FOXBORO P0926GH system PLC/DCS module card module

FOXBORO P0926GH system PLC/DCS module card module

Technical data of product parameters

Directional operation can, however, be achieved by linking the P0926GH
directional signal ( ‘MeasFwd’, i.e. fault in forwards direction)
from the E/F protection to the blocking I/P of the IDMT function.
The I/P must be inverted so that blocking of the IDMT function is
cancelled by an active forwards signal. When using this arrangement, it must be noted that, when ‘MeasFwd’ does not pick P0926GH
up, the IDMT function cannot trip when the reference voltage of
the E/F function is too low. If tripping is required for this case, the
directional E/F signal ‘MeasBwd’ must be applied to the blocking
input.In schemes involving single-phase reclosure, the ‘I0-Invers’
function has to be blocked for the time that one pole of a circuitbreakers is open if the minimum tripping time ‘tmin’ is set less
than the single-phase dead time. This avoids false three-phase
tripping due to the load currents in the healthy phases.The HV distance protection is optimised for applications in EHV
power systems. The main difference compared with the standard
distance protection function is improved phase selection to
achieve a better response to evolving faults on parallel circuits.
Refer to the standard distance relay function in Section 3.5.31.
for the setting procedure. However, note must be taken of the
following differences (the parameters in Section 3.5.31. that do
not apply to the HV distance protection or have a different
significance are marked): P0926GH
In addition to the non-directional starter mode available up to
the present, the “PhaseSelMode” parameter also permits the
direction and reach of the overreach zone to be selected.
This is only effective, however, for phase selection in the first
time step and has no influence on (non-directional) signals.
The “PhaseSelMode” parameter can be set to one of the followingDistance protection for the high-speed discriminative protection
of long or short overhead lines or cables, double-circuit lines,
heavily loaded lines, lines with weak infeeds and what are referred to as “short-zone” lines.
The protection is applicable to solidly or low-resistance grounded
systems, systems with Petersen coils or to ungrounded systems.
All kinds of faults are detected including close-in three-phase
faults, cross-country faults, evolving faults and high-resistance
earth faults

Product picture display

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