Compact current relay and
protection assemblies
RXHL 401 and
RAHL 401
1MRK 509 062-BEN
Page 15
Table 14: Time functions for overcurrent protection
Table 15: Earth-fault protection
Time function
Stage I>
Stage I>>
Stage I>>>
Time delay
Inverse or definite
time (NI, VI, EI, LI
and RI)
Definite
time
Definite
time
Setting range, definite time
0-20 s
Accuracy, definite time
+/−
30 ms
Setting range, inverse time
k = 0.05-1.1
-
-
Min time, inverse time
0-2.0 s
-
-
Accuracy,
inverse time
a)
NI, VI,
EI, LI
b)
2.0 x I>
set
12.5% and +/-30 ms
-
-
5.0 x I>
set
7.5% and +/-30 ms
10.0 x I>
set
5% and +/-30 ms
20.0 x I>
set
5% and +/-30 ms
RI
1.0 - 1.3 x I>
set
12.5% and +/-30 ms
-
-
1.3 - 20.0 x I>
set
5% and +/-30 ms
Linear reset time
0-500 s
-
-
a)
A percentage value of theoretical time and a definite time delay
b)
According to IEC 60225-3, signed error 5.
Earth-fault protection
Stage I
N
>
Stage I
N
>>
Stage I
N
>>>
Setting range
(0.1-2.5) x IN
r
(1.0-20) x I
N
>
1.0-20) x I
N
>
Limiting errors of set operate value for current
measuring 50/60 Hz
< 3%
< 3%
< 3%
Consistency of set operate value 50/60 Hz
< 1%
< 1%
< 1%
Typical reset ratio
95%
Typical operate time I = 0 => 3 x set operate
value
40 ms
Typical reset time I = 3 => 0 x set operate value 45 ms
Transient over-reach L/R = 50, 100, 200 and
500 ms
< 5%
Typical overshoot time
30 ms
Recovery time at I = 3 x set operate value
< 55 ms
Frequency depen-
dency
F
r
= 50 Hz (45-55 Hz)
< 5%
F
r
= 60 Hz (54-66 Hz)
< 5%
150/180 Hz
Typical 1.5/2.0 x set operate value
250/300 Hz
Typical 3.0/4.0 x set operate value
