Monitored Data - ABB Relion Technical Manual

1MRK 502 048-UUS A
Table 105: TRPTTR (49) Non group settings (basic)
Name Values (Range)
GlobalBaseSel 1 - 6
8.4.6
8.4.7
Technical manual
Unit Step
- 1

Monitored data

Table 106: TRPTTR (49) Monitored data
Name Type
TTRIP REAL
TTRIPCAL INTEGER
TRESCAL INTEGER
TRESLO REAL
HEATCONT REAL
I-MEASUR REAL
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
Thermal overload protection, two time constants (TRPTTR, 49).
From the largest of the three phase currents a relative final temperature (heat content) is
calculated according to the expression:
2
æ ö
I
Q = ç
÷
ç ÷
final
I
è ø
ref
EQUATION1171 V1 EN
where:
I
I
ref
Default Description
1 Selection of one of the Global Base Value
groups
Values (Range) Unit
- -
- -
- -
- -
- %
- %
is the largest phase current
is a given reference current
Section 8
Current protection
Description
Estimated time to trip (in min)
Calculated time status to trip:
not active/long time/active
Calculated time status to
reset: not active/long time/
active
Estimated time to reset of the
function (in min)
Percentage of the heat
content of the transformer
Current measured by the
function in % of the rated
current
(Equation 56)
237