Phasor Measurement Unit

Phasor Measurement Unit - PMU PRO

per IEEE C37.118.1

IEEE C.37.118
IEEE 62055-118-7:2018

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 helping to prevent
power failures, analyzing those which did take place.

By interfacing Global Positioning System (GPS) receivers or clocks, or using Precision Time...

Full IEEE C37.118.1 / IEC 60255-118-1:2018 compliance for both:

M-Class
P-Class

Dual Protocol

IEC 61850-9-2...

Technical Specifications

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 compliant three-phase voltage, current, and positive and negative sequence phasor measurements synchronized to a common UTC time reference
IEEE C37.118.1 synchronous frequency and Rate of Change of Frequency (ROCOF) measurements
Clock synchronization to a UTC time reference using an IRIG-B timecode source or an IEEE 1588 PTPv2 master clock source
IEEE C37.118.2 commanded client-server UDP and TCP data transmission and spontaneous UDP data transmission over IP protocol
IEEE C37.118.2 reporting rates from 1 to 200/240 frames/s
Streaming of phasor data over Ethernet using the IEC 61850-9-2 multicast sampled value (SV) service with IEEE C37.118.2 compliant mapping of synchrophasor data upon IEC 61850-9-2 and IEC 61850-90-5 guidelines
Expected steady-state total vector error (TVE) at nominal frequency: < 0.05%
Streaming rate: 1 to 200 or 240 frames/s @ 50 or 60Hz, respectively
IEEE C37.118.2
• Synchrophasor data frames transmit a time stamped set of measurements that include phasor estimates, frequency deviation from the nominal power line frequency or actual frequency, and the rate of change of frequency.
• The data frame can be expanded to contain analog data (total active, reactive and apparent power, and power factor) and digital input status information.
• Phasor components can include three voltage and three current phasors, positive sequence voltage and current phasors, negative sequence voltage and current phasors, or all of them in one frame.
• Complex phasor values can be sent in a rectangular coordinates format (real and imaginary) or in polar coordinates (magnitude and angle).
• Phasor and frequency data can be represented in 32-bit IEEE floating-point format or as 16-bit scaled integer numbers. When using the integer format, the data conversion factors are provided in IEEE C37.118.2 configuration frames.
• 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)
• The PMU PRO supports CFG-1, CFG-2 and CFG-3 configuration frames.
• In spontaneous UDP data transmission mode, CFG-2 or CFG-3 configuration frames can be sent spontaneously without an explicit user command. When enabled, a configuration frame is sent periodically every 30 seconds.
5 data streaming slots for continuous synchrophasor data streaming via unicast UDP or/and TCP connections

Logging, Recording & Programming
Programmable controller: up to 32 control setpoints and half-cycle scan time
OR, AND, arithmetical functions logic, extensive triggers, programmable thresholds and delays, relay control, event-driven data recording
Event recorder for logging internal diagnostic events, power faults and operations of the logic controller and digital I/O
Eight data recorders with programmable datasets for data logging on a periodic basis and on any internal or external trigger
32 digital counters for counting internal events and pulses from external sources
16 interval timers with programmable periods from half cycle to 24 hours for periodic recording and triggering timed operations

Variable Current Inputs
5A
1A

Voltage Measurement Inputs
Measurement category: CAT III
Operating range: up to 277/480 VAC +25%

I/O
Built-in I/O
1 AI (±1 mA; 0-1 mA; 0-20 mA; 4-20 mA)
1 SSR (100mA/250V AC/DC)
External power supply 24/48/125/250V DC
1 DI
Internally wetted @ 24VDC
4 Relay Outputs
5A/30 VDC 100mA/800V DC
5A/250V AC
100mA/800V DC
4 Analog Outputs
Universal (configurable) isolated analog outputs (±1 mA; 0-1 mA; 0-20 mA; 4-20 mA)

Communication Interfaces
Two 10/100Base-T IEEE 1588 Ethernet ports with packet forwarding/routing capabilities; connecting to Ethernet through one or two different network switches, or daisy chaining multiple devices to a switch using a linear or ring network topology (daisy chaining is not available for PTP-enabled devices); up to 8 simultaneous TCP connections via Modbus TCP, DNP3, IEC 60870-5-104, IEC 61850 (up to 5 client associations, GOOSE and MSV publishers) protocols
Up to 5 TCP or/and UDP synchrophasor data streams via C37.118.2 protocol
Full speed USB 2.0 type C port for local configuring and monitoring the device via Modbus RTU protocol
RS-485 serial communication port; 2400 to 115200 bps; Modbus RTU/ASCII, DNP3 and IEC 60870-5-101 protocols (the port is not operational if the IRIG-B time synchronization source is used)
Modbus TCP notification client
Expertpower client

Display
High contrast 1.77” TFT color graphics display with configurable backlight
Multi-page displays; time, instrumentation and service data
Menu-driven setups
Multilanguage support

Real-Time Clock & Synchronization
High-accuracy real-time clock with a lithium backup battery
Clock synchronization to a UTC time reference using an IRIG-B timecode source or an IEEE 1588 PTPv2 master clock
Daylight saving time shift for local time indication with configurable DST start and end time