Woodward SEG HighPROTEC MRA4, Device Manual

Page: 440 / 510

AR-Protection Module – Automatic Reclosure [ANSI 79]
Commissioning: Automatic Reclosure [ANSI 79]
Object to be tested
AR function of a (current) protective function
Necessary means
•
Current source or, if the protection is directional - current and voltage source
•
Timer
Procedure
Supervision time > start time > longest tripping time of an AR current
protective function.
Supervision time and start time are parameterized via the AR function. The
tripping time is parameterized via the protective function.
•
Switch the CB on.
•
Wait until the blocking time »t-Superv« has expired. The supervision time ensures that the AR wont be
started after a manual switch on of the CB.
•
Feed trip causing currents.
•
As soon as the trip occurs, switch the current off (immediately).
•
After expiry of the dead time the CB should reclose.
Only tripping commands that are given within the active time of the AR will
activate the function (reclosure attempts). Therefore make sure, that the
tripping time is shorter than the starting time (mains calculated)!
•
If more than one attempt is parameterized, with each reclosure of the CB, the current quantity which is
applied to the current measuring inputs has to be high enough to result in tripping. The test should be
continued until all set AR attempts have been carried out.
The number of attempts permitted can be found in the Technical Data
provided by the CB manufacturer. The specified dead times have to be
kept.
Successful test result
The AR test is successfully completed when the last AR attempt also results in tripping.
Page 440 EN MRA4 04/09