The 1 MVA Milestone: Robustness & Reliability

The 1000 kVA Dry Type Transformer represents the "gold standard" capacity for main building power and heavy industrial feeders. It marks the transition into the megawatt class, where the physical stresses on the windings require advanced structural engineering.

As a high-capacity three phase dry type transformer, this unit must physically withstand the "magnetic hammer" effect of a short circuit. To guarantee this, we utilize a Heavy-Duty Channel Steel Framework. Unlike smaller units that rely on simple tie-rods, this 1 MVA model uses upper and lower steel crossbeams to clamp the coils like a vice. This rigidity prevents the windings from telescoping or shifting during electrical faults, preventing catastrophic mechanical failure.

Cast Resin Technology: The Silica Ratio

The longevity of a 1000 kVA unit depends entirely on the quality of its insulation mixture. We utilize a premium dry type cast resin system that functions more like engineered stone than plastic.

The Mixture: We mix epoxy resin with a high concentration of Quartz Silica Flour under vacuum. This isn't just for insulation; the silica adds massive mechanical strength.
Crack Prevention: Because this mixture is tuned to have the same thermal elongation properties as the copper conductor, the insulation moves with the metal, not against it. This means the coil remains solid and crack-free, even when the unit undergoes rapid heating from a cold start (-25°C) to full operating load.

Brass tap changer links on 1000 kVA cast resin transformer coil

surface.

Partial Discharge & Electrical Health

For a 10 kV or 11 kV transformer dry type insulation system, "Partial Discharge" (PD) is the silent indicator of insulation failure.

The Standard: While industry standards often allow for up to 20pC (pico-Coulombs) of discharge, our 1000 kVA coils are cast under strict vacuum conditions to prevent air voids.
The Result: We guarantee a Partial Discharge level of <10 pC. This exceptionally low value indicates a void-free solid insulation, ensuring the dielectric material is not slowly eroding from the inside out, which is critical for high-reliability assets like hospital mains or data center feeds.

Factory partial discharge testing in shielded room ensuring

low PD levels.

Technical Data Sheet

Technical Parameter	Specification Data
Rated Power	1000 kVA (1 MVA)
Primary Voltage	6kV / 10kV / 11kV / 13.8kV
Secondary Voltage	400V / 415V / 480V
Insulation Tech	Vacuum Cast Resin (Quartz Filled)
Partial Discharge	< 10 pC (High reliability)
Impedance Voltage	6.0% (Standard)
Cooling	AN (Natural) / AF (Forced +40%)
Enclosure Rating	IP20 / IP23 / IP33 (Dust/Splash Proof)
Temperature Sensor	PT100 in LV Windings

Typical Application Context

Public Infrastructure: Powering metro stations or airport terminals where the low smoke (F1) and non-explosive nature of the resin is mandatory for passenger safety.
Industrial Plants: Installed in "dirty" manufacturing environments (e.g., cement or textile mills). The solid resin surface is smooth and non-tracking, allowing conductive dust to be easily wiped off during maintenance shutdowns.
Indoor Substations: Replacing oil units in basement switchrooms to remove the fire risk and the need for expensive oil-catchment civil works.