Why air cored type reactors are preferred?
Air-core reactors use air which is magnetically linear to carry the magnetic field. Hence an air- core reactor is linear, i.e. its inductance value does not depend on its current load. Even when overloaded, the air-core reactor it will not saturate.
What is a air core reactor?
Dry type air core reactors are devices which are used at both distribution and transmission voltages for a variety of applications such as fault current limiting, power flow control, reactive compensation (shunt reactors), and as the inductive part of tuned harmonic filters.
What is the difference between air core and iron core inductor?
The use of ferrite-core inductors is limited to small power applications, whereas air-core and laminated iron-core inductors are employed in the medium-to-high power range. The choice of the core medium strongly affects the behavior of the inductor versus frequency.
Why is core shunt reactor gapped?
Core of Shunt Reactor The core is constructed from Cold Rolled Grain Oriented Silicon Steel sheet to reduce hysteresis losses. The sheets are laminated to reduce eddy current losses. Gaps are intentionally provided in the construction by placing spacers of high modulus of electricity between the packets of laminations.
What is the disadvantages of generator reactor?
There is a constant voltage drop and power loss in the reactors even during normal operation. In the event of fault the voltage of common bus bar reduced to zero which will accelerates the generator leading to instability and generator may loose synchronism.
How is MVA fault calculated?
Fault MVA at Motor Control Panel = Base MVA / Z Pu-a. Fault MVA at Motor Control Panel = 2.5 / 0.27317. Fault MVA at Motor Control Panel = 9 MVA. Fault Current = Fault MVA / Base KV.
Why reactors are used in substations?
In short, a substation reactor is essentially a coil that has several turns and fairly high resistance values. Electrical reactors are typically used on a transmission line when it’s necessary to limit currents that could damage a power transformer or other power system.
How does a reactor limit fault current?
Reactors can be installed anywhere in the distribution circuit in order to limit the fault current. Since they are essentially a linear inductive reactance, their impedance will add arithmetically to the system impedance and result in a reduction of the fault currents.
What is difference between core and coil?
As nouns the difference between coil and core is that coil is something wound in the form of a helix or spiral or coil can be a noise, tumult, bustle, or turmoil while core is crow.
How does a shunt reactor work?
A shunt reactor is a piece of electrical equipment used in high voltage power transmission systems to stabilize the voltage during load variations. A traditional shunt reactor has a fixed rating and is either connected to the transmission line all the time or switched in and out depending on the load.
Why air core reactors are used for current limiting in power system network?
The main motive of using current limiting reactors is to reduce short-circuit currents so that circuit breakers with lower short circuit breaking capacity can be used. They can also be used to protect other system components from high current levels and to limit the inrush current when starting a large motor.