The PowerFactory Monitor (PFM) is multi-functional Dynamic System Monitor which fully integrates with DIgSILENT PowerFactory software. The PFM features grid and plant monitoring, fault recording, grid characteristics analysis by offering easy access to recorded data, analysis of trends, verification of system upset responses and test results.

Product Application

Unbundling of electricity supply systems and the introduction of new technologies in all areas of generation, transmission and distribution has made power system operation more complex. Supervision of generator performance according to Grid Codes and Connection Conditions, the stability supervision of large transmission networks at specific locations, verification of power quality criteria in distribution as well as the determination and analysis of key system parameters has generated the need for power system monitoring and grid supervision beyond classical fault recording and SCADA based trending systems. Under those aspects, wide area monitoring (WAM) via phase measurement units (PMU) is just one special feature out of all monitoring applications. The PowerFactory Monitor fully integrates with DIgSILENT PowerFactory software offering easy access to recorded data, analysis of trends, verification of system upset responses and test results.

Typical PowerFactory Monitor Applications:
  • Generation outage, load rejection and system frequency response analysis
  • Voltage stability monitoring and steady-state instability supervision
  • Power oscillation detection and analysis
  • System frequency control supervision, analysis and classification
  • Tie-line power exchange and network control characteristics
  • Control performance supervision and identification
  • Voltage dip classification and analysis
  • Power quality monitoring
  • Load parameter identification
  • Supervision of Connection Conditions and Ancillary Services
  • Wide Area Monitoring (WAM) via coordinated Phasor Measurement Units (PMU)

In addition to on-line grid supervising functions, the PowerFactory Monitor is an excellent high-end general purpose measurement instrument for all kind of plant tests typically performed to support device and plant modelling as well as parameter identification to allow for precise power systems simulation tasks.

Among these applications are:
  • Generator, motor and general feeder load tests and parameter identification
  • Power plant measurements and identification (AVR, exciter, PSS, turbine, boiler, hydraulic systems)
  • Determination of wind turbine characteristics and control behaviour
  • Optimal tuning of Power System Stabilizers (PSS)

The PowerFactory Monitor interacts perfectly with the DIgSILENT power system analysis software PowerFactory featuring seamless integration of system and plant tests, plant modelling and parameter identification.

Functional Overview

The DIgSILENT PowerFactory Monitor is an integrated, multifunctional data acquisition system that covers recording, monitoring and analysis of signals in all relevant time frames. It is especially designed to cover all needs of Transmission, Distribution and Generation on all voltage levels. Flexible hardware and software components allow for the configuration of portable systems, stand-alone cabinet mounted installations as well as LAN based multiple units, multiple location systems being coordinated and supervised via Master Stations.

Key functions which could be operated simultaneously are:
  • Fast and slow fundamental frequency signals recording (triggered and continuous)
  • Triggered instantaneous value recording
  • Phasor measurements
  • Event recording and power quality monitoring
  • Condition supervision and monitoring

Any quantity deviating from normal conditions is recorded and analysed. In addition, on-line analysis of signals is provided featuring the detection of inherent problems like system and control oscillations, deviations from connection conditions or power quality aspects. The PowerFactory Monitor is a stand-alone system including all necessary hardware and software functions for signal conditioning, signal conversion, data storage and processing, calculation and documentation. In addition, remote access is possible via modem, TCPI/IP networks, WWW and special SCADA interface techniques. Several monitoring systems can be synchronized to 1œs using GPS clock for precise parallel sampling, e.g. a basic requirement for system wide area phasor measurements.


Further material (brochure as well as IEC61850, IEC61010, and IEC61326 certificates) can be found on our Download Area.

Technical Specification

  • Up to 128 analog and 64 digital input channels
  • Up to 32 relay outputs for alarms
  • Scan rates up to 15,36 kHz, 16 bits resolution
  • Self-diagnostic, watch-dog and auto-boot
  • 2x750 GByte RAID, dual-CPU, 3 GB DRAM
  • 15” TFT screen
  • Control and Monitoring Unit, CMU (19” x 12HU)
  • Signal Unit, SU (19” x 4 HU)
Supply Voltage
  • 24-300 VDC and 110 / 220 VAC
Relay Outputs
  • 4x8 alarm output with Form C contacts
Analog Channels
  • 32 analog channels / Signal Unit (max. 4 SU per CMU); flexible input configuration
  • 1/5 A (nominal)
  • 150V (nominal)
Small signals
  • 1mV, 10mV, 1V, 10V, ±20mA
  • Better than 0.3%, CMR >85db
Digital Channels
  • Each Signal Unit is equipped with 8 relay outputs and 16 digital inputs.
  • Ethernet network 10/100/1000Mb/s, TCP/IP protocol
Control and Monitoring Unit
  • Dual CPU system, 3 GB DRAM, 2*750 GB RAID
  • 15” TFT screen
Recording Functions - Sampling Rate
  • Up to 256 samples per cycle
  • 50 cycles: up to 12.8 kHz
  • 60 cycles: up to 15,36 kHz
Fault-/Event Recording Stream
  • Pre-fault time: user selectable (typical: 0.1-5s)
  • Fault time: user selectable (typical: 1-20s)
  • Post-fault time: user selectable (typical: 0.1-5s)
  • Re-trigger: supported, various setting options
RMS-/Phasor/PQ Recording Stream
  • Pre-fault time: user selectable (typical: 1-100s)
  • Fault time: user selectable (typical: 10-900s)
  • Post-fault time: user selectable (typical: 10-900s)
  • Re-trigger: supported, various setting options
Continuous RMS/Phasor/PQ Monitoring
  • Sampling rate: 0.1-100 samples per second
  • Storage capacity: Up to 5 years (minimum)
  • Variables: Full flexibility (user defined)
  • Threshold and gradient on any input and user defined signal
  • Triggering on calculated quantities (signal oscillation, PQ criteria, etc.)
  • Manuel triggering on visually observed signals and test commands