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Selecting the right protection for your transformer

  The choice of electrical protection for your transformer will depend on a number of things such as
  • The size of the transformer
  • The type of network it will be connected to (i.e. 3 or 4 wire system)
  • The importance of the function of your transformer
  • What is the cost impact of down time
  • The cost of the protection itself


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Nowadays, with the developement of multi function relays such as the CEE NP Range, or the Schneider Micom suite, most of the above functions are contained  in one relay. And in instances where not all of the functions are required it may still be cheaper to buy a multi function relay and simply set the non  required functions out of service.

So as you can see there are a number of things to consider. There are a number of PRAG's (Protection relay application guides) freely available on the net.  Click here to view the CEE Relay PRAG.

New website feature! Calculate your relay trip times

Why not use our new calculator feature to calculate the trip times of your overcurrent or thermal relays. Tripping curves based on the IEC formulas for all types of inverse curves.

Check out the latest range of ICE products from CEE Relays here

Check out the latest range of ISA manual and automatic test equipment here

Check out the latest Micom range from Schneider

Check out the latest REF range from ABB

Check out the latest NP800 range from CEE

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