Standard for an electrical preventive maintenance epm program page 210 andor connectors are used together, examine connections for signs of galvanic action. Predictive maintenance involves extra monitoring and testing, whereas corrective maintenance considers repairing and restoring transformer integrity to its original condition when degraded conditions are found. Management commitment responsible and qualified personnel employee training regularly scheduled inspection survey and analysis of electrical equipment and systems to determine maintenance requirements and priorities. The spare parts that are given with the three phase padmounted transformer have to be keep on a clean and dry place. The preventative maintenance of transformer involves routine inspection, adjustment, testing, minor repairs, and special handling instructions. Regular preventive maintenance helps facilitate forward budget planning. Drytype transformer maintenance checklist napces blog. Disconnect the ac input and isolate the transformer. Maintenance of transformer power transformers maintenance. This approach consists of completing preventive, predictive and corrective maintenance. The preventive maintenance involves schedule maintenance and regular testing. However, tests or measurements are also carried out to assess the condition of the equipment.
There are many different preventative maintenance actions to be performed on a power transformer. Drainage of transformer sludge, etc, form the conservator. You may detect some fittings problem on the transformer body. The maintenance paragraphs give real life experiences from existing gis technology that has been in service for a number of years. Transformer preventative maintenance equipment sdmyers. The main point of concern in ageing and the life expectancy of transformers is the condition of the insulation system, which is typically based on organic products. To keep the drytype electrical transformers in proper working condition, the following checks need to be undertaken. To develop suitable texts relating to preventive maintenance of electrical systems and equipment used in. A brief introduction has been provided in this section. Preventive and predictive maintenance 700zb00102 42 preventive predictive maintenance the guiding principle of ppm is the regular and systematic application of engineering knowledge and maintenance attention to equipment and facilities to ensure their proper functionality and to reduce their rate of deterioration.
Different types of maintenance being done on equipment are. Modern transformers are designed to closer tolerances than transformers in the past. Remove these connections before reenergizing the transformer. Transformer preventative maintenance involves routine inspection, adjustment, testing, minor fixes, and special handling instructions. These connections should be removed before reenergizing the transformer. Remove any corrosion on battery terminals with bicarbonate of soda. The recommended procedures specified in this chapter do not pertain to the major overhaul and repair of a transformer. Very high secondary currents are developed in resistance welding equipment.
The water supply must be sufficient and at the proper temperature, pressure and. Tap changer overhaul preventive maintenance maintenance abb. Also, the troublefree service of the equipment over its life depends on proper installation, operation, and maintenance. The degree of maintenance and necessary inspection for its operation depends on its. It describes the nature and sources of defects including their repair and. Preventive maintenance means preventive action against failure occurrence and is abbreviated as pm. Location the three phase padmounted transformer location should provide enough space. You may detect some fittings problem on the transformer body and eliminate the problem. Pdf power system consists of a number of transformers at substations. However, many tasks performed during routine maintenance and major overhaul of. Abb your partner for transformer field services english pdf brochure power. Get instant fault updates on your transformer dashboard via a secure cellular modem with our guardian monitoring service.
In addition, the troublefree operation of the equipment over its life is dependent upon proper installation, operation, and maintenance, which are discussed in section 5. Adding the transformer oil if necessary always check the oil gauges. This preventive maintenance exerts its power effectively during the wearout failure period in the bathtub curve. The life of your dry type transformers can be improved with proper maintenance. Always deenergize a transformer and ground its case before entering or working on the transformer. Operation and maintenance of a gas insulated substation. Standard for an electrical preventive maintenance epm program page 410 connections. Standard for an electrical preventive maintenance epm program.
Your perfect guide for dry type transformers maintenance. Schedule preventive maintenance for power transformer. A power transformer is the most costly and essential equipment piece of equipment within an electrical substation. This, coupled with compact design, high upset temperatures, and fast. Nov 17, 2019 a power transformer is the most costly and essential equipment piece of equipment within an electrical substation. Where applicable, additional suggested practices are presented for a more thorough epm program.
Basics, maintenance, and diagnostics vii contents continued page 4. Aug 10, 2017 schedule preventive maintenance for power transformer. Power transformer installation, acceptance, and maintenance procedures. Because drytype transformers are used so extensively in industrial, commercial, and institutional power distribution systems, their maintenance should be a. Standard for an electrical preventive maintenance epm.
An effective electrical preventive maintenance program should consist of the following essentials elements. Hence preventive maintenance is always cost effective and time saving. Maintenance of current transformer a current transformer is a vital part of any equipment installed in an electrical substation for protection purposes as well as for electrical measurement. Facilities instructions, standards, and techniques. A read is counted each time someone views a publication summary such as the title, abstract, and list of authors, clicks on a figure, or views or downloads the fulltext. Reception, installation, operation and maintenance manual. Preventative diagnosis and maintenance of transformers has become more.
Preventive maintenance maintenance transformer service. Tap changer overhaul preventive maintenance maintenance. Oilimmersed transformers preventive maintenance equipment. For an extended life and optimal performance of your drytype transformer, maintenance activities are highly recommended on a periodic basis. As such it is desirable to perform various preventative maintenance. The transformer inspection checklist below covers important.
Factors resulting from interconnections and power networks to aging equipment and the declining pool of technical experts add to the challenge. Preventive and predictive maintenance 700zb00102 42 preventivepredictive maintenance the guiding principle of ppm is the regular and systematic application of engineering knowledge and maintenance. Fist 41b, maintenance scheduling for electrical equipment 5c. General preventative maintenance guideline requires a yearly inspection of component x for transformers type y. Ensure that the connectors are properly used and installed in accordance with manufacturers specifications. Nov 08, 2015 preventive maintenance of transformers the objective of this section is to outline the recommended work practices that are usually performed for preventive maintenance of transformers.
The main point of concern in ageing and the life expectancy of transformers is the condition of the insulation system, which is. Any failure to the transformer can extremely affect the whole functioning of the organization. It is a particularly important type of maintenance. Location the three phase padmounted transformer location should provide. If input voltage is present, check for an audible hum. Distribution transformers maintenance guide for liquid filled. A good maintenance program will help ward off some component failures, and basic troubleshooting skills will bring the rectifier back on line.
Insulation resistance of the ct has to be checked on an annual basis. The operational life of a transformer begins with commissioning after it is installed in a substation. Transformer schedule and overhaul maintenance an electrical. On stranded cable, if ends are corroded, cut off ends or separate strands and clean internally. The preventative maintenance of transformer involves rou tine inspection, adjustment, testing, minor repairs, and special handling instructions. The utility engineer must be familiar with all aspects of maintenance and testing and make use of stateoftheart tools and techniques for evaluating transformer. An electrical transformer is the most costly and essential equipment piece of equipment within an electrical substation. Our inhouse technical services ts department is comprised of highly qualified and experienced technical personnel. Pdf guide for transformer maintenance guide for transformer. Project manager strategic commercial department koncar distribution and special transformers inc.
Check the resistance of the windings with an ohmmeter. Apply an antioxidant compound to all aluminumto copper connections. Power transformer maintenance includes periodic electrical testing of different parameters of the transformer, being. Predictive maintenance involves extra monitoring and testing, whereas corrective maintenance considers. Maintenance and repair of medium power transformers wapic, lagos, nigeria, 27. The transformer inspection checklist below covers important checkpoints for routine maintenance. The transformer should be deenergized before maintenance, and the transformer terminals should be connected to the ground.
This has led the utilities to adopt conditionbased maintenance of the equipments rather than usual preventive maintenance being carried out at a fixed interval of time. The preventive maintenance involves schedule maintenance and regular. Reception, installation, operation and maintenance manual for. Check colour of active agent if silicagel is pink, change by new charge. Preventive maintenance maintenance transformer service abb. If a hum is present, the primary is probably working and the secondary is open. This paper will describe the power transformer preventive maintenance program implemented by aedc. Apart from special test equipment, the most common portable test equipment used in transformer maintenance activities is.
Recommended practice for electrical equipment maintenance nfpa 70b details preventive maintenance for electrical, electronic, and communication systems and equipment such as those used in industrial plants, institutional and commercial buildings, and large multifamily residential complexes to prevent equipment failures and worker injuries. The degree of maintenance and necessary inspection for its operation depends. Safety to minimize unsafe conditions avoid personnel injuries reliability centered maintenance is directed by safety first, then. The best way of protecting a transformer is to have good preventive maintenance schedule. During the life of a transformer, the user has to establish a maintenance strategy that will ensure the appropriate level of reliability and an optimized operational life. Insulation testers megger 3 earthing test equipment.
Reliability centered maintenance is directed by safety first, then economics. Preventive maintenance through inspection and rehabilitation ensuring a long life for your transformer a transformer is from its inception of operation impacted by stress due to internal and external factors which affects the potential life time and availability of operation. 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. Hanover risk solutions standard for an electrical preventive.
Report of committee on electrical equipment maintenance. These require regular maintenance to prevent permanent break down. Predictive maintenance pdm definition techniques that help determine the condition of inservice equipment in order to predict when maintenance should be performed primary goal minimize. Recommended practice for electrical equipment maintenance nfpa. Skraceni maintenance and repair of medium power transformers.
Power transformer maintenance includes periodic electrical testing of different parameters of the transformer, being common the periodic checking of some key magnitudes such as turns ratio, excitation current, polarization index, insulation resistance, tandelta, winding resistance, short circuit impedance, etc. Important components in power transformer to consider for preventive maintenance. Recommended practice for electrical equipment maintenance. Maintenance of transformers a detailed checklist electrical4u. Tap changer overhaul and upgrade proper load andor onload tap changer ltc oltc maintenance has become increasingly complex even for the best utility and industrial managers. When determined that safety is not a factor, then preventive maintenance is justified on economic grounds. The guiding principle of ppm is the regular and systematic application of engineering knowledge and maintenance attention to equipment and facilities to ensure their proper functionality and to reduce their rate of deterioration. Thus, effective, regular maintenance and testing is even more essential to. Steel itself is a conductor, and changing lines of magnetic flux also induce a voltage and current in this conductor. This, coupled with compact design, high upset temperatures, and fast cycle times, makes the need for proper cooling apparent. To develop suitable texts relating to preventive maintenance of electrical systems and equipment used in industrialtype appli. Maintenance intervals are normally fixed on the basis of type of equipment and sometimes on the equipment history.
Transformer service technical flyer preventive maintenance. Distribution transformers maintenance guide for liquid. Preventive maintenance through inspection and rehabilitation ensuring a long life for your transformer a transformer is from its inception of operation impacted by stress due to internal and external factors. Predictive power transformer maintenance as an effective maintenance system.
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