How to Connect to a GE DGP Relay with Testing Tips

GE DGP Relay

http://www.geindustrial.com/cwc/products?famid=31&lang=en_US

DGP:

http://www.geindustrial.com/cwc/products?pnlid=6&famid=31&catid=168&id=dgp&lang=en_US
Cable: 9-pin to 9-pin RS-232 Null Modem
Software: EnerVista DGP http://www.geindustrial.com/publibrary/checkout/38652.30055.2305.32176/SW%20Executable/dgpsetup10.exe

Software Default Settings

Unit ID (Address): 0
Real-Time Data Update rate: 2
Granular Timeout: 150
No. of Retries: 5
Switch Code:
Termination Code:
Baud Rate: 9600 (or 2400)
Parity: None
Stop Bits: 1
Data Bits: 8
Modem Init String:

Passwords & Connection Info

Model: From right side of case or on top middle on newer relays
Password: CTRL or SETT or VIEW . You might need to add an “.” or “!” to the end and change the password

Don’t spend a lot of time on communication, it is hit and miss. If it doesn’t work, press [ACT] button on front panel, scroll to “Enter Password” and type “1234.” Or “5678.” And enter settings manually. Hit [END] and [ENT] after last setting entry to save.

Testing Tips

  1. 87 Differential Protection needs neutral current input from residual current to operate!!!! Connect CT connections 2-4-6-7 and connect return to terminal 8
  2. 59 requires 3 phase to operate properly
  3. When testing VTFF, Current should be >0.1 but < 87G Pickup Setting
  4. The solid-state trip outputs may bleed too much voltage when the contact are open and your test-set may indicate that they are closed when they are actually open. Look for voltage sensing controls in your test-set configuration and manipulate those numbers to get actual indication.  Otherwise use the alarm contacts to do your testing and prove the in-service contacts change state correctly with a fluke.

 

 

About the Author Chris Werstiuk

Chris is an Electrical Engineering Technologist, a Journeyman Power System Electrician, and a Professional Engineer. He is also the Author of The Relay Testing Handbook series and founder of Valence Electrical Training Services. You can find out more about Chris here.

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