8.7/15kV Fully Cold-Shrink Three-Core Outdoor Terminal

I. Product Overview

The 8.7/15kV fully cold-shrink three-core outdoor terminal is a cold-shrink accessory specifically designed for outdoor terminals of 8.7/15kV three-core power cables. Made of high-performance silicone rubber, it relies on its own elastic shrinkage to achieve insulation, electric field control, sealing and protection of the cable terminal. No heating tools are required, and installation is convenient. It is widely used in outdoor terminal scenarios for 10kV power cables to ensure the safe and stable operation of the cable terminal.

II. Product Characteristics

1. Insulation and electrical properties

• Made of high-quality silicone rubber, it has excellent insulation properties and can effectively withstand the working voltage of 8.7/15kV system. Its power frequency withstand voltage and impulse withstand voltage performance meet industry standards, ensuring the insulation safety of cable terminals.
• With its own stress control structure, it can effectively and uniformly distribute the electric field at the cable terminal, avoid partial discharge caused by electric field concentration, and improve the long-term operational reliability of the terminal.
• After cold shrinkage, it can fit tightly with the cable body to form a continuous and reliable sealed structure, preventing moisture, dust, rainwater, and oil from entering the cable terminal. It has excellent moisture-proof, waterproof, anti-fouling, and anti-salt spray performance, and IP68 protection.

2. Installation and Construction Characteristics

• With its fully shrinkable design, it requires no open flame or heating tools. Installation is achieved through the elastic retraction of the pre-expanded diameter, making the installation process safe and convenient, with no fire hazards, and suitable for special construction scenarios such as outdoor and explosion-proof applications.
• The complete set includes all the accessories needed for terminal fabrication (insulating tubes, stress tubes, sealant, installation tools, etc.), eliminating the need for additional parts during construction, significantly shortening terminal fabrication time and reducing construction costs.
• After installation, the terminal has a neat and aesthetically pleasing appearance, without the uneven shrinkage, bubbling, or deformation issues common with heat shrink products. It exhibits good consistency and facilitates subsequent maintenance and inspection.

3. Environmental and Weather Resistance

• With excellent weather resistance, it can adapt to a wide temperature range of -40℃ to +90℃. The elasticity and insulation properties of silicone rubber do not decrease under high and low temperatures, and there is no risk of cracking, embrittlement or deformation. It is suitable for various scenarios such as outdoor, underground and cable trench.
• It is anti-aging, anti-ultraviolet, and resistant to ozone corrosion. It can be exposed to the outdoor environment for a long time and has a service life of more than 20 years. It is maintenance-free and reduces the cost of operation and maintenance.
• It is resistant to chemical corrosion and can adapt to harsh environments such as humidity, dust, salt spray, and mild acid and alkali. It has no risk of corrosion or degradation and is suitable for industrial and mining enterprises, coastal areas and other scenarios.

4. Mechanical and Adaptation Characteristics

• Silicone rubber materials have high mechanical strength, are tear-resistant and tensile-resistant, and can withstand mechanical stress during construction and operation without the risk of breakage or cracking.
• It is compatible with 8.7/15kV three-core power cables, covering common cross-sectional specifications, and has strong versatility, making it suitable for installation scenarios such as outdoor pole mounting, box-type substations, and cable wells.
• The terminal has a compact structure and small size, making it suitable for installation in narrow outdoor spaces without any space limitations.

III. Technical Parameters

Parameter categories	project	Technical indicators
Electrical parameters	Applicable system voltage	8.7/15kV AC
	Rated voltage	15kV
	Power frequency withstand voltage (5min)	42kV, non-breakdown
	Impact resistance (peak)	95kV, non-breakdown
	Insulation resistance	≥1000MΩ
	Partial discharge quantity	≤5pC (at 1.5 times rated voltage)
Structural and material parameters	Main material	silicone rubber
	Applicable cable core count	Three-core
	Applicable cable cross-section	25mm²~400mm² (select according to specifications)
	Protection level	IP68
	Structural form	Fully shrinkable outdoor terminal (complete set)
Environmental parameters	Applicable altitude	≤2000m (Customization available for high altitudes)
	Ambient temperature	-40℃/ +90℃ (operating temperature), -40℃/ +70℃ (storage temperature)
	relative humidity	≤100% (no condensation)
	Seismic resistance level	Level 8
Implementation Standards		GB/T 12706 “Extruded insulated power cables and accessories with rated voltage of 1kV (Um=1.2kV) to 35kV (Um=40.5kV)” and IEC 60840 “Test methods and requirements for extruded insulated power cables and accessories with rated voltage of 30kV (Um=36kV) and above to 150kV (Um=170kV)”.

IV. Product Composition List

Serial Number	name	use
01	Cold shrink terminal insulation body	Provide main insulation and outdoor protection for cable terminations
02	Cold shrink insulation tubing	Cable phase insulation layer protection and insulation
03	Cold shrink sealing tubing	Cable termination moisture-proof, waterproof, and dirt-proof sealing
04	Three-core branch gloves	Insulation and sealing at the three-core branch of the cable
05/06	Installation accessory box (sealing glue/cleaning agent)	Clean cable surface and seal terminal interface
07	Metal pressure ring	Fixed terminal and cable body
08	Woven copper strip	Cable terminal grounding connection
09	Rain skirt/umbrella skirt (outdoor use only)	Enhanced terminal creepage distance and improved outdoor anti-pollution flashover performance
10	Installation instructions/process card	Terminal manufacturing and construction guidance
11	Sandpaper/Cleaning cloth	Cable surface grinding and cleaning
12	Insulating tape / Semi-conductive tape	Terminal interface insulation and electric field control
13	Protective gloves/goggles	Construction safety protection
14	Installation tools (measuring tape, utility knife, wire strippers, etc.)	Cable stripping and terminal installation
15	Quality Certificate/Inspection Report	Product quality certification documents

V. Scope of Application

1. Applicable voltage level : 8.7/15kV AC power cable system.
2. Applicable scenarios :
3. Fabrication of outdoor terminals for 10kV three-core power cables;
4. Cable terminals for outdoor applications such as outdoor poles, prefabricated substations, cable wells, and power distribution rooms;
5. Cable terminals for special construction scenarios such as explosion-proof and fire-prohibited environments;
6. Outdoor cable terminals in harsh environments such as dampness, dust, and salt spray.
7. Function and application : Provides insulation, electric field control, sealing and protection for outdoor terminals of 8.7/15kV three-core power cables, prevents moisture, rain and dust from entering the cable terminal, uniformly distributes the electric field at the terminal, improves the anti-flashover performance of the terminal, ensures the safe and stable operation of the cable terminal, and avoids leakage, short circuit and fault tripping accidents caused by terminal insulation failure, electric field concentration, poor sealing and flashover.

VI. Usage Conditions

1. Normal operating conditions

• Altitude: ≤2000m;
• Ambient temperature: -40℃ to +90℃; cable operating temperature shall not exceed the conductor’s long-term allowable operating temperature.
• Relative humidity: ≤100% (no condensation);
• Environmental conditions: No corrosive gases, no flammable or explosive media, no severe vibration or impact;
• Installation method: cold shrink installation. Simply pull out the support core wire to complete the shrinkage. The installation space must meet the bending radius requirements of the cable terminal.

2. Special usage conditions (customization required)

• The altitude exceeds 2000m;
• The ambient temperature exceeds the range of -40℃ to +90℃;
• Severely polluted, salt spray, and chemically corrosive environments;
• High vibration and high impact conditions;
• Scenarios requiring non-standard cable cross-sections, special creepage distances, and protection levels.

VII. Installation and Maintenance

1. Installation Requirements

• Before installation, check the product appearance. The silicone rubber terminals should be free of cracks, damage, and bubbles. The support core wires should be intact and free of deformation. All accessories should be complete and undamaged.
• Cut the cable according to the cable terminal manufacturing process. The cutting length must meet the terminal specifications. Avoid damaging the cable insulation layer during the cutting process. After cutting, use a cleaning agent to clean the cable surface to remove oil, dust, and semi-conductive layer residue, and ensure that the surface is dry and clean.
• Install the cold shrink branch glove, insulating tube, stress tube, terminal body and outdoor rain skirt in sequence. After adjusting the position, slowly pull out the support core wire to make the terminal shrink evenly and ensure that each component fits tightly with the cable body without deviation, air bubbles and wrinkles.
• After installation, connect the grounding copper strip according to the process requirements, check that the terminal grounding connection is reliable, and confirm that the terminal shrinks evenly, without damage or gaps, and the installation is complete.

2. Maintenance Requirements

• Regularly inspect the appearance of the terminal. The silicone rubber terminal should be free of cracks, damage, discharge marks, and dirt accumulation. The rain skirt should be intact and undamaged. The terminal should be tightly attached to the cable without looseness or gaps.
• Regularly test the terminal insulation resistance and partial discharge to ensure that the performance meets the requirements and to promptly identify potential insulation hazards.
• Clean the terminal surface to remove accumulated dust and dirt, keep the terminal surface dry and clean, avoid oil and chemical corrosion, and regularly check the rain skirt for integrity to prevent flashover.
• If the terminal shows abnormalities such as cracks, damage, discharge, excessive insulation resistance, or damaged rain skirt, the terminal must be replaced in time. It is strictly forbidden to operate the terminal with defects.

VIII. Precautions

1. The product must be installed, debugged, and maintained by professional electrical personnel with high-voltage cable terminal manufacturing qualifications. Operation by non-professional personnel is strictly prohibited.
2. The product must be used with 8.7/15kV power cables of the corresponding cross-section and number of cores. It is strictly forbidden to use cables of different specifications, otherwise it will lead to insulation and sealing failure and cause safety accidents.
3. The product must not be disassembled or modified without authorization, otherwise the warranty and safety guarantee will be lost. It is strictly forbidden to forcibly stretch or cut the terminal and rain skirt to avoid damaging the silicone rubber material.
4. During installation, cables must be stripped and components installed according to process requirements to avoid damaging the cable insulation layer. Support core wires must be pulled out slowly to avoid uneven contraction or misalignment at the terminals. The installation position of the rain skirt must meet process requirements to ensure that the creepage distance meets the standards.
5. When storing, it should be placed in a dry, ventilated, and cool environment, avoiding direct sunlight, high temperature, humidity, and compression. It is strictly forbidden to contact with sharp objects that may damage the terminal and rain skirt. The support core wire must be kept intact to avoid deformation.
6. During operation, the terminal status needs to be checked regularly to prevent the terminal from being squeezed or bumped by external forces, thus preventing damage to the terminal, failure of the seal, and damage to the rain skirt.

IX. Model Description

Model Identification	meaning
8.7/15kV	Applicable system voltage level: 8.7/15kV power cable
Total cold shrink	Installation method markings, fully shrinkable design.
Three-core	Compatible with cable core count markings, three-core cable
outdoor	Installation scene markers, outdoor terminals
XXmm²	Compatible with cable cross-section markings, such as 70mm², 120mm², 240mm², 400mm², etc.

X. Implementation Standards and Certification

• International Standard: IEC 60840 “Test methods and requirements for extruded insulated power cables and their accessories with rated voltages of 30kV (Um=36kV) and above up to 150kV (Um=170kV)”;
• National Standard: GB/T 12706 “Extruded Insulated Power Cables and Accessories with Rated Voltages from 1kV (Um=1.2kV) to 35kV (Um=40.5kV)”;
• The product has passed the type test of the National Wire and Cable Quality Supervision and Inspection Center and meets the national power industry standards.

XI. After-sales service

• Product warranty period: 18 months from the date of manufacture, or 12 months from the date of commissioning (whichever comes first).
• During the warranty period, products will be repaired or replaced free of charge if quality issues arise.
• We provide technical support, installation guidance, and customized services (adaptation to special specifications and working conditions).

Document Description

The technical parameters in this manual are based on standard operating conditions. Special operating conditions need to be customized according to actual needs. The final specifications shall be subject to the product technical agreement and type test report.

Appendix: Product outline diagram