online lvmv#10

8/11/2019 Online LVMV#10

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LV&MVSwitc gears#10

By:

AhmadMokhtariMobile:

09125137028

Email:[email protected]

5th May7th July,2014


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Equipmentbehaviour

ur ngs ort

c rcu ts

1. Passiveequipment

.


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Activ i m nt

clear shortcircuit currents, i.e. circuit breakers and

fuses.

This property is expressed by the breaking capacityand, if required, the making capacity when a fault

occurs.


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12

2

0 0.01 0.02 0.03 0.04 0.05 0.06 0.07 0.08 0.09 0.1

3

8

CurrentLimiting NoncurrentLimiting


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12

2

0 0.01 0.02 0.03 0.04 0.05 0.06 0.07 0.08 0.09 0.1

3

8



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12

2

0 0.01 0.02 0.03 0.04 0.05 0.06 0.07 0.08 0.09 0.1

3

8



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MakingCurrent

12

7

2

0 0.01 0.02 0.03 0.04 0.05 0.06 0.07 0.08 0.09 0.1

3

8


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LV Circ it Br ak r T

MoldedCaseCircuitBreaker(MCCB)

MiniatureCircuitBreaker(MCB)


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Circ it Br ak r T

MCCB:up1600A,motorizable


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LVCircuitBreakers

ACB

ACB


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This is the external cover of the MCCB which houses

all the sensing and operating components.

Resin/glassfiber materials, with high dielectricstrength.

It is to be noted that the case is moulded and assuch, it is not possible to access the internal

components in case of any failures and it will benecessary to replace the complete MCCB under those

.


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case circuit breakers but as their name implies, theseare smaller in size and are mostly used for current

ratings below 100 A.

These are normally available in single pole

(SP), single pole neutral (SPN), double pole

DP , triple pole TP , triple pole neutral TPN andfour pole (FP) versions.


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Rateduninterru tedcurrent Iu

Ratedcurrent,

In

Ratedultimate

short

circuit

breakin

ca acit

Icu

Ratedserviceshortcircuitbreakingcapacity,Ics

Ratedshortcircuitmakingcapacity,Icm

RatedshorttimewithstandcurrentIcw(1sec.,3sec.)


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Rated

current,

In

Ratedultimate

short

circuit

breakin

ca acit

Icu

Ratedserviceshortcircuitbreakingcapacity,Ics

Rated shorttime withstand currentIcw 1sec. 3 sec.


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Ratedcurrent,

In

Rated

ultimate

short

circuit

breaking

capacity,

Icu Ratedserviceshortcircuitbreakingcapacity,Ics

Ratedshortcircuitmakingcapacity,Icm

RatedshorttimewithstandcurrentIcw(1sec.,3sec.)


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Utilization cate or A

Without an intentional shorttime delay forselectivity under shortcircuit condition and

rating.

Utilization Category B

With an intentional shorttime dela (which ma

be adjustable) provided for selectivity undershortcircuit conditions.


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Rat Sh rttim With tan C rr nt


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MCB

Fort eBthebreakermusttri betweenthelimits

of

3

to

5

times

rated

current

FortypeCthebreakermusttripbetweenthelimitsof5to10timesratedcurrent

FortypeDthebreakermusttripbetweenthelimits.


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NS250L(breakingcapacity150kA)

C60N(breakingcapacity10kA)


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MVCircuitBreakers


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SF6

circuit

breakers

Vacuumcircuitbreakers


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Ratedshortcircuitmaking

Ratedshorttimewithstandcurrent(1sec.,3sec.)


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S tati n

Mediumvoltage

switchgear

rooms

Lowvoltageswitchgearrooms


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. installedinseparaterooms.


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2. Inthecaseofsinglerowarrangement,apassageway

.

.

.

3. Ontherearsideoftheswitchgearaclearanceof11,5mshallbeforeseen.

1.5m

1.5m


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4. Inthecaseoftworowarran ement thepassagewaybetweenthetwooperatingpanelsshallbemin.11.5m.

1.5m


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5. Theroomheightshallbemin.4m.(clearheightfrom

.

4m


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Inc min T

1. Cable 1. Top

2. Busduct 2. Bottom


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1CableBottom


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2CableTop


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3BusductTop


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4BusductBottom


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