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Graham Van Brunt P. Eng., B.Sc.

Here we deal with the protection & control principles of high voltage stations. HV Bus Differential Protection is studied  along with restrictions due to CT saturation & mis-match and its solution, “Restraint Differential Protection”.

Starting with System Faults and how they affect  Switchyard Configuration & Elements simple “Differential Protection” is examined along with the mal-operation due to CT saturation and mis-match.

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Here we deal with the protection & control principles of high voltage stations. HV Bus Differential Protection is studied  along with restrictions due to CT saturation & mis-match and its solution, “Restraint Differential Protection”.

Starting with System Faults and how they affect  Switchyard Configuration & Elements simple “Differential Protection” is examined along with the mal-operation due to CT saturation and mis-match.

High Voltage Circuit Breakers are examined as to the various Types (Oil, Vacuum, Air Blast, SF6), their Controls (Closing/Tripping/anti-pumping) Reclosure Syncrocheck relay CUH 90 – VG as well as Breakers Failure Protection is part of this module along with a quick look at Dynamic Monitoring Equipment. Transfer & remote tripping along with the need to provide immunity from ground rise potential and open circuit situations.

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What's inside

Learning objectives

  • Here we deal with the protection & control principles of high voltage stations. hv bus differential protection is studied along with restrictions due to ct saturation & mis-match and its solution, “restraint differential protection”.
  • System faults; switchyard configuration & elements; the desn station (duel element spot network); hv bus differential protection; ct saturation & mal-operation of bus protection; ct saturation & restraint differential protection; westinghouse kd - 4 relay; surge protective devices; fuses; dc protection; logic differential protection; the modern ied relays (intelligent electronic device); overview hv circuit breaker types (oil, vacuum, air blast, sf6); hv circuit breaker controls (closing & tripping); hv circuit breakers; reclosing (syncrocheck cuh 90 – vg relay); dynamic monitoring equipment (dme); impedance relaying (pott)

Syllabus

Introduction

Here you will find a good review of what is in this section.

The various types and configuration of utility and industrial power facilities are examined here.

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In this lecture you will find, protection schemes, zones of protection, types of electrical faults, the ANSI (American National Standards Institute)  standard device numbering system and other common relay terminology.

Current and voltage transformers are examined in this lecture.

Here Power Transformers are looked at from the perspective of configurations connections & cooling.

Various surge protective devices are looked at here.

The main types of circuit breakers are looked at here: Oil Breakers; Air Blast Breakers;  Vacuum Breakers;  SF6 Breakers

 



Breaker controlled tripping & closing; the trip free function; anti-pump are examined in this lecture along with the auto-reclose feature.The SEL-751 and the BBC CUH-90 relays are compared.

Instantaneous & Timed Over Current Protection is studied using GE & Westinghouse mechanical relays as examples comparing them to the SEL-351 Distribution and Transmission Relay.

this is one of the most effective and common forms of protection used for almost every element of the power system.

The Impedance or Distance relays are mainly used for line protection. Permissive Overreach Transfer Trip (POTT) and Directional Comparison Protection schemes are looked at using the Westinghouse KD relay in comparison to the GE D60 (Multilin™) Line Distance Protection System.


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Activities

Be better prepared before your course. Deepen your understanding during and after it. Supplement your coursework and achieve mastery of the topics covered in Protection and Control of High Voltage Power Circuits with these activities:
Review Power System Fundamentals
Reinforce your understanding of basic power system concepts, including voltage, current, power, and impedance, which are essential for understanding protection and control schemes.
Browse courses on Power Systems
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  • Review notes and textbooks on power system analysis.
  • Work through practice problems on fault calculations and power flow.
  • Familiarize yourself with per-unit calculations.
Review 'Protective Relaying: Principles and Applications' by J. Lewis Blackburn and Thomas J. Domin
Gain a deeper understanding of protective relaying principles and applications by studying a comprehensive textbook.
View Melania on Amazon
Show steps
  • Read chapters related to differential protection and overcurrent protection.
  • Work through example problems in the book.
  • Compare the book's explanations with the course material.
Simulate Fault Scenarios
Practice simulating various fault scenarios in a power system simulation software to understand the behavior of protection devices.
Show steps
  • Install and learn to use a power system simulation software (e.g., ETAP, SKM PowerTools).
  • Create a simple power system model with generators, transformers, and transmission lines.
  • Simulate different types of faults (e.g., single-line-to-ground, three-phase) at various locations.
  • Observe the response of protective relays and circuit breakers.
Four other activities
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Show all seven activities
Explore IEEE Standards on Protective Relaying
Familiarize yourself with relevant IEEE standards related to protective relaying to ensure compliance and best practices.
Show steps
  • Identify key IEEE standards related to protective relaying (e.g., C37.90, C37.101).
  • Review the standards to understand the requirements for relay testing, application, and coordination.
  • Document the relevant standards and their implications for protection system design.
Create a Presentation on Bus Differential Protection
Solidify your understanding of bus differential protection by creating a presentation explaining its principles, applications, and limitations.
Show steps
  • Research bus differential protection schemes and their advantages/disadvantages.
  • Prepare slides covering the basic principles, CT requirements, and protection zones.
  • Include examples of practical applications and case studies.
  • Present the material to peers or colleagues for feedback.
Review 'Power System Relaying' by Stanley H. Horowitz and Arun G. Phadke
Deepen your knowledge of power system relaying with a focus on both electromechanical and digital relays.
Show steps
  • Read chapters on advanced relaying techniques and digital protection.
  • Study the examples of relay applications in different power system scenarios.
  • Compare the book's approach to relaying with the course's approach.
Design a Protection Scheme for a High Voltage Substation
Apply your knowledge by designing a complete protection scheme for a high voltage substation, including relay selection, coordination, and settings.
Show steps
  • Define the substation configuration and load requirements.
  • Perform fault studies to determine fault currents at various locations.
  • Select appropriate relays and circuit breakers for each protection zone.
  • Coordinate relay settings to ensure proper selectivity and sensitivity.
  • Document the design and justify the choices made.

Career center

Learners who complete Protection and Control of High Voltage Power Circuits will develop knowledge and skills that may be useful to these careers:
Protection and Control Engineer
A Protection and Control Engineer designs, develops, and maintains protective systems for electrical power infrastructure. This course directly addresses the core skills needed to excel as a Protection and Control Engineer. The course content on HV Bus Differential Protection, CT saturation, and Restraint Differential Protection are essential considerations in the real-world design of protection schemes. Similarly, understanding High Voltage Circuit Breakers and their controls, as well as reclosing mechanisms and breaker failure protection, are critical for ensuring power system reliability. A Protection and Control Engineer would benefit from the course's coverage of System Faults, Switchyard Configuration, and Dynamic Monitoring Equipment, as these elements form the foundation of effective protective system design.
System Protection Specialist
A System Protection Specialist is responsible for designing, implementing, and maintaining protection schemes for electrical power systems. The principles discussed in this course are fundamental to a System Protection Specialist. The course's focus is on HV Bus Differential Protection, CT saturation, and Restraint Differential Protection. The detailed exploration of High Voltage Circuit Breakers, their controls (Closing/Tripping/Anti-pumping), and Breaker Failure Protection are highly applicable. Understanding System Faults and Switchyard Configuration forms the basis for designing effective protection strategies.
Protection System Designer
A Protection System Designer specializes in the design and configuration of protective relaying systems for power networks. This course directly supports the work of a Protection System Designer by providing core knowledge related to high voltage station protection. The detailed study of HV Bus Differential Protection, including the restrictions due to CT saturation and mismatch, is essential for effective design. Furthermore, the coverage of High Voltage Circuit Breakers, their control mechanisms, and breaker failure protection directly applies to the designer's considerations. A Protection System Designer will benefit from the course's overview of System Faults and Switchyard Configuration.
Power System Protection Technician
A Power System Protection Technician installs, tests, and maintains the protective relaying systems that safeguard electrical grids. This course provides valuable expertise applicable to a Power System Protection Technician. The coverage of various circuit breaker types, along with their control mechanisms like closing, tripping, and anti-pumping functions, equips a technician with practical knowledge for installation and maintenance tasks. Additionally, the course delves on reclosing systems (Syncrocheck CUH 90 – VG Relay) which helps to learn how to troubleshoot malfunctions. System Faults and Switchyard Configurations are also discussed, giving a Power System Protection Technician the contextual awareness needed to perform their job effectively.
Relay Technician
A Relay Technician specializes in the maintenance, testing, and calibration of protective relays used in power systems. This course is highly relevant for a Relay Technician. It focuses on the protection and control principles of high voltage stations, which are the core systems a Relay Technician deals with. The material on HV Bus Differential Protection, CT saturation, and Restraint Differential Protection directly enhances a Relay Technician's ability to diagnose and repair relay malfunctions. The course's examination of High Voltage Circuit Breakers, their controls, and breaker failure protection provides in-depth knowledge of the equipment a Relay Technician works with daily. Knowing about System Faults and Switchyard Configuration would improve the technician's overall understanding of the power system context.
Electrical Engineer
An Electrical Engineer designs, develops, tests, and supervises the manufacturing of electrical equipment. This course is applicable to an Electrical Engineer working primarily on power systems, focusing on the protection aspects of high voltage networks. The coverage of System Faults and Switchyard Configuration, along with the detailed examination of HV Bus Differential Protection and CT saturation issues, provides an Electrical Engineer with critical insights for designing robust and reliable power systems. An Electrical Engineer would find the sections on High Voltage Circuit Breakers and their control mechanisms, including reclosing and breaker failure protection, particularly useful. Understanding Dynamic Monitoring Equipment helps an Electrical Engineer implement advanced diagnostic capabilities in their designs.
Substation Engineer
A Substation Engineer is responsible for the design, construction, and maintenance of electrical substations. This course is highly applicable because it focuses on the core protection and control aspects of high voltage stations. As a Substation Engineer, one needs a strong grasp of HV Bus Differential Protection, including the challenges posed by CT saturation and mismatch. The course's detailed coverage of High Voltage Circuit Breakers–their types, controls, and failure protection mechanisms–are also essential for safe and reliable substation operation. The understanding of System Faults and Switchyard Configuration covered in this course provides foundational knowledge for effective substation design.
Utility Engineer
A Utility Engineer works for a utility company, managing various aspects of the power system infrastructure. This course is relevant for Utility Engineers involved in the protection and control of high voltage power systems. Knowing about System Faults and Switchyard Configuration is a fundamental skill for assessing the reliability and resilience of the grid. The discussion of HV Bus Differential Protection, CT saturation, and High Voltage Circuit Breakers is important for engineers responsible for maintaining and upgrading utility infrastructure. Understanding Dynamic Monitoring Equipment will help in implementing advanced diagnostic capabilities.
Power Systems Engineer
A Power Systems Engineer designs, analyzes, and maintains the systems that generate and distribute electrical power. This course is relevant for a Power Systems Engineer focused on the protection and control aspects of high voltage transmission and distribution. System Faults and their impact on Switchyard Configuration are fundamental concepts a Power Systems Engineer must understand. Learning about HV Bus Differential Protection, CT saturation, and Restraint Differential Protection provides targeted knowledge for designing effective protection schemes. The course's exploration of High Voltage Circuit Breakers and Dynamic Monitoring Equipment offers practical insights applicable to maintaining the reliability and stability of power systems.
SCADA Engineer
A SCADA Engineer designs, implements, and maintains Supervisory Control and Data Acquisition (SCADA) systems used to monitor and control industrial processes, including power systems. This course may be useful to a SCADA Engineer as SCADA systems often integrate protection and control data from high voltage stations. The knowledge of System Faults, Switchyard Configuration, and Dynamic Monitoring Equipment provides a SCADA Engineer with a better understanding of the data being transmitted and processed. Also, knowing about High Voltage Circuit Breakers and their performance characteristics can aid in the development of more effective monitoring and control algorithms.
Power Grid Automation Specialist
A Power Grid Automation Specialist works on integrating and automating various aspects of the power grid, including protection and control systems. This course may be useful, especially the content related to modern Intelligent Electronic Device (IED) relays. A Power Grid Automation Specialist can leverage this knowledge to better integrate advanced relaying functions into automated systems. Understanding System Faults, Switchyard Configuration, and Dynamic Monitoring Equipment offers valuable context for designing automation strategies that enhance grid reliability and resilience. Also, a Power Grid Automation Specialist gets to understand High Voltage Circuit Breakers.
Transmission Planning Engineer
A Transmission Planning Engineer plans and designs high voltage transmission systems to ensure reliable and efficient power delivery. This course may be useful for a Transmission Planning Engineer, particularly the sections covering System Faults and Switchyard Configuration. Understanding these concepts helps a Transmission Planning Engineer assess the impact of faults on system stability and design appropriate protection schemes. The knowledge of High Voltage Circuit Breakers and their control mechanisms, as well as the limitations imposed by CT saturation, contributes to more effective system planning. Furthermore, the course's coverage of Dynamic Monitoring Equipment helps plan for advanced monitoring and control capabilities.
Electrical Project Manager
An Electrical Project Manager oversees the planning, execution, and completion of electrical engineering projects. This course may be useful for an Electrical Project Manager working on projects involving high voltage power systems. While the role doesn't require in-depth technical expertise, this course on System Faults and Switchyard Configuration can help the Project Manager understand the technical aspects of the project, like HV Bus Differential Protection and CT saturation. The knowledge of High Voltage Circuit Breakers and their control mechanisms, as well as Dynamic Monitoring Equipment, provides a better understanding of project requirements.
Power System Operator
A Power System Operator monitors and controls the flow of electricity through the power grid. This course may be useful for operators who work with high voltage systems. The course provides an understanding of System Faults and Switchyard Configuration. Knowing the characteristics of High Voltage Circuit Breakers and their control systems aids operators in responding to system disturbances and maintaining grid stability. The course helps operators to understand the protective actions that are triggered by various system conditions.
Power Electronics Engineer
A Power Electronics Engineer designs and develops electronic circuits and systems for power conversion and control. This course may be useful for a Power Electronics Engineer working on projects related to high voltage direct current transmission or flexible alternating current transmission systems. The knowledge of system faults and switchyard configuration helps in designing protective circuits for power electronic devices. The discussion on High Voltage Circuit Breakers and their controls may be helpful for implementing circuit protection schemes. Also, knowing about Dynamic Monitoring Equipment is useful in designing control and monitoring systems for power electronic converters.

Reading list

We've selected two books that we think will supplement your learning. Use these to develop background knowledge, enrich your coursework, and gain a deeper understanding of the topics covered in Protection and Control of High Voltage Power Circuits.
Comprehensive guide to protective relaying principles and their applications in power systems. It covers a wide range of topics, including fault analysis, relay characteristics, and protection schemes for various power system components. This book is commonly used as a textbook in academic institutions and by industry professionals. It provides in-depth knowledge and practical examples that complement the course material.
Provides a detailed treatment of power system relaying, covering both electromechanical and digital relays. It delves into the theoretical foundations of relaying and provides practical guidance on relay selection, application, and testing. This book valuable resource for engineers involved in the design, operation, and maintenance of power system protection systems. It offers a more advanced perspective on the topics covered in the course.

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