What is the purpose of a shunt reactor?
A shunt reactor is an absorber of reactive power, thus increasing the energy efficiency of the system. It is the most compact device commonly used for reactive power compensation in long high-voltage transmission lines and in cable systems.
What is the purpose of a reactor in power system?
A reactor, also known as a line reactor, is a coil wired in series between two points in a power system to minimize inrush current, voltage notching effects, and voltage spikes. Reactors may be tapped so that the voltage across them can be changed to compensate for a change in the load that the motor is starting.
Why reactors are used in substations?
In an electric power transmission grid system, switchyard reactors are installed at substations to help stabilize the power system. 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.
Where is shunt used?
The term shunt is used in filter and similar circuits with a ladder topology to refer to the components connected between the line and common. The term is used in this context to distinguish the shunt components connected between the signal and return lines from the components connected in series along the signal line.
How are shunt reactors used in power systems?
Shunt reactors are used in power systems to counteract the effect of the line parasitic capacitance, thereby stabilizing the system voltage within acceptable limits. The utility of shunt reactors for voltage control on lightly-loaded transmission lines was examined in a 1926 paper presented at the AIEE by Edith Clarke.
Why are shunt reactors without an iron core?
Shunt reactor may be designed without air or iron core to prevent the hysteresis loss as there are large amount of magnetizing current as compared to power transformer. Shunt Reactors are rated in MVAr while power transformer rated in kVA.
Why are air gaps provided in a shunt reactor?
Reactor magnetizing current is its rated current. Since a Shunt Reactor magnetizing current is large, if it is designed with Iron alone as a Power Transformer, there will be large hysteresis loss. Air gaps in Iron core are provided in a Shunt Reactor to reduce this loss and to minimize the remanent flux in the core.
Is the shunt reactor oil immersed or dry?
By construction, a Shunt Reactor can be oil immersed or dry type for both with and without iron core. Dry type Reactors are constructed as single phase units and are thus arranged in a fashion to minimize stray magnetic field on surrounding (in the absence of metallic shielding).