Lecture 1 Flashcards
(31 cards)
What is the focus of Module I in the Electrical Services Design course?
Low Voltage (LV): Energy supply and distribution, types and choice of cables and conductors, wiring systems, protection of low-voltage installations, illumination design, etc.
What are the key aspects of Module II in the Electrical Services Design course?
Transformer substation design, street lighting design, solar installation design, software applications for services and installation design.
Which systems are covered in Module III of the Electrical Services Design course?
Auxiliary installation: Fire alarm system, CCTV system.
What are the two main categories of electricity generation methods?
- Conventional methods
- Non-conventional methods
What is the primary source of thermal energy in electricity generation?
Fossil fuels or nuclear energy used to produce steam for turbines.
How does hydroelectric power generation work?
Utilizes the potential of water stored at higher altitudes passed through water turbines.
What is a key advantage of wind power?
Zero production cost.
What are fuel cells known for in electricity generation?
Direct conversion of chemical energy into electrical energy, pollution-free and noise-free.
What do photovoltaic cells do?
Directly convert solar energy into electrical energy through the photovoltaic effect.
What is the difference between single-phase and three-phase power transmission?
Single-phase is limited to short distances and lower voltages; three-phase is used extensively for higher loads.
What are the types of distribution systems for AC power?
- Single-phase, 2-wire system
- Single-phase, 3-wire system
- Two-phase, 3-wire system
- Two-phase, 4-wire system
- Three-phase, 3-wire system
- Three-phase, 4-wire system
What is the difference between feeders and distributors in a distribution system?
Feeders have the same current loading throughout their length, while distributors have distributed loading with variations of current along its entire length.
What are the two types of distribution systems mentioned?
- Radial Distribution
- Ring Distribution
What is a disadvantage of the radial distribution system?
Consumers depend on one feeder only, with no absolute guarantee of continuous power supply.
List the advantages of using copper as a conductor material.
CH.DMW
- Cheaper comparatively
- High electrical conductivity
- Mechanically strong and tough
- Durable and ductile
- Withstands dampness and high temperature
What are the properties of insulating materials used in electric cables?
H(RFD)N(IH)
- High resistivity
- High flexibility
- High dielectric strength
- Non-inflammability
- Non-hygroscopic
What are the types of cables mentioned in the text?
- Vulcanized India Rubber (VIR) insulated cable
- Tough rubber cable sheathed (TRS)
- Lead sheathed cables
- Weatherproof cables
- Polyvinyl chloride (PVC)
- Flexible cords and cables
- XLPE cables
What are the advantages of PVC cables over other types?
TCN
- Non-hygroscopic insulation
- Non-migration of compound
- Complete protection against corrosion
- Tough and resilient sheath
- Good ageing characteristics
- Not affected by vibration
What benefits do XLPE cables provide?
Happy Horses Live longer
- Higher current rating
- Higher short-circuit current rating
- Longer service life
- Less sensitive to network protection settings
- Excellent mechanical features
Define a wiring system in electrical engineering.
A network of wires connecting various accessories for distribution of electrical energy to consuming devices.
What are the factors to consider when choosing a wiring system?
S-DAMPAIM
- Safety
- Durability
- Appearance
- Mechanical Protection
- Permanency
- Accessibility
- Initial cost
- Maintenance cost
What is the role of a fuse in an electrical circuit?
Interrupts the circuit under short circuit or excessive overload conditions.
What are the parts of a fuse?
- Fuse element or fuse wire
- Fuse link
What are the advantages of using fuses?
- Cheapest form of protection
- No maintenance needed
- Automatic operation
- Can interrupt high short circuit currents without noise
