Rate contract order for repairing of damaged defective distribution. Bb36000 locomotive traction transformer repair english pdf reference case study bb7200 shell type dc traction transformer repair english pdf reference case study etr500 high speed train traction transformer repair english pdf reference case study. In power transformer the flux density is higher than the distribution transformer. Abb supplies the widest range of power distribution transformers, including specific designs for power centres, substations, networks and padmounts. Distribution transformer repairs workshop repairs repairs. Due to rising usage in the commercial as well as purposes and modern infrastructure. Key difference between power transformer and distribution transformer. This highly participative euromatech training course is designed to provide participants with the skills to understand the requirements of a comprehensive testing, analysis and troubleshooting programme to maintain and prevent major faults from occurring in power and distribution transformers. Such as single phase transformer, three phase transformer, pole mounted transformer, pad mounted transformer, and underground transformer. The invention of a practical efficient transformer made ac power distribution feasible. All transformers are oil filled, 65c rise, and designed for usual service conditions per ieee c57.
Skraceni maintenance and repair of medium power transformers. Maintenance instructions for power transformers maintenance schedule sl no inspection frequency items to be inspected to be checked action required if inspection shows unsatisfactory. Identify transformer polarity using dot and conventional labeling. Among the materials consulted while preparing this book are. The weight and volume of oil in the transformer shall be clearly stated. It is not intended to replace the manufacturers or the customers instructions or specifications. Spare parts calibration repair request ra number technical support operating manuals iso 17025 calibration service. When a distribution transformer is installed inside a building or enclosure. Even our standard solutions are special in almost every place where people live and work you will find at least one transformer.
The distribution transformer market is segmented on the basis of power rating, mounting type, phase, and insulating type. Distribution transformer handbook is packed with practical information on transformer concepts, singlephase and threephase transformer connections, and procedures for installing overhead and padmount transformers. Describe how to troubleshoot a transformer fault in which only the transformer primary fuse is blown. As one of the largest power transformer manufacturers in china, tsty electric co. The use of lowerloss mediumvoltage, liquidimmersed distribution transformers that go beyond the u. The bushings insulate the current carrying conductor from the tank. Distribution transformers can be shipped complete in standard shipping container. Upon receipt of the transformer in the factory for repair, a visual and electrical control will be performed. Participants will receive instruction on the filtering and drying out process to be performed on transformers.
If an oilfilled, indoortype transformer is stored outdoors it should be thoroughly covered to keep out rain. Distribution transformers ranging from 315 kva to 5 mva are readily distributed. But as long as it keeps working and supplying power to the escalator in the department store, the hotel. Avoiding distribution transformer energy waste products. 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. Primary high side distribution voltage is from 2400 volts to 34,400 volts. Pdf distribution transformer handbook oscar mayorquin. Annex a technical specifications for distribution transformers. Distribution transformer handbook alexander publications. The technician distribution transformer repair conducts necessary testing and inspection of faulty transformers to determine the root cause of.
We perform one group on a routine basis known as preventative maintenance, and the second group on an adhoc basis i. Color of silica gel in breather in dry state is pssn3005 a white b pink c yellow d blue 50. Automated distribution class transformer test systems multiple test stations for. Some companies do the bare minimum to resell a used transformer, and will neglect to address problems that will lead to failure. Distribution automation handbook prototype elements of power d istribution systems 1mrs757959 4 3 elements of power distribution systems 3. Look for and repair loose clamps, coil spacers, deteriorated barriers, and. Productspower transformerdistribution transformerelectric. Both abb protective links and drawout fuses offer protection to the distribution system should an internal transformer fault occur. Due to transport limitation and for convenience of storagehandling at site, if a unit can be dispatched completely assembled then the transformer is usually dispatched from the factory with. Connections to the transformer primary windings are at the top of overhead and underground transformers, and the left panel of padmount transformers. Department of energys conservation standards can yield large energy and monetary savings over the units lifetime. Distribution transformers are normally considered to be those transformers which provide the. What is a transformer tap changer engineering tutorial. Technical data distribution transformers tunorma and.
Project manager strategic commercial department koncar distribution and special transformers inc. Also there is detailed analysis about the consisting of a distribution transformer. Difference between power transformer and distribution. Pdf the objective of the paper is to do proper inspection procedure of failed distribution transformer will reduce the repairing cost. In a transformer, the only moving part is the oscillating magnetic flux in the core. Pdf kpcbtsp101 specification for distribution transformer part 1pole mounted sigle phase oil type distribution transformer. Distribution system component failure rates and repair times. Formal order shall be issued prior to the date of delivery of the repaired transformers. It took me about an hour to disassemble the st84 transformerremoving about 36lams. Secondary low side service voltages are typically 120 volts, 208 volts, 240 volts. Distribution transformers 11 kv230 v and 11 kv central.
This is normally achieved by changing the ratios of the transformers on the system by altering the number of turns in one winding of the appropriate transformer s. Note the fused cutout and lighting arrestor combination external to the transformer. Highvoltage transformers are some of the most important and expensive. Transformer preventative maintenance involves routine inspection. Pdf impact of inspection strategy on repairing cost of distribution. Difference between power transformer and distribution transformer here we will discuss, the difference between power transformer and distribution transformer. A power transformer requires various routine maintenance tasks including measurement and testing of different parameters of the transformer.
Distribution system component failure rates and repair. Difference between power transformer and distribution transformer. Traction transformer repairs pdf reference case study etr500 high speed train. Maintenance of transformers a detailed checklist electrical4u. This program is aimed at training candidates for the job of a technician. The objective of this catalogue is to assist you in defining your needs and optimizing. In order to find the most efficient transformer, please see part transformer loss evaluation. Generator stepup transformers, used in reclamation powerplants, receive electrical energy at generator voltage and increase it to a higher voltage for transmission lines. The difference is categorized on the factors like the type of network used, location of installation, usage either for low voltages or high voltages. Perform the following tests on distribution and power transformers in accordance with iec 60076 and ansi ieee c57. Locomotive traction transformer repair english pdf reference case study. Distribution transformers are normally considered to be those transformers which provide the transformation from 11 kv and lower voltages down to the level of the final distribution network.
A distribution transformer or service transformer is a transformer that provides the final voltage transformation in the electric power distribution system, stepping down the voltage used in the distribution lines to the level used by the customer. That is, the highest failure rates are in the first few years. For correct installation, the following should be observed. Transformer design drytype and cast resin, protection methods are being referred and more also included in the specific research document. Selection guide abbs liquid filled power distribution transformers range from 16 kva upwards, with primary voltages up to 72. To make a new design just input basic parameters like kva rating of transformer, hthv voltage of transformer, ltlv voltage of transformer, impedance of transformer, load losses of transformer, no load losses of transformer, flux density of transformer and leave rest upon the software to take default values like various clearances, conductor insulation, lv turns, hv turns.
The main difference between power and distribution transformer is distribution transformer is designed for maximum efficiency at 60% to 70% load as normally doesnt operate at full load all the time. Distribution transformers ranging from 315 kva to 5 mva are readily distributed across the distribution networks, forming an integral part of the overall distribution network. Transformer fuse operations are the most common equipment failure on distribution systems, comprising as much as 40% in one study 4. In the uk this was, until january 1995, 415 v threephase and 240 v phase to neutral.
Distribution transformer failures follow a bathtub curve. Also information about some types of transformers are gathered as well as distribution transformer connections installations. The fuses listed in the next few pages are intended for use under oil in distribution equipment. That is, the highest failure rates are in the first few years of service and then decline. A tap changer is a device fitted to power transformers for regulation of the output voltage to required levels.
Existing transformer was adequately sized for new generation. The transformer shall be capable of withstanding the thermal and dynamic. About the coil when you are finished with the lams, you will have the bare transformer coil, as seen at left. Unlike any other transformer, our distribution transformers in india have brought in enormous response from clients who have used them in various industries, for they work extremely well in efficiently stepping down the voltage that flows through distribution lines to the level that is balanced and required. The repaired transformer should be despatched only after the inspection is conducted and. There are two main types of maintenance of transformer. For load losses the listings d and e, for noload losses the listings d and e were specified. Explain and interpret information found on transformer name plates. The distribution transformer is used to bring down or step down the voltage and current level of a transmission line to a predefined level, which is called safety level for the enduser consumer in domestic and industrial purpose.
Mar 07, 2016 a tap changer is a device fitted to power transformers for regulation of the output voltage to required levels. With power or distribution transformers, polarity is important only if the need arises to. Describe how to troubleshoot a transformer fault in which the rise pole fuse is blown, but the transformer primary fuse is intact. Distribution transformer repairs workshop repairs repairs abb. Earthing of distribution transformer earthing of transformer is an important aspect of distribution transformer installation.
This course uses uptodate test equipment and procedures for evaluating the condition of a. Basics, maintenance, and diagnostics vii contents continued page 4. The major activities in the implementation of the project has been listed and the average time for implementation of the project is estimated at 12 months. Elsco is the best in the industry for transformer repair. Nov 17, 2019 a power transformer requires various routine maintenance tasks including measurement and testing of different parameters of the transformer. Wellillustrated, this reference helps everyone install and maintain transformers correctly, quickly, an. Power transformers are among the most important components of electrical energy supply networks. Tender for the provision of distribution transformer. There are several types of transformer used in the distribution system. Generator stepup autotransformer stepdown pads transformer transformer 11510 or. Htlt powerdistribution transformer design software. Unlike motors and generators, transformers are nearly 100% efficient, operate continuously with no maintenance, and have no moving parts. Conversely, a stepdown transformer receives energy at a higher voltage and delivers it at a lower voltage for distribution to various loads.
Transformers convert electric power, to magnetic flux, to electric power in a new form. Distribution transformerthe step down transformers used for electric power distribution purpose are referred as distribution transformer. To achive this, about 78500 mw of generation capacity and matching transmission and distribution systems are to be added during 11th plan. When it comes to repairing, reconditioning, or retrofitting a transformer, there is no standard way of ensuring a quality end result. This is normally achieved by changing the ratios of the transformers on the system by altering the number of turns in one winding of the appropriate transformers. Supply authorities are under obligation to their customers to maintain the supply voltage between certain limits.
The routine inspection of transformer should be done pssn3006 a weekly b every six months c every three years. Single phase pole mounted distribution transformer ermco single phase pole mounted distribution transformers are designed and manufactured in compliance with all applicable ieee and rus standards. Describe the layout of a typical underground residential distribution urd system. Upon receipt of the transformer in the factory for repair, a visual and electrical. Because troubleshooting and repair require understanding how the system works.
Pdf power system consists of a number of transformers at substations including poll mounted distribution transformers whose numbers are in thousands find, read and cite all the. If the transformer is shipped and stored in dry inert gas, the gas pressure. This course uses uptodate test equipment and procedures for evaluating the condition of a transformer. Transformers covered by this document are liquidfilled distribution or power transformers up to 10 mva and 69 kv, and drytype distribution and power transformers up to 5 mva and 25 kv. The repair of power and distribution transformers requires specialized knowledge, skills and equipment. In sub segment of insulation type segment, the major share was held with liquid immersed type transformer in 2015. Distribution transformers are shipped completely sealed.