GE TRANSFORMER MANAGEMENT RELAY 745 Instruction Manual page 132

5.6 S4 ELEMENTS
c) AGING FACTOR LIMIT
PATH: SETPOINTS S4 ELEMENTS
AGING FACTOR LIMIT
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The Aging Factor Limit element provides a means of detecting when a transformer is aging faster than would normally be
acceptable. The element operates on the computed aging factor, which in turn is derived from the computed hottest-spot
value. The aging factor value will revert to zero if the power supply to the relay is interrupted. The necessary settings
required for this element to perform correctly are entered under:
• AGING FACTOR LIMIT PICKUP: Enter the Aging Factor required for operation of the element. This setting should be
above the maximum permissible aging factor under emergency loading condition and maximum ambient temperature.
• AGING FACTOR LIMIT DELAY: Enter a time delay above which the Aging Factor must remain before the element
5 operates.
5-82
Courtesy of NationalSwitchgear.com
INSULATION AGING
ð
AGING FACTOR LIMIT
ENTER
FUNCTION: Disabled
ESCAPE
AGING FACTOR LIMIT
ESCAPE
TARGET: Self-Reset
MESSAGE
AGING FACTOR LIMIT
ESCAPE
PICKUP: 2.0
MESSAGE
AGING FACTOR LIMIT
ESCAPE
DELAY: 10 min.
MESSAGE
AGING FACTOR LIMIT
ESCAPE
BLOCK: Disabled
MESSAGE
Figure 5–37: AGING FACTOR LIMIT SCHEME LOGIC
745 Transformer Management Relay
AGING FACTOR LIMIT
Range: Enabled, Disabled
Range: Self-Reset, Latched, None
Range: 1.1 to 10 in steps of 0.1
Range: 0 to 60000 min. 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 SETPOINTS
GE Multilin