To Next Page

To Previous Page

7SR11 & 7SR12 Description Of Operation

4.1.5 P/F SHOTS SUB-MENU

This menu allows the Phase fault trip/reclose sequence to be parameterized:-

79 P/F Prot’n Trip1 The first protection Trip in the P/F sequence can be set to either Inst or Delayed.

79 P/F Deadtime 1 Sets the first Reclose Delay (Dead time) in the P/F sequence.

79 P/F Prot’n Trip2 The second protection Trip in the P/F sequence can be set to either Inst or Delayed.

79 P/F Deadtime 2 Sets the second Reclose Delay (Dead time) in the P/F sequence.

79 P/F Prot’n Trip3 The third protection Trip in the P/F sequence can be set to either Inst or Delayed.

79 P/F Deadtime 3 Sets the third Reclose Delay (Dead time) in the P/F sequence.

79 P/F Prot’n Trip 4 The fourth protection Trip in the P/F sequence can be set to either Inst or Delayed.

79 P/F Deadtime 4 Sets the fourth Reclose Delay (Dead time) in the P/F sequence.

79 P/F Prot’n Trip5 The fifth and last protection Trip in the P/F sequence can be set to either Inst or

Delayed.

79 P/F HighSet Trips to Lockout 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.

79 P/F Delayed Trips to Lockout Sets the number of allowed Delayed trips, Relay will go to Lockout on the last

Delayed Trip. This function 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.

4.1.6 E/F SHOTS SUB-MENU

This menu allows the Earth Fault trip/reclose sequence to be parameterized:-

As above but E/F settings.

4.1.7 SEF SHOTS SUB-MENU

This menu allows the Sensitive Earth trip/reclose sequence to be parameterized:-

As above but SEF Settings, Note: - SEF does not have HighSets

Siemens 7SR12 Argus User Manual

Questions and Answers: