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Incomer - 1

The document outlines the relay setting calculations for an incomer transformer rated at 7.5MVA with specific current and voltage protection settings. It includes parameters for overcurrent, earth fault, under voltage, and over voltage protection with detailed current set values and time delays. The settings are designed to ensure the safe operation of the transformer under various electrical conditions.

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3 views2 pages

Incomer - 1

The document outlines the relay setting calculations for an incomer transformer rated at 7.5MVA with specific current and voltage protection settings. It includes parameters for overcurrent, earth fault, under voltage, and over voltage protection with detailed current set values and time delays. The settings are designed to ensure the safe operation of the transformer under various electrical conditions.

Uploaded by

bapivyb0bij0d3
Copyright
© © All Rights Reserved
We take content rights seriously. If you suspect this is your content, claim it here.
Available Formats
Download as PDF, TXT or read online on Scribd
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MM ENGINEERS

F – 428 SECTOR 63 NOIDA (UP) 201301


An ISO 9001:2015 Co.

Relay setting calculation for INCOMER – 1 [SST-1]

Parameters for transformer:-

Transformer rating : 7.5MVA, 220kV/33kV


Full load current (LV): 131.31A
Full load current (HV): 19.68A
CT RATIO:- 200/1A

51 OVERCURRENT
Direction Non Directional
I>Current Set A 0.72168784 110% of the rated Value
Function DT
Time Delay s 2
I>>Current Set A 0.78729582 120% of the rated Value
Function DT
Time Delay s 0.5

EARTH
51N FAULT
Direction Non Directional
IN>Current Set A 0.13121597 20% of the rated Value
Function DT
Time Delay s 2
IN>>Current Set A 0.19682396 30% of the rated Value
Function DT
Time Delay s 0.5

Voltage Protection
27 Under Voltage Phase‐Phase
Measurement Mode
80% of rated
Voltage Set V 88 Voltage
Time Delay s 5
MM ENGINEERS
F – 428 SECTOR 63 NOIDA (UP) 201301
An ISO 9001:2015 Co.

59 Over Voltage
Measurement Mode Phase‐Phase
Voltage Set V 121 110% of rated Voltage
Time Delay s 0.5

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