Submersible motors operate in harsh downhole conditions characterized by high temperatures and pressures, exposure to corrosive oil and gas, and high-frequency vibrations. Standard copper wires often suffer from insulation failure, aging, and damage, leading to motor malfunctions and increased operational costs—major challenges for oilfield equipment operations.
To address these industry pain points, TST Cable has developed a specialized polyimide-insulated round copper wire. Combining high-temperature resistance, corrosion resistance, high dielectric strength, and fatigue resistance, it is perfectly suited for extreme downhole environments. It effectively eliminates operational risks and ensures the long-term, stable performance of submersible motors.
Four Core Strengths Outperforming Traditional Wires
Premium Materials:
Resistant to heat, oil, and corrosion; stable in extreme environments
Utilizes high-dielectric, heat-resistant, and oil-resistant polyimide materials. It withstands high temperatures, oil contamination, and corrosive oil/gas without compromising insulation performance under harsh conditions, fundamentally enhancing equipment reliability.
Advanced Manufacturing:
High-pressure extrusion for a dense, seamless, and reliable finish
High-pressure extrusion process ensures precise control over insulation thickness and high concentricity
Single-pass extrusion creates a dense, seamless insulation layer, significantly boosting dielectric strength and stability
Eliminates issues common to traditional wrapped insulation, such as interlayer defects, dielectric breakdown, and leakage
Optimized Structure:
Lightweight and efficient; simultaneous cost reduction and performance enhancement
Thinner insulation layer increases slot fill factor and power density
Reduced conductor size facilitates equipment lightweighting and lowers costs
Seamless structure enhances wear and scratch resistance, improves heat dissipation, and provides superior moisture and seepage resistance
Ultra-long Service Life:
Flexible and durable; low maintenance for peace of mind
Uniform insulation with excellent adhesion; the wire is flexible and bend-resistant. It ages slowly and evenly, significantly extending service life—ideal for long-term operation in downhole and specialized applications where maintenance is difficult. Rigorously Tested for Peak Performance
Temperature Resistance: Stable operation at 260°C; no softening or dielectric breakdown at 450°C for 2 minutes.
Voltage Resistance: Insulation thickness of 0.12–0.30mm; withstands up to 10,000V; peak breakdown voltage reaches 23,000V.
Oil & Water Resistance: Breakdown voltage retention ≥80% after testing; insulation remains crack-free.
Abrasion Resistance: Withstands up to 20,000 scrape cycles under 7N pressure.
Flexibility: No cracking during winding, twisting, or thermal shock tests; continuous insulation free of pinholes.
Specifications: Conductor diameter 1.500–5.000mm; suitable for various motor types.
Applications
✅ Submersible motor stator/rotor windings
✅ Oil-filled specialty motors and submersible motors (Class H and below)
✅ Insulated cores for submersible pump cables
✅ Cable insulation for high-temperature, high-humidity, and oily environments
✅ High-power-density motor systems
✅ Downhole or specialty electrical equipment requiring long-term operation and minimal maintenance
Why Choose TST Cable?
Quality assured through compliance with multiple authoritative standards
Breakthroughs in both materials and manufacturing processes address key pain points of traditional wiring
Rigorously validated performance suitable for extreme conditions, such as deep-sea and deep-well environments
Long service life and low maintenance requirements reduce total lifecycle costs
For deep-sea oil extraction and extreme operating conditions, choosing the right cable safeguards both safety and profitability. TST Cable’s specialty PI-insulated copper round wire for submersible motors—featuring high reliability, high voltage resistance, longevity, and lightweight design—is the premier choice for windings in submersible motors and specialty equipment, laying a solid foundation for the continuous, stable operation of energy infrastructure.
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