Class 5 Brief Introduction to Non Directional Overcurrent Protection

Описание: The objective of this class in to present a very short a brief discussion about non-directional overcurrent protection with emphasis at distribution feeder protection.
Agenda:
Introduction to Overcurrent (OC) protection
Fuse
Recloser
Sectionalizers
OC Relay
Instantaneous OC relay and Definite-time OC Relay
Inverse Time OC Relay
Standard Inverse Definite Minimum Time (IDMT)
Examples 1, 2 and 3
Principles of Time/CurrentGrading
A. Discrimination by Time
B. Discrimination by Current
C. Discrimination by both Time and Current
Co-ordination Procedure
Application of Definite Time OC Relays for Protection of a Distribution Feeder
Application of Inverse Definite Minimum Time Relays for Protection of a Distribution Feeder
Example 4
Summary

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