发明名称 |
MEASURING SYSTEM FOR PARTIAL DISCHARGES |
摘要 |
The present invention relates to a method and a device for detecting partial discharges in cables and accessories, comprising the following steps of: interrupting the metal earth shield of the cable; connecting both sides of the interrupted sheath to a measuring instrument; arranging a connection between both sides of the interrupted sheath which is at least suitable for transferring the signals with the mains frequency; and displaying the signal, wherein only signal components with frequencies greater than 0.5 MHz are displayed. As a result of these steps, the interference associated with the first mentioned frequency range is avoided. It is noted here that the signal/noise ratio of the frequency range applied according to the invention is more favourable. In order to properly be able to examine the quality of a partial discharge, it is important to relate it to the voltage of the cable in which the partial discharge takes place. The present invention provides a method wherein prior to display the signal is combined with a signal representing the mains voltage. It is especially attractive when the signal representing the mains voltage is generated in contact-free manner, for example in capacitive manner.
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申请公布号 |
CA2174606(A1) |
申请公布日期 |
1996.10.22 |
申请号 |
CA19962174606 |
申请日期 |
1996.04.19 |
申请人 |
N.V. KEMA |
发明人 |
STEENNIS, EVERT FREDERICK;PULTRUM, EDWIN;WOUTERS, PETRUS ARNOLDUS ANTONIUS FRANCISCA;VAN HEESCH, EGBERTUS JOHANNES MARIA |
分类号 |
G01R31/12;(IPC1-7):G01R31/02;G01R15/16 |
主分类号 |
G01R31/12 |
代理机构 |
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主权项 |
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