An increasing problem of ageing cable insulation requires a development of certain methods for online conditioning and offline assessment. Thus, Partial Discharge (PD) monitoring is the most effective technique for assessment of insulation condition. PD monitoring and analysis has become imperative for utilities as well as for equipment manufacturers as it causes deterioration of insulation sys...

Partial Discharge monitoring provides a tool for the assessment of failure risk for high voltage plant and equipment. The measurement process is complicated by the presence of interference, transients and other sources of disturbance on the system. In practical monitoring systems these disturbances almost certainly fall outside the boundaries of any expert system for PD recognition. Because of ...

Partial discharge (PD) measurement and recognition is a significant tool for potential failure diagnosis of the high-voltage equipment. This paper proposes the application of grey clustering approach (GCA) to recognize partial discharge patterns of the high-voltage equipment. The PD patterns are measured by using a commercial PD detector. A set of features, used as operators, for each PD patter...

The calibration of a partial discharge measuring system is carried out to determine its scale factor. This operation is performed in the complete test circuit by injecting across the terminals of the device under test a known charge generated by a traceable calibrator. The paper presents the calibration of four different partial discharge measuring systems, carried out by using a programmable r...

This paper described the measurement of acoustic signal generated by partial discharge in insulation oil and analysis of their frequency spectrum to acquire information for diagnosing oil insulated transformers. We designed a decoupler and a low-noise amplifier to detect acoustic signals with high sensitivity. Also, three types of electrode system; the needle-plane, the plane-plane, the wire-wi...

This paper describes the development of a partial discharge measurement system that utilises a multiplexed approach to ultra-high-frequency monitoring on many pieces of equipment using a single cable loop connected to only two sampling channels. It is envisioned that the system could be used in partial discharge monitoring of medium voltage metal-enclosed switchgear, or several power transforme...

AlNxOy thin films were produced by DC reactive magnetron sputtering, using an atmosphere of argon and a reactive gas mixture of nitrogen and oxygen, for a wide range of partial pressures of reactive gas. During the deposition, the discharge current was kept constant and the discharge parameters were monitored. The deposition rate, chemical composition, morphology, structure and electrical resis...

Partial discharge (PD) detection is an important means in the condition-based maintenance of high voltage apparatus including crosslinked polyethylene (XLPE) power cables. In this contribution, we introduce the recent work in Shanghai municipal electric power company on the condition-based maintenance of XLPE power cables. As to how to carry out the PD detection in different circumstances, thre...

The ability to accurately monitor the health of power distribution plant is a very attractive prospect for utility companies. This capability would provide a system that engineers could use to assess the real-time state of the network. Analysis of the data produced could allow for more informed decisions to be made in the areas of asset replacement and maintenance scheduling amongst others. It ...

In the above article [1] , original title “Partial Discharge Investigation of Form-Wound Electric Machine Winding for Aircraft Propulsion” is wrong and should be “Partial-Discharge-Free Insulation Design Air-Core Permanent Magnet Synchronous Propulsion.”