# Elements of Electrical Design - [2150904]

#### Teaching Scheme

 Theory Tutorial Practical Total 2 0 2 4

#### Examination Scheme

 Theory Examination Practical Examination Total ESE (E) PA (M) ESE Viva (V) PA (I) 70 30 30 20 150

ESE = End Semester Examination, PA = Progressive Assessment

#### GENERAL DESIGN ASPECTS

Basic principles of magnetic circuits – use of B-H curves in magnetic circuit; Calculations of MMF for air gap and teeth; Real and apparent flux density; Field Form; Air gap flux distribution factor (field form factor); Magnetising current calculation; Leakage Reactance calculation for various types of slots, Iron loss calculation concepts; Insulating Materials & Classifications

#### DESIGN OF STARTERS AND FIELD REGULATORS:

Introduction and review of A.C. and D.C. starters; Schematic diagrams of control circuit and power circuit for starters with contactors and timers. Design of starters and Field regulators.

#### DESIGN OF SMALL TRANSFORMERS AND CHOKE COILS

Design of Small single-phase transformers; Design of variable air gap single phase and three phase choke coil; Design of ballast

#### Armature Windings: DC windings :

Simplex & Duplex windings; Lap & Wave windings; Applications; Basic terms related to armature windings; Dummy Coils; Equalizer connections; Split coils.

#### Armature Windings: AC windings :

Introduction; No. of phases; Phase spread; Concentric winding, Hemitropic winding; Whole coil winding; Mush winding; Double layer windings; Integral slot lap and wave winding; Fractional slot lap and wave windings; Performance analysis of various windings.

#### Estimation and Costing for Residential and Commercial wiring

Preparation of schematic diagrams and estimation of cost of wiring for Tenaments, Row houses, Bungalows, Flats, Multi – Storied Buildings, Commercial Complexes like Offices, Hospitals, Hotels, Theatres

#### Design consideration of Electrical Installation

Types of load, Electrical Supply Systems, Wiring systems, Load Assessment, Permissible voltage drops & Conductor size calculations, Design of Control panel. Estimation and costing for service connections.

#### Reference Books

SrTitleAuthorPublicationAmazon Link
1A course in electrical machine DesignA. K. Sawhney
2Electrical Machine DesignR. K. Agrawal
3Design of Electrical MachineV. N. Mittle

#### Course Outcome

After learning the course the students should be able to: -

• Explain the basic concepts related to design of electrical equipments
• Design the starters, field regulators, small transformers and choke coils
• Draw and explain the winding diagrams for AC and DC machines
• Estimate the cost of wirings.