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Lightning caused around 26% of the total number of faults in the Portuguese transmission system in the analysed period. Based on historical data, this study uses incident data from 2001 until 2008 (2157 faults in overhead lines) and lightning data from 2003 until 2008 (around 1.65 million cloud-to-ground flashes). The performance of the lightning monitoring system is analysed and the statistical analysis...
Chinese power industry developed rapidly recent years, and the problem of safety and reliability of power equipment is increasingly outstanding. The development of new test technology and the introduction of artificial intelligence (AI) are driving the monitoring and diagnosing method on insulation condition forward, and nowadays gradually changing the maintenance strategy from breakdown maintenance...
Power transformer is one of the most important components in the power system. The operating reliability of transformers mainly depends on their insulation status. An integrated system which contains the monitoring of gas-in-oil analysis (DGA), partial discharge (PD), contamination of the bushing surface, the equivalent capacitance and dissipation factor (tandelta) of the bushing is introduced in...
It is a common trend of power companies to progressively change its equipment maintenance strategies from relying on purely time-based preventive tasks to more condition-based predictive tasks. An important prerequisite of condition based maintenance is condition monitoring. Results of condition monitoring on power equipment form useful information in formulating asset strategies in the most cost...
In the past decade, CLP Power Hong Kong Limited (CLPP) has initiated the application of a series of condition monitoring techniques on its power equipment so as to allow progressive change of its equipment maintenance strategies from time-based preventive tasks to more condition-based predictive tasks. The data collected from the HV GIS, cables and overhead lines form useful information in maximizing...
This paper presents a new technique to perform partial discharge (PD) monitoring on high voltage apparatus that are critical to transmission systems, focusing on high voltage cable systems. The hardware used for PD monitoring is innovative since it can provide information concerning PD pulse waveforms, allowing, in particular, disturbance and noise rejection. The PD system is also endowed with an...
Currently, the evaluation of the aging process of HV assets becomes of high strategic importance, where technical aspects as well as economical and social issues have to be taken into consideration. After a general review of the information strategy applied for reliability-centered maintenance (RCM) the submitted paper deals more in detail with an advanced tool for computer-based PD monitoring of...
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