ENA460-PMU is a device for accurate synchrophasor measurements (PMU - Phasor Measurement Unit).

The measurement results are used for on-line detection of electrical grid status based on comparing the phase angle of the fundamental harmonic measured at different points of the distribution or transmission network using several devices in synchronized points in time. The ENA460-PMU hardware is based on the ENA analyzers, and is complemented by the GPS module for receiving synchronizing timestamps.

The ENA460-PMU firmware measures voltage and current phasors (with a Total Vector Error less than 0.5 %), frequency, calculates the positive symmetrical components of voltages and currents. It can apply measuring transformers error correction. The measured data is sent to the superior system according to the IEEE C37.118-2005 communication protocol.

Model ENA460-PMU consists of a processing unit (PowerPC CPU + FPGA ) and signal conditioning modules in a compact aluminum chassis with DIN rail.

Key features:

  • 4 galvanic isolated voltage inputs with antialiasing filters
  • 4 galvanic isolated direct current inputs with antialiasing filters
  • Galvanic isolated digital inputs and outputs
  • VxWorks operating system
  • Without the rotating parts

By default, the device fully complies with the requirements of IEEE C37.118-2005, which defines PMU accuracy in stabilized state and a communication protocol for real-time phasor transmission.


Technical specification:

Operating temperature -20 to +55 °C
Storage temperature -40 to +85 °C
Size 170 x 230 x 120 mm (h x w x d)
Weight 3.5 kg
Voltage inputs
Number of inputs 4
Input ranges 75 V, 150 V, 300 V, 600 V
Bandwidth 45 Hz to 3 kHz
Isolation 4200 V (50 Hz / 5 s), Ch-Ch, Ch-GND
Input resistance 600 kOhm
Total Vector Error 0.5 %
Current inputs
Number of inputs 4
Input ranges 1 A, 5 A (measurable to 2xIn)
Bandwidth 45 Hz to 3 kHz
Isolation 4200 V (50 Hz / 5 s), Ch.-Ch., Ch.-GND
Total Vector Error 0.5 %
Safety IEC 60950
EMC IEC 61000-6-2, IEC 61000-4-2 až 6
Analysis procedure IEEE C37.118-2005
Processor PowerPC 400 MHz
Storage 256 MB internal, nor 1 GB - 16 GB CF
Operating system VxWorks
Interface Ethernet, Fiber Optic
A/D converter 16 bits
Sampling frequency 12000S/s
Power supply 180 to 265 V AC, 47-63 Hz
Power consumption Max 20 VA