IEEE STD 62-1995: GUIDE FOR DIAGNOSTIC FIELD TESTING OF ELECTRIC POWER APPARATUS-PART 1: OIL FILLED POWER TRANSFORMERS, REGULATORS, AND REACTORS

IEEE STD 62-1995: GUIDE FOR DIAGNOSTIC FIELD TESTING OF ELECTRIC POWER APPARATUS-PART 1: OIL FILLED POWER TRANSFORMERS, REGULATORS, AND REACTORS

Majority of the power transformers used by electric utilities are oil-filled including regulators and reactors. Since it is important to have these power apparatus in their top performance, it is therefore imperative to keep its reliability and useful life to the maximum. The early detection of possible defects is very important in this nature of operation. One way of keeping this requirement met is through regular diagnostic evaluation. By testing and measurements, maintenance engineers can be able to know the present condition of these electrical apparatus. However, in order for them to have a reference point they should first establish a benchmark values that future results could be compared to. With these values a clear evaluation can be obtained and to know how the apparatus is doing. Usually this benchmark value is from the first measurements like during factory testing or commissioning testing.

IEEE STD 62-1995 aims to guide practitioners and users in dealing with their oil-filled power apparatus with regards to diagnostic field testing and interpretations. The figure below shows the summary of the tests as referred to by this standard as the Diagnostic Test Chart. This chart is a representation of the network of test corresponding to the principle categories of systems that constitute the transformer (e.g. windings, bushings, insulating fluids, tap changers, core, tanks and associated devices).

To read the whole IEEE standard document, click the link below to download the pdf file.

IEEE STD 62-1995: GUIDE FOR DIAGNOSTIC FIELD TESTING OF ELECTRIC POWER APPARATUS-PART 1: OIL FILLED POWER TRANSFORMERS, REGULATORS, AND REACTORS PDF DOWNLOAD

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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 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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DISADVANTAGES OF Y-Y CONNECTION IN THREE PHASE SYSTEM

What are the disadvantages in using y-y connection? The Y-Y transformer connection was poorly understood in the early days of power engineering and it received a very bad reputation when it was first used; in fact, this connection was avoided for a long time until its limitations were overcome by good engineering practice. Some of the inherent disadvantages of the Y-Y connection are discussed below:

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power systems loss

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