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Electrical Engineering > Module 3 > Flashcards

Module 3 Flashcards

1
Q

A network of conductors and equipment designed to carry, distribute and convert electrical power safely from the point of delivery or generation to the various loads around the building that consume tthe electrical energy

A

Electrical system

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2
Q

Basics of Electricity Distribution

A
  1. Earthing and bonding
  2. Electric Wiring
  3. Industrial installations
  4. Lighting controls
  5. Lighting sources, lamps, lighting design
  6. Telecommunication installations
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2
Q

Basics of Electrical Installations

A
  1. Lighting
  2. Exhaust fans
  3. Use of portable and non-portable electrical machines
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3
Q

Types of Electric Power Distribution System

A
  1. According to the nature of the supply
    »»AC Distribution System
    Primary Distribution System
    Secondary Distribution System

> > > > DC Distribution System

  1. According to a type of construction
     Overhead system
     Underground system
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3
Q

the power is distributed using two wires called Phase and neutral. The AC Power takes the shape of sinusoidal wave, the voltage peaks at 90 degrees during positive cycle and 270 during negative cycle

A

Single-Phase Power Supply

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4
Q

Types of Electrical System in the Philippines

A

Three-wire 120/240V Systems
»>supplied with 240-volt, alternating current, 60-cycle power using two wire service drop
»>two 120 V AC load wires and single neutral

Two-wire 240V Systems
»>one 240V AC load wire, one neutral wire

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5
Q

Design for household supplies and residential homes.
230V and 60HZ

A

Single phase connections

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6
Q

Consist of three power wires
Depending the the type of circuit (Star and Delta)
AC Power Signal is 120 degrees out of phase with each other.

A

Three-Phase Power Supply

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6
Q

Distribution Voltages

A

Primary: 4.16kV, 13.8, 34.5, 69
Secondary: 110/115V, 220/230V

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7
Q

A type of alternating current that is commonly used in power generation, transmission and distribution.

> > Preferable for high tension power loads and up to 415V

> > type of polyphase system that used high three-wires and most common used for electrical grids around the world to transfer power.

A

Three-phase electric power

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8
Q

Includes incoming power lines, an electric meter, a service panel, subpanels, household wiring, electrical boxes, receptacles (outlets), switches, and, of course, the appliances, lights, and equipment that put the power to work.

A

Home Electrical System

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8
Q

Types of Protective Devices

A
  1. Fure Wire or Fuse
  2. Miniature Circuit Breaker
  3. Earth Leakage Circuit Breaker
  4. Earthing or Grounding
  5. Ground-Fault Circuit Interrupter (GFCI)
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9
Q

A device used to protect equipment, machinery, components and devices, in electrical and electronic circuit, against short circuit, over current and earth fault

A

Protective Device

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10
Q

is a device that protects electrical systems against potentially dangerous power
surges and excessive temperatures.

A

Fuse

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11
Q

is a metal box that contains screw-in fuses and cartridge fuses.

A

Fuse boxes

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11
Q

Only one connecting plug, it can only break
one phase line, this switch is only suitable for controlling one-phase live wire.

A

1P - Single Pole

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11
Q

it can only break
one phase line, this switch is only suitable for controlling one-phase live wire.

A

1P - Single Pole

12
Q

three are connected to
the live wires and the remaining is connected to the zero line. This switch is suitable for
controlling three-phase four-wire system circuit.

A

4P - Four Pole 1P+N

12
Q

A circuit breaker is one kind of electrical switch used to guard an electrical circuit against
short circuit otherwise an overload which will cause by excess current supply.

A

Miniature Circuit Breaker (MCB)

12
Q

which are connected
to the live wires. This switch is suitable for controlling three-phase 380V circuit.

A

3P - Three Pole

13
Q

3P+N

A

Three pole switches with zero terminal

13
Q

one is connected to the
phase line and the other is connected to the zero line.

A

2P - Two Pole

14
Q

1P+N

A

Single pole switch with zero terminal

15
Q

protects against overload, and short
circuit faults and is also used for switching the circuits. It can be used for higher current
rating and fault levels in domestic applications.

A

Molded Case Circuit Breaker

15
Q

It is another type of electrical protection device that is used when the load current exceeds
the limit of a miniature circuit breaker.

A

Molded Case Circuit Breaker or Power Circuit Breaker

16
Q

can be used for
protection of capacitor banks, generator protection, and main electric feeder distribution.
It offers adequate protection whenever an application requires discrimination, adjustable
overload setting, or earth fault protection.

100A and higher up to 100 kA

A

Molded Case Circuit Breaker

17
Q

is a safety device that notices a problem in your home power supply and then turns OFF in 10-15
milliseconds to stop electric shock.

A

Residual Current Device

18
Q

three
types of RCDs based on the differential current they can handle.

A
  1. High-sensitivity residual current devices
  2. Medium-sensitivity residual current devices
  3. Low-sensitivity residual current devices
19
Q

one kind of safety device used for installing an electrical device with high
earth impedance to avoid shock. These devices identify small stray voltages of the
electrical device on the metal enclosures and intrude the circuit if a dangerous voltage is
identified.

A

Earth Leakage Circuit Breaker

20
Q

are generally installed where electrical circuits may accidentally come into contact
with water. They are most often found in kitchens, bath and laundry rooms, or even
out-of-doors or in the garage where electric power tools might be used.

A

Ground Fault Circuit Interrupter

20
Q

can help prevent electrocution. If a person’s
body starts to receive a shock, it senses this and cuts off the power before he/she
can get injured.

A

Grand Fault Circuit Interrupter

20
Q

is an integral part of any properly operating electrical system. In residence,
grounding protects the occupants by providing a safe pathway for unwanted electricity
that might otherwise create a hazard.

A

Grounding

21
Q

is used to provide a safe path for a fault current to flow

A

Grounding

21
Q

Grounding is usually done at two levels:

A

System grounding and Equipment grounding.

22
Q

is essentially a circuit designed to protect individual
components of an electrical system.

A

Equipment Grounding

22
Q

Aims of Grounding System

A
  • Limit the potential difference between metallic masses and ground.
  • Make sure the protection devices operate.
  • Eliminate or reduce the risk posed by a fault in the electrical equipment used
22
Q

two most popular methods used for grounding

A

electrode grounding
water pipe grounding

22
Q

is a special circuit designed to protect the entire distribution system
of a residence.

A

System Grounding

23
Q

is a long metal rod used for grounding that makes contact with the earth.

A

Electrode

24
Q

uses the underground metal pipe that supplies a residence with water and is typically the best electrical ground for a residential electrical system.

A

Water pipe ground

25
Q

are primarily in place to protect the outlet and surrounding area in case
of an overload or power surge. I

A

Grounding Wires

26
Q

is the most widely used alternative source of power in facilities today.
Its ability to provide continuous power as long as it has a supply of fuel makes it wellsuited for providing both long- and short-term backup power.

A

Diesel Generator

Electrical Engineering (1 decks)

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