Parameter: 79 PF > HS Trips to LO Target
•
Default setting: 5
Sets the number of allowed HighSet trips. The relay will go to Lockout on the last HighSet trip. This
function can be used to limit the duration and number of high current trips that the circuit‑breaker is
required to perform. If the fault is permanent and close to the circuit‑breaker then there is no point in
forcing a number of delayed Trips before the relay goes to Lockout, that sequence will be truncated.
Parameter: 79 PF > Delayed Trips to LO Target
•
Default setting: 5
Sets the number of allowed delayed trips, the relay will go to Lockout on the last delayed trip. This func-
tion limits the number of delayed trips that the relay can perform when the instantaneous protection
elements are externally inhibited for system operating reasons, sequences are truncated.
Parameter: 79 PF > PF SOTF Trip
•
Default setting: Inst
Settings Example
•
Out of Service
Autoreclose is switched out and will not start if a trip occurs. This state will remain until autoreclose is
switched in.
•
In Service
Autoreclose is in service and is in an idle state and ready for a trip to occur.
•
Sequence in progress
An autoreclose sequence will start if the circuit‑breaker was closed, a trip has occurred and the protection
element is configured as an autoreclose trigger. Additionally, the line voltage must be live and the line or
bus voltage must go dead if Live Line Check is Enabled in devices with Check Synchronizing.
The autoreclose shot number will be incremented from 0 to 1. The autoreclose will remain in the
Sequence in Progress state until the circuit‑breaker is open and the protection pickup has reset. It
will then progress to the Deadtime state. If this does not occur within the 79 Sequence Fail Timer
the autoreclose will go to the Lockout state. This prevents autoreclose being primed indefinitely. 79
Sequence Fail Timer can be switched to 0 (= Off).
•
Deadtime
The autoreclose will remain in this state for the appropriate deadtime setting time. The setting applied
depends on the fault type defined by the autoreclose trigger mapping for the protection element that
tripped and the current autoreclose shot number. The deadtime will not start until either the bus or line
goes dead if Live Line Check is Enabled. If a further protection trip occurs during the deadtime the
autoreclose will increment the shot number then return to Sequence in Progress, wait for the trip
to reset before starting the next deadtime. When the deadtime time setting expires, the autoreclose
progresses to Close Inhibit. In devices with Check Synchronizing, if Check Sync during
Deadtime is Enabled and the line becomes live during the deadtime and check synchronizing settings
are met before the deadtime expires, the autoreclose truncates the deadtime and progresses to Close
Inhibit.
Control Functions
7.3 79 Automatic Reclosing
Reyrolle 7SR5, Overcurrent Protection Device, Device Manual 429
C53000-G7040-C014-1, Edition 11.2019
To Next Page
Loading...
