single line diagram (sld) or, one line diagram · single line diagram (sld) or, one line diagram...
TRANSCRIPT
SINGLE LINE DIAGRAM (SLD) Or, ONE LINE DIAGRAM Date: drafted 11th January 2015 WHY IT’S REQUIRED? Whether you have a new or existing facility, the single-line diagram is the vital roadmap for all future testing, service and maintenance activities. As such, the single-line diagram is like a balance sheet for your facility and provides a snapshot of your facility at a moment in time. It needs to change as your facility changes to ensure that your systems are adequately protected. To make all the changes documented in a common file, making the electrical system easily understandable for any technical person inside/outside of the factory. An up-to-date single-line diagram is vital for a variety of service activities including:
• Short circuit calculations • Coordination studies • Load flow studies • Safety evaluation studies • All other engineering studies • Electrical safety procedures • Efficient maintenance
WHAT SHOULD BE IN A SINGLE LINE DIAGRAM (SLD)? A typical package of single line diagram shall include:
• Incoming lines showing voltage and size • Incoming main fuses, cutouts, switches, and main/tie breakers • Power transformers (rating, winding connection and grounding means) • Feeder breakers and fused switches rating and type. • Relays (function, use and type) • Current and / or potential transformers with size, type and ratio • Control transformers rating. • All main cable and wire runs with their associated isolating switches • All substations, including integral relays and main panels with total load of each feeder and
each substation • Critical equipment voltage and size (UPS, battery, generator, power distribution, transfer
switch, computer room air conditioning) • A summary load schedule for the LT switchgear panel. • A load schedule for each distribution panels and switch board. • Rating and dimension of bus bar. • All outgoing cables with cable size and type with rating and type of their associated isolating
switches (e.g. circuit breaker). • Length and voltage drop of all outgoing cables. • Rating of PFI , changeover, ATS, generators with associated protection and isolating switch • All earthing cable rating (size, type etc.) • All connected load with their individual load capacity. • All spare switches (outgoing circuit breaker) shall be mentioned. • Earthing system must be included with dimension of earthing pit, boring, earth electrode size,
earth lead and ECC cable size and type. Here is given an example of a typical LT panel one line diagram or Single line diagram (try to follow it as best as possible).
PROJ
ECT
NAME
:
DRAW
ING
TITL
E:
Revis
ions
Date
NoDe
scrip
tions
Scale
:Da
te:
LOAD
SCH
EDU
LE &
SIN
GLE
LIN
E D
IAG
RAM
OF
SM
DB-S
(SEC
ON
D F
LOO
R)
MEP
CONS
ULTA
NT:
Note
:
x x x x
R=49
.330
KW
Y=49
.340
KW
B=49
.330
KW
TL=1
48.0
00 K
WDL
=103
.600
KW
(70%
)
PROJ
ECT
NAME
:
DRAW
ING
TITL
E:
Revis
ions
Date
NoDe
scrip
tions
Scale
:Da
te:
SIN
GLE
LIN
E D
IAG
RAM
OF
SM
DB-F
OF
FIRST
FLO
OR
MEP
CONS
ULTA
NT:
Note
:
x x x x
R=49
.340
KW
Y=49
.330
KW
B=49
.330
KW
TL=1
48.0
00 K
WDL
=103
.600
KW
(70%
)
PROJ
ECT
NAME
:
DRAW
ING
TITL
E:
Revis
ions
Date
NoDe
scrip
tions
Scale
:Da
te:
SIN
GLE
LIN
E D
IAG
RAM
OF
SM
DB-T
OF
THIR
D F
LOO
R
MEP
CONS
ULTA
NT:
Note
:
x x x x
R=19
.720
KW
Y=19
.720
KW
B=19
.720
KW
TL=5
9.16
0 KW
DL=4
1.41
2 KW
(70%
)
PROJ
ECT
NAME
:
DRAW
ING
TITL
E:
Revis
ions
Date
NoDe
scrip
tions
Scale
:Da
te:
LOAD
SCH
EDU
LE &
SIN
GLE
LIN
E D
IAG
RAM
OF
SM
DB-F
r. (
FOU
RTH
FLO
OR)
MEP
CONS
ULTA
NT:
Note
:
x x x x
R=49
.330
KW
Y=49
.330
KW
B=49
.340
KW
TL=1
48.0
00 K
WDL
=103
.600
KW
(70%
)
PROJ
ECT
NAME
:
DRAW
ING
TITL
E:
Revis
ions
Date
NoDe
scrip
tions
Scale
:Da
te:
LOAD
SCH
EDU
LE &
SIN
GLE
LIN
E D
IAG
RAM
OF
SM
DB-F
f. (
FIFT
H F
LOO
R)
MEP
CONS
ULTA
NT:
Note
:
x x x x
R=49
.340
KW
Y=49
.330
KW
B=49
.330
KW
TL=1
48.0
00 K
WDL
=103
.600
KW
(70%
)
M
2x1c
,120
.0 m
m2
Cu.
R=27
3.46
5 KW
Y=27
3.22
0 KW
B=27
2.44
5 KW
TL=8
19.1
30 K
W
R=55
.296
KW
Y=55
.060
KW
B=54
.275
KW
TL=1
64.6
30 K
W
PROJ
ECT
NAME
:
DRAW
ING
TITL
E:
Revis
ions
Date
NoDe
scrip
tions
Scale
:Da
te:
LOAD
SCH
EDU
LE &
SIN
GLE
LIN
E D
IAG
RAM
OF
LT P
AN
EL
MEP
CONS
ULTA
NT:
Note
:
x x x x
R=98
.670
KW
Y=98
.670
KW
B=98
.660
KW
TL=2
96.0
00 K
W
R=98
.670
KW
Y=98
.660
KW
B=98
.670
KW
TL=2
96.0
00 K
W
PROJ
ECT
NAME
:
DRAW
ING
TITL
E:
Revis
ions
Date
NoDe
scrip
tions
Scale
:Da
te:
ELEC
TRIC
AL
LOAD
SCH
EDU
LE &
SIN
GLE
LIN
E D
IAG
RAM
OF
DB-R
(RO
OF
FLO
OR)
MEP
CONS
ULTA
NT:
Note
:
x x x x
BY
RPH
AS
E L
OA
D IN
KW
PO
INT
PE
RW
ATT
PO
INTS
NO
. OF
PO
INT
RE
FER
AN
CE
SIZ
EN
UTR
AL
PH
AS
E
RA
TM
CB
RE
F.C
KT
B3
Y3
R3
B2
Y2
R2
B1
Y1
R1
TOTA
L C
ON
NE
CTE
D L
OA
D 8
.015
KW
DS
13--
DS
18
0.51
0D
S7-
-DS
12
DS
19--
DS
24
10A
SP
DB R
EF. :
DB-
R | F
ED F
ROM
: RY
B9/M
DB-1
| LO
CATI
ON
: CAN
TEEN
(RO
OF
FLO
OR)
RE
F.M
CC
B 20A TP MCB MAIN
2.46
0TO
TAL
PH
AS
E L
OA
D3.
260
2.29
5
(rm
)S
IZE
EA
RTH
(re)
LOC
ATI
ON
2X2.
51X
2.5
DS
1--D
S6
CA
NTE
EN
60.
510
85A
mp
0.51
0
6 6
85 85
TOTA
L D
IVE
RS
IFIE
D L
OA
D (7
0%) 5
.610
KW
06W
AY (T
P) 2
0A T
P M
CB
MAI
N |
CAB
LE S
IZE
: 1X4
c,6.
0mm
2 N
YY/P
VC+1
X1c,
6.0m
m2
PVC
S/C
EC
C
CA
NTE
EN
TOIL
ETS
10A
SP
10A
SP
10A
SP
10A
SP
10A
SP
10A
SP
10A
SP
10A
SP
B4
Y4
R4
STA
IR L
OB
BY
10A
SP
10A
SP
10A
SP
2X2.
51X
2.5
2X2.
51X
2.5
2X2.
51X
2.5
2X2.
51X
2.5
2X2.
51X
2.5
2X2.
51X
2.5
2X2.
51X
2.5
2X2.
51X
1.5
DS
25--
DS
30
DS
31--
DS
36
DS
37--
DS
42
DS
43--
DS
48
L1--
L6+E
XF1
--E
XF2
L12-
-L19
+F1-
-F3
L20-
-L27
+F4-
-F6
L7--
L11
685
6 6
85 85
685
6 6+2
85
25/1
00
8+3
40/7
0
8+3 5
40/7
0
25
0.51
0
0.51
0
0.51
0
0.51
0
0.51
0
0.35
0
0.53
0
0.53
0
0.12
5
B5
Y5
R5
CA
NTE
EN
20A
SP
20A
SP
20A
SP
2X4.
01X
4.0
2X4.
01X
4.0
2X4.
01X
4.0
S1-
-S2
(RA
DIA
L)
S3-
-S4
(RA
DIA
L)
S5-
-S8
(RA
DIA
L)
220
0
2 4
200
200
0.40
0
0.40
0
0.80
0
B6
Y6
R6
SP
AR
E
S9-
-S12
(RA
DIA
L)
SP
AR
E
M.P
RA
YE
R R
OO
M
F.P
RA
YE
R R
OO
M
2X2.
51X
2.5
2X2.
51X
2.5
2X2.
51X
2.5
CA
NTE
EN
CA
NTE
EN
CA
NTE
EN
CA
NTE
EN
CA
NTE
EN
CA
NTE
EN
F.P
RA
YE
R R
OO
M
M.P
RA
YE
R R
OO
M
20A
SP
2X
4.0
1X4.
0
20A
SP
-
-
10A
SP
-
-
--
4 -20
0 -0.
800
-
-
TP
MCB20A
DB-R
6WA
Y
TL=
8.01
5 KW
B=2.
295
KWY=
3.26
0 KW
FED
FROM
RYB
9/M
DB-1
6WAY
, 20A
TPN
+E
COPP
ER B
US B
AR
R=2.
460
KW
10A
MCBSP
10A
MCBSP
10A
MCBSP
10A
MCBSP
10A
MCBSP
10A
MCBSP
10A
MCBSP
10A
MCBSP
10A
MCBSP
10A
MCBSP
10A
MCBSP
10A
MCBSP
DS1--DS6
DS7--DS12
DS13--D18
DS19--DS24
DS25--DS30
DS31--DS36
DS37--DS42
DS43--DS48
L1--L6+EXF1--EXF2
L7--L11
L20--L27+F4--F6
L12--L19+F1--F3DL=
5.61
0 KW
(70%
)
+1X1
c,6.0
mm
2 PV
C S/
C EC
C
1X4c
,6.0
mm
2 NY
Y/PV
C
20A
MCBSP
20A
MCBSP
20A
MCBSP
S5--S8 (RADIAL)
S3--S4 (RADIAL)
S1--S2 (RADIAL)
SPARE
S9--S12 (RADIAL)
SPARE20A
MCBSP
20A
MCBSP
10A
MCBSP
1x1c
ECC
240
mm
2 BYA
/NYY
(or
10-1
2 m
m d
ia b
are
copp
er w
ire
1x4c
240 m
m2 BYA
/NYY
1x1c
ECC
240
mm
2 BYA
/NYY
(or
10-1
2 m
m d
ia b
are
copp
er w
ire
1x1c
ECC
240
mm
2 BYA
/NYY
(or
10-1
2 m
m d
ia b
are
copp
er w
ire
600
A (a
djus
tabl
e)M
CCB