This document summarizes a training presentation on electrical engineering topics. It discusses low voltage control panels, starting methods for induction motors including DOL, star-delta, and autotransformer starters. It also covers forward and reverse operation of induction motors using contactors, and describes voltage-operated and current-operated earth leakage circuit breakers. The conclusion is that the training provided practical knowledge of electrical equipment like motors and starters, and introduced earth leakage circuit breakers which protect against leakage current through earth.

1. –

2. Training
Presentation
BHUWNESH GUPTA
12EBKEE018
PRESENTED BY:-
ADITYA BIRLA TRAINING AND
RESEARCH centre
(BKBIET CAMPUS)

3. CONTENTS
 Electrical Engineering
 Low voltage control panel
 Starting methods of induction motor
 Forward and reverse operation of induction motor
 Earth leakage circuit breaker (ELCB)
 Voltage operated ELCB
 Current operated ELCB
 Result
 Conclusion

4. ELECTRICAL
ENGINEERING

5. POWER ENGINEERING
Deals with the generation, transmission and distribution of
electricity as well as the design of related devices.
These include -
Transformer
Electric generator
Electric motor
Power electronics
CONTROL ENGINEERING
Control engineering is also known as control system engineering.
Control engineering is the engineering discipline that
applies control theory to design systems with desired behaviours.

6. INSTRUMENTATION ENGINEERING
Instrument engineering deals with the design of devices to measure physical
quantities such as pressure , flow and temperature.
Instrumentation engineering is often viewed as the counterpart of control engineering.
TELECOMMUNICATION ENGINEERING
Telecommunication engineering focuses on the transmission of information across
a channel such as a coax cable, optical fibre or free space.

7. LOW VOLTAGE
CONTROL PANEL
Low voltage control panel has two circuit :-
 Power circuit
 Control circuit
In control circuit contain start, stop push button, auxiliary contact, no volt coil and
tripping contact.
APPLICATION OF CONTROL PANEL
 Starting of motor
 Interlocking of motors
 Automation of motor

8. LOW VOLTAGE
CONTROL PANEL
1. HRC fuse
2. Air break contactor
3. No volt coil
4. Start button
5. Stop button
6. Overload
7. Tripping contact
8. Auxiliary contact

9. FORWARD AND REVERSE OPERATION OF
INDUCTION MOTOR
To change the direction of three phase induction motor rotation, two of its phases
needs to be interchanged, thus changing the phase sequence form, say RYB to
RBY.
This can be accomplished by using two contactors, one for the forward rotation or
clockwise rotation and one for the reverse rotation or anti clockwise rotation .
These contactors operated by no volt coils.

10. C
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11. STARTING METHODS OF
INDUCTION MOTOR
NECESSITY OF STARTING METHOD OF INDUCTION MOTOR
In induction motor, starting current is very large. From these, winding may be
damage. For protection from large starting current, we can use different methods
of starting. With the help of these starting methods, we can limit starting voltage
and starting current.
DIFFERENT STARTING METHODS OF MOTOR
1. DOL starter
2. Star delta starter
3. Autotransformer starter
4. Resistance starter

12. DIRECT ON LINE
STARTER
 up to 5 KW rating may be
used.
 Avoid supply voltage
fluctuation
 under voltage protection
Overload protection

13. STAR DELTA
STARTER
 Common and extensively
used
 Used for cage motor
 Star delta starting reduce
the starting torque to one
third that direct delta starting

14. AUTO TRANSFORMER
STARTER
 Suitable for star and delta
connected motor
 Reduce initial applied
voltage so starting current is
limited
 Overload protection using
overload relay

15. RESISTANCE
STARTER
 External resistance
connects in rotor through slip
ring
 Used for wound induction
motor
 Large starting torque, low
starting current

16. EARTH LEAKAGE CIRCUIT
BREAKER
An earth leakage circuit breaker (ELCB) is a safety device used in electrical
installations with high earth impedance to prevent shock. It detects small stray
voltages on the metal enclosures of electrical equipments.
The main purpose of earth leakage protectors is to prevent injury to humans and
animals due to electric shock.
There are two types of ELCB:
 Voltage operated
 Current operated

17. Voltage operated ELCB
Voltage-ELCB is a voltage operated circuit breaker. The device will
function when the Current passes through the ELCB.
ELCB is working based on Earth leakage current.
single phase voltage - ELCB will have six terminals:-
Line in Neutral out
Earth Fault
Line out Neutral in

18. CURRENT OPERATED
ELCB
It is also known as residual current circuit breaker (RCCB).
It is an electrical wiring device that disconnects a circuit whenever it
detects that the electric current is not balanced between the energized
(line) conductor(s) and the return (neutral) conductor. The device
detects the imbalance and trips the contact.
In RCCB construction a balanced core transformer, sensitive relay
mainly used.
LIMITATION
RCDs don’t offer protection against current overloads
RCD will not protect against the overheating

19. APPLICATION OF EARTH
LEAKAGE CIRCUIT BREAKER
 Where Emergency or temporary wiring is installed, such as flood lightning,
traffic signal
 In underwater lightning system for swimming pool use
 Where heating elements are installed in ground
 In medical equipments

20. RESULT
We learn about various starting method of three phase induction motor and low
voltage control panel & its components. We also study about ELCB, types of
ELCB, forward and reverse operation of three phase induction motor. We have
also learnt facts about electrical engineering.

21. CONCLUSION
In this training we get practical or industrial knowledge about some electrical
equipment like three phase induction motor, auto transformer etc. We also
understand concept of starter in three phase system i.e. starter is not only used for
limiting current but also provide protection of whole system which is connected
throw that starter. We learn a newly electrical equipment i.e. ELCB (Earth
Leakage Circuit Breaker). It is protects from leakage current throw earth.