Arar Ups Sizing

TCE CONSULTING ENGINEERS LIMITED 30421007-3CL-00020-

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UPS SIZING

SAUDI ELECTRICITY COMPANY EASTERN OPERATING AREA Dammam, Saudi Arabia GENERATION EXPANSION OF ARAR POWER PLANT (CONTRACT NO : 30421007/00) DESIGN BASIS REPORT FOR UPS SIZING

DOCUMENT NO. : 30421007-3CL-00020-P0A SEPTEMBER, 2004

ENGINEERING CONSULTANT TCE CONSULTING ENGINEERS LIMITED 73/1, ST. MARK’S ROAD BANGALORE 560 001 INDIA

CONTRACTOR: AL-TOUKHI COMPANY FOR INDUSTRY & TRADING P.O. BOX 497, RIYADH 11411, KINGDOM OF SAUDI ARABIA TEL. 00966-1-4633660 : FAX. 00966-1-4631150

P0A 11.10.2004

MP

SR

REV NO . DATE

PREPARED BY

CHECKED BY

CLEARED BY

APPROVED BY TCE FORM 032 R1

TCE CONSULTING ENGINEERS LIMITED 30421007-3CL-00020-

UPS SIZING

CONTENTS SHEET 1 of 5 OF 4

CONTENTS

CLAUSE No.

DESCRIPTION

PAGE No.

1.0

Introduction

1

2.0

Reference Documents

2

3.0

Design Basis

3

4.0

UPS Sizing

4

5.0

Conclusion

4

ANNEXURES 6.0

Annexure-1-UPS SIZING CALCULATION

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UPS SIZING

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INTRODUCTION:

1.1

Al-Toukhi company for Industry & Trading has been awarded turnkey contract for Open Cycle Gas Turbine based CPS expansion project at Arar of Saudi Electric Company-Eastern Operation Area (SEC-EOA), Saudi Arabia.

1.2

The project consists of design, engineering, procurement, installation, testing and commissioning of two (2) Nos. 60.16MW @ 50C, PG7121 (EA) model Gas Turbine Generator unit of GE make along with associated Generator Transformer and other balance of plant electro-mechanical equipment.

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UPS SIZING

2.0

REFERENCE DOCUMENTS

2.1

Scope of Work and Technical Specifications & Data Schedule of PTS-1022.

2.2

SCECO Engineering Standards SES-P-103.05.

2.3

SCECO MATERIAL 46-SMSS-3, REV.2

STATNDARD

SPECIFICATION

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UPS SIZING

DESIGN BASIS The UPS system configuration shall be capable of being operated in “Redundant Mode” as specified in CLNo:4.2 of Data schedule for “Power Supply Uninterruptible” , page 31 of 40 of PTS-1022. In Redundant Mode, where each UPS modules (charger, inverter and static switch assembly) shall be sized to independently carry the full AC critical load. Under normal operating conditions, only one of the UPS unit shall be operating and carrying 100% load whereas the other unit shall be in standby mode. The failure of the operating UPS unit shall cause the standby UPS unit to carry 100% of the critical load and disconnect the inoperative module/unit from the critical load, which upon repair shall resume standby operation. In the event of failure of the second operating system, carrying 100% load, when one system is already off-the line, the load shall be transferred automatically, uninterrupted to the alternate source (bypass) The Redundant UPS system configuration would be as per FIG-2, page 40 of 40 of 46-SMSS-3, Rev-2

3.2

The rated Input and Output characteristic of the UPS will be as follow, as per CLNo:4.3 of Data schedule for “Power Supply Uninterruptible” , page 31 & 32 of 40 of PTS-1022. UPS Input characteristic: a) b) c) d)

Rated input Voltage(Vac) No of Phases No of wires Frequency

: : : :

480V 3 4 60 Hz

: : : :

127V 1 2 60 Hz

UPS Output characteristic: a) b) c) d)

Rated output Voltage(Vac) No of Phases No of wires Frequency

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The Battery charger/rectifier rated input /output voltages are as follows, as per CLNo:4.3 of Data schedule for “Power Supply Uninterruptible” , page 35 of 40 of PTS-1022. a) b)

Input Voltage(Vac) Output Voltage

: :

480V 125V DC

3.4

As specified in CLNo:4.3 of Data schedule for “Power Supply Uninterruptible” , page 35 of 40 of PTS-1022, 125V DC “ Vented Lead Acid Type “ battery is proposed for UPS.

3.5

The Battery back-up time shall be 2-hours in case of normal AC supply failures as per ClNo-2.4A.4, page 9 of 21 of APPENDIX-VII (Instrumentation & Control) of PTS-1022.

4.0

UPS SIZING :

4.1

The individual input VA requirement for each load is calculated considering power factor 0.8 as per the following equation. Load in VA

=

Load in Watt ------------------------Power Factor

4.2

The sizing calculation worksheets is attached as “Annexure-1”

4.3

The critical loads, which are listed in Annexure-1, has been considered for the UPS sizing calculation.

4.4

The Unit Loads(in watt) considered in Annexure-1 are on the basis of assumption.

4.5

Growth Factor of 1.25 has been considered to allow future expansion of loads as per Cl No-8.3, page 9 of 15 of SES-P-103.05.

5.0

CONCLUSION:

5.1

The UPS rating of 7 kVA is considered to be adequate as per calculations in Annexure-1 attached. ISSUE P0A

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