FEATURE POWER ELECTROTONICS
Power analyser helps optimise efficiency guarantees
A Yokogawa power analyser was used by power a transformer manufacturer to optimise efficiency guarantees, here’s more on the application results
Figure 1:
S.E.A. has chosen to entrust crucial transformer power measurements to the WT5000 Precision Power Analyser from Yokogawa
T
ransformers play a crucial role in the transmission and distribution of
electrical energy; they precisely regulate the voltage of the electricity supply as it is transmitted from power stations to homes, offices, factories and high power consumers, such as railways. There is always some power loss when one voltage level is changed to another. In a transformer operating at transmission- network voltages of tens of thousands of volts, the loss of even a fraction of 1% of the converted power can result in losses of many thousands of Watthours of energy every year. A primary requirement is therefore to
make a transformer as efficient as possible to reduce both the financial loss and the emissions of greenhouse gases, and other pollutants, when generating the extra energy required to make up for the power lost in transmission. Italian manufacturer of power
transformer and reactors,Società Elettromeccanica Arzignanese (S.E.A.) has a worldwide reputation for engineering excellence and high production quality. S.E.A. supplies high-value assets which are expected to provide a return over decades. Quality, durability, safety and reliable performance are therefore key characteristics that customers are looking for when they specify a new transformer or reactor. The efficiency of a transformer, needs
to be carefully verified before shipment to the customer; the terms and conditions of the sale of a transformer typically specify financial penalties running to tens of thousands of Euros if it fails to operate as efficiently as specified by the manufacturer.
28 JULY/AUGUST 2020 | ELECTRONICS The measurement of a transformer’s
efficiency, according to the IEC60076-1 industry standard, requires an instrument capable of measuring voltage, current, phase and power (W) over a range of power factors from 1 down to 0.01. S.E.A. entrusts these critical transformer
power measurements to the Yokogawa WT5000, a precision power analyser, which offers an AC power measurement accuracy of ±0.03% at 50/60Hz and provides performance guarantees from 1% to 130% of the selected voltage and current ranges. High accuracy
measurements at very low power factors particularly requires a power analyser to possess very low uncertainty for its internal phase shift. This along with all other influences are fully specified for the WT5000, which makes it ideal for the measurement of transformer losses under no-load conditions. Renato Franco, testing manager at
Figure 2:
The WT5000 enables S.E.A. to build a record of delivering transformers that meet customers' minimum efficiency specifications
S.E.A. says: “When buying an instrument intended for use over a period of many years, measurement stability is as important as accuracy.” Continuing he says: “Evidence from accredited calibration shows that the instrument not only provides us with the accuracy we need, but also maintains its performance over many years of use – this is a very important reason for us to choose the WT5000.” S.E.A.’s customers therefore benefit
from the highest possible specified operating efficiency, which in turn gives the manufacturer a competitive edge in the market, since claimed efficiency is one of the most important factors affecting the transformer buyer’s choice of product. Renato Franco of SEA concludes: “For
us, it is vital to deliver a product that matches its high design specifications. By using the proven accuracy and stability of the WT5000 to both specify our transformers and to check their individual performance, we are confident that our customers are really getting what they are paying for.” The guaranteed accuracy and precision
“The efficiency of a transformer needs to be carefully verified before shipment to the end customer. The terms and conditions of the sale typically specify
financial penalties if it fails to operate as efficiently as specified”
of Yokogawa's instruments results from the fact the company has its own European standards laboratory at its European headquarters in The Netherlands. This facility is the only industrial (i.e. non-government or national) organisation in the world to offer accredited power calibration, at frequencies up to 100kHz. ISO 17025 accreditation demonstrates the international competence of the laboratory.
Yokogawa
www.yokogawa.com
/ ELECTRONICS
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