The new broad range mode is capable of detecting an earth fault directionally in both unearthed and
compensated networks not only by combining the two stages together but by using a new multi-criteria
detection. This optional additional tripping condition for compensated networks uses Arcteq’s
patented, high-resolution intermittent earth fault algorithm with added symmetrical component
calculation of phase currents and voltages. If this mode is activated, the alarming criteria is comprised
of a measured residual current in the fourth quadrant and the symmetrical components of voltages and
currents detecting a fault. No extra parameterization is required compared to the traditional method.
The multi-criteria algorithm can be tested with COMTRADE les supplied by Arcteq. The function
requires a connection of three-phase currents, residual current and residual voltage to operate
correctly.
To avoid unnecessary alarms the user can add an encroachment area against I0 CT errors in
compensated long healthy lines.
Figure. 5.3.4. - 55. Effect of angle divider when in use and when disabled.
To receive a more accurate indication as to whether the fault was in a compensated or an unearthed
network the angle divider can divide the area which would otherwise be overlapped between the two
network models. By default the setting is 45 degrees. When the divider is disabled the angle is set to
zero degrees.
Events and registers
The directional earth fault function (abbreviated "EMON" in event block names) generates events and
registers from the status changes in ALARM events. The user can select the status ON or OFF for
messages in the main event buffer.
The triggering event of the function is recorded with a time stamp and with process data values.
Table. 5.3.4. - 58. Event codes.
Event number
Event channel
Event block name
Event code
Description
8646
135
EMON1
6
I0dir> (67N) Detect ON
8647
135
EMON1
7
I0dir> (67N) Detect OFF
The function registers its operation into the last twelve (12) time-stamped registers. The register of the
function records the ALARM event process data. The table below presents the structure of the
function's register content.
AQ-E215
Instruction manual
Version: 2.01
© Arcteq Relays Ltd
78
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