Engineering ToolBox - Resources, Tools and Basic Information for Engineering and Design of Technical Applications!

This is an AMP page - Open full page! for all features.

Heat Loss from Electrical Equipment

Heat loss from electrical equipment like switch gear, transformers and variable frequency drives

Sponsored Links

Heat loss to the ambient air from some typical electrical equipment are indicated below: 

Transformers

Transformers are in general highly efficient and large power transformers - 100 MVA and larger - can be more than 99% efficient. Smaller transformers - like used in consumer electronics - may be less than 85% efficient.

Heat loss for

  • 150 kVA and smaller : 50 Watts/kVA  (aprox. 5%)
  • 150 - 500 kVA : 30 Watts/kVA (aprox. 3%)
  • 500 - 1000 kVA : 25 Watts/kVA (aprox. 2.5%)
  • 1000 - 2500 kVA : 20 Watts/kVA (aprox. 2%)
  • larger than 2500 kVA : 15 Watts/kVA (aprox. 1.5%)

Switch Gear - Circuit Switch Breakers

  • Low voltage breaker 0-40 Amps : 10 Watts
  • Low voltage breaker 50-100 Amps : 20 Watts
  • Low voltage breaker 225 Amps : 60 Watts
  • Low voltage breaker 400 Amps : 100 Watts
  • Low voltage breaker 600 Amps : 130 Watts
  • Low voltage breaker 800 Amps : 170 Watts
  • Low voltage breaker 1600 Amps : 460 Watts
  • Low voltage breaker 2000 Amps : 600 Watts
  • Low voltage breaker 3000 Amps : 1100 Watts
  • Low voltage breaker 4000 Amps : 1500 Watts
  • Medium voltage breaker/switch 600 Amps : 1000 Watts
  • Medium voltage breaker/switch 1200 Amps : 1500 Watts
  • Medium voltage breaker/switch 2000 Amps : 2000 Watts
  • Medium voltage breaker/switch 2500 Amps : 2500 Watts

Motor Control Centers

  • Section : 500 Watts per section
  • Low voltage starters size 00 : 50 Watts
  • Low voltage starters size 0 : 50 Watts
  • Low voltage starters size 1 : 50 Watts
  • Low voltage starters size 2 : 100 Watts
  • Low voltage starters size 3 : 130 Watts
  • Low voltage starters size 4 : 200 Watts
  • Low voltage starters size 5 : 300 Watts
  • Low voltage starters size 6 : 650 Watts
  • Medium voltage starters size 200 Amp : 400 Watts
  • Medium voltage starters size 400 Amp : 1300 Watts
  • Medium voltage starters size 700 Amp : 1700 Watts

Variable Frequency Drive

  • Variable frequency drive : 2 - 6% of kVA rating
  • Bus duct : 0.015 Watts /ft Amp
  • Capacitors : 2 Watts / KVAR
Sponsored Links

Related Topics

Related Documents

Sponsored Links

Share

Search Engineering ToolBox

  • the most efficient way to navigate the Engineering ToolBox!

SketchUp Extension - Online 3D modeling!

Add standard and customized parametric components - like flange beams, lumbers, piping, stairs and more - to your Sketchup model with the Engineering ToolBox - SketchUp Extension - enabled for use with the amazing, fun and free SketchUp Make and SketchUp Pro .Add the Engineering ToolBox extension to your SketchUp from the Sketchup Extension Warehouse!

Privacy

We don't collect information from our users. Only emails and answers are saved in our archive. Cookies are only used in the browser to improve user experience.

Some of our calculators and applications let you save application data to your local computer. These applications will - due to browser restrictions - send data between your browser and our server. We don't save this data.

Google use cookies for serving our ads and handling visitor statistics. Please read Google Privacy & Terms for more information about how you can control adserving and the information collected.

AddThis use cookies for handling links to social media. Please read AddThis Privacy for more information.

Topics

Unit Converters

Temperature

oC
oF


Load Calculator!

Length

m
km
in
ft
yards
miles
naut miles


Load Calculator!

Area

m2
km2
in2
ft2
miles2
acres


Load Calculator!

Volume

m3
liters
in3
ft3
us gal


Load Calculator!

Weight

kgf
N
lbf


Load Calculator!

Velocity

m/s
km/h
ft/min
ft/s
mph
knots


Load Calculator!

Pressure

Pa (N/m2)
bar
mm H2O
kg/cm2
psi
inches H2O


Load Calculator!

Flow

m3/s
m3/h
US gpm
cfm


Load Calculator!

11 15

This website use cookies. By continuing to browse you are agreeing to our use of cookies! Learn more