ELECTRICAL TECHNOLOGY

Electricity is not a fun but easy to learn.

Prepared by,Mr. Vijay Balu Raskar

CHAPTER NUMBER NAME OF CHAPTER (Polytechnic)

1 D.C. CIRCUITS

2 A.C. FUNDAMENTALS

3 SINGLE PHASE AC CIRCUITS

4 THREE PHASE AC CIRCUITS

5 SINGLE PHASE TRANSFORMERS

6 D.C.MOTORS

7 FRACTIONAL HORSE POWER MOTORS

8 INSTALLATIONS,EARTHING AND TROUBLE SHOOTING

9 DIFFERENT TYPES OF MOTORS

PROTECTION Fuse

HRC-FuseMCB

MCCBELCB

FUSE•There are two types. 1. Rewirable / semi-enclosed type 2. HRC type fuse

HRC FUSE

Operation of Circuit Breaker

(See the Circuit Diagram on Black Board)

Rating of MCBUp to 100A

Braking Capacity:- 3KARating of MCCB

Up to 1600ABraking capacity:- 85KA

Rating of ELCB30mA for Domestic

100mA for Industrial300mA for Higher Leakage

EARTHING 1.Plate Earthing2.Pipe Earthing

PLATE EARTHINGMaterial :- Any metalEarth Plate:- 60CM X 60CM X 3.18mmGalvanized Plate:- 90CM X 90CM X 6.35mm.With Layer of salt & coke (Alternate).Layer thickness will be 15CM in deep

PIPE EARTHINGGalvanized iron pipe is used.Diameter is not less than 38.1mm and 2m in length for ordinery soil and 2.75m for dry.At top funnel fill with salty water.

TROUBLE SHOOTINGIt is the process of detecting faults in the circuit.

Instruments:- Megger, Tester, Multimeters, test lamp etc.

THANKS YOU