ENA8000

Power Quality acc. to
IEC 61000-4-30 ed.3

Functionality

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, I, P, Q up to 50th harmonic, U and I also as 200Hz spectra (0-9 kHz)
• Symmetrical components – three-phase system de composition into a positive, negative, and zero component
• 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 (transients) – 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 9,6 k/19,2 k per second, waveform length is up to 60 periods, with pre-trigger up to 1.2 second
• Disturbances – in case of trigger, the device captures the half-period RMS quantities
  • Trigger can be activated by selected quantities (U, I, P, Q, S, freq., PF) crosses specified limits
  • Capture contains half-period quantities of voltage, current, frequency, power etc. (sampling rate is 100 samples per second), capture length is up to 15 minutes, with pre-trigger up to 30 seconds
• Device is controlled by ENA-Touch application, data is viewed in ENA-Report

Parameters

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, each harmonic up to 50th (optionally up 180th), optionally supraharmonics 2-9kHz spectra
• 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

Phasor Measurement (PMU)

PMU – Phasor Measurement Unit is a device for accurate synchrophasor measurements using GPS.
The 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. The measurement results are used for on-line detection of electrical grid status based on comparing the phase angle of the funda-mental harmonic measured at different points of the distribution or transmission network using several devices in synchronized points in time.

Feeder Monitoring (MFM)

Meter input modules can be combined in a way of measuring one 3-phase voltage and multiple 3-phase current systems. The intention of such meter is typically to monitor the distribution transformer powering multiple output feeders.
Functionality of multi-feeder-monitor is similar to PQ meter, with possibility to measure up to 10 3-phase feeders in total. Multi feeder monitor also provides detailed information about power and energy consumption of each feeder.

Mixed/Custom Functionality

The ENA-NXG is flexible hardware and software platform. It allows mix of different input modules count and type, allowing to build device following end user needs. Also the firmware functionality can be prepared as a mix of above mentioned functions, and additional user requirements can be applied into the firmware.
In special cases ENA-NXG platform can be provided as open OEM system with set of development examples for customer’s own development.

Functionality

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:

• FFT analyzer of harmonics and interharmonics according to IEC 61000-4-7 (storage of U, I, P, Q, S for each harmonic)
• Oscilloscope
• Vectorscope
• Power and energy monitor
• Flicker meter according to IEC 61000-4-15
• Voltage monitor according to EN 50160 (calculation acc. IEC 61000-4-30 standard, class A)
• Transient recorder for analog and digital signals (up to 66 seconds of voltage/current waveforms with up to 2 seconds pre-trigger, sampling rate up to 57 600 Samples/second)
• Disturbance recorder (half-period values including frequency, length of record 1-10 minutes with up to 1 minute pre-trigger)
• Signaling voltages monitor
• Alarm monitor
• Symmetrical components analyzer
• Network impedance analyzer
• Half period U+I extremes monitor

Parameters

ENA-NXG Basic

Simple setup and control tool for ENA-NXG

ENA-SCADA – Server for PQ Analyzers

ENA-SCADA is distributed system for Power Quality analyzers (PQ). Software can communicate with hundreds of meters, and can support also third party PQ meters.

• Complete on-line and historical data
• Power quality evaluation acc. EN50160
• Supervision, Energy, Reports
• On-premise solution or cloud service

Main Features

Automatic reading of real-time and historical data
Communication using device specific protocols and formats.

Storage of all historical data into SQL database
All historical data, protocols, supervision records etc. Are stored in the SQL database. Data is not encrypted, and it is also available to other users with sufficient user rights.

On-line data
Actually measured quantities are displayed in the table, graph, as V/f profile, vector spectra or on the map.
User is able to view last disturbance or transient including waveform for each measurement system.
It is possible to display values for each phase, and total values also.

Historical data
Archived data are displayed in the graphs, as historical FFT (Spectral display), EN50160 evaluation, energy (hourly/daily), events list, events statistics, reports list.

Geographical visualization
ENA-SCADA provides basic information about actually measured voltage and frequency in the geographical view. User can view all substations/areas where analyzer(s) are installed. Each substation/area shows actual state based on actual voltage level (under/over voltage etc.). Supervision map indicates possible device fault condition.

Reports
User is able to easily export every viewed panel to PDF protocol including basic measurement information. Automatic reports are also available to be configured for events (disturbances and transients).

Notifications
System is able to send notifications automatically and to add a report (if available) under certain circumstances. Sending may be triggered by the event on a device (Voltage Event, Transient record detected) or by the supervision event.

Supervision
The powerful supervisory management monitors each device status and its fault state. Supervision overview distinguishes between two states: OK and Failed. Available function for monitoring are: ping, sw running, data storing, data in the database.

Providing data to other systems
System ENA-SCADA can communicate with other systems, and also can provide its own data to any third party systems – web-service, SQL, MODBUS/TCP.

Additional Features

EN50160 Evaluation

The EN50160 Evaluation contains a table with statistical evaluation of all required measurements according to EN50160 standard for selected time period (months or weeks).

Hierarchical tree view of all meters (substation, area etc.)
User can search for a specific device either by expanding the tree structure to the desired level, or simply find device using the Device Search Box.

Virtual Energy Meter
Virtual energy meter is a special type of instrument in an application that consists only of a list of positive and negative real meters.
Its historical data (energy) can be viewed in the same way as from real devices, the server automatically calculates the sum of positive and negative components.
Usage – if the input and all outputs of the local network are monitored, the total balance (losses) can be displayed.

Events (PQ, Waveforms)
Automatically generated events list captured by meter itself or captured by Master Station (custom events): Alarm, Voltage harmonic alarm, Voltage alarm, Transient, Disturbance, EN50160 event, Custom event. It is possible to show last transient for each system. Displayed are two 200ms waveforms. It is able to show last disturbance for each system. Displayed are 60 seconds of half-period voltage and frequency waveforms including 5 seconds pre-trigger. Auto-print the newest disturbance.

Events (Supervision)
SCADA uses „ping“ command and awaits echo reply to determine whether the analyzer is accessible or not. System also checks, if software on the ENA analyzer is running, if data storing is enabled, if data from analyzer was copied to the database (including „database full“ detection).

Vizualization – Actual Values
Tables
Graphs – Last 1 minute, 10 minutes, 1 hour
Last Waveform/Disturbance
Vector Diagram & Harmonic Analysis
Maps
Supervision – Quick Overview

Vizualization – Historical Data
Graphs
FFT Analysis
Histograms
Energy Profile
EN50160 Evaluation
Events (PQ, Waveforms)
Events (Supervision)

Vizualization – Configuration
Devices
Users
Substations/Areas
Protocols
Notifications
Supervision