C-2.4.2 Electrical Design Philosophy

ELECTRICAL DESIGN PHILOSOPHY (M205EIL-CPF-E-BD-0002)

SECTION C-2.4.2 DOCUMENT No. A358-CPF-16-50-BD-0002 Rev-A Page 1 of 29

ELECTRICAL DESIGN PHILOSOPHY

UNIT

: CENTRAL POLYMER FACILITY

PACKAGE

: PACKAGE-1

A

20.11.2012

Rev. No

Date

ISSUED WITH FEED PACKAGE

Format No. EIL 1650-1296P Rev. 2

Purpose

VB

RKS

VKJ

Prepared by

Checked by

Approved by

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ELECTRICAL DESIGN PHILOSOPHY (M205EIL-CPF-16-50-BD-0002)

DOCUMENT No. A358-CPF-16-50-BD-0002 Rev-A Page 2 of 29

TABLE OF CONTENTS 1.0

SCOPE ....................................................................................................................................... 3

2.0

SPECIFICATIONS, ITP’S & DATASHEETS ............................................................................. 3

3.0

STANDARDS ............................................................................................................................. 3

4.0

STATUTORY REQUIREMNTS.................................................................................................. REQUIREMNTS .................................................................................................. 4

5.0

SYSTEM DESIGN PHILOSOPHY ............................................................................................. 4 General ......................................................................................................................... 4 5.1 5.2 AREA CLASSIFICATION and EQUIPMENT SELECTION ......................................... 4

6.0

7.0

5.3 5.4

Power system Design ................................................................................................. 5 Capacity of Electrical system..................................................................................... system ..................................................................................... 5

5.5

System voltages .......................................................................................................... 6

5.6 5.7 5.8 5.9

Allowable Voltage Drop .............................................................................................. System Earthing .......................................................................................................... Short Circuit Capacities.............................................................................................. Capacities .............................................................................................. Insulation system ........................................................................................................

5.10

Protection and Metering schemes ............................................................................. 9

5.11 5.12 5.13

DC Power Supply......................................................................................................... Supply......................................................................................................... 9 Emergency Power supply........................................................................................... supply ........................................................................................... 9 Uninterrupted Power Supply (UPS) ......................................................................... 10

5.14

Power Factor Improvement ...................................................................................... 10

5.15

Harmonics Elimination.............................................................................................. Elimination.............................................................................................. 10

7 8 8 9

EQUIPMENT DESIGN PHILOSOPHY..................................................................................... PHILOSOPHY..................................................................................... 10 General ....................................................................................................................... 10 6.1 6.2 Transformers.............................................................................................................. Transformers.............................................................................................................. 10 6.3 Switch Gear ................................................................................................................ 11 6.4

BUS DUCT .................................................................................................................. 14

6.5 6.6

Neutral Grounding Resistor ..................................................................................... 14 Electric Motors........................................................................................................... Motors ........................................................................................................... 14

6.7

Control Station........................................................................................................... Station ........................................................................................................... 15

6.8 6.9 6.10 6.11

Black Start and Emergency Generators.................................................................. Generators .................................................................. 15 Lighting Systems....................................................................................................... Systems ....................................................................................................... 16 SOCKET OUTLETS.................................................................................................... OUTLETS .................................................................................................... 17 Earthing and Lightning Protection .......................................................................... 18

6.12

AC/DC Distribution Boards....................................................................................... Boards....................................................................................... 20

6.13 6.14 6.15

DC Power Supply Systems....................................................................................... Systems ....................................................................................... 20 Uninterruptible Power Supply (UPS) System ......................................................... 21 Batteries ..................................................................................................................... 22

6.16

Cables ......................................................................................................................... 22

6.17 6.18 6.19 6.20

Cable Tray .................................................................................................................. 23 Equipment Enclosures.............................................................................................. Enclosures.............................................................................................. 25 Actuators for Motor Operated Value........................................................................ Value........................................................................ 25 ELECTRICAL SUBSTATION BUILDINGS ................................................................ 25

6.21 6.22

CATHODIC PROTECTION ......................................................................................... 28 Electric heat tracing (EHT) System.......................................................................... System .......................................................................... 29

33KV OVERHEAD POLE LINE ............................................................................................... 29

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ELECTRICAL DESIGN PHILOSOPHY (M205EIL-CPF-16-50-BD-0002)

DOCUMENT No. A358-CPF-16-50-BD-0002 Rev-A Page 3 of 29

1.0

SCOPE This specification along with the applicable project design basis / data form the basis for developing detailed design and engineering for electrical facilities including electrical power system , electrical equipment , Electrical Installation etc .

2.0

SPECIFICATIONS, ITP’S & DATASHEETS The following specifications shall be referred for additional information for procurement, installation and pre-commissioning of electrical equipment and material. CAIRN-TSG-E-SP-0001

Specification for Oil Type Transformers

CAIRN-TSG-E-SP-0002

Specification for Medium Voltage Induction Motors

CAIRN-TSG-E-SP-0004

Specification for Dry Type Lighting Transformers

CAIRN-TSG-E-SP-0005

Specification for Medium Voltage Switch Gears

CAIRN-TSG-E-SP-0006

Specification for High Voltage Switch Gears

CAIRN-TSG-E-SP-0007

Specification for Power and Control cables

CAIRN-TSG-E-SP-0008

Specification for Electrical Heat Tracing

CAIRN-TSG-E-SP-0009

Specification for Lighting Systems

CAIRN-TSG-E-SP-0010

Spec for FLP control stations

CAIRN-TSG-E-SP-0011

Spec for FLP Light fittings and JB's

CAIRN-TSG-E-SP-0012

Spec for hazardous Area Plugs , sockets and hand lamps

CAIRN-TSG-E-SP-0013

Spec for safe area industrial type control stations

CAIRN-TSG-E-SP-0015

Spec for Uninterruptable Power Supply ( AC )

CAIRN-TSG-E-SP-0016

Specification for DC Power supply system

CAIRN-TSG-E-SP-0017

Project General - AC-DC Distribution Boards

CAIRN-TSG-E-SP-0018

Electrical Cable Tray System

CAIRN-TSG-E-SP-0019

Cathodic Protection

CAIRN-TSG-E-SP-0020

Project General - Variable Frequency Drives - VFD / Soft Starters

CAIRN-TSG-E-SP-0021

Project General - Neutral Grounding Resistor

CAIRN-TSG-E-SP-0022

Motor Operated Valve (MOVs)

CAIRN-TSG-E-SP-0023

Specification for Packaged Substation

CAIRN-TSG-E-SP-0024

Electrical Specification For Construction Power Supply System

CAIRN-TSG-E-SP-0025

Electrical Specification for High Mast Lighting

3.0

STANDARDS

3.1

All electrical equipments shall be in conformance with Central Electrical Authority (CEA) Regulations & Indian Electricity Rules 1956 (IER 1956) as applicable. Any other regulatory design requirements and approvals needs to be followed where ever applicable.

3.2

Employ the standards, as applicable, in the design as per relevant specification a.

Oil Industries Safety Standards ( OISD )

b.

Bureau of Indian Standards (BIS or IS)

c.

International Electro-technical Commission (IEC) Standards ( wherever relevant IS standards are not available )

d.

IEEE standards (wherever IS / IEC standards are not available.

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ELECTRICAL DESIGN PHILOSOPHY (M205EIL-CPF-16-50-BD-0002)

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e.

National Association of Corrosion Engineers (NACE) Recommended Practice for Cathodic Protection

f.

NFPA standards as part of fire proofing and design of substation buildings

3.3

Metric SI system of units shall be applied to all dimensions and documents.

4.0

STATUTORY REQUIREMENTS Indian electricity Act Indian Electricity Rules The Factory Act Oil Mines Regulations Requirements of other statutory bodies as applicable, e.g. Central Electricity Authority (CEA)/State Electrical inspectorate, CCE, DGMS

5.0

SYSTEM DESIGN PHILOSOPHY

5.1

General The Electrical system shall be designed to provide

5.2

a.

safety to plant, personnel and equipment during operation and maintenance

b.

Reliability of service

c.

flexibility of operation and maintenance

d.

Minimal fire risk

e.

Reliable Protection system through selective relaying system.

f.

Adequate provision for future extension and modification

g.

Effective power management and load shedding

h.

Low harmonics in the system as per standards

i.

Rated performance at applicable environment factors ( Project specific )

AREA CLASSIFICATION and EQUIPMENT SELECTION 5.2.1

Hazardous classification of areas and installations shall be in accordance with IS 5572 , IS14154, OISD standards and Oil mines regulations act .All the area within the battery limits shall be classified for the degree and the extent of hazard from flammable materials.

5.2.2

Following factors shall be considered for proper selection of electrical equipment for use in hazardous area. •

•

•

•

Area classification as per Zone Gas classification as per Group – The characteristic of the gas or vapour involved in relation to the ignition current or minimum ignition energy and safe gap data. Dust classification as per Group. – The Characteristic of the dust involved Temperature classification – The Ignition temperature of the gas, Vapour or dust involved or the lowest of the ignition temperature if more t han one combustible is present.

Format No. EIL 1650-1296P Rev. 2

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ELECTRICAL DESIGN PHILOSOPHY (M205EIL-CPF-16-50-BD-0002)

DOCUMENT No. A358-CPF-16-50-BD-0002 Rev-A Page 5 of 29

•

5.3

Environment condition in which apparatus is to be installed – the selected electrical equipments apparatus shall be adequately protected against corrosive and solvent agencies, water ingress, thermal and mechanical stresses as determined by the environmental conditions.

5.2.3

All the electrical Equipment installed in hazardous areas shall be selected as per IS-5571 and IS 14154 and shall meet the requiremnts of relevant IS and statutory regulations . However , electrical equipments for Zone 2 areas as a minmum shall be EX(e) / EX (n)type as per IS/ IEC codes . increased saftety type Ex(e) equipment shall not be used in zone 1 areas . Type of explosion protection to be used for individual equipment shall not be as specfied in the job design data.

5.2.4

As far as possible Pressurised electrical equipments need to be avoided as along as other alternative is available. In case using pressurised equipment (Type Ex (p) then on failure of pressurisation system, the following minimum actions shall be provided. 1.

For Zone 1 the equipment needs to switched off and alarm needs to be initiated.

2.

For Zone 2 Alarm needs to be initiated

5.2.5

All electrical equipment to be used in classified areas shall be certified by CMRI /CPRI/ERTL or equivalent recognized independent test house such as BASEEFA/LCIE/PTB/UL/FM. All equivalent (Indigenous and imported) shall also have valid statutory approvals as applicable for use in the specified hazardous area . The indigenous equipment shall confirm to Indian standards and shall be approved by CCE/ DGMS as applicable based on mines non mines application. All mines application shall be under DGMS jurisdiction and shall be defined based on project condition in design basis.

5.2.6

All mines area electrical equipments to be used in hazardous area are type tested by other reputed agencies outside India, the vendor shall approach applicable statutory bodies specified above and get the equipment approved by them for use in the specified area of utilization prior to energization.

5.2.7

The product transported along the pipe rack is heavy crude combined with water and is deemed non-hazardous.

5.2.8

The well heads will be classified zones.

5.2.9

The hazardous area motors (Ex (e), or Ex (d) fed by variable frequency drive shall be certified as a combination for the specified location by independent test house and shall have valid statutory approvals. Non -sparking (Ex (n) motors shall not be used were solid state starters/ VFD’s are used for separating purpose of the motor. In case of flame proof motor and variable frequency drive combination may not be certified together if direct temperature control by embedded temperature sensors are provided which will disconnect the motors.

Power system Design The power distribution shall be designed in accordance with project specification taking into account all possible factors affecting the choice of the system to be adopted such us required continuity of supply , flexibility of operation , operating cost , reliability of supply from available power sources , total load and the concentration of individual loads .

5.4

Capacity of Electrical system

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ELECTRICAL DESIGN PHILOSOPHY (M205EIL-CPF-16-50-BD-0002)

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All the components of the electrical system shall be sized to suit the maximum load, under the most severe operating conditions. Accordingly, the maximum simultaneous consumption of power, required by continuously operating loads shall be considered and an additional margin shall be taken into account for intermittent service loads, if any. The amount of electrical power consumed by each process unit shall be calculated for its operation at the design capacity. System design shall permit direct on line starting of all motors unless specified otherwise 5.5

System voltages

Power distribution between terminal to well

33KV + 10%, 3ph, 3W, 50 Hz + 3%, solidly

pads and remote areas outside the terminal

grounded. ( To be referred with Design basis of specific projects )

Power distribution

415V + 6%, 3ph, 3W, 50Hz + 3%. 240 V, +/- 6 %, 3 PH, 3 W system for Lighting and Small power ( To be referred with Design basis / SLD of specific projects )

Utilization voltage (Motors/Heaters > 160KW)

6.6KV + 6%, 3ph, 3W, 50 Hz + 3%, resistance grounded

Utilization voltage (250W