2EE3102 - Electrical Power System-1

1.Introduction:

• Present-Day scenario, Single line diagram of power system, Main components of power system,
• Structure of a power system: bulk power grids and micro-grids.

2.Variable Load on Power System:

• Types of loads, Variable load, Load and load duration curves, Connected load, Maximum demand, Average load, Demand factor, Load factor, Diversity factor, plant use factor,
• Utilization factor, Selection of generating units, Base load and peak load plant, Methods of meeting the load.

3.Supply System:

• Various systems of power transmission, Comparison of D.C. and A.C. transmission,
• Advantages of high transmission voltage, Derivation for volume of conductor materials used for three phase three wire and three phase four wire system,
• Requirements of satisfactory electric supply.

4.Economics of Power Generation and Transmission:

• Economics of generation, Cost of electrical energy, Expressions for cost of electrical energy,
• Methods of determining depreciation, Importance of high load factor, Economics of transmission,
• Economic choice of conductor size, Economic choice of transmission voltage.

5.Mechanical Aspects of Overhead Lines:

• Main components of overhead lines, Line supports, cross arms, Conductor materials, Types of insulators, Potential distribution over a string of suspension insulators, String efficiency,
• Methods of improvement of string efficiency, Calculation of sag and tension, Ice & wind effect on sag, Corona.

6.Transmission Line Constants:

• Resistance of line, Inductance of conductor due to internal and external flux, Inductance of 1-phase, two-wire line and composite conductor lines, self GMD, Mutual GMD, inductance of 3-phase line with equal and different spacing, With and without transposition, Double circuit line and bundled conductors,
• Capacitance of 1-phase and 3-phase transmission line with symmetrical and unsymmetrical spacing,
• Transposition, Skin effect, Proximity effect.