Protective Relay Info Needed - IJ7 Differential

[dpc]

I'm looking for any available info on some (probably) very old generator diff relays. These are called out as IJ7 (or IJ-7), but no manufacturer is listed.

I'm thinking these are old GE relays. I know GE made an IJD differential relay so these may have been a precursor. They are definitely being used for generator differential.

Based on the age of the facility, these could be quite old (70 years).

Any info would be appreciated.

 

[apowerengr]

Did you try GE's Multilin tech help line 800.547.8629 - they also provide assistance on the old stuff.