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Table 276:
Conversion table between one and two time constants
Single time constant (min)
Short time constant (min) Long time constant (min) Weighting factor p
10
1.1
17
0.4
15
1.6
25
0.4
20
2.1
33
0.4
25
2.6
41
0.4
30
3.1
49
0.4
35
3.6
58
0.4
40
4.1
60
0.4
45
4.8
75
0.4
50
5.1
82
0.4
55
5.6
90
0.4
60
6.1
98
0.4
65
6.7
107
0.4
70
7.2
115
0.4
75
7.8
124
0.4
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.
4.1.5.6
Signals
Table 277:
49T Input signals
Name
Type
Default
Description
I_A
SIGNAL
0
Phase A current
I_B
SIGNAL
0
Phase B current
I_C
SIGNAL
0
Phase C current
BLOCK
BOOLEAN
0=False
Block signal for activating the blocking mode
AMB_TEMP
FLOAT32
0
The ambient temperature used in the calculation
Section 4
1MAC059074-MB A
Protection functions
282
615 series ANSI
Technical Manual
Содержание Relion 615 series
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