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Protective Relay Info Needed - IJ7 Differential

Protective Relay Info Needed - IJ7 Differential

Protective Relay Info Needed - IJ7 Differential

(OP)
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.

RE: Protective Relay Info Needed - IJ7 Differential

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

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