Over current relay for 50-200hz feeder
Over current relay for 50-200hz feeder
(OP)
Hi All,
I have a feeder supplied from variable frequency drive (50 -200Hz). This feeder needs a overcurrent protection. But digital relays are not able to provide protection for varialbe frequencies (50-200)Hz.
Is electro-mechanical relay suitable for variable frequencies ? Or what other options to protect this feeder ?
I have a feeder supplied from variable frequency drive (50 -200Hz). This feeder needs a overcurrent protection. But digital relays are not able to provide protection for varialbe frequencies (50-200)Hz.
Is electro-mechanical relay suitable for variable frequencies ? Or what other options to protect this feeder ?






RE: Over current relay for 50-200hz feeder
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Take a look at the WD5051. "WD5051 AC current sensing relays provide current monitoring and protection in AC systems from 50 to 400 Hz."
RE: Over current relay for 50-200hz feeder
RE: Over current relay for 50-200hz feeder
Unless the VFD manufacturer has tested the operation of their product with a specific relay (or vice versa), you can't be certain that the two will play well together.
What leads you to believe that the VFD's built in protection is insufficient for your application?
RE: Over current relay for 50-200hz feeder
Thank you for valueable inputs. I was in same line with you guys to use the in built protection of VFD but client was insisting to put extra protection.
However, once you get 200Hz in your feeder,What is a problem to use WD5051 AC current sensing relays as suggested by JG2828.
RE: Over current relay for 50-200hz feeder