Máy điện và khí cụ điện

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TON DUC THANG UNIVERSITY
FACULTY OF ELECTRICAL AND
ELECTRONICS ENGINEERING
404130
ELECTRIC MACHINE AND
EQUIPEMNT
CHAPTER 4:
ELECTROMECHANICAL DEVICES
404130 - Chapter 4: ELECTROMECHANICAL DEVICES

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CONTENTS
4.1. Mechanical Operated Devices
4.2. Electromechanical Devices
4.3. Protection Devices
404130 - Chapter 4: ELECTROMECHANICAL DEVICES

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OBJECTIVES
 Know and remember the construction,
working principle applications of protect
devices
 Apply to calculate and determine protect
devices.
 Analysis operational characteristics of
protect devices
404130 - Chapter 4: ELECTROMECHANICAL DEVICES

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Concept
• A circuit breaker or isolation knife is a
manual shut-off CC used in a low-voltage
electrical network.
• Circuit breakers are very commonly used in
residential and industrial circuits in small
power ranges with small switching
frequency.
Disconnector
404130 - Chapter 4: ELECTROMECHANICAL DEVICES

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Concept
• Particularly, the load circuit breaker can
switch off the rated current, even if the
overload is small. This type can withstand
short-circuit currents but is not capable of
short-circuiting.
Disconnector
404130 - Chapter 4: ELECTROMECHANICAL DEVICES

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Classification :
It is possible to classify circuit breakers in
different ways:
- According to the structure we have 1pole, 2
pole, 3pole.
- According to rated voltage: 250V, 500V.
- According to the rated current, there are
types: 10A, 15A, 20A, 25A, 30A, 60A, 75A,
100A, 150A, 200A, 350A, 600A, 1000A....
Disconnector
404130 - Chapter 4: ELECTROMECHANICAL DEVICES

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Classification :
• According to insulating materials: Porcelain
base, stone base, plastic.
• Under protection conditions: type with box
type without box.
• According to the requirements of use, there
are types: with protective fuses, types
without protective fuses.
• There are also single-way circuit breakers
and 2-way circuit breakers (island circuit
breakers).
Disconnector
404130 - Chapter 4: ELECTROMECHANICAL DEVICES

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Symbol:
Disconnector
404130 - Chapter 4: ELECTROMECHANICAL DEVICES
CC
CD
a b c d

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SPECIFICATIONS
Choose disconnector bases on 2 conditions:
• Ur-dis ≥ Uworking
• Ir-dis ≥ Ical
Ical: is the computational line of the electrical
network
Disconnector
404130 - Chapter 4: ELECTROMECHANICAL DEVICES

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A switch is a switchgear circuit with small
capacity, often used in lighting or control
circuits.
1. Common switches :
SWITCHES
404130 - Chapter 4: ELECTROMECHANICAL DEVICES
One way switch two ways switch

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2. Switching switches:
SWITCHES
404130 - Chapter 4: ELECTROMECHANICAL DEVICES
Switch-disconnectors

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3. Pushbutton:
SWITCHES
404130 - Chapter 4: ELECTROMECHANICAL DEVICES

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3. Pushbutton:
SWITCHES
404130 - Chapter 4: ELECTROMECHANICAL DEVICES

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4. Limit switch:
SWITCHES
404130 - Chapter 4: ELECTROMECHANICAL DEVICES

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A controller is an electric instrument used to
switch electrical circuits by rotating levers or
steering wheels, control directly or indirectly
remotely, perform complex circuit switches to
control, start, adjust speed, reverse rotation,
brake electricity, etc. electrical machines and
electrical appliances.
CONTROLLER
404130 - Chapter 4: ELECTROMECHANICAL DEVICES

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CONTROLLER
404130 - Chapter 4: ELECTROMECHANICAL DEVICES