AUXILIARY LOSSES IN POWER TRANSFORMER

AUXILIARY LOSSES IN POWER TRANSFORMER

Beside Load loss and No load loss, another type of loss concerning substation transformers and are usually applicable to power transformers that are rated 5000kVA and above is the auxiliary loss. Auxiliary loss is a type loss that represents the electrical load of the transformer auxiliaries. This are the one that are utilize to operate the cooling fans and pumps of the transformer as discussed in our Load Loss topic. Although some utilities disregard this due to the fact that it does not impact the system’s loss in comparison to the Load and No-load losses, still technically they are still considered as losses. On the other hand, some electric utilities installs meters to properly account the power used in operating its substation auxiliaries thus, this can no longer be considered as losses.

Cooling Fan for a Power Transformer

OTHER FORM TRANSFORMER LOSSES

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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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