Siemens SICAM, Руководство пользователя, Страница: 38 / 174

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NOTE
For the temperatures below -20 °C, the LCD display can take up to 2 min to start or display the data.
DO Configuration
The digital output (DO) is configured to indicate either the
fault direction
or the
device-health
status by using the
DO configuration
parameter.
If the DOs are configured to indicate the
fault direction
:
•
DO1 operates to indicate a forward fault direction and DO2 operates to indicate a reverse fault direction.
•
Operation of both DOs indicates that the fault direction could not be determined.
If the DOs are configured to indicate the
device-health
status:
•
DO1 operates to indicate an unhealthy device (DO2 is deactivated).
•
If both DOs do not operate, this is an indication that the device is healthy.
The
DO configuration
can only be switched if SICAM FCM does not indicate any faults.
For more information about the
DO configuration
parameter, refer to DO Configuration, Page 123 .
Operating Modes
The device goes to the sleep mode when disconnected from an auxiliary supply. In this mode, the communi-
cation with the RTU is not available. In the sleep mode, you can press any of the keys to view the events.
The device enters the deep sleep mode after 8 hours in the sleep mode and requires an auxiliary supply to
recover from this mode.
Correction Factors for LoPo VT and LoPo CT (IEC 61869-10, IEC 61869-11)
IEC 61869-10 and IEC 61869-11 allow to adjust the magnitudes and phases of current and voltage sensors. If
any inaccuracies are stable within the measuring range, then the overall accuracy of sensors is improved to
higher level.
•
Sensors which specify individual correction factors on their labels and in routine tests can be configured
in SICAM FCM to improve system accuracy.
•
Sensors which are used in combination with SICAM FCM and do not have correction factors, disable the
respective correction factors. In this way, the device works with secondary values as measured without
any influence on magnitudes and phase angles.
The correction factors are expressed in terms of magnitude and angle offset per phase of voltage/current. By
enabling the
Correction Factor
parameter via HMI or Modbus, then the device applies these correction
factors to improve the measuring accuracy of the sensor.
The correction factor works as per the following logic:
•
The measured phase-to-ground voltages and measured phase currents/ground currents are multiplied by
the respective voltage and current magnitude factor.
•
The measured phase-to-ground voltage and phase currents/ground current angles are added for positive
angle offset or subtracted for negative angle offset.
•
The correction factor is applied on all measured values and reflects on all derived values.
If
Correction Factor
parameter (holding register address 79) is set to 0 (disabled), then the correction
factors with the holding addresses 80 to 91 are set to 0 and not applied in voltage/current measurements.
4.1.8
4.1.9
4.1.10
Device Functions
4.1 Description
38 SICAM, Feeder Condition Monitor, Manual
E50417-H8940-C580-A4, Edition 03.2019