September 21, 2018 - Yokogawa Electric Corporation announced that it has developed their next generation of power analyzers that offer measurement accuracy of ±0.03%. The WT5000 combines stability, noise immunity and flexibility to meet the measurement needs of those who develop energy-efficient systems.
Yokogawa developed the WT5000 Precision Power Analyzer to help satisfy evolving application requirements and ever-changing international standards that call for custom measurements and consistent accuracy.
The WT5000 achieves a measuring accuracy: ±0.03% at 50/60 Hz, allowing precision evaluation of power consumption, loss, and efficiency of electrical and electronic devices.
The WT5000 uses an 18-bit converter with a sampling frequency of 10 MS/s. This allows for capture of waveforms from the latest inverter devices while producing a stable measurement.
While the WT5000 has the same dimensions as existing models in Yokogawa’s WT series, it incorporates up to seven input channels, supporting applications that previously would have required synchronization of multiple instruments.
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 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. These options support A, B, Z position signals from encoders as well as analog or pulse type signals from torque meters.
Harmonic measurements for multi-phase systems is \enhanced due to the 7 element input design. Simultaneous dual harmonic analysis can be performed up to the 500th order and up to a 300 kHz fundamental waveform. This enables measurement of the fundamental frequency from the rotational speed of the motor, while also checking the influence of the switching frequency from inverter drive.
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 in order to meet the needs of an increasing number of applications that require the evaluation of larger-current devices, such as electric vehicles and large-scale solar installations. For higher currents (up to 2000A RMS) dedicated high-current sensors are available. Yokogawa AC/DC CT series sensors are current output in order to minimize the influence of noise, the 5A input element is well suited for use with these current sensors.
