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The technique for rapid assessment of the status of oil-filled transformers, based on the use of statistical procedure for the identification of faults and database long-term measurements of concentrations of dissolved gases in oil, it is proposed. The technique allows to reliably and quickly detecting faults in oil-filled transformers at an early stage of development that ensures timely preventive...
Condition monitoring plays a vital role in any asset management plan. Dissolved gas analysis is a routine test carried out on power transformers to monitor their condition. Four power transformers selected from a repository of power transformers due to their dissolved gas levels exceeding the normal levels are analyzed using the Key Gas Method, the Roger's Ratio Method and the Duval Triangle Method...
Study on method of condition assessment of substation equipment is the key subject in condition maintenance. This article introduced the application of artificial intelligence methods in the substation equipment condition assessment and different artificial intelligence methods, such as artificial neural network (ANN), fuzzy theory and expert system, are introduced respectively, and their advantages...
This paper has summarized the history of the development of the state monitoring system of the power transformer and introduced the present situation in research, especially the multifold comparison on different methods to diagnose the trouble in transformer. This paper not only takes the comprehensive analysis on the extant online monitoring equipments, which is based on DGA, and methods of trouble...
Fault diagnosis of transformer in power system is studied in this paper. Considering the excellent performances of Random Forest (RF) in pattern recognition, we apply RF to construct a diagnosis model to predict the situation of transformer. The experiments of fault diagnosis for some real transformers show that RF obtains a better result in prediction accuracy and stability than traditional Back...
As we known, to evaluate and diagnosis the insulation faults of large-size power transformers, partial discharges (PDs) can be detected via ultra high frequency (UHF) technique. In this paper, an UHF PD online monitoring system was developed for large-size step-up transformers. The principle of UHF PD monitoring method was introduced., and the hardware structure and software key techniques in the...
Transformer in a substation fails due to ageing and/or incipient faults. Many diagnostic methods have been developed based on chemical and electrical techniques. However, most of these methods require specialist knowledge for accurate interpretation of measurement data before reaching any diagnostic conclusions. This paper outlines the key issues involved in power transformer monitoring and diagnosis...
Sophisticated monitoring technologies have emerged to provide technical and analytical support to the condition assessment and diagnosis of high voltage electrical apparatus. As these technologies are being improved, on-line monitoring systems have a special role to prevent failure of major components of the electrical system. The behavior of evolving gases and their critical values have been published...
Transformers are a critical part of an electrical utility's asset base. Loss of a transformer in a utility, generation plant or process can cost many millions of dollars, depending on how long it is out-of-service. On-line monitoring and diagnostics is a useful tool to help operators to manage their assets and make decisions on continuing operation, maintenance or replacement. This paper illustrates...
Transformers play a significant role in power systems. The traditional method of transformer maintenance is time based or off-line-based, which is inefficient and costly. This paper MAS technique was introduced into synthetic fault diagnostic system for power Transformer. Where each agent served as an intelligent knowledge body or intelligent disposal method thus the diagnostic result was deduced...
With the expansion of electric capacity and large-scale extension of power grid, electric equipment is playing a significant role in modern life. At present, the technology of condition monitoring and fault diagnosing of power transformer has been made some improvement, yet its real-time performance and reliability still can't meet the requirement of safe production. Due to different thermal effects...
Power transformers play a fundamental role in electrical power systems, in addition to representing significant investments involved in the implementation of these systems. To reduce the costs associated with a transformer's life cycle and to guarantee its reliability and durability, it is essential to monitor its operating conditions, its insulation system, and the working conditions of its accessories...
Dissolved gas analysis (DGA) is a certain method to diagnose incipient fault of transformers through the correlation between the content of gases dissolved in transformer oil and a particular malfunction. This paper developed an on-line monitoring system to detect the concentrations of H2 and CO dissolved in transformer oil. The system mounts polyperfluoro ethylene-propylene membrane, electrochemical...
This paper is concerned with the design and development of an on-line condition monitoring system for large power transformers utilizing signals such as transformer vibration, voltages, currents, temperature and state of switches. The system consists of two parts which communicate each other via Ethernet or series port. The formal is a front-end computer subsystem used for data acquisition and processing,...
In order to take any proper maintenance actions the transformers conditions should be acquired. Since the transformer performance is limited by its main insulation condition, we focus on the thermal monitoring. As the transformer failure statistic rises, the root cause and ways to solve the problem should be found. Based on failure modes and effect analysis overloaded, external disturbances and ambient...
Power transformers are usually very reliable and durable components of the power supply network. Unfortunately, when a fault occurs in a transformer, it can develop catastrophically and failures are usually very expensive, often resulting in the loss of what is the most expensive plant item in a substation [1]. In order to safeguard this valuable asset, various condition monitoring and diagnostic...
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