CBCGS [2017 - current]

CBGS [2013 - 2016]

Old [2000 - 2012]

## Units and Topics

# | Unit/Topic | Marks |
---|---|---|

100 | Introduction | - |

200 | Transmission Line Parameters | - |

300 | Performance of Transmission Line | - |

400 | Overhead Transmission Line | - |

500 | Underground Cable | - |

600 | Grounding and Safety Techniques | - |

Total | - |

## Syllabus

100 Introduction

- Typical AC supply system, comparison between DC and AC supply system, choice of working voltage for transmission and distribution.

200 Transmission Line Parameters

201 Resistance

- Resistance, skin effect and proximity effect.

202 Inductance

- Definition of inductance, inductance of single phase two wire line, conductor types, bundled conductors. Inductance of composite conductor, single circuit three phase line, double circuit three phase line.

203 Capacitance

- Potential difference between two conductors of a group of parallel conductors, capacitance of a two wire line, three phase line with equilateral spacing, three phase line with unsymmetrical spacing earth effect on transmission line capacitance, bundled conductors, method of GMD.

300 Performance of Transmission Line

301 Representation of Power System Components

- Single phase solution of balanced three phase networks. One line diagram, impedance and reactance diagram. Per unit (p.u.) system, per unit impedance diagram, representation of loads.

302 Transmission Line Model

- Short, medium, and long line model. Equivalent circuit of a long line. Ferranti effect. Tuned power lines, surge impedance loading, power flow through transmission lines (Numerical compulsory).

400 Overhead Transmission Line

401 Mechanical Design of Transmission Line

- Components of overhead lines, types of towers- A type, B type, C type, D type and double circuit tower, cross arms, conductor configuration, spacing and clearance span lengths, sag and tension (Numerical compulsory).

402 Overhead Line Insulators

- Types of insulators. String efficiency, methods of equalizing potential (Numerical compulsory)

500 Underground Cable

- General construction, types of cable- PVC insulated, XLPE, Paper impregnated, mineral insulated, insulation resistance of single core cable, capacitance of single core cable, grading of cable, selection of cable.
- Comparison between overhead line transmission with underground cabling system

600 Grounding and Safety Techniques

- Measurement of earth resistance. Soil resistivity, tolerable limits of body currents, tolerable step and touch voltage, actual step and touch voltage, measurement of tower footing resistance, counterpoise methods of neutral grounding, grounding practices.

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