UPS and Battery Sizing Calculation

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

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CONTENTS

1 PURPOSE............................................................................................................3 2 STANDARDS AND CODES..............................................................................3 2.1. Standard and code.......................................................................................3 2.2. Calculation condition...................................................................................3 2.3. Calculation data...........................................................................................3 2.4. Abbreviations..............................................................................................3 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

CALCULATION

1

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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

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LPG REFRIGERATED STORAGE PROJECT

091135-PVG-EC-004

CALCULATION

3

CALCULATION

3.1.

Calculation due to normal loads (P0)

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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] S: Load demand in KVA (S = 20 kVA) PVC-DEC CONSORTIUM

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CALCULATION

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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

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LPG REFRIGERATED STORAGE PROJECT

091135-PVG-EC-004

CALCULATION

Service Description

Rated voltage V

High voltage switchgear (Control circuit No.1) High voltage switchgear (Control circuit No.2) Low voltage switchboard (Control circuit No.1) Low voltage switchboard (Control circuit No.2) GCB Lighting Panel for Flare - DCS -F&G - Operation - Printers (2 units) - Telecommunication system - Paging system - LAN network - CCTV system - Tank gauging Control Panel 1 (Computer). - Tank gauging Control Panel 2 (Computer). - Flow computer control panel No.1 - Flow computer control panel No.2 - Analyser TOTAL LOAD

230 230 230 230 230 230 230 230 230 230 230 230 230 230 230 230 230 230 230 230

Power cons.

Power factor running

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Ef

(KW)

(cosϕ)

0.50 0.50 1.10 1.10 0.10 1.60

0.85 0.85 0.85 0.85 0.85 0.85

0.90 0.90 0.90 0.90 0.90 0.90

1.30 1.10 1.70 1.60 0.20 0.60 0.30 1.10 0.30 0.30 0.30 0.30 0.30

0.85 0.85 0.85 0.85 0.85 0.85 0.85 0.85 0.85 0.85 0.85 0.85 0.85

0.90 0.90 0.90 0.90 0.90 0.90 0.90 0.90 0.90 0.90 0.90 0.90 0.90

14.30

Load type

Duty

Absor. Power

C/I/S

kW

F F F F F F

C C C C C C

F F F F F F F F F F F F F

C C C C C C C C C C C C C

0.48 0.48 1.05 1.05 0.10 1.52 1.24 1.05 1.62 1.52 0.19 0.57 0.29 1.05 0.29 0.29 0.29 0.29 0.29

Load factor

C (Continuous) P

Q

kW

kVAr

0.95 0.95 0.95 0.95 0.95 0.95

0.53 0.53 1.16 1.16 0.11 1.69

0.33 0.33 0.72 0.72 0.07 1.05

0.95 0.95 0.95 0.95 0.95 0.95 0.95 0.95 0.95 0.95 0.95 0.95 0.95

1.37 1.16 1.79 1.69 0.21 0.63 0.32 1.16 0.32 0.32 0.32 0.32 0.32

0.85 0.72 1.11 1.05 0.13 0.39 0.20 0.72 0.20 0.20 0.20 0.20 0.20

15.09

9.35

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CALCULATION

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