Appendix B -Settings and Signals
MENU TEXT COL ROW DEFAULT SETTING AVAILABLE OPTIONS
DESCRIPTION
[Courier Number (time-minutes)]
Setting for the second thermal time constant for the dual time constant characteristic.
GROUP 1: POWER
3D 00
This column contains settings for Power Swing Blocking/Out of Step Tripping
Power Swing 3D 01 Blocking
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 3D 03 Blocking
Blocking
Delayed Unblock
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 2 Ph. PSB 3D 05 Blocking
Blocking
Delayed Unblock
Setting that defines the Z2 phase element operation should any swing impedance enter and remains inside the Z2 phase characteristic for
more then ‘tZ2 Ph. Delay’.
If Blocking is selected, the Z2 phase element operation will be disabled for the duration of the swing.
If Unblocking is chosen, the Z2 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 Z2 phase element is unaffected by PSB detection.
Zone 3 Ph. PSB 3D 07 Blocking
Blocking
Delayed Unblock
Setting that defines the Z3 phase element operation should any swing impedance enter and remains inside the Z3 phase characteristic for
more then ‘tZ3 Ph. Delay’.
If Blocking is selected, the Z3 phase element operation will be disabled for the duration of the swing.
If Unblocking is chosen, the Z3 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 Z3 phase element is unaffected by PSB detection.
Zone P Ph. PSB 3D 09 Blocking
Blocking
Delayed Unblock
Setting that defines the ZP phase element operation should any swing impedance enter and remains inside the ZP phase characteristic for
more then ‘tZP Ph. Delay’.
If Blocking is selected, the ZP phase element operation will be disabled for the duration of the swing.
If Unblocking is chosen, the ZP 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 ZP phase element is unaffected by PSB detection.
Zone 4 Ph. PSB 3D 0B Blocking
Blocking
Delayed Unblock
Setting that defines the Z4 phase element operation should any swing impedance enter and remains inside the Z4 phase characteristic for
more then ‘tZ4 Ph. Delay’.
If Blocking is selected, the Z4 phase element operation will be disabled for the duration of the swing.
If Unblocking is chosen, the Z4 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 Z4 phase element is unaffected by PSB detection.
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