15SICAM P850/P855, 7KG85xx, Device Manual
E50417-H1040-C482-A6, Edition 10.2018
1 User Information
Application
The multifunctional SICAM P850/P855 devices record and process measurands and events according to
IEC 61000-4-30 Power Quality (PQ) standard. The devices are used on all voltage levels of power-supply
systems. SICAM P850/P855 devices are used in 1-phase systems, 3-phase systems, and 4-phase systems
(with neutral conductor). The devices are used primarily in power utilities but also in other industrial and
commercial applications.
In addition to the measuring function, SICAM P850/P855 features various recorders (average, min and max
values) to record the measurements in programmable time intervals. Waveform capture is available in both
devices. For recording functionality the devices feature a 2-GB memory for data storage.
In SICAM P855 additionally, long-term data for power quality evaluation and events are analyzed and output
as report according to power quality standards, for example, EN 50160 and flexible data export in PQDIF,
COMTRADE or CSV.
The input circuits for voltage measurement are galvanically isolated and can be used in IT, TT, and, TN
networks. To ensure galvanic separation for current measurements, the lines connected to the current
measuring inputs are galvanically separated from the current transformers.
The measurements are obtained from the alternating quantities of current and voltage supplied to the AC
inputs. When no external voltage and current transformers are used, the device can process rated input
alternating voltages of up to V
P-N
= 400 V (347 V for UL condition) and V
P-P
= 690 V (600 V for UL condition)
and rated input alternating currents up to 5 A.
The integrated web server can be used to set the parameters and display the measured values on HTML pages
from the connected PC or notebook. The softkeys located on the front of devices with an optional display
enable a limited parameterization and measured value output on the display.
An Ethernet interface and an optional RS485 interface are available for communicating with the control center
and other process automation systems. The RS485 interface supports the transmission of operating measured
values, counts and messages. The Modbus RTU or IEC 60870-5-103 communication protocol can be used,
depending on the device variant.
Measurands
The following measurands can be recorded or calculated from the measured quantities:
• Alternating voltage and alternating current
• Unbalanced of alternating voltage and alternating current
• Active, reactive, and apparent power
• Active, reactive, and apparent energy
• Power frequency
• Phase angle
• Power factor and active power factor
• THDS (Subgroup Total Harmonic Distortion) of alternating voltage and alternating current
• Harmonics of alternating voltage and alternating current
• Flicker acc. to IEC 61000-4-15 (only SICAM P855)
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