Product Introduction and Application Scope

The product features a tightly compressed conductor (copper or aluminum) with an extruded inner shield and weather-resistant cross-linked polyethylene. It boasts a simple, safe, and reliable design, while also delivering outstanding mechanical, physical, and electrical properties. Additionally, it exhibits excellent resistance to tracking, surface discharge, and environmental degradation. This makes it ideal for use in high-rise building complexes, tourism development zones, and areas with abundant trees—perfectly suited for 1kV and 10kV overhead transmission lines.

Product Standards and Usage Characteristics

This product is manufactured according to GB/T12527-2008 and GB/T14949-2008.

Cable rated voltages are divided into two types: 1kV and 10kV. The cable's long-term permissible operating temperature is 90°C for cross-linked polyethylene insulation. During short circuits (with a maximum duration of no more than 5 seconds), the highest temperature allowed for cross-linked polyethylene insulation is 250°C. Additionally, the cable must be installed at temperatures not lower than -20°C.

Production Scope

3.1 Rated Voltage: 1kV, 10kV

3.2 Specifications: 10–300 mm²

3.3 Main Models: JKLYJ, JKTRYJ, JKY

Core Structure and Composition

Steel core: Located at the center of the conductor, it typically consists of a single or multiple galvanized steel wires twisted together.

Conductor: Multiple aluminum wires are twisted together and then compacted through a pressing process to achieve a nearly circular cross-section with a smooth, even surface, which facilitates uniform extrusion of the insulation layer.

Conductor shielding layer: Primarily used in overhead insulated conductors rated for medium voltage (such as 10 kV, 20 kV, 35 kV) and higher. It provides a smooth transition interface between the conductor and the insulation layer.

Insulation Layer: The core structure that distinguishes overhead conductors from bare wires—commonly made of cross-linked polyethylene—provides reliable electrical insulation, preventing phase-to-phase and ground faults while enhancing the safety and reliability of power line operation.

Main applications

1. Urban distribution network (primarily at 10kV and below):

• Resolving tree-line conflicts: On streets and in residential areas with dense tree coverage, insulating layers effectively prevent branches from coming into contact and causing short-circuit tripping, thereby enhancing power supply reliability.

• Enhance personal and equipment safety: The insulation layer reduces the risk of accidental contact with live conductors by personnel (especially maintenance staff and residents); minimizes short circuits caused by foreign objects (such as kites, ribbons, or birds and animals) coming into contact with lines; and helps mitigate corrosion of metal components (like steel towers and crossarms).

• Enhancing the urban environment: Compared to the structure of bare conductors paired with insulators, it boasts a cleaner and more streamlined appearance.

2. Rural Power Grid:

• Wind and bird protection: Reduces phase-to-phase short circuits caused by wind-induced conductor galloping; minimizes short-circuit faults triggered by bird activity.

• Anti-electricity theft: Compared to bare conductors, it’s more difficult to illegally tap into electricity directly from insulated wires.

3. Special Environments:

• Coastal and high-salt-mist areas: The insulation layer provides extra protection, reducing corrosion of conductors and metal fittings caused by salt mist.

• Old-line renovation: Commonly used to replace existing bare conductor lines, enhancing safety and reliability.

Main Features

1. Insulating Properties: This is the core characteristic. The insulation layer surrounding the conductor provides electrical isolation between phases and to ground, significantly reducing the likelihood of phase-to-phase and ground faults.

2. Exceptionally High Power Supply Reliability: As described, this system effectively reduces short-circuit faults caused by external factors such as trees, foreign objects, birds, and animals, significantly minimizing both the frequency and duration of outage incidents.

3. Enhance safety: Reduce the risk of personnel accidentally coming into contact with live conductors, minimize damage to the lines themselves, switchgear, transformers, and other equipment caused by short-circuit faults, and lessen the hazards posed by short-circuit arcs to surrounding objects.

4. Reducing Corrosion: The insulation layer protects conductors from direct erosion by atmospheric pollutants, while also minimizing leakage currents that cause electrolytic corrosion of metal towers and hardware.

Inspection Report