Alstom MiCOM P546 - 1.21.2 Trip on reclose mode (Distance option only); 1.21.3 Polarization during circuit energization (Distance option only); 1.22 Directional function - setup of DEF and directional comparison elements (Distance option only)

Operation P54x/EN OP/La4
MiCOM P543, P544, P545 & P546 (OP) 5-53
OP
1.21.2 Trip on reclose mode (Distance option only)
The settings applied are as follows:
TOR Status
- With this feature Enabled, for a period following circuit breaker
closure, the relay operates in Trip on Reclose mode. Three
pole instantaneous tripping occurs for any fault detected by
the selected zones or/and ‘Current No Volt’ level detectors.
Whether this feature is enabled or disabled, the normal time
delayed elements or aided channel scheme continue to
unction and can operate to trip the circuit.
TOC Reset Delay
- The SOTF and TOR features remain in-service for the
duration of the TOC reset delay once the circuit is energized.
TOC Delay
- Is a user settable time delay that starts upon opening the CB
after which the ‘TOR’ becomes active (enabled). The time
delay must not exceed the minimum Dead Time setting as
both times start simultaneously and TOR protection must be
ready by the time of CB closing on potentially persistent faults.
TOR Tripping Links
- While the Trip on Reclose Mode is active, the MiCOM P54x
will trip instantaneously for pick up of or/and ‘Current No Volt’
level detectors any zone selected in these links. To operate
for faults on the entire circuit length it is recommended that at
least Zone 1 and Zone 2 are selected. If no elements are
selected then the normal time delayed elements and aided
scheme provide the protection.
1.21.3 Polarization during circuit energization (Distance option only)
While
the Switch on to Fault and Trip on Reclose modes are active, the directionalized
distance elements are partially cross polarized from other phases. The same proportion of
healthy phase to faulted phase voltage as given by the Distance Polarizing setting in the
DISTANCE SETUP menu is used.
Partial cross polarization is therefore used in substitute for the normal memory polarizing, for
the duration of the TOC window. If insufficient polarizing voltage is available, a slight reverse
offset (10% of the forward reach) is included in the zone 1 characteristic to enable fast
clearance of close up three phase faults. Therefore, the mapping of CNV function to the
SOTF tripping matrix is not essential.
1.22 Directional function - setup of DEF and directional comparison elements (Distance
option only
)
The MiCOM P54x with distance option installed has one additional aided channel (“pilot”)
scheme that can be used to supplement differential and distance protection.
 DEF - Directional earth (ground) fault protection;
 Delta - I and V based directional comparison scheme.
Both schemes are configured as unit protection, with a communication channel connected
between the remote line ends.
In order to make use of these schemes, base setting data must be made in the GROUP x
DISTANCE SETUP (for Delta comparison scheme) and GROUP x/ AIDED DEF (For
Directional earth fault protection)