Alstom MiCOM P54 Series, Technical Manual

Page: 107 / 1024

Settings P54x/EN ST/La4
MiCOM P543, P544, P545, P546
(ST) 4-29
ST
1.3.6 Power swing blocking (only in models with distance option)
The column
GROUP x POWER SWING Blk.
is used to set either blocking or indication for
o each
z
T ings
fr
Setting range
ut of step conditions. If blocking mode is selected, a user can individually select for
one to be either blocked or allow tripping.
he power swing detection is based on superimposed current, and is essentially “sett
ee”.
Menu text Default setting
Min. Max.
Step size
PSB Status Blocking Blocking or Indication
To enable (activate) Indication or Blocking mode. This setting is invisible if disabled in
‘CONFIGURATION’ column.
If Indication status is selected, the alarm will be issued but tripping by distance protection
will be unaffected. When Blocking status is selected, the user is presented with further
options as to which zones do/do not require blocking.
Zone 1 Ph. PSB Blocking Blocking, Delayed Unblocking, or Allow
trip
Setting that defines the Z1 phase element operation should any swing impedance enter
and remains inside the Z1 phase characteristic for more then ‘tZ1 Ph. Delay’.
If Blocking is selected, the Z1 phase element operation will be disabled for the duration of
the swing.
If Unblocking is chosen, the Z1 phase element block will be removed after drop off timer
‘PSB Unblocking Dly’ has expired, even if the swing is still present. This allows system
separation when swings fail to stabilize.
In ‘Allow trip’ mode, the Z1 phase element is unaffected by PSB detection.
Zone x Ph. PSB Blocking
Blocking, Delayed Unblocking, or Allow
trip
Individual Zone setting options all as per Zone 1 Ph. (x = 2, 3, 4, P).
Zone 1 Gnd. PSB Blocking
Blocking, Delayed Unblocking, or Allow
trip
Setting that defines the Z1 ground element operation should any swing impedance enter
and remains inside the Z1 ground characteristic for more then ‘tZ1 Gnd. Delay’.
If Blocking is selected, the Z1 ground element operation will be disabled for the duration of
the swing.
If Unblocking is chosen, the Z1 ground element block will be removed after drop off timer
‘PSB Unblocking Dly’ has expired, even if the swing is still present. This allows system
separation when swings fail to stabilize.
In ‘Allow trip’ mode, the Z1 ground element is unaffected by PSB detection.
Zone x Gnd. PSB Blocking
Blocking, Delayed Unblocking, or Allow
trip
Individual Zone setting options all as per Zone 1 Gnd. (x = 2, 3, 4, P).
PSB Unblocking Disabled Disabled or Enabled
To enable (activate) or disable (turn off) the PSB Unblocking delay timer.
This setting is common to all zones and it is visible if any distance zone is set to ‘PSB
Unblocking Dly’. For swing durations longer than this setting, blocking can be selectively
removed.
PSB Unblock dly 2 s 0.1 s 10 s 0.1 s
Unblock timer setting - on expiry, power swing blocking can optionally be removed.