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MANUFACTURER PROFILE

Nantong Hyosung Transformer

Extra-high-voltage manufacturing in Haian, with a distinct expansion project and a documented role in local quality standards.

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Nantong Hyosung manufactures power transformers in Haian, Jiangsu. Its procurement relevance is the Nantong production site: a Hyosung factory identified in the group's own reporting, rather than an undifferentiated list of everything supplied by the global group. The profile separates the operating business, a later factory expansion and the engineering information needed for an extra-high-voltage enquiry.

Manufacturing location
Haian, Nantong, Jiangsu
Chinese entity
南通晓星变压器有限公司
Published voltage envelope
750 kV and below, in the November 2025 government account
Group identity
Hyosung; group brand shown
Procurement focus
Extra-high-voltage power-transformer enquiries
01

The Nantong factory within Hyosung

Hyosung's October 2015 report describes a visit to the Nantong transformer plant by its manufacturing partners. It specifically identifies extra-high-voltage transformer production and a programme concerned with manufacturing processes and site management. That gives a useful connection between the group brand and this production location. It does not transfer the capabilities of every Hyosung factory to Nantong.

For an enquiry, name Nantong Hyosung Transformer and the proposed manufacturing site in the scope of supply. A group-branded presentation can introduce the supplier, but the contract, drawings, inspection plan and factory acceptance documents should identify the actual supplying entity. This is particularly useful when a purchasing team is comparing offers from multiple production locations within an international manufacturer.

References: [1]

02

A dated development record

Haian's November 2025 report dates the company's establishment to 2006 and the start of production to October 2007. It identifies power transformers at 750 kV and below as the principal product range. These are dated descriptions of the Nantong business, not specifications for a particular transformer.

The same report announces the November 22, 2025 groundbreaking for a second-phase intelligent factory project planned for 100 extra-high-voltage transformers per year. Groundbreaking and planned output are separate from commissioning and available production slots. A buyer considering a long-duration project should ask which production line will execute the order and obtain an order-specific manufacturing schedule.

  1. 2006

    Company established

    Establishment date reported by Haian in November 2025.

  2. October 2007

    Production begins

    Start of production stated in the same dated government account.

  3. 22 November 2025

    Second-phase groundbreaking

    Project planned for 100 extra-high-voltage transformers per year; commissioning is a separate milestone.

References: [3]

03

Match the electrical duty before comparing offers

Scroll sideways to compare all columns.

Enquiry decisionInformation to includeExpected proposal detail
Electrical configurationWinding voltages, frequency, vector group and system earthingMatching rated winding and insulation schedule
Loading and coolingRequired MVA, operating load profile and cooling stagesRatings and auxiliaries for each offered cooling mode
Voltage regulationTap range, tap step and operating requirementsTap-changer arrangement and control interfaces
Site integrationTerminal layout, foundations and transport constraintsGeneral arrangement and installation responsibilities

The published voltage envelope is a starting point for supplier discovery. A useful offer still needs the winding arrangement, assigned voltage and insulation levels, MVA ratings under each cooling stage, tap range and regulation scheme. A transformer serving a generator, a transmission interconnection or a distribution interface can require a different specification even when the nominal voltage is similar.

Build the enquiry around a single-line diagram and an operating duty. Identify the required neutral arrangement, terminal connections and protection interfaces. For a replacement, provide the existing transformer nameplate and interface drawings; for a new installation, provide the station arrangement and the purchaser's applicable technical specification. The objective is a reviewable design proposal for the Nantong site, rather than a generic catalogue acknowledgement.

References: [3]

04

Quality development with an identifiable local role

The national standards information platform lists Nantong Hyosung as a drafting organisation for DB3206/T 1109-2025, the Nantong guide for improving the quality of power-transformer manufacturers. Published and effective on May 6, 2025, the guide covers quality management, design and development, production processes, testing capability and quality digitalisation. Its scope includes liquid-immersed and dry-type transformer manufacturers.

That is a specific organisational role in a published standard. For procurement, use it as a prompt to discuss how the proposed transformer will be designed, controlled and inspected. Drafting participation is not a type-test result for the buyer's model, nor does it establish that every product in the guide's scope is manufactured at Nantong. Ask for the inspection and test plan that will apply to the actual offer, including the purchaser's review and witness points.

References: [2]

05

Compare losses and impedance on the same design basis

Request no-load loss, load loss and impedance as guaranteed values for the proposed design. Record the rating, tap position and reference conditions alongside those values. An attractive loss figure cannot be evaluated properly if it belongs to a different winding arrangement or cooling rating. Keep the commercial loss evaluation tied to the equipment being quoted.

For an extra-high-voltage tender, submit the purchaser's loss-capitalisation method and any required tolerances with the enquiry. Ask the supplier to explain how the guarantees will be demonstrated at factory acceptance. Where parallel operation is required, include the existing unit's ratings and measured or nameplate impedance so that the proposed design can be reviewed against that installation. These are purchaser preparation points, not published numerical guarantees from Nantong.

06

Plan inspection, delivery and the site handover together

A factory visit and an expansion announcement answer different questions from a delivery commitment. Agree a schedule that identifies design approval, material readiness, production, factory testing, shipment and site activities. If the offer relies on the newer factory project, request its commissioning status and the line allocated to the order before treating a projected output figure as available capacity.

Include transport envelope and access constraints in the initial enquiry. Ask who supplies accessories, transport protection, installation supervision and the records required at handover. Keep the final document set associated with the transformer serial number and manufacturing entity. This makes it possible to assess the offer on a complete supply boundary while keeping the enquiry and follow-up conversation within PowerTransformerB2B.

References: [1] [3]

A project brief the factory can respond to

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Questions buyers ask

Is the 100-unit annual figure an operating production guarantee?

No. It is the planned annual output stated for the second-phase project at its November 2025 groundbreaking. Ask for commissioning status and the production slot relevant to your order.

Does the Hyosung name identify the manufacturing location?

It identifies the group brand. Specify Nantong Hyosung and the actual production site in the offer and inspection documents so that the manufacturing responsibility is clear.

Does participation in the quality guide certify a quoted transformer?

The SAMR record establishes a drafting role in DB3206/T 1109-2025. A quoted transformer still needs its own design guarantees, inspection plan and applicable test documentation.

What should accompany an extra-high-voltage enquiry?

A single-line diagram, winding and insulation requirements, rated duty and cooling stages, tap requirements, loss evaluation basis, site interfaces and the required delivery and acceptance schedule.

Sources

3 sources · checked 8 October 2026

Prepared by PowerTransformerB2B. Checked 8 October 2026. The sources below identify the published company information and any dated public records used for this profile.

Company catalogues describe product families and options. Before you order, ask the manufacturer for the type-test report and acceptance documents for your exact model and rating.

  1. [1] Manufacturing partner visit to the Nantong transformer plant, October 2015Hyosung · Manufacturer original report
  2. [2] DB3206/T 1109-2025 power-transformer manufacturer quality guideNational Public Service Platform for Standards Information · Original standards registry
  3. [3] Second-phase intelligent factory groundbreaking, November 2025Haian Municipal Government / Haian Daily · Dated government report