Energy and Power
When electric current flows, work is done. Light, heat or motion is produced when this current flows. ENERGY is the work done (measured in watt-hours). One (1) kilowatt-hour of electric energy is equal to 1,000 watt-hours.
POWER is the rate at which energy is generated, transported or consumed (measured in watts, kilowatts, megawatts). Low power means there are fewer electrons per hour; high power means there are more electrons per hour.
Electric Power Grids
An electric grid is a network of synchronized power providers and consumers that are connected by transmission and distribution lines and operated by one or more control centers. When most people talk about the “power grid, “ they are referring to the transmission system for electricity. Electric Energy is easily transportable via integrated electric grids. After transportation or transmission, electric energy is converted into mechanical energy, thermal energy, chemical energy, etc.
The fact that electricity cannot be easily stored means that production must be fine-tuned to consumption levels on a short term basis. Electricity is generated as it is needed so supply must be balanced with demand at all times to ensure that there is power service for all grid users.
How does a substation work?
For power to be useful in a home or business, it comes off the transmission grid and is stepped from “transmission” to “distribution” occurs is in a power substation. A power substation typically does two or three things:
It has transformers that step transmission voltages (in the tens or hundreds of thousands of colts range) down to distribution voltages (typically less than 10,000 volts).
It has a “bus” that can split the distribution power off in multiple directions.
It often has circuit breakers and switches so that the substation can be disconnected from the transmission grid or separate distribution lines can be disconnected from the substation when necessary.
(SOURCE: NGCP’s TRANSMISSIONS July 2011 Issue
<<< Previous |