A 35kV transformer is designed for use in a medium-voltage network with a nominal voltage around 35 kilovolts (kV), stepping voltage up or down to suit transmission, distribution, or industrial loads. The right choice depends on the actual system voltage, required capacity, secondary voltage, installation environment, and applicable local standards—not on the 35kV designation alone. Buyers should confirm these conditions before requesting a quotation, then compare transformer construction, electrical specifications, protection needs, and supplier documentation.
You can find more information on our web, so please take a look.
This guide explains the main 35kV transformer types, where they are commonly used, and which details to include in a technical inquiry. It is intended for project owners, EPC contractors, utilities, distributors, and industrial procurement teams. Because specifications and regulatory requirements vary by project and market, treat example values as planning references rather than universal requirements.
This selection guide is for B2B buyers evaluating a transformer for a new installation, network expansion, replacement project, or equipment package. It can help you prepare a clearer technical specification before contacting manufacturers or comparing offers. Final design decisions should be checked by qualified electrical engineers against the site design, grid requirements, and applicable codes.
A transformer transfers electrical energy between circuits through electromagnetic induction, changing voltage while operating at the specified frequency. In a distribution application, a 35kV primary may supply a lower-voltage secondary for local distribution or facility use. In other network designs, the transformer may serve a different step-up or step-down function, so the actual winding voltages must be stated rather than inferred from the product name.
Transformers do not independently provide every function required by a substation or power system. Switching, overcurrent protection, surge protection, earthing, monitoring, and control are typically addressed by the wider installation design. Confirm which equipment is included in the supply scope and which items must be provided by the buyer or another contractor.
Oil-immersed designs use insulating liquid around the core and windings for insulation and heat transfer. They are commonly considered for outdoor substations and distribution applications where the site can accommodate the transformer, required clearances, and any containment or fire-safety provisions specified by the project. Ask the supplier to state the cooling arrangement, insulating-liquid details, monitoring accessories, and maintenance requirements.
Dry-type transformers use air and solid insulation rather than an insulating liquid. They may be considered for indoor installations or sites with particular fire, environmental, or maintenance constraints, subject to the project design and the manufacturer’s available voltage and capacity range. Check enclosure protection, ventilation, installation clearances, noise requirements, and environmental conditions before specifying this option.
Core design and winding material affect the transformer’s electrical and thermal design, but a material label alone does not establish suitability or total operating cost. Copper and aluminum windings are both used in transformer manufacture; the appropriate option depends on the required design, electrical performance, dimensions, and procurement criteria. Ask for the proposed material and the rated performance information needed to compare bids on an equivalent basis.
35kV transformers may be used in utility distribution networks, renewable-energy facilities, industrial plants, mining or infrastructure projects, and substations serving large sites. The same nominal voltage does not mean that one transformer design fits all these applications. Load behavior, grid conditions, ambient temperature, altitude, installation location, and operating duty can all affect the specification.
| Application | Selection considerations |
|---|---|
| Utility or distribution substation | Network voltage, secondary distribution voltage, protection coordination, standards, and future load planning. |
| Industrial facility | Load profile, motor starting or other large load behavior, indoor or outdoor location, and maintenance access. |
| Renewable-energy project | Interconnection requirements, operating conditions, power-flow direction, and project-specific grid requirements. |
| Replacement project | Existing footprint and connections, electrical compatibility, accessory interfaces, and commissioning requirements. |
Begin with the electrical data that defines how the transformer will connect to the network and load. For example, specify a 35 kV nominal primary where that is the actual system requirement, and identify the secondary voltage explicitly, such as 10 kV or 0.4 kV if applicable to the project. State the system frequency—commonly 50 hertz (Hz) or 60 Hz—and do not assume that a supplier will infer it from the destination country.
Liye Product Page
Also provide site conditions such as indoor or outdoor installation, ambient temperature range, altitude, humidity, pollution exposure, and any noise limit. These details help the manufacturer assess cooling, insulation, enclosure, and accessory requirements. For example, a project operating at 50 Hz should not be quoted against a 60 Hz design without explicit engineering confirmation, because frequency is part of the transformer’s rated operating conditions.
A frequent mistake is treating “35kV” as a complete specification. It does not identify the secondary voltage, rated power, frequency, connection, or insulation requirements. Another is selecting capacity only from the current average load without reviewing the project’s peak demand, future expansion, or load characteristics.
Buyers can also overlook site constraints and scope boundaries. An offer may not include the same accessories, monitoring devices, protection equipment, installation services, or commissioning support as another offer. Use a common specification and request a written list of deviations so that commercial comparisons are meaningful.
The price of a 35kV transformer depends on the technical design, rated capacity, construction, winding material, accessories, testing, documentation, and delivery requirements. Changes to specifications or requested customization can affect both quotation and manufacturing planning. There is no reliable universal price or minimum order quantity that applies to every design and supplier.
Lead time should be confirmed in the supplier’s quotation, with the schedule basis clearly stated. Ask whether the stated timing begins after technical approval, deposit, or another milestone, and whether it includes inspection, packing, and shipment. For an accurate proposal, share the technical schedule, quantity, destination, required delivery date, and any project inspection or document requirements.
Evaluate suppliers on their ability to respond to the project specification, not only on the initial price. A capable manufacturer or supplier should be able to explain the proposed design, identify open technical points, and provide the documentation agreed for the order. Request evidence relevant to your project, such as product drawings, nameplate data, test documentation, quality procedures, and references where available and verifiable.
Liye works with B2B buyers seeking electrical equipment and supplies, including medium-voltage transformer solutions. To assess a 35kV transformer requirement, we need the project’s voltage ratio, rated power, frequency, application, installation conditions, applicable standards, quantity, and destination. Sharing a specification sheet or single-line diagram can help clarify the intended configuration and identify questions that should be resolved before quotation.
When you contact Liye, include your target delivery schedule and any requirements for testing, drawings, accessories, or documentation. We can review the information provided and discuss a suitable product configuration and quotation scope. Final selection should be confirmed against the project’s engineering design and local requirements.
The best 35kV transformer is the one that matches the project’s actual network, load, environment, and compliance requirements. Confirm the primary and secondary voltages, frequency, rated power, construction type, insulation requirements, and scope of supply before comparing prices. These details reduce ambiguity and help suppliers provide offers that can be evaluated on a like-for-like basis.
Your next step is to prepare a technical schedule with the project data listed in this guide, then share it with qualified suppliers for review. If you are sourcing a 35kV transformer, send Liye your application details, key electrical parameters, quantity, and destination so we can discuss the appropriate inquiry requirements.
Want more information on 35kv transformer? Feel free to contact us.