ABB SPAD 330 C - Control Signals and Abbreviations; Intermodular Control Signals; Signal Abbreviation Glossary

7
Intermodular
control signals
Fig. 5. The control signals routed between the functional modules of the differential relay. The
second harmonic blocking signal BS OUT generated by any relay phase module also blocks the
other phase modules.
In connection and block diagrams the signal
abbreviations have been derived from the
Signal
abbreviations
English names of the signals, as follows:
Abbreviation English equivalent
I
1
I
2
I
d
Differential current
I
b
Bias (restraint) current
I
n
Rated current
I
2f
2nd harmonic or
I
hr
Harmonic restraint current
TS Trip signal
BS Blocking signal
IRF Internal relay fault
ENA Enable
Rx Receiver channel
Tx Transmitter channel
R Reset
S&R Step and Reset
STRÖMBERG
SPAD 330 C
I2f>
Id>
U1
SPCD3C21
I2f>
Id>
U2
SPCD3C22
I2f>
Id>
U3
SPCD3C23
TS
TS
TS
ENA
ENA
ENA
BS IN
BS OUT
BS IN
BS OUT
BS OUT
BS IN
1
A
U4
SPTR5B4