30
1MRS 750616-MUM
Directional or Non-Directional Earth-Fault Relay
Technical Reference Manual
REJ 527
1)
At IDMT characteristic, the REJ 527 allows settings above 40% x I
n
for stage I
0
, but regards any
setting >40% x I
n
as equal to 40% x I
n
.
2)
The stage can be set out of operation in SGF. This state will be indicated by dashes on the LCD and
by "999" when parameters are read via the SPA bus.
Switchgroups and parameter masks
The settings can be altered and the operation characteristics of the relay in various
applications selected in the SG_ selector switchgroups. The switchgroups are
software based and thus not physical switches to be found in the hardware of the
relay. The switches can be set one by one.
A checksum is used for verifying that the switches have been properly set. The
figure below shows an example of manual checksum calculation.
)LJ $QH[DPSOHRIFDOFXODWLQJWKHFKHFNVXPRID6*BVHOHFWRU
VZLWFKJURXS
When the checksum, calculated according to the example above, equals the
checksum of the relay, the switches in the switchgroup have been properly set.
The factory default settings of the switches and the corresponding checksums are
presented in the tables below.
t
0
>>
Operate time of stage I
0
>> or U
0
>> in
seconds at definite-time characteristic
0.10...300 s
0.10 s
ϕ
a
Additional angle of stages I
0
> and I
0
>>
with the basic angle characteristic
0...90
°
0
°
ϕ
b
Basic angle of stages I
0
> and I
0
>>.
-90
...
0
°
-90
°
ϕ
c
Angle correction of stages I
0
> and I
0
>>
with the I
ϕ
characteristic
2...7
°
2
°
CBFP
Circuit-breaker failure protection
0.10...1.00 s
0.10 s
Switch
No
Position
Weighting
factor
Value
1
1
x
1
=
1
2
0
x
2
=
0
3
1
x
4
=
4
4
0
x
8
=
0
5
1
x
16
=
16
6
0
x
32
=
0
7
1
x
64
=
64
8
0
x
128
=
0
Checksum
SG_
∑
=
85
Table 4.1.4.6-1
Setting values
Setting
Description
Setting range
Default setting
Summary of Contents for REJ 527
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