Factory Tour
Step inside Jiangyin Spark's 6,000 m² state-of-the-art facility. From incoming raw materials to global shipment, every stage is governed by rigorous 5S standards, full-process quality control, and a culture of safety and precision.
10-Step Manufacturing Process
Every current transformer leaving our facility passes through a rigorous, fully documented production journey -- ensuring consistent accuracy, safety, and reliability.
Incoming Quality Control (IQC)
All incoming raw materials and components undergo mandatory pre-storage quality inspection. Trained QC inspectors rigorously screen appearance, dimensional tolerances, and electrical parameters -- ensuring zero defective materials enter the production line. Quality is controlled at the source.
Raw Material Warehouse -- 5S Storage
Approved materials enter a dedicated raw material warehouse, organized by category with clear labeling and 5S-compliant placement. Humidity and dust control systems are active at all times. A strict FIFO (First-In, First-Out) policy ensures material freshness and traceability throughout the supply chain.
Professional Winding Workshop
Our dedicated winding workshop features standardized workstations equipped with precision automated winding machines. Coil turns, wire tension, and winding flatness are tightly controlled to ensure stable electromagnetic parameters and high consistency across every transformer produced.
Assembly & Soldering Process
Skilled technicians assemble each product strictly according to production drawings and work instructions. Precision soldering operations are performed with controlled temperature profiles, ensuring reliable electrical connections, correct lead wire polarity (White = Positive, Black = Negative), and consistent workmanship across every unit.
Semi-Finished Product Testing
Before proceeding to encapsulation, every semi-finished unit undergoes a dedicated intermediate electrical performance test. Continuity, phase angle error , and ratio error are verified against specification limits -- catching any winding or assembly defects early and preventing non-conforming units from advancing further down the production line.
Ultrasonic Welding / Epoxy Encapsulation
Depending on product type, units undergo either ultrasonic welding for a secure, hermetic housing bond, or epoxy encapsulation for superior environmental protection. Both processes ensure the finished case achieves UL 94V-0 flame-retardant compliance, 3.0 kV withstand voltage, and robust protection against moisture and vibration.
100% Electrical Performance Testing
Every single finished unit is tested individually -- no sampling, no exceptions. Core parameters including ratio error and phase angle error are measured and recorded for full traceability. Only units meeting the specified accuracy class (0.5% or 1.0%) are passed for the next stage.
Labeling / Marking · Visual Inspection · Packaging
Passed units receive laser marking or label application with full product identification. Prior to packaging, each unit undergoes a manual visual appearance inspection by trained inspectors. Products are then packaged according to customer specifications -- custom inner packaging, carton labeling, and shipping marks applied per order requirements.
OQC Sampling Inspection & Zoned Warehouse Storage
Before warehousing, finished goods undergo a strict outgoing quality control (OQC) sampling inspection per AQL standards -- accuracy testing, withstand voltage testing, parameter verification, appearance review, and packaging conformance checks. Approved goods are stored in a clean, organized warehouse, segregated by model, specification, and batch number for fast, accurate order fulfillment.
Global Logistics & Shipment
Finished goods are ready for worldwide dispatch via multiple logistics options. Whether your project requires express courier for urgent samples or full sea freight for large orders, Jiangyin Spark's location near Shanghai port ensures fast, cost-effective global delivery with full documentation support.
End-to-End Quality Assurance at a Glance
Our integrated quality system covers every stage -- from raw material to your door.
Certified Quality You Can Trust
Jiangyin Spark holds multiple international certifications covering product safety, environmental management, and occupational health. Our UL 2808 listing (E498920) is recognized by global electrical inspectors and procurement teams worldwide.
Ready to Start Your Order?
Share your specifications -- input current, output type, lead wire length, and terminal requirements -- and our engineering team will recommend the most suitable model with a competitive quote within 24 hours.