091135-PVG-EC-004
CALCULATION
PAGE: COVER
TITLE : UPS SYSTEM CALCULATION
PROJECT NAME
: LPG REFRIGERATED STORAGE
CLIENT
: PETROVIETNAM GAS CORPORATION
DEC PROJECT NO. : 090366
REV. NO.
REV. NO.
DATE
PREPARATION
DEPT.
DESCRIPTION
PREPARATION
PREP'N
REVIEW
REVIEW
DEC APPROVAL
DEC
PVGAS
APPROVAL APPROVAL
PVGAS APPROVAL
NGOC N.T
A
PVE-EL
30 Oct 2010
This document is the property of Daewoo Engineering Company. Therefore, it shall not be released to any third party without
permission of authorized person of Daewoo Engineering Company.
LPG REFRIGERATED STORAGE PROJECT
091135-PVG-EC-004
CALCULATION
PAGE: 2 of 7
CONTENTS
1
PURPOSE ......................................................................................................... 3
2
STANDARDS AND CODES .......................................................................... 3
3
2.1.
Standard and code ..................................................................................... 3
2.2.
Calculation condition ................................................................................ 3
2.3.
Calculation data ......................................................................................... 3
2.4.
Abbreviations ............................................................................................ 3
CALCULATION .............................................................................................. 4
3.1.
Calculation due to normal loads (P0) ........................................................ 4
3.2.
UPS capacity selected (P) ......................................................................... 4
3.3.
Capacity of Battery (AH/4HR) ................................................................. 4
PVC-DEC CONSORTIUM
LPG REFRIGERATED STORAGE PROJECT
091135-PVG-EC-004
PAGE: 3 of 7
CALCULATION
1
PURPOSE
This calculation is provided to determine the rating of the UPS to supply
the critical loads for electrical system for the LPG REFRIGERATED
STORAGE PROJECT at BA RIA – VUNG TAU, VIETNAM.
2
STANDARDS AND CODES
2.1.
Standard and code
2.2.
-
IEEE 485 - 1997, Recommended Practice for Sizing Lead-Acid
Batteries for Stationary Applications
-
IEC60896: Stationary lead-acid batteries.
-
Other relevant standards.
Calculation condition
Input & Output of UPS shall be as follows.
2.3.
-
AC input
: 3 ph, 4 wires, 50 Hz, 400 VAC
-
DC Input
: supplied from Batteries with Back-up time: 4 hour
-
AC output
: 1 ph, 3 wires (2 + E), 50 Hz, 110 VAC
Calculation data
UPS loads, Refer to the following documents:
2.4.
-
Appendix 1 “Instrument loads Estimation”
-
Attachment - UPS load analysis
Abbreviations
UPS
Uninterruptable Power Supply
AC
Alternative Current
DC
Direct Current
VAC
Voltage of Alternative Current
kVA
Kilo-Volt-Ampere
PVC-DEC CONSORTIUM
LPG REFRIGERATED STORAGE PROJECT
091135-PVG-EC-004
PAGE: 4 of 7
CALCULATION
3
CALCULATION
3.1.
Calculation due to normal loads (P0)
UPS capacity P ≥ P0
Normal loads:
-
P0 = 15.09 kVA
-
Q0 = 9.35 kVAr
(Refer to “Attachment - UPS load Analysis”, this value considered to the
efficiency of loads.)
3.2.
UPS capacity selected (P)
Current wave height is higher than normal wave height because of the
harmonic currents generated by rectifier loads
Therefore:
Design contingency Capacity allowance of 10 % is considered.
UPS Capacity
-
P = 15.09 kW x 1.1 = 16.6 kW
-
Q = 9.35kVAr x 1.1 = 10.29kVAr
-
S = 19.53kVA
From the above calculation, 20 kVA of UPS would be selected
3.3.
Capacity of Battery (AH/4HR)
Capacity of Battery Bank required:
C = Idc x K x L
Where:
-
Idc: Discharge current of Battery bank in ( A )
I DC [A] = 1.2 x (S [kVA] x 1000) / UDC [V]
PVC-DEC CONSORTIUM
LPG REFRIGERATED STORAGE PROJECT
091135-PVG-EC-004
PAGE: 5 of 7
CALCULATION
S: Load demand in KVA (S = 20 kVA)
UDC: Average discharge voltage of battery bank in (V)
UDC = 0.86 x Ubat = 0.86 x 110 = 95 V DC
Value 1.2 expressed 20% margin
IDC= 1.2 x (20 x 1000) / 95 = 252.6 A
-
K: Battery back-up time required (HR), (4 HR )
-
L: Aging factor, ( 1.25 )
C = 252.6 x 4 x 1.25 = 1263 AH / 4HR
Capacity of Battery bank shall be 1263 AH / 4 HR
PVC-DEC CONSORTIUM
LPG REFRIGERATED STORAGE PROJECT
091135-PVG-EC-004
PAGE: 6 of 7
CALCULATION
Service Description
Rated
voltage
V
230
Power
cons.
Power
factor
running
(KW)
(cos)
Ef
Load
type
Duty
Absor.
Power
C/I/S
kW
Load
factor
C (Continuous)
P
Q
kW
kVAr
0.50
0.85
0.90
F
C
0.48
0.95
0.53
0.33
High voltage switchgear (Control circuit No.2)
230
0.50
0.85
0.90
F
C
0.48
0.95
0.53
0.33
Low voltage switchboard (Control circuit No.1)
230
1.10
0.85
0.90
F
C
1.05
0.95
1.16
0.72
Low voltage switchboard (Control circuit No.2)
230
1.10
0.85
0.90
F
C
1.05
0.95
1.16
0.72
GCB
230
0.10
0.85
0.90
F
C
0.10
0.95
0.11
0.07
Lighting Panel for Flare
230
1.60
0.85
0.90
F
C
1.52
0.95
1.69
1.05
High voltage switchgear (Control circuit No.1)
230
-
- DCS
230
1.30
0.85
0.90
F
C
1.24
0.95
1.37
0.85
-F&G
230
1.10
0.85
0.90
F
C
1.05
0.95
1.16
0.72
- Operation
230
1.70
0.85
0.90
F
C
1.62
0.95
1.79
1.11
- Printers (2 units)
230
1.60
0.85
0.90
F
C
1.52
0.95
1.69
1.05
- Telecommunication system
230
0.20
0.85
0.90
F
C
0.19
0.95
0.21
0.13
- Paging system
230
0.60
0.85
0.90
F
C
0.57
0.95
0.63
0.39
- LAN network
230
0.30
0.85
0.90
F
C
0.29
0.95
0.32
0.20
- CCTV system
230
1.10
0.85
0.90
F
C
1.05
0.95
1.16
0.72
- Tank gauging Control Panel 1 (Computer).
230
0.30
0.85
0.90
F
C
0.29
0.95
0.32
0.20
- Tank gauging Control Panel 2 (Computer).
230
0.30
0.85
0.90
F
C
0.29
0.95
0.32
0.20
- Flow computer control panel No.1
230
0.30
0.85
0.90
F
C
0.29
0.95
0.32
0.20
- Flow computer control panel No.2
230
0.30
0.85
0.90
F
C
0.29
0.95
0.32
0.20
PVC-DEC CONSORTIUM
LPG REFRIGERATED STORAGE PROJECT
091135-PVG-EC-004
PAGE: 7 of 7
CALCULATION
Service Description
- Analyser
TOTAL LOAD
Rated
voltage
Power
cons.
Power
factor
running
V
(KW)
(cos)
230
0.30
0.85
14.30
Ef
0.90
Load
type
F
Duty
Absor.
Power
C/I/S
kW
C
0.29
Load
factor
0.95
C (Continuous)
P
Q
kW
kVAr
0.32
0.20
15.09
9.35
PVC-DEC CONSORTIUM