21 Sep 2018

Yokogawa launches WT5000 precision power analyzer

Power analysis and measurement is growing in importance as all aspects of power consumption of electrical and electronic items come under the microscope.

With drives for efficiency arising from the need for general performance improvements along with the legislation and move towards more eco-friendly usage of power, the need has never been greater for power analysis.

Now engineers need to be able to measure and analyse a huge number of aspects of power and energy usage. This means that the need for advanced power analyzers has risen. To meet this need, Yokogawa has introduced its WT5000 precision power analyzer.

The new Yokogawa WT5000 is a precision power analyzer that offers measurement accuracy of ± 0.03% combined with stability, noise immunity and plug-in modular flexibility to meet the measurement needs of today’s developers of energy-efficient systems. The WT5000 is also capable of measuring a wide variety of power parameters. Everything from basic power to harmonic content, phase, and all the measurements can be made and downloaded concurrently, or stored for later analysis on of off the WT5000.

The Yokogawa WT5000 provides a versatile platform, that can be configured with the modules that are needed for the measurements envisaged and updated at a later date if required. In this way investment usage is maximised and it is available for the long term rather than falling out of date.

The WT5000 achieves an accuracy level of ±0.03% of total at 50/60 Hz. As a result, it has become possible to evaluate the power consumption, loss, and efficiency of electrical and electronic devices. In particular, its wide dynamic current range is indispensable for tests on energy-saving designs.

One of the essential elements for determining the performance of a power measuring instrument is the A/D converter that performs analogue-to-digital conversion. In order to obtain the accuracy needed, the Yokogawa WT5000 uses an 18-bit converter with a sampling frequency of maximum 10 MS/s. As a result, it becomes possible to accurately capture waveforms from the latest high-speed inverter devices. It is very effective for stable measurement results.

While the WT5000 has the same dimensions as existing models in Yokogawa’s WT series, it incorporates up to seven input channels, allowing it to support applications that previously could only have been measured by synchronising several separate instruments. As a result, it offers considerable savings in installation space, communications overheads and cost-effectiveness. Further benefits result from the use of plug-in modular input elements, which can be swapped directly by the user.

The 30 A and 5 A elements, for example, can be switched for applications involving electric vehicles or fuel-cell vehicles, where developers are increasingly required to evaluate a number of different motors. Using the WT5000 equipped with the /MTR1 and /MTR2 options, it is possible to evaluate up to four motors simultaneously with one unit. Since these options allow the input of four channels, flexible measurement of the A, B, C and Z phases of each motor can be carried out.

With a 7 elements input capability, multi-system measurement is increased in harmonic measurements on 3-phase systems, for example. The WT5000 can carry out two harmonic measurement functions simultaneously, each at up the 500th order and up to 300kHz fundamental waveform. This makes it possible to measure the carrier frequency component from the rotational speed of the motor in the inverter drive and also to check the influence of the carrier frequency on the motor drive.

An increasing number of applications require the evaluation of larger-current devices, typical examples being electric vehicles and large-scale solar installations. In these cases, external current sensors are often used. An external current sensor input function is fitted as standard in the input element of both the 30 A and 5 A input elements of the WT5000. For much higher currents (up to 2000 A RMS) dedicated high-current sensors are available. Yokogawa AC/DC current sensor CT series is current output type in order to prevent noise influence.

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