S4 Elements
745
Transformer Management Relay
Se
tpoints
http://www.GEindustrial.com/multilin
5–81
GE Multilin
d) Loss of Life Limit
PATH: SETPOINTS
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S4 ELEMENTS
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INSULATION AGING
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LOSS OF LIFE LIMIT
The Loss of Life Limit element computes the total expended life of the transformer,
based on the aging factor and the actual in-service time of the transformer. For
example, if the aging factor is a steady 1.5 over a time period of 10 hours, the
transformer will have aged for an equivalent 1.5
×
10 = 15 hours. The cumulative
total number of hours expended is retained in the relay even when control power is
lost. The initial Loss of Life value, when a relay is first placed in service, can be
programmed under the transformer settings. The element operates on the
cumulative total value, with no time delay. The output of this element should be
used as an alarm only, as users may wish to leave the transformer in service beyond
the theoretical expended life.
Enter the expended life, in hours, required for operation of the element in the
LOSS
OF LIFE PICKUP
setpoint. This setting should be above the total life of the transformer,
in hours. As an example, for a 15-year transformer, the total number of hours would
be 13140
×
10 = 131400.
The actual values are only displayed if the Loss of Life option is installed
and the ambient temperature is enabled.
FIGURE 5–41: Loss-of-Life Scheme Logic
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LOSS OF LIFE
[
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]
LIMIT
LOSS OF LIFE LIMIT
FUNCTION: Disabled
Range: Enabled, Disabled
MESSAGE
LOSS OF LIFE LIMIT
TARGET: Self-Reset
Range: Self-Reset, Latched, None
MESSAGE
LOSS OF LIFE LIMIT
PICKUP: 16000 x 10h
Range: 0 to 20000 x 10h (a maximum
of 20000 hrs.) in steps of 1
MESSAGE
LOSS OF LIFE 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
NOTE
Summary of Contents for Multilin 745
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