POWER TRANSFORMER SPECIFICATION ISSUES: GUIDE

POWER TRANSFORMER SPECIFICATION ISSUES: GUIDE

This presentation was originally made by the Electric Power Engineering Centre (EPECentre) at the University of Canterbury in Christchurch, New Zealand. The information found in this document is based on a power transformer specification workshop held in July 2007. The EPECentre takes no responsibility for damages or other liability whatsoever from the use of this document. This includes any consequential damages resulting from interpretation of material.

A detailed technical specification of a power transformer is an effective tool in keeping the relationship between a manufacturer and the buyer in harmony. On the Buyer's perspective, having a comprehensive specification for his desired power transformer will create an effective communication to the manufacturer on what he wants the contractor to deliver. Likewise, from a manufacturer'sperspective, through a clear power transformer technical specification, he can be able to provide satisfaction to the customer and he will be able to deliver the product accurately. This piece of document will prevent misunderstandings between a manufacturer and a buyer.

Three major topics are discussed in this document, first is the Fire & Explosion Protection, second is the Detailed Design Review, and Technical Specification Experiences. The Latter includes a list of all the needed information that a buyer should specify to his manfacturer.

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PARTS OF A POWER TRANSFORMER

What are the name of the basic parts of a Power Transformer? We can not deny the fact that only a handful of electrical engineering students are presently familiar with power transformers especially on what it looks like. Unlike a transformer we found in our homes, a power transformer’s appearance and construction is somewhat more complicated. It is not just a simple winding with a primary and secondary terminal although basically any transformer has one. The function that a power transformer plays in an electrical system is very important that an electric utility can not afford to loss it during its operation. Our discussion here will focus more on the basic parts and functions of a power transformer that are usually tangible whenever you go to a substation . Although not all power transformers are identical, nonetheless they all have the following listed parts in which the way of construction may differ.

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ELECTRIC MOTOR FRAME SIZE STANDARD SPECIFICATIONS

ELECTRIC MOTOR FRAME SIZE STANDARD SPECIFICATIONS How is electric motor frame size being specified? Motor frame dimensions have been standardized with a uniform frame size numbering system. This system was developed by NEMA and specific frame sizes have been assigned to standard motor ratings based on enclosure, horsepower and speed. The current standardized frames for integral horsepower induction motors ranges from 143T to 445T. These standards cover most motors in the range of one through two hundred horsepower. Typical example of where you can locate the frame is shown in Fig 1.2.D – Frame No. The numbers used to designate frame sizes have specific meanings based on the physical size of the motor. Some digits are related to the motor shaft height and the remaining digit or digits relate to the length of the motor. The rerate, or frame size reduction programs were brought about by advancements in motor technology relating mainly to higher temperature ratings of insulating mate

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ELECTRIC MOTOR NAMEPLATE SPECIFICATIONS

How do we interpret an electric motor nameplate? Motor standards are established on a country by country basis.Fortunately though, the standards can be grouped into two major categories: NEMA and IEC (and its derivatives). In North America, the National Electric Manufacturers Association (NEMA) sets motor standards, including what should go on the nameplate (NEMA Standard MG 1-10.40 "Nameplate Marking for Medium Single-Phase and Polyphase Induction Motors").

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