Low voltage protection relay coordination

2 hours


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This course aims to give a comprehensive up-to-date presentation of the role of protection safety systems in low voltage grids. You will learn the essentials of electrical protection design, relay coordination, and protection selectivity. During the course, real-life examples of commonly faced issues will be shown.

About this course

Proper protection is needed to isolate the faulted region from the rest of the network. When multiple protective devices are installed in series, they have certain characteristics, that provide a specific operating order. Relay coordination study is important in protection system design. It must ensure fast, selective, and reliable relay operation to cut off the faulted sections of the power system. The main goal of protective relay coordination is to obtain selectivity without losing quick fault clearance time and sensitivity.

In this course, you will learn about the essentials of electrical protection design, relay coordination, and measurement devices used for relaying. Real-life examples will be shown to help you understand the most prevalent issues faced, and how to solve them. After the course, you will understand everything that must be known about relay coordination in low voltage networks.

Calculations will be performed with a power system modeling software EA-PSM Electric. Learn more about the software.


Who should attend this seminar?

  • Electrical Engineers, and Electrical Maintenance Personnel
  • Consulting Electrical Engineers
  • Project Engineers
  • Design Engineers
  • Field Technicians
  • Electrical Technicians
  • Plant Operators
  • Plant Engineers
  • Electrical Supervisors


The course consists of:

  1. Automatic short circuit calculation, protection equipment settings calculation, and sensitivity assessment;
  2. Low voltage fuses selection;
  3. Low voltage breakers selection and coordination;
  4. Protection coordination (overcurrent relays, ground fault relays, coordination of fuses and breakers tripping curves);
  5. How should the protection coordination report look like?


What will you learn?

  • Understand Functions of Protection Relays
  • Recognize the Key Protection Relay Selection Factors
  • Fault Analysis and Overvoltage Assessment
  • Current and Voltage Transformer Basics
  • Protection Relay Selection Factors
  • Protective Types of Relays
  • Where Protection Relays are applied
  • Applications and Considerations
  • Characteristics of Protective Relays
  • Selection of low voltage Fuses
  • Selection and Coordination of low voltage Breakers
  • Coordination of fuses and breakers tripping curves
  • Characteristics of maximum short circuit current protection devices in medium voltage networks
  • Protection equipment against maximum short circuit currents settings calculation and sensitivity assessment
  • Protection equipment against phase-to-neutral short circuits settings calculation and coordination


Additional information:

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