ENA-NXG Monitoring Hardware


ENA-NXG Monitoring Hardware

Basic informations

ENA-NXG is based on modular architecture, allowing combination of one CPU module and up to six selected input modules into one meter. The input modules are providing input signal isolation, filtering and A/D conversion, sending the data using digital backplane bus. The CPU module is equipped with FPGA receiving all digital input data, and the real-time controller running meter firmware and providing all interfaces and data storage.

Resulting meter functionality is based on the selected input module type and count, and on the meter firmware.

Functionality

Power Quality (PQ)
The firmware calculates power quality parameters according EN50160 fully follows requirements described in IEC 61000-4-30 Class A and others (61000-4-7, 61000-4-15).

Main measurement functions are:

  • U, I, P, Q, S, frequency, THD U, THD I, power factor, energies – AP, AQ, AS, APin, APout, all quantities are per phase and total
  • Harmonics – U and I, up to 50, optionally also power harmonics
  • All quantitates are calculated on 200 ms (10/12 period basis) according to IEC 61000-4-30
  • Voltage quality according to EN50160, IEC 61000-4-30 Class A (U, freq., THD U, flicker, unbalance, harmonics)
  • Voltage events according EN50160, IEC 61000-4-30 Class A (dip, swell, interruption – time, extrema, length)
  • Waveform capture – in case of trigger, the device captures the waveform
    • Trigger can be activated by selected quantities (U, I, P, Q, S, freq., PF) crosses specified limits
    • Waveform means raw voltage/current signal with sampling rate at 192 or 256 samples/period, waveform length is 50 periods (0,2 s pre-trigger, 1 s length)
    • Waveforms are stored in files in standard protocol and the device is able to hold at least 100 of them in local storage
  • Data are provided in two ways:
    • Real-time – using standard protocol (MODBUS), refreshed every 200 ms, all above mentioned quantitates
    • Historical – the device calculate (gapless) true RMS/average of all above quantities in user predefined interval, for example 1 minute and store these data in files in standard protocol (comma/tab separated txt file). The device is able to hold these data/files for 12 months at minimum in local storage (SD card).
       The historical data also includes voltage events details according to EN50160

Modules

CPU
ENA‑NXG‑CPU.ACPU module based on NI-SOM (667 MHz dual-core, FPGA, real-time OS, NI LabVIEW) with 8-32 GB SD card,Ethernet, serial port, USB for data download and direct     PC connection, 24 V DC power is required
ENA‑NXG‑CPU.BENA-NXG-CPU.A extended with integrated GPS receiver
ENA‑NXG‑CPU.CENA-NXG-CPU.A extended with fiber optic interface for ENA-TIR (ENA-TIR is external GPS receiver)
All analog input modules are providing 24 bit sigma-delta A/D conversion
ENA‑NXG‑HVI.A4 channel high voltage input module, 300 V RMS range (measuring up to 600 V RMS), 6 kV isolation.
 Used for direct voltage measurement
ENA‑NXG‑HVI.BENA-NXG-HVI.A with additional 4 low voltage input channels, 1 V RMS range, 2.5 kV isolation.
Additional inputs are used for indirect current measurement using XX Amp / 0.33 V CTs.
 This single module can cover one 3-phase system (4U, 4I)
ENA‑NXG‑LVI.A16 channel low voltage input module, 1 V RMS range
2 channels can be switched to temperature measurement/PT1000.
 Used for indirect current measurement (XX Amp / 0.33 V CTs)
ENA‑NXG‑LVI.B8 channel low voltage input module, 1 V RMS range
Used for indirect current measurement
 (XX Amp / 0.33 V CTs)
ENA‑NXG‑HCI.A4 channel current input module,
1 A RMS range
 Used for indirect current measurement (XX Amp / 1 A CTs)
ENA‑NXG‑HCI.B4 channel current input module,
5 A RMS range
 Used for indirect current measurement (XX Amp / 5 A CTs)
ENA‑NXG‑DI16 channel digital input module