EP1 (Diploma Electrical Engineering 5th)

1. Transmission Systems ( 20 hrs)

1.1 Layout of transmission system, selection of voltage for H.T and L.T

lines, advantages of high voltage for Transmission both AC and DC

1.2 Comparison of different system: AC versus DC for power

transmission, conductor material and sizes from standard tables

1.3 Constructional features of transmission lines: Types of supports,

types of insulators, Types of conductors, Selection of insulators,

conductors, earth wire and their accessories, Transposition of

conductors and string efficiency of suspension type insulators,

Bundle Conductors.

1.4 Mechanical features of line: Importance of sag, calculation of sag,

effects of wind and ice related problems; Indian electricity rules

pertaining to clearance

1.5 Electrical features of line: Calculation of resistance, inductance and

capacitance without derivation in a.c. transmission line, voltage

regulation, and concept of corona. Effects of corona and remedial

measures

2. Distribution System (12 hrs)

2.1 Lay out of HT and LT distribution system, constructional feature of

distribution lines and their erection. LT feeders and service mains;

Simple problems on AC radial distribution system, determination of

size of conductor

2.2 Preparation of estimates of HT and LT lines.

2.3 Constructional features of LT (400 V), HT (II kV) underground

cables, advantages and disadvantages of underground system with

respect to overhead system.

3. Substations: (12 hrs)

3.1 Brief idea about substations; out door grid sub-station 220/132 KV,

66/33 KV outdoor substations, pole mounted substations and indoor

substation 

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3.2 Layout of 33/11 kV/400V distribution substation and various

auxiliaries and equipment associated with it

4. Faults: (6 hrs)

Common type of faults in both overhead and underground systems,

symmetrical / unsymmetrical faults. Single line to ground fault, double line

to ground fault, 3-phase to ground fault open circuit.

5. Power Factor: (8 hrs)

 5.1 Concept of power factor

 5.2 Reasons and disadvantages of low power factor

5.3 Methods for improvement of power factor using capacitor banks,

VAR Static Compensator (SVC)

6. Various Types of Tariffs: (6 hrs)

6.1 Concept of Tariffs

 6.2 Block rate, flat rate, maximum demand and two part tariffs

6.3 Simple problems