Instruction manual –AQ F210 Feeder Protection IED
250 (292
)
allows DC ripple of <15 % and start-up time of power supply is < 5 ms. Further details refer
to the “Technical data” section of this document.
Binary inputs are scanned in 5 millisecond cycle. This makes the state of input to be updated
between 0…5 milliseconds. When input is used internally in IED (group change or logic) it
takes additional 0…5 milliseconds to operate. So in theory when binary input is used for
group control or similar it takes 0…10 milliseconds to change the group. In practice the
delay is between 2…8 milliseconds about 95% of the time. In case the binary input is
connected directly to binary output (T1…Tx) it takes additional third 5 millisecond round.
When binary input is controlling internally binary output it takes 0…15 milliseconds in theory
and 2…13 milliseconds in practice. This delay excludes the mechanical delay of the relay.
7.2
C
URRENT MEASUREMENT MODULE
AQ-2xx basic five channel current measure module includes three phase current
measurement inputs and also coarse and fine residual current inputs.
Connector Description
CTM 1-2
Phase current measurement for phase L1 (A)
CTM 3-4
Phase current measurement for phase L2 (B)
CTM 5-6
Phase current measurement for phase L3 (C)
CTM 7-8
Coarse residual current measurement I01
CTM 9-10 Fine residual current measurement I02
Figure 7.2-4 current measurement module
Current measurement module is connected to secondary side of conventional current
transformers (CTs). Nominal dimensioning current for the phase current inputs is 5 A. Input
nominal current can be scaled for secondary currents of 1…10 A. Secondary currents are
calibrated to nominal currents of 1A and 5A which provide ± 0.2% inaccuracy in range of
0,05 x In – In – 4 x In.