Standard for an electrical preventive maintenance epm. Apply an antioxidant compound to all aluminumto copper connections. Asset health management poses a longstanding challenge for power utilities, most of which still operate legacy systems that are difficult to properly and optimally maintain. At the end of 70s, american electric power research institute epri. Analysis of failure statistics and history test record for. The following periodic tests and inspections are recommended for routine maintenance of the medium power substation transformer. Online monitoring technical basis and analysis framework. The solution uses technology by mprest systems ltd. Todays goal begin conversations about eui learn about eui efficiency projects o around the country ron schoff, epri o here in mn lisa severson, minnkota set up discussions for future meetings about policy barriersissues concerning eui efficiency 3. Purpose and scope of the study the office of energy policy and systems analysis epsa, in consultation with the office of electricity delivery and energy reliability oe, of the u. The degree of maintenance and necessary inspection for its operation depends on its.
Epri life cycle management large power transformers. Dielectric frequency response high low high high low low 0,001 0,01 1 100 0,001 0,01 0,1 1 frequency hz tor 0,1 10 ture and e on y oil conductivity. Hence, accurately and efficiently assessing transformer condition is important for asset and risk management. Transformer kva rating nema maximum db ratings 09 40 1050 45 51150 50 150 55 301500 60 501700 62 701 64 decibelsunit for measuring the loudness of sound.
Pdf the pivotal status of power transformer in the power system is one of the. The program is operated in collaboration with the electric power research institutes epris research and development efforts in the longterm operations lto program. Sulfur hexafluoride sf6 management, transformer health and life expectancy management, conditionbased. Pdf a twostage framework for power transformer asset. As an independent, nonprofit organization for public interest energy and environmental research, we focus on electricity generation, delivery, and use in collaboration with the electricity sector, its stakeholders and. Monash university under an electric power research institute epri, usa. Description the project approaches the power transformer as a system. Electric power research institute 2012 research portfolio. Epris integrated grid cost benefit analysis framework. Aging management guideline for commercial nuclear power.
This also requires ranking of equipment for purpose of priortising maintenance. Diagnostic and prognostic models for generator stepup. Gauge readings, ambient temperature, and kva load should be measured and recorded. The transformer must be deenergized before this procedure, unless it. Department of the interior bureau of reclamation technical service center infrastructure services division. C electrical power from one voltage to another voltage keeping the frequency same by electromagnetic induction discover the worlds research 17. Normal maintenance and retrofit of a power transformer not requiring winding replacement or other major step of action is normally performed at site. Power transformer maintenance and application guide 10029. Epri, with support from member utilities, initiated the development and testing of methodologies that use test, maintenance, nameplate, and historical failure performance to assess transformer condition.
Large format irwxpx rectangular windows mean that a single unit can be used for the lv connections and another for the hv connections on a transformer. Power transformers are vital components of the power delivery system and their operation affects a utilitys economic and reliability performance. Check colour of active agent if silicagel is pink, change by new charge. For ideal insulation, the phase angle is 90 degrees, but in practice, no insulation is ideal. Power transformer expert system ptx for condition assessment. The power factor test determines the power loss of the transformers insulation system by measuring the power angle between an applied ac voltage and the resultant current. The transformers inherent ability to step up voltages and currents can create lethal quantities of electricity. Inl has already tested the procedure to install an updated version of the master epri database. Electric motor predictive and preventive maintenance guide. Assessment of large power transformer risk mitigation. Transformer maintenance the text that follows will become chapter 8 of the copper book. Transformer health management alan ettlinger, director. Epri has evaluated various commercially available robots for transformer inspections and identified and labtested promising options, then fieldtested those with utilities. Epris power transformer application and maintenance guide 5, provides a list of the subject transformers in nuclear plants located in the us and canada.
Reliability and vulnerability of transformers for electricity. This report describes research sponsored by epri and the u. Electric power research institute 2012 research portfolio summary of projects. The financial impact of a transformer failure and power. This guide provides information on establishing an effective maintenance program to help prevent unexpected motor failures, costly downtime, and unnecessary maintenance costs. Societys summer 2002 meeting, clark gellings from epri reported the. Cables connected at lv cable box, feedin g the load of the connected power system. The estimation of remaining useful life of transformer winding insulation. Thus, vulnerability assessments, equipment testing, operational procedure enhancements and appropriate measures for grid and facility hardening should be. Pdf development and present situation analysis of power. Towards a new power system, international renewable energy agency irena, 2014. Epri life cycle management large power transformers scribd. The procedure for implementing new prognostic models in fwphm is detailed in expert.
Application of reliability centred maintenance to optimize. Part of the motivation was that the preventive maintenance programmes at many nuclear power plants were based on vendors overly conservative recommendations, without sufficient consideration of actual duty cycles or overall system functions. Unlike motors and generators, transformers are nearly 100% efficient, operate continuously with no maintenance, and have no moving parts. Research institute epri recovery transformer is an example of one. However, when a major repair is required, the failed unit is normally transported to a transformer factory where. Inl and the electric power research institute epri are working jointly to.
Nuclear maintenance applications center 4 winter 2016 instrumentation area and process radiation monitoring system guide, revision 2 of tr104862 1007909. As such it is desirable to perform various preventative maintenance activities to ensure the transformer maintains a high level of performance and a long functional life. One considers a failure rate, life analysis utilizing epris transformer industrywide database, appropriate for the unit in question. Substation equipment diagnostics, conference ix, electric power research institute epri. Increasing reliability, extending life electric power research. Guided by operators positioned outside the transformer, the robots swim through the transformer oil collecting video and still images of the interior. Accurate analysis for optimal fleet ranking and maintenance mntcs provides an accurate transformer condition assessment in. Analysis of failure statistics and history test record for power transformer maintenance ekkachai chaidee, thanapong suwanasri and cattareeya adsoongnoen abstract in this paper, power transformer is selected as pilot equipment for maintenance improvement analysis because of its cost and failure consequence. A power transformer is the most costly and essential equipment piece of equipment within an electrical substation. Department of homeland security dhs and the electric power research institute epri on an emergency spare transformer program called the recovery transformer. This landmark program has resulted in the successful design, manufacture, factory testing, transportation, installation, energization, and. Hence, distribution transformer health monitoring and load management are critical aspects of smart grids.
In 1984 the electric power research institute epri introduced rcm to the nuclear power industry. Ensure that the connectors are properly used and installed in accordance with manufacturers specifications. Electric distribution transformer rarely breaks down suddenly epri, 2006. The report is a corporate document that should be cited in the literature in the following manner. Commercial nuclear power plants power and distribution transformers doe plant lifetime improvement program epri life cycle management program prepared by ogden environmental and energy services, 1777 sentry parkway west, abington hall, suite 300, blue bell pa, 19422, under contract to sandia national laboratories for the.
Guides for minimizing transformer noise proper installation of the transformer is required since a quiet transformer can develop objectionable sound levels. The content is near final, but it is expected that some changes will be made based on feedback from epri members after this report is published. Institute epri, extending the useful life of power transformers is the single most important strategy for increasing life of power transmission and distribution infrastructures, starting with generator stepup transformers gsu at the powerplant itself. Tm 5686 power transformer maintenance and acceptance. Modeling distribution system costs subject presentation from the benchmarking distribution grid integration costs under high distributed pv penetrations workshop held september 19, 2017, at the national. Oem relations, fleet problems, large failure investigations, repair procedure. Maintenance inspections solutions can be installed on virtually any transformer and allow users to perform visual, infrared and ultraviolet inspections through a single device.
Distribution transformer health monitoring and predictive. Icf assessment of large power transformer risk mitigation strategies 4 1. Conditionbased strategies for transformer age assessment. Models and formulations article pdf available in ieee transactions on power systems 28. Determining the present condition of a power transformer. The authors gratefully acknowledge the assistance of all who. A twostage framework for power transformer asset maintenance management part i. Epri journal is the flagship publication of the electric power research institute. An understanding of the power transformers components and their construction knowledge of power transformer protection an understanding of power transformers oil and oil tests and interpretation of results knowledge of the most effective power transformer electrical. Life cycle management of utility transformer assets imia, the. Data analytics and applications newsletter for epris dmd. A power transformer requires various routine maintenance. In a transformer, the only moving part is the oscillating magnetic flux in the core.
The electric power research institute epri conducts research, development, and demonstration projects for the benefit of the public in the united states and internationally. Distribution transformer health monitoring and predictive asset maintenance. The primary focus for both maintenance and asset managers is the risk assessment for transformer failure. Distribution transformer is the most vital asset in any electrical distribution network. Electric motor predictive and preventive maintenance guide electric motor failure could result in lost capacity as well as excessive repair and maintenance costs. Power factor is defined as the cosine of the phase angle between voltage and current. J the inductive capabilities of the transformer should also be considered when working on a deenergized unit.
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