For distribution transformer set up in buildings or steel sheet substations this means that there must be a regular supply of fresh air from outside, that there is adequate ventilation and enough free space above the transformer. Distribution transformers from schneider electric are available in ratings from 200kva upto 4000kva at voltages upto 36kv. Receiving, handling, and storage 3 21 receiving immediately upon receipt of the equipment, and before putting it into service, inspect the transformer for any damage that may have occurred during shipment or storage. Distribution transformers shall be in accordance withapplicable parts of c57 ieee and westerns requirements which include limits on percent impedance voltage ratings. 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. Distribution transformers can be shipped complete in standard shipping container. Jun 27, 2018 this webinar will introduce field technicians to the fundamental standards for transformer maintenance and testing. 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. Abb offers a complete range of distribution transformers designed to grant the reliability, durability, and efficiency required in utility, industrial, and commercial applications. Distribution transformer instruction manual energy power systems. Instructions for oilimmersed distribution t ransformer s. Distribution transformers analysis and maintenance practices eep. Drytype transformer maintenance checklist napces blog.
Power transformer maintenance and acceptance testing. The free flow of air is important as is the air temperature. A free powerpoint ppt presentation displayed as a flash slide show on id. Basic maintenance procedures if a transformer is to give long and trouble free service, it should receive a reasonable amount of necessary maintenance as a guide, following the cigre guide for transformer maintenance, published in 2011, alternative methods given. With predictive devices currently available, it is incumbent upon. Once predicted, such transformers may be subject to maintenance or replacement. Operation, and maintenance of drytype distribution transformers. Students learn instruction to install, maintain, repair or troubleshoot power transformers rated 765 kv or less.
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. Distribution transformer testing power partners usa. The purpose of this maintenance manual is to provide guidance on required and recommended. Distribution transformer handbook t h i r d e d i t i o n distribution transformer handbook additional publications alexander publications offers a variety of books, manuals, and software for electric utilities. In the uk this was, until january 1995, 415 v threephase and 240 v phase to neutral. Nov 17, 2019 a power transformer requires various routine maintenance tasks including measurement and testing of different parameters of the transformer. The invention of a practical efficient transformer made ac power distribution feasible. Distribution transformers analysis and maintenance practices.
Oil type distribution transformers our oil type distribution transformers offer a costeffective solution for your network. The transformer inspection checklist below covers important checkpoints for routine maintenance. With an understanding of the construction and maintenance of transformers, you will be able to make informed decisions about the performance and operation of this costly piece of equipment. Extracts from the abb switchgear manual are quoted by kind approval by the issuer.
Information about fist transformers,general transformer design drytype and cast resin, protection methods are being referred and more also included in the specific research document. Participants will receive instruction on the filtering and drying out process to be performed on transformers. Jun 05, 2016 the power transformer cooling system is critical to good transformer health. Underground distribution circuit maintenance 161 riser pole maintenance 162 switchgear maintenance 162 distribution transformer maintenance 162. Purpose this document is to provide guidance to bureau of reclamation reclamation powerplant personnel in maintenance, diagnostics, and testing of transformers and associated. Distribution transformers are normally considered to be those transformers which provide the transformation from. Insulation resistance of the ct has to be checked on an annual basis. Oil distribution transformers more than 70 years of knowhow and experience is reflected in the oil distribution transformers made by sgbsmit group. Selection guide abbs liquid filled power distribution transformers range from 16 kva upwards, with primary voltages up to 72. The transformer is usually small in size and filled with insulating oil. 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. There are two main types of maintenance of transformer.
Only equipment of current manufacture shall be furnished. Consult transformer manufacturers or test equipment manufacturers data for additional information. This five days course features the theory, operation, and maintenance associated with power transformers. A distribution transformer is a step down transformer primarily used for electric power distribution. If the heat inside of a transformer is not properly dissipated, the temperature of that transformer will rise continually, which will damage the insulation over time. A power transformer requires various routine maintenance tasks including measurement and testing of different parameters of the transformer. The step down electric power is then used for industrial and individual purposes. The time based maintenance is carried out at predetermined intervals of time or on the base of prescribed criteria and aimed at reducing the probability of. Distribution transformers maintenance guide for liquid. Abb supplies the widest range of power distribution transformers, including specific designs for power centres, substations, networks and padmounts. We perform one group on a routine basis known as preventative maintenance, and the second group on an adhoc basis i. Distribution transformers analysis and maintenance. Maintenance shall consist of regular inspection, testing and recondinoning, where necessary.
In addition to that following useful data is also included to help the customer to operate the transformer trouble free. Predictive maintenance is the complement of preventive maintenance. Maintenance of transformers a detailed checklist electrical4u. Distribution automation handbook prototype elements of power d istribution systems 1mrs757959 4 3 elements of power distribution systems 3. Careful attention to the following instructions is recommended for safe and reliable operation. Drytype transformers are manufactured to provide optimum performance for a lifetime of uninterrupted service. Siemens in industrial installations, transformers are mainly used to step down a higher distribution level voltage to a lower utilization level. The transformer is one of the most reliable pieces of electrical distribution equipment. 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. Whether it is for managing a rural network, or for simply improving your energy efficiency, we have the perfect solution for any distribution transformer application. Pdf distribution transformer handbook oscar mayorquin. They can be supplied in many types and styles, with standard industry fittings or bespoke design to the customers specific requirements. Department of energys federal energy management program femp. Facilities instructions, standards, and techniques.
Because drytype transformers are used so extensively in industrial, commercial, and institutional power distribution systems, their maintenance should be a. For an extended life and optimal performance of your drytype transformer, maintenance activities are highly recommended on a periodic basis. Transformer book is still in demand is a tribute to the publishers and to the. The preventive maintenance involves schedule maintenance and. The mission of femp is to facilitate the federal governments implementation of sound, cost. The vast majority are free breathing oil filled to bs 148, but they may be hermetically sealed oilfilled, dry type. A transformer must be mounted so that air can freely circulate all around and through it. The training course begins with a brief overview of how power and distribution transformers are constructed along with their major components, and then provides detailed information on the maintenance of these transformers, including testing, analysis of test results and troubleshooting. The transformer must be deenergized before this procedure, unless it. The amount of attention and maintenance vary with the service conditions and load cycle ofthe transformers, 3. A transformer operating at just 10c above its rating will reduce its life by 50%. Basics, maintenance, and diagnostics vii contents continued page 4.
Padmounted distribution transformers from eaton s cooper power series are designed for installation on singlephase underground systems. Data driven predictive maintenance of distribution. 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. That is, a method of predicting which transformers are most likely to fail soon. This manual contains important information on transformer equipment, handling. Oil type distribution transformers schneider electric. Distribution transformer handbook is packed with practical information on transformer concepts, singlephase and threephase transformer connections, and procedures for installing overhead and padmount transformers. This course uses uptodate test equipment and procedures for evaluating the condition of a transformer. Transformer windings are formed with precision around a large spool, with each number of turns dependent on the voltage ratio of the transformer being constructed. Maintenance guide for liquid filled distribution transformers. There are multiple types of distribution transformers used such as. Types and construction of power and distribution transformers. Instructions for oilimmersed distribution t ransformer s section d. It is therefore most vital asset in any electrical distribution network and needs special attention right from erection, commissioning and maintenance of these transformers.
It is also important to keep combustible material away from electrical distribution systems. Large format irwxpx rectangular windows mean that a single unit can be used for the lv connections and another for the hv connections on a transformer. All units are constructed for weather exposed mounting on a concrete pad with high and low voltage cables entering the operating compartment through an opening in the pad. Maintenance can either be time based or condition based, depending on the service strategy selected. Austin energys substation maintenance power transformer hot oil processing and vacuum filling. Installation, operation, and maintenance guide low voltage transformers 4 performing the modifications will be solely liable. Distribution transformers analysis and maintenance practices photo. Wellillustrated, this reference helps everyone install and maintain transformers correctly, quickly, an. Introduction this presentation is made by waseem haider under the guidance of pro. The vast majority are free breathing oilfilled to bs 148, but they may be hermetically sealed. Dawn of the digital distribution transformer english pdf article txpert animated video english mp4 movie txpert digital distribution transformer with deia bayoumi english mp4 movie abb amorphous transformers create significant savings for european electrical grid english, polish mp4. Allow for a cooldown period before servicing equipment. The design allows easy access for installation and maintenance of the.
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. Power transformer maintenance and acceptance testing on photo. Check colour of active agent if silicagel is pink, change by new charge. If a transformer is to give long and troublefree service, it. Through the utilization of various nondestructive testing and measuring techniques, predictive maintenance determines equipment status before a breakdown occurs. Distribution transformers are shipped completely sealed. If the storage time exceeds 2 weeks then the breather must be. Transformer installation, operation, and maintenance manual.
Our production in germany and malaysia is based on highquality production materials, and we place the highest emphasis on firstclass workmanship. Hermetically sealed distribution transformers are basically maintenance free. Distribution transformers are shipped ready for installation, which means they. Topics included are transformer theory, oil testing, gas analysis, electrical testing, receipt inspections and testing, load tap changers, and preventive maintenance.