Signals - ABB RELION 620 Series Technical Manual

1MRS757644 F
4.1.7.6
620 series
Technical Manual
Table 332: Conversion table between one and two time constants
Short time constant (min) Long time constant (min) Weighting factor p
Single time constant
(min)
10 1.1
15 1.6
20 2.1
25 2.6
30 3.1
35 3.6
40 4.1
45 4.8
50 5.1
55 5.6
60 6.1
65 6.7
70 7.2
75 7.8
The default Max temperature setting is 105°C. This value is chosen since even though
the IEC 60076-7 standard recommends 98°C as the maximum allowable temperature
in long-time loading, the standard also states that a transformer can withstand the
emergency loading for weeks or even months, which may produce the winding
temperature of 140°C. Therefore, 105°C is a safe maximum temperature value for a
transformer if the Max temperature setting value is not given by the transformer
manufacturer.

Signals

Table 333: T2PTTR Input signals
Name Type
I_A SIGNAL
I_B SIGNAL
I_C SIGNAL
BLOCK BOOLEAN
AMB_TEMP FLOAT32
Table 334: T2PTTR Output signals
Name Type
OPERATE BOOLEAN
START BOOLEAN
ALARM BOOLEAN
BLK_CLOSE BOOLEAN
Protection functions
17
25
33
41
49
58
60
75
82
90
98
107
115
124
Default Description
0 Phase A current
0 Phase B current
0 Phase C current
0=False Block signal for activating the blocking mode
0 The ambient temperature used in the calculation
Description
Operate
Start
Thermal Alarm
Thermal overload indicator. To inhibite reclose.
Section 4
0.4
0.4
0.4
0.4
0.4
0.4
0.4
0.4
0.4
0.4
0.4
0.4
0.4
0.4
331