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5.6 S4 ELEMENTS
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 inter-
rupted . The necessary settings required for this element to perform correctly are entered under:
SETPOINTS/S4 ELEMENTS/INSULATION AGING/AGING FACTOR LIMIT
S AGING FACTOR LIMIT
S [ENTER] for more
AGING FACTOR LIMIT
FUNCTION: Disabled
AGING FACTOR LIMIT
TARGET: Self-Reset
AGING FACTOR LIMIT
PICKUP: 2.0
5
AGING FACTOR LIMIT
DELAY: 10 min.
AGING FACTOR LIMIT
BLOCK: Disabled
5-74
This message indicates the start of the AGING FACTOR LIMIT section. To
continue these setpoints press
Range: Disabled / Enabled
Range: Self-reset / Latched / None
Select None to inhibit the display of the target message when the element
operates. Thus an element whose "target type" is None never disables the
LED self-test feature since it cannot generate a displayable target message.
Range: 1.1 to 10 (steps of 0.1)
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.
Range: 0 to 60,000, steps of 1 minute
Enter a time delay above which the Aging Factor must remain before the
element operates.
Range: Disabled / Logc Inpt 1 (2-16) /Virt Inpt 1 (2-16) / Output Rly 1 (2-8) /
SelfTest Rly / Virt Outpt 1 (2-5)
745 Transformer Management Relay
5.6.15 AGING FACTOR LIMIT
or press
for the next section.
EN TE R
M E SS AG E
GE Power Management
5 SETPOINTS
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