Siemens siprotec SJ62 User Manual page 324

SIPROTEC 4, 7SJ62/63/64 Handbuch
C53000-G1140-C147-A, Edition 07.2015
criteria for start and end. The procedures ΣI
for this purpose. Figure 2-117 depicts the logic of the start and end criterion.
The start criterion is satisfied by the group indication "Relay TRIP" in the event of an
internal trip. Trips initiated by the internal control function are take into account for CB
maintenance, provided parameter 265 Cmd.via control is set such that the rele-
vant command is generated. A trip command initiated from an external source can be
considered if the indication „>52 Wear start" is produced simultaneously via
binary input. A further criterion can be the edge of the going indication „>52-a" in
order to signalize that the mechanical system of the CB has started moving to sepa-
rate the poles.
If the start criterion is satisfied, the configured CB operating time on tripping is
launched. It determines the instant in which the CB poles start going apart. As an ad-
ditional ex-manufacturer parameter, the CB operating time determines the end of the
tripping operation including arc extinction.
To prevent calculation procedures being corrupted in the event of CB failure, current
criterion 212 BkrClosed I MIN checks whether the current has really become zero
after two additional periods. If the current criterion satisfies the phase-selective logic
release, the calculation and evaluation procedures are triggered for each procedure.
Once they have been terminated, the end criterion of CB maintenance is satisfied and
it is ready for retriggering.
Please note that CB maintenance will be blocked if parameter settings are made in-
correctly. This condition is indicated by the message „52 WearSet.fail",
„52WL.blk n PErr" or „52WL.blk I PErr" (see section 2.1.6.2, „Power System
Data 2"). The latter two indications can only take effect if the 2P-procedure was con-
figured.
2.23 Auxiliary Functions
x 2
, 2P and I t make use of the same criteria
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