WHAT IS THE DIFFERENCE BETWEEN POWER CABLE AND OVERHEAD CABLE?

1. Different cables

1. Power cable

Power cables are cables used to transmit and distribute electrical energy. Power cables are often used in urban underground power grids, power station lead-out lines, internal power supply in industrial and mining enterprises, and underwater transmission lines across rivers and seas.

2. Overhead cable

Aerial cables (full name overhead insulated cables) are overhead conductors equipped with insulating layers and protective sheaths. They are produced by a production process similar to that of cross-linked cables. Way.

Two, different classification

1. Power cable

According to the voltage level, it can be divided into medium and low voltage power cables (35kV and below), high voltage cables (above 110kV), ultra-high voltage cables (275-800kV) and UHV cables (1000kV and above). In addition, it can also be divided into AC cables and DC cables according to the current system.

2. Overhead cable

General overhead cables are single-core, which can be divided into hard aluminum wire structure, hard-drawn copper wire structure, aluminum alloy wire structure, steel core or aluminum alloy core support structure and self-supporting three-core textured structure according to their different structures (The wire core can be hard aluminum or hard copper wire) and so on.

Three, different characteristics

1. Power cable

1) Small footprint. Generally buried in soil or laid indoors, in trenches and tunnels, the insulation distance between lines is small, no poles and towers are required, and it occupies less land and basically does not occupy space on the ground.

2) High reliability. It is less affected by climatic conditions and the surrounding environment, and the transmission performance is stable.

2. Overhead cable

1) High reliability of power supply

The use of overhead cables can greatly reduce all kinds of short-circuit faults (especially the common flashover faults of overhead bare wires), and the failure rate is 4-6 times lower than that of overhead bare wires.

The domestic overhead cable was put into trial operation in Shanghai in 1988. The test overhead cable traveled along the dense boulevard of Huaihai Road. After the test of the typhoon season in Shanghai and the high temperature in summer, it ran well, and its power supply failure rate was greatly reduced compared with the original overhead bare wire. Aerial cables will not produce water trees during use, and the insulation quality of the cables will not decrease significantly after years of operation.

2) Good power supply security

The use of overhead cables greatly reduces personal electric shock casualties.