GE TRANSFORMER MANAGEMENT RELAY 745 Instruction Manual page 119

5 SETPOINTS
• MINIMUM OPERATING CURRENT: Enter the minimum value of Winding 1 Phase A current (in units of relay nominal
current) required to allow the underfrequency element to operate.
• MINIMUM OPERATING VOLTAGE: Enter the minimum value of voltage (in units of relay nominal voltage) required to
allow the underfrequency element to operate.
• UNDERFREQUENCY 1(2) PICKUP: Enter the frequency (in Hz) below which the Underfrequency 1 element will
pickup and start the delay timer.
• UNDERFREQUENCY 1(2) DELAY: Enter the time the frequency remains below the pickup level before element oper-
ation.
GE Multilin
Courtesy of NationalSwitchgear.com
Figure 5–29: UNDERFREQUENCY 1 SCHEME LOGIC
745 Transformer Management Relay
5.6 S4 ELEMENTS
5
5-69