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Electrical theroy (Cables (important (Conductor (Aluminium (Advantages…

- - - - underwater
  - - - Aluminium
        
        Advantages
        
        corrosion defences
        
        non- manget
        
        Disadvantages
        
        High resistivity
      - Copper
        
        Advantages
        
        low reisitance
        
        easy bend
        
        easy joint
        
        corrosion defences
        
        Disadvantages
        
        unstable prices
        
        High density
    - - important
        
        lower Power Factor
        
        High dielectric
        
        Flexibility
- - - - 3-phase system
      - CB
    - - transfer
      - auxillary
      - Main power
  - - - feeder
      - plug-in
    - - less power lost
      - easy carry out upgrade
      - easy tap of power
    - - not easy bend
      - expensive
      - no iso build
- - - - Control switch
      - interrupting
      - interconnect Asccessories
    - - take out any time
      - Isolate and repair
      - auto isolate
      - prevent overvoltage
    - - Fuses
        
        open overcurrent
      - Isolators
        
        open when system dead
      - switch designed
        
        open like CB
    - - Fuses
      - Isolators
      - CB
- - - - Oil CB -OCB
        
        2 types
        
        small OCB
        
        bulk OCB
        
        high pressure restand
        
        interrupt on turbulent flow
        
        insulating
        
        insulates live parts
        
        Helps cool
        
        both comment
        
        oil use as medium
        
        replacement require
        
        comes spring charges
      - Vacuum CB VCB
        
        advantage
        
        no toxic
        
        no fire risk
        
        Fast and quiet
        
        long life
        
        maintenance free
        
        Disadvantage
        
        Vacuum needs a level
        
        cause voltage spike
      - Air CB -ACB
        
        advantages
        
        Easy maintains
        
        isolated form supply
        
        Easy check
        
        operation
        
        1 fault arc curry out
        
        2 arc carry by arc runner
        
        3 then exthinghs heat
      - SF6
        
        properties
        
        no carbon component
        
        5* heavier then air
        
        colorless odorless, non-toxic,non-flammble
        
        good di-electric
      - what Medium
        
        functions
        
        extinguish arc
        
        provide insulation
        
        Insulation
        
        types
        
        Gas (Sulphur Hexafloride)
        
        Vacuum
        
        oil
    - - MCCB
      - MCB
  - - - for medium CB
- - - - over load
      - short curits
- - - - Functions
        
        Real time monitor
        
        manage use
        
        provide use
    - - Functions
        
        Single control
        
        interconnected loads
- - - - description
        
        Ring + Raidenl
      - Disadvantages
        
        most complexs
        
        most ex
        
        super hard find fault
      - Advantages
        
        super fexable
        
        more then one power soruces
    - - description
        
        A cuits systems
      - Disadvantages
        
        more ex then raidenl
        
        hard bakc-up relay
        
        hard find fault then radial
      - Advantages
        
        flexable system
        
        one fualt can still work
        
        simple desgin
    - - description
        
        tree branch
      - Disadvantages
        
        one power source
        
        not flexible
        
        one fault can cut off the network
      - Advantages
        
        Cheapest
        
        easy trouble shoot
        
        easy desgin
        
        easy back-up relay