CT & PT designed for 60Hz on 50Hz power supply 1

[sykimk]

Hello,

I have CT & PT designed for 60Hz system and tested per ANSI/IEEE standards but those will be used on 50Hz power system.
If so, are there any advices on this issues? I guess CT & PT burden should be derated accordingly and CT saturation will be faster than the same CT in 60Hz. Did I correctly understand?

If those 60Hz CT & PTs are used for protection system on 50Hz power supply, any advices on protection settings?

Thanks in advance for your advices.

 

[scottf]

The CTs will probably be ok, especially if you reduce the burden under the rated burden.

However, it is not advisable to us 60 Hz PTs on the 50 Hz system due to saturation concerns.

 

[sykimk]

scottf/
Appreciate your comment. Do you know how CT's magnetizing current will be changed if 60Hz CT is running on 50Hz? How will it affect protection settings?

 

[scottf]

Yes, flux density will be 1/6th higher. If you downgraded the protection rating/burden by 1/6th (17%) you should be ok.

I have to say though...best option is to buy correctly rated units...especially if these are being used for protection.