Power Cable for High-Power Variable Frequency Drive (VFD Cable)

Product Introduction

High-power variable frequency drive cable (VFD cable) is a dedicated symmetric shielded power cable connecting variable frequency inverters and variable frequency motors, designed for high-frequency PWM modulation operating conditions. The standard rated voltage is 0.6/1kV, while high-power high-voltage versions adopt 1.8/3kV & 3.6/6kV. It complies with GB/T 12706, GB/T 19666, IEC 60502, VDE 0250 and UL 2277 industrial standards. Main models: BPYJVP, BPYJVP2, armored BPYJVP23, LSZH flame retardant WDZ-BPYJYP. The optimal construction is 3+3 symmetrical equal-core structure (3 phase power cores + 3 evenly distributed grounding cores), different from conventional 4-core power cables. It addresses typical defects caused by inverter high-frequency PWM waveforms: dv/dt voltage spikes, traveling wave reflection, high-order harmonics, common-mode electromagnetic interference. Ordinary YJV cables suffer premature insulation breakdown, motor bearing electrical corrosion, control instrument malfunction and excessive motor noise after long-term operation. With symmetrical layout, double shielding and pulse-resistant XLPE insulation, this cable ensures stable long-term operation of high-power drive systems, widely applied in metallurgical rolling mills, mine hoists, port cranes, large water pumps & fans, wind power and chemical heavy-duty transmission fields.

Internal Structure (Inner to Outer)

1. ConductorClass 2 compact stranded bare copper for fixed high-power installation; Class 5 finely stranded tinned flexible copper for drag chain & frequent moving occasions. Low resistivity ensures sufficient current carrying capacity and controlled temperature rise under heavy load. In 3+3 design, 3 grounding cores are evenly spaced at 120° to realize fully symmetrical spatial impedance and eliminate circulating current noise.

2. XLPE Cross-linked Polyethylene Insulation (Pulse Resistance Core)Ultra-clean XLPE features ultra-low dielectric loss, withstands instantaneous PWM pulse voltage (peak 3~5 times rated voltage), excellent corona resistance and partial discharge suppression, avoiding insulation aging breakdown induced by repeated high-frequency surges. Continuous operating temperature: 90℃; short-circuit withstand temperature ≤250℃ within 5s.

3. Cabling & FillerElastic flame-retardant filler fully fills gaps to maintain round cable shape, balance three-phase impedance and reduce capacitive coupling crosstalk between cores.

4. Double Composite Shielding (Core of EMC Performance)

• Inner layer: fully wrapped aluminum-polyester foil tape to block transverse capacitive coupling interference;

• Outer layer: high-density tinned copper wire braided shield (coverage ≥90%), providing low-impedance return path for common-mode current, restrain outward electromagnetic radiation and resist external noise intrusion. Additional copper tape overall shield is optional for extreme heavy interference environments.

5. Inner Sheath (Optional)Extruded PVC/LSZH liner isolates shielding layer and armor for moisture resistance and buffering.

6. Steel Tape Armor (BPYJVP23, Direct Burial & Heavy Duty)Double steel tape lapped armor delivers compression resistance, impact resistance and rodent protection against underground soil extrusion and heavy mechanical impact.

7. Outer SheathStandard: Oil-resistant & wear-resistant PVC; Fire safety grade: LSZH low-smoke zero-halogen flame retardant; Chemical resistant: modified polyolefin; with excellent waterproof, oil-proof, acid/alkali mist and weather aging resistance.

Core Performance Advantages

1. Optimized 3+3 Symmetrical Layout for Perfect Electrical Balance

3 phase cores plus 3 grounding cores arranged uniformly at 120°, realizing consistent inductance, capacitance and wave impedance across three phases. It drastically suppresses traveling wave reflection, common-mode voltage and bearing current, fundamentally mitigating motor bearing corrosion, vibration and abnormal noise, far superior to asymmetrical 4-core cables.

2. Outstanding Pulse Voltage Withstand Capacity

Resists steep dv/dt voltage surges of PWM modulation; partial discharge test voltage is 40% higher than ordinary power cables. No premature insulation aging occurs for wiring length ≤100m, eliminating unexpected shutdowns of high-power systems.

3. Premium EMC Electromagnetic Compatibility

Closed-loop grounded double shielding achieves shielding efficiency ≥90dB within 1MHz~30MHz frequency band. It prevents inverter harmonics from disturbing encoders, PLC, sensors and precision instruments, meanwhile resisting external electromagnetic noise to guarantee accurate operation of automated closed-loop control systems.

4. Wide Environmental Adaptability

• Temperature range: -30℃ ~ 90℃ for fixed installation, transient peak 105℃;

• Resistant to machine oil, cutting fluid, weak acid/alkali and humid vapor; armored type suits direct burial in chemically corrosive industrial soil;

• LSZH variant generates minimal smoke and zero toxic hydrogen halide gas during combustion, ideal for tunnels, underground corridors and enclosed workshops with strict fire codes.

5. Stable High-Power Current Transmission

Compact stranded conductor reduces skin effect and high-frequency power loss; large cross-section specifications (95/150/240/300mm²) support power transmission for hundreds of kW to MW-level variable frequency motors.

Application Scenarios

1. Heavy industry high-power transmission: main drive systems of steel hot/cold rolling mills, mine main hoists and belt conveyors;

2. Large fluid equipment: centrifugal water pumps, boiler induced draft fans, air compressors and central air-conditioning chillers;

3. Port lifting machinery: shore container cranes, gantry cranes traveling & hoisting frequency conversion power wiring;

4. New energy & wind power: cabin generator inverter outlet cables and energy storage converter power cables;

5. Production lines for chemical, papermaking and printing industries;

6. Ventilation & smoke exhaust fans in tunnels, underground utility tunnels and subways;

7. Long-distance wiring and automated production lines with complex electromagnetic environments.