Our Factory

The Starting Point of Safety and Quality

Every switchgear, every transformer, and every prefabricated substation originates here, destined for power grids, factories, communities, and renewable energy plants. Here, we embody the most basic practice of "reliability."

Factory Overview

Our production base is located in Shandong, China, nestled at the foot of Mount Tai. With a beautiful environment and convenient transportation, it is a new type of joint-stock company established according to modern enterprise systems. The total area is over 100 acres, including a 26,000-square-meter manufacturing workshop. We currently have 280 employees, of whom over 30% are senior technicians with more than ten years of industry experience.

• Huihai's annual production capacity: 50,000 sets of low-voltage complete sets of equipment, 4,000 sets of high-voltage switchgear, and 500 prefabricated substations, with an annual output value of US$300 million.
• Huihai's main product lines: power transformers, prefabricated substations, high-voltage switchgear, low-voltage switchgear, ring main units, etc.
• Coverage: Products cover Asia, Europe, America, and Africa, and have even reached Antarctica and other regions through scientific research and engineering projects.

Manufacturing Strength – Equipment Guarantees Precision

Huihai firmly believes that good equipment is the foundation of high quality. In recent years, it has invested hundreds of millions of yuan in equipment upgrades, achieving full CNC and automation in key processes.

Equipment Name	Brand/Specifications	Core Function
CNC Turret Punch Press	Yawei	Sheet metal processing accuracy ±0.1mm, 3x increase in production efficiency
Fiber Laser Cutting Machine	3kW~6kW	Precision cutting of carbon steel, stainless steel, and aluminum-zinc coated sheets, narrow kerf, burr-free
CNC Bending Machine	100 tons~300 tons	One-time bending forming, angle error <=±0.5o
Fully Automatic Busbar Machining Center	Three-station (punching, shearing, bending)	Automated copper busbar processing, good consistency, no need for secondary grinding
Robotic Welding Workstation	6-axis articulated arm	Uniform welds on transformer substation housings and cabinet structures, minimal deformation
Electrostatic Spraying Production Line	Automatic spray gun + high-temperature curing oven	Coating thickness 60~80μm, salt spray test ≥500 hours
Vacuum Pressure Impregnation Equipment	Dedicated for Dry-Type Transformers	Ensures complete coil impregnation, low partial discharge, and high withstand voltage

The workshop strictly implements 6S on-site management (Sort, Set in order, Shine, Standardize, Sustain, Safety), ensuring unobstructed passageways, fixed material placement, and clear labeling, providing a high-quality environment for safe production and efficient flow.

Full-Process Quality Control – The Gatekeeper from Incoming Materials to Outgoing Products

Huihai has established a multi-level quality inspection system of "self-inspection + mutual inspection + specialized inspection," equipped with a central laboratory and mobile testing equipment.

Incoming Quality Control (IQC)

• All steel, copper, and components (circuit breakers, contactors, integrated protection devices, instruments, etc.) undergo random sampling for appearance, dimensions, material certification, and performance testing before warehousing.
• CCC certificates and validity periods for key components are strictly verified to ensure compliance at the source.

In-Process Quality Control (IPQC)

• First-piece inspection for sheet metal processing: The first piece after punching, cutting, and bending is inspected; only after passing inspection can mass production begin.
• Wiring Procedure: Secondary wiring must be checked point by point against the drawings. Wire numbers should be printed using a wire marking machine to prevent incorrect or missing connections.
• Busbar Fabrication: Copper busbar lap surfaces should be tin-plated or coated with conductive paste. Tightening torque should be performed according to standards. After completion, the circuit resistance should be measured.

Finished Product Inspection (FQC)

• 100% of main circuit power frequency withstand voltage, insulation resistance, and auxiliary circuit energization tests are conducted before shipment.
• Equipped with professional equipment such as high-voltage switch characteristic testers, circuit resistance testers, turns ratio testers, and partial discharge detectors.
• For prefabricated substations, complete transmission, temperature rise simulation, and protection level spot checks are also required.

Simulation Test Laboratory

• Capable of simulating normal/fault conditions at voltage levels of 10kV and below to verify new products and special projects.
• Type test reports are issued and archived to ensure traceability for each batch of products.

Flexible Production and Just-in-Time Delivery

Tight project schedules and non-standard requirements are common in the power industry. Huihai's production scheduling system, relying on ERP, enables automatic order scheduling, material demand planning, and progress tracking.

• Standard Cabinet Types: 5-7 days from task assignment to warehousing.
• Non-standard Customization: 10-15 days after technical briefing (including drawing design, sheet metal customization, and component assembly).
• Emergency Orders: 48-hour express delivery (some semi-finished cabinets in stock) can be achieved through a green channel.
• Simultaneously, a safety stock area is established: 15 days' worth of commonly used circuit breakers, contactors, instruments, and cabinet components are stocked to ensure uninterrupted supply chain operations.

Green and Safe – Responsible Production

• Environmentally Friendly Coating: Utilizing electrostatic powder coating technology, with no VOC emissions; wastewater is treated to meet standards and then recycled.
• Energy Saving and Consumption Reduction: A photovoltaic power generation system is installed on the workshop roof, generating approximately 200,000 kWh of green electricity annually, accounting for 50% of the plant's total electricity consumption.
• Safety in Production: Certified as a Level 3 Safety Production Standardization Unit, regularly conducts fire drills and special equipment training, and has been recognized as a model safety factory annually.
• Noise Control: High-noise equipment is housed in separate enclosures equipped with silencers; noise levels at the factory boundary meet local standards.

Conclusion

Every tightened screw, every busbar connection, every withstand voltage test is a testament to our commitment to "electrical safety." There are no shortcuts here, only meticulous attention to detail. Our factory becomes more meaningful because of your trust.