GE Multilin 750

Other settings
52 750/760 Quick Reference Guide
1. Select the Setpoints > S4 Output Relays > 3 Auxiliary menu item. The following
window will appear:
2. Change the corresponding setpoints as indicated, then press Save.
Changing setpoint groups
All setpoints contained under the S5 PROTECTION setpoints page are available in a set of
four groups, identified as Groups 1, 2, 3, and 4. These multiple setpoints provide the
capability of both automatic and manual changes to protection settings for different
operating situations. Automatic (adaptive) protection setpoint adjustment is available to
change settings when the power system configuration is altered. By monitoring the state of
a bus tiebreaker on the bus connected to the associated feeder breaker, different settings
may be used depending the tiebreaker state.
Automatic group selection can be initiated by use of a logic input. The manual adjustment
capability is available for those users who use different settings for different seasons of the
year. Manual group selection can be initiated from the keypad or via communications.
The following example illustrates how the 750/760 relay can be set to change setpoint
groups in response to Logic Input #8.
To define the logic Input, enter the following values in the S3 LOGIC INPUTS
ZV LOGIC
INPUTS SETUP setpoints page. Using the message keys, find the appropriate logic input
name message and then the asserted logic to complete the logic input definition as follows.
INPUT 8 NAME: “Change Setting Gr”
INPUT 8 ASSERTED LOGIC: “Contact Close”
Once the logic input definitions are completed, enter the following values in the S3 LOGIC
INPUTS
ZV CONTROL FUNCTIONS setpoint page to define their functionality. Using the
message keys, find the appropriate logic function message and select the corresponding
logic input that will be used to perform the function.
SETPOINT GROUP 2: “Input 8”
By doing this, the relay will change to Setpoint Group 2 when Logic Input #8 is asserted.
Using the EnerVista 750/760 Setup software, the same setpoints can be changed as
follows.