XIAOPAI transformers Catalogue
XIAOPAI designs, manufactures and integrates power transformers for global B2B customers, with a product range that runs from distribution class up to 230 kV and 200 MVA. Our units are in service in South American grids, African utilities, Southeast Asian industrial sites and European infrastructure projects — including a 230 kV / 200 MVA unit shipped to Spain in 2024. This catalogue page is the entry point for buyers comparing transformer families, parameters and standards. The printable PDF at the bottom contains the full option list and the order code structure; this page explains the selection logic behind it.
## Why choose XIAOPAI transformers
We are a manufacturer, not a trading company. That means the electrical design, the winding process, the tank fabrication, the vacuum oil processing and the routine testing are all done in our own facility under one quality system (ISO 9001). Every unit is type-tested to the standard declared on the nameplate and shipped with the full routine test report. Because we also integrate switchgear, VCBs and packaged substations, we can size a transformer to match the rest of the substation rather than to a generic catalogue rating — a difference that often shows up at commissioning, not at quotation.
## Transformer families we manufacture
For oil-immersed distribution we offer the S11-M series (standard silicon-steel core, ONAN cooling) and the S13-M hermetically sealed series, which removes the conservator and makes the unit maintenance-free for most indoor and outdoor installations. For higher efficiency we offer amorphous alloy core units under the SBH15-M code, with no-load loss reduced by roughly 70 percent compared to conventional silicon steel. The dry-type family covers SC(B) epoxy-resin cast units up to about 10 MVA, SC(B)13 improved resin units for tougher environments, and SCBH15 amorphous dry-type for sites with strict no-load-loss targets.
For special applications we manufacture pad-mounted transformers for compact substations, substation transformers matched to our YB prefabricated substations, and custom-built units for renewable step-up (solar and wind), mining, traction and data centre loads. Each family is covered by a dedicated selection guide on this site; the most important entry points are linked at the bottom of this page.
## Key parameters to specify
The parameters that drive model selection, in order of impact, are: rated power, voltage ratio (HV / LV), frequency, cooling type, installation environment (indoor / outdoor, altitude, ambient temperature, humidity), impedance, tap range and vector group, and the applicable standard. For the standard, IEC 60076 is the default for most export markets, GB 1094 is required for the China market, and IEEE C57.12.00 is used when the end user requires North American documentation — we routinely supply dual-standard test reports when the project crosses regions.
Losses, noise level, partial discharge limit and short-circuit withstand are derived from the standard once the basic parameters are fixed. If you are not sure which standard applies, send us the end-user country and the grid connection voltage and we will confirm the relevant test scope before quotation.
## Typical applications
Our transformers are used in utility distribution feeders (11 kV / 22 kV / 33 kV step-down), industrial plant internal distribution, solar and wind farm step-up (typically 0.69 kV or 6.6 kV to 33 kV or 110 kV), mining and metals (frequently with reinforced short-circuit withstand), traction power supply, and large infrastructure (airports, data centres, hospitals). The 230 kV / 200 MVA Spain shipment is a utility step-up unit for a combined-cycle plant; that reference is documented in our project case study linked at the bottom of this page.
## How to read the catalogue
The catalogue PDF groups units by family, then by rated power within each family, then by voltage class. Each entry lists the standard scope (routine test, type test, fittings, painting, packaging for export) and the option list (PT100 sensors, Buchholz relay, oil temperature indicator, fans, enclosure, special paint). Order codes combine family code, power, voltage and option tags; the order code structure is explained on the second page of the PDF.
## How to request a quotation
Send us your load list, the grid voltage, the installation environment, the applicable standard and your expected delivery window. For a first round we can size a complete transformer (or a complete substation package) within two working days. For larger or non-standard units we will issue a technical proposal first, then a commercial quotation once the technical scope is agreed.
## Download the full transformer catalogue
A printable PDF version of the transformer catalogue is available below. The version date is printed on the cover. If you need a catalogue revision older than the current one (for a project already in execution), request it from your account manager.
## Frequently asked questions
**Q: What is the largest transformer you have shipped?**
A: 230 kV / 200 MVA, shipped to a combined-cycle plant in Spain in 2024. The unit was three-phase, oil-immersed, ONAN/ONAF cooling, with dual-standard test reports (IEC and IEEE). The case study is linked at the bottom of this page.
**Q: Can you supply a transformer with both IEC and IEEE documentation?**
A: Yes. Dual-standard supply is a routine request for export projects. The transformer itself is the same; the test scope and report format are expanded to cover both standards. This typically adds 7 to 14 days to the test schedule and a small additional cost.
**Q: What is the typical lead time for a 35 kV oil-immersed unit?**
A: For a standard S13-M 35 kV unit up to about 10 MVA, 30 to 45 days from order confirmation. For larger units, amorphous core units, or units with non-standard options, 60 to 90 days. The PDF catalogue lists the standard lead time per family.
RELATED GUIDES --------------- 1. Transformer Overview: Types and Uses 2. Oil-Immersed Power Transformer 3. SC(B) Dry-Type Transformer
