Trafositetesting impulse testing lightning and switching english pdf. A presentation ontransformer testing using dpatt3bi 2. Aging of transformer oil without addition of solid insulation. Applied voltages for ir tests as a rule of thumb, an ir of 1,000m. Pdf converter convert files to and from pdfs free online. This is done by multiplying the load current amperes by the load voltage volts for single phase. Testing of insulating oil requires a oil test vessel in addition to the power factor test set. In this book we have laid down important aspects on transformer.
Repair of the transformers maintenance and repair of. We perform one group on a routine basis known as preventative maintenance, and the second group on an adhoc basis i. Purpose and scope the purpose of this standard work practice swp is to. Maintenance of transformers a detailed checklist electrical4u. Organize pages in a pdf document reorder pages, delete pages from or add new pages to your documents.
Transformers regulate the voltage in circuits, but in some cases these can go bad and cause a circuit to not. In the uk this was, until january 1995, 415 v threephase and 240 v phase to neutral. Use wire cutters and cut off the cord about an inch from the terminal so each wire is separate. It evolved from the simple gonogo verdict into a sophisticated segment within transformer manufacturing. A transformer is an electrical apparatus designed to convert alternating current from one voltage to another. This document details powersystems requirements for electrical testing of hv equipment up to and including 33kv. The core of a transformer is made of iron whereas thewinding which is wrapped over the iron core is made up ofcopper.
To start ibm cognos transformer manually, doubleclick the cogtr. Procedures for drawing transformer oil samples general sampling electrical insulating oil for laboratory analysis requires care to ensure that the sample is representative of the product being sampled. The availability of backup power feed or emergency replacement transformers, and the cost of. In order to reduce our lead times on transformer repairs, particularly on emergency service work, our transformer repair department maintains good stocks of standard laminations, frames, wire and bobbins. Acme transformers rated below 1 kva can be used on 50 hz service. All transformers are fully tested at rated voltage and load testing heat runs can be performed where requested. In addition some other tests are also carried out by the consumer at site before commissioning and also periodically. On microsoft windows 8 or windows 2012 server, doubleclick the ibm cognos transformer icon on the start panel. Current transformer testing swp check this is the latest process zone version before use. Transformer service onsite transformer testing and diagnostics 3 smit transformer service smit transformer service sts is the service department of royal smit transformers b. Measure the winding temperature, where possible, and oil temperature at the time of the test. Testing will commence only after the equipment is completely installed as per approved method statement for the installation of the transformer and released for testing commissioning. Some transformer tests are also carried out at the consumer site before commissioning and also periodically in regular and emergency basis throughout its service life. Testing of other electrical systems may be requested.
Enclosure repair and replacement options are also provided as part of the transformer repair service. Transformer testing has developed considerably over the past years. Our long experience with all types of distribution transformers translates into reliable products for any application, while our new trihal iot connected features allow you to take a step forward in efficiency. Loading capability dielectric withstand further operating characteristics tests are also part of a manufacturers internal quality assurance program. It took me about an hour to disassemble the st84 transformer removing about 36lams. If the input power does not climb to the expected value, then the problem lies not with the transformer. It can be designed to step up or step down voltages and works on the magnetic induction principle. Extract text from pdf and images jpg, bmp, tiff, gif and convert.
Routine tests and type tests of transformers electrical4u. The losses that are generated inside the transformer on load appear as heat. Check colour of active agent if silicagel is pink, change by new charge. Uk english has been selected for this document to comply with the language in iec. Format for stock statement of defectiverepaired transformer at repairers. Operation and maintenance of a gas insulated substation. Testing is the most important activity when any equipment is designed. While testing, basic testing requirements and testing codes are set out in the national and international standards. This heats the transformer and the temperature of the transformer increases. Inspection and testing of accessories and wiring are also completed as necessary. There are two main types of maintenance of transformer. Tests turns ratio, phase displacement, excitation current, vector group, winding resistance and polarity.
Pdf a procedure for diagnosis and condition based maintenance. The direct economic impact of repairing or replacing the transformer. The latest sfra test sets make these techniques more accessible, more convenient and. The project involved driver development, vb based software development and ms sql database configuration for online data collection from eight speciality measuring test instruments and automatic complex calculations for various reports and its printing for testing 4 transfomers at same time. All materials and relevant documentation to this testing works shall be checked by the responsible personnel prior to the commencement of testing activities. Peace of mind are delivered with neta electrical testing that determines the fitness of your new electrical system. If a transformer has to be repaired in a factory, the transportation time from the enduser site to. Sfra testing on transformers dismantling a power transformer to determine its condition is hardly ever a practical possibility. The insulation of the transformer is the one to get a. If you see the transformer window, your installation is working.
The abb repair facilities have access to original design files, documentation and technologies used over the last half century within the abb family as well as the current common design, manufacturing and quality practices used by abb transformer factories throughout. The vessel, or oil test cell is typically a threeelectrode system which provides guarding against surface leakage. Before attempting to draw the sample identify the type of cooling liquid in the transformer. Set the transformer on its bottom and warm up your soldering iron. All of these factors affect the amount of testing necessary to certify that a transformer is ready to be energized and placed in service. Testing power transformers highvoltage transformers are some of the most important and expensive pieces of equipment required for operating a power system.
Calibration and repair for bird wattmeter elements. Voltage transformer testing swp page 1 of 19 standard work practice sp0508 ver 7 ergon energy corporation limited abn 50 087 646 062 1. Model around small power transformers, with up to 63 mva and up to. A fault leading to an open secondary could cause the primary current to overwhelm the insulation, causing the winding to short circuit. Abb is ideally positioned to get failed or atrisk transformer assets fully upandrunning in record time because of access to original design files and documentation of technologies.
Our data acquisition systems provide key features for complete power transformer testing. Pdf over the last decade there has been a renewed and increased interest in. Tests serve as an indication of the extent to which a transformer is able to comply with a customers specified requirements. Losses of transformersthe transformers are made of 2 types of materials. Superior technical support is extremely important to us. Wood technicians can also carry out the above repairs onsite, if necessary and feasible. There are various test required on transformer to conform performance of transformer.
In a shelltype shell form transformer, the steel magnetic circuit core forms a shell surrounding the windings. Testing of power transformers seems like a similar experience. Usually consists of a solid copper rod surrounded by porcelain. Because troubleshooting and repair require understanding how the system works. Wood maintains a repair shop on our premises which can accommodate transformers up to 5 mva for indoor repairs and an outdoor area to accommodate transformers of any size for repair or refurbishing. Transformer service factory repairs and refurbishment of.
Mainly two types of transformer are done by manufacturer before dispatching the transformer mainly 1 type test of transformer and 2 routine test. Free online ocr convert pdf to word or image to text. Current transformers play an important role in the monitoring and protection of electrical power systems. Multimeters required features minimum can measure up to 50 vdc can measure up to 250 vac measures resistance or continuity desirable features can measure entry level current to approximately 250 milliampere can measure dc and ac current up to 10 amperes. The purchase, preparation, assembly, operation and maintenance of transformers represent a large expense to the power system. Transformer service factory repairs and refurbishment of transformers the environmental friendly and economical solution todays question most industrialized countries developed their electrical infrastructure during the 1960s and 1970s. Full test certificates detailing temperature rise and reactance are available. Abbs onsite repair is achieved by bringing the transformer factory setup to the.
Connection on cpc100 will be same as the shown figure. Repeat the test for the other phases and the other secondary cores. May 10, 20 transformer manufacturers perform two main types of transformer testing type test of transformer and routine test of transformer. Service supports 46 languages including chinese, japanese and korean.
Pdf power transformers are important and expensive components in. With over 50 years of experience, transformer service, inc. This document applies primarily to the maintenance and diagnostics of oilfilled. The testing of power transformers makes a couple of different measurements necessary, which are described in the international iec 60076 standard. Tm 5686 power transformer maintenance and acceptance testing. By using the latest proven sfra test techniques, it is possible to accurately assess transformer condition without dismantling it. Corrective and emergency testing may also be requested. Page 1 of 9 standard work practice sp0507 ver 5 ergon energy corporation limited abn 50 087 646 062 ergon energy queensland pty ltd abn 11 121 177 802 1. Extra 10% of total oil quantity for each transformer shall be supplied along with the transformers in sealed non returnable drums. The tool will instantly upload and transform the file into a pdf. Predictive maintenance is the complement of preventive maintenance. Both paper and oil which are used for insulation in the transformer start get. About the coil when you are finished with the lams, you will have the bare transformer coil, as seen at left.
March tech tip common repairs for the zw transformer. Pdf increase transformer reliability and availbility. Introduction the procedures stated in this document cover the activities in preliminary tests and inspections, functional performance tests and the commissioning of newly completed installations and existing ones after major alteration. Full factory repair or upgraderetrofit and testing transformer repairs. Maintenance and repair of medium power transformers. Technical information such as the nameplate data, electrical test data before and after repair, details of the repairs requested by the customer, the repairs. Onsite transformer repair trafositerepairtm get your. Abb is ideally positioned to get failed or atrisk transformer assets fully upand running in record time because of access to original design files and documentation of technologies.
During construction, and before, startup, new electrical systems and components must meet application specifications, manufactures tolerances, installation and construction codes and standards, and system design specifications. I wrote an article for the neta world magazine in 2004 that covers several different manual techniques for current transformer testing that should help even the most experienced technicians. Following tests shall be conducted on traction transformer. Transformer services from testing, to pcb transportation and. Even a transformer for a uhv test line of 1785 kv system voltage has been delivered. Tbm, to examine and repair the transformers offline.
A transformer has no moving parts and is a completely. However, any 50 hz transformer will operate on a 60 hz service. Projects on transformer, distribution transformer, electrical transformer, current transformers, distribution transformers repairs, transformer oil, voltage. Since transformers are normally very reliable components, few. Size and kva rating also dictate the kind and number of auxiliary devices a transformer will require. The need for a comprehensive current transformer testing regime is evident when the alternative is considered. Remove the two coil support straps and the rear core support bracket. Electrical insulation testing of hv equipment up to 33kv. Cts are instrument transformers used for converting primary current into a reduced secondary current for use with meters, relays, control equipment and other instruments. The ecodesign directive of the european union and the related regulation 5482014 for transformer losses requires manufacturers to publish on the internet information on rated power, load loss, noload loss and weight and type of the major components of typical transformers, which are. Add text to pdfs add text fragments to pdf files of any type, even to pdfs which were obtained with a scanner. Facilities instructions, standards, and techniques. Usually, nonfaultinitiating earthing switches have the same type of operating mechanisms and method of discovering switch status as disconnect switches. We also have facilities to supply non standard items such as custom cut core on non standard units.
Pole mounted and secondary ground mounted transformers 14. The maintenance work of power transformer of 3311 kv ss under nesco area. Whether you attend classes at our learning facility in tallmadge, ohio, study online using our elearning sessions, or bring our instructors to your facility, the transformer maintenance and management training solutions from sdmyers cover everything you need to know to keep your. The indirect economic impact due to production loss. If the transformer is liquid filled, the pcb concentration should also be clearly shown on the service order with supporting documentation from the customer or test lab.
Skraceni maintenance and repair of medium power transformers. If the input power climbs to the expected value, the primary of the transformer is bad. Transformer testing preliminay test carried out on transformer before it is put into the tank. Our skilled technicians will conduct electrical ttr, megohmetter testing tests on core and coil, and dielectric strength tests on the insulating oil to determine if repair, reconditioning or rewinding is advisable. Medium voltage transformers discover our range of drytype, oil and power transformers from medium voltage up to 170kv. A power transformer requires various routine maintenance tasks including measurement and testing of different parameters of the transformer. Complete power transformer testing solution dewesoft. Because of the economic motivation, preventive tests and. Testing and commissioning procedure for electrical installation 1.
Purpose and scope the purpose of this standard work practice swp is to provide guidelines for testing methods for capacitive and inductive voltage transformers. Transformers 1 kva and larger, rated at 60 hz, should not be used on 50 hz service, due to the higher losses and resultant heat rise. Through the utilization of various nondestructive testing and measuring techniques, predictive maintenance determines equipment status before a breakdown occurs. Heres a summary of the current transformer testing paper. Transformers are an electrical component that transmit electrical energy between at least two circuits. This is important as the test cell capacitance is small and even small. Transformer protection application guide a free service. Wood technicians can also carry out the above repairs onsite, if.
Maintenance and repair of medium power transformers wapic, lagos, nigeria, 27. The current transformer is solely assessed through its external behavior without considering what is happening inside. Sdmyers offers a comprehensive range of transformer management and operations training for all levels of employees. Nov 26, 2010 traditional current transformer testing follows a blackbox approach. Nov 17, 2019 a power transformer requires various routine maintenance tasks including measurement and testing of different parameters of the transformer. Power transformer maintenance and acceptance testing by. Remove the rest of the old cord from the bottom of the case.1346 790 808 1269 1262 1396 863 1562 1555 1424 1077 1192 1559 416 1099 1502 1075 1388 998 82 130 300 1184 1281 1095 384 901 220 1229 862 200 647