Current Limiting Reactors

Current-limiting reactors are designed to limit short-circuit currents.


Three-Phase Current Limiting Reactors(PTT series)

Three-Phase Current Limiting Reactors


Low Voltage Three-Phase Current Limiting Reactors(PTOC, PTCT series)

Low Voltage Three-Phase Current Limiting Reactors


High Voltage One-Phase and Three-Phase Current Limiting Reactors(PTOC, PTCT series)

High Voltage One-Phase and Three-Phase Current Limiting Reactors


Smoothing Reactors(СРОС, СРОЗ series)

Smoothing Reactors



Coil of the reactor’s phase consists of a worm parallel winding with vertical channels for cooling, made of aluminum wire of APPTSD (АППТСД) type combined with polyimide-glass fiber insulation of heat resistance class H with operating temperatures up to 180 ° C. The first layer of wire insulation made of polyimide film, fully protecting aluminum wire from direct contact with the environment. Then - two layers of glass fiber with dipping and pasting of silicone varnish.

Coil winding is carried out on winders, specially adapted for this purpose (stepless speed regulation, adjustable torque on the motor shaft).


All insulating details of the reactor insulation are made of fiberglass of F class of thermal resistance (150°C).


Cross-head of the reactor is made of nonmagnetic steel. This avoids the losses caused by the magnetization reversal in the steel and considerably reduce eddy current losses.

Cross-head of the reactor is a rigid welded construction of multipath star type.


Reactor’s coil winding is carried out together with the installed in the mandrel cross-heads.

During winding of the coil crimping and axial coupling reactor by the glass bindings is produced. Glass bindings are made of glass binding ribbon of LSB (ЛСБ) type soaked by epoxide compound. The technology of tie is similar to the technology used by the company “NOKIAN”.


After welding of the transpositions, the phase of the reactor enters to the dipping site. Dipping is carried out by total immersion in a container with the silicone compound (varnish).

Dipping under vacuum is not required, as the coil is formed as a helical winding, and it lacks the interlayer insulation, preventing the free penetration of varnish.

After dipping the phase is loaded into the heat-treating furnace, where for 8 hours its curing occurs at a temperature of 160°C.

Dipping - curing cycle is repeated three times. Last curing occurs for 12 hours. Thus, the desired integrity and mechanical strength of construction is achieved.

View fotos of reactors


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