Skip to main content

LINE VOLTAGE REGULATORS CHARACTERISTICS AND OPERATION


LINE VOLTAGE REGULATORS CHARACTERISTICS AND OPERATION
Line voltage regulators' discussion and operation.

Primary distribution feeders in rural areas often extend so many miles that maintaining proper voltage over the entire length of the feeder will supply poit regulators alone is impossible. Line regulators located approximately at the mid-point of such feeder provide additional regulation to support the voltage on the remote parts of the feeder.

Characteristics of Line Regulators
The most common types of line regulators operate similarly to substation regulators. However, line regulators are usually smaller, are more likely to be formed from single-phase units, and are physically constructed for platform mounting on a pole or poles. The discussion above of loss characteristics of substation regulators also applies to line regulators. The major operational difference is that line regulators normally are used only for boosting voltage, and there is no way to center the operation around the neutral position.

Fixed Boosters
Another type of line regulator is a device that applies a fixed boost to line voltage (typically 5%) with no automatic tap position changes. Sometimes conventional distribution transformers are modified and connected in a special way to perform this function.

Staging Regulators
Voltage drop conditions are so severe on some long feeders that multiple stages of line regulators and/or fixed boosters are used. The necessity for more than one stage of line regulation should signal the distributor that it needs to consider upgrading the line conductors and configurations so adequate voltagecan be maintained. Losses occur within each regulator installation, and the need for many regulators indicates that line conductors are too small for prevailing load conditions and that line losses are excessive.

Operation and Maintenance of Regulators
To retain their best advantages for the system, voltage regulators need periodic attention. Since regulators having moving parts, regular preventive maintenance checks should be made at each installation. Also, changes in the load necessitate the adjustment of settings from time to time.

Finally, if distribution lines are upgraded so regulators are no longer necessary, the regulators should be removed to eliminate their continued losses.
Labels:

Comments

Post a Comment

Popular posts from this blog

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.
48 comments
click here to continue

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
5 comments
click here to continue

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").
40 comments
click here to continue