GE Industrial Solutions Entellisys 5.0 User Manual - Manual (Page 77)

Additional Relay Protection Packages 77
5
The accuracy of the blocking voltage depends on the frequency deviation and is listed in
Table 5-6.
5.2.3.2 Setup
To set the Trip and Alarm settings for the Over Frequency Relay
1. On the Main Menu, click User Settings, and then select Relay Protection.
2. On the Relay Protection screen, choose the circuit breaker number from the drop-down
menu and click Over Frequency.
The remainder of this section discusses the relay parameters that can be set in the Over
Frequency section of the Relay Protection screen as shown in Figure 5-7.
5.2.3.3 Trip settings
Relay Enabled: Select Enabled to enable the relay.
Pickup: Adjust the over frequency pickup from 50 to 70 Hz in increments of 0.1 Hz from the
Pickup Setting drop-down menu.
Delay: Adjust the over frequency delay from 0.1 to 600 seconds in increments of 0.1 seconds
from the Time Delay drop-down menu.
Blocking Voltage Enabled: Select Enabled in the Blocking Voltage section to enable the
blocking voltage. If the option is enabled, the blocking voltage setting is 10% of the nominal
voltage.
Open Trip: Select the command issued when the relay operates from the Open Trip drop-down
menu. Options are Open and don't activate lockout and Trip and activate lockout.
5.2.3.4 Alarm settings
Relay Enabled: Select Enabled to enable the relay.
Pickup: Adjust the over frequency pickup from 50 to 70 Hz in increments of 0.1 Hz from the
Pickup Setting drop-down menu.
Delay: Adjust the over frequency delay from 0.1 to 600 seconds in increments of 0.1 seconds
from the Time Delay drop-down menu.
Table 5-6 Blocking voltage accuracy
Frequency Deviation Blocking Voltage Accuracy
0 Hz ±2%
2 Hz ±5%
4 Hz ±7%
6 Hz ±10%
8 Hz ±13%
10 Hz ±15%