3 PHASE POWER
ELECTRICITY DISTRIBUTION
4 Hour Classes - All $85.00 Each
2 Hour Classes - All $65 Each
Sample Course Descriptions
Three Phase Power Systems
The objective of this module is to present the basic principles of 3 phase electric power, including the characteristics of Wye and delta connections. The fundamentals of two winding and autotransformers are discussed, including various combinations of 3 phase transformer connections. Finally, bearing in mind the special applications of DC in power systems, the characteristics of DC circuits are introduced. After completion of this module and associated workbook, the participant should be able to understand and apply the following concepts in day-to-day work activities.
• The advantage of three phase electric power systems
• Sharing the common neutral
• Elimination of the neutral conductor with a balanced three-phase load
• The generator Wye connection and grounded neutral
• The Wye connection voltage and current relationships
• The delta connection, voltage and current relationships
• Expression for power in a three-phase circuit
• Fundamentals of voltage transformation
• Function of the iron core in the transformer
• Transformer voltage and current relationships
• Transformer energy losses
• Transformer single phase and three-phase construction
• Characteristics of the transformer delta-delta connection
• Characteristics of the transformer Wye-delta connection
• The function of transformer tap changers
• The function of the autotransformer
• The difference between DC and AC electric power
• The effect of inductance and capacitance in a DC circuit
• Battery discharge and re-charge
• The DC generator
• Half wave solid-state rectification
• Full wave solid-state rectification
• Typical applications of the solid state rectifier
Electrical Fundamentals, Three Phase Systems
CATEGORY:
Power Transmission
COURSE DESCRIPTION:
In this four lesson program on basic electrical fundamentals, we will be introducing and studying the general physics, that is the basic natural laws which govern the application in utilization of electricity. This material will serve as the solid foundation on which to build the more advanced concepts that are dealt with in our many other training programs.
LEARNING OBJECTIVES:
•Understand Generator Frequency and how to synchronize a generator to the system
•Learn about three phase generation and the three phase basics
•Understand a balanced operation system
•Review the different connection methods
•Covers line voltage in three phase systems and the four wire three phase system
•Learn the apparent, reactive and real power in three phase systems and understand the examples of each
TOPICS COVERED:
•Lesson 1: Generator Synchronism and Frequency
•Lesson 2: Three phase operation
•Lesson 3: Three phase connection
•Lesson 4: Power in three phase circuits
SEAT TIME:
This course has been approved for 1 hour.
TESTING:
Quizzes - All quizzes must be passed with a 100% to proceed forward to the next lesson.
Final Exam- Final Exam must be passed with a 70% to pass the course. The final exam can be taken three times if necessary.
Electricity Distribution
Electricity distribution is the final stage in the delivery of electricity to end users. An electricity distribution system's network carries electricity from the transmission system and delivers it to consumers. Typically, the network would include medium-voltage (less than 50 kV) power lines, substations and pole-mounted transformers, low-voltage (less than 1 kV) distribution wiring and sometimes meters.
The modern electricity distribution system begins as the primary circuit leaves the sub-station and ends as the secondary service enters the customer's meter socket. Electricity Distribution circuits serve many customers. The voltage used is appropriate for the shorter distance and varies from 2300 to about 35,000 volts depending on utility standard practice, distance, and load to be served. Electricity Distribution circuits are fed from a transformer located in an electrical substation, where the voltage is reduced from the high values used for power transmission.
Conductors for electricity distribution may be carried on overhead pole lines, or in densely-populated areas where they are buried underground. Urban and suburban electricity distribution is done with 3 phase power systems to serve both residential, commercial, and industrial loads. Electricity Distribution in rural areas may be only single-phase if it is not economic to install 3 phase power for relatively few and small customers.
Only large consumers are fed directly from electricity distribution voltages; most utility customers are connected to a transformer, which reduces the distribution voltage to the relatively low voltage used by lighting and interior wiring systems. The transformer may be pole-mounted or set on the ground in a protective enclosure. In rural areas a pole-mount transformer may serve only one customer, but in more built-up areas multiple customers may be connected. In very dense city areas, a secondary network may be formed with many transformers feeding into a common bus at the utilization voltage. Each customer has an "electrical service" or "service drop" connection and a meter for billing. (Some very small loads, such as yard lights, may be too small to meter and so are charged only a monthly rate.)
A ground connection to local earth is normally provided for the customer's system as well as for the equiment owned by the utility. The purpose of connecting the customer's system to ground is to limit the voltage that may develop if high voltage conductors fall on the lower-voltage conductors, or if a failure occurs within a distribution transformer. If all conductive objects are bonded to the same earth grounding system, the risk of electric shock is minimized. However, multiple connections between the utility ground and customer ground can lead to stray voltage problems; customer piping, swimming pools or other equimpent may develop objectionable voltages. These problems may be difficult to resolve since they often originate from places other than the customer's premises.
3 phase power, electricity distribution, three phase power
Three Phase Electric Power
3 phase electric power is a common method of alternating current electric power generation, transmission, and distribution. It is a type of polyphase system and is the most common method used by grids worldwide to transfer power. It is also used to power large motors and other heavy loads. A 3 phase system is generally more economical than others because it uses less conductor material to transmit electric power than equivalent single-phase or two-phase systems at the same voltage.
In a 3 phase system, three circuit conductors carry three alternating currents (of the same frequency) which reach their instantaneous peak values at different times. Taking one conductor as the reference, the other two currents are delayed in time by one-third and two-thirds of one cycle of the electric current. This delay between phases has the effect of giving constant power transfer over each cycle of the current and also makes it possible to produce a rotating magnetic field in an electric motor.
3 phase systems may have a neutral wire. A neutral wire allows the 3 phase system to use a higher voltage while still supporting lower-voltage single-phase appliances. In high-voltage distribution situations, it is common not to have a neutral wire as the loads can simply be connected between phases (phase-phase connection).
Most power is distributed in the form of 3 phase A.C. Therefore you should understand what is meant by 3 phase power. Basically, power company generators produce electricity by rotating three coils or windings through a magnetic field within the generator .
3 phase electricity powers large industrial loads more efficiently than single-phase electricity. When single-phase electricity is needed, It is available between any two phases of a 3 phase system, or in some systems , between one of the phases and ground. By the use of three conductors a 3 phase system can provide 173% more power than the two conductors of a single-phase system. 3 phase power allows heavy duty industrial equipment to operate more smoothly and efficiently. 3 phase power can be transmitted over long distances with smaller conductor size.
3 Phase Power & Electricity Distribution
Three phase electric power is a common method of alternating current electric power generation, transmission, and electricity distribution. Sign up now to get all of your electricity distribution training online now!
3 phase power, electricity distribution, three phase power
