Specification for a Handheld Power Quality, Harmonics and Energy Analyzer: MAVOWATT 70
1.0 Scope
1.1. This specification is for an instrument also known as a Power Line Disturbance analyzer or a Power Monitor. This specification is based on the requirements for a handheld graphical recording instrument to monitor and record irregularities or disturbances occurring in the AC power (Power Quality) that is typically found in circuits in industrial, commercial, and residential applications. This also includes variations in RMS voltage or current, short-term transients, power line harmonics and inter-harmonics, and other parameters including, but not limited to DC voltage, DC current, Watts, VA, VARS and PF.
2.0 Instrument Characteristics
2.1. The instrument shall be completely self-contained with full measuring and report analysis functions. No PC based software shall be required to set up the instrument or review data.
2.2. Measurement capabilities shall include Power Quality analysis, harmonics, inter-harmonics, energy and demand monitoring for AC and DC power
2.3. The instrument shall comply fully with IEC 61000-4-30 Class A requirements. In accordance with IEC 61000-4-30 the instrument shall also comply with
2.3.1. IEC 61000-4-7, harmonics
2.3.2. IEC61000-4-15, flicker
2.4. A certificate of compliance with IEC61000-4-30 Class A shall be provided from an independent test laboratory that is not affiliated with the products manufacturer.
2.5. The instrument shall also measure in accordance with IEEE 1159 (power quality), IEEE519 (harmonics).
2.6. The instrument shall have a ¼ VGA color back lighted LCD display with the capability to display menus for setup, waveforms, data review and numerical reporting for each channel. Simultaneous real-time waveform display shall also be available for all channels while monitoring is enabled.
2.7. The analyzer shall have a color touch screen user interface and not dedicated keys for entry of information and display selection.
2.8. The instrument shall be capable of simultaneous monitoring; employing four (4) differential voltage channels and four (4) differential current channels.
2.8.1. The sampling rate for each voltage and current channel shall be 256 samples per cycle.
2.8.2. Each voltage channel is capable of measure AC or DC voltage.
2.8.3. Voltage range: 10-600Vrms.
Accuracy: ±0.1% reading ±0.05% full scale
2.8.4. Voltage transients: 50-1000Vpk; with transient option.
Accuracy: ±10% reading ±0.5% full scale
Transient recording method: High speed digitization with at least 1 µs sampling rate
2.8.5. Each current channel is capable of measuring AC or DC current.
2.8.6. Current range: 10 - 200% of full-scale current probe rating
Accuracy: ±0.1% reading ±0.05% full scale (at fundamental, plus current probe accuracy)
Current transients: ±10% reading ±0.5% full scale + current probe accuracy with transient option.
2.9. The instrument shall monitor and measure power systems that fall into two out of the three following fundamental frequencies 16/20, 50/60 and 400Hz. One instrument shall support at least two of these ranges.
2.10. The analyzer shall have an optical serial communications ort for downloading of recorded data to a PC.
2.11. The instrument shall have optional RS232, USB and Ethernet communications. The manufacturer shall provide software to transfer data from the instrument to the PC using one of these communications methods.
2.12. The analyzer shall have a built-in, un-interruptable power supply capable of providing up to two (2) hours of operation. The analyzer must also be capable of starting from battery. The instrument shall also be able to be powered from an available AC source.
The internal battery shall be charged while internal to the instrument when the AC supply is available. Charging does not disable or affect any measurement capabilities of the instrument.
2.13. The analyzer shall have an automatic configuration feature that senses the nominal voltages, nominal current, wiring configuration and line frequency when connected to the circuit under test. Upon sensing these values the automatic configuration feature will automatically configure the instrument in accordance with IEEE or IEC standards.
2.14. The instrument shall be able to start monitoring and recording in 4 key strokes (user touch screen selections) or less.
2.15. The instrument shall have the standard ability to monitor and record True RMS voltage and current, Real Power (Watts), Power Factor, Apparent Power (VA), Reactive Power (VAR), Voltage and Current Crest Factor, Voltage and Current Total Harmonic Distortion and Total Inter-harmonic Distortion. Transformer K Factor, voltage unbalance and DC voltage and current simultaneously.
2.16. The instrument shall measure demand on user-selected intervals and sub intervals. Additionally, the instrument will measure the energy (kWh) over the monitored period.
2.17. The analyzer shall allow the operator to view input signal waveforms in real-time and have readings continuously updated and recorded.
2.18. The analyzer display shall allow the operator to view voltage and current phasor diagrams graphically, in real-time, with continuous updating.
2.19. The analyzer shall have the ability to generate a report for a variety of trigger conditions; limit crossing of any of the monitored parameters.
3.0 Event Memory and Data Storage
3.1. The analyzer shall record both event data and timed readings simultaneously.
3.2. Event data recordings are triggered events that occur when measurements exceeding thresholds either automatically configured by the instrument or manually set by the user.
3.3. Timed readings shall be based on 4 independent timers for different categories of measured/computed parameters. The 4 categories shall be: Power values (RMS V, I, W, etc), Demand & Energy, Harmonics and Flicker.
3.4. The analyzer shall have sufficient internal memory to store data for up to 60 days of KW demand information based upon a 5 minute sampling interval.
3.5. The analyzer shall support industry standard removable compact flash memory in variable sizes.
3.6. All data and setups are directly recorded to removable compact flash memory of at least 4GB in size. Compact flash memory card shall be compatible with industry standard USB, PCCARD and other readers to transfer data to a PC.
4.0 Harmonic Analysis
4.1. The Analyzer shall support harmonic analysis of each voltage and current channel up to the 63rd harmonic. Harmonic analysis shall be in accordance with IEC61000-4-7.
4.2. The instrument shall have the ability to trend/journal/trigger on each harmonic frequency.
4.3. The instrument shall have the ability to trend/journal/trigger on up to four user selectable frequency intended for inter-harmonic analysis. The user selectable frequency shall be any frequency that is a multiple of 5Hz.
4.4. The Analyzer shall measure VTHD, ITHD, VTID, ITID, TDF, TIF and other harmonic/distortion type parameters.
5.0 Intelligent Analysis Algorithms
The analyzer shall assist in troubleshooting by quickly identifying the direction, or source, of the problems before and after they occur.
5.1. The following wave shape analysis algorithms shall be available as a standard feature:
5.1.1. Voltage sag directivity. This algorithm shall analyze all voltage sags recorded in real time for the purpose of determining the direction of the voltage sag as being upstream or downstream, referenced to the location in the circuit being monitored by the instrument. The results of the sag directivity analysis shall be included in the event database for display to the user on the instruments user interface.
5.1.2. Power factor correction capacitor switching detection. This algorithm shall analyze all voltage transients recorded by the instrument in real time for the purpose of determining if the source of the transient was a power factor correction capacitor switching into the circuit being monitored. In addition, this algorithm shall determine the source of the power factor correction capacitor switching onto the circuit as being upstream or downstream, referenced to the location in the circuit being monitored by the instrument.
5.2. The instrument shall have a standard motor power quality report. The motor power quality report shall summarize the following parameters at minimum in one page in the instruments user interface:
5.2.1. Voltage, Current, VTHD, ITHD, V Unbalance, True PF, Horsepower, Negative Sequence Components.
5.2.2. In addition, a rating factor shall be computed that represents a summary of the overall motor power quality based upon the measured values of the parameters and shall be displayed simultaneously with the parameters.
6.0 User interface
6.1. The user interface shall include an enunciator panel mode. When the instrument is in the monitor mode the enunciator panel sections will identify the various parameters. When one of the parameters is detected out of tolerance the appropriate section of the enunciator panel shall change from green to red. To view the out of tolerance parameter the user touches the panel and immediately views the data without stopping monitoring or downloading any data to a separate PC.
6.2. The user interface for setup modes shall include preconfigured modes for Power Quality, current in rush testing, fault recording, EN50160 and long term monitoring. These preconfigured modes shall be easily changed from the instrument screen.
6.3. Built in graphic display assistance. All set up parameters shall include a build in graphic display to assist the user in setting up thresholds, trigger methods, and wiring configuration.
7.0 Physical Characteristics
7.1. The analyzer should be portable and weigh less than 4 pounds. It shall be totally self contained and be able to perform all analysis functions without the use of any external devices other than circuit connective devices such as current transformers and voltage probes. The device shall measure no larger than 12" W x 2.5" H x 8" D.
7.2. The analyzer shall be ruggedly constructed for use in harsh industrial and commercial environments and to minimize damage during in-house or remote shipments. The analyzer shall also include a protective rubber “boot” to provide additional protection as standard. The analyzer shall have available as an optional, custom designed soft carrying case as well as a rugged shipping container.
7.3. The analyzer shall have a built-in color touch screen display used to display: menus, AC waveforms (real time and recorded), and time plot of monitored parameters.
7.4. The battery shall be capable of easy removal and replacement in the field. The battery shall be capable of being recharged by the AC power adapter while the unit is in use or turned off. Recharge time shall not exceed 3 hours, if the analyzer is off.
8.0 Accessories
8.1. The handheld analyzer shall have an optional accessory, which will allow for undisturbed, long-term and secured operation in harsh environments. This accessory shall be a NEMA 4X rated enclosure and include all internal voltage and current connectors as well as weatherproof voltage cables for connection to the circuit under test. Optional weatherproof current interface cables shall also be available.
9.0 PC Analysis and Report Writer Software
9.1. The analyzer shall have an optionally available PC software application package available for off-line analysis and report generation. The program must be compatible with XP, Vista, 7, 8. The program shall allow for simultaneous viewing of historical timeplot data and waveforms in a dual pane format to aid in analysis. Multiple zoom capability of any parameter shall also be featured.
9.2. The PC analysis software shall also have a seamlessly integrated Report Writer package for complete unattended and automatic report generation.
9.3. The software shall be able to correct reverse probe connection, wrong timestamp and scale factors.
9.4. All events should be shown in the event list with event type and timestamp.
9.5. Via software the device settings should be configured from the remote and transferred to the storage medium in instruments.
10.0 Agency Certifications
10.1. The analyzer shall be UL and CE certified.
11.0 Documentation, Warranty and Support
11.1. The manufacturer shall supply a User’s Guide for each instrument which provides general operating instructions, connections diagrams for common single-and three-phase power system configurations and instrument specifications.
11.2. The instrument shall include a 3 year warranty. The manufacturer shall also maintain a staff to assist users and operators of the instrument, via telephone, in the maintenance, use and operation of the instrument and to assist with interpretation of recorded events.
July 2013
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