8.7.1
Identification
M14877-1 v2
Function description
IEC 61850
identification
IEC 60617
identification
ANSI/IEEE C37.2
device number
Thermal overload protection, two
time constants
TRPTTR
SYMBOL-A V1 EN-US
49
8.7.2
Functionality
M13243-3 v10
If a power transformer reaches very high temperatures the equipment might be damaged. The
insulation within the transformer will experience forced ageing. As a consequence of this the risk
of internal phase-to-phase or phase-to-ground faults will increase.
The thermal overload protection estimates the internal heat content of the transformer
(temperature) continuously. This estimation is made by using a thermal model of the transformer
with two time constants, which is based on current measurement.
Two warning pickup 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.
The estimated time to trip before operation is presented.
8.7.3
Function block
M13299-3 v5
ANSI06000272-2-en.vsd
TRPTTR (49)
I3P*
BLOCK
COOLING
MULTPU
RESET
TRIP
PICKUP
ALARM1
ALARM2
LOCKOUT
WARNING
ANSI06000272 V2 EN-US
Figure 272: TRPTTR (49) function block
8.7.4
Signals
PID-4148-INPUTSIGNALS v4
Table 250: TRPTTR (49) Input signals
Name
Type
Default
Description
I3P
GROUP
SIGNAL
-
Group signal for current input
BLOCK
BOOLEAN
0
Block of function
COOLING
BOOLEAN
0
Cooling input Disabled/ Enabled. Changes Ib setting and time
constant
MULTPU
BOOLEAN
0
Enable Multiplier for currentReference setting
RESET
BOOLEAN
0
Reset of function
Section 8
1MRK 502 066-UUS B
Current protection
518
Technical manual
Содержание Relion 670 series
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