NOYAFA Electronic specializing in testing instruments and cable testers for 16 years
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NOYAFA Electronic specializing in testing instruments and cable testers for 16 years
Author: Noyafa–Cable Tester Manufacturer
Shenzhen cable fault detection, skilled and advanced equipment During the operation of wire and cable, due to the existence of resistance, it will heat up. The resistance of the wire is generally very small, and its heating power can be expressed by the formula q=I^2R. q=I^2R shows that: for a section of actual use of Shenzhen cable fault detection, the technology is superb, and the equipment is advanced in the process of wire and cable operation, due to the existence of resistance will heat up.
The resistance of the wire is generally very small, and its heating power can be expressed by the formula q=I^2R. q=I^2R shows that: for a piece of wire in actual use (R is basically constant), the greater the current passing through the wire, the greater the heating power; if the current is constant, the heating power of the wire is also constant. . The heat released during operation will be absorbed by the wire itself, causing the wire temperature to rise.
Although the wire is constantly absorbing the heat released by the current and doing work during the operation, its temperature will not rise unlimitedly. Because the wire is absorbing heat, it is also continuously releasing heat to the outside world. The fact shows that the temperature of the wire gradually rises after the wire is energized, and finally the temperature is constant at a certain point. At this constant point, the heat absorption and heat release power of the wire are the same, and the wire is in a state of thermal equilibrium.
There is a limit to the ability of conductors to withstand higher temperature operation, and operation beyond a certain maximum temperature can be dangerous. This maximum temperature naturally corresponds to a certain maximum current, and the wire running beyond this maximum current is overloaded. Overloading the wire directly increases the temperature of the wire itself and its surrounding items.
The rise in temperature is the most direct cause of such fires. KC-900 host + central control unit Overload will damage the insulation layer between the two-strand wires and cause a short circuit, burn the equipment, and cause a fire. The double-strand wires are separated by the insulating layer between them, and the overload will soften and destroy the insulating layer, which will cause the direct contact of the two-strand wires to cause a short circuit and burn the equipment.
At the same time, the high temperature generated by the high current at the moment of the short circuit causes the line to catch fire and fuse, and the generated molten beads fall to the combustible material and cause a fire. The overload temperature rise can also directly ignite nearby combustibles. The heat transfer of the overloaded wire increases the temperature of the nearby combustibles. For the nearby combustibles with lower ignition points, it is possible to ignite them and cause a fire.
This danger is particularly prominent in warehouses where flammable materials are stored and buildings with easy-to-use and combustible decorations.
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