Wire line aging refers to the aging of the wire insulation layer, loss of insulation function, aging of the insulation layer will cause leakage, and the aging of the skin will be related to the degree of heating of the wire, the use environment, and the electrical load. We can easily judge the problem of aging of insulation lines through the mouth.
Judging
Look at the appearance of the wire and see the dark cracks.
The hands are bent and insulated, and the stiff cracked outer skin is scattered.
The exact method is to measure the insulation, and the megohm is not low.
The wetness value in rainy days can be small, and the value can be half smaller.
Life can be estimated based on load and age.
The environment and current conditions are generally used for twenty years.
The wire is used for a long period of time, and the joints and wires are always dangerous.
Check the inspection once a year and find that the aging is changed in time.
Mouth interpretation
1. "Follow the wire to check the appearance, see the dark cracks and hard cracks. The hands are bent and insulated, and the stiff cracked outer skin is scattered." The mouth is the insulation layer observed along the wire. If the insulation layer is found to be tarnished and darkened, Hardened, cracked, partially peeled off. When the insulated wire is bent with both hands, the wire is stiff, even the insulation layer is cracked, the insulation layer is peeled off, etc., which indicates that the wire has experienced various degrees of aging and severe aging.
2. "Accurate method to measure insulation, not less than two points in mega-ohms. The wet value in rainy days can be small, and the value can be less than half." The mouth is a relatively accurate judgment of the insulation of the line. The insulation resistance meter can be used to measure the insulation of the electrical circuit. . The insulation of different lines has different minimum allowable values. For example, in the family 220 volt line in use, the insulation resistance is at least 0.22 megohms; the wetness value in rainy days should not be less than 0.1 megohms. If the measured insulation resistance value is less than the above value, there is a problem with the electrical line insulation.
3. “According to the load and age, the life can be estimated. The environment and current conditions are generally used for twenty years.†The mouth is the length of the wire, depending on the quality of the wire and the environment in which the wire is installed. The wire is mainly insulated by a layer of outer sheath. After a long period of time, it is corroded by corrosive gas, and the insulation performance is gradually reduced. It gradually ages and hardens, becomes brittle or falls off, and then does not have insulation effect.
The insulation layer of the household wire is mostly made of plastic and rubber. When it is used for a long time, it will age and lose its insulation. Generally, household wires can be used for about 20 years under normal conditions.
4. “The use of electric wires is over the years, and the joints and wires are always dangerous. Check the inspection once a year and find that the aging is changed in time.†The mouth is the current power line used by many households when building a house twenty years ago or earlier. Laying, the wire insulation layer gradually loosens and aging after a long period of use, causing slight leakage, which may cause a short-circuit fire. In addition, the old house design uses a small load carrying capacity, which is incompatible with the requirements of modern home electrification. Under overload conditions, the aging speed of the wire insulation layer is accelerated. If the heat released by the wire core causes the temperature of the insulation layer to exceed 250 degrees Celsius. The wires will catch fire, so the wires must be replaced early.
Line safety checks are regularly carried out on a regular basis. At least every year, the electric wire, electrical equipment, etc. should be thoroughly inspected by professionals. In particular, the line with a long service life of the joint parts is found to be unsafe for aging, damage, poor insulation, etc., and should be repaired and replaced in time. In order to ensure the safety of electricity.