Dry type transformer maintenance summary see section 3. Participants will receive instruction on the filtering and drying out process to be performed on transformers. Records should be kept giving details of any abnormalities during service and also of any periodic test result taken. The maintenance should consist of regular inspection, testing and reconditioning whenever necessary. Jun 27, 2018 this webinar will introduce field technicians to the fundamental standards for transformer maintenance and testing. Insulation resistance of the ct has to be checked on an annual basis. Nevertheless, many procedures completed during routine. Transformer, operation, testing and maintenance 33kv and below 9. Singlephase transformers may be specified for hydraulic stations because of transport. Maintenance of transformer power transformers maintenance. However, equipment failure can be delayed through appropriate electrical preventive maintenance. 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.
Transformer, operation, testing and maintenance 33kv and. I his guide covers general recommendations for the operation and maintenance of liquid filled the successful operation of these transformers is dependent on. Reclamation has hundreds of power transformers with voltages as low as 480 volts v and as high as 550 kilovolts kv. The nameplate rating on the unit should be checked against the job specifications to ensure installation of the correct transformer. Maintenance procedure of transformer rajasthan power. Preventive maintenance maintenance transformer service. As a result of the owner company, the importance of the machine and the outage possibilities, it is necessary to perform on each transformer a fitted maintenance program with a test protocol previously accorded. White paper maintenance inspection windows on transformers oil sampling ports can also be brought outside of the transformer cable compartment with several vendors offering retrofit kits that permit safe sampling as well as providing an optional external pressure gauge and nitrogen insert to relieve vacuum. Predictive maintenance is the complement of preventive maintenance. Aug 10, 2017 in this post, i will discuss the schedule and overhaul maintenance for a power transformer. Tap changer overhaul preventive maintenance maintenance abb.
Standard for testing specifications electrical power. This transformer has been manufactured using modern techniques and some of the best available raw materials internationally. Maintenance of transformers a detailed checklist electrical4u. Transformer installation, operation, and maintenance manual. This webinar will introduce field technicians to the fundamental standards for transformer maintenance and testing. Distribution transformers maintenance guide for liquid.
Sunbelt transformer liquidfilled transformer instruction and maintenance manual 2 1 introduction the instructions in this booklet apply to liquidfilled transformers manufactured by sunbelt transformer in temple, tx, sharon, pa and bakersfield, ca. The time between these periodic inspections may be increased if the first internal inspection of. Schedule preventive maintenance for power transformer. Distribution transformers maintenance guide for liquid filled.
Preventive maintenance a preventive maintenance schedule consists of regular inspections and component replacements according to the product specific maintenance schedule. In 2005, this document was approved for the first time as an american national standard. Preventive and predictive maintenance 700zb00102 42 preventivepredictive 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. In the event of any doubt, query arises or need for any further information or any irregularity deviation from iec bs is equivalent 1. Purpose this document is to provide guidance to bureau of reclamation reclamation powerplant personnel in maintenance, diagnostics, and testing of transformers and associated. Check the resistance of the windings with an ohmmeter.
Maintenance schedules are based on abbs decades long experience of manufacturing and maintaining its products. The transformer should be connected only as described on its nameplate. Strip the cable of its insulation to the desired length without ringing or nicking the wire. Nevertheless, the hipot test for routine maintenance is typically not applied to transformers because of the possibility of damage to the winding insulation. A preventive maintenance schedule consists of regular inspections and component replacements according to the product specific maintenance schedule. A transformer manufactured by sts, is designed, manufactured and tested with the latest technology and with strict quality control so as to ensure a long and problem free service.
It has been fully tested before leaving our factory. Power transformer maintenance the objective of this course is to outline the suggested work procedures that are typically performed for transformer preventive maintenance. Introduction to reclamation transformers transformers rated 500 kilovoltamperes kva and above are considered power transformers. The transformer should give you years of trouble free service, provided regular maintenance checks are carried out as prescribed. Pdf guide for transformer maintenance guide for transformer. The most frequent attention given to power transformers is visual inspection, which involves mainly checking the transformers general exterior condition and cooling system. Tap changer overhaul preventive maintenance maintenance. Full on site test run with out normal power if possible.
The transformer should be carefully inspected for any damage due to handling after receipt. Neta is not only for commissioning new equipment but for testing the reliability and performance of existing equipment. For batter and smooth operation, these two types of transformer maintenance should perform. Drytype transformer maintenance checklist napces blog. In this book we have laid down important aspects on transformer. A regular maintenance program allows the transformer oil to be upgraded before sludge created by oxidization occurs. This course uses uptodate test equipment and procedures for evaluating the condition of a transformer. Transformer, operation, testing and maintenance 33kv and below. Since 1989, revised editions of the maintenance testing specifications have been published in 1993, 1997, and 2001. Nov 17, 2019 a power transformer is the most costly and essential equipment piece of equipment within an electrical substation. Factors resulting from interconnections and power networks to aging equipment and the.
Transformer oil maintenance electric energy online. Troubleshooting procedure main breaker trips remove the lightning arrestors and try again. Standard for an electrical preventive maintenance epm program. With predictive devices currently available, it is incumbent upon. Liquidfilled transformer instruction and maintenance manual. Apply an antioxidant compound to all aluminumto copper connections. In this post, i will discuss the schedule and overhaul maintenance for a power transformer.
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. If a hum is present, the primary is probably working and the secondary is open. Skraceni maintenance and repair of medium power transformers. The degree of maintenance and necessary inspection for its operation depends on its. This results in a cost saving to the transformer owner. Transformer testing has developed considerably over the past years. A power transformer requires various routine maintenance. If input voltage is present, check for an audible hum. The 2011 standard for maintenance testing specifications for electrical power equipment and systems is the most. Ensure that the connectors are properly used and installed in accordance with manufacturers specifications.
Generator system preventive maintenance and contingency planning. Modern transformers are designed to closer tolerances than transformers in the past. Ensuring a long life for your transformer english pdf leaflet factory. Transformers have been used at powerplants since the inception of alternatingcurrent generation, a century ago.
For batter and smooth operation, these two types of transformer maintenance should perform schedule preventive maintenance for power transformer first of all visual inspection. Standard for an electrical preventive maintenance epm program page 210 andor connectors are used together, examine connections for signs of galvanic action. A good maintenance program will help ward off some component failures, and basic. Many organizations work hard to create a contingency plan, but never test it. Operation and maintenace manual for our fluid filled. Check colour of active agent if silicagel is pink, change by new charge.
Testing of power transformers seems like a similar experience. Field testing of a power transformer before putting into service 50mva. Maintenance and repair of medium power transformers wapic, lagos, nigeria, 27. Project manager strategic commercial department koncar distribution and special transformers inc. Power transformers must be inspected regularly so that problems can be detected early and corrected before major repairs are needed. Through the utilization of various nondestructive testing and measuring techniques, predictive maintenance determines equipment status before a breakdown occurs. This course uses uptodate test equipment and procedures for evaluating the condition of a. Factors resulting from interconnections and power networks to aging equipment and the declining pool of technical experts add to the challenge. A power transformer is the most costly and essential equipment piece of equipment within an electrical substation. While operating principles of transformers remain the same, the challenges of. For an extended life and optimal performance of your drytype transformer, maintenance activities are highly recommended on a periodic basis. Once sludge occurs, the internal parts of the transformer require flushing with hot oil to remove the sediment.
Standard for an electrical preventive maintenance epm. Thus, effective, regular maintenance and testing is even more essential to. Basics, maintenance, and diagnostics vii contents continued page 4. White paper maintenance inspection windows on transformers. Transformer schedule and overhaul maintenance an electrical. When their power fails, its as if they never made a plan at all. Students learn instruction to install, maintain, repair or troubleshoot power transformers rated 765 kv or less. So you just need to follow this procedure for a power transformer. 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. Predictive power transformer maintenance as an effective maintenance system.
Preventive maintenance maintenance transformer service abb. Generator system preventive maintenance and contingency. Electrical equipment deterioration is normal and equipment failure is inevitable. The transformer inspection checklist below covers important checkpoints for routine maintenance. The instructions and guidelines provided should only be performed by trained personnel. This standard covers the basic procedures for the periodic inspection.
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