Motor Transformers and Distribution System

  1. Power Distribution Systems
    1. Power Generation and  Substations
    2. Transformers
    3. High Voltage Distribution system voltage to current ratios for power supplied.

      P = V X I = 100 V X 100 A = 10000 Watts
      P = V X I = 10000 V X 1 A = 10000 Watts

  2. Circuit Protection
    1. Plant and Home Distribution Panels
    2. Transformers control systems
      1. Turn ratio = Number of turns on the primary/ number of turns on the secondary
        = 900 /1800 =1/2 =1:2 turns ratio
      2. Primary Voltage = Secondary Voltage X Turn Ratio
      3. Secondary Voltage = Primary Voltage / Turn Ratio
      4. Primary current = Secondary  current / Turn Ratio
      5. Secondary Current = Primary current X Turn Ratio
    3. Transformer Power Rating
      1. Single Phase load kVA = (I X E) /1000
        Three Phase Load kVA = (I X E X SR 3)/  1.73 X Voltage
  3. Transformer Connections
    1. Single Phase
    2. Three Phase
    3. High Voltage and Low
  4. Circuit Protection
    1. Fuse protection D2L topic
  5. Conduit and wiring

Motor Control Devices

  1. Primary
    1. Contactors and starter.
    2. Connects the load to the line.
  2. Pilot
    1. Relays, sensors and all controls switches.
    2. Directs the operation of another device.
  3. Nema Enclosure types. Chart page 62
  4. Types of switches and use show examples of different switches.
  5. How to wire devices in to the control circuit.
  6. Sensors
    1. Proximity Sensors
      1. Inductive
      2. Capacitive
      3. Photoelectric
      4. Though-beam
    2. Temperature
      1. Thermocouple
      2. RTD
      3. Thermistor
    3. Velocity and position
      1. Tachometer
      2. Magnetic pickup
      3. Encoder
    4. Flow Measurement
      1. Turbine Flowmeters
      2. Target Flowmeters
      3. Magnetic Flowmeters
    5. Relays and Solenoids