If the motor startup current (parameter 1107 I MOTOR START) is not exceeded after energization detection
or if the current falls below the motor startup current within 500 ms after energization detection, then this is
not considered being a motor startup. No statistic is created.
Setting Notes
Reading/Setting/Resetting Counters
The SIPROTEC 4 System Description provides a description of how to read out the statistical counters via the
device front panel or DIGSI. Setting or resetting of these statistical counters takes place under the menu item
MESSAGES —> STATISTICS by overwriting the counter values displayed.
Circuit Breaker Maintenance
Under address 172 52 B.WEAR MONIT one of the alternatives ΣΙ
x
procedure, 2P procedure, Ι
2
t procedure or
Disabled can be set. All parameters relevant to this function are available at parameter block P.System
Data 1 (see Section 2.1.3 Power System Data 1 ).
The following setting values are important input values the subfunctions require in order to operate correctly:
The
CB Tripping Time is a characteristic value provided by the manufacturer. It covers the entire tripping
process from the trip command (applying auxiliary power to the trip element of the circuit breaker) up to arc
extinction in all poles. The time is set at address 266 T 52 BREAKTIME.
The CB Operating Time T 52 OPENING is equally a characteristic value of the circuit breaker. It covers the
time span between the trip command (applying auxiliary power to the trip element of the circuit breaker) and
separation of CB contacts in all poles. It is entered at address 267 T 52 OPENING.
The following diagram illustrates the relationship between these CB times.
[ls-zeiten-120304-he, 1, en_US]
Figure 2-79
Illustration of the CB times
Current flow monitoring 212 BkrClosed I MIN, which some protective functions rely upon to detect a
closed CB, is used as the
current zero criterion. It should be set with respect to the actually used device func-
tions (see also margin heading “Current Flow Monitoring (CB)” in Section 2.1.3.2 Setting Notes.
2.17.2.4
Functions
2.17 Auxiliary Functions
SIPROTEC 4, 7SJ61, Manual 203
C53000-G1140-C210-6, Edition 05.2016
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