When the power cable passes through a certain load current, it will be heated. With the increase of load current, the higher the cable surface temperature is. If it is not managed in time, the consequences can be imagined. For example, PVC cable is considered with core temperature of 70 ℃ as the upper limit, and the surface temperature will be 5-10 degrees lower. Therefore, the ACSR Cable surface temperature is basically safe below 60 degrees. Considering the power supply maintenance, the lower the temperature is, the better.
The causes of heating during operation of cables are as follows:
1. The resistance of ABC Cable conductor does not meet the requirements, which causes the cable to generate heat during operation.
2. Improper cable selection causes the conductor cross-section of the cable used is too small, and overload occurs during operation. After a long time of use, the heating and heat dissipation imbalance of the cable cause heating phenomenon.
3. The cable is arranged too densely, the ventilation and heat dissipation effect is not good, or the cable is too close to other heat sources, which affects the normal heat dissipation of the cable, and may also cause the heating phenomenon of the cable in operation.
4. The joint manufacturing technology is not good, and the crimping is not tight, which causes the contact resistance at the joint is too large, and the cable will generate heat.
5. The insulation performance of the cable is not good, which causes the insulation resistance is small, and the heating phenomenon will also occur in the operation.
6. The partial sheath of armored cable is damaged, which causes slow damage to the insulation performance after water inflow, which results in the gradual decrease of insulation resistance and also the heating phenomenon in the operation of the cable.
After the cable has a heating phenomenon, if the cause is not found, the cable will continue to be powered on continuously and will cause insulation thermal breakdown. The short circuit between phases of the cable trip phenomenon, serious fire may be caused.
After the cable has a heating phenomenon, if the cause is not found, the cable will continue to be powered on continuously and will cause insulation thermal breakdown. The short circuit between phases of the cable trip phenomenon, serious fire may be caused.
The reason and solution of plug power cord heating are everywhere in family life. The electric appliances can not be separated from the power cord. This small power cord may despise him.
The heat of the power cord of water heater is usually caused by the poor coordination with the socket. Meanwhile, the normal heating phenomenon should be considered. If the surface temperature of the plug is less than the ambient temperature plus 50 ℃, it is normal. If abnormal heat is abnormal, it is necessary to consider replacing the socket or checking the cooperation between the plug and the socket.
1. the connection between plug and socket is poor, and the load power is high, which causes the plug to heat up. Such as electric kettle, electric iron, etc.
2. the thread head in the new plug is loose, which is caused by rough production process and other reasons.
3. the old plug is used for a long time, and the insulation performance is reduced (or the plug is loose).
How to use plug wire safely
The main reason for the heating of plug wire is that the load of the wire is increased due to the long-term power consumption of electrical equipment. Special multi-function socket, if connected with several high-power electrical equipment at the same time, the power line of the socket must be overloaded, and in that case, it is very easy to cause the wire to burn.
Therefore, we should pay attention to the reasonable distribution of electricity in our life, and regularly check the plug wires and sockets to see if the wires are old and whether the contact between the plug and socket is bad. Sometimes because the production department process is not fine, the plug wire head will not be firm, so the plug in the plug power supply will cause poor contact and lead to plug heating. At the same time, every household should pay attention to that the plug will be old for a long time, and the insulation property will be reduced. It should be replaced in time. For plug wires of high-power appliances, we suggest that the wire core is used to increase the type, and it is better to use the pin with grounding. If it is found that the power socket or wire plug is hot, which causes the electric appliances to burn, do not act recklessly, and take care of the management.
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