DIgSILENT PowerFactory Monitor
Integrated, multi-functional Dynamic System Monitor
Technical Overview
Hardware Configuration
The PowerFactory Monitor is based on a Control and Monitoring Unit (CMU) which can be equipped with up
to 4 Signal Units (SU) supporting in total up to 128 analogue channels (32 channels for the portable system)
and 64 event inputs being processed and analysed with a maximum scan rate of 15.36 kHz per channel at
a 16 Bit resolution. Each Signal Unit can accommodate different types of signal conditioning devices featuring
highest flexibility for direct connection of current- and voltage transformers but also low level AC/DC-voltage
and -current signals. Various PowerFactory Monitoring (PFM) Systems can communicate with the PowerFactory Master Station for
supervising the status of the PFM network, for collecting essential recorded information or for building a two
level monitoring structure for selective and most vital display and analysis functions.
Multi-time Frame Recording
Based on high speed signal data acquisition the
PowerFactory Monitor generates a number of different
data streams that allow for fault and disturbance
recording, event recording, power system performance
supervision, power quality recording as well as special
on-line signal generation such as real time phasors and
frequency monitoring.
Power System Performance Supervision
Fundamental frequency and phasor quantities (RMS)
are determined on basis of high precision softtransducers
with scan rates of up to 2-4 samples per
cycle being time tagged with a 1œs resolution.
High-speed recording of large amount of quantities
is typically triggered via threshold criteria on primary
signals or on basis of any criteria being derived from
flexible equations or analysis functions incl. oscillation
detection. Intelligent re-trigger functions are provided
to guarantee capturing of disturbance sequences which
may occur during catastrophic and extended network
upset conditions. Triggering is reported to the Master
Station initiating automatic upload of data should this
be requested by the overall monitoring setup.
Real Time Phasors
Based on the flexible setup of the PowerFactory
Monitor, frame and high level slot function definitions,
various specific measuring devices can be configured.
A typical application of such flexibility would be the real time phasor measurement where various phasor
quantities are derived from local information, stored,
analysed or passed on to remote systems for coordinated
stability evaluation.
Power Quality Recording
Capturing of voltage sags and high voltage conditions
along with the continuous monitoring and recording of
harmonic distortion, phase unbalance and other quantities
of interest, continuous power quality monitoring is
provided. Any recording such as captured voltage sags
or daily 24 hours power quality records can be kept
locally at the PFM or may be transferred automatically
to the Master Station for centralized storage and review.
Automatic Analysis
On basis of standard PowerFactory DPL scripts, the
PowerFactory Monitor features the automatic analysis
of monitoring data streams as well as recorded,
event triggered data sequences. This will allow a
preprocessing of the many recordings to determine
it’s severity and relevance for further expert analysis.
A typical standard feature of the automatic event and
monitoring analysis would be the performance of
automated printing of all recorded data sequences.