Electrical
Have any Questions? Call us Today!
+91-7982820525
Electrical
Detailed Summary of Work Done by the Electrical Department in the Oil & Gas Industry
Overview
- The Electrical Department is responsible for designing, supplying, installing, testing, commissioning, operating, and maintaining all electrical systems in oil and gas facilities.
- Its primary objective is to provide a safe, reliable, uninterrupted, and efficient power supply to all process plants, utilities, and safety systems while complying with international standards and hazardous area requirements.
1. Electrical System Design
The Electrical Department develops the complete electrical design for upstream, midstream, downstream, LNG, refinery, petrochemical, offshore, and onshore facilities.
Key Activities
- Develop Electrical Design Basis
- Establish electrical philosophy
- Select system voltage levels
- Prepare electrical calculations
- Optimize electrical distribution
- Ensure compliance with standards
- Improve energy efficiency
- Support project cost optimization
2. Power System Studies
Electrical engineers perform detailed power system studies to ensure system reliability and safety.
Studies Include
- Load Flow Analysis
- Short Circuit Study
- Motor Starting Study
- Voltage Drop Analysis
- Harmonic Analysis
- Arc Flash Study
- Protection Coordination Study
- Transient Stability Study
- Earthing Grid Analysis
Common Software
- ETAP
- SKM Power Tools
- DIgSILENT PowerFactory
- EasyPower
- CYME
3. Electrical Load List
The department prepares an Electrical Load List containing all electrical consumers.
Includes
- Process motors
- Utility motors
- HVAC loads
- Lighting
- UPS loads
- Emergency loads
- Fire & Gas systems
- Instrument loads
- Building services
- Spare capacity
Purpose
- Calculate plant electrical demand
- Size generators
- Size transformers
- Size switchgear
4. Electrical Load Calculations
Calculations Include
- Connected Load
- Running Load
- Peak Load
- Demand Load
- Future Expansion Load
- Emergency Load
- Essential Load
- Standby Load
These calculations determine the plant’s total power requirement.
5. Power Generation System
Electrical engineers specify and design:
- Gas Turbine Generators
- Diesel Generator Sets
- Steam Turbine Generators
- Emergency Generators
- Black Start Generators
- Solar PV Systems (where applicable)
Responsibilities
- Generator sizing
- Synchronization
- Load sharing
- Generator protection
- Fuel system coordination
6. Electrical Distribution System
Power is distributed from generation sources to all electrical loads.
Typical Voltage Levels
- 132 kV / 66 kV
- 33 kV
- 11 kV
- 6.6 kV
- 3.3 kV
- 690 V
- 415 V
- 230 V
- 24 V DC
Activities
- Distribution philosophy
- Feeder design
- Redundancy planning
- Reliability analysis
7. Transformer Engineering
Electrical engineers specify:
- Power transformers
- Distribution transformers
- Dry-type transformers
- Isolation transformers
- Earthing transformers
Responsibilities
- Transformer sizing
- Impedance selection
- Cooling method selection
- Tap changer specification
- Protection coordination
Applicable Standards
- IEC 60076
- IEEE C57 Series
8. Switchgear Engineering
Design and specification of:
- High Voltage Switchgear
- Medium Voltage Switchgear
- Low Voltage Switchgear
- Motor Control Centers (MCC)
- Intelligent MCCs
Responsibilities
- Busbar sizing
- Breaker selection
- Fault rating
- Interlocking
- Protection systems
9. Motor Engineering
Selection and specification of:
- Induction motors
- Synchronous motors
- Explosion-proof motors
- Variable speed motors
Responsibilities
- Motor sizing
- Starting method selection
- Protection selection
- Efficiency verification
- Hazardous area compliance
10. Variable Frequency Drives (VFDs)
Engineers specify VFDs for:
- Pumps
- Compressors
- Fans
- Blowers
- Cooling towers
Benefits
- Energy savings
- Process control
- Soft starting
- Reduced mechanical stress
11. Cable Engineering
Responsibilities Include
- Cable sizing
- Cable routing
- Voltage drop calculations
- Short-circuit withstand calculations
- Cable tray design
- Cable schedule preparation
Types
- HV cables
- MV cables
- LV cables
- Instrument cables
- Fiber optic cables
- Fire-resistant cables
12. Cable Tray System Design
Design Includes
- Cable tray layout
- Cable segregation
- Support spacing
- Loading calculations
- Fire barriers
- Expansion joints
13. Earthing (Grounding) System Design
Electrical engineers design grounding systems for personnel safety and equipment protection.
Activities
- Ground grid calculations
- Earth electrode design
- Step and touch voltage analysis
- Equipment grounding
- Lightning grounding
- Static grounding
Applicable Standards
- IEEE 80
- IEC 60364
14. Lightning Protection System
Design Includes
- Air terminals
- Down conductors
- Ground electrodes
- Surge protection devices (SPDs)
- Risk assessment
Applicable Standard
- IEC 62305
15. Hazardous Area Classification
Electrical engineers ensure safe installation of electrical equipment in explosive atmospheres.
Activities
- Hazardous area review
- Equipment certification
- Zone classification coordination
- Equipment selection
Hazardous Zones
- Zone 0
- Zone 1
- Zone 2
- Class I Division 1
- Class I Division 2
Applicable Standards
- IEC 60079
- NEC
- ATEX (where applicable)
16. Lighting System Design
Design Includes
- Indoor lighting
- Outdoor lighting
- Emergency lighting
- Escape route lighting
- Flood lighting
- High mast lighting
Calculations Include
- Lux levels
- Fixture spacing
- Energy efficiency
Software
- DIALux
- AGi32
17. Uninterruptible Power Supply (UPS)
Design Of
- AC UPS
- DC UPS
- Industrial UPS
- Battery systems
Critical Loads
- DCS
- ESD
- Fire & Gas
- Telecom
- Control room equipment
18. Battery System Engineering
Responsibilities
- Battery sizing
- Charger sizing
- Backup duration calculations
- Ventilation requirements
- Battery room design
Battery Types
- VRLA
- Ni-Cd
- Lithium-ion (where applicable)
19. Electrical Protection System
Protection Includes
- Overcurrent protection
- Earth fault protection
- Differential protection
- Distance protection
- Reverse power protection
- Under-voltage protection
- Over-voltage protection
- Frequency protection
20. Electrical Safety
The department ensures compliance with electrical safety standards through:
- Arc flash mitigation
- Lockout/Tagout (LOTO)
- Electrical isolation procedures
- Protective relay coordination
- Safe clearance distances
- Personal Protective Equipment (PPE) requirements
21. Vendor Document Review
Electrical engineers review:
- Single Line Diagrams (SLDs)
- Wiring diagrams
- Cable schedules
- Panel layouts
- GA drawings
- Protection settings
- Relay logic diagrams
- Equipment manuals
22. Procurement Support
Responsibilities
- Prepare electrical specifications
- Technical bid evaluations
- Vendor clarification
- Material requisitions
- Factory inspections
- Technical recommendations
23. Factory Acceptance Test (FAT)
Witness testing of:
- Switchgear
- Transformers
- Motors
- UPS
- VFDs
- Protection relays
- Generator control panels
24. Site Installation Support
Activities
- Cable installation inspection
- Equipment installation checks
- Earthing verification
- Cable termination inspection
- Panel installation review
- Transformer installation
- Motor alignment verification
25. Pre-Commissioning and Commissioning
Electrical engineers support:
- Insulation resistance testing
- Continuity testing
- Transformer testing
- Relay testing
- Motor rotation checks
- Functional testing
- Energization procedures
- Performance verification
26. Operation and Maintenance Support
Routine Activities
- Preventive maintenance
- Predictive maintenance
- Corrective maintenance
- Thermographic inspections
- Partial discharge monitoring
- Transformer oil testing
- Battery maintenance
- Relay calibration
27. Reliability Engineering
Activities Include
- Root Cause Failure Analysis (RCFA)
- Failure Mode and Effects Analysis (FMEA)
- Power system reliability studies
- Equipment life assessment
- Spare parts optimization
- System availability improvement
28. Energy Management
The Electrical Department helps reduce energy consumption by:
- Power factor correction
- Demand management
- Harmonic mitigation
- Efficient motor selection
- LED lighting upgrades
- Energy monitoring systems
- Load optimization
29. Brownfield and Revamp Projects
Electrical engineers assess:
- Existing electrical infrastructure
- Capacity upgrades
- Switchgear replacements
- Transformer replacements
- Cable rerouting
- Generator upgrades
- Protection system modernization
30. Typical Engineering Deliverables
The Electrical Department produces:
- Electrical Design Basis
- Electrical Philosophy
- Electrical Load List
- Electrical Load Summary
- Single Line Diagrams (SLDs)
- Load Flow Study Reports
- Short Circuit Study Reports
- Motor Starting Study Reports
- Protection Coordination Study
- Arc Flash Study
- Cable Schedules
- Cable Routing Drawings
- Cable Tray Layouts
- Earthing Layout Drawings
- Lightning Protection Layouts
- Lighting Layouts
- Transformer Datasheets
- Motor Datasheets
- Switchgear Datasheets
- UPS Datasheets
- Battery Datasheets
- Material Requisitions
- Technical Bid Evaluations
- Vendor Document Reviews
- Factory Acceptance Test (FAT) Reports
- Site Acceptance Test (SAT) Reports
- Commissioning Procedures
- Operation and Maintenance Manuals
- As-Built Drawings
31. Major Standards and Codes
The Electrical Department follows international standards, including:
- IEC 60038 – Standard Voltages
- IEC 60364 – Electrical Installations
- IEC 60079 – Explosive Atmospheres
- IEC 60909 – Short-Circuit Calculations
- IEC 61439 – Low-Voltage Switchgear
- IEC 62271 – High-Voltage Switchgear
- IEEE 80 – Grounding
- IEEE 242 (Buff Book) – Industrial Power Systems
- IEEE 399 (Brown Book) – Power System Analysis
- IEEE 1584 – Arc Flash
- NFPA 70 (National Electrical Code)
- NFPA 70E – Electrical Safety in the Workplace
- API RP 14F / 14FZ – Electrical Systems for Offshore Facilities
- ATEX Directives (where applicable)
32. Coordination with Other Engineering Disciplines
The Electrical Department works closely with:
- Process Engineering: Power requirements for process equipment and utilities.
- Mechanical Engineering: Motors, generators, compressors, pumps, and rotating equipment.
- Instrumentation & Control: Power supply for DCS, PLC, ESD, and field instruments.
- Piping Engineering: Cable tray routing and equipment access.
- Civil & Structural Engineering: Equipment foundations, cable trenches, and electrical buildings.
- Telecommunications: Power for communication and security systems.
- Project Engineering: Procurement, scheduling, and project execution.
- Construction & Commissioning: Installation, testing, energization, and startup.
- Operations & Maintenance: Troubleshooting, maintenance planning, and system reliability.
Typical Electrical Engineering Workflow
- Develop the Electrical Design Basis and electrical philosophy.
- Prepare the electrical load list and load calculations.
- Perform power system studies (load flow, short circuit, motor starting, protection coordination, etc.).
- Select generators, transformers, switchgear, motors, and UPS systems.
- Design power distribution, grounding, lightning protection, lighting, and cable systems.
- Prepare engineering drawings, specifications, datasheets, and material requisitions.
- Review vendor documents and support procurement.
- Supervise factory testing, site installation, and commissioning.
- Energize electrical systems and verify operational performance.
- Support operation, maintenance, reliability improvement, and future expansion projects.