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