Electrical distribution systems Text books 1Electrical distribution systems

Electrical distribution systems Text books: 1)Electrical distribution systems by turan gonen, 2) electrical power distribution by A. S Pabla. Presented by J RAVINDRANADH M-tech (power systems Electrical engineer (seimens) )

Transmission system Power plant Distribution system Generator GT 220 KV Distribution Step down transformer 10. 6 KV

This subject deals with 1) GENERAL CONCEPTS. 2) DISTRIBUTION FEEDERS. 3) SUBSTATIONS. 4) SYSTEM ANALYSIS. 5) PROTECTION. 6) COORDINATION. 7) COMPENSATION FOR POWER FACTOR IMPROVEMENT. 8) VOLTAGE CONTROL.

1) GENERAL CONCEPTS. q Load modelling and characteristics. q Coincidence factor. q contribution factor. q loss factor - Relationship between the load factor and loss factor. q Coincidence factor. q Classification of loads (Residential, commercial, Agricultural and Industrial) and their characteristics.

DISTRIBUTION FEEDERS q Design q voltage Considerations levels. q feeder loading. q basic design practice of the secondary distribution system.

SUBSTATIONS q Benefits derived through optimal location of substations q Rating of distribution substation

SYSTEM ANALYSIS q Voltage drop and power-loss calculations q Derivation for voltage drop and power in lines loss q Manual methods of solution for radial networks. q Three phase balanced primary lines.

PROTECTION Objectives q Distribution system protection. q Types of common faults and procedure for calculations. q Protective Devices q Principle of operation of Fuses. q Circuit Reclosures. q line sectionalizes. q Circuit breakers. fault

COORDINATION q q Coordination of Protective Devices. General coordination procedure.

COMPENSATION FOR POWER FACTOR IMPROVEMENT q q Power factor correction. capacitor allocation - Economic justification Procedure to determine the best capacitor location. Capacitive compensation for power-factor control. Different types of power capacitors. q shunt and series capacitors. q effect of shunt capacitors (Fixed and switched)

Contd. . q Power factor correction, capacitor allocation Economic justification - Procedure to determine the best capacitor location.

Voltage Control q Equipment for voltage control. q Effect of series capacitors. q Effect of AVB/AVR. q line drop compensation

Objectives q To improve performance. q Design and Planning. q Better Operation and maintenance. q To reduce transmission losses. q To improve system efficiency. q Improve quality of power to customer. q Load modelling, better load dispatch q Load growth calculation in service areas q load forecasting. q Automation development. q Protection of whole system etc…

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