Capacitor Sizing Calculation (5015 LT 00 EL 03 CA 0003) Rev 00

OIL AND NATURAL GAS CORPORATION LIMITED

Client:

L&T, E&C DIVISION

ADDITIONAL PROCESS UNITS

Contractor : Larsen & Toubro Limited,

Doc. No. : 5015-LT-00-EL-04-CA-0003 Rev. : 00

E&C DIVISION, Mumbai

CAPACITOR SIZING CALCULATION OWNER

: OIL AND NATURAL GAS CORPORATION LIMITED, URAN

UNIT

: ADDITIONAL PROCESS UNITS

L&T JOB NO.

: 5015

A

DOC. CATEGORY: DOCUMENT STATUS

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FINAL FOR CODE – 1

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REVIEWED AS COMMENTED. WORK SHALL PROCEED WITH FABRICATION / MANUFACTURING TAKING CARE AND INCORPORATING OWNER /PMC COMMENTS.

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RETAINED FORINFORMATION / RECORDS.

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DATE

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24.11.10

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REV.

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DESCRIPTION

PREPARED BY

CHECKED BY

HOD PEM APPROVED BY

LARSEN & TOUBRO LIMITED E&C DIVISION

PROJECT

: Additional Process Units

CUSTOMER

: ONGC, URAN

DOCUMENT NO.

CAPACITOR SIZING CALCULATION

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CONTENTS

SECTION

PAGE

1.

Scope...........................................................................................................................3

2.

Reference Documents................................................................................................. 3

3.

Capacitor sizing calculation.........................................................................................3

4.

Conclusion....................................................................................................................4

LARSEN & TOUBRO LIMITED E&C DIVISION

PROJECT

: Additional Process Units

CUSTOMER

: ONGC, URAN

DOCUMENT NO.

CAPACITOR SIZING CALCULATION

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:

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:

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1. SCOPE The scope of this document covers capacitor sizing calculation to be installed in APU Substation for Uran APU project.

2. REFERENCE DOCUMENTS

Engineering Design Basis Electrical

: V002-00-50-50-DB-001, Rev 1

Design Philosophy for Electrical Facilities

: 6-51-0099 Rev 04

Job Specification Electrical

: V002-00-50-50-SP-02-0

Overall Electrical Load Analysis

: 5015-LT-00-EL-03-CA-0001 Rev 0

Overall key single line Diagram

: 5015-LT-00-EL-00-SL-0002 Rev 0

3. CAPACITOR SIZING CALCULATION The kW and kVA loading on the HV switchboards HT-201 under normal running load as per overall electrical load analysis are as follows

KW 21244.6

NORMAL RUNNING LOAD/ MAXIMUM DEMAND LOAD KVAR KVA P.F. 11378.7 24100 0.881

The present power factor of 6.6kV bus is calculated as cos Ø1 = (kW/kVA) = 21244.6/24100=0.881 The required Power Factor as per ITB is 0.9. Hence cos Ø 2 = 0.9 Total MW considering 15% future load growth = 21.2446* 1.15 = 24.43 MW

Capacitive MVAR = MW * (tan (cos-1(cos Ø1))-tan (cos-1(cos Ø 2))) = 24.43 * (tan (cos-1(0.881))-tan (cos-1(0.9))) = 24.43 * (0.537-0.484) = 1.295 MVAr

LARSEN & TOUBRO LIMITED E&C DIVISION

PROJECT

: Additional Process Units

CUSTOMER

: ONGC, URAN

4.

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CONCLUSION The total capacitor bank rating shall be 1.295 MVAR. The capacitor bank on each bus section of HT -201 shall be selected as 650 KVAr.