Function Block; Signals - ABB RET650 Technical Manual

1MRK 504 135-UEN A
8.5.3
8.5.4
Technical manual
The thermal overload protection estimates the internal heat content of the transformer/
generator (temperature) continuously. This estimation is made by using a thermal
model of the transformer/generator with two time constants, which is based on current
measurement.
Two warning levels are available. This enables actions in the power system to be done
before dangerous temperatures are reached. If the temperature continues to increase to
the trip value, the protection initiates a trip of the protected transformer/generator.
Estimated time to trip before operation is presented.

Function block

TRPTTR
I3P* TRIP
BLOCK START
COOLING ALARM1
RESET ALARM2
LOCKOUT
WARNING
IEC08000037 V1 EN
Figure 76: TRPTTR function block

Signals

TRPTTR is not provided with external temperature sensor in first
release of 650 series. The only input that influences the temperature
measurement is the binary input COOLING.
Table 91: TRPTTR Input signals
Name Type
I3P GROUP
SIGNAL
BLOCK BOOLEAN
COOLING BOOLEAN
RESET BOOLEAN
Table 92: TRPTTR Output signals
Name Type
TRIP BOOLEAN
START BOOLEAN
ALARM1 BOOLEAN
ALARM2 BOOLEAN
LOCKOUT BOOLEAN
WARNING BOOLEAN
Default Description
- Three phase group signal for current input
0 Block of function
0 Cooling input changes IBase setting and time
constant
0 Reset of function
Description
Trip Signal
Start signal
First level alarm signal
Second level alarm signal
Lockout signal
Trip within set warning time
Section 8
Current protection
173