66kV–110kV Fully Prefabricated Straight-Through Cable Joint
The 66kV–110kV Fully Prefabricated Straight-Through Cable Joint is designed to seamlessly splice two high-voltage cables of the same voltage rating. Its definitive feature is a factory-molded main insulation body that is pre-formed and pre-tested before shipment.
- Product Introduction
The 66kV–110kV Fully Prefabricated Straight-Through Cable Joint is designed to seamlessly splice two high-voltage cables of the same voltage rating. Its definitive feature is a factory-molded main insulation body that is pre-formed and pre-tested before shipment. By reducing on-site installation to a straightforward assembly process, 66kV–110kV Fully Prefabricated Straight-Through Cable Joint minimizes human error and guarantees exceptional operational reliability, dielectric strength, and performance consistency across high-voltage transmission lines.
Model Illustration
Structure and Working Principle
Structure
- Pre-molded Insulation Body: Factory pre-formed using high-performance liquid silicone rubber (LSR). It features integrated semi-conductive shielding and geometric stress control layers to effectively harmonize and equalize electric field distribution.
- Conductor Connector: A high-conductivity metallic connector (crimped or shear-bolt type) designed to splice the cable conductors, ensuring optimal mechanical tensile strength and ultra-low electrical contact resistance.
- Outer Enclosure & Sealing System: Comprises a rugged metallic or high-strength fiber-reinforced composite protective outer shell for superior mechanical impact defense. Integrated with robust multi-layer waterproof seals, it forms an absolute barrier against moisture and water ingress.
Installation Methodology
Installation Methodology: Pre-fabricated joints utilize either a "cold-shrink/expansion" or "slip-on/sliding insertion" methodology. Upon elastic retraction, the insulation body exerts a continuous, uniform interfacial pressure across the cable insulation surface,
Technical parameter
| Item | Technical Parameters |
|---|---|
| Rated voltage & frequency | 64/110 kV, 50 Hz |
| Max. operating voltage | 126 kV |
| Ambient temperature | -40 °C ~ +40 °C |
| Max. conductor operating temp. | 90 °C |
| Max. conductor short-circuit temp. | 250 °C |
| Applicable cross-section | 240 ~ 1600 mm² |
| Partial discharge test (96 kV, ambient) | No detectable discharge (≤5 pC) |
| Thermal cycle test (128 kV, 20 cycles) | Completed |
| High temp. partial discharge test (96 kV) | No detectable discharge (≤5 pC) |
| Impulse + power frequency withstand test | No breakdown/flashover |
| Outer sheath DC withstand test (25 kV, 1 min) | No breakdown |
| Outer sheath impulse withstand test | No breakdown |
Main Features and Advantages
Strengths
Maximum Reliability: The core insulation body is manufactured in a state-of-the-art, factory-controlled dust-free environment. This completely eliminates the risk of impurities, air gaps, and craftsmanship discrepancies common with traditional field-applied taping, guaranteeing highly consistent and stable dielectric performance.
Streamlined & Efficient Installation: The pre-molded architecture dramatically slashes installation time-often by more than 50% compared to conventional methods. By simplifying the deployment process, it drastically reduces dependency on specialized installer skillsets and minimizes the risk of human error.
Uncompromising Operational Performance:
- Electrical Excellence: Delivers superior dielectric strength and exceptional resistance to Partial Discharge (PD).
- Mechanical Resilience: Engineered with outstanding elastic memory and high tear resistance, allowing the joint to easily accommodate slight cable thermal expansion, bending, and ambient vibration.
- All-Weather Durability: Premium silicone rubber material provides excellent resistance to UV radiation, ozone exposure, and extreme temperature fluctuations (tested from-50°C to +90°C).
Space-Saving, Compact Profile: The ultra-compact, streamlined structure significantly reduces the physical footprint, making it ideal for tight spaces such as cable tunnels, vaults, and narrow trenches.
Application Scenarios
- Urban Power Transmission: Engineered for straight-through splicing across long-distance, high-voltage underground cable networks.
- Power Generation & Substations: Ideal for critical connections linking substation terminal bays, transformer outlets, and incoming/outgoing cable sections.
- Heavy Industry & Mining Complexes: Designed to ensure high-capacity, failsafe connections for main power trunk lines and heavy industrial distribution networks.
- Tunnels, Bridges & Specialized Corridors: Purpose-built for long-distance transmission lines traversing complex terrains, utility tunnels, and bridge crossings.
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