The broken core fault point has the following methods to detect: 1.1. Induction method It can be used with induction pen and digital multimeter; suitable for cables without metal armor and steel tape shielding; attention should be paid to prevent electric shock, the test place and the terminal connection when the equipment is rewinded. specific … Read more
In 1988, a transoceanic submarine optical cable (TAT-8) system was installed between the United States, Britain and France, with a total length of 6,700 kilometers.This optical cable contains 3 pairs of optical fibers, each pair has a transmission rate of 280Mb/s, and the relay station distance is 67 kilometers. This is the first communication submarine … Read more
In recent years, silane cross-linked polyethylene cable material (hereinafter referred to as XLPE) has become the leading material for low-voltage cross-linked (xlpe) insulated cable insulation because of its simple manufacturing equipment, mature technology, convenient operation, and low overall cost. At present, the commonly used XLPE is the two-step XLPE. When the cable factory produces the … Read more
Part 1:Relevant standards and specifications for cable selection 1. DL/T5044-2004 People’s Republic of China Electric Power Industry Standard 2. GB50217 Power Engineering Cable Design Code Part 2:Main technical requirements 1. Two-core cables should be used for the DC power supply loop, and single-core cables can be used when needed. 2. Polyvinyl chloride insulated cables are … Read more
The insulation resistance of directly buried power cables is reduced and the phenomenon of cable line failures often occurs, especially when the cable insulation is damp, it is easy to cause the insulation resistance of directly buried power cables to decrease and substandard 1. The cable raw materials are damp The raw materials used for … Read more
The main technical indicators related to fire safety are the flame retardancy of CO2 cables, the density of smoke and the toxicity of the gas. American fire protection standards pay more attention to the first two issues, but Europe and the United States have completely different views on fire safety. The American traditional concept believes … Read more
As fire-resistant cables are now more and more widely used, many manufacturers are producing them, but often the quality cannot be guaranteed. Therefore, under normal circumstances, when companies develop fire-retardant cable products, they first try to manufacture a section of the product, send it to the relevant national inspection agency, and then start mass production … Read more
In urban power grid renovation projects, cables, especially XLPE insulated power cables, have been widely used. However, due to the particularity of the cable, there are special requirements for the installation, operation and maintenance of the cable. Moisture or water ingress of the cable reduces the insulation resistance of the cable, which is an important … Read more
1. Power cable: NH-VV NH-VV copper core PVC insulated PVC sheathed fire-resistant power cable. Suitable for rated voltage 0.6/1KV. Use characteristics: Long-term allowable working temperature is 80℃. Allowable bending radius during laying: single-core cables are not less than 20 times the cable outer diameter, and multi-core cables are not less than 12 times the cable … Read more
Photovoltaic cable: PV1-F1*4mm2 The cable from the string to the combiner box is generally used: photovoltaic cable PV1-F1*4mm2. Features: The photovoltaic cable has a simple structure. The polyolefin insulation material used in it has excellent heat resistance, cold resistance, oil resistance, and ultraviolet resistance. It can be used under harsh environmental conditions and has a … Read more