From pole-mounted single-phase units up to 20 MVA solar inverter-duty transformers — every machine is designed, wound, tested and shipped from our works in Rajasthan. Each family below is engineered to a specific duty cycle, environment and standard.
The heart of the substation. Oil-immersed three-phase units that step voltage up and down across transmission and sub-transmission networks.
Designed for utilities, independent power producers and large industrial plants where reliability and low losses are non-negotiable. Cores are stacked from grade-M4 cold-rolled grain-oriented silicon steel and clamped to a rigid frame; HV and LV windings are disc-type or layer-type depending on duty.
Every unit is dried under vacuum, oil-impregnated, and routine-tested in our in-house test bay — including ratio, polarity, no-load loss, load loss, and impulse withstand. Type tests are conducted at CPRI Bhopal on customer request.
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Sealed, air-cooled designs with no insulating liquid — ideal for indoor installations, hospitals, high-rises and any environment where fire-load matters.
Available in two constructions: cast-resin (CRT), where windings are encapsulated in epoxy under vacuum; and VPI (vacuum pressure impregnated), where windings are coated with high-temperature varnish. Both are self-extinguishing and emit no toxic gases under fault conditions.
Class F or H insulation gives a long thermal life even in tropical ambient temperatures. With no oil, there is no leak risk, no firewall requirement, and minimal periodic maintenance — just an annual visual inspection and connection torque check.
Pole-mounted and pad-type units for rural electrification, last-mile distribution and dedicated single-phase feeders.
Compact, lightweight, and engineered for harsh outdoor service — sealed against ingress of moisture and dust, with corrosion-resistant tank finish for coastal and desert deployments. Bushings are porcelain or polymeric to suit the climate.
Available in hermetic (sealed, gas-cushioned) or conservator-type construction. Rural distribution variants are optimised for low no-load loss to minimise idle-running energy waste in lightly loaded feeders.
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The workhorse of industrial distribution. Engineered for long-haul plant feeders and commercial complex loads.
Available in delta-star, star-star, delta-zigzag and other vector configurations to match upstream impedance, fault levels and earthing schemes. Off-circuit tap changers come standard; on-load tap changers (OLTC) are available for stepless voltage regulation.
BEE star-rated variants meet the latest energy-efficiency labelling thresholds, reducing both no-load and load losses over the unit's 30-year service life. Standard finish withstands 1000-hour salt-spray testing.
Primary and secondary windings electrically separated — eliminating voltage spikes that interrupt or damage sensitive equipment.
Double-wound construction with a Faraday electrostatic shield between primary and secondary, tied to earth. This blocks high-frequency noise, common-mode disturbances and switching transients from passing through to the load — essential for medical operating theatres, lab instrumentation and data centre UPS inputs.
Medical-duty units conform to IEC 61558-2-15: leakage current is limited to under 100 µA, and the secondary is fully floating to provide single-fault tolerance. An insulation-monitoring device (IMD) interface is provided as standard.
Purpose-built for utility-scale PV plants — built to withstand continuous harmonic loading and the thermal demands of inverter output.
Solar IDT units don't see clean 50 Hz current. They see harmonic-rich waveforms from IGBT switching, where eddy-current and stray losses scale with the square of harmonic order. We rate windings for K-13 by default, with conductor transposition and electromagnetic shielding to manage local hot-spots.
Most utility-scale projects use a dual-secondary configuration (two inverters per transformer) to reduce footprint and BoS cost. We design and supply both single- and dual-secondary variants, with vector group, impedance and turns ratio matched to the inverter manufacturer's specification.
Every transformer we ship is engineered to the customer's duty cycle, environment and standards. Tell us what you need — impedance, vector group, harmonic profile, climate class — and we will design it.
Speak with our team