Factory delivery complete: 230kV 200MVA main transformer shipped to Spain.
230kV 200MVA Transformer Shipped to Spain: XIAOPAI Project Record
In August 2026, XIAOPAI completed the factory delivery of one 230 kV 200 MVA main power transformer to a substation project in Spain. The unit left the manufacturing facility, passed heavy-load logistics handling, and was prepared for sea freight to the Mediterranean port specified by the client. This page records the specification, testing, and export handling for buyers and consultants evaluating similar high-voltage transformer supply.
PROJECT SNAPSHOT
Project location: Spain
End-use: Grid-connected substation, bulk power transformation
Unit rating: 230 kV / 200 MVA
Cooling: ONAN / ONAF
Delivery month: August 2026
Export terms: FOB Ningbo / Shanghai per client instruction
XIAOPAI role: Manufacturer and supplier of the power transformer, responsible for production, testing, packing, export documentation, and pre-shipment coordination
WHY THIS VOLTAGE CLASS MATTERS
A 230 kV 200 MVA transformer is not a stock catalog item. At this level every parameter is project-specific: impedance, tap range, vector group, insulation medium, cooling arrangement, bushing orientation, and control cabinet protocol all have to match the receiving substation design. The buyer is normally a utility, EPC contractor, or large industrial end user that needs the transformer to interface with an existing 220 kV / 230 kV grid without interface surprises.
Spain and most of continental Europe operate at 220 kV / 230 kV for bulk transmission. A 230 kV rated unit therefore steps straight into the primary grid rather than into a lower distribution layer. This removes one transformation stage and reduces losses, but it also raises the technical and documentary requirements because the unit is treated as critical infrastructure equipment.
TRANSFORMER SPECIFICATIONS
The delivered unit was designed around the following typical 230 kV / 200 MVA parameters. Exact values are project-confidential; use the list below as a reference specification when you request a similar quotation.
- Rated power: 200 MVA
- High-voltage winding: 230 kV
- Low-voltage winding: Typically 11 kV / 13.8 kV / 15 kV, set per client substation design
- Tapping range: OLTC ±8 × 1.25% or equivalent DETC option
- Vector group: YNd11 or YNa0d1 per grid code
- Cooling: ONAN as standard, ONAF for emergency overload
- Insulation medium: Mineral oil to IEC 60296 / GB 2536
- Core material: CRGO silicon steel, fully mitered step-lap joints
- Winding material: Electrolytic copper conductor with kraft paper insulation
- Bushings: 230 kV oil-impregnated paper (OIP) or composite bushings, matched to local pollution level
- Protection: Buchholz relay, pressure relief device, winding temperature indicator, oil level gauge, oil sampling valve
- Paint finish: C5-M offshore / coastal corrosion class, suitable for Mediterranean climate
FACTORY ACCEPTANCE AND TYPE TESTS
The unit was tested in accordance with IEC 60076-1 and IEC 60076-2, with additional reference to IEEE C57.12.00 for customers that require U.S.-style documentation. The standard test package included:
- Measurement of winding resistance
- Ratio, polarity, and phase relationship
- No-load loss and exciting current at rated voltage and frequency
- Load loss and impedance voltage at rated current
- Temperature-rise test or design validation by equivalent method
- Insulation resistance and dielectric tests, including separate source AC withstand and induced overvoltage with partial discharge measurement
- Tank vacuum and leak test
- Functional tests for OLTC, Buchholz relay, temperature indicators, and cooling control
Test reports were issued in English with Spanish-language summary pages, prepared for utility submission. Third-party witness by the client's inspector was arranged before final packing.
HEAVY TRANSPORT AND EXPORT PACKING
A 200 MVA transformer is a heavy, high-value shipment. Transport planning started during design review so that dimensions and lifting points matched the road and port limits along the planned route.
Key logistics steps:
- Weight and center-of-gravity check before leaving the factory
- Corrosion protection and sealed preservation under nitrogen or dry air
- Wooden skid base with steel reinforcements, load-spreading design for roll-on / roll-off handling
- Moisture-sensitive instrumentation packed separately with desiccant
- Export crates for bushings, radiators, conservator, and accessories
- Shipping documents: packing list, commercial invoice, bill of lading, certificate of origin, test reports, material mill certificates, and HS code declaration
XIAOPAI coordinated the pre-carriage to port and handover to the client's nominated ocean freight forwarder. The client appointed their own marine insurer; XIAOPAI supplied the factory loading photos and pre-shipment condition report.
SITE READINESS AND COMMISSIONING SUPPORT
After arrival in Spain, the transformer is normally placed on its final foundation, oil is checked or topped up, and site acceptance tests are carried out before energization. XIAOPAI provides the following remote and on-site support as part of the supply:
- Installation supervision via video call or on-site visit depending on contract terms
- Commissioning test protocol aligned with the witnessed factory test results
- Spare-parts recommendation for critical first-fill of oil, gaskets, and relays
- Technical documentation in English or local language summary
For large transmission-class units, we strongly recommend using a local installation contractor familiar with 220 kV / 230 kV substation practices. XIAOPAI acts as the single technical point of contact between the client and the manufacturing team.
ABOUT XIAOPAI
XIAOPAI (Wenzhou Xiaopai Electric Power Technology Co., Ltd.) operates two equipment modules. The power transmission module covers design, manufacture, and supply of distribution and power transformers, vacuum circuit breakers, switchgear cabinets, and prefabricated substations. The flexible packaging module covers distribution of SINSTAR solventless laminating machines, film blowing machines, printing machines, slitting machines, and paper tube cutting machines. We work as a foreign-trade service provider with in-house manufacturing for power equipment and authorized distribution for flexible packaging equipment.
FAQ
Q1: Can XIAOPAI supply transformers above 230 kV?
A1: Yes. The 230 kV / 200 MVA Spain delivery is one reference project. Higher voltage classes can be discussed with the full rating, destination grid code, and site conditions.
Q2: What standards are followed for 230 kV transformers?
A2: Design and testing normally follow IEC 60076-1 and IEC 60076-2, with IEEE C57.12.00 used as a parallel reference when the client or end user requires it.
Q3: Does XIAOPAI handle only manufacturing, or also export logistics?
A3: XIAOPAI handles production, factory testing, export packing, pre-carriage to port, and documentation handover. The client usually appoints the ocean freight forwarder and marine insurer; XIAOPAI provides the loading and condition records needed for marine insurance.
Q4: How long does production take for a 200 MVA transformer?
A4: From approved drawings, a 200 MVA power transformer typically requires four to six months for core stacking, winding, assembly, drying, oil filling, and testing. Complex designs or third-party witness tests can extend this.
Q5: Can the client inspect the transformer before shipment?
A5: Yes. Factory acceptance tests with client or third-party witness are standard for this voltage class. Inspection is normally scheduled two to three weeks before the planned shipping date.
RELATED GUIDES
Before you request a quotation, these related articles and standards may be useful:
[ Transformer Oil Drying, No-Load Loss & Load Loss: 2026 Technical Guide ]
[ Who Manufactures 230kV Transformers in China? Buyer's Guide ]
[ Dry-Type vs Oil-Immersed Transformer: True Cost & Capacity Limits (2026) ]
External standards:
[ IEC 60076-1 ]
[ IEEE C57.12.00 ]
