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

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

Electric transformer

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

Circuit switch breaker

  • 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

Electric motor starter

  • 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

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

Related Topics

  • Air Conditioning

    Air Conditioning systems - heating, cooling and dehumidification of indoor air for thermal comfort.

Related Documents

Sponsored Links

Search

Search is the most efficient way to navigate the Engineering ToolBox.

Engineering ToolBox - SketchUp Extension - Online 3D modeling!

3D Engineering ToolBox Extension to SketchUp - add parametric components to your SketchUp model

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 older versions of the amazing SketchUp Make and the newer "up to date" SketchUp Pro . Add the Engineering ToolBox extension to your SketchUp Make/Pro from the Extension Warehouse !

Translate this Page

Translate this page to Your Own Language .

About the Engineering ToolBox!

Privacy Policy

We don't collect information from our users. More about

Citation

This page can be cited as

  • The Engineering ToolBox (2010). Heat Loss from Electrical Equipment . [online] Available at: https://www.engineeringtoolbox.com/heat-gain-equipment-d_1668.html [Accessed Day Month Year].

Modify the access date according your visit.

3D Engineering ToolBox - draw and model technical applications! 2D Engineering ToolBox - create and share online diagram drawing templates! Engineering ToolBox Apps - mobile online and offline engineering applications!

Unit Converter

















































2.27.11

Sponsored Links
.