High-voltage transmission systems rely on safe and reliable cable connections, especially at 230kV levels. Outdoor terminations serve as the interface between a high-voltage cable and external equipment, comme les transformateurs, appareillage de commutation, or overhead lines. Unlike indoor terminations, outdoor kits are exposed to weather, Le rayonnement UV, and pollution, making design, matériaux, and installation quality critical for long-term performance.
UN 230kV Cable Outdoor Termination Kit ensures the smooth transition of the cable’s insulation to air while controlling electrical stress and providing mechanical support. Modern designs integrate features that guarantee both electrical safety and environmental protection.
What Is a 230kV Cable Outdoor Termination Kit?
UN 230kV outdoor termination kit is a complete assembly used to connect high-voltage cables to outdoor electrical apparatus. It ensures proper insulation, reliable conductor connection, and protection against environmental influences.
Key functions include:
- Transitioning from cable insulation to air insulation safely
- Controlling electric stress to prevent partial discharges
- Providing mechanical support and stability
- Offering weatherproofing and UV protection
Comparison with GIS Termination
While outdoor terminations are installed in open-air environments, GIS terminations connect cables to gas-insulated switchgear within sealed enclosures. Both systems share design principles: stress control, intégrité de l'isolation, and conductor connectivity. Cependant, outdoor kits require additional protection against weather, contamination, and mechanical forces.
Main Components of a 230kV Outdoor Termination Kit
Stress Control Device
This component evenly distributes electrical stress at the cable end, preventing insulation failure. Modern kits use silicone-based or epoxy-molded stress cones.
Insulation Body
The insulation body forms the primary dielectric barrier between the energized conductor and the environment. Silicone rubber is widely used due to its flexibility, excellent insulation properties, and weather resistance.
Sheds
Sheds (or skirts) extend along the insulation body, increasing creepage distance and preventing surface tracking in polluted or wet conditions.
Connecteur de conducteur
The connector ensures a secure, low-resistance connection to external equipment while withstanding mechanical loads and thermal expansion.
Sealing System
The sealing assembly prevents moisture and dust ingress, preserving the cable’s dielectric performance over time.
Mounting Bracket
The bracket supports the termination physically, ensuring proper alignment with the connected equipment while resisting wind and mechanical forces.
Types of Outdoor Termination Kits
Pre-Molded Termination
Factory-made silicone or epoxy components ensure consistent quality and faster installation.
Cold Shrink Termination
Elastic materials shrink onto the cable without heating, simplifying field installation and reducing errors.
Heat Shrink Termination
Requires heat to form a tight seal. It is cost-effective but demands careful control during installation.
Conductor Sizes and Technical Parameters (25 mm² à 3000 mm²)
When designing a termination, conductor size affects mechanical strength, stress distribution, and thermal performance. Below is a reference table for 230kV applications.
| Taille du conducteur (mm²) | Environ. AWG/MCM | Diamètre (mm) | Résistance CC (Ω/km @20°C) | Capacité actuelle (UN) | Application |
|---|---|---|---|---|---|
| 25 | 4 AWG | 5.6 | 0.727 | 180–200 | Small feeder |
| 35 | 2 AWG | 6.7 | 0.524 | 220–250 | Light distribution |
| 50 | 1/0 AWG | 8.0 | 0.387 | 260–300 | Medium load |
| 70 | 2/0 AWG | 9.6 | 0.268 | 300–350 | Substation |
| 95 | 3/0 AWG | 11.0 | 0.193 | 350–400 | Feeder line |
| 120 | 4/0 AWG | 12.4 | 0.153 | 400–450 | Standard HV |
| 150 | 300 MCM | 13.9 | 0.124 | 450–500 | Distribution |
| 185 | 350 MCM | 15.5 | 0.099 | 500–550 | Transmission |
| 240 | 500 MCM | 17.5 | 0.075 | 600–650 | 230kV standard |
| 300 | 600 MCM | 19.5 | 0.060 | 700–750 | High capacity |
| 400 | 800 MCM | 22.6 | 0.047 | 800–850 | Bulk power |
| 500 | 1000 MCM | 25.2 | 0.036 | 900–1000 | Main feeder |
| 630 | 1250 MCM | 28.3 | 0.028 | 1050–1150 | Heavy load |
| 800 | 1600 MCM | 31.9 | 0.022 | 1200–1300 | HV transmission |
| 1000 | 2000 MCM | 35.7 | 0.017 | 1350–1450 | Substation connection |
| 1200 | 2500 MCM | 39.1 | 0.015 | 1500–1600 | Grid backbone |
| 1400 | — | 42.2 | 0.013 | 1650–1750 | Extra heavy load |
| 1600 | — | 45.2 | 0.011 | 1800–1900 | Ultra HV |
| 2000 | — | 50.5 | 0.009 | 2000–2100 | High-demand transmission |
| 2500 | — | 56.4 | 0.007 | 2200–2300 | Extra capacity |
| 3000 | — | 61.8 | 0.006 | 2400–2600 | Extreme load |
Processus d'installation
- Préparation des câbles: Remove outer layers carefully and clean the conductor.
- Stress Control Installation: Place stress cones or pre-molded devices to ensure proper field distribution.
- Insulation Assembly: Mount insulation body and sheds along the cable.
- Connexion du conducteur: Connect cable conductor to external equipment.
- Sealing: Apply seals and moisture barriers to protect the termination.
- Mounting: Install bracket and align with external apparatus.
- Essai: Perform electrical tests to verify insulation and continuity.
Proper installation ensures the termination performs reliably for decades under environmental stress.
Advantages of 230kV Outdoor Termination Kits
- Reliable performance in open-air conditions
- Resistance to UV, humidité, and pollution
- Integrated stress control for long-term insulation stability
- Flexible design for various equipment connections
- Compatible with large conductor sizes up to 3000 mm²
Applications
230kV outdoor terminations are widely used for:
- Overhead line connections
- Air-insulated substation interfaces
- Transformer and switchgear connections
- Renewable energy substations
They are especially important where GIS termination is not feasible due to space or cost constraints.
Choosing the Right Termination
Key considerations:
- Cable size and conductor type
- Conditions environnementales (pollution, UV, humidité)
- Equipment compatibility
- Méthode d'installation (pre-molded, heat shrink, or cold shrink)
- Compliance with industry standards
Careful selection ensures reliable long-term operation.
230kV Cable Outdoor Termination Kit
UN 230kV Cable Outdoor Termination Kit is a vital component in high-voltage power transmission. It ensures a safe and reliable connection while providing insulation, mechanical support, et protection de l'environnement. Conductor size selection from 25 mm² à 3000 mm² affects both electrical and mechanical design.
For high-quality manufacturing, Deux câbles is a trusted 230kV cable termination kit manufacturer in China, offering reliable solutions for global transmission networks.