Advanced Protection Relays Coordination in Distribution Network System (Software Tools) Course

Course Overview:

The course delves into issues of primary importance related to electrical protection and coordination of distribution systems with an overview of fundamental concepts, device selection and application.

Students will learn how to implement pickup and delay settings, optimize selectivity for fuses, breakers and relays, and understand IEC standards for installation and protection devices. 

Major subjects include ground fault protection, coordination in unit substations, and bulk distribution switching stations. Simulation exercises and case studies are used in addition to theoretical instruction in order to prepare participants to deal with practical problems of system protection and coordination. 

This course is suitable for engineers, managers, and consultants working in the utility, industrial and commercial sectors and provides practical guidance on improving system safety and reliability.

Course Objectives:

By the end of the training, participants will be able to deal with:

• The Use of Pickup Settings
• The Use of Delay Settings
• Selectivity and Instantaneous Trips
• Identifying Complete Selectivity
• Identifying Selectivity of Fuses and Low Voltage Circuit Breakers
• Selectivity and Overcurrent Relays
• Unit Substation and Primary Device Settings
• Standards
• IEC Standards for Electrical Installation
• Protection and control devices
• General characteristics (circuit breakers, Trip curves, Limitation curves, Specific let-through energy curves, Temperature derating, Altitude derating, Electrical characteristics of switch disconnectors, etc.)
• Protection Coordination
• Discrimination Tables
• Back-Up Tables

Who Should Attend?

This course is intended for Engineers, Managers, and other professionals working in organizations interested in electricity protection and coordination, Professionals working in the design of system protection and coordination, Engineers working in the distribution network, Consultants in the field of the protection and control, Engineers with the utility, commercial and industrial sectors.

Course Outlines:

Fundamentals of Distribution Systems

• Primary Distribution Configurations
• Urban Networks
• Primary Voltage Levels
• Distribution Substations
• Sub transmission Systems
• Differences between European and North American Systems
• Loads
• The Past and the Future

Introduction to the coordination Problem

• Time Current Characteristics of Loads
• Origin of Power System Faults
• Overview of Fault Time Frame
• Protection Points on Low and Medium Voltage Circuits
• Manufacture Time Current Characteristic Curves
• Solving Problems in Time Current Characteristic Scaling

General Considerations

• Basic Longhand Calculation
• Beyond the Infinite Bus Calculation
• Fault Current Sources
• The Fault Power Method of Short Circuit Calculation
• Very Low-Level Fault Currents
• Single Phase Short Circuit Calculation
• Computer Modeling of Fault Dynamics
• Practical Exercises

Design and application principles

• Device Selection Consideration
• Asymmetry in Protective Device Rating
• Fuse Application Principle
• Low and Medium Voltage Breaker Application Principles
• Sensing Elements
• Transformer Through Fault Protection
• Applications of The Differential Principle
• Time and Current Margins Between Overcurrent Devices
• Overcurrent Devices
• Principle Application and Relays

Ground Fault Protection

• Relevant Theory
• Modes of Fault Circuits
• Controlling Ground Fault Current
• Methods of Sensing Ground Fault Current
• Typical Ground Fault Protection Schemes
• Solved examples

Protection and Coordination in Power Panels

• Low Voltage Distribution Circuits
• Application of Low Voltage Fuses
• Applications of Low Voltage Circuit Breakers
• Conductor Protection
• Transformer Protection
• Solved examples

Protection and Coordination for Motor and Motor Control Center

• Relevant Theory of Induction Motors
• Overcurrent Protection Strategies
• Protection of Groups of Induction Motors
• Protection of Large Motors
• Transformer Protection
• Solved examples

Protection and Coordination in Unit Substations

• Transformer Protection
• Medium Voltage Power Fuses
• Transformer Primary Circuit Breaker
• Coordination of Primary Fuses and CBS
• Secondary Main Breakers
• Secondary Feeder Breakers
• Unit Substation Overcurrent Coordination
• Double Ended Substation Coordination
• Coordination Ground Fault Protection
• Flowchart for Selection of Substation Breaker Trip Function

Protection and Coordination for Bulk Distribution Switching Stations

• Medium Voltage Breakers
• Instrument Transformers
• Generalized Overcurrent Relays o Application Principle
• Application Principle
• Coordination Invertedness
• Voltage Drop Consideration
• Instantaneous Elements
• Directional Overcurrent
• Ground Overcurrent
• Directional and Ground Relays
• Special Application Consideration Regarding Digital Based Relays
• Cable and Feeder Overcurrent Protection
• Buss Differential Protection
• Unit Substation Overcurrent Coordination
• Solved examples

Protection and Coordination for Motor and Motor Control Center

• Generalized Consumer Utility Interconnect Protection Coordination
• Single Feed Device
• Dual Feed Service
• Typical Service Configuration with Local Generation
• Coordination Consumer Switchgear with Utility Circuit Recloses
• Solved examples