Yokogawa launches world's most accurate power analyser dedicated to transformer testing

With an accuracy of 0.5% at power factors as low as 0.01 at 100 V and 1 A, the WT3000E Transformer Version is ideally suited to the precision testing of transformer losses, allowing transformer manufacturers to avoid potential fines imposed by power authorities that could run into thousands of euros.

The WT3000E Transformer Version maintains high levels of accuracy over a wide range of power factors. The ±0.01% total power accuracy figure applies at a power factor of 1 and a frequency of 44-66 Hz. The corresponding value for power factors in the range 0.02 to 0.01 is 0.5%, and for power factors in the range 0.01 to 0.001 it is 7%.

Not only is the WT3000E Transformer Version the world's most accurate power analyser: it is also a highly stable instrument that offers consistent results time and time again without the need for yearly adjustments. Every instrument is supplied with a calibration certificate from Yokogawa's ISO 17025 accredited calibration laboratory in the Netherlands. As the only ISO 17025 certified non-governmental organisation that offers calibration up to 100 kHz, Yokogawa is uniquely equipped to guarantee the specifications of its power meters and improve them with calibration.

The WT3000E Transformer Version features measurement ranges that are optimised to match the potential and current parameter values used in the transformer industry. It also enables users to measure harmonics and distortions while simultaneously measuring power. It can analyse and display a waveform's individual frequency components, as well as checking signal components other than the integer multiples of the fundamental wave. 

User-defined triggers can be set to capture readings that satisfy or fall outside user-defined conditions. Users can also define and use up to 20 custom computations.

Delta computation, provided as a standard function, allows calculation of individual phase voltages from line voltages measured in a 3-phase/3-wire system. Another standard feature is cycle-by-cycle trend analysis, which allows users to list voltage, current, active power and other parameters for each cycle. Direction sensitive energy measurements are also enabled, with the facility for the integration of instantaneous values for positive and negative readings.

The instrument is supplied with free application software which is used to read numeric, waveform, and harmonic data through a communications interface such as GP-IB, USB or Ethernet.