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Nanjing Daqo Transformer logo

MANUFACTURER PROFILE

Nanjing Daqo Transformer

10–35 kV catalogue routes, with dated CQC records that identify the actual model and certificate scope.

Discuss your project

Nanjing Daqo Transformer Co., Ltd. (南京大全变压器有限公司) supplies distribution and specialist transformer equipment within Daqo Group. For a dry-type purchase, start with the 10/0.4 kV or 20 kV SCB catalogue route; for traction, use the separate ZQSCB specification. CQC’s April 2025 bulletin names the Nanjing entity on defined 10 kV dry-type, oil-filled and amorphous-core model groups, with stated validity to 31 March 2028. The certificate table below ties those records to ratings rather than treating certification as a company-wide product guarantee.

Chinese legal entity
南京大全变压器有限公司
Public-record address
28 Yinlong Road, Jiangning Economic and Technological Development Zone, Nanjing, Jiangsu
Company identifier
91320115768199969Q
Group relationship
Daqo Group subsidiary, as described in the public enterprise record
CQC source
April 2025 bulletin; stated validity to 2028-03-31
Checked
4 November 2026
Generic dry-type transformer assembly hall with cast-resin coils and overhead handling equipment
Dry-type transformer assembly hall.
01

Identify the Nanjing manufacturer on the order

The Weihai public-resource enterprise record identifies the legal entity, address and company identifier shown above. Its registration field says 27 January 2005; the accompanying company description says established in 2004. Use the registration field for the entity record and ask for the current licence when contracting. Daqo Group publishes the product pages used here, while CQC names 南京大全变压器有限公司 as manufacturer in the certificate entries.

A Nanjing government report dated 27 February 2026 describes the local dry-type operation with reported monthly capacity of 1,200 units. Define the contracting entity, manufacturing location, serial-number traceability and delivery programme in the offer.

References: [4] [5] [6]

02

Choose the voltage route before comparing capacity

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Catalogue family and voltagesPublished capacityConfiguration points
SCB12 / SCB14 / SCB18; 10/0.4 kV30–5,000 kVAIndoor; impedance 4–10%; F/H insulation options
SC(B)12 / SC(B)14 / SC(B)18; 20/0.4 or 20/10 kVTwo blocks: 30–5,000 and 30–25,000 kVAThe page does not assign every capacity to a particular pairing
ZQSCB traction rectifier; HV 10/20/35 kV; LV 0.59/1.18 kV30–4,000 kVAImpedance 6–8%; rectifier-system interface required

These are website catalogue ranges checked on 4 November 2026; the pages do not identify a revision-controlled technical schedule. Keep a copy of the agreed model data sheet with the purchase order. The 20 kV capacity blocks require a model-specific quotation. Ask for the model schedule that shows your exact voltage and kVA.

For parallel operation, request a selected impedance and tolerance, connection group and tap arrangement. A family-wide impedance range is insufficient. For ZQSCB, specify the rectifier pulse arrangement, secondary circuits and phase displacement; the transformer supplies the rectifier, which performs the AC-to-DC conversion.

References: [1] [2] [3]

Unbranded cast-resin transformer and test leads in an industrial acceptance-test bay
Cast-resin transformer in a test bay.
03

10 kV dry-type models and their CQC numbers

Issuer: China Quality Certification Centre (CQC). These bulletin entries take effect on 2025-04-01 and state validity to 2028-03-31. They name Nanjing Daqo and insulation thermal class H.

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10 kV model groupListed capacities (kVA)CQC number / validity to
SC14 /10-NX230, 50, 80, 100, 125, 160CQC22701345296 / 2028-03-31
SC18 /10-NX130, 50, 80, 100, 125, 160CQC22701345294 / 2028-03-31
SC14 200/250; SCB14 315/400/500/630; /10-NX2200, 250, 315, 400, 500, 630CQC22701345299 / 2028-03-31
SC18 200/250; SCB18 315/400/500/630; /10-NX1200, 250, 315, 400, 500, 630CQC22701345301 / 2028-03-31
SCB14 /10-NX2630, 800, 1,000, 1,250CQC22701345297 / 2028-03-31
SCB18 /10-NX1630, 800, 1,000, 1,250CQC22701345285 / 2028-03-31
SCB14 /10-NX21,600, 2,000, 2,500CQC22701345298 / 2028-03-31
SCB18 /10-NX11,600, 2,000, 2,500CQC22701345295 / 2028-03-31

The model column abbreviates the bulletin’s alternate SC-/SCB- and SC14/SC18/SCB14/SCB18 designations; the rating is inserted before /10. The 200–630 kVA mixed SC/SCB entries explicitly state 4% short-circuit impedance. The overlapping 630 kVA entries are separate certificate groups, so identify the actual design and certificate in the supplier’s response.

The June 2022 bulletin gave these same eight certificate numbers an end date of 5 June 2025. The April 2025 bulletin provides newer effective and end dates. Use the newer record when comparing the published certificates; obtain current status and the complete certificate annex before accepting a certification requirement.

References: [6] [7]

04

Oil-filled and amorphous-core records are separate routes

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10 kV model groupListed capacities (kVA)CQC number; effective / stated end
S22-M /10-NX130, 50, 63, 80, 100, 125CQC19701220644; 2025-04-01 / 2028-03-31
S22-M /10-NX1630, 800, 1,000, 1,250, 1,600CQC19701220646; 2025-04-01 / 2028-03-31
SCBH17 /10-NX2; class H1,600, 2,000, 2,500CQC25701466526; 2025-04-01 / 2028-03-31
SCBH19 /10-NX1; class H1,600, 2,000, 2,500CQC25701466530; 2025-04-01 / 2028-03-31

These selected rows go beyond cast-resin SCB equipment and are not a complete certificate list. Each certificate covers only the 10 kV models listed in it; ask for a separate certificate for SCB, 20 kV or ZQSCB units.

One additional oil-filled entry, CQC19701220650, prints S-M-250/10-NX1 alongside the parenthetical S20-M-250/10-NX1, while the neighbouring ratings use S22-M. Ask for the original certificate and annex if the proposed 250 kVA oil-filled unit relies on this record.

References: [6]

05

Request test reports for the offered configuration

Daqo’s download centre lists an ASTA transformer type-test certificate under a ‘35kV’ title, dated 5 January 2026 on the listing. The downloadable scan instead identifies SCB10-3150/11: 3,150 kVA, 11,000/433 V, 50 Hz, AN and Dyn11. Match your offer to the tested unit, not to the list title.

The scan is ASTA-TYPE-0001724, project SHA973669, dated 21 April 2022, referencing test report 202201241 and specified IEC 60076-11:2018 clauses. It names Nanjing Daqo as applicant and manufacturer. The downloaded file contains only the page marked ‘Page 1 of 4’; it supplies neither the complete annex nor the underlying report. No expiry date is printed on this page. Request the full certificate and report to establish tested scope.

For SCB equipment, specify guaranteed no-load and load losses with reference temperature, partial-discharge acceptance, impedance tolerance, enclosure, cooling and temperature monitoring. For ZQSCB, add the converter interface and rectifier duty. Agree which document is an existing type-test report and which routine tests will accompany each supplied serial number.

Use the existing product records below for additional configuration context and the platform’s test-report and loss-comparison guides for document checks. Keep a corporate management certificate, product certificate and laboratory report as separate items in the acceptance schedule.

References: [1] [2] [3] [6] [8] [9]

Copper foil coil on a winding machine with insulation sheets and workshop tools
Copper-foil winding workstation.

EXISTING CATALOGUE RECORDS

Explore the product detail

Use each product record to review the published configuration, then request the proposed specification for your project.

SCB 10 kV dry-type transformer series

SCB12 / SCB14 / SCB18

ZQSCB traction rectifier transformer series

ZQSCB

SCB 20 kV dry-type transformer series

SC(B)12 / SC(B)14 / SC(B)18

Product documents

BEFORE YOU REQUEST A QUOTATION

A project brief the factory can respond to

Use this list to prepare your requirements. Checking an item only marks your preparation on this page.

0 of 6 items prepared

Prepare an RFQ for DAQO

Questions buyers ask

Are the 2022 dry-type certificate dates still the latest records?

No. The April 2025 CQC bulletin lists the same eight dry-type numbers with effect from 1 April 2025 and validity to 31 March 2028. Confirm current status and the model annex for the actual order.

Does the certificate table cover every 20 kV or traction transformer?

The selected bulletin records are 10 kV model groups. Use a certificate and test report matching the proposed 20 kV or ZQSCB design.

What does the 20 kV 25,000 kVA figure mean?

It is one of two capacity blocks on the manufacturer’s page. The page does not map all ratings to both voltage pairings; request the selected model’s approved schedule.

Can the catalogue descriptions establish an operating-cost comparison?

Obtain the proposed design’s numerical no-load and load losses, reference temperature and tolerances, then compare the same duty using the loss-cost calculator.

Before ordering, confirm in writing with the manufacturer: the certificate number and annex for your exact model, its current status, and the full type-test report. Images are generic illustrations.

Sources

9 sources · checked 4 November 2026

Prepared by PowerTransformerB2B. Checked 4 November 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] SCB 10 kV catalogue, unversioned websiteDaqo Group · Manufacturer original
  2. [2] SCB 20 kV catalogue, unversioned websiteDaqo Group · Manufacturer original
  3. [3] ZQSCB traction rectifier catalogue, unversioned websiteDaqo Group · Manufacturer original
  4. [4] Nanjing Daqo legal-entity recordWeihai Public Resources Trading Center · Public enterprise record
  5. [5] Nanjing transformer industry report, 27 February 2026Nanjing Municipal Government · Dated government report
  6. [6] April 2025 certificate bulletin, PDF pages 39–42China Quality Certification Centre · Issuer bulletin
  7. [7] June 2022 certificate bulletin, PDF pages 57–59China Quality Certification Centre · Historical issuer bulletin
  8. [8] Transformer certificate download listing, dated 5 January 2026Daqo Group · Manufacturer download listing
  9. [9] ASTA-TYPE-0001724 scan, page marked 1 of 4; SCB10-3150/11Intertek/ASTA; manufacturer-hosted copy · Incomplete certificate copy
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