Asset management techniques for transformers (original) (raw)
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Asset Management Through Effective Transformer Diagnostic & Condition Monitoring
Power transformers are the most critical and important equipment in the power sector. It links power generation, transmission and distribution. There is a huge investment required to acquire or replace them and when they fail, huge losses are incurred in terms of assets, revenue and customer good will. This huge financial burden due to sudden losses of power transformers can be minimized through effective condition monitoring and diagnostics. This paper presents a computer program developed to interpret the condition of power transformers by the analyzing the dissolved gases. The computer program developed using C-Sharp (C#) language under WINDOWS operating system is used to assess four different methods of Dissolved Gas Analysis (DGA) technique to predict the condition of the transformer so as to improve the accuracy of the interpretation. The result shows an increase in the faultanalysis classification of these DGA methods by up to 20%.
CONDITION MONITORING APPROACHES OF A TRANSFORMER
Journal of Electrical Engineering, 2017
–Equipments are deteriorating with respect to time. If the timing and causes of the equipment deterioration are known ,proper preventive measures can be taken and hence the life time of the equipment can be increased. In this context, several parameters can be analysed, e.g-pressure ,temperature, vibration ,flow etc by collecting data and following certain methodologies to indicate the status of condition of the equipment. In this way the reliability of the equipment can remain high and longevity also can be increased. This paper presents a survey on various condition monitoring approaches of transformer along with various practical case studies based on various site visits. It discusses the minute details about how the condition of a transformer can be assessed after several years of usage and operation. It also discusses what are the methodologies used for assessment of transformer's condition and necessary precautions to be taken to avoid errors in assessment of condition. Some practical case studies based on various site visits are also shown to emphasize the importance of the work.
An overview on power transformer management: Individual Assets and Fleets
2012 Sixth IEEE/PES Transmission and Distribution: Latin America Conference and Exposition (T&D-LA), 2012
A Power Transformer is an efficient and reliable machine that is designed and built to ensure a long useful life under normal operation. However, among the total number of operative power transformers installed in networks around the world, there are many aged units, which are approaching to the state of final failure. This situation of simultaneous aging becomes a major problem, and its proper solution is critical for the electric utilities because their financial performance and economic viability are unavoidably dependent on the reliability of this equipment. In this regard, this paper presents an overview on the optimal management of a power transformer fleet. The review is focused on a methodological scheme oriented to the assessment of the transformer risk index and its two main components: the probability of failure index and the post-failure consequence index.
Condition Monitoring Techniques of Power Transformers: A Review
2015
Power transformers provide a vital link between the generation and distribution of produced energy. Such static equipment is subjected to abuse during operation in generation and distribution stations and leads to catastrophic failures. This paper reviewed the techniques in the field of condition monitoring of power transformers in recent years. Transformer monitoring and diagnosis are the effective techniques for preventing the eventual failures and contributing to ensure the plan’s reliability. This paper provided a survey on the existing techniques for monitoring, diagnosis, condition evaluation, maintenance, life assessment and possibility of extending the life of the existing assets of power transformers with be appropriate classifications. Thus, this survey could help researchers through providing better techniques for condition monitoring of power transformers.
11.Methods to Determine the Overall Health and Condition of Large Power Transformers
The unsteady implementation of the conceptual model of deregulation of electric utility industry in many countries has caused significant consequences in the overall health of the general population of large power transformers [LPTs]. LPTs are now subject to adverse conditions due to advanced aging, decreases in routine testing and maintenance activities, reduction of capital for repair and replacement, increased loading and lack of technical expertise. The method presented in this paper provides a blueprint to successfully determine the overall health and condition of LPTs.
Methods to Determine the Overall Health and Condition of Large Power Transformers
The unsteady implementation of the conceptual model of deregulation of electric utility industry in many countries has caused significant consequences in the overall health of the general population of large power transformers [LPTs]. LPTs are now subject to adverse conditions due to advanced aging, decreases in routine testing and maintenance activities, reduction of capital for repair and replacement, increased loading and lack of technical expertise. The method presented in this paper provides a blueprint to successfully determine the overall health and condition of LPTs.
Power transformers are the most expensive and perhaps the most strategic assets in a substation. Accordingly, transformer operators both in the utilities and in industry are drawn to optimize their overall financial performance by maintaining a high reliability and extending lifetime at minimal costs. One obvious requirement for this performance improvement is knowledge about the current condition of the whole transformer fleet. This information is essential for the short-term, long-term, and strategic decisions of the transformer operator. In most companies, different funding sources (and departments) are responsible for the optimal fleet management: capital expenditures (CAPEX), operating expenditures (OPEX) and the grid operator.
IJERT-Condition Monitoring of Power Transformer: A Practical Approach
International Journal of Engineering Research and Technology (IJERT), 2021
https://www.ijert.org/condition-monitoring-of-power-transformer-a-practical-approach https://www.ijert.org/research/condition-monitoring-of-power-transformer-a-practical-approach-IJERTV10IS050172.pdf Power transformer is important and expensive component in the electric power system. At electricity utilities still maintenance approach is time and age based only. This paper describes how various observed, measured, testing conditions used for calculation of 'health indices' to support reference for asset management programmes to management and asset cares. Power transformers are important assets in electrical network, considering cost and reliability. The conditions of these assets have to be known, in order to avoid any possible outages and to choose the appropriate maintenance operation that could be done. The health index of a power transformer is one single overall indicator that represents its condition and is derived by a weighting process of all available indicators. This paper presents a case study on several power transformers having different capacity and discussing the benefits of using health index and failure probability as overall diagnostic tools. Moreover, a remaining lifetime calculation based on the transformer failure probability is defined.
The Service Reliability of Aging Power Transformers
Power transformers are aging ahead of time since the insulation system is vulnerable to electrical stress, moisture content, dissolved oxygen and excessive heat. For improving on-line the effectiveness of the existing maintenance techniques this paper suggests two economically rewarding and scientifically sustainable procedures. One is to quantitatively remove the Oxygen dissolved in the oil. A new ASTM Test can prove that this troublemaker is finally gone. Thus, a century old deficiency is solved. Removal of the water adsorbed by the paper insulation of windings is the second. Consequently, the insulation of transmission transformers can be significantly improved. As a result, the internal insulation of windings increases, the dielectric losses goes down, the heat dissipated in the atmosphere diminishes and the service reliability improves. This cost effective and environmentally friendly method was successfully tested in real life conditions and its economic and technical benefits were accurately measured.