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Wind power has developed quickly in recent decades. The reliability of wind farms is strongly determined by the insulation conditions of all the assets in the power production and distribution system, which contains the wind turbines, power cables and accessories, switchgears, transformers, etc. The online partial discharge test has been proven to be an effective diagnostic approach to evaluate the...
In the lab, partial discharge diagnosis has widely replaced the traditional RIV measurements. Additionally, partial discharge acceptance levels are being reduced due to the increasing use of composite material and a growing awareness of partial discharge phenomenon and their consequences. Adequate filtering of the supply voltage for induced voltage testing and the use of sensitive acoustic measurement...
Integrator leakage is a dominant factor in the SNR (signal-to-noise ratio) loss of DeltaSigma modulators. In this paper, we propose a design-for-test (DfT) technique to diagnose the integrator leakage of the single-bit first-order DeltaSigma modulator. The proposed technique is a low-cost solution; it only adds two multiplexers to the modulator, utilizes a single DC voltage as the test stimulus, and...
For advanced, non-destructive on-site condition monitoring of HV power cables up to 150 kV by partial discharge detection and dielectric losses measurement it is necessary to energize the disconnected cable system. One of the methods available for this purpose is based on applying damped AC voltages up to 150 kV. In this contribution, the use of modern technological solutions in power electronics...
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