220kV Porcelain-Insulated Outdoor Cable Termination Kit
The 220kV Porcelain-Insulated Outdoor Cable Termination Kit is a critical asset for extra-high-voltage (EHV) power transmission systems.Its high-strength porcelain bushing provides exceptional electrical insulation and robust mechanical protection, easily withstanding harsh outdoor conditions through its superior waterproof, dustproof, and weather-resistant properties.
- Product Introduction
The 220kV Porcelain-Insulated Outdoor Cable Termination Kit is a critical asset for extra-high-voltage (EHV) power transmission systems.
Its high-strength porcelain bushing provides exceptional electrical insulation and robust mechanical protection, easily withstanding harsh outdoor conditions through its superior waterproof, dustproof, and weather-resistant properties. Inside the assembly, the internal conductor ensures a high-precision, low-resistance connection to the cable, maintaining highly stable power transmission at 220kV. Despite its heavy-duty rating, the termination features a highly engineered, streamlined design that simplifies on-site installation, effectively reducing construction complexity and field duration.
Renowned for its long-term operational reliability, 220kV Porcelain-Insulated Outdoor Cable Termination Kit is widely deployed in demanding outdoor applications-such as substation feeder bays and overhead-to-underground transmission line transitions-to guarantee the safety, efficiency, and continuity of the grid.
Model Meaning
Technical Parameters
| 220kV Porcelain-Insulated Outdoor Cable Termination Kit Technical Parameters | |
| Parameter | Value |
| Rated Voltage and Frequency | 120/220 kV AC, 50 Hz |
| Maximum Operating Voltage | 252 kV |
| Ambient Temperature Range | -40 °C to +40 °C |
| Maximum Conductor Temperature (Normal Operation) | 90 °C |
| Maximum Conductor Temperature (Short Circuit) | 250 °C |
| Applicable Cable Cross-Section | 240~2500 mm² |
| Maximum Altitude | ≤1000 m (Custom designs available for > 1000 m) |
| Pollution Level | Suitable for heavily polluted areas (Class IV per IEC 60815) and coastal high salt-fog regions |
| Partial Discharge Test (Ambient, 190 kV) | No detectable partial discharge with a detection sensitivity of ≤5 pC |
| Thermal Cycling Test (254 kV, 95-100 °C, 8h heating/16h cooling) | Completed 20 cycles |
| Partial Discharge Test (High Temp, 190 kV) | No detectable partial discharge with a detection sensitivity of ≤5 pC |
| Impulse Voltage Test (±1050 kV, 95-100 °C, 10 times for each polarity) | No breakdown or flashover |
| Power Frequency Voltage Test (160 kV, 15 min) | No breakdown or flashover |
| Sealing Test for Assembled Terminations | |
| a. Pressure Leakage Test (250±10 kPa, 1 h) | No gas leakage |
| b. Vacuum Leakage Increase Test (1 h) | |
| b.1 Pressure Increment (B-A) | 60 Pa |
Performance Features
High-Performance Housing: The outer housing is integrally formed using advanced isostatic pressing technology, delivering exceptional mechanical strength, superior dielectric insulation, and outstanding anti-aging performance. It features excellent tracking and erosion resistance, alongside natural self-cleaning properties. Engineered with high seismic resistance, it is uniquely suited for deployment in coastal zones and severe environmental conditions.
Optimized Shed Profile: The alternating large and small shed configuration is computationally and field-proven to provide superior pollution flashover resistance, preventing leakage currents in high-moisture or saline environments.
Advanced Stress Control: The internal stress cone is molded from imported, high-elasticity liquid silicone rubber (LSR). Its geometry is optimized via Finite Element Analysis (FEA) to precisely manage and redistribute electric field stress concentration points, preventing insulation breakdown.
Robust Multi-Layer Sealing: A heavy-duty, multi-layer sealing system guarantees flawless hermetic protection. This completely prevents moisture ingress and internal oil or compound leakage, safeguarding the housing and significantly extending the termination's operational lifespan.
Rigorous Quality Assurance: To guarantee field reliability, all primary insulation components undergo strict factory routine and type testing in absolute compliance with standard international specifications before shipment.
Components & Dimension:
A standard 220kV Porcelain-Insulated Outdoor Cable Termination Kit includes the following primary components:
Conductor Terminal (Wire Clamp): A high-conductivity top connector that securely fastens the internal cable core to the outdoor overhead line or busbar.
Grading Shield / Corona Ring (Uniform Cover): A specialized metallic shield installed at the top of the terminal to ensure a uniform electric field and eliminate localized corona discharges.
Porcelain Bushing Insulator: The main outer housing made of high-strength porcelain sheds, providing primary structural support and outdoor surface insulation.
Insulating Oil / Polyurethane Compound: A high-dielectric liquid or compound filling injected into the housing to eliminate air gaps and provide internal electrical insulation.
Pre-Molded Stress Cone: A high-elasticity silicone rubber component positioned at the cable screen cutback to manage and redistribute critical electrical stress concentration points.
Base Support Pedestal: A robust structural mounting bracket used to anchor the entire termination assembly securely to the substation steel gantry or platform.
Support Insulators: Stand-off insulation blocks located at the base to electrically isolate the termination housing from the grounded support structure, allowing proper sheath grounding.
Cable Wiping Sleeve / Entrance Tail Tube: The bottom sealing assembly that secures the incoming underground cable, providing strain relief and a water-tight hermetic seal at the cable entry point.
Pre-sale & After-sale Service
Service
Inquiry Response
We provide prompt, thorough, and highly professional responses to all technical and commercial inquiries, offering optimized product recommendations tailored to your project requirements.
Order Follow-Up
- From production through to dispatch, we actively monitor every stage of the manufacturing process and provide regular, transparent progress updates.
Agent & Partner Support
- We treat our distributors and agents as strategic partners, collaborating closely to resolve end-user technical, logistical, or field issues without delay.
Problem Solving
We actively listen to your operational concerns, perform root-cause technical analyses, and deliver proactive, optimized solutions to guarantee absolute customer satisfaction..
Installation Guidance:
| Installation Guidance | Description |
|---|---|
| Vulnerability of Cable Accessories | Cable accessories are the weakest part of the cable line; installation quality is crucial for safety. |
| Qualified Personnel | The cable accessories must be installed by specially trained cable accessory construction personnel. |
| Instruction Manual | Read the product installation manual carefully and strictly follow the specified installation steps. |
| Power Off Devices | Ensure that all devices and cables connected to the cable accessories are completely powered off before starting the installation. |
| Cable Condition | Check that the cable structure is intact and free from moisture ingress; do not install cables that are damp or have moisture damage. |
| Specification Check | Check whether the specifications of the cable accessories match those of the supporting cables; inspect the packaging and structural integrity of all accessory parts. |
| Weather Conditions | Avoid installation in rainy, foggy, or windy weather; heating measures should be taken if the ambient temperature is ≤ 5°C. |
| Cleanliness During Installation | Keep your hands, installation tools, and materials clean at all times; avoid unrelated activities (e.g., smoking) during the installation operation. |
| Normal Phenomenon | After heating, red glue may flow out from the bottom of the cold shrink sleeve; this is a normal phenomenon. |
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