GE Industrial Solutions Entellisys 5.0 User Manual - Manual (Page 101)

Advanced Protection Relays 101
5
5.3.4 High Current Flex Relay
The High Current Flex Relay is a collection of 16 breaker independent relays. The High Current
Flex Relay is very similar to the High Current Relay (see
High Current Relay on page 87 ).
As with the High Current Relay, the flex relay compares each of the phase currents and if any of
the currents exceed the pickup for more than the programmed delay, the system activates an
alarm. The alarm can be read by FlexLogic or on the HMI Alarm Screen.
The alarm can be in three states:
•
Pickup – If the current in any phase is more than the pickup set point, the alarm goes into
pickup.
•
Operate – If the alarm stays in pickup state for the selected pick up delay time, the system
activates an alarm.
•
Drop out – The alarm drops out of pickup when the current drops below 97% of the
programmed threshold.
The High Current Flex Relay can be adjusted from 10% to 200% of the Long Time Protection
pickup setting, in increments of 5%. The high current delay setting can be adjusted from 1 to 15
seconds in steps of 1 second. The relay can be suspended through FlexLogic.
5.3.4.1 Accuracy
Pickup accuracy is ± 10%.
5.3.4.2 Setup
To set the alarm settings for the High Current Flex Relay
1. On the Main Menu, click User Settings, and then select Advanced Protection.
2. Click on High Current Flex and choose the relay number from the drop-down menu.
5.3.4.3 Settings
Relay Selection: Select the relay instance (1 - 16)
Enabled: Select Enabled to enable the alarm.
Breaker Selection: Select the breaker which will be associated with the alarm shown in the
Relay Selection.
Pickup Setting: Adjust the high current pickup from 10% to 200% in increments of 5% of the
long time setting.
Time Delay: Adjust the high current delay from 1 to 15 seconds in increments of 1 second.
NOTE: The High Current Flex Relay cannot trip a breaker directly. It is a protection element in
FlexLogic and can be programmed to trip a breaker.