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Technical data
Differential relay module type designations
- differential relay module for phase L1
- differential relay module for phase L2
- differential relay module for phase L3
Biased differential stage I
Basic starting value p, setting range
Starting ratio s, setting range
HV side CT transforming ratio I
correction, setting range
LV side CT transforming ratio I
correction, setting range
Restraint threshold of the second
harmonic, setting range
Operation accuracy
Operating time
High-set stage I
Starting current I
Operation accuracy
Operation time
10
C
>
d
/I
1
n
/I
2
n
>>
d
>>, setting range
d
SPCD 3C21
SPCD 3C22
SPCD 3C23
20...50 % of I
n
10...50 %
0.5...1.0
0.5...1.0
10...20 % x I
d
±5 % of set value
20...50 ms
20...30 x I
n
±5 % of maximum value of setting range
10...20 ms
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