ALFF ENGINEERING - products - pdc-analyser

<body> <b>PDC-ANALYSER-1MOD<br> <br> </b>For more than 15 years <b> ALFF ENGINEERING</b> has designed and produced electronic measurement equipment to customers order. A lot of experience has been accumulated in the areas diagnoses of high voltage equipment and quality inspection of products used for high voltage apparatus.<br> <br> This homepage is dedicated to the <b>PDC-ANALYSER</b>, a novel, compact equipment for on-site evaluation of the properties of mixed insulation as found in high voltage transformers.   <p> Although the existence of polarisation and depolarisation currents is known for long as well as the related return voltage, it is only now possible to utilize these relaxation currents for a reliable assessment of the insulation quality, namely the humidity of the cellulose board and the conductivity of the oil in a mixed insulation. In such insulation, the properties of oil, the properties of cellulose and the given geometry superpose in shaping the relaxation currents and only careful and profound analyses can differentiate between the effects.  <p> The <b> PDC-ANALYSER</b> with its advanced evaluation software eases this task and non-experts can well use it. The <b>PDC-ANALYSER-1MOD</b> (<b>P</b>olarisation <b>D</b>epolarisation <b>C</b>urrent) is an instrument for on-site measuring and analysing the dielectric behaviour of electrical insulation materials and insulation systems.</p> It combines a windows compatible computer, a wide range electrometer with special filtering properties, an adjustable voltage source, switching devices, measuring and analysis software in one portable, rugged case. It can be used in high-voltage substations as well as laboratory and industrial environments.   <p> <b>FEATURES:</b> </p> <ul> <li> Automatic data acquisition of polarisation and depolarisation currents over duration up to 200'000 s with a sensitivity of <img border="0" src="images/10.gif" width="27" height="11"> A (however, a typical measurement takes between 2'000 and 10'000 s)</li> <li> Adjustable voltage source up to 2'000 volts</li> <li> Measured time domain data can be converted into frequency domain data resulting in a continuous dielectric spectroscopy (capacitance and dissipation/loss factor) from 1 Hz down to less than 0.0001 Hz</li> <li> Evaluation of diverse kinds of "polarisation indexes", "return voltages" and "polarisation spectra"</li> <li> Evaluation of the ageing state and of the moisture content of especially oil-paper insulation systems</li> <li> Ongoing measurements can be viewed real-time on large color screen</li> </ul> <b><br> APPLICATIONS:</b> <ul> <li> Non-destructive diagnosis of electrical insulation systems: all kinds of power transformers, bushings, power cables of any design, generators, motors</li> <li> Material testing</li> <li> Production control</li> <li> Documentation of insulation properties of new high voltage equipment for anticipated comparison purposes. This can be helpful for making maintenance and end of life decisions</li> </ul> <b><br> INSULATION:<br> </b>All kinds of insulation materials undergo degradation processes or ageing effects, if stressed by electric fields, partial discharges, temperature and mechanical forces. These ageing effects change the dielectric properties (real and imaginary part of the permittivity) which can bi identified either by the measurement of the "dielectric response function" in the time domain (also called "time domain spectroscopy") or by measurements of the capacitance and the losses in the frequency domain ("frequency domain spectroscopy"). Application of these methods to insulation systems of high-voltage equipment is extremely valuable as the results provide answers about the actual conditions and the status of the insulation.   <p> As the results from each measurement method can be transformed mathematically into equivalent results of the other method, the <b>PDC-ANALYSER-1MOD</b> is based on "time domain spectroscopy", which can be made in less time and with better precision than measurements in the very low frequency domain. </p> <p> The <b>PDC-ANALYSER-1MOD</b> is thus a most flexible diagnostic tool for insulation systems and insulation materials.</p> <p> <a href="http://www.alff-engineering.ch/seiten/s_downloads.htm"> <br> </a><b>ADDRESS:</b><br> <table border="0" width="100%" cellspacing="0" cellpadding="0"> <tr> <td width="50%">ALFF ENGINEERING<br ALFF> Dr. sc. techn. Jean-Jacques Alff<br> Gomweg 7<br> CH- 8915 Hausen am Albis<br> Switzerland<br>   <br> <table border="0" width="100%" cellspacing="0" cellpadding="0"> <tr> <td width="20%">phone:</td> <td width="80%">+41 1 77 66 77 6</td> </tr> <tr> <td width="20%">fax:</td> <td width="80%">+41 1 77 66 77 7</td> </tr> <tr> <td width="20%">e-mail:</td> <td width="80%">info@alff-engineering.ch</td> </tr> <tr> <td width="20%">website:<br>   </td> <td width="80%"><a href="http://www.alff-engineering.ch">www.alff-engineering.ch</a><br>   </td> </tr> </table> </td> <td width="50%" valign="top">For technical and sales information:<br> <br> Dr. V. Der Honhanession<br> phone:    +41 1 751 04 70<br> e-mail:    <a href="mailto:vahedh@swissonline.ch">vahedh@swissonline.ch</a> <p><br> </td> </tr> </table>   <p>design by <a href="http://www.cvb.ch">cvb.ch</a></p> </body>