Students will learn electrical transformer basics transformer design and operation, as well as safe and proper maintenance and testing procedures on power transformers. Transformer testing is an essential part of maintaining your equipment. Transformer testing has developed considerably over the past years. Transformer maintenance and proper installation is critical for insuring the extended life of your transformer. A power transformer requires various routine maintenance tasks including measurement and testing of different parameters of the transformer.
Our technical team can help to design, modify and reverse engineer to your specification. Electrical preventive maintenance epm program electrical related fires are a common occurrence. The standard for maintenance testing specifications for electrical power equipment and. Predictive power transformer maintenance as an effective maintenance system.
Transformer testing allows this aging process to be quantified and tracked, to help predict replacement intervals and avoid failures. Every year, electrical fires result in hundreds of deaths, thousands of injuries and hundreds of millions of dollars in property damage. Power transformer maintenance and acceptance testing on photo. Ac dielectric test for acceptance and routine maintenance for liquidfilled power transformers. Acronyms and abbreviations a air ana selfcooled, nonventilated kw kilowatt ansi american national standards ieee institute of electrical and institute electronic engineers cegb central electric generating mdw moisture by dry weight board mg milligram cfm cubic feet per minute mva megavoltamps ch 4 methane nd not detected c 2 h 2 acetylene n 2 nitrogen.
Readings should be 1% or less on older equipment that has been in service for a number of years. The paper also presents some of the advantages of routine maintenance for the transformer user. Periodic testing and maintenance of power transformers to. Current transformer testing is also an important part of electrical substation maintenance. Transformer maintenance electrical testing solutions. So for ensuring proper performance of electrical power transformer, voltage and. C electrical power from one voltage to another voltage keeping the frequency same by.
Protective relays can only operate adequately if they receive the correct secondary current from the cts. It is very useful video for electrical engineering students for understanding of transformer maintenance with basics of transformer parts, testing, observation, field knowledge etc. Telltale signs of inadequate electrical products include. Therefore, ensuring the performance of electrical testing and maintenance on critical transformers is very important to electrical system reliability. Electrical testing solutions can perform your transformer maintenance for all manufacturers to 110kv nonpcb. The international electrical testing association neta is an accredited standards developer for the american national standards institute ansi. Although maintenance and work practices are designed to extend the transformers life, it is inevitable that the transformer will eventually deteriorate to the point that it fails or it must be replaced. Property damage andor physical injuries due to electrical fires can be devastating. Neta has been an accredited standards developer for the american national standards institute since. Testing of power transformers seems like a similar experience. Transformer maintenance testing of transformers zpower factor test or doble test readings should be.
Solutions for electrical substation maintenance smc. Participants will receive instruction on the filtering and drying out process to be performed on transformers. We will also look at the latest developments in transformer design, construction, testing. Oil levels of mog magnetic oil gauge of the main tank and conservator tank.
In 2005, this document was approved for the first time as an american national standard. Mention1167659rahuluttammention downloading study material is very easy first search for the study material by typing the name of the book in the search book on the home page of the site, then by clicking on the attachment or following the url download will start automatically. Department of the interior bureau of reclamation technical service center infrastructure services division. Introduction to transformer testing solid insulation transformer oil testing transformer oil moisture in transformers dissolved gas analysis analysis for furanic compounds and nonroutine oil tests electrical testing principles interpreting oil test results and maintenance options part 3. These activities will increase the transformerss service lie and help to make the transformers operation both safe and troublefree. Power transformer maintenance and acceptance testing.
Transformer inspection and testing electrical power plant maintenance book 1 kindle edition by smith, wayne. Power transformer testing testing of power transformers 2. We will repair or recondition your current transformer. References appendix a contains a list of references used. Pdf transformer is a static device which transforms a. Also some maintenance tests are referred as well as.
There is a group of maintenance techniques that from an electric point of view and through some field tests are going to allow us to trace the transformer status as. Electrical transformer training testing and maintenance. This paper deals with the analysis of maintenance type of transformers, in connection with power transformers testing. Knowledge of the most effective power transformer electrical tests. Best practices for the installation and inspection of dry. Apply an antioxidant compound to all aluminumto copper connections. The course covers transformers used in commercial and industrial power distribution systems, including oil and drytype units. Austin energys substation maintenance power transformer hot oil processing and vacuum.
Maintenance of transformer with basic understanding in. Facilities instructions, standards, and techniques. The raptor includes in one unit current, voltage and power transformer testing, and other functionalities circuit breaker and switchgear testing. Mainly two types of transformer testing are done at manufacturer premises type test of.
Standard for an electrical preventive maintenance epm program page 210 andor connectors are used together, examine connections for signs of galvanic action. Electrical engineers that perform transformer testing, maintenance, repair, and electrical infrared inspection of both dry and oil filled transformers. Nfpa 70b and csa z463 standards for electrical maintenance. The first neta maintenance testing specifications for electrical power equipment and systems was published in 1975. This article covers electrical testing and maintenance items recommended by the international electrical testing association neta and other industry best practices for transformers above 500 kva. The ac hipot test values for voltages up to 69 kv are presented in table 1. The transformer is one of the most reliable pieces of electrical distribution equipment. The checklists are in pdf format and can be completed electronically or printed and used as hard copy. If your electrical transformer has oil filling bushing, make sure that the oil is filled up to the correct level. Pdf guide for transformer maintenance guide for transformer. Electrical power equipment maintenance and testing 2nd edition. Basics, maintenance, and diagnostics xi contents continued page 9.
Testing power transformers highvoltage transformers are some of the most important and expensive pieces of equipment required for operating a power system. The paper discusses routine tests for power transformers to evaluate their general condition and spot for possible problems. Ac dielectric test for acceptance and routine maintenance for liquidfilled power transformers transformer. In their simplest form, transformers are a type of electrical component that transmits electric energy between at least two separate circuits. Onsite transformer maintenance r baker electrical ltd uk.
Look on the transformer for the required clearances, as these are manufacturers instructions and you must comply with them. Download it once and read it on your kindle device, pc, phones or tablets. Find here insulation testing and continuity, power protection, power transformer testing, power cable infrastructure, cable fault location, general electrical test. The checklists are intended to help inspectors keep track of the numerous aspects of an electrical installation. Weidmann electrical equipment, testing, and insulation.
In this book we have laid down important aspects on transformer. Remove any corrosion on battery terminals with bicarbonate of soda. This document applies primarily to the maintenance and diagnostics of oilfilled power. On stranded cable, if ends are corroded, cut off ends or separate strands and clean internally. Since 1989, revised editions of the maintenance testing specifications have been published in 1993, 1997, and 2001. Here are 3 maintenance tests you should run on your transformer on a daily basis. Hmt harmonic mitigating transformer hmt is better able to handle the harmonic currents present in todays electrical power system. Standard for testing specifications electrical power. Powercom also specializes in transformer oil analysis. Ensure that the connectors are properly used and installed in accordance with manufacturers specifications. An understanding of power transformers oil and oil tests and interpretation of results. Transformer inspection and testing electrical power plant.
Our electrical team complements its outstanding manufacturing and repair service with a reliable transformer maintenance and onsite repair service, consisting of a wide range of electrical work including transformer installation and a 24hr reactive maintenance inspection and testing. Committee began work on a maintenance document, and maintenance testing specifications for electrical power equipment and systems was published in 1975. This course uses uptodate test equipment and procedures for evaluating the condition of a transformer. We perform one group on a routine basis known as preventative maintenance, and the second group on an adhoc basis i.
Students learn instruction to install, maintain, repair or troubleshoot power transformers rated 765 kv or less. Highspeed protection of power transformers by biased differential harmonic restraint. The purchase, preparation, assembly, operation and maintenance of transformers represent a large expense to the power system. Pdf transformer testing type test and routine test of. This manual contains a generalized overview of the fundamentals of transformer theory and operation. Check colour of active agent if silicagel is pink, change by new charge. Standard for an electrical preventive maintenance epm program page 410 connections. Use features like bookmarks, note taking and highlighting while reading transformer inspection and testing electrical power plant maintenance book 1. This pdf contains 77 electrical inspection checklists taken from the 2014 electrical inspection manual with checklists. Transformer, operation, testing and maintenance 33kv and below 9.
A catalogue, for quick reference, of the range of megger test instruments for the maintenance of electrical power systems. It evolved from the simple gonogo verdict into a sophisticated segment within transformer manufacturing. 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. The course topics include transformer and auxiliary protection design, factory and field testing and commissioning issues, and advanced transformer electrical and insulation fluid testing and assessment techniques.