Commissioning P54x/EN CM/La4
MiCOM P543, P544, P545 & P546
CM) 10-43
CM
8.4.2.4 Zone 3 reach check
The zone 3 element is set to be directional forward.
Apply a dynamic C-A fault, slightly in excess of the expected reach. The duration of the
injection should be in excess of the tZ3 timer setting (typically tZ3 + 100 ms). Repeat as in to
find the zone reach.
Record the impedance at which the relay tripped. The measured impedance should be
within +/- 10% of the expected reach. Read and reset the alarms.
Only a visual check that the correct reverse offset (Z3’) has been applied is needed. The
setting is found in cell [3143: Z3’ Ph Rev Reach] and [31A3: Z3’ Gnd Rev Reach].
8.4.2.5 Zone 4 reach check (if enabled)
The zo
ne 4 element is set to be directional reverse.
Apply a dynamic B-N fault, slightly in excess of the expected reach. The duration of the
injection should be in excess of the tZ4 timer setting (typically tZ4 + 100 ms). Repeat as in
8.4.2.2 to find the zone reach.
Re
cord the impedance at which the relay tripped. The measured impedance should be
within +/- 10% of the expected reach. Read and reset the alarms.
8.4.2.6 Zone P reach check (if enabled)
The zon
e P element can be set to be forward or reverse directional. The current injected
must be in the appropriate direction to match the setting in the DISTANCE SETUP menu
column (cells [3151] and [31B1]).
Apply a dynamic C-N fault, slightly in excess of the expected reach. The duration of the
injection should be in excess of the tZP timer setting (typically tZP + 100 ms). Repeat as in
8.4.2.2 to find the zone reach.
Re
cord the impedance at which the relay tripped. The measured impedance should be
within +/- 10% of the expected reach. Read and reset the alarms.
8.4.2.7 Resistive reach (quadrilateral characteristics only)
Only a visual
check that the correct settings for phase and ground element resistive reaches
have been applied is needed. The relevant settings are R1Ph, R2Ph, R3Ph, R3Ph reverse,
R4Ph and RP Ph for phase fault zones. The settings are R1Gnd, R2Gnd, R3Gnd, R3Gnd
reverse, R4Gnd and RP Gnd for ground fault zones.
Note: Zone 3 has an independent setting for the forward resistance reach
(right-hand resistive reach line), and the reverse resistance reach (left-
hand resistive reach line).
8.4.2.8 Load blinder
Only a
visual check that the correct settings for the load blinder have been applied is
needed. The settings are found at the end of the DISTANCE SETUP menu column, cells
[31D4] to [31D6]. It must be verified that [31D5: Load B/Angle] is set at least 10 degrees
less than the [3004: Line Angle] setting in the LINE PARAMETERS menu column.
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