URJA Techniques (India) Pvt. Ltd. is an established manufacturer and international exporter of custom-designed reactor transformers, current limiting reactors, and power quality filter reactors. Operating under strict ISO 9001, ISO 14001, and ISO 45001 accreditations, our engineering faculty designs and manufactures reactors engineered to withstand continuous electrodynamic forces, thermal harmonics, and severe system short-circuit currents.
Modern electrical distribution and transmission infrastructures face escalating fault levels, transient switching surges, and high-frequency harmonic distortion caused by non-linear industrial loads such as Variable Frequency Drives (VFDs), electric arc furnaces, UPS systems, and traction rectifiers. URJA reactor transformers insert carefully regulated inductive reactance into electrical grids to restrain fault currents within the rated breaking capacities of downstream switchgear, stabilize transmission voltage profiles, and attenuate detrimental harmonics.
Our reactors are built using cold-rolled grain-oriented (CRGO) silicon steel laminations with gapped-core constructions or non-magnetic air-core geometries depending on operational linearity and inductance requirements. Utilizing electrolytic copper conductors with high-thermal-class Class H or Class F insulation systems, windings are braced with vacuum-pressure impregnation (VPI) or vacuum cast epoxy encapsulation. This mechanical bracing ensures absolute resilience against acoustic vibration and short-circuit mechanical stress throughout an extended 30-year operational life.
URJA reactors are deployed globally across mission-critical utility substations, renewable energy generation plants, and continuous heavy process industries:
Every reactor type is sized by our application engineers to meet exact short-circuit withstand levels, resonant tuning frequencies, and continuous thermal duty.
Installed in series with feeders, busbars, or generators to limit prospective fault current to manageable levels, permitting economical switchgear sizing and shielding upstream assets against catastrophic short circuits.
Connected line-to-neutral or across tertiary windings to absorb excessive capacitive reactive power on lightly loaded transmission lines and long underground cable networks, mitigating the Ferranti effect and steady-state overvoltages.
Integrated with power factor correction capacitor banks to establish tuned filtering paths for dominant 5th, 7th, 11th, and 13th harmonic currents, eliminating harmonic resonance and protecting capacitor banks from thermal degradation.
Protect variable frequency motor drives from mains voltage notches and transient spikes, while load-side reactors attenuate steep dV/dt voltage wave-fronts, reducing motor terminal stress, cable charging current, and acoustic motor whine.
Engineered for DC link circuits in high-power converters and capacitor switching schemes. Smooths DC ripple current, minimizes commutation notches, and suppresses high-frequency inrush currents during back-to-back switching.
Connected between transformer or generator neutral points and station earth grids to restrict phase-to-ground fault currents to safe, relay-coordinated levels without disrupting system grounding integrity.
Reference criteria used by consulting engineers and EPC procurement teams when specifying reactor units.
| Reactor Class | Installation Point | Primary System Objective | Core Design | Typical Standard |
|---|---|---|---|---|
| Series Current Limiting | Bus-tie, feeder, generator output | Fault current reduction, breaker protection | Air-Core or Gapped Iron-Core | IEC 60076-6 / IEEE C57.16 |
| Shunt Reactor | Transmission line, tertiary winding | Capacitive VAR compensation, voltage stabilization | Gapped Iron-Core / Magnetic Shield | IEC 60076-6 / IEEE C57.21 |
| Detuned / Harmonic Filter | Capacitor bank branches | Harmonic suppression, resonance prevention | Iron-Core with air gaps | IEC 60076-6 / IS 5553 |
| VFD Line / Drive Reactor | Drive mains input (Line side) | Surge protection, THDi reduction, notch suppression | VPI Dry Iron-Core | IEC 61800-3 / IEEE 519 |
| VFD Load Reactor | Inverter output to motor terminals | dV/dt attenuation, motor insulation protection | VPI Dry Iron-Core | IEC 60034-17 / NEMA MG1 |
| Neutral Grounding | System neutral to station earth | Earth-fault current limitation, relay coordination | Air-Core or Iron-Core | IEEE 32 / IEC 60076-6 |
Answers to common technical and procurement inquiries from overseas project contractors.
All URJA reactors are designed, built, and tested in rigorous conformance with IEC 60076-6 (Power Reactors), IEEE C57.21, IEEE C57.16, and Indian Standard IS 5553. Our units are accepted by global consulting firms and power utilities across the Middle East, Africa, and Southeast Asia.
Iron-core reactors utilize laminated silicon steel with discrete non-magnetic air gaps. They offer a compact footprint, self-contained magnetic fields with virtually zero stray flux, and high efficiency, making them the preferred choice for indoor enclosures and medium-voltage switchgear. Air-core reactors exhibit complete linear inductance without magnetic saturation under high short-circuit currents, making them suitable for outdoor yards where space allows appropriate phase-to-phase magnetic clearance.
By inserting an engineered, highly predictable inductive reactance into series circuits, our series reactors reduce peak short-circuit electrodynamic forces and thermal stresses on busbars and circuit breakers. This allows facility expansions without requiring complete replacements of existing switchboards.
Yes. We calculate and manufacture detuned reactors with exact p-factor ratings (e.g., 5.67%, 7%, or 14%) to shift the resonance frequency below dominant utility harmonics, protecting capacitors against overcurrent damage while stabilizing power factor under distorted waveform conditions.
Submit your electrical single-line diagram (SLD), system voltage, continuous current, inductance or reactance percentage, and harmonic spectrum to receive a detailed engineering proposal from our design team within 24 business hours.
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