StephenSDH
Senior Member
- Location
- Allentown, PA
I support a system that heats molds using 32 zones of electrical heat. Each zone is contains several single phase heater strips on a 3 phase circuit. They have had many issues with the heaters going out and not knowing until they make bad product. I had the customer add current CTs to each phase with the signal going to a PLC. I am going to energize each zone one at a time and calculate the KW to detect a heater loss.
I thought the calculation would be easy until I got into it. Heater zones are 600V 3 Phase and fed from a delta-delta transformer. Zones may be single phase, balanced, or something in between.
If it is a single phase load or a balanced 3 phase load I can calculate the KW, but the in-between I am having a hard time coming up with the formula. If anyone can point me in the right direction I'd appreciate it.
Thanks, Steve
I thought the calculation would be easy until I got into it. Heater zones are 600V 3 Phase and fed from a delta-delta transformer. Zones may be single phase, balanced, or something in between.
If it is a single phase load or a balanced 3 phase load I can calculate the KW, but the in-between I am having a hard time coming up with the formula. If anyone can point me in the right direction I'd appreciate it.
Thanks, Steve