2.5MVA Transformer

Baoding Zhongyi Electric Corporation is one of the leading manufacturers and suppliers of 2.5mva transformer in China, featured by quality products and good price. Please rest assured to buy advanced 2.5mva transformer for sale here from our factory.

This page covers one build of the 2.5 MVA transformer. Oil-immersed, three-phase, 33 kV on the primary, 415 V on the secondary. We make it in Baoding, China, to IEC and ANSI design rules. Two numbers on this page decide whether it suits your network: impedance and short-circuit strength. Check those before you compare prices.

Where a 33 kV to 415 V unit is used

A site that already owns the 33 kV switchgear and the 415 V distribution board rarely wants a third voltage level squeezed in between, and that gap between the two is exactly what this transformer is built to fill.

Industrial plants that take their supply at 33 kV and distribute internally at 415 V, so no intermediate 11 kV stage is needed.

Utility distribution substations where the 33 kV feeder has to serve a local 415 V network.

Mines, quarries and ports, where 33 kV rings are standard practice and the load centre is far from the main substation.

Large commercial and institutional sites - hospitals, data centres, campus buildings - with their own 33 kV intake.

Wind and solar collection stations where 33 kV is the array voltage and 415 V serves the station auxiliaries.

Published specifications

Product Details:
The 2.5MVA transformer is designed to meet international standards and is made of high-quality materials that ensure durability and reliability. It features an iron core that provides low magnetic losses, low operational noise, and a stable output voltage. Additionally, it has a winding design that ensures efficient power transfer and reduces the risk of overloading.

Product Production Process:
Our 2.5MVA transformers are manufactured using the latest technology and equipment. The production process involves several stages, including design, material selection, core assembly, winding, insulation, and testing. We pay great attention to quality control to ensure that every transformer that leaves our factory meets the highest standards.

What ships with the unit, and what gets tested

Typical fittings for this class: conservator, breather, Buchholz relay, pressure relief device, oil and winding temperature indicators, oil level gauge. Confirm the list against our quotation, because adding a fitting later costs more than ordering it now.

Routine tests on every unit: ratio and vector group, winding resistance, impedance and load loss, no-load loss and current, insulation resistance, applied and induced dielectric tests, oil dielectric strength, oil moisture, and a tank leak test.

Type tests on the design: lightning impulse and temperature rise. A short-circuit test can be quoted where the specification demands it.

Buyer witness of the routine tests is welcome. Say so at order stage and it goes into the test schedule.

Product Packaging:
We take great care in packaging our transformers to ensure that they are delivered to our customers in perfect condition. The transformers are packed in wooden crates and covered with protective material to prevent damage during shipping.

Questions buyers ask at this rating

Why a 33 kV primary rather than 11 kV?
Because that is the voltage at which the supply arrives. Where the site already runs a 33 kV ring or takes a 33 kV utility connection, stepping straight to 415 V removes one transformation stage and its losses. Quote the voltage you actually have.

Oil-immersed or dry type at 2.5 MVA?
Oil costs less and handles the rating comfortably. Dry type removes the fire risk and the containment problem, which is what matters indoors. Outdoors, oil usually wins. Inside a building with a strict code, dry type usually does.

What does 5% impedance mean for our LV protection?
It sets the fault current the LV switchgear has to interrupt: roughly 70 kA at the secondary terminals on this rating, before source impedance is added. Breaker rating and discrimination study are both built on that number, and changing the impedance later means redoing the study.

Can it run at 45 °C ambient or at 1800 m altitude?
Yes, with a derated design. Send the site conditions with the enquiry and the derate is stated in the quotation.

Can noise be lower than 65 dB?
Often yes, and it is quoted rather than promised. Tell us the limit and the measurement distance your standard uses.

Do you build the same rating for 60 Hz?
Yes. Flux density and cooling are adjusted for 60 Hz operation.

Ordering a 2.5 MVA transformer starts with a short list like that one. Send it and you will get the general arrangement drawing, the loss budget, the oil quantity and a delivery date you can plan around.

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