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Switchyard reactor
For transmission lines, the space between overhead line and ground forms a capacitor parallel to transmission line, which causes an increase in voltage as the distance increases. When a network becomes larger, sometimes the short-circuit current on transmission line exceeds the short-circuit rating of the equipment. To offset the capacitive effect of the transmission line and to regulate the voltage and reactive power of the power system, reactors are connected either at line terminals or at the middle, thereby improving the voltage profile of transmission line.
A shunt reactor is connected in parallel with a transmission line or other load. A series reactor is connected between a load and source.
== Bus reactors ==
A bus reactor is a type of air core inductor, or in some cases, oil filled, connected between two buses or two sections of the same bus in order to limit the voltage transients on either bus. It is installed in a bus to maintain system voltage when the load of the bus changes. It adds inductance to the system to offset the capacitance of the line which varies due to load, humidity, weather, generator excitation and temperature.
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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