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Phasor Measurement Unit

A Phasor Measurement Unit, or PMU for short, is the essential building block in the platform called Wide Area Monitoring System (WAMS).
These systems were developed to provide an overall real-time health check of nation-wide transmission grids, predicting and hopefully preventing power failures, analyzing those which did take place.

The SATEC PMU is a unique product. It is implemented as an add-on card for the PM180, together with other functionalities, such as power quality monitoring and fault recording, making it highly cost-effective. It communicates with 3rd party Phasor Data Concentrators, an important WAMS component in itself, enabling versatility.


Full IEEE C37.118.1 compliance, for both:

  • M – Class
  • P – Class

Full interoperability, featuring:

  • IEEE C37.118.2 protocol
  • IEC 61850-9-2 protocol
  • 5 streaming slots
    (UDP and TCP protocol)

Optional clip-on CTs: no outage needed!

Versatile micro-sec resolution time sync:

Expected steady-state total vector error:
(TVE): < 0.05%

Phasor Measurement Unit

  • IEEE C37.118.1-2011, IEEE C37.118.1a-2014 and IEC/IEEE 60255-118-1:2018 P-Class and M-class performance compliance
  • IEEE C37.118.1 3-phase V/I phasor measurements synchronized to a common UTC time reference (e.g. GPS), using an IRIG-B timecode source or an IEEE 1588 PTPv2 master clock source
  • IEEE C37.118.1 synchronous frequency and Rate of Change of Frequency (ROCOF) measurements
  • Expected steady-state total vector error (TVE): < 0.05%
  • Streaming rate: 1 to 50 or 60 frames/s @ 50 or 60Hz, respectively
  • IEEE C37.118.2
    • Selectable phasor type: phasor data only; positive sequence only; phase data + positive sequence
    • Client-server UDP and TCP data transmission; spontaneous UDP data transmission over IP protocol
    • Optional IEEE C37.118.2 frame extensions with analog data (total active, reactive and apparent power and power factor) and digital status data (up to 32 inputs)
    • Spontaneous/unsolicited transmission of CFG-2 / CFG-3 frames. When enabled, the CFG frame is sent once before the start of transmission in unicast UDP/TCP modes and periodically every 30 seconds in multicast/spontaneous UDP mode
  • Phasor data streaming over Ethernet using IEC 61850-9-2
    multicast sampled value (SV) service with IEEE C37.118.2 compliant mapping of synchrophasor data in accordance with IEC 61850-9-2 and IEC 61850-90-5 guidelines
  • 5 data streaming slots for continuous synchrophasor data streaming via unicast UDP or/and TCP connections


  • Class 0.2S per IEC 62053-22
  • Class 0.2 per IEC 61557-12

Power Meter

  • Power: True RMS volts, amps, power, power factor, neutral current, angles and unbalance for voltage and current, frequency, symmetrical components and many more
  • Event and parameter data-logging
  • Sampling frequency: up to 1024* samples per cycle
  • KYZ or KY output and LED indication for calibration and test (via optional display)

*using the transient module

Power Quality

  • NMI certified for Class A, Edition 3, per IEC 61000-4-30
  • EN50160 / IEEE1159 / GOST 32144 monitoring, statistics & reports
  • Event statistics complimented by waveform recording
    in 8 channels (4 voltage inputs, 4 current inputs) @ 256/1024 samples/cycle
  • V-I angle, THD, TDD and K factor for Voltage and Current and up to the 63rd order harmonic. individual harmonics for V, I, P, Q
  • Including directional power harmonics (Load or Source)
  • Inter-harmonics
  • Disturbance Direction Detection (upstream/downstream)
  • Flicker according to IEC 61000-4-15
  • Detecting transients as short as 17μs

Logging, Recording & Programming

  • Programmable controller: up to 64 control setpoints, up to 8 conditions OR, AND, arithmetical functions logic, extensive triggers, programmable thresholds and delays, relay control, event-driven data recording
  • Supports IEC 61131 PLC Configuration (LD, FBD)
  • 8 fast waveform recorders: simultaneous 8-channel AC, one DC: up to 48 digital inputs in a single plot
  • Waveform sampling rate 32, 64, 128 or 256 samples per cycle; up to 20 pre-fault cycles (2 cycles of 1024 samples per cycle or 4 cycles with 512 samples per cycle with Transient Module)
  • Up to 3.5 min. of continuous waveform recording
  • 1-ms resolution for digital inputs
  • 16 fast Data Recorders (16 parameters on each data log): From ½ cycle RMS to 2 hour RMS envelopes; up to 20 pre/post-fault cycles; programmable data logs on a periodic basis and on internal or external trigger
  • ½-cycle response time
  • 32 digital internal counters
  • 16 internal programmable timers (½ cycle to 24 hours)

Variable Current Inputs

  • 5A
  • 1A
  • HACS: special 40mA inputs for SATEC’s High Accuracy Current Sensors
  • CS1S: specific inputs for 100A split-core HACS, calibrated to 5A
  • CS1H: specific inputs for 100A HACS handheld current clamps, calibrated to 5A
  • 3V AC: inputs for generic current clamps (Rogowski)
  • 200A @ Digital Fault Recorder module

Voltage Measurement Inputs

Available options:

  • 120V AC Nominal voltage
  • 690V AC Nominal voltage

Operating range:

Wide range application up to 828V AC

5th AC/DC voltage input:

monitoring substation battery (up to 300V DC)

Digital I/O

16 Digital Inputs

available options:

  • dry contact sensing: 24V DC Internal power supply)
  • wet contact sensing:
    External power supply 24/48/125/250V DC

8 Relay Outputs
Electromechanical (SPST Form A)

available options:

  • 8A/250V AC
  • 5A/30 VDC
  • 0.25A/250V DC
  • 5A/24V DC


Combo: 8 Digital Inputs + 4 Relay Outputs

Available as:

  • 8DI/4RO EMR 24V
  • 8DI/4RO SSR 24V
  • 8DI/4RO EMR 125V
  • 8DI/4RO SSR 125V
  • 8DI/4RO EMR 250V
  • 8DI/4RO SSR 250V

Communication interfaces


  • RS-485
  • USB
  • ETH 10/100Base-T
  • IRIG-B

Optional/additional: (1 per device):

  • Fiber optic ETH; incl. redundant ETH and 2nd RS485 port
  • 3G GSM; incl. 2nd RS485 port

Communication Protocols

  • Modbus
  • DNP3.0
  • IEC 60870-5-101/104
  • IEC 61850

Display Options

  • Transducer version: no display. Installed on DIN-rail
  • Graphic color display: supplied with a 5.7″ touchscreen
  • LED Display: 3 line ultra bright LED display

Real-Time Clock & Synchronization

  • Real-Time Clock with maximum 5 seconds drift per month @ 25°C
  • Provides 1 msec time resolution via IRIG-B time code input or satellite clock for common time base (requires IRIG-B module)
  • As an SNTP client, it can accept periodic synchronization of the meter clock from an SNTP server
  • Time sync from digital input with 1ms accuracy

Power Supply

Built-in: 85-265V AC / 88-290V DC

Additional options:

  • AUX 85-265V AC / 88-290V DC
  • AUX 9.6-35V DC

Enhanced Meter Security

  • 3 levels Password security for protecting meter setups and accumulated data from unauthorized changes
  • Defining up to 20 users in different access levels
  • Extra-complex password is required
  • Access and configuration log is automatically and continuously recorded, documenting all user activity


  • 19″ rack installation
  • DIN Rail mount
  • panel mount

Complies with EN50022


For all downloads available for the PM180 analyzer, please go to the Downloads tab on the PM180’s main page.


Automation & Control Modules

Digital Inputs

16 inputs (total up to 48 DI)
Optically isolated dry/wet contact
Scan time: 1ms @ 60Hz, 1.25ms @ 50Hz
24/125/250V DC

Relay Outputs

8 relays (Total up to 24 RO)
8 relays rated at 8A/250V AC, 5A/24V DC, 0.25A/250V DC

  Analog Inputs/Outputs

4AI and 4AO (Total up to 12AI / 12AO); Ranges:

  • ±1mA (with 100% overload)
  • 0-20mA
  • 0-1mA (with 100% overload)
  • 4-20mA

Accuracy Class 0.2S FS
Scan/update time: 2 cycles

Communication Ports

IRIG-B module

  • Optically isolated IRIG-B port
  • Second RS-422/485 COM port

TXFX module

  • Redundant Ethernet port
  • 10/100 Mbit with RJ45 connector
  • 100Base FX with SC connector
  2G/3G cellular modem

  • Antenna connection: SMA
  • Supports UMTS/HSPA+ bands: 800/850/900/AWS/1900/2100

Measurement / Fault Channels

Transient Recorder Module

Records voltage transients of up to 2kV (L-G) at 1024 samples/cycle per channel

Fault Recorder Module

Additional current input offers separated metering & protection CT connection, records current faults of up to 200A (40*In)

PMU Functionality

Phasor measurement unit (PMU) provides synchrophasor and frequency measurements compliant with the IEEE C37.118.1 P performance class, and real-time cyclic exchange of synchronized phasor data with the substation phasor data concentrator (PDC) based on the IEC 61850-9-2 sampled value (SV) service.

Redundant Power Supply Module

Auxiliary Power Supply

  • 50-290V AC and 40-290V DC, 20W
  • 9.6-35 V DC, 20W

(max. one auxiliary power supply per PM180)


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