Siemens SIPROTEC 4, User Manual

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exceeded in at least one phase. A requirement for this is that all three phase currents were previously below
the configured threshold value.
The end of the startup time measurement is triggered as soon as the largest of the three phase currents
undershoots the startup current as set in parameter 1107
I MOTOR START
for at least 300 ms.
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 Σ
Ι
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 2-142 Illustration of the CB times
2.25.2.4
Functions
2.25 Auxiliary Functions
SIPROTEC 4, 7SJ62/64, Manual 327
C53000-G1140-C207-8, Edition 08.2016