Reactors Flashcards
The current in transmission and distribution lines can lead or lag the voltage.
True
When a transmission line has a large component of capacitive reactance, the ? .
current will lead the voltage
Any electrical circuit component that opposes changes in current is defined as a(n) ? .
inductor
A reactor connected in parallel and used to counter phase-to-ground capacitance is called a ? reactor.
shunt
A transient-limiting reactor limits outrush and inrush currents when capacitor banks are switched and is also called a(n) ? reactor.
damping
To reduce current ripple (harmonics) on the DC side of a converter substation, ? reactors are essential.
smoothing
When reactors are energized, they become an electric magnet with the strength being proportional to the ? and the number of turns in the coil.
amperage flowing
Reactors are custom designed and constructed for the amount of fault current available on-site and for the amount or reactance needed.
True
Most substation ? reactors look like substation transformers and are about the same size.
Shunt
Substation reactors are passive pieces of equipment and are normally not energized.
False
The largest reactors are used in HVDC systems and are called ? reactors.
Smoothing
Capacitive reactance on a system can be countered by the addition of inductive reactance. Inductive reactance causes the ? .
current to lag behind the voltage
When an extra-high voltage line is energized, its inherent capacitance causes an unacceptable voltage drop on the end of the line, especially if the line is lightly loaded.
False
In an extra-high-voltage line, the current leads the voltage by ? .
90 degrees
The reactance of a(n) ? reactor can be varied by the amount of superimposed flux applied to the core.
saturable-core
