sub equipment overview Flashcards
The type of substation located near the end user is the ? substation.
distribution
A generating station will typically have a(n) ? substation located nearby.
step up transmission
A substation houses ? that protect the outgoing distribution feeders.
reclosers
A rural substation is normally more complex in construction than an urban substation.
false
Sulfur hexafluoride (SF6) is used as a(n) ? medium in substation switchgears.
arc quenching
In remote locations, the economics of building double-bank substations to provide system reliability is not always an option. ? substations can be used to provide backup.
mobile
Of the various types of arc-quenching mediums used in distribution circuit breakers, ? circuit breakers have been the most common.
oil
When substation equipment must be de-energized to perform maintenance, ? provide visible open points.
disconnect switches
Substation transformers are only equipped with off-load tap changers.
false
The pieces of equipment in a substation that are isolated from a ground by being mounted on insulators are ?
capacitors
In a substation, disconnect switches are in ? the circuit breakers.
series with
Typically, distribution substation feeders deliver power in voltages from ? , depending on the needs of the area being served.
2.4 kV to 34.5kV
Inductive reactance is sometimes needed to offset the capacitive reactance generated by long EHV transmission lines. This electrical property can be added to the system with ?
reactors
At the beginning of overhead DC lines, submarine DC lines, or short DC lines between two different systems, ? substations are built.
converter
Electrical transmission lines operate at high voltages to reduce the power loss. The formula used to calculate for the power loss on lines is ?
I^2R
Substations can be built in many types, but there are ? basic types.
3
Substation equipment can add capacitive or inductive reactance to the grid. To adjust the reactive power (VARS) up and down as needed, ? reactors are teamed up with capacitors.
static compensator
To reduce the high inrush of current when capacitor banks are switched into service, ? reactors are connected in series with the load.
damping
The word “substations” came into use because they were connected to only one power station and were subsidiaries of that power station.
true
A power line carrying 66 kilovolts is classified as being of sub-transmission voltage.
true
When powerline carrier communication (PLCC) systems are being used, ? are connected in series with the circuit.
wave traps
