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Power MeasurementMeasurements on Transformers
The general opinion that low-loss transformers are not a current topic in times of current regulation and thus reasonable energy costs has to be qualified. Low-loss transformers also contribute to the achievement of the Kyoto-objectives as regards the reduction of greenhouse gas emission. The power measurement of transformers, especially the identification of power loss, must be very precise indeed. Precise measurement at a phase angle of 90°, that is mere reactive power, is one of the most important premises.
Task
When we talk about transformers we think of the precise identification of losses, short-circuits and idling losses. This means that we need a high accuracy for U, I and P at 50/60 Hz and in small power factors.
Solution
Hardware
Based on the new DEWE-PM-series it is quite easy to define the adequate hardware solution. With up to 16 input channels several power modules can be used in order to e.g. measure 3-phase input and output lines at the same time. With the help of the high number of channels (basic instrument with 16 channels, upgrade rack with another 16 channels) also multi-coil transformers can be identified during one measurement cycle. Additionally, temperature and acoustic/noise level can be measured.
Software
The option power for DEWESoft is a high-performance tool for the calculation of power and other related parameters. The accuracy of the calculated values is achieved by the calibration in the frequency range and the special calibration of the angle error. Using this unique technology, amplitude and phasing in the frequency range can be corrected. All internal correction curves are considered by this software and the sensor data base includes all corrections for current-, voltage converter or any sensor used. A correction of power measurement is also possible according to IEC 60076-1.
Some Details
Various Power Modules
With the DEWESoft power module an arbitrary number of power lines can be measured simultaneously. e.g. transformer: Uprim / Usek / Ueb / U
FFT– Harmonics Analysis
- U, ULine, I, P, cos and Q
- Individual setup of the number of harmonics including DC (example: sampling rate 20 kHz = max. 200 harmonics @ 50 Hz)
- Values adjusted to the actual power frequency
Vector Diagram
The „transparency function“ makes the direct optical comparison of phases possible (e.g. input and output of a transformer). Moreover, the values can be calculated analytically with the help of mathematical functions.
Plugin-OPC
With the OPC-Plugin for DEWESoft the integration in the control technology can be carried out and automated test benches can be put into practice. OPC is a standardized protocol for data transfer from several measurement instruments (OPC server) to one central computer (OPC client).
Acoustic/Noise Level Measurement
Accurate and high-resolution noise level measurements following IEC 60651, 60804, 61672. DEWESoft and its user-friendly interface convince and bring the sophisticated noise-/acoustic analysis to the customer.
Customers
- All producers of transformers (ranging from power transformers to distribution transformers)
- Companies responsible for maintenance and energy supply companies
- Energy supply companies
Please check out our pre-configured standard models for power measurement. Standard models meet approximately 80 % of all application requirements, are cost optimized and shipped faster.
Technologie AG