Dead Time Control; Figure 143: Blocking Instantaneous Protection For Lockouts - GE MiCOM P40 Agile Technical Manual

P14D
Instantaneous protection can also be blocked when the IED is locked out, using the AR Lockout setting. It can also
be blocked after a manual close using the Manual Close setting. When the IED is in the Non-auto mode it can be
blocked by using the AR Deselected setting. The logic for these features is shown below.
Autoreclose disabled
Lockout Alarm
Pre-Lockout
EFF Maint Lock
Block Inst Prot
No Block
Block Main Prot Trips
Main Protection Start
Live Line Mode (int)
Block SEF Prot Trips
SEF Protection Start
Live Line Mode (int)
Lockout Alarm
AR Lockout
Block Inst Prot
No Block
Non Auto Mode
AR Deselected
Block Inst Prot
No Block
AR In Progress
CB Closed 3 ph
Auto Mode (int)
Autoreclose inhibit
Manual Close
Block Inst Prot
No Block
V00507

Figure 143: Blocking instantaneous protection for lockouts

7.5

DEAD TIME CONTROL

When the setting CS AR Immediate is enabled, immediate re-closure of the circuit breaker is allowed providing
that both sides of the circuit breaker are live and in synchronism at any time after the dead time has started. This
allows for quicker load restoration, as it is not necessary to wait for the full dead time to expire.
If CS AR Immediate is disabled, or neither Line nor Bus are live, the dead timer will continue to run, if the Dead
Time Enabled signal is high. The Dead Time Enabled function could be mapped to an opto-input to indicate that
the circuit breaker is healthy. Mapping the Dead Time Enabled function in PSL increases the flexibility by allowing it
to be triggered by other conditions such as Live Line/Dead Bus. If Dead Time Enabled is not mapped in PSL, it
defaults to high, so the dead time can run.
The dead time control logic is shown below.
P14D-TM-EN-8
&
& & &
S
Q
1
R
& & &
S
Q
1
R
&
1
&
&
1
&
20ms
Chapter 13 - Autoreclose
1 &
AR Blk Main Prot
1 &
AR Blk SEF Prot
269