TextContentsTextThePowerFuseApplicationThe

FUJI

current-limiting

power

fuses

are

available

as

either

general

purpose-types

orback-up-types.Generalpurposefusesareprovidedwithawiderangeofinterruptingperformance.Theycan,forinstance,interruptexcessivecurrentsinthe200%-300%rangeuptomassiveshort-circuit

currents.This

indicates

that

they

can

interrupt

currents

including

the

fuse

element’

s

meltingcurrent.SincetheyarethemostreliabletypeoffusetheycanbeattachedtotheFUJILBS,LB-typeairloadbreak

switches.TheycanalsobeappliedindependentlytoH.V.circuitstogivethemadequateoverloadprotection.Back-upfusesareusedincoordinationwiththecircuitbreakerwithtripdevice,OCRandCT.TheOCRoperatesinthefaceofsmallovercurrentapprox.Althoughthepowerfusehasanexcellentperformanceagainstmassiveovercurrentyetithasatendencytoexplodeagainstthesmallovercurrent.Thereisaregionwherefusibleelementmeltsbutinterruptionmaynottakeplace.Inthiscasethecircuitbreakerisrequiredtocoverthisregion.TheInstrumentTransformerVT&CT3.45/6.9/11.5/23/34.5kVUpto5000AmpsDescriptionFUJIepoxyresinmoldedtypeCTandVTfeatureexcellentwater-anddamp-proofcharacteristics.Thereisnodangerofinsulationdeterioration.Theirgoodthermaland

mechanicalperformancemakethemsuitableforawiderangeofapplications,whiletheinitialcostofVTandCTareveryreasonable.Features(1)Accuracy:Class1.0(2)Nocoronaisproduced.FUJI’s

advanced

manufacturing

techniques

eliminate

cracking

of

molded

enclosure.VTisprovidedwithacurrent-limitingfusetogivealargeinterrupting

capacity.Selection

notesPrimary

current

of

CT

must

be

150%

of

the

load

current

of

measuring.Ratedovercurrentconstantmustbeconsideredwhenusedforcircuit

protection.Accuracy

class,

rated

burden

and

maximum

voltage.WhendeterminingVA,addsecondarywiringorcabling

burden.GeneralspecificationsCurrenttransformer(CT)(1)

Accuracyclass:1.0Maximumvoltage:Upto34.5

kVRatedfrequency:50/60

HzSecondary

current:

5

AVoltagetransformer(VT)(1)Accuracyclass:1.

0Maximumvoltage:Upto33

kVRatedfrequency:50/60

HzSecondaryvoltage:110

VEpoxyresinmoldedCT:NCE,CEC,CEAandCEtypesNCE,CECandCEAareusedindistributioncircuitsofupto6.9kV.Onlytheprimary

and

secondary

windings

are

molded

in

epoxy

resin.

CE

type

is

designed

for

use

incircuits

between

11.

5-34.

5

kV.

Iron

core

windings,

terminal

stand

and

insulation

are

allintegrated

into

one

body

and

encapsulated

with

epoxy

resin

in

a

vacuum.

The

iron

core

isfabricated

from

silicon

steel

plate

which

ensures

an

excellent

electrical

performance.

Thecorona

and

insulating

characteristics

are

excellent

so

assuring

a

long

service

life.

There

isnofearoftheepoxyresincracking.Thetransformeriscompactindesignandtakesuplittlespaceon

installation.NCE

type:

10

/

5-750

/

5

Amps,

6.

9

kVCEC

type:

10

/

5-200

/

5

Amps,

6.

9

kVCEAtype:300/5-2000/5Amps,6.9kVCEtype:50/5-5000/5Amps,11.5-34.5kVEpoxyresinmoldedVT:NPE,PECandPEtypesThesetypeshavebothprimaryandsecondarywindingsmoldedinepoxyresin.Theinsulatingresinisalsostrongagainstchemicalattackwhichmakesthetransformersuitableforu