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POWERAPPS
CASE STUDY

:

Protection Co-ordination Study

CLIENT NAME

:

A Multinational company who is the project supplier

END CUSTOMER

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Water Treatment Plant

PROJECT TITLE

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Protection Co-ordination Study for a Water Treatment Plant

INTRODUCTION
The primary function of protective devices in a power system is to detect short circuits and isolate the fault by activating the appropriate circuit interrupting devices, which increases the reliability and safety of the electrical system. The relay co-ordination study is required to select the protective devices and necessary settings so that circuit interrupter closest to the fault opens before other devices.

SCOPE OF WORK
Perform protective device co-ordination analysis for HV panels including 2 Nos HV incomer panel, 2 Nos 16 MVA, 33 kV/6.9 kV power transformer, 1 No bus coupler, 8 Nos +1 spare distribution transformers ( including LV side breaker of the transformers ), 5 +1 spare motor feeders etc and provide results and recommendations as required by the specification and client.

NETWORK DETAILS
Network was represented from 33 kV to last relay location at LV side. The Single Line Diagram is shown in the following figure. Network Single Line Diagram

www.kalkitech.com

Copyright © Kalki Communication Technologies Ltd .All Rights Reserved

The incomer transformer panel is equipped with a SEPAM 80 Series relay for integrated transformer protections as follows,


46- Unbalanced load protection relay



50-Instantaneous Over Current Relay



50N-Instantaneous Earth Fault Relay



51- Time Delayed Over Current Relay



51N-Time Delayed Earth Fault Relay



64REF-Restricted Earth Fault Relay



87T Transformer Differential Protection Relay

The 6.6kV Motor feeders are equipped with a SEPAM 80 Series relay for integrated motor protections as follows


12- Over Speed Relay



14- Under Speed Relay



27- Under Voltage Relay



References: 1. www.kalkitech.com/offerings/solutions-powerapps 2. http://www.powerapps.org/PAES_PSSystemStudies.aspx www.kalkitech.com Copyright © Kalki Communication Technologies Ltd .All Rights Reserved

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