Electrical Panel Selection
Prepared in collaboration with:
M/s. Power Engineering,
Plot No. 552, Industrial Area, Phase- IX, Mohali
Contact Person: Sh. B.S. Verma, 9417233527
Typical Power System
Types of Power Connections
•
•
•
•
LT
< 50KW.
HT
> 50KW.
Independent feeders 11KV.
High Voltage Transmission/ Distribution is Preferred
because of Low losses & Reduced size of Conductors
during transmission.
• The power is transmitted at high voltage and low
current.
• The heat generated during transmission is
proportional to current transmission.
Selection of Circuit Breaker
Power (KW/KVA/HP)
Rated Current.
System Voltage
Breaking Capacity
Making Capacity
Category A or B
Suitability to site Condition (Indian
Condition)
Maintenance Definitions
Effect of harmonics
Calculation Formulas
System for HT/ LT connection
•
•
•
•
•
•
HVPN Supply
GO Switch
HT Metering
VCB
Transformer
LT Panel ( Power control centre, Power factor panel,
AMF)
• Distribution Panel
• Sub Distribution panel
Selection Of GO Switch
Gang Operated Switch
Comprises of :- Lightning
Arresters, GO (gang
operated) switch, Drop off
Fuse(DO), Plate Earthings
two Nos.
for LA (lightening arrestor)
& GO switch.
Selected at 11KV Only.
Selection of CT & PT
• CT (Current Transformer /5A)
Selected as per the full load
current of Transformer.
• PT ( Potential Transformer) As per
the system
Voltage.(11Kv/220v/110v/24V)AC
• Calculation of HT Current for CT
KVA/11KV/1.732
• Example:- Transformer rating ( HT
current for CT/PT selection)
500Kva/11KV/1.732 = 26.24
• Tri vector Meter selected as per
HT Current.
VCB Panel
• Vacuum Circuit Breaker
• For Switching carrying
Normal Current and
Breaking abnormal current
at High Voltage.
• 630A ( Short circuit current)
and Above.
• Over Load, Short Circuit &
E/F protections.
• Measurement of current,
Voltage etc.
Transformer
• 11KV( input)/433V ( Output)
• Selection of Transformer as
per Total load.
• Buckle relay and winding
temperature for safety of
Transfer. These help to trip
VCB.
• Silica gel to check moisture
content. If blue- Ok, If white
or light pink- replace it.
LT Panels
PCC--- Power Control
Center.
MCC- Motor Control
Center.
AMF- Auto Mains Failure
Panel
APFC- Automatic Power
Factor Correction
Distribution Panels.
STARTER FOR THREE PHASE
INDUCTION MOTOR
Starting is a process in which a motor’s rotor is
brought from zero speed to rated speed.
The force to rotate in angular movement is
called Torque.
Direct On Line Starters used upto 10 HP
Star Delta Starters
o
o
o
o
Manual Star Delta Starters ( not used)
Automatic Start Delta Starters
Soft Starters
VFD
Starter Panel for Induction
Motors
1.
2.
3.
4.
5.
6.
Contactors + Over Load + MCCB / MPCB
Motor Protection Relay
On delay Timer + Capacitor Duty Contactor + Capacitors
Under Voltage & Over Voltage Relay
Hour Meter
Time Switch
Components To Be used In Starters
DOL– MPCB-1No,Contactor- 1No, Push Button 2Nos. On
Indication 1 No., single phase preventer 1 No Up to
10HP,
Star Delta Starter– MCCB 1no, Contactors 3nos,MPR1no, star-delta Timer 1No, Ammeter with CT 1 No, Push
Button 2no, on Indication 1no., single phase preventer 1
No.
Soft Starter- MCCB 1 No, Semiconductor fuses 3 Nos.,
Line Contactor 1 No, Soft Starter 1 No. ( with built in
bye-pass contactor & soft starter selected as per duty or
application), Push Button 2 Nos.
VFD- MCCB 1 No, Semiconductor fuses 3 Nos, VFD1 No.
Push Button 2 Nos. Input/ Out put Chokes.
REDUCTION IN KVA DEMAND DUE TO
POWER FACTOR
LOAD - 900 KW
EXISTING P.F. (COS Ø 1)- 0.6
DESIRED P.F. (COS Ø2) - 0.92
COS Ø. =
KVA
=
kW
kVA
kW
cos Ø.
KVA 1 =
900 / 0.6 = 1500
KVA2 =
900 / 0.92 = 978
Ø.
KW
Reduction in KVA
1500 - 978 = 522
REDUCTION IN LINE
CURRENT
KVA1 - 1500
KVA
=
KVA2 - 978
I
=
I1
=
Reduction in Current
2087 - 1361 = 726
I2
√3 V I
1000
KVA x 1000
√3 x 415
1500 x 1000
√3 x 415
=
2087 Amp
=
978 x 1000
√3 x 415
=
1361 Amp
Selection of Capacitor
• Configuration of capacitors
1. Individual Compensation
2. Group Compensation
3. Central Compensation
• KVAR required ( Capacitor)
= KVA X √(1- PF(E)²) - KVA X √(1- PF(T)²)
Existing Power factor from HVPN= PF(E) i.e. 0.6 to 0.75
Target Power factor for system = PF(T) i.e. 0.99
Advantage of Soft Starter
It starts the motor rotor from zero to
designed speed thereby reducing initial
load on system.
The star Delta starts generally starts with
jerk i.e. 30 % of designed speed.
Soft starters are preferred at high heads.
Direct on Line
START
Line Contactor
Overload
% VOLTS
100
80
60
40
20
0
Run
Start
TIME
Run Contactor
START
Line Contactor
Resistors
Primary
Resistance
Overload
% VOLTS
100
80
60
40
20
0
Run
Start
TIME
Autotransformer
Star Point
Contactor
START
Transformer
Contactor
% VOLTS
100
80
60
40
20
0
Line Contactor
Overload
Run
Start
TIME
START
Star Point
Contactor
Star Delta
Delta
Contactor
% VOLTS
100
80
60
40
20
0
Line Contactor
Overload
Run
Start
TIME
Soft Starting
START
% VOLTS
100
80
60
40
20
0
Run
Start
TIME
EBG – Electrical Standard Products
Basics of AC Drives
• Frequency controls Motor
IMSspeed
2 Product Familiarisation
• Supply Voltage controls Motor Torque
• Supply Voltage is varied in proportion to
supply frequency so as to keep torque
constant
LARSEN & TOUBRO LIMITED.
GOOD TERMINATION PRACTICE
DO’s AND DON’Ts
TERMINATION WITH
BUSBAR/LINK
DON’T
DO
DON’T
DO
DON’T
DO
DON’T
DO
TERMINATION WITH
LUGS
DON’T
DO
DON’T
DO
DON’T
DO
DON’T
DO
MCB (Miniature Circuit Breaker),
• Rated current not more than 63 A, Thermal or
thermal-magnetic operation.
MCCB (Moulded Case Circuit Breaker)
• Rated current above 32 A upto 630 A, Trip
current may be adjustable, Thermal or
thermal-magnetic operation.
Air Circuit Breaker
• Rated current from 800 A upto 6,000 A,
• Trip characteristics often fully adjustable including
configurable trip thresholds and delays.
• Usually electronically controlled—some models are
microprocessor controlled.
• Often used for main power distribution in large
industrial plant, where the breakers are arranged in
draw-out enclosures for ease of maintenance.
MCB Selection
• Overload which is intended to prevent the accidental overloading of the
cable in a no fault situation. The speed of the MCB tripping will vary with
the degree of the overload. This is usually achieved by the use of a
thermal device in the MCB.
• The second characteristic is the magnetic fault protection, which is
intended to operate when the fault reaches a predetermined level and to
trip the MCB within one tenth of a second. The level of this magnetic trip
gives the MCB its type characteristic as follows:
Type
Tripping Current
Operating Time
Type B ( Domestic)
Type C ( Industrial)
Type D ( Capacitor)
3 To 5 time full load current
5 To 10 times full load current
10 To 20 times full load current
0.04 To 13 Sec
0.04 To 5 Sec
0.04 To 3 Sec
Fuse and MCB characteristics
• The fuse and the MCB, even though their nominal
currents are similar, have very different properties.
• For example, For 32Amp MCB and 30 Amp Fuse, to
be sure of tripping in 0.1 seconds, the MCB requires
a current of 128 amps, while the fuse requires 300
amps.
• The fuse clearly requires more current to blow it in
that time, but notice how much bigger both these
currents are than the ’30 amps’ marked current
rating.
• Fuse require replacement after blowing but MCB
only switched on.
ACB
ACB
Cable Selection
•
•
•
•
•
•
Armoured Cables ( For Out door, under ground)
Unarmoured Cables ( for indoor but open in cable trays)
Submersible cables
Size of Cable ( as per load)
Insulation on cable ( PVC, XLPE)
Core 3 ( where neutral not required) or 3 ½ cable ( where
neutral required)
• 3 core cable in HT, Motor, capacitor
• 3 ½ Core in light load,
Insulation over cable
• Poly Vinyl Chloride
• Cross-Linked Polyethylene (XLPE)- Less
deformation below 100°C, Lower in cost,
Lower dissipation factor, Lower dielectric
constant, Higher dielectric strength Physically
tougher, More resistant to chemicals, More oil
resistant
Colour Code for Cables
Single Phase System
Live
Red
Neutral
Black
Ground
Green
Three phase System
Red, Yellow, Blue
Black
Green
EARTHING
BY EARTHING (OR GROUNDING), WE
MEAN MAKING A PHYSICAL AND
ELECTRICAL CONNECTION TO THE
GENERAL MASS OF EARTH.
TYPES OF EARTHING
•
•
•
•
SYSTEM EARTHING
EQUIPMENT EARTHING
LIGHTNING PROTECTION EARTHING
STATIC EARTHING
SYSTEM EARTHING
SYSTEM EARTHING IS THE EARTHING
ASSOCIATED WITH THE CURRENT CARRYING
CONDUCTOR (USUALLY THE NEUTRAL POINT OF
THE TRANSFORMER OR GENERATOR) AND IS
NORMALLY ESSENTIAL FOR THE SECURITY OF
THE SYSTEM.
(This is covered by IS 3043:1987
– Code of Practice for Earthing)
EQUIPMENT EARTHING
EQUIPMENT EARTHING IS THE EARTHING
ASSOCIATED WITH NON CURRENT
CARRYING METAL WORK AND IS
ESSENTIAL TO THE SAFETY OF HUMAN
LIFE, ANIMALS & PROPERTY.
(This is covered by IS 3043:1987
– Code of Practice for Earthing)
LIGHTNING PROTECTION EARTHING
LIGHTNING PROTECTION EARTHING IS
CONCERNED WITH THE CONDUCTION OF CURRENT
DISCHARGES IN ATMOSPHERE ORIGINATING IN
CLOUD FORMATIONS TO EARTH AND IS ESSENTIAL
FOR THE PROTECTION OF BUILDINGS,
TRANSMISSION LINES AND ELECTRICAL
EQUIPMENT.
(This is covered by IS 2309:1989
– Protection of buildings and allied structures
against lightning – Code of Practice)
SYSTEM EARTHING
WHY ?
GREATER SERVICE CONTINUITY
REDUCTION IN OCCURRENCES OF
MULTIPLE FAULTS TO GROUND
FEWER ARCING FAULT BURNDOWNS
EASIER LOCATION OF FAULTS
GREATER SAFETY
POSSIBLE SAVING IN COST
EQUIPMENT EARTHING
WHY ?
1. FREEDOM FROM DANGEROUS ELECTRIC
SHOCK HAZARDS
2. REDUCTION IN FIRE HAZARDS
3. PRESERVATION OF SYSTEM
PERFORMANCE
REDUCTION IN SHOCK HAZARDS
CASE 1 : NO EQUIPMENT EARTHING
LOAD
SOURCE
V
SYSTEM
EARTHING
REDUCTION IN SHOCK HAZARDS
CASE 3 : EQUIPMENT EARTHING WITH PE CONDUCTOR
LOAD
SOURCE
V
SYSTEM
EARTHING
EQUIPMENT
EARTHING
Difference between Pipe and Plate Earthing
•
•
•
•
Plate earthing costly but reliable.
Plate earhing is more efficient.
Less maintenance cost.
Easy to maintain resistance value.
Standard Pipe & Plate Type Earthing Design for the
11 Kv.
Kv. System Equipments, Distribution Transformer
Centers,, L.T. Distribution System Equipments
Centers
• Design Details :
1. Earthing Pit : Size 1000 X 1000 X 1800 mm
Depth.M.S. / C.I. Plate : 500 X 500 X 8 mm
Thick.
2. Electrode Assembly : 40 mm Ø GI / CI
Perforated pipe duly fitted or welded with base
plate and 50 X 6 mm flat termination taken on
top for equipment earthing as shown in drawing.
Standard Pipe & Plate Type Earthing Design for the 11
Kv. System Equipments, Distribution Transformer
Centers, L.T. Distribution System Equipments
4. Mixture - I : Homogeneous mixture of black
soft soil 0.3 CMT. approx.
5. Mixture - II : Homogeneous mixture of
common salt 25 Kgs. + wood charcoal pieces
25 Kgs. + Black soft soil 1 CMT. Approx.
6. Crushed Rock pieces Gravel Size 50 X 35 mm
0.1 CMT. Approx.
7. Arrangement for earthing lead terminations
from equipment body, and connection for
main earthing Grid.
Typical arrangement for Pipe
electrode earthing pit (Bore Type)
• Design Details :
1. 75 mm thick RCC Cover.
2. 300 mm Ø 6000 mm deep (Approx. 20 ft.)
bore in the earth.
3. 65 mm Ø 6000 mm long (Approx 20 ft.) G.I.
pipe electrode. Forged at the top up to 75 mm
length and 12 mm hole provided for taking
earthing connection.
4. A homogeneous mixture of 50 kgs. wooden
coal pieces + 50 kgs. common salt
5. Water pouring purpose at the time of routine
maintenance
No. of earthing Required
•
•
•
•
•
•
Equipment
GO Switch
HT metering panel
Transformer
LT Panel
Electric Motor
Pipe
1
1
1
Plate
2
1
2
2
-
HP of Motor
HP of Motor= QH/4500/efficiency
Q= Discharge in LPM
H= Head of pump in meters
Efficiency varies from 65% to 85%
Motor Start Theory
ME00107A
Type of Insulation and Enclosures for electric
motors
• Insulation Class of winding wire
Class Y- 90°C, Class A- 105°C, Class E- 120°C, Class B- 130°C,
Class H- 180°C
To be used as application.
• Enclosures
Screen Protected, screen protected drip proof, Splash proof,
Totally enclosed fan cooled, Totally enclosed and separately
air cooled, totally enclosed air circuit motor, direct ventilated
motor
Detail of TRANSFORMER and its Accessories
1
2
3
Descripition of Transformer
KVA of Transformer
KW of TR. at P.F -0.8
Full load current of TR.
Details of accessories to
run the transformer
4 Size of cable 3-core
H.T.side ( Aluminium ) in mm2
5 Size of cable 3 1/2 core
L.T. side(Aluminium ) in mm2
Metering panel with C.T./P.T
6 unit
Trivector meter as per TR.
7 rating
HT VCB/SF-6 panel with HT
8 metering
As per TR. Rating.
G.O.switch
with
all
9 accessories I/C D.O.fuse ,
lighting arrestor and stay wire
set, earthing etc.
HT current of TR.- on HT side
10 (Amp.)
11 Impedance %
Capocitor for TR (KVAR) only
12 for TR losses
Capacity
100
75
150
150
125
200
200
175
250
250
200
347
35
35
35
35
1x185 sqmm
1x240 sqmm
1x240 sqmm
2X185 sqmm
15/5 A/110 V
15/5 A/110 V
15/5 A/110 V
15/5 A/110 V
15/5 A/110 V
15/5 A/110 V
15/5 A/110 V
15/5 A/110 V
NA
NA
NA
NA
Required
Required
Required
Required
5.24
4
7.88
4
10.5
4.75
13.33
4.75
4
5
7
10
1
2
3
Descripition of Transformer
KVA of Transformer
KW of TR. at P.F -0.8
Full load current of TR.
Capacity
315
252
433
Details of accessories to
run the transformer
4 Size of cable 3-core
H.T.side ( Aluminium ) in mm2
35
5 Size of cable 3 1/2 core
L.T. side(Aluminium ) in mm2 2X240 sqmm
Metering panel with C.T./P.T
6 unit
20/5 A/110 V
Trivector meter as per TR.
7 rating
20/5 A/110 V
HT VCB/SF-6 panel with HT
8 metering
As per TR. Rating.
Required
G.O.switch
with
all
9 accessories I/C D.O.fuse ,
lighting arrestor and stay wire
set, earthing etc.
Required
HT current of TR.- on HT side
10 (Amp.)
16.8
11 Impedance %
4.75
Capocitor for TR (KVAR) only
12 for TR losses
12.5
400
320
530
500
400
687
630
604
866
50
50
50
2X240 sqmm
3X240 sqmm
3X240 sqmm
25/5 A/110 V
30/5 A/110 V
50/5 A/110 V
25/5 A/110 V
30/5 A/110 V
50/5 A/110 V
Required
Required
Required
Required
Required
Required
21.33
4.75
26.66
4.75
40.26
5
20
25
30
Descripition of
Transformer
1 KVA of Transformer
2 KW of TR. at P.F -0.8
3 Full load current of TR.
Details of accessories to
run the transformer
4 Size of cable 3-core
H.T.side ( Aluminium ) in
mm2
800
640
1100
1000
800
1375
Capacity
1250
1000
1718
1600
1280
2199
2000
1600
2740
70
70
95
125
125
Bus duct 1200 Bus duct 1600 Bus duct 2000 Bus duct 2500 Bus duct 4000
A
A
A
A
A
5 Size of cable 3 1/2 core
L.T. side(Aluminium ) in
3X400 sqmm 4X400 sqmm
N/A
N/A
N/A
mm2
Metering panel with C.T./P.T
6 unit
50/5 A/110 V 60/5 A/110 V 70/5 A/110 V 100/5 A/110 V 125/5 A/110 V
Trivector meter as per TR.
7 rating
50/5 A/110 V 60/5 A/110 V 70/5 A/110 V 100/5 A/110 V 125/5 A/110 V
HT VCB/SF-6 panel with
8 HT metering
As per TR. Rating.
Required
Required
Required
Required
Required
G.O.switch
with
all
9 accessories I/C D.O.fuse ,
lighting arrestor and stay
wire set, earthing etc.
Required
Required
Required
Required
Required
HT current of TR.- on HT
10 side (Amp.)
42.66
53.33
66.66
85.33
106.66
11 Impedance %
5
5
5
6.25
6.25
Capocitor for TR (KVAR)
12 only for TR losses
35
50
50
75
100
NOTE :a)
HT VCB / SF-6 as incomer of Transformer on HT side ( and required as per
Electricity Board norms )
b)
CT ratio 50/25/5 A ( if load vary from 25 amp. To 50 amp after expansion on HT
side of Transformer
c)
CT ratio - 30/30/5 amp. ( separate for metering and separate for protection.)
d)
Calculation of HT current of Transformer = Kva / 11 kv / 1.73.
e)
PT- 110 /220 volt AC.( as per requirement )
Detail of D.G.Sets with details
1
KVA
5
7.5
10
15
15
20
25
30
30
40
50
2
KW
4
6
8
12
12
16
20
24
24
32
40
3
62.5 62.5
50
50
AMPS 6.95 10.4 13.9 20.8 20.8 27.8 34.75 41.7 41.7 55.6 69.5 86.9 86.9
4
BHP
7
10
12
18.7
1
KVA
100
125
160
2
KW
80
100
128
3
AMPS
139
4
BHP
127
173.7 222.4
154
205
19
65
76
83
75
82.5
60
66
104
114.6
105
105
28
32
38
43
50.5
180
200
250
320
380
437
500
625
750
1000
144
160
200
256
304
350
400
500
600
800
250
278
348
445
528
608
614
868.8
1043
1390
231
255
306
380
450
530
614
750
890
1180
Detail of DIRECT ON LINE ( DOL ) starter with all type of possible
accessories
S.No.
1
2
3
4
5
6
7
8
9
10
11
DESCREPTION OF MOTOR
HP-3Phase 415 V AC
0.5
0.75
1
KW of Motor
0.37
0.55
0.75
Full load current of Motor
in amp.
1.2
1.6
1.8
EQUIPMENT TO START THE MOTOR BELOW FOR EACH MOTOR
MPCB as incomer. In amp.
MPCB
MPCB
MPCB
1-1.6 A
1-1.6 A
1.6-2.5 A
Contactor rating in amp.
1x9 amp
1x9 amp
1x9 amp
Single phase preventor 415 v
AC.
A/P/R
A/P/R
A/P/R
Control MCB SP.( single pole
)
6 amp SP
6 amp SP
6 amp SP
Push Botton ( START &
STOP ) 1 NO+1 NC
2-Nos
2-Nos
2-Nos
On Indication ( LED 220 V
AC )
1-Nos
1-Nos
1-Nos
Cable for supply side 3 1/2
core COPPER
1.5 sq mm
1.5 sq mm
1.5 sq mm
Cable for Motor side 3-core
COPPER.
1.5 sq mm
1.5 sq mm
1.5 sq mm
1.5
1.1
2.6
MPCB
2.5-4 A
1x9 amp
A/P/R
6 amp SP
2-Nos
1-Nos
1.5 sq mm
1.5 sq mm
Detail of DIRECT ON LINE ( DOL ) starter with all type of possible
accessories
S.No DESCREPTION OF
. MOTOR
1 HP-3Phase 415 V AC
2
3
5
7.5
2 KW of Motor
1.5
2.25
3.75
5.5
3 Full load current of
Motor in amp.
3.5
5
7.5
11
EQUIPMENT TO START THE MOTOR BELOW FOR EACH MOTOR
4 MPCB as incomer. In
amp.
MPCB
MPCB
MPCB
MPCB
2.5-4 A
4-6.3 A
6-10 A
9-15 A
5 Contactor rating in amp.
1x9 amp
1x9 amp
1x12 amp
1x18 amp
6 Single phase preventor
415 v AC.
A/P/R
A/P/R
A/P/R
A/P/R
7 Control MCB SP.( single
pole )
6 amp SP
6 amp SP
6 amp SP
6 amp SP
8 Push Botton ( START &
STOP ) 1 NO+1 NC
2-Nos
2-Nos
2-Nos
2-Nos
9 On Indication ( LED 220
V AC )
1-Nos
1-Nos
1-Nos
1-Nos
10 Cable for supply side 3
1/2 core COPPER
2.5 sq mm
2.5 sq mm
2.5 sq mm
4 sq mm
11 Cable for Motor side 3core COPPER.
2.5 sq mm
2.5 sq mm
2.5 sq mm
4 sq mm
Single phase preventor 415 v AC = A/P/R ( AS PER REQUIRMENT )
10
7.5
14
MPCB
9-15 A
1x25 amp
A/P/R
6 amp SP
2-Nos
1-Nos
4 sq mm
4 sq mm
Detail of STAR/DELTA starter with all type of possible accessories
DESCREPTION OF
S.No. MOTOR
1 HP-3Phase 415 V AC
15
20
25
2 KW of Motor
11
15
18.5
Full load Line current of
3 Motor in amp.
21
28
35
Phase current of Motor in
4 amp.
12
16
20
EQUIPMENT TO START THE MOTOR BELOW FOR EACH MOTOR
MPCB/MCCB as incomer.
5 In amp.
MPCB
MPCB
MCCB
19-25 A
24-32 A
63 A
6 Contactor rating in amp.
3x25 amp
3x32 amp
3x32 amp
7 Motor protection relay -MPR Not-req
Not-req
MPR
( 2.5-5 A )
8 Timers
0-60 sec
0-60 sec
0-60 sec
Single phase preventor 415
9 v AC.
A/P/R
A/P/R
A/P/R
10 Control MCB SP.
6 amp SP
6 amp SP
6 amp SP
11 Amp. Meter
0-50 amp
0-50 amp
0-50 amp
12 CT,s ( -/5 amp )
50/5 amp
50/5 amp
50/5 amp
Cable for supply side 3 1/2
13 core ALUMINIUM
10 sq mm
10 sq mm
16 sq mm
Cable for Motor side 3-core
14 ALUMINIUM.
2x6 sq mm 2x6 sq mm
2x10 sq mm
30
22
35
26
40
47
23
27
MCCB
100 A
3x40 amp
MPR
( 2.5-5 A )
0-60 sec
MCCB
100 A
3x40 amp
MPR
( 2.5-5 A )
0-60 sec
A/P/R
6 amp SP
0-50 amp
50/5 amp
A/P/R
6 amp SP
0-75 amp
75/5 amp
16 sq mm
25 sq mm
2x10 sq mm
2x16 sq mm
Detail of STAR/DELTA starter with all type of possible accessories
DESCREPTION OF
S.No. MOTOR
1 HP-3Phase 415 V AC
2 KW of Motor
Full load line current of
3 Motor in amp.
Phase current of Motor in
4 amp.
5
6
7
8
9
10
11
12
13
14
40
30
50
37
60
45
75
56
90
67.5
55
66
80
100
120
30
35
45
57
69
MCCB
160 A
3x80 amp
MPR
( 2.5-5 A )
0-60 sec
MCCB
200 A
3x110amp
MPR
( 2.5-5 A )
0-60 sec
A/P/R
6 amp SP
0-150 amp
150/5 amp
A/P/R
6 amp SP
0-150 amp
150/5 amp
70 sq mm
70 sq mm
2x25 sq mm
2x50 sq mm
EQUIPMENT TO START THE MOTOR BELOW FOR EACH MOTOR
MPCB/MCCB as incomer.
In amp.
MCCB
MCCB
MCCB
100 A
100 A
125 A
Contactor rating in amp.
3x40 amp
3x50 amp
3x70 amp
Motor protection relay -MPR
MPR
MPR
MPR
( 2.5-5 A )
( 2.5-5 A )
( 2.5-5 A )
Timers
0-60 sec
0-60 sec
0-60 sec
Single phase preventor 415
v AC.
A/P/R
A/P/R
A/P/R
Control MCB SP.
6 amp SP
6 amp SP
6 amp SP
Amp. Meter
0-75 amp 0-100 amp
0-100 amp
CT,s ( -/5 amp )
75/5 amp 100/5 amp
100/5 amp
Cable for supply side 3 1/2
core ALUMINIUM
25 sq mm
35 sq mm
50 sq mm
Cable for Motor side 3-core
ALUMINIUM.
2x16 sq mm 2x16 sq mm 2x25 sq mm
Detail of STAR/DELTA starter with all type of possible accessories
DISCREPTION OF
S.No. MOTOR
1 HP-3Phase 415 V AC
100
125
150
175
2 KW of Motor
75
90
112
132
Full load line current
3 of Motor in amp.
135
165
200
230
Phase current of Motor
4 in amp.
78
95
115
133
EQUIPMENT TO START THE MOTOR BELOW FOR EACH MOTOR
MPCB/MCCB as
5 incomer. In amp.
MCCB
MCCB
MCCB
MCCB
250 A
250 A
400 A
400 A
6 Contactor rating in amp. 3x110amp 3x140amp 3x140amp
3x200amp
Motor protection relay 7 MPR
MPR
MPR
MPR
MPR
( 2.5-5 A ) ( 2.5-5 A )
( 2.5-5 A )
( 2.5-5 A )
8 Timers
0-60 sec 0-60 sec
0-60 sec
0-60 sec
Single phase preventor
9 415 v AC.
A/P/R
A/P/R
A/P/R
A/P/R
10 Control MCB SP.
6 amp SP 6 amp SP
6 amp SP
6 amp SP
11 Amp. Meter
0-150 amp 0-250 amp 0-250 amp
0-250 amp
12 CT,s ( -/5 amp )
150/5 amp 250/5 amp 250/5 amp
250/5 amp
Cable for supply side 3
13 1/2 core ALUMINIUM
95 sq mm 120 sq mm 240 sq mm
240 sq mm
Cable for Motor side 32x50 sq
2x70 sq
14 core ALUMINIUM.
mm
mm
2x95 sq mm 2x95 sq mm
200
150
250
187
275
323
159
185
MCCB
400 A
3x200amp
MCCB
630A
3x265amp
MPR
( 2.5-5 A )
0-60 sec
MPR
( 2.5-5 A )
0-60 sec
A/P/R
6 amp SP
0-400 amp
400/5 amp
2x120 sq
mm
2x120 sq
mm
A/P/R
6 amp SP
0-400 amp
400/5 amp
2x150 sq
mm
2x185 sq
mm
IMPORTANT - ALL THE POWER CONNECTION OF STARTER IN SIDE THE PANEL WITH SOLID BUS BARS 50 HP AND ABOVE.
VIDEO ON STAR - DELTA STARTER
500
160KVA
Power of the transformer
250KVA
KVA
48.0 KA =Icc downstream
the transformer
400KVA
630KVA
Maine line (Alu or Copper)
800KVA
a=alu (cu by default)
a
Lenght
5
m
Cross section
800
mm²
1000KVA
1250KVA
1600KVA
45.3KA
2000KVA
2500KVA
Secundary level (Alu or Copper)
a=alu (cu by default)
Lenght
Cross section
third level (Alu or Copper)
a=alu (cu by default)
Lenght
Cross section
a
10
240
33.1
m
mm²
KA
20
1.5
m
mm²
Icc3
=
0.75
KA
Icc1
=
0.60
KA
Thank You