October 12, 2022 New energy cable How to identify the advantages and disadvantages?
With the rapid development of new energy technology, more and more cable enterprises have joined in the flood of developing new energy cables. Different from conventional cables, new energy cables have high technical content and are also very strict with the production and application environment.
First, look. Check whether there is quality system certification; Check whether the certificate is standard; Check whether there is a factory name, address, inspection seal and production date; Check whether there is trademark, specification, voltage, etc. printed on the wire. It also depends on the cross section of the wire copper core. The superior copper is bright and soft in color, otherwise it will be inferior.
Second, try. You can take a wire end and bend it repeatedly by hand. Those with soft hand feel, good fatigue resistance, plastic or rubber elasticity and no crack on the wire insulator are superior products.
The first kind of fault - the whole cable is burnt out or a phase is burnt out. This kind of fault causes the current relay on the distribution cabinet to act, and the cable is seriously damaged at the fault.
The second kind of fault - short circuit of all phases of the cable. Similarly, this kind of fault causes the current relay and voltage relay on the distribution cabinet to act, and the cable is also seriously damaged at the fault point (possibly caused by external forces)· The third kind of fault - only one phase of the cable is open circuit, the current relay acts, and the fault point is slightly damaged but obviously exposed. It may be that the current of this phase is too large or it is caused by the cable quality· The fourth kind of fault is short circuit inside the cable, and no trace can be seen on the surface. This kind of fault is generally caused by the quality of the cable, which is relatively rare. Combined with the ranging function and positioning function in the low-voltage cable fault location system, the test can be easily completed. At the same time, the test can be completed independently for different fault characteristics and cable lengths.
The third kind of fault - because the cable is slightly damaged at the fault point, and the signal sent by the transmitter leaks less here, the indication range is narrow when using the positioning equipment for fault location. At this time, the approximate distance of the fault point can be measured with the distance measuring equipment first, and then it is convenient to use the positioning equipment for positioning.
The fourth kind of fault - this kind of fault is difficult to measure among all cable faults at present. At this time, the cable can be tested at both ends of the cable with distance measuring equipment, and then the test results can be compared with the actual length to determine the fault point in a small range (1-3m). At this time, the cable can be excavated to find the suspicious point, Or simply saw off this section of cable (because the low-voltage cable is cheap, the insulation requirements are low, and the connector is easy to make), or use the equipment with positioning function, and use audio positioning in this section to determine the fault point.
