Appendix B -Settings and Signals
MENU TEXT COL ROW DEFAULT SETTING AVAILABLE OPTIONS
DESCRIPTION
Setting determines which auto-reclose modes are permitted for leader /follower circuit breakers.
The auto-reclose scheme provides single phase or three phase auto-reclosing of a feeder switched by two circuit breakers. The two circuit
breakers are normally arranged to reclose sequentially with one, designated the ‘Leader’ circuit breaker, reclosing after a set dead time
followed, if the leader CB remains closed, by the second circuit breaker, designated the ‘Follower’ circuit breaker after a further delay
(follower time).
L1P F1P : both leader and follower are configured for single phase auto-reclosing.
L1P F3P : the leader is configured for single phase auto-reclosing, whilst the follower is configured for three phase auto-reclosing.
L3P F3P : both leader and follower are configured for three phase auto-reclosing.
L1/3P F1/3P : both leader and follower are configured for either single phase or three phase auto-reclosing.
L1/3P F3P : the leader is configured for single phase or three phase auto-reclosing, while the follower is configured for three phase auto-
reclosing only.
AR Opto : the auto-reclosing mode of the leader and follower are controlled by opto input signals (Opto) mapped via DDBs (1497) Lead AR 1P,
(1498) Lead AR 3P, (1409) Follower AR 1P, and (1410) Follower AR 3P.
Leader Select By 49 55 Menu
Opto
Control
Setting which determines how the preferred leader CB is selected - can be by menu setting, HMI command or by designated opto input.
If Leader Select By: is set to Leader by Opto, then preferred leader CB is :-
• CB1 if input DDB(1408) CB2 Lead is low, or
• CB2 if input DDB (1408) CB2 Lead is high.
If Leader Select By: is set to Leader by Control, then user control setting CTRL CB2 Lead under CB CONTROL in the IED menu determines the
preferred leader by applying set/reset commands (If Set then CB2 is leader ,If Reset then CB1 is leader).
Select Leader 49 56 CB1
CB2
If Leader Select By is set to Leader by Menu in the previous cell, then setting Select Leader becomes visible, and determines which CB is the
preferred leader.
BF if LFail Cls 49 57 Enabled
Enabled
BF if L Fail Cls = Block Follower reclose if Leader CB Fails to close. This setting determines whether a follower CB should lock out without
reclosing, or continue to reclose, if the leader CB fails to reclose when the leader CB close command is given.
If BF if L Fail Cls is set to Enable, follower CB reclosing is locked out if the leader fails to close.
If BF if L Fail Cls is set to Disable, the follower CB can continue its reclose cycle if the leader CB fails to close. (See also setting Dynamic F/L).
Dynamic F/L 49 58 Disabled
Enabled
Dynamic F/L = Dynamic change from follower to leader status during an auto-reclose cycle if the leader CB fails to close.
If setting BF if Lfail Cls is set to Disabled, then setting Dynamic F/L becomes visible and determines whether the follower CB should assume
leader status and reclose immediately if the leader CB should fail to close, or whether it should continue as follower and reclose after the
Follower Time delay.
Dynamic F/L set to Enabled selects immediate follower reclose if the leader CB fails to close;
Dynamic F/L set to Disabled selects the follower to reclose after the Follower Time if leader CB fails to close.
AR Shots 49 59 1
From 1 to 4 in steps of 1
[Unsigned Integer (16 bits)]
This setting determines how many reclose attempts (shots) are permitted for any single fault incident before it is treated as persistent and
auto-reclosing is locked out. For example if AR Shots = 2, a second reclose attempt is initiated if the protection retrips during the reclaim
time following one reclose attempt, but locks out if the protection retrips during the reclaim time after a second reclose attempt.
Multi Phase AR 49 5C Allow AR
BAR 2 and 3Ph
BAR 3 Phase
This setting determines whether auto-reclosing is permitted or blocked for two phase or three phase faults.
Discrim Time 49 5D 0.1
From 0.005 to 5 in steps of 0.005
[Courier Number (time-seconds)]
Discrim Time = Discriminating Time. This is a setting which determines whether a fault on another phase (evolving or developing fault) after
single phase trip and
auto-reclose has been initiated by a single phase fault stops the single phase cycle and starts a three phase auto-reclose cycle provided this
second fault (evolving fault) occurs BEFORE the Discrimination Time elapsed. It forces a lockout if second fault (evolving fault) occurs AFTER
Discrimination Time has elapsed but before Single Phase Dead Time elapses.
To Next Page
Loading...
