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LV&MV

Switchgears#8

B :

AhmadMokhtari

Email:indelectrainer@gmail.com

5th May7th July,2014

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Useofcontactorswithhighercoilsealing

ower

UseofDCoperatedcontactors

Re uction

o

t e

contro

supp y

vo tage

a ow

forvoltagedrop)

Parallelswitchingofaresistance.

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o or ar er:

rcu rea er:

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CRITERIA FUSEDCONTACTOR CIRCUITBREAKER

Operation

HealthandSafety

.

reliablearc

quenching

throughout

theentirecurrentrange.

Higherarc

flash

hazard.

CurrentLimitation FaultcurrentlimitationduetoHRC

fuses. Nofaultcurrentlimitingcapability.

LetthroughEnergy

Reduced20x.Allowspowercablesto

besizesmaller.Significantcost

savin soncables.

Fullfaultenergyexposure.Power

cablestobesizedtomaximum

s stemshortcircuitlevel.

Verylowduetolimitedletthrough

faultcurrent.

Veryhighonmotor,consistent

withshortcircuitlevel.

Longerlifeexpectancyonmotor

insulation.

Degradationofinsulation

expected.

Service life of

interrupter 1,000,000COoperations 20,000to30,000COoperations

Maintenance Maintenancefreethroughoutservice

Requiredplannedmaintenance..

Footprint Very

small

0.365

m2.

Significant

cost

savingsonEHouse.

Average1m2.

Large

area

to

house

switchgear.

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1. Current&Volta eSam les

2. PowerSupplyofControlCircuit

3. Closin Circuit

4. OpeningCircuit

6. IndicationLamp

.

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6kV

3I

3

3

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:

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:

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Type 1

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Type 2

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:

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