Industrial Power Distribution Systems: Design, Protection and Fault Analysis – Paris, 30 Aug – 3 Sep 2027

Programme overview

Introduction:

Industrial power distribution networks grow by piecemeal additions, and many plants run with unverified cable ratings, outdated fault levels and relay settings that no longer discriminate, so a single fault can trip a whole process unit. This Core Concept course equips plant electrical engineers to choose network configurations, estimate demand, size cables for voltage drop and fault duty, calculate short-circuit currents with the IEC 60909-0 method, select earthing arrangements, grade protection and trace faults to root cause. Participants build a Plant Distribution Study Workbook for a network from their own site.

Course Objectives:

• Compare radial, ring and secondary selective network configurations and select one that meets plant continuity and maintenance needs
• Estimate maximum demand from connected load lists using demand and diversity factors and size feeders, busbars and cables for current rating and voltage drop
• Calculate balanced and unbalanced short-circuit currents with the IEC 60909-0 method and check equipment withstand against the results
• Select system earthing and neutral earthing arrangements for low and medium voltage networks and explain their effect on earth fault current
• Set overcurrent and earth fault relays with IDMT curves and produce a time-current coordination study that keeps discrimination between upstream and downstream devices
• Investigate electrical faults and outages with structured root-cause analysis and record corrective actions against the single-line diagram

Target Audience:

• Plant electrical engineers who extend, modify and keep records of site distribution networks
• Facility and utilities engineers responsible for supply continuity to process units, buildings and critical loads
• Project electrical engineers who prepare load lists, cable schedules and single-line diagrams for new installations
• Protection and power system study engineers who calculate fault levels and set relays for industrial networks
• Electrical reliability engineers who investigate trips, outages and repeat faults on plant feeders

Course Outline:

Day 1: Plant Network Configurations and Single-Line Diagrams

• Industrial Supply Intake Arrangements and Voltage Level Selection
• Radial, Ring Main and Secondary Selective Network Configuration Trade-Offs
• Single-Line Diagram Conventions, Device Numbers and Drawing Revision Control
• Connected Load List Preparation with Demand and Diversity Factors
• Current-State Network Survey Checklist for an Existing Plant

Day 2: Cable Sizing, Voltage Drop and Short-Circuit Calculation

• Cable Current Rating with Installation Method, Grouping and Ambient Derating Factors
• Voltage Drop Calculation for Feeders and Motor Starting Conditions
• IEC 60909-0 Equivalent Voltage Source Method and Voltage Factor c
• Initial Symmetrical, Peak and Breaking Short-Circuit Current Calculation Sheets
• Cable and Busbar Thermal Withstand Check Against Fault Duration

Day 3: System Earthing and Protection Coordination Studies

• IEC 60364 TN-S, TN-C-S, TT and IT Earthing Arrangements for Low Voltage Plant
• Solid, Resistance and Reactance Neutral Earthing and Zigzag Earthing Transformers
• IDMT Relay Curves to IEC 60255-151 and IEEE C37.112 Characteristics
• Pickup, Time Multiplier and Grading Margin Selection for Feeder Relays
• Time-Current Coordination Plot Construction Across Fuses, Breakers and Relays

Day 4: Power Quality, Emergency Power and Fault Analysis

• Power Factor Correction Capacitor Bank Sizing and Detuning Overview
• Harmonic Sources, Distortion Indicators and Mitigation Options Overview
• Standby Generator Sizing, Automatic Transfer Schemes and UPS Topologies
• Electrical Fault Types: Symmetrical, Line-to-Earth, Line-to-Line and Double Line-to-Earth
• Root-Cause Analysis of Plant Trips Using Event Records and Fault Trees

Day 5: Plant Distribution Study Workbook Build

• Case Network Data Collection and Impedance Model Assembly
• Load Flow and Voltage Profile Check for Normal and Contingency Cases
• Fault Level Table and Equipment Duty Comparison for the Case Network
• Relay Setting Schedule and Discrimination Review for the Case Network
• Plant Distribution Study Workbook Peer Review and Improvement Actions

Skills You Will Gain:

• Network Configuration Selection
• Maximum Demand Estimation
• Cable Sizing Calculation
• Short-Circuit Current Calculation
• Earthing Arrangement Selection
• Relay Grading and Coordination
• Standby Power Planning
• Electrical Fault Root-Cause Analysis

Why Attend This Course:

• Return with a Plant Distribution Study Workbook holding the load list, cable checks, fault levels and relay settings for a network from your own site
• Spot undersized cables, overdutied equipment and non-discriminating relays before a fault exposes them
• Explain network changes to project teams and management with calculations they can review and reuse
• Compare distribution design practice with engineers from oil and gas, petrochemicals, manufacturing, water, mining and large facilities

Conclusion:

A plant distribution network stays dependable when its configuration, cables, fault levels, earthing and protection settings are checked as one system. The course moves from network configurations, single-line diagrams and load estimation, through cable sizing, voltage drop and IEC 60909-0 short-circuit calculation, to earthing arrangements and relay coordination, then to power quality, emergency power and fault root-cause analysis. The final day brings these together in a Plant Distribution Study Workbook ready for the next network modification or outage review.