Electromagnetic Reactor

Electromagnetic ReactorAn electromagnetic reactor is an inductor designed to solve the problem of short circuits within an electric circuit. It has constant inductive reactance and is connected in series with the load. Under standard conditions, we can observe a 3-4% voltage drop on the reactor, which is absolutely normal. In the event of a short circuit the largest part of the voltage falls onto the reactor. The maximum value of surge current is calculated according to the following formula:Where im- maximum surge current;Ih - rated mains current;Xp - reactance of the reactor.Thus, the higher the reactance, the lower is the maximum surge current. The reactance is directly proportionate to the inductive reactance of the inductor. Under high current values, the cores in the coils with steel cores get saturated, which significantly decreases the reactance, and, as a result, the reactor looses its current-limiting properties. That's why reactors are made without the steel cores, despite the fact that, in this case, reactors do need to be bigger and heavier to maintain the same value of inductance.Structurally, there exist two types of reactors: concrete reactors designed for the voltage of up to 35 kV, and oil-immersed reactors for the voltage over 35 kV.Today the problem of short circuits and large consumption pulses can be solved with the help of electronic potentiometers, which replace and supplement electromagnetic reactors and help to consume energy and space in a more efficient manner.

Category:

Science & Technology

Tags:

• closing
• coil
• electromagnetism
• inductance
• load