Feature sponsored by Test & measurement
accurate measurement of power parameters. The measurement equipment must offer high common-mode noise rejection, as the output voltages of the inverters display high dV/dt, giving rise to spectral components at very high frequencies.
MEASUREMENT SOLUTIUON KEB has procured the WT5000, the latest model in Yokogawa’s family of Precision Power Analysers, for use in the development and validation of frequency converters and other products. KEB is a long-time user of Yokogawa power analyser products. It performed rigorous comparisons of the WT5000 with earlier power analysers: its analysis showed that the average currents attributable to common- mode noise were at an extremely low level, and lower than in its previous test instrument, the Yokogawa WT1800. In addition, KEB’s tests of the WT5000 found no crosstalk from channels affected by common-mode noise to other channels, even when operating at the system’s full measurement bandwidth of 5 MHz for current and 10 MHz for voltage.
THE RESULT
converters requires detailed analysis of the circuit’s voltage and current waveforms and instantaneous values. This enables the developers to measure power losses accurately, and so to refine the circuit to improve overall efficiency. This calls for test instrumentation which rejects the high levels of common-mode noise generated by the IGBT power switches in KEB’s frequency converters.
APPLICATION REQUIREMENTS KEB uses a power analyser throughout the development phase of a new frequency converter design. After completion of a final production design, the power analyser is also used to validate the product’s performance specifications, and to verify the characteristics of production units.
The development of frequency converters used in variablespeed drives requires precise,
Instrumentation Monthly February 2023
As the world’s most accurate precision power analyser, the WT5000 offers the performance required by KEB’s development team. KEB uses the WT5000 to measure power losses in frequency converters and to validate their operation. The WT5000’s power measurements are accurate to 0.01 per cent (reading) and 0.02 per cent (range) at AC mains frequency (50/60 Hz). The instrument is able to handle KEB’s demanding test requirements, whether for high-frequency operation – the WT5000 has measurement bandwidth of 5 MHz and maintains 18-bit resolution at a sampling rate up to 10 MS/s – or for complex test set-ups. The instrument has a modular architecture, in which the user can simultaneously measure and view seven swappable input elements, which slot into the rear of the frame. The flexibility to reconfigure the test set-up is particularly valuable to KEB’s development teams, which continually switch from one project to another in support of KEB’s broad portfolio of products. KEB’s David Kater says: “I really like the modular design of the channels on the WT5000. KEB has used the seventh channel, for example, to measure auxiliary power supplies or the DC link while the first six are measuring the main motor or converter circuits. The WT5000 also helps make engineers more productive with features such as immediate recognition of the module configuration after switching on, followed by automatic initialisation of the channels.” KEB’s engineers also favour the instrument’s intuitive navigation and touchscreen operation, which reduce the time it takes to configure and run a test.
WT5000 PRECISION POWER METER Featuring high isolation and high noise immunity, accurate current sensing and precise filtering in a modular architecture, the WT5000 is an extensible measurement platform which performs precision power analysis to aid the development of energy- efficient systems.
Key benefits of the WT5000 include:
Reliability – with a guaranteed accuracy of ±0.03 per cent, harmonic comparisons up to the 500th order, and custom computations, the WT5000 produces multi-channel measurements which the user can trust.
Versatility – featuring seven slots for user- swappable input elements, diverse mainframe options, and simultaneous evaluation of up to four motors, the WT5000 enables the user to expand or reconfigure the instrument as applications and needs change. Raw data can also be streamed to a PC for detailed analysis.
Flexibility – the WT5000 provides a full touchscreen experience, supported by hardware hotkeys and powerful software for remote measurements, so connecting, configuring and measuring power has never been easier.
“The WT5000’s extremely high immunity to common-mode noise and the high channel- to-channel isolation indicate to me that I can safely rely on the instrument when analysing the voltages and currents which are switched by semiconductor power components,” concludes Kater.
Yokogawa Test & Measurement
tmi.yokogawa.com/eu/
43
Page 1 |
Page 2 |
Page 3 |
Page 4 |
Page 5 |
Page 6 |
Page 7 |
Page 8 |
Page 9 |
Page 10 |
Page 11 |
Page 12 |
Page 13 |
Page 14 |
Page 15 |
Page 16 |
Page 17 |
Page 18 |
Page 19 |
Page 20 |
Page 21 |
Page 22 |
Page 23 |
Page 24 |
Page 25 |
Page 26 |
Page 27 |
Page 28 |
Page 29 |
Page 30 |
Page 31 |
Page 32 |
Page 33 |
Page 34 |
Page 35 |
Page 36 |
Page 37 |
Page 38 |
Page 39 |
Page 40 |
Page 41 |
Page 42 |
Page 43 |
Page 44 |
Page 45 |
Page 46 |
Page 47 |
Page 48 |
Page 49 |
Page 50 |
Page 51 |
Page 52 |
Page 53 |
Page 54 |
Page 55 |
Page 56 |
Page 57 |
Page 58 |
Page 59 |
Page 60 |
Page 61 |
Page 62 |
Page 63 |
Page 64 |
Page 65 |
Page 66 |
Page 67 |
Page 68 |
Page 69 |
Page 70 |
Page 71 |
Page 72 |
Page 73 |
Page 74 |
Page 75 |
Page 76 |
Page 77 |
Page 78 |
Page 79 |
Page 80 |
Page 81 |
Page 82
