ABB Distribution Protection Unit 1500R
1-24
Protective Functions
9/99
website:www.abb.com/papd
A red “Recloser Out” target contained on the front panel of the DPU1500R indicates that the recloser function is
disabled. The logical input, 43A is used to remotely enable or disable the recloser (I.E. via control switch). If this logical
input is not mapped to a physical input (see Programmable I/O Section), the recloser is defaulted to enabled. If the
recloser is in the middle of a sequence and the 43A logical input is made inactive the recloser will stop operation. When
43A is returned to the active state, the recloser will be reset to step 79-1. The recloser function can also be disabled
by setting 79-1 to lockout.
See Table 5-1 for the 79 factory default settings.
Lockout
The DPU1500R will lockout reclosing if any one of the following conditions are true:
•
A fault persists for the entire reclose sequence.
•
The breaker is manually closed and a fault occurs before the reset time expires.
•
A Trip output occurs and the fault current is not removed and/or the 52a/52b contacts did not change state
before expiration of the Trip Fail Timer (5 to 60 cycles).
•
A Close output occurs and the 52a/52b contacts do not change state before the expiration of the Close Fail
Timer. If the Circuit Breaker subsequenty closes and trips within the reset time, the recloser will lock out.
•
The reclose function is set to lockout after a 50P-1, 50P-2, 50P-3, 51N, 50N-1, 50N-2, or 50N-3 overcurrent trip.
•
The voltage block function, 79V, is enabled, the bus voltage is below the 79V setting, and the 79V time delay
has expired.
A lockout condition is displayed on the LCD display as “Recloser Lockout”. A logical output, 79LOA is also asserted
for a lockout condition. The lockout state is cleared when the DPU1500R senses a manual breaker close by the state
of the 52a and 52b contacts and the reset timer expires.
79-1
50P-1
Enable
Disable
Lockout
50P-2
Enable
Disable
Lockout
50P-3
Enable
Disable
Lockout
51N
Enable
Disable
Lockout
50N-1
Enable
Disable
Lockout
50N-2
Enable
Disable
Lockout
50N-3
Enable
Disable
Lockout
Same selections are available for the 79-2, 79-3, and 79-4 recloser functions
.
Figure 1-14. Recloser Sequence