What certifications does the product have?

The product has CE certification. The company also holds ISO9001:2015, ISO14001, and ISO45001:2018 management system certifications.

What is the connection group symbol?

The transformer uses the Dyn11 connection group to reduce harmonic effects and improve power quality.

Bok Three Phase S11 Fully Sealed Oil Immersed Power Distribution Transformer

Name: Bok Three Phase S11 Fully Sealed Oil Immersed Power Distribution Transformer
Brand: Bokong Electric Co., Ltd.
SKU: 2216045555

Zhejiang, ChinaBokong Electric Co., Ltd.

US$200.00

1 Piece

Product profile

Customization

Available

Application

Power

Phase

Three

Model NO.

S11-M-200/10

Core

Core-type Transformer

Cooling Method

Dry-type Transformer

Winding Type

Two-winding Transformer

Certification

ISO9001-2000, ISO9001, CCC

Usage

Single-phase Transformer, Rectifier Transformer, Combined Transformer, Power Transformer, Distribution Transformer

Frequency Characteristics

Power Frequency

Shape of Core

Brand

Bokong / OEM

Transport Package

Wooden

Trademark

BOK

Origin

China

Production Capacity

5000 Pieces/Year

Key features

Fully Sealed Structure: Eliminates oil tank, prevents oil degradation and insulation aging, extending service life.

Low Noise Design: Uses imported cold-rolled silicon steel sheets and binding to reduce operating noise.

High Conductivity Windings: High and low voltage windings made of oxygen-free copper for stability.

Harmonic Reduction: Dyn11 connection group significantly reduces adverse effects of harmonics on power grid.

Short-Circuit Resistance: Excellent design with low axial force coils and high reliability support structure.

OEM/ODM Service: Supports customization from designs, samples, and flexible minor customization.

100% Quality Inspection: Finished products undergo visual and function inspection by 7 QA/QC inspectors.

Fast Lead Time: Average lead time within 15 workdays for both peak and off-season periods.

Company profile

Years of Export ExperienceImporters and ExportersHigh Repeat Buyers ChoiceExhibition Experience

Bokong Electric Co., Ltd.

Zhejiang, China

CertifiedBusiness Type: Manufacturer/Factory & Trading Company CertifiedR&D Capacity: ODM Service Available & OEM Service Available CertifiedCustomization Options: Customization from Samples, Customization from Designs, etc. CertifiedExport Year: 14 Years CertifiedNearest Port: Ningbo PortAverage Response Time: ≤15h

AI-Powered supplier vetting

SummaryBokong Electric Co., Ltd. is a China-based limited company established in 2011 and located in Yueqing, Zhejiang. It is described as a technology-based enterprise engaged in the research, production, sales, and service of power transmission and transformation equipment rated at 35KV and below. Its offerings include transformer substations, switchgear, ring main units, and distribution cabinets. The supplier reports ISO9001:2015 and ISO14001:2015 certifications and 14 years of combined R&D engineer experience. Its products are stated to be used by domestic power companies, power stations, petroleum and chemical enterprises, factories, mining businesses, and real estate projects. An SGS audit record is provided with validity from July 10, 2025 to July 9, 2026, but the audit result is not interpretable from the coded value supplied. Outsourcing, inventory, overseas services, OEM/ODM, SDK, quality assurance, traceability, and related capabilities remain unknown. No financial data is included in this assessment.

Supplier typeThe supplier is identified as a limited company and a trade company in the manufacturing industry. Its stated operations include R&D, production, sales, and service of power transmission and transformation equipment rated at 35KV and below, indicating a combined trading and industrial-business profile.

CertificationsThe supplier reports ISO9001:2015 and ISO14001:2015 certificates. An SGS audit record is also listed as valid from July 10, 2025 to July 9, 2026, although the supplied coded audit result cannot be interpreted as pass or fail.

After-Sales capabilityThe supplier explicitly claims comprehensive after-sales service and says its products have received unanimous praise from users. However, no specific service process, response standard, service coverage, or overseas support capability is provided.

R&D capabilityThe supplier describes itself as technology-based, engaged in R&D, and continuously increasing technology investment. It also reports 14 years of combined R&D engineer experience, but specific new-product results, patents, or technical performance evidence are not provided.

Production capacityThe supplier states that it conducts production of power transmission and transformation equipment up to 35KV, and its primary products include substations, switchgear, ring main units, and distribution cabinets. Outsourcing procedures, manufacturing contracts, inventory capacity, and related operational capabilities are marked unknown, so production scale and fulfillment capacity cannot be fully evaluated.

Client casesThe supplier states that its products are used by domestic power companies, power stations, petroleum and chemical enterprises, factories, mining businesses, and real estate projects. These are described as industry applications, but named customers, project details, and verifiable case documentation are not provided.

Product Q&A

Q:What is the warranty period?

The provided text does not specify a warranty period. Please contact the manufacturer for specific warranty terms.

Q:What is the minimum order quantity?

The minimum order quantity is 1 set.

Q:What are the payment terms?

Payment terms include LC (Letter of Credit) and T/T (Telegraphic Transfer).

Q:Can the transformer be customized?

Yes, OEM and ODM services are available. Customization options include designs, samples, full customization, minor customization, and flexible customization.

Q:What is the average lead time for production?

The average lead time is within 15 workdays for both peak season and off-season.