Air-core coils


Single-phase and three-phase chokes with air-core produced by Elhand Transformatory are used in systems with capacitors batteries as smoothing chokes or filtering chokes. They also operate as shunt reactors to compensate capacitive reactive power of power lines or as limiting chokes that reduce the value of short-circuit currents. They may also operate as limiting chokes that limit the steepness of voltage rise du/dt or current rise di/dt. Air-core coils are produced using modern components and technologies in the manufacturing process combined with innovative design solutions and can meet the highest standards of quality and reliability. The windings of air-core coils inductors are made of cooper wires and appropriately selected insulation materials. The choke structure made of paramagnetic steel alloys and glass-epoxy components effectively eliminates arising of additional losses. We produce chokes according to the individual and unique customer's specifications

Technical data

Design Chokes are produced in accordance with standards:
EN/IEC 60076-6; EN/IEC 61558-2-20;PN-EN 60310; PN-EN 61373;
Insulation class


Climatic class
/ Environmental class

C1/E0 - land design
C2/E1 - maritime design

Ambient temperature 40oC
Protection degree IP 00
Cooling AN, AF
Inductance tolerance ± 10%
Rated voltage DC 0,75kV, 3kV, 6kV
Terminals screw terminal blocks or cable lugs or copper bus bars
Fastening by means of plastic supports