GE Multilin 745 User Manual

S4 Elements745
Transformer Management Relay
Setpoints
http://www.GEindustrial.com/multilin
5–80
GE Multilin
c) Aging Factor Limit
PATH: SETPOINTS !" S4 ELEMENTS !" INSULATION AGING !" 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
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 operates.
FIGURE 5–40: Aging Factor Limit Scheme Logic
! AGING FACTOR [!]
LIMIT
AGING FACTOR LIMIT
FUNCTION: Disabled
Range: Enabled, Disabled
MESSAGE
AGING FACTOR LIMIT
TARGET: Self-Reset
Range: Self-Reset, Latched, None
MESSAGE
AGING FACTOR LIMIT
PICKUP: 2.0
Range: 1.1 to 10.0 in steps of 0.1
MESSAGE
AGING FACTOR LIMIT
DELAY: 10 min
Range: 0 to 60000 min. in steps of 1
MESSAGE
AGING FACTOR LIMIT
BLOCK: Disabled
Range: Logc Inpt 1 to 16, Virt Inpt 1 to
16, Output Rly 2 to 8, SelfTest
Rly, Vir Outpt 1 to 5, Disabled

GE Multilin 745 Specifications

General

Brand	GE
Model	Multilin 745
Category	Relays
Language	English