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US power industry continues to slump
US power industry continues to slump
China Energy News - China Energy Network | Recently, the power companies in the US public utilities sector have successively announced the 2018 annual report. Although the industry financial report data has not changed significantly, and the indicators have remained basically stable, but the executives of the US power companies They are not satisfied w...
1 week ago
Ultra high voltage single core cable selection and application
Ultra high voltage single core cable selection and application
The sheath protector is generally installed in the cable line cross-connect box and in the grounding protection box.1, the role of the protective layer protector1) Limit the power frequency induced voltage in the metal sheath of the cable line——When the cable line is in normal working condition, the high voltage cable sheath protector exhibits a high r...
1 week ago
The difference between DC cable and AC cable in power cable
The difference between DC cable and AC cable in power cable
The DC cable has the following characteristics compared with the AC cable.1. The system used is different. The DC cable is used in the rectified DC transmission system, and the AC cable is often used in the power frequency (domestic 50 Hz) power system.2. Compared with the AC cable, the power loss during the transmission of the DC cable is small. The power loss...
1 week ago
Aluminum alloy core aluminum stranded wire overall performance improvement skills
Aluminum alloy core aluminum stranded wire overall performance improvement skills
The rated breaking force of the wire is calculated from the strength of all aluminum single wires and reinforcements. However, the actual breaking force will be deviated from the actual calculated value. The main reason is that the strength of each single wire is not fully utilized. Therefore, when designing the product, not only must meet the minimum stre...
1 week ago
Main factors that heat the wires and cables during operation
Main factors that heat the wires and cables during operation
With the development of electricity, there are more and more aspects of relying on electricity in life, and the importance of wire and cable is also highlighted. We know that wire and cable are used for power transmission. If the wire and cable continue to heat up during operation, the temperature of the wire and cable will be too high. If it is short, it will cau...
1 week ago
How to lay power cable lines
How to lay power cable lines
(1) Directly buried in the ground, this is the most common and economical method of laying.(2) Laying in the cable trench for laying multiple cables.Although the cable ditch was larger than the direct burial at the time, it was convenient for temperature monitoring and ventilation and cooling measures to improve its heat dissipation conditions. In addit...
1 week ago
Main performance analysis of control cables
Main performance analysis of control cables
The control cable is a PVC insulated and PVC sheathed control cable suitable for industrial and mining enterprises, energy and transportation departments, control and protection lines for AC rated voltages up to 450/750 volts.Performance characteristics:1.DC resistance: 20 ° C, 0.4 mm copper wire, less than or equal to 148 Ω / km, 0.5 mm copper wire,...
1 week ago
How to distinguish inferior wire and cable
How to distinguish inferior wire and cable
Characteristics of shoddy wires1, the cable length is not enoughThe main means used by unscrupulous manufacturers is to make an article on the length of the wire and cable. The actual length of the wire and cable is less than the nominal length, and the pricing is performed according to the nominal length. The most typical one is the cloth wire wrapped in a roll...
1 week ago
Whether the wire is good for a single share or a good for multiple shares
Whether the wire is good for a single share or a good for multiple shares
First, the difference between single and multiple shares of wireIn fact, it is easy to understand literally that each wire of a single strand of wire is composed of a single thick wire, also called a hard wire; and each wire of a multi-strand wire is composed of a plurality of thin copper wires. A wire composed of silk, also called a cord.Second, is the decoratio...
1 week ago
Control cable installation measures
Control cable installation measures
In order to ensure the control cable in the event of insulation breakdown, mechanical damage or fire, reduce the scope of the spread, the national standard GB50217-91 "Power Engineering Cable Design Specification" specifies: dual protection current, voltage and DC power supply and trip control loop, etc. Two systems that require enhanced reliability...
1 week ago