Electrical Systems week one
Card Set Information
Electrical Systems week one
Northwest Lineman College
ES week one test
what percent of today's systems are loop fed?
what are the 5 main elements of the electrical system?
generation voltage range
13.8KV to 24KV
Transmission voltage range
230KV to 765KV
sub transmission voltage range
44KV to 138KV
distribution substation voltage range
2.4KV to 34.5KV
what is the function of transmission lines?
allow power to be transmitted over long distances to switch yards and sub transmission substations
what is loss of power in transmission lines called
where do transmission lines begin and end?
generation, where the power will be used
4 common transmission voltages
230KV, 345KV, 500KV, 765KV
Transmission lines deliver _____ blocks of power?
blocks of power refer to?
are blocks of power set or undetermined?
what lines deliver power directly to the customer?
sub transmission lines deliver ______ blocks of power
what is the grid?
generation facilities and other trans lines connecting to form a network through North America and Canada.
what is the mission of the NERC?
to promote the reliability of electric supply system in North America and Canada
When do customer rates go up?
when companies buy power from other counsels.
what are the 3 pieces of equipment all substation have?
circuit bus to redirect power if needed
4 common sub transmission voltages
44KV, 69KV, 115KV, 138KV
distribution substations ______ voltage
where does distribution substations deliver power?
what voltages do customer transformers lower to?
distribution voltage ranges
2KV, to 34.5KV
substation distribution lines deliver power directly to?
commercial customer substation. which is the last place in the system where a voltage change can occur
where are substation distribution lines supplied from?
sub transmission lines
substation distribution lines may be installed where?
overhead or underground
distribution lines are the ______, customers are the ____.
what is the main advantage AC has over DC?
AC can be transformed, DC cannot
what is the standard for hertz in the US?
where is DC most common?
AC flow of electrical energy changes direction at a ______ ____.
DC flow of electrical energy stays at the ____ ____.
what's the 3 primary functions substations preform?
change voltage of circuits from on level to another
connect and disconnect lines of equipment from other
control the flow of power by adjusting the voltage and current
is the power that is produced by rotating a magnetic field near a conductor, as in a generator
is the unit of measure for the flow
of electrons, or
is a compilation of conductors and electrical
components that allow current to pass from a source to a load.
is any material that allows current to flow with essentially no resistance.
A pin-pointed location in the electrical
system in which there is a change in ownership.
is an excessive current flow in a circuit caused be damage
is the unit of measure for frequency.
is a non-conductive material that is used to isolate electrical energy from
is the unit of measure for 1,000 volts
is the unit of measure for the amount of power that can be delivered to a load.
is the term used to describe the point at
which the power is consumed
is the term used to describe the ability of one coil of conductor to induce
voltage into another coil.
is a conductor (typically for distribution)
that provides a ground reference for the load
is the unit of measure for the amount of
resistance in an electrical circuit.
a circuit that provides more than one path for current to flow
is a term that refers to voltage
is a conductor that supplies power to the load,
one path for current flow
point at which power is produced
is the point in an electrical system in which
voltage changes from one level to another
is the unit of measure for electrical pressure, or electromotive force
is the unit of measure for electrical power
North American Electric Reliability Council
common distribution operation voltages are
7.2KV/12.47KV, 7.62KV/13.2KV, 12KV/20.8KV, 14.4KV/24.5KV, 19.9KV/34.5KV
what distribution voltages are slowly being cut over to higher voltage
common service voltages
120v/240v, 120v/208v, 240v/480v, 277v/480v