Motor Transformers and Distribution System
Power Distribution Systems
Power Generation and Substations
Transformers
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
Circuit Protection
Plant and Home Distribution Panels
Transformers control systems
Turn ratio = Number of turns on the primary/ number of turns on the secondary
= 900 /1800 =1/2 =1:2 turns ratio
Primary Voltage = Secondary Voltage X Turn Ratio
Secondary Voltage = Primary Voltage / Turn Ratio
Primary current = Secondary current / Turn Ratio
Secondary Current = Primary current X Turn Ratio
Transformer Power Rating
Single Phase load kVA = (I X E) /1000
Three Phase Load kVA = (I X E X SR 3)/ 1.73 X Voltage
Transformer Connections
Single Phase
Three Phase
High Voltage and Low
Circuit Protection
Fuse protection D2L topic
Conduit and wiring
Motor Control Devices
Primary
Contactors and starter.
Connects the load to the line.
Pilot
Relays, sensors and all controls switches.
Directs the operation of another device.
Nema Enclosure types. Chart page 62
Types of switches and use show examples of different switches.
How to wire devices in to the control circuit.
Sensors
Proximity Sensors
Inductive
Capacitive
Photoelectric
Though-beam
Temperature
Thermocouple
RTD
Thermistor
Velocity and position
Tachometer
Magnetic pickup
Encoder
Flow Measurement
Turbine Flowmeters
Target Flowmeters
Magnetic Flowmeters
Relays and Solenoids