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Reason for the heating of cable Straight Through Joint

2023-03-20
No matter the cable Straight Through Joint produced by Chinese or international factories helps to protect the operation of the cable. No matter the heat shrinkable Straight Through Joint or cold shrinkable Straight Through Joint, it may encounter the problem of heating when the cable is officially energized.

When the power cable has a certain load current passing through, it is always higher or beyond the maximum allowable continuous working temperature of the cable (generally 90 ℃), the cable will continue to heat. If you do not find the cause and contact the fault in time, the cable will cause insulation thermal breakdown after power operation again, leading to the occurrence of interphase short-circuit trip of the cable. More serious will cause fire accidents.

1. Some electrical installation and construction personnel often do not pay attention to the installation quality when laying wires: do not install the insulation tube where the insulation sleeve should be used; There are no junction boxes where they should be; Even in the wire joint is not the use of hinge method, but the use of illegal curved hook connection method. The contact resistance of this curved hook connection method is very large, and the constant heating when energized will make the nearby wood gradually dry, carbonized, and finally burning, causing a fire.

2. Cable Straight Through Joint heating will not only cause a large amount of power loss, and will seriously affect the normal work of electrical equipment, light line working current increases, electrical equipment life is shortened, heavy will suddenly interrupt the ongoing production, scientific research, medical surgery and other activities, but also lead to fire and electric shock accidents and so on, causing inestimable losses.

3. If the seal is not stable, the moisture will invade the interior of the cable, reducing the insulation performance.

After the cable heats up, if the cause of the fault cannot be found in time, the insulation thermal breakdown will occur after the cable is continuously energized. Lead to cable short circuit trip, serious fire, which requires our technical personnel to pay attention to lay in accordance with the requirements.
heat shrinkable straight through joint

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