GE TRANSFORMER MANAGEMENT RELAY 745 Instruction Manual page 122

5.6 S4 ELEMENTS
• MINIMUM OPERATING CURRENT: Enter the minimum value of Winding 1 Phase A current (in units of relay nominal
current) required to allow the overfrequency 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.
• OVERFREQUENCY PICKUP: Enter the frequency (in Hz) above which the overfrequency element will pickup and
start the delay timer.
• OVERFREQUENCY DELAY: Enter the time that the frequency must remain above the pickup level before the element
operates.
5
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Courtesy of NationalSwitchgear.com
Figure 5–31: OVERFREQUENCY SCHEME LOGIC
745 Transformer Management Relay
5 SETPOINTS
GE Multilin