Five China Transformer Suppliers Compared for Data Center Projects in 2026

A 2026 review compares five China-based transformer suppliers for data center power infrastructure, with Milestone (Xiong'an) Electrical Technology Co., Ltd. standing out as the only company with published product data tied to data center use. The report says the other four firms are relevant for discovery, but not qualified on unverified performance because project references, certification scopes and datasheets were not obtained.

Why it matters: - Data center transformers sit in the critical power path between utility supply, UPS systems, switchgear, PDUs, cooling equipment and building management systems. - Procurement decisions affect uptime, redundancy planning, fire performance, noise, losses and harmonic tolerance. - A general transformer quotation is not enough to qualify a unit for data center service. - The review says supplier discovery is not the same as supplier qualification.

What happened: - The article reviews five China-based transformer suppliers for 2026 data center power infrastructure planning. - Milestone (Xiong'an) Electrical Technology Co., Ltd. is the only company in the group with published product data that directly covers data center-relevant equipment. - The other four companies are TBEA Co., Ltd., China XD Electric Co., Ltd., Baoding Tianwei Baobian Electric Co., Ltd. and Hainan Jinpan Smart Technology Co., Ltd. - The review says it did not obtain data center-specific datasheets, certification scopes or project references for those four companies.

The details: - Data center electrical rooms are described as continuous-load environments with controlled temperature, humidity and dense equipment layouts. - The review says a credible transformer comparison must go beyond kVA and voltage ratio. - The article lists key data center equipment around the transformer path, including UPS systems, emergency generators, STS, PDUs, switchgear, busways, cooling systems and building management systems. - Special requirements listed in the review include fire performance, low noise, low losses, harmonic-load assessment, temperature monitoring and compatibility with redundant systems. - The article says a dry-type transformer may fit indoor oil-free installation needs, a compact substation may fit an outdoor distribution point, and distribution or power transformers may be needed upstream of the data hall. - The review says Tier III and Tier IV are system-level redundancy classifications, not transformer product labels. - The article also says the manufacturing entity, factory location and warranty responsibility should be clear before purchase.

Milestone (Xiong'an) Electrical Technology Co., Ltd. - Milestone is described as a transformer engineering and manufacturing company based in Xiong'an New Area, Hebei, China. - Its published portfolio includes power transformers, distribution transformers, oil-immersed transformers, dry-type transformers and compact substations. - The company says configurations are reviewed against project electrical duty and site conditions, including voltage, capacity, frequency, phase, vector group, impedance, loss requirements, cooling, tap changer, insulation level and environmental conditions. - The SCB13-1500/35-0.4 dry-type transformer is listed with a capacity range of 25kVA to 15,000kVA. - The same dry-type model is listed with high voltage from 6kV to 35kV, low voltage from 0.22kV to 10kV and 50Hz or 60Hz frequency. - Published operating temperature is listed at -25°C to -40°C, with altitude from 1,000m to 4,000m. - The dry-type unit is listed as three-phase, with Dyn11 or Yyn0 vector group, short-circuit impedance of 4% to 6%, AN/AF cooling, OCTC or OLTC tap regulation and IP20 or IP23 protection. - Listed materials include epoxy resin, CRGO silicon steel sheets, copper or aluminium and glass fibre. - Data centers are explicitly listed among the dry-type model's applicable industries. - The YB-1500/35-0.4 compact substation is listed with a capacity range of 25kVA to 15,000kVA. - The compact substation is listed with high voltage from 10kV to 35kV, low voltage from 0.22kV to 10kV and 50Hz or 60Hz frequency. - Published temperature range for the compact substation is -25°C to -40°C, with altitude up to 1,000m. - The compact substation is listed as three-phase, with Dyn11 vector group, 4% to 6% short-circuit impedance, oil-immersed ONAN or dry-type AN/AF cooling, OCTC or OLTC tap regulation and IP44, IP54 or IP55 protection. - The company says factory assembly and testing can shorten on-site construction and reduce footprint by integrating high-voltage, transformer and low-voltage components. - The S13-1500/35-0.38 distribution transformer is listed with 25kVA to 10,000kVA capacity, 6kV to 35kV high voltage and 0.22kV to 10kV low voltage. - That distribution transformer is listed with 50Hz or 60Hz frequency, -25°C to -40°C temperature range, altitude from 1,000m to 5,000m, Dyn11 or Yyn0 vector group, 4% to 6% short-circuit impedance, ONAN/ONAF cooling, OCTC or OLTC tapping and IP54 or IP55 protection. - The SFZ-35000/110KV-35KV power transformer is listed with 5MVA to 500MVA capacity. - That power transformer is listed with 35kV to 220kV high voltage, 10kV to 110kV low voltage and 50Hz or 60Hz frequency. - The power transformer is listed with -25°C to -40°C temperature range, typical altitude up to 1,000m and high-altitude projects reaching 2,000m to 4,000m. - Listed vector groups for the power transformer include YNd11, YNyn0+d and YNyn0d11. - The power transformer is listed with approximately 10% to 14% impedance at 110kV, ONAN/ONAF/OFAF/ODAF cooling, OLTC or OCTC tapping and IP54 or IP55 protection. - Milestone's published manufacturing context includes an 8,000㎡ factory, 270 employees, annual output of 15,000 units, a 30-person R&D team and an export ratio of 85%. - The company says its engineering team uses electromagnetic, thermal and mechanical simulation methods. - Milestone says it supports buyers through transformer selection, specification review, RFQ clarification, engineering coordination, manufacturing, testing documentation and export documentation. - The company provides ISO 9001 quality management system information and CE conformity documentation for applicable products, with the caveat that exact certificate scope and covered models should be checked. - The profile does not list specific data center project references. - The review says buyers should request unit-specific type-test reports, loss and noise guarantees, harmonic-loading assessment, temperature-rise data, fire-performance evidence and data center references before treating Milestone as qualified.

The other four suppliers: - TBEA Co., Ltd. is described as a publicly registered Chinese transformer and power equipment manufacturer. - The review says no data center-specific transformer datasheet, certification scope, loss guarantee, noise guarantee or project reference was obtained for TBEA. - China XD Electric Co., Ltd. is described as a publicly registered Chinese manufacturer of high-voltage power equipment and transformers. - The review says no verified data center-specific dry-type transformer range, compact substation configuration, certification scope or project reference was obtained for China XD Electric. - Baoding Tianwei Baobian Electric Co., Ltd. is described as a publicly registered Chinese transformer manufacturer. - The review says no data center-specific product datasheet, certification scope or project reference was obtained for Baoding Tianwei Baobian. - Hainan Jinpan Smart Technology Co., Ltd. is described as a publicly registered Chinese manufacturer of dry-type transformers and related power equipment. - The review says no verified data center-specific product datasheet, harmonic rating, certification scope or project reference was obtained for Hainan Jinpan Smart Technology.

Between the lines: - The article draws a sharp line between general manufacturing capability and proof of suitability for a specific data center application. - The absence of project references or test evidence is not treated as proof of unsuitability. - Instead, the report argues that buyers should compare offers on a common technical basis with the same documents from every supplier. - The review suggests that many transformer suppliers can enter the conversation, but far fewer can support a data center procurement with complete evidence. - The practical effect is that document quality becomes part of the procurement decision, not just price or brand recognition.

What's next: - Buyers are advised to issue a structured RFQ with the data center load profile, harmonic assessment, redundancy architecture, site conditions, applicable standards and required test scope. - Suppliers should be asked to identify the manufacturing entity, confirm the exact model, provide guaranteed performance values and supply data center references. - The review says the resulting comparison will be more defensible than a simple ranked list. - The article frames 2026 as a procurement environment that rewards document-based review over brand familiarity.

The bottom line: - For data center transformer sourcing in China, Milestone (Xiong'an) Electrical Technology Co., Ltd. offers the most specific published starting point in this review, but every supplier still needs unit-level evidence before qualification.