GE TRANSFORMER MANAGEMENT RELAY 745 Instruction Manual page 120

5.6 S4 ELEMENTS
c) FREQUENCY DECAY
PATH: SETPOINTS S4 ELEMENTS
FREQUENCY DECAY
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5
• MINIMUM OPERATING CURRENT: Enter the minimum value of Winding 1 Phase A current (in units of relay nominal
current) required to allow the frequency decay 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.
• FREQUENCY DECAY THRESHOLD: Enter the frequency (in Hz) below which the four frequency rate-of-change lev-
els of the frequency decay element will be allowed to operate.
• FREQUENCY DECAY RATE 1(4): Enter the rate of frequency decay beyond which the corresponding element oper-
ates.
5-70
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FREQUENCY FREQUENCY DECAY
ð
FREQUENCY DECAY
ENTER
FUNCTION: Disabled
ESCAPE
FREQUENCY DECAY
ESCAPE
TARGET: Self-Reset
MESSAGE
CURRENT SENSING:
ESCAPE
Enabled
MESSAGE
MINIMUM OPERATING
ESCAPE
CURRENT: 0.20 x CT
MESSAGE
MINIMUM OPERATING
ESCAPE
VOLTAGE: 0.50 x VT
MESSAGE
FREQUENCY DECAY
ESCAPE
THRESHOLD: 59.50 Hz
MESSAGE
FREQUENCY DECAY
ESCAPE
DELAY: 0.00 s
MESSAGE
FREQUENCY DECAY
ESCAPE
RATE 1: 0.4 Hz/s
MESSAGE
FREQUENCY DECAY
ESCAPE
RATE 2: 1.0 Hz/s
MESSAGE
FREQUENCY DECAY
ESCAPE
RATE 3: 2.0 Hz/s
MESSAGE
FREQUENCY DECAY
ESCAPE
RATE 4: 4.0 Hz/s
MESSAGE
FREQUENCY DECAY
ESCAPE
BLOCK: Disabled
MESSAGE
745 Transformer Management Relay
Range: Enabled, Disabled
Range: Self-Reset, Latched, None
Range: Enabled, Disabled
Range: 0.20 to 1.00 x CT in steps of 0.01
Range: 0.10 to 0.99 x CT in steps of 0.01
Range: 45.00 to 59.99 Hz in steps of 0.01
Range: 0.00 to 600.00 s in steps of 0.01
Range: 0.1 to 5.0 Hz/s in steps of 0.1
Range: 0.1 to 5.0 Hz/s in steps of 0.1
Range: 0.1 to 5.0 Hz/s in steps of 0.1
Range: 0.1 to 5.0 Hz/s in steps of 0.1
Range: Logc Inpt 1 to 16, Virt Inpt 1 to 16, Output Rly 2 to
8, SelfTest Rly, Vir Outpt 1 to 5, Disabled
5 SETPOINTS
GE Multilin