GE Industrial Solutions Entellisys System User Manual - Manual (Page 80)

Single point functions 80
5
5.3.2 Setup
To set the settings for the Synch Check Relay
1. On the Main Menu, click User Settings, and then select Control.
2. On the Control screen, click Synch Check.
The remainder of this section discusses the parameters that can be set in the Synch Check
section of the Control screen as shown in Figure 5-12.
The following settings must be set for the Synch Check Relay:
Synch Check Function: Choose the synch check relay number from the Synch Check Function
drop-down menu.
Relay Name: Assign a name for identifying the relay.
Relay Enabled: Select Enable to enable the relay.
5.3.2.1 Source voltages
First: Select the circuit breaker number that provides the voltage for source 1 from the First
drop-down menu in the Source Voltages menu group.
Second: Select the circuit breaker number that provides the voltage for source 2 from the
Second drop-down menu in the Source Voltages menu group.
5.3.2.2 Maximum differentials
Voltage: Adjust the maximum voltage differential allowed between source voltages for the
synch check function to operate from 0 to 90 V in steps of 0.5 V from the Voltage drop-down
menu in the Maximum Differentials menu group.
Frequency: Adjust the maximum frequency differential allowed between source voltages for
the synch check function to operate from 0 to 2 Hz in steps of 0.1 Hz from the Frequency
drop-down menu.
Phase: Adjust the maximum phase differential allowed between source voltages for the synch
check function to operate from 0 to 60 degrees in steps of 1 degree from the Phase drop-down
menu.
The Synch Check function applies a 3% hysteresis factor to the voltage, frequency, phase, live
bus and dead bus thresholds.
5.3.2.3 Source 1
Dead Bus Threshold: Adjust the threshold below which a phase is considered dead from 5 to
50% of the nominal voltage (line-neutral for wyes, line-line for deltas) in steps of 1% from the
Dead Bus Threshold drop-down menu in the Source 1 menu group.
Live Bus Threshold: Adjust the threshold above which a phase is considered live from 50% to
100% of the nominal voltage (i.e., the PT rating, line-neutral for wyes, line-line for deltas) in steps
of 1% from the Live Bus Threshold drop-down menu in the Source 1 menu group.