Thermal Overload Protection, Two Time Constants Trpttr (49) - ABB Relion Technical Manual

Section 8
Current protection
8.4
8.4.1
8.4.2
234
Function
Relay open angle ROA
Operate time, non-directional
residual over current
Reset time, non-directional
residual over current
Operate time, non-directional
residual overvoltage
Reset time, non-directional
residual overvoltage
Operate time, directional
residual over current
Reset time, directional
residual over current
Critical impulse time non-
directional residual over
current
Impulse margin time non-
directional residual over
current
Thermal overload protection, two time constants
TRPTTR (49)
Identification
Function description
Thermal overload protection, two time
constants
Functionality
If a power transformer or generator reaches very high temperatures the equipment might
be damaged. The insulation within the transformer/generator will have forced ageing. As
a consequence of this the risk of internal phase-to-phase or phase-to-ground faults will
increase. High temperature will degrade the quality of the transformer/generator
insulation.
Range or value
(0-90) degrees
60 ms typically at 0 to 2 x I
set
65 ms typically at 2 to 0 x I
set
45 ms typically at 0.8 to 1.5 x U
85 ms typically at 1.2 to 0.8 x U
140 ms typically at 0.5 to 2 x I
85 ms typically at 2 to 0.5 x I
set
35 ms typically at 0 to 2 x I
set
25 ms typically
IEC 61850
identification
TRPTTR
1MRK 502 048-UUS A
Accuracy
± 2.0 degrees
60 ms typically at 0 to 2 x 1
65 ms typically at 2 to 0 x 1
45 ms typically at 0.8 to 1.5 x U
set
85 ms typically at 1.2 to 0.8 x U
set
-
set
-
-
-
IEC 60617 ANSI/IEEE C37.2
identification device number
49
SYMBOL-A V1 EN
Technical manual
set
set
set
set