FOXBORO thermistor input/output module P0924JH card

FOXBORO thermistor input/output module P0924JH card

Technical data of product parameters

The protection function includes a P0924JH “transient blocking logic” to
prevent any mal-operation during the course of tripping a fault or
auto-reclosure on double-circuit lines, when there is a likelihood
of the flow of energy reversing direction. The time setting can be
selected in a wide range to suit the prevailing conditions.
For example, after a fault has been detected in the backwards
direction, a second directional decision in the forwards direction
is inhibited for the setting of ‘t TransBlk’ .
The time chosen is determined largely by the time required for P0924JH
the measurement to reset and the transfer tripping scheme in
use.The ‘Recve Inh’ signal prevents the distance function from
receiving a PLC signal (see Section 3.5.28.1.). It is only
generated when the parameter ‘1 Channel’ is set, the basic time
has expired or the E/F protection picks up for a reverse fault.
The signal ‘Recve Inh’ must be connected to the distance
function I/P ‘ExtBlkHF’The recommended setting is 60 ms plus the reset time of the P0924JH
communication channeWhere the zero-sequence components of the voltages and the
currents are derived internally, the analogue inputs must be connected precisely as shown in the wiring diagram. The neutral of
the c.t’s in this case is formed on the line side and the parameter
‘CT neutral’ must be set to ‘line side’ The ‘CB position’ I/P is intended for the position indicator signal
from the circuit-breaker and has a fixed pick-up delay of 50 ms.
The protection function is only enabled when this signal is
received to confirm that the CB is closed. The corresponding
auxiliary contacts for the three phases must be connected in
series to ensure that the protection does not operate during
single-phase reclosure.The echo logic is enabled 100 ms after the circuit-breaker is
opened

Product picture display

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