The IET is carrying out some important updates between 17-30 April and all of our websites will be view only. For more information, read this Announcement

Rules and Guidelines
Want to participate in the discussions? Please read our Community Rules and Guidelines. Need some help? Visit Support and Answers.

  • State Not Answered
  • Locked Locked
  • Replies 14 replies
  • Subscribers 31 subscribers
  • Views 2636 views
  • Users 0 members are here
Options
You may also be interested in
This discussion is locked.
You cannot post a reply to this discussion. If you have a question start a new discussion

Neutral Point of Heater Bank

FornhamSpark
Hi,

I have an application to control a bank of resistive heating elements (52Kw) in a Star configuration from a Eurotherm Power Management unit to control heat output.

Is it standard practice to connect the Neutral Point to Neutral ?
Parents
  • 0

    Assuming the heating elements are resistive loads, there are three basic single-fault failure modes:



    May I add a fourth - or a subdivision of (a) if you prefer - where several individual elements are connected in parallel on each phase. (probably not unlikely for a 52kW unit),  If one element fails open circuit the current on that phase drops and the star point moves towards the other two phase (towards, the point where the elements on the other two phases would see 200V, but not quite), The remaining elements on the phase with the faulty element then see an increased voltage and start to overheat (with probably undesirable consequences). At least I think that was Geoff's example.


      - Andy.
Reply
  • 0

    Assuming the heating elements are resistive loads, there are three basic single-fault failure modes:



    May I add a fourth - or a subdivision of (a) if you prefer - where several individual elements are connected in parallel on each phase. (probably not unlikely for a 52kW unit),  If one element fails open circuit the current on that phase drops and the star point moves towards the other two phase (towards, the point where the elements on the other two phases would see 200V, but not quite), The remaining elements on the phase with the faulty element then see an increased voltage and start to overheat (with probably undesirable consequences). At least I think that was Geoff's example.


      - Andy.
Children
No Data

Join us to get the best from IET EngX.

Joining EngX lets you personalise your experience so you stay up to date on the topics that interest you, plus you’ll be able to make connections who are looking to collaborate, exchange ideas and more.

Join us Not now

Community Rules & Guidelines