Protective Relays & Trips Devices: Practical, Application & Troubleshooting

Protective Relays & Trips Devices: Practical, Application & Troubleshooting

OBJECTIVES

• Knowing the fault reasons in electrical networks and Its effect on the electrical quantities.
• Reviewing the Grounding System of generation, Transmission and Distribution Networks and how it affects the electrical quantities, short circuit level and protection system.
• Understanding main concepts of protection equipment and its necessity in electrical System.
• How to make relay coordination for main and back-up protection relays on the network.
• How to find the cause of relay operation and verify if it is correct, falls or mal operation
• How to protect the power system due to abnormal operational conditions.

WHO SHOULD ATTEND?

This course is intended for Engineers & supervisors who work in transmission, distribution, maintenance, operation, control and analysis of Electrical Networks.

COURSE OUTLINE

DAY 1

Introduction to power system relaying (PSP)

• Importance of Protective Relays
• Definitions.
• Requirements of PS

 Overview

• Power System Components
• Arrangement of Grounding in Power System
• Short circuit Calculations
• Transformer Connections

DAY 2

Fuses

Current & Voltage Transformers

Protective Relays

• DTOC, IDMT, VIDMT, EIDMT Relays
  • Time Current Characteristic Curves
  • Choice Between DTOC & IDMT (Short & Long Lines)
• Hi-Set Instantaneous Over Current Relays Combined With DTOC & IDMT

Directional & Non-Directional  overcurrent & Earthfault Relays

DAY 3

Coordination of Protective Devices

• Fuse to Relay Coordination Time Intervals
• Relay to Relay Coordination Time Intervals

Applications & Examples

Working on Complete Coordination System

Determining relays Settings

In-class Exercises

DAY 4

Differential Relays (D.R.)

• Main Principles & Applications.
• Connections.
• Bias relay.
• Restricted earth fault relay (R.E/F.R.)
• Numerical Examples

Impedance Relays

• Main Principles & Applications
• Connections & Characteristics.
• Coordination.

DAY 5

Applications & Examples On Protection of:

• Motor
• Generator
• Substation
• Transmission lines
• Distribution Network