Technical Data - ABB REL 501-C1 2.5 Technical Reference Manual

3.7
Time delayed residual overcurrent protection
(TEF)

Technical data

Table 122: TEF - Time delayed non-directional residual overcurrent protection
Parameter
Start current, definite time or inverse
time delay, IN>
Operate value for Forward I
directional current degrees
measurement
Reverse
Characteristic angles
Definite time delay
Time multiplier for inverse time delay
k
Normal inverse characteristic
I = I /I
meas set
Very inverse characteristic
Extremely inverse characteristic
Logarithmic characteristic
Min. operate current for dependent
characteristic, IMin
Minimum operate time for dependent
characteristic, tMin
Minimum polarising voltage
Reset time
Setting range
5-300% of Ib in steps of
1%
at ϕ =65
5-35% of Ib in steps
N
of 1%
60% of the setting for for-
ward operation
65 degrees lagging
0.000 - 60.000 s in steps
of 1ms
0.05-1.10 in steps of 0.01 According to IEC 60255-3
13.5
---------- - k ⋅
t =
I 1
–
t = 5.8 1.35 –
100-400% of IN in steps
of 1%
0.000-60.000 s in steps
of 1 ms
1 % of U
r
<70 ms
Accuracy
± 5% of set value
± 1.5% of I
r
± 1.5% of I
r
± 5 degrees at 20 V and I
of I
r
± 0.5 % +/-10 ms
IEC 60255-3 class 5 ± 60 ms
IEC 60255-3 class 7.5 ± 60 ms
IEC 60255-3 class 7.5 ± 60 ms
± 5 % of t at I = (1.3-29) × I
I
⋅
---- -
ln
I
N
± 5% of I
set
± 0.5 % ± 10 ms
± 5%
At 50 Hz: 1% of U
r
At 60 Hz: 1% of U -15% to -5%
r
-
Chapter 5
Current
=35%
set
N
115