electrical grid 1 test 3 Flashcards
main grid voltage ranges from?
765 KV - 230 KV
sub-transmission voltages ranges?
138 KV - 44 KV
what substation is the only substation that bumps the power up?
Generation substation
what is a static wire?
is a ground wire
what is a shield wire?
a ground wire with fiber optic core
how much do conductors weigh per foot?
2 - 1/2 lbs per foot
what diameter are the conductors used?
1 - 3/4 inches in diameter
a lattice type structure is used on what voltages?
345 KV lines and above
wooden pole structures are used on what voltages?
345 KV and below
two materials used on insulators today?
polymer and porcelain
what is a bundle?
more then one conductor per phase
what are used to change voltage from one to another?
power transformer
what does LTC stand for?
load tap changer
what does a Load Tap changer do?
to cut in or out a portion of the transformer winding which adjusts the voltage to the canditions
what is used to connect and disconnect lines and equipment?
circuit breakers
what is designed to interrupt large amounts of current and typically use oil, air, vacuum or sulfur hexafloride gas to accomplish the operation?
circuit breakers
what is used to change the voltage from one level to another and can contain large amounts of mineral oil?
power transformers
what is installed in substations in order to isolate lines and equipment to be worked on?
disconnect switches
what does P.T. stand for?
potential
P.T is?
reduction in voltage
what does C.T. stand for?
current
these devices are used to automatically adjust voltage as required.
voltage regulator
what provides a path for lightning strikes at substations?
ground grid
insulators support what?
conductors
what is the more aesthetically pleasing alternative to wooden poles?
tubular steel poles
