonessential

bus

with

main

bus

1shall

supply

to

non

essential

loads

and

unit

auxiliary

loads,

while

the

essentialbuswithmainbus2shallsupplytoessentialloadsandunitauxiliaryloadsasbackuptomain

bus1.

Themain400VACdistributionboardsshallbeinstalledindoorin theauxiliaryelectricalroomatelevation245mondownstreamsideofthepowerhouse.


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400VACSwitchgearStructure

TheframeisconsistsofsquaresteelstubeswithYsectionconnectedbyrivets.


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Theframebaseoflowvoltagecabinetisconsistsoffoursquaresteeltubes.Itcaninstallonthetrough

directly.Thecabinetisassembledwithparts,suchasdoors,rearplates,sideplates,partitions,supports,

busbars,functionalunit.Thedimensionsofpartsandpartitions

aremodular.


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Therespartitionbetweeneverypanelormainbusbarandunits.Passagewaysofcablesaresealed.The

equipmentscanensurethatforfaultsineverycircuit,changethebreakersandcomponents,inspectand

repairthecableswithoutswitchingoffmainbusbar.


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Forthecabinet,thecablescancomeinfromtoporbottom.Insidethecabinet,thereshorizontalcable

ductandverticalcableduct.Theyarecompletelyseparatedwith

horizontalbusbar.Theverticalcable

ductisfromhorizontalcableductontoptothehorizontalcableductonbottom.


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ThematerialofmainplugincontactsisBe

Cualloy.Theyaremadeofmultiplesprungsilverlamination

andconnectwithCdropperbars.Be

Cualloyhastheabilitiesofresistpressureandflexibility.Multiple

sprungsilverlaminationhasconductivity.Andtheyaugmenttheinterfacebetweencontactsand

dropperbar.

The

problem

for

the

life

of

contact:

the

main

plug

in

contacts,

which

are

made

of

Be

Cu

alloyandmultiplesprungsilverlamination,arealwayspressed.

Insomecompressingdistance,thelifeof

maincontactscanbeincreased.


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Inthelowvoltagecabinet,themainbusbaranddropperbarareCcopper.


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400VACSwitchgear400V

AC

Switchgear

Pictures

PhysicalPicture


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400VACSwitchgear

2. Major Technical Data


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400VACSwitchgearSystem

Parameter:

Detail information refer to the specif ication NBE-207-02-001_R1


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400VACSwitchgear

3. Design


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400VACSwitchgearDesign

The400Vlowvoltagedistributionboardsshallbedesigned,manufacturedandtestedinaccordancewithIEC

60439andIEC60529.

Thedevicesprovidedwiththeswitchgearassembliesshallincludelowvoltagepoweraircircuitbreakers,

molded

case

circuit

breakers,

busbar,

current

transformers,

voltage

transformers,

meters,

indication

lamps,

relays,controlelementsandassociatedwiringandtestblocks.

Lowvoltagepoweraircircuitbreakersshallbe3poleelectricallyandmechanicallytripfreedrawouttype

andshallbecompletedwithinterpolebarriersforeliminatingallfaultcommunication,arcquenchers,

manualand

electrical

stored

energy

operating

mechanism,

mechanical

position

indicator,

and

shall

be

mountedonadrawoutmechanisminthebreakercompartment.

Allmolded

casecircuitbreakersshallbelocalmanualoperatedfixedtype

andshallhavethermaland

magnetictrippingdevices.

Theremoteelectricallyoperatedcircuitbreakersshallbeequippedwithpushbuttonsforlocalcontrol,andaLocal

Remote

selectorswitch.Allelectricallyoperatedcircuitbreakersshallbeprovidedwithsufficient

numberofauxiliarycontactsforoperation,control,interlockingandlocal/remoteindication.


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400VACSwitchgearDesign


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400VACSwitchgear

4. Outline Drawing and Installation


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400VACSwitchgearGeneral

Installation

Requirement:

Regulatethefirstcabinets/transportationunit.

Installthenextcabinetaccordingtothearrangeorder,andconnecttheframeofcabinettillthe

arrangementis

ended.

Cleantheconnectionareaofmaincircuitandconnectthemaincircuitandaux.circuit.

Installcablestofeedcabinets(payattentiontotorque).

Connectearthingpointofcabinetstooverallearthingsystem.

Duringthe

above

process

be

sure

that

connections

points

of

main circuits/transportationisolatedpointsmustreachthetightentorque.

Eachblockof400VACcabinetshallbeearthedatleastwith2points

Afterinstallationfinished,cleanthelocationandthematerialswhichareinsidethecabinets.Alsocleanthe

partswhich

are

irrelevant

for

the

running

of

the

cabinets

such

as

tools,

packing

material,

conductions.

Lockthedoor

N B E B l f Pl t


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400VACSwitchgearGeneralInstallationMethodontheGround(recommend)

Whentheincomingunitisfrombottom,thecableslotisrequiredontheground.

Cabinetsshould

be

installed

on

the

pedestal

which

is

embedded

in

the

concrete

ground.

The

horizontal

error

of

the pedestalis1mm/permeter.

Cabinetsshouldbeconnectedwiththepedestal(withweldingorscrews).Thegroundingisreliable.

Thelengthofweldinglineinfrontandbackofeverycabinetis

20mm.Allweldinglineshouldbecoatedwith

antisepsis.Whenfixingcabinetsonthepedestal(withweldingorscrews),Thehorizontalerrorofthepedestalis

1mm/permeter.Thegroundingisreliable.Allweldinglinesarecoatedwithantisepsis.Toensurethe

bendingradiusofcablesandenoughspace,suggesttheminheightofcablechannelis500mm.

New Bong Escape Balance of Plant


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400VACSwitchgearThe

Sketch

Map

for

Installing

BLTS



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400VACSwitchgearThe

Sketch

Map

for

Connection

Between

Cabinets



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400VACSwitchgearThe

Sketch

Map

for

Connecting

Busbar

Between

Cabinets



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400VACSwitchgearCable

Connection

The sketch map of connection for control

busbar between cabinets



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400VACSwitchgearCable

Connection

The sketch map of di rect connection for

breakers and loading components

The sketch map for connection without

holes between cables and C-copper


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400VACSwitchgearInspect

in

Incoming

Unit

Inspect the type of breakers. Copper connection of breaker.

Inspect whether degree of protection (distance between phases, creepage,distance, arc distance) meets

requirements.

Inspect the action property of breaker (switch on and off 5 times).

Inspect whether mechanical interlock system is reliable.

Inspect whether control circuit.

InspectinFeederUnit

Inspect whether components meet requirements.

Internal interlock of mechanical and electrical parts whether is reliable.

Inspect whether panel can be operated normally (including contacting property of insert parts).

Inspect whether electrical and mechanical interlock are reliable.

Inspect action property in control circuit and main components (switch on and off 5 times).


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400VACSwitchgearEliminate

the

general

faults

Whenhavingfaults,youmusttaketheemergencystepatthefirsttimeonsite.Recordthephenomenon.

Thegeneralfaultscanbeeliminatedasfollowingsteps:

No. Fault Possible reason Solution

1Main circuit breaker can not switch on

There is no control voltage. Switch on control power breaker.

Voltage inspector does not work.Adjust or replace the voltage inspector

Under voltage release has not been energized/ damaged. Check the wiring or replace the coil.

2Feeder circuit breaker is tripping.

The setting value of overload/short is too low. Reset the overload/short setting value

Load or its wiring has mistake. Eliminate loading faults.

The breakers capacity is too small. Increase the switchs capacity

3 Theres fog/ taste. Connection area of conductor didnt tighten. Stop the power supply and tighten the connection points.

4 Capacitor unit cabinet does not work.No load and the current is too small.

See manuals of components for other faults.Use again when having more loading.

5 Faults of other components See manuals of components



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400VACSwitchgearEnergizingLoadBreakers

ACB in Fixed Uni t Cabinets

Infixedunitcabinet,energizingmethodofACBisthesamewith

incomingunitcabinet.Butbefore

energizing,

inspect

the

isolation

for

loading

cables.

If

the

isolation

of

cables

is

no

problem,

operate

the

breakeraccordingtoabovementionedsteps.



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400VACSwitchgear

Adjust the Protective Value of BreakerNZM2

NZM2

PKZ2



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400VACSwitchgear Give Operating PowerControl operating power is the main factor to start up circuits. Therefore, before energizing, give

working power in time for all loads in loading circuit.

State of Normal Running

When normal running, it should be light for the white indicator lights of control bar. When normal running, all doors

of cabinets should be closed and each panel are in connection position. Operating handle of panel is in I.



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400VACSwitchgear

Monitoring Item of Normal Running

Voltageofthreephaseswhetherisnormalbyobservingvoltagemeter.Ifthererecurrentmetersinthe

circuit,pleaseinspectthecurrentduringrunning.Ifitsnecessary,pleaseinstallthetongtestammeterto

inspectthebalanceofthreephases. Ifitsdigitalfunctionalmeter,onlyoperatefunctionalkeystolook

the

current,voltage,powerandsoon

Monitoring Item of Equipments for Stopping Running

Whenstoppingrunning,theindicatorlightOFF

ison.The

handleofbreakerisino

position.Switchoff

thebreaker.



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400VACSwitchgear6.Maintenance

MaintenanceinRunning

Iftheequipmentshaveproblemsduringrunning,ortermmaintenanceandinspection,cutpowerfor

runningequipment.Afterfinishingmaintenance,givepoweragain.

The following points should be attended.

Inspectthoroughlyforthismaintenance.Theinspectionwhetherperfectreally.

Inspectthesiteofmaintenance,mainincomingcircuitbreakermustinconnectionposition.Powerstorageof

breakeris

ok.

Beforestartinguprunningagain,itmustbeensuredthatallbreakerloadhasntfaults.Theisolationofcables

is10M.Energizingbreakeriscorrespondingwithcableload.

Resumetostartupreferringtotherequirementsinfirsttime.

MaintenancePeriod

Suggest:newrunningequipmentsaremaintainedoneyear.Later,maintainonceevery2to5years.(Depend

onenvironmentoraskmanufacture.)



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400VACSwitchgear StepsforMaintenance1.Maintenancepersonshouldbetheprofessionalelectricianwhoistrained.Faultsshouldberecorded.

2.Checkindicatorlightswithpower.

3.Switchoffmainpower(includinghighvoltagepart),auxiliarypowerandcontrolpower,checkitandsure

thereis

no

power

and

connect

main

circuit

to

ground

4.Openallcabinetdoorsandcheckmaincircuitconnection

points

torque,meanwhilecheckwhetherthere

isbreakdowncausedbyoverload

5.Carbonizationhasappearedcheckandmaintenancetherelevantpartsandchangethedamagedparts.

If

the

color

has

changed

but

it

still

has

gloss

tighten

the

torque.

6.Checkwhetherthereisuncommonphenomenon,ifthereispleasechecktherelevantconductorofmain

plugandchangedamagedpartsAttention:mainplugofwithdrawablecomponentsandcannotattach

object,plugscanbeusedagainaftertheywerecleanedandpaintedVaseline)

7.Cleantheinsideofcabinetwithbrushandcloth(ifthereiscontrolwiringdropped,tightenitagain)

Cleantheoutsideofcabinets(solventisnotpermitted)



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400VACSwitchgear

Itemsbefore/aftermaintenance

Before Maintenance

MaintenanceworkcannotdowithpowerON.

Mainand

auxiliary

power

relevant

wirings

must

be

switch

OFF.

WithdrawablepartsandcomponentsmustbesettoOFF

position.

Verifythereisnopower.

Shortandgroundconnectionprotectionmustbedone.

After Maintenance

Toolscannotleaveincabinets.

Disconnectprotectiveactions

Check

isolation

and

make

a

record.

Takeawaylockingdevices

Placewithdrawablepartstoconnectionposition

Supplythepower



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400VACSwitchgear

THANKYOUFORATTENTION!

training nbe 400v ac system r0

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