GE 745 TRANSFORMER MANAGEMENT RELAY User Manual

5-74 745 Transformer Management Relay GE Power Management
5.6 S4 ELEMENTS 5 SETPOINTS
5
5.6.15 AGING FACTOR LIMIT
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
y AGING FACTOR LIMIT
y
[ENTER] for more
This message indicates the start of the
AGING FACTOR LIMIT
section. To
continue these setpoints press or press for the next section.
AGING FACTOR LIMIT
FUNCTION: Disabled
Range: Disabled / Enabled
AGING FACTOR LIMIT
TARGET: Self-Reset
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.
AGING FACTOR LIMIT
PICKUP: 2.0
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.
AGING FACTOR LIMIT
DELAY: 10 min.
Range: 0 to 60,000, steps of 1 minute
Enter a time delay above which the Aging Factor must remain before the
element operates.
AGING FACTOR LIMIT
BLOCK: Disabled
Range: Disabled / Logc Inpt 1 (2-16) /Virt Inpt 1 (2-16) / Output Rly 1 (2-8) /
SelfTest Rly / Virt Outpt 1 (2-5)
ENTER
MESSAGE

GE 745 TRANSFORMER MANAGEMENT RELAY Specifications

General

Brand	GE
Model	745 TRANSFORMER MANAGEMENT RELAY
Category	Relays
Language	English