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Generator Derating Guide

This document outlines steps to calculate derate requirements for generator sizing based on steady state conditions. It provides charts showing altitude, temperature, and power factor derate multipliers, with notes explaining a 3% derate for every 500m above 1000m altitude or every 5°C above 40°C temperature, and that derate multipliers are cumulative if more than one applies.

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PowerTech
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329 views1 page

Generator Derating Guide

This document outlines steps to calculate derate requirements for generator sizing based on steady state conditions. It provides charts showing altitude, temperature, and power factor derate multipliers, with notes explaining a 3% derate for every 500m above 1000m altitude or every 5°C above 40°C temperature, and that derate multipliers are cumulative if more than one applies.

Uploaded by

PowerTech
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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GENERATOR SIZING PROCEDURE

STEP 2. CALCULATE ANY DERATE REQUIREMENTS FOR STEADY STATE

ALTITUDE DERATE TEMPERATURE DERATE POWER FACTOR DERATE


4500 60 0.1

POWER FACTOR COS Φ


ALTITUDE IN METRES

4000 0.2

TEMPERATURE IN ºC
55
3500 0.3

3000 0.4
50
2500 0.5

2000 45 0.6

1500 0.7

1000 40 0.8
1.0 0.95 0.9 0.85 0.8 1.0 0.95 0.9 0.85 1.0 0.95 0.90 0.85
DERATE MULTIPLIER DERATE MULTIPLIER DERATE MULTIPLIER

 NOTE 1 : A DERATE of 3% is required for every 500m above 1000m ASL.


 NOTE 2 : A DERATE of 3% for every 5°C above 40 °C at the GENERATOR AIR INTAKE .
 NOTE 3 : POWER FACTOR DERATE refers to LAGGING P.F.
 NOTE 4 : DERATE MULTIPLIERS are CUMULATIVE , (if more than one derate applies).

PRODUCT TRAINING

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