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ABB Network Control
& Protection
Features
Biased single phase differential relay
module
Definition of the power transformer
vector group by means of selector
switches on the relay front plate
Adjustable basic setting and starting
ratio
Additional adjustable instantaneous
high-set stage
Differential relay module
SPCD 3C21, SPCD 3C22, SPCD 3C23
Separately adjustable corrections of
the transforming ratios of the high-
voltage and low-voltage side current
transformers
Automatic blocking of relay operation
based on the appearance of the second
harmonic component of the differential
current
34 SPCD 1 EN1 D
1993 - 09 - 07
Written
Checked
Approved
D
1
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