Philosophy of OVERCURRENT RELAY COORDINATION IN SUB STATION

Name: Philosophy of OVERCURRENT RELAY COORDINATION IN SUB STATION
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RELAY COORDINATION FOR OVERCURRENT RELAY

Created byRelay Protection Electrical

Last updated 6/2024

English

English [Auto],

What you'll learn

OVERCURRENT RELAY CO-ORDINATION IN A SUB STATION
RELAY COORDINATION, TMS CACCULATION
Overcurrent Relay TMS CALCULATION FOR RELAY COORDINATION
Fault Calculation and Trip Time
Protection Coordination in a Sub Station

Course content

1 section • 5 lectures • 52m total length

Introduction5:29
Explain overcurrent relay coordination in a substation using IDMT characteristics. Analyze feeder to bus coupler to LV and HV side relays and grading margins for selective tripping.
Case-I: Basic of Overcurrent Relay Coordination in a Sub Station4:56
Analyze basics of overcurrent relay coordination in a 132 by 33 kV substation, covering transformer impedance, CT ratios, bus coupler and feeder protection, and delay sequencing.
IDMT IEC Standard Inverse Curve Characteristics3:20
Explain the IEC standard inverse curve for three seconds in IDMT relays, and how PSM and TMS set trip time via the inverse formula for overcurrent coordination in a substation.
Case-1 : Overcurrent Relay Coordination for Two Nos Transformer running Parallel21:18
Explains overcurrent relay coordination for a 132/33 kV substation with two parallel transformers, detailing fault calculation, bus coupler, and staged time margins to ensure selective tripping.
Case-2 : Overcurrent Relay Coordination When Only One Transformer is Running17:55
Explain how one running transformer and bus coupler coordination affect fault current distribution and how to set tms for feeder, bus coupler, and transformer overcurrent relays using iec inverse curves.

Requirements

Basic Knowledge of Electrical Engineering

Description

After going through this course You will be able to understand how Relay Coordinator is done for IDMT Over current Relay in a Sub Station. A simple example has been taken with two nos 132/33 KV 50 MVA Transformer and in 33 KV System two nos of Feeders with One Bus Coupler CB has been considered. After going through this course viewers will be easily calculate TMS setting for OC Relay from Feeder to Bus Coupler to the LV Side of Transformer and to the HV Side of Transformer and hence how Relay Coordination is done for OC Relay in a Particular Sub Station. Here the Fault MVA for 132 KV Bus has been considered as 1000 MVA and %Impedance for Transformer is 10% each. CT Ratio for HV Side and LV side of Transformer are 400/1 and 1000/1 respectively and for BC and Feeder are 800/1 and 400/1 respectively. Time Margin has been considered for trip time from Feeder to BC to LV Side OC Relay to HV Side OC Relay. Two cases has been considered, one: considering two nos transformers are running under parallel condition and Case-2: One no. of Transformer is under Shuw down and other is running.

Who this course is for:

Electrical Engineer, technician working in Industries, Students