VOLTAGE REGULATORS IN DISTRIBUTION SYSTEM

VOLTAGE REGULATORS IN DISTRIBUTION SYSTEM

Voltage Regulators used in Power Distribution System?

Voltage regulators affect the system efficiency in two ways. First, by maintaining proper voltage on the feeders they serve, regulators reduce losses on lines and distribution transformers supplied by the regulated voltage. Second, losses occur on the regulators themselves. Depending on regulator design, loading, and mode of operation, these losses can be quite high.

Regulation at Substations

Two major decisions are involved in the choice of regulating equipment to be installed in distribution substations. First, the distributor must decide whether to provide separate regulation for each outgoing distribution feeder or whether some of the feeders will share regulating equipment. For modest-sized substations with only one substation transformer bank and three to five feeders, the decision may come down to the choice between regulating equipment for each feeder and a single, large regulating device serving all feeders. If the distributor decides to regulate all feeders as a group, providing only one regulator installation, it must make a second decision: whether to regulate by using a substation transformer load tap changer (LTC) or by using a separate regulating installation.

Types of Voltage Regulators

Shown below are the types of regulators used in distribution system each with its own purpose and function.

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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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