Motor Statistics; Setting Notes - Siemens SIPROTEC 7SK80 Manual
Motor protection
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Also See for SIPROTEC 7SK80:
- Manual (512 pages) ,
- Product information (80 pages) ,
- Manual (62 pages)
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Commissioning
Usually, no measures are required for commissioning. However, should the protection device be exchanged
(e.g. old circuit breaker and a new protection device), the initial values of the respective limit or statistical values
must be determined via the switching statistics of the respective circuit breaker.
2.18.2.3 Motor Statistics
General
There are two different types of statistical motor data:
• Operational information and
• startup information.
The statistical operational information contains the
• total number of motor startups
• total number of the motor operating hours (including startup conditions)
• total number of motor shutdown hours
• percentage of motor operating time and the total megawatt hours (if the device has a voltage transformer).
For every motor startup
• the duration
• the startup current
• and the startup voltage (if the device has a voltage transformer) are stored in the startup information.
Motor Operation Information
The motor operation statistic is newly calculated in a 600 ms cycle. In the statistics buffer, its image is de-
creased to a resolution of one hour.
Motor Startup Information
The motor startup current and the startup voltage (if the device has a voltage transformer) are indicated as
primary values. The measurement of these statistical values is initiated upon energization of the motor. This is
recognized as soon as the threshold value of the circuit breaker position detection (parameter 212 BkrClosed
I MIN) is 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 un-
dershoots 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.
2.18.2.4 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.
SIPROTEC, 7SK80, Manual
E50417-G1140-C344-A4, Release date 08.2010
Functions
2.18 Auxiliary Functions
251
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