ABB RELION 670 Series Technical Manual page 526

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