Name Values (Range) Unit Step Default Description
Alarm1 50.0 - 99.0 %Itr 1.0 80.0 First alarm level in % of heat content trip
value
Alarm2 50.0 - 99.0 %Itr 1.0 90.0 Second alarm level in % of heat content
trip value
LockoutReset 10.0 - 95.0 %Itr 1.0 60.0 Lockout reset level in % of heat content
trip value
ThetaInit 0.0 - 95.0 % 1.0 50.0 Initial Heat content, in % of heat content
trip value
Warning 1.0 - 500.0 Min 0.1 30.0 Time setting, below which warning would
be set (in min)
tPulse 0.01 - 0.30 s 0.01 0.10 Length of the pulse for trip signal (in sec).
Table 253: TRPTTR (49) Non group settings (basic)
Name Values (Range) Unit Step Default Description
GlobalBaseSel 1 - 12 - 1 1 Selection of one of the Global Base Value
groups
8.7.6 Monitored data
PID-4148-MONITOREDDATA v3
Table 254: TRPTTR (49) Monitored data
Name Type Values (Range) Unit Description
HEATCONT REAL - % Percentage of the heat content of the
transformer
I-MEASUR REAL - % Current measured by the function in % of
the rated current
TTRIP INTEGER - - Estimated time to trip (in min)
TRESLO INTEGER - - Estimated time to reset of the function (in
min)
TTRIPCAL INTEGER 0=Not Active
1=Long Time
2=Active
- Calculated time status to trip: not active/
long time/active
TRESCAL INTEGER 0=Not Active
1=Long Time
2=Active
- Calculated time status to reset: not active/
long time/active
8.7.7 Operation principle
M13249-3 v8
The sampled analog phase currents are pre-processed and for each phase current the true RMS
value of each phase current is derived. These phase current values are fed to the protection
function.
From the largest of the three phase currents a relative final temperature (heat content) is
calculated according to the expression:
Section 8 1MRK 502 066-UUS B
Current protection
520
Technical manual
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