Sel 2414 - Page 95

5.27
Date Code 20130214 Instruction Manual SEL-2414 Transformer Monitor
Metering and Monitoring
Monitoring
Figure 5.19 Insulation Aging Acceleration Factor Alarm Logic
Daily Rate of Loss-of-Life Limit (RLOLL)
Range: 0–99%, in 0.01% steps
One of the outputs the thermal element provides is daily rate of loss of life. This
output is a measure (in percent) of the life lost from the relay during a 24-hour
period. RLOLL determines a limit for daily rate of loss-of-life. If the daily rate of
loss-of-life exceeds the limit, a RLL Device Word bit asserts. Using SEL
OGIC
control equations, you can configure the RLL Device Word bit to close an alarm
contact. Once asserted, the RLL Device Word bit will stay asserted until the rate
of loss of life drops below 99 percent of the RLOLL setting. Since rate-of-loss of
life is calculated once per day, this alarm will stay asserted for at least one full
day.
When ETHERM = 3 or ETHERM = W, daily rate of loss-of-life is calculated for
each of the three individual windings. The RLL Device Word bit asserts when
any of the three values exceeds the limit. The thermal report will show which
transformer/winding exceeded the limit.
T1FAA or W1FAA
FAA1_1, W1_FAA1
FAA2_1, W2_FAA1
FAA3_1, W3_FAA1
Winding 1
FAA Logic
FAAL1
(Setting)
T2FAA or W2FAA
T3FAA or W3FAA
FAAL2
(Setting)
FAAL1
(Setting)
FAAL2
(Setting)
FAAL1
(Setting)
FAAL2
(Setting)
ENABLED IF ETHERM = 3 OR W
FAA1
Winding 2
FAA Logic
FAA1_2, W1_FAA2
FAA2
FAA2_2, W2_FAA2
FAA3_1, W3_FAA1
Winding 3
FAA Logic