300 KVA Dry Type Transformer

300 kVA Dry Type Transformer - IEC 60076-11 Compliant, H-Class Insulation, Engineered for Reliable Indoor & Load-Center Power Distribution

CHBEB manufactures the 300 kVA dry type transformer at our own production facilities in Zhejiang and Jiangsu, China, on an epoxy resin vacuum-casting line that has supplied grid operators including State Grid and China Southern Power Grid. Every unit is custom-built to your voltage class, frequency, and enclosure requirements, and ships with a full factory test report. Whether you're an EPC contractor sourcing for a commercial building, a distributor stocking standard ratings, or a utility engineer specifying for a substation retrofit, this page gives you the technical data, certifications, and delivery terms you need to qualify us as a supplier.

We do not sell 300 kVA as a one-size-fits-all catalog item - voltage combination, tap changer configuration (OLTC/NLTC), noise level target, and terminal arrangement are all confirmed with your engineering team before production drawings are released.

Unlike listings that stop at a spec sheet, every 300 kVA unit passes through documented stages our team can walk you through with photos or a live video call:
• Winding & core assembly - copper/aluminum coils wound to tolerance, core stacked to ±0.02mm lamination precision under JB/T 501 process control.
• Epoxy resin vacuum casting - the defining step for dry type units: windings are cast under vacuum to eliminate voids, then cured to reach H-Class thermal rating.
• Assembly & pre-test - enclosure fitting, terminal connection, and insulation resistance checks before the unit enters final test.
• Full-batch electrical testing - no-load loss, load loss, and dielectric checks are logged for every single transformer, not a sampled batch, and issued as a signed report referencing the unit's own serial number.
• Export packaging & loading - moisture-protective wrapping and shock/tilt indicators available for units heading to port, with documented loading procedures for oversized cargo.
We can provide production-stage photos or arrange a remote video walkthrough of your specific order at the Yueqing (Zhejiang) or Nanjing (Jiangsu) facility.

5000 kVA dry type transformer installed in an underground metro

substation powering traction systems.

Our management systems and product marks cover quality (ISO 9001), environmental performance (ISO 14001), and workplace safety (ISO 45001), alongside product-safety marks recognized across European, Chinese, and CIS markets - the full certificate set is listed in the specification table above.

• Third-party test & inspection: rather than relying on our own lab results, we submit units to independent laboratories in the Netherlands and China for verification, and select models carry an additional endorsement from the national transformer testing authority.
• Design standards: IEC 60076 series, IEEE C57.12.91 (dry type test procedures)
• R&D backing: In-house R&D team of 15+ engineers (20%+ hold master's/PhD degrees), reinvesting 5–7% of annual revenue into product development
• Patent portfolio: 5 invention patents and 120+ patents in total across the CHBEB product line

Certificate copies and third-party test report references are available on request during the quotation process - we can send scanned certificates directly to your procurement or QA team for pre-qualification.
 

• Warranty coverage: the complete transformer is protected for 3 years, with an additional 2-year window on individual components, and our engineers remain reachable for maintenance guidance for the working life of the unit.
• Factory Acceptance Test (FAT): every order is closed out with a witnessed pre-shipment test; if you can't attend in person, we run it over live video instead.
• Quality Control: Dedicated QC team of 30+ staff, 200+ hours of specialized training per year, CNAS-standard certified
• Reliability Track Record: field data across our installed base shows an annual failure rate under 0.05%, and our insulation systems have been run continuously for 1,000 hours at 95°C without breakdown
• Manufacturing Footprint: 3 production bases (Yueqing x2, Nanjing) plus Beijing R&D center, 100+ acres total site area
• Corporate Transparency: Registered capital of RMB 218,000,000; HQ at No. 3 Rongjing East Road, Beijing Economic-Technological Development Area, Beijing, China

We list our factory address and manufacturing site details openly because buyers making a large, one-time capital purchase deserve to verify who they're dealing with before wiring a deposit.

Request a technical datasheet and quotation for your 300 kVA dry type transformer specification - include your required voltage class, frequency, and installation environment, and our engineering team will confirm feasibility and lead time within one business day.