Dry transformer Recycling, Nantong Power Transformer Recycling Company provides instructions; Dry type transformer, also known as power transformer and resin transformer, includes recovery of power distribution cabinet, Rudong power cable Consultation of line recycling company: * * * Mr. Wang, welcome to Nantong dry-type transformer recycling, Taizhou Power Cable Line recycling company: the company has long-term acquisition, Nantong used dry transformer recycling, Nantong Hai'an cable recycling, Qidong Power transformer recovery , 50kva-125000kva dry-type transformer, box type transformer, oil immersed S7 S9, S11/SCB/SGB dry-type transformer, Wuxi distribution room, Hangzhou Qianjiang Wire and cable Recycling, Suzhou electric machinery As well as the recovery of high and low voltage distribution cabinets, rectifier transformers and voltage regulating transformers, transformers with good market conditions are generally branded, such as ABB | Anbian Transformer | Daquan | Huapeng | Huayu | Sanleng | Shenyang Transformer | Schneider | Taikai | TBEA | Siemens | Yikai | Zhengtai Transformer Brand Daquan ABB. Contact: * * * Liu Mr. A's on-site inspection/reasonable price recovery/honesty. Various power cable recycling services are provided at high prices for a long time. Power cables are used to transmit and distribute electric energy. Power cables are commonly used in urban underground power grids, outgoing lines of power stations, internal power supply of industrial and mining enterprises, and underwater transmission lines crossing rivers and seas. In power lines, the proportion of cables is gradually increasing. Power cables are cable products used to transmit and distribute high-power electric energy in the trunk lines of the power system, including 1-500KV and above voltage levels, and various insulated power cables.
2、 Nantong Litian Introduction to cable recycling products
The use of power cables has a history of more than 100 years. In 1879, T A. Edison wrapped jute on a copper rod and threaded it into an iron pipe, then filled it with asphalt mixture to make a cable. He laid this cable in New York and created underground power transmission. The next year, the Englishman Karen de invented the asphalt impregnated paper insulated power cable. In 1889, the British S Z. Ferranti laid 10kV oil impregnated paper insulated cable between London and Detford. In 1908, Britain built a 20 kV cable network. Power cables are used more and more widely. In 1911, Germany laid 60kV high-voltage cables, starting the development of high-voltage cables. In 1913, German M. Hochstedt developed the component phase shielded cable, which improved the electric field distribution inside the cable and eliminated the tangent stress on the insulation surface, becoming a milestone in the development of power cables. In 1952, Sweden laid 380 kV very high voltage cables in the northern power plant, realizing the application of very high voltage cables. By the 1980s, 1100kV and 1200kV UHV power cables had been made.
3、 Nantong Lidian Power Transformer Classification of recycled products
By voltage level
According to the voltage level, it can be divided into medium and low voltage power cables (35 kV and below), high voltage cables (110 kV and above), very high voltage cables (275~800 kV) and ultra-high voltage cables (1000 kV and above). In addition, it can also be divided into AC cable and DC cable according to the current system.
By insulation material
1. Oil impregnated paper insulated power cable Oil impregnated paper insulated power cable. Its application history is long. It is safe and reliable, with long service life and low price. The main disadvantage is that the laying is limited by the drop. Since the development of drip free impregnated paper insulation, the problem of drop limitation has been solved, so that oil impregnated paper insulated cables can continue to be widely used.
2. The insulation layer of plastic insulated power cable is extruded plastic power cable. Commonly used plastics are polyvinyl chloride, polyethylene and cross-linked polyethylene. The plastic cable has simple structure, convenient manufacturing and processing, light weight, convenient laying and installation, and is not limited by the laying drop. Therefore, it is widely used as medium and low voltage cables, and has the tendency to replace sticky impregnated oil paper cables. Its disadvantage is the existence of dendritic breakdown, which limits its use at higher voltages.
3. The insulation layer of rubber insulated power cable is made of rubber and various additives, which are fully mixed, extruded and wrapped on the conductive core, and then heated and vulcanized. It is soft and elastic, and suitable for occasions with frequent movement and small laying bending radius.
The rubber materials commonly used for insulation include natural rubber styrene butadiene rubber mixture, ethylene propylene rubber, butyl rubber, etc.
By voltage level
1. Low voltage cable: it is suitable for power transmission and distribution lines with AC 50Hz and rated voltage of 3kv and below.
2. Medium and low voltage cables: (generally 35KV and below): PVC insulated cables, polyethylene insulated cables, cross-linked polyethylene insulated cables, etc.
3. High voltage cable: (generally 110KV and above): polyethylene cable and cross-linked polyethylene insulated cable, etc.
4. Very high voltage cable: (275~800 kV).
5. UHV cable: (1000 kV and above).
4、 Nantong Litian Cable recycling product structure
The basic structure of power cable consists of core (conductor), insulation layer, shielding layer and protective layer.
Wire core
The core is the conductive part of the power cable, which is used to transmit electric energy and is the main part of the power cable.
Insulation layer
The insulation layer is an indispensable part of the power cable structure, which electrically isolates the wire core from the earth and the wire cores of different phases to ensure the power transmission.
Shielding layer
15KV and above power cables generally have conductor shielding layer and insulation shielding layer.
Protective layer
The function of the protective layer is to protect the power cable from the invasion of foreign impurities and moisture, and to prevent the power cable from being directly damaged by external forces.
