Our products

COIL Innovation develops and manufactures a broad range of air‑cooled reactors for medium‑ and high‑voltage applications. These include:
Neutral grounding reactors, installed between the transformer neutral and earth to limit ground‑fault currents and enhance grid safety. Filter reactors, used together with capacitors and resistors in filter systems to reduce unwanted harmonic currents through defined filter characteristics.
Test reactors for high‑voltage and high‑power laboratories, used for current limitation or in synthetic test circuits for the development and quality assurance of circuit breakers and power electronic components.
COIL Innovation also provides specialized solutions such as arc‑suppression reactors, reactors for railway mobility applications, duplex coils and further custom designs.

COIL Innovation supplies:
MSCDN reactors, which limit inrush currents, damp oscillations and resonances, reduce harmonics, and increase operational and system stability. Phase reactors for STATCOMs, protecting converters from overcurrents, providing precise reactive‑power control, attenuating high‑frequency harmonics, ensuring stable control behavior, and shielding the grid from steep voltage and current transients generated by power electronics.
TCR reactors, the central component of the controllable reactive‑power branch in SVC systems, enabling fast, stepless and secure AC‑voltage regulation.
MSR reactors, providing robust, stepped inductive reactive power with low design complexity, ensuring stable grid voltages.
TCSC systems, featuring a series capacitor bank with a parallel thyristor‑controlled reactor, enabling stepless adjustment of the electrical line length and highly flexible capacitive‑reactive power control.

COIL Innovation offers a broad range of reactors for HVDC and power‑electronics applications, which can be divided into several functional categories. DC smoothing reactors are installed on the DC side of the system to effectively reduce current ripple, influence resonance frequencies in a favorable way, and thereby increase the overall stability of the HVDC link. In fault conditions, these reactors also limit the maximum possible fault current and protect sensitive semiconductor components such as thyristor valves from transient overvoltages, for example those caused by grid disturbances or lightning events. For modular, multi‑arm converters, phase, arm and converter reactors are used. Their role is to limit internal circulating currents between converter arms, reduce the rise of DC fault currents, decouple individual control loops, and enable precise control of active and reactive power. At the same time, they act as inductive protection for the valve modules against transient phenomena originating from the AC network, ensuring stable dynamic behavior of the converter as a whole. In relation to power‑quality performance, filter reactors are utilized. These are typically combined with capacitors and resistors to form filter circuits that produce a defined harmonic response. They block harmonic currents or divert them through low‑impedance paths to ground, thereby improving current quality on both the AC and DC sides and reducing harmonic distortion typically produced by power‑electronic converters. COIL Innovation also manufactures specialized PLC reactors, damping reactors and high‑frequency reactors, each optimized for specific frequency bands or damping requirements. As series‑connected components, they provide high impedance at selected high‑frequency ranges, preventing the penetration of high‑frequency harmonics into either the AC or DC system. In doing so, they stabilize the operation of HVDC installations and power‑electronic systems, support the reliable transmission of sensitive control signals, and effectively damp undesired resonance phenomena within the wider system.

Applications include load‑flow regulation, load balancing and bus‑coupling. Installable at voltages up to 765 kV AC.

High‑voltage shunts are connected directly to the high‑voltage system and may be designed with either fixed or variable inductance. Their design requires extensive expertise in high‑voltage engineering, transient electrical phenomena, environmental influences, mechanical requirements and conservative design limits to ensure safe, reliable and long‑term operation.

These types of compensation reactors are either connected to the tertiary winding of a transformer or directly to the medium‑voltage system. They are designed for voltage levels up to 60 kV.

Line traps incorporate electronic tuning units that define their blocking characteristics, ensuring that communication signals remain on the designated transmission path while electrical energy transport continues without interference. The international distribution of carrier‑frequency line traps manufactured by COIL Innovation is managed by ARTECHE, a Spain‑based company that holds an exclusive agreement with COIL Innovation for a large portion of the global market.