GE TRANSFORMER MANAGEMENT RELAY 745 Instruction Manual page 129

5 SETPOINTS
c) HARMONIC DERATING
PATH: SETPOINTS S4 ELEMENTS
W1 HARM DERATING
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• MINIMUM OPERATING CURRENT: Enter the minimum value of current (in units of relay nominal current) required to
allow the Harmonic Derating element to operate.
• W1(3) HARMONIC DERATING PICKUP: Enter the harmonic derating below which the Winding 1(3) Harmonic Derat-
ing will pickup and start the delay timer.
• W1(3) HARMONIC DERATING DELAY: Enter the time that the harmonic derating must remain below the pickup level
before the element operates.
GE Multilin
Courtesy of NationalSwitchgear.com
HARMONICS W1(3) HARM DERATING
ð
W1 HARM DERATING
ENTER
FUNCTION: Disabled
ESCAPE
W1 HARM DERATING
ESCAPE
TARGET: Self-Reset
MESSAGE
MINIMUM OPERATING
ESCAPE
CURRENT: 0.10 x CT
MESSAGE
W1 HARM DERATING
ESCAPE
PICKUP: 0.90
MESSAGE
W1 HARM DERATING
ESCAPE
DELAY: 10 s
MESSAGE
W1 HARM DERATING
ESCAPE
BLOCK: Disabled
MESSAGE
Figure 5–35: HARMONIC DERATING SCHEME LOGIC
745 Transformer Management Relay
5.6 S4 ELEMENTS
Range: Enabled, Disabled
Range: Self-Reset, Latched, None
Range: 0.03 to 1.00 x CT in steps of 0.01
Range: 0.01 to 0.98 in steps of 0.01
Range: 0 to 60000 s in steps of 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
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