BOPP Insulation Submersible Motor Winding Wire/Submersible Pump Wire

Construction of BOPP Insulated Submersible Winding Wire

The BOPP submersible winding wire employs a triple-wrapped film insulation system built directly over the copper conductor. The conductor is manufactured from high-conductivity bright annealed copper, available in solid or stranded configurations with diameters ranging from 0.60 mm to 1.90 mm . The bright annealed copper offers lower resistance, accurate dimensional control, and excellent surface finish with high elongation .

The insulation consists of three sequentially wrapped film layers. The first layer, applied directly over the copper conductor, is polyester film. This layer establishes the foundation for the insulation system, providing excellent adhesion to the conductor and contributing high dielectric strength at the interface where electrical stress is most concentrated. The second layer is biaxially oriented polypropylene (BOPP) film. BOPP film is produced by stretching polypropylene in both longitudinal and transverse directions, a process that aligns the polymer molecular chains along the plane of the film and dramatically improves its tensile strength, dielectric strength, and barrier properties . The third and outermost layer is another BOPP film layer, providing additional dielectric protection and a smooth surface finish for ease of winding.

After all three films are wrapped helically over the conductor, the assembly passes through an in-line continuous heat shrinkage furnace. This thermal treatment seals the overlapping film edges together and shrinks the films tightly around the conductor, forming a cohesive, void-free insulation system. The poly wrapped wires have replaced traditional PVC wires for their superior performance in various aspects, including less water absorption coefficient, higher temperature withstand, and lower leakage current .

The finished BOPP winding wire offers several advantages: high dielectric strength, low leakage strength, tear resistance, higher tensile strength, abrasion resistance, and the ability to work at higher temperatures up to 150°C . The BOPP composite insulation demonstrates significant advantages in both cost and performance. In terms of production cost, the consumption of insulation materials per unit length is significantly reduced, and the simplified production process effectively reduces energy consumption and labor costs . In terms of water resistance, the BOPP and polyethylene combination is a material with low water absorption, which can maintain stable insulation performance over the long term .

Pumps Suitable for BOPP Winding Wire Repair

BOPP insulated winding wire is particularly suited for the rewinding and repair of specific types of submersible pumps operating in Vietnam‘s diverse water conditions.

Deep well submersible pumps represent the primary application for BOPP winding wire repair. In agricultural irrigation projects and rural drinking water sources, deep well pumps often need to be placed tens or even hundreds of meters below the groundwater level. This working condition has several strict characteristics: first, high water pressure increases by approximately 1 atmosphere for every 10 meters of depth. High pressure and depth force water molecules to penetrate into the micropores of the insulation layer. Second, the water quality is mainly hard water or groundwater with high sediment content, which places certain requirements on the abrasion resistance of the insulation layer. Third, the pump body often needs to operate continuously for long periods, and during high-temperature periods in summer, the well water temperature can rise to 30-40 degrees, further exacerbating insulation aging .

A practical example from Vietnam demonstrates the effectiveness of BOPP insulation in these conditions. A deep well submersible pump with a submergence depth of 80 meters and a rated power of 22 kW used modified polypropylene insulated winding wire (BOPP+PE product). After two years of continuous operation and disassembly testing, the insulation resistance remained stable above 300 megaohms (in water at normal temperature), far exceeding the standard requirement of 50 megaohms .

Industrial and municipal submersible pumps used for drainage, flood control, and wastewater management are also suitable for BOPP winding wire repair. The wire’s resistance to water absorption and its ability to withstand higher temperatures make it appropriate for pumps that operate continuously in challenging environments.

Rewindable submersible motors are specifically designed to be repaired rather than replaced when electrical failure occurs. The BOPP insulation system is compatible with the rewinding process, allowing motor repair workshops in Vietnam to restore failed motors to working condition. The 6-inch rewindable submersible motors available in Vietnam, such as those supplied by Hung Viet Electronics, feature motor designs that support rewinding, with some models using PPC winding insulation for standard applications and PE2/PA insulation for higher temperature requirements .

BOPP Winding Wire Application in Vietnam

Vietnam‘s pump market has experienced significant growth driven by industrialization, urbanization, and agricultural modernization. The demand for high-quality, stable-operating, and energy-efficient pumps has become a pressing issue for businesses across water treatment, chemicals, mining, and construction materials production .

Domestic manufacturing and repair infrastructure supports the application of BOPP winding wire in Vietnam. Motor rewinding services for submersible pumps are widely available, with specialized workshops offering repair services for burned motors. These services address the common failure modes of submersible pumps, including burned windings caused by voltage fluctuations, phase loss, and water ingress . The cost of rewinding a submersible pump motor depends on the extent of damage, the type of motor (single-phase or three-phase), and the quality of materials used, including the copper wire and insulation materials .

Minhmotor, a Vietnamese pump and motor manufacturer with over 50 years of history, produces water pumps with power capacities from 5HP to 50HP for applications including clean water pumping, drainage, flood control, domestic water supply, chemicals, and high-pressure pumping . The company uses high-grade, heat-resistant copper wiring (grade F) in its motor products, demonstrating the Vietnamese market’s awareness of insulation quality requirements for submersible applications . Minhmotor operates an integrated ecosystem as the third largest electric motor manufacturer in Vietnam, with a nationwide network of branches and dealers in Hanoi, Ho Chi Minh City, Da Nang, and Hai Phong, providing warranty and repair services .

International pump brands distributed in Vietnam, including EBARA and others, utilize submersible motor designs that require reliable insulation systems. The available rewindable motors in Vietnam support multiple winding insulation options, including PPC (polyester/polypropylene composite) and PE2/PA for higher temperature applications, allowing repair facilities to select the appropriate wire based on the specific operating conditions of each pump .

Water quality considerations in Vietnam favor BOPP insulation for submersible pumps. Groundwater in many regions contains high mineral content and sediment, which can accelerate insulation degradation in lesser wire types. The BOPP film’s hydrophobic properties and resistance to water absorption address these challenges, maintaining dielectric performance even under prolonged immersion .

Cost Advantages

The BOPP insulation construction offers significant cost advantages for submersible pump motor repair and manufacturing in Vietnam. The primary advantage derives from the efficient film-wrapping manufacturing process, which reduces material consumption per unit length and simplifies production, effectively lowering energy and labor costs, resulting in a comprehensive cost reduction of approximately one quarter compared to some alternative constructions .

From a repair perspective, the BOPP wire’s compatibility with standard rewinding procedures ensures that motor repair workshops can use the wire without specialized equipment or extensive retraining. The wire’s high dielectric strength and low leakage current reduce the risk of repeat failures, minimizing warranty costs and customer downtime.

For end users, the extended service life provided by BOPP insulation translates to lower total cost of ownership. The wire’s ability to maintain insulation resistance above 300 megaohms after two years of continuous operation in deep well conditions  demonstrates the long-term reliability that reduces replacement frequency and maintenance costs.

Conclusion

BOPP insulated submersible motor winding wire provides a technically sound and cost-effective solution for water-filled submersible motors in Vietnam. The triple-layer polyester and BOPP film construction delivers high dielectric strength, water resistance, and thermal capability up to 150°C . The wire is particularly suited for repairing deep well submersible pumps, industrial drainage pumps, and rewindable submersible motors operating in Vietnam’s challenging water conditions. Vietnamese pump manufacturers and repair facilities, supported by established motor rewinding infrastructure , can utilize BOPP winding wire to restore failed motors to reliable service. As Vietnam’s demand for efficient water management systems continues to grow, BOPP insulated winding wire represents a practical choice for both original motor manufacturing and repair operations.