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Wire insulation aging judgment method
- Jun 25, 2018 -

The aging of wire lines refers to the aging of the wire insulation layer, loss of insulation function, aging of the insulation layer will cause leakage, aging of the skin will be related to the degree of wire heating, the use of the environment, electrical load.

Wire insulation aging judgment method

The aging of wire lines refers to the aging of the wire insulation layer, loss of insulation function, aging of the insulation layer will cause leakage, aging of the skin will be related to the degree of wire heating, the use of the environment, electrical load. We can easily judge the problem of aging of insulation lines through the use of oral hygiene.


Judgment


Check the appearance along the wires, darken and hard cracks.


Hands bent wire insulation, rigid cracking skin scattered.


Accurate method to measure insulation, Meguro is not low two.


The wetness value in rainy days can be small and the value can be further reduced by half.


According to the load and age, life can be estimated.


Environment and current conditions are generally used for 20 years.


The use of the cable is over the age limit, and connectors and wires are always in danger.


Once a year inspection inspection, found that aging and timely change.


Explained


1. "Look at the appearance of the wires and look for darkened hard cracks. The hands are bent and insulated, and the cracks are cracked." The cheek refers to observing the insulation along the wire, and if it is found that the insulation is dull or dark, Harden, crack, and partially fall off. When the insulated wire is bent with both hands, the wire becomes stiff, and even the insulating layer cracks, the insulating layer falls off, etc., which indicates that the wire has experienced various degrees of aging and severe aging.


2. "Accurate method to measure insulation, megohm is not low two. Rainy days wet value can be small, the value can be less than half." The mouth is refers to the more accurate judgment of the insulation status of the line 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 a home 220 volt line in use, the insulation resistance is at least 0.22 megohms; the rainy day wetness value 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 insulation of the electrical line.


3. "According to the load and age, the life can be estimated. Environment, current conditions, generally used for 20 years." The length of the cable is the length of life of the wire, depending on the quality of the wire and the environment where the wire is installed. Wires are mainly insulated by a layer of external insulation, over time, corrosion by corrosive gases, gradually reducing the insulation properties, slowly aging and hardening, brittle or falling off, this time will not play a role in insulation.


The insulation layer of the external appearance of household wires is made of plastic and rubber, and if used for a long time, it will deteriorate and lose its insulation effect. General household wires can be used for about 20 years under normal conditions.


4. "Using extra years of wire, connectors and wires are always in danger. Checking the inspections once a year will find that aging will change in time." The word means that the power lines currently used by many households are when building houses more than 20 years ago or earlier. Laying, the gradual and loose aging of the wire insulation after a long period of use will cause a slight leakage, and in severe cases it will cause a short circuit and fire. In addition, the wires used in the old houses are designed to carry a small load, which is incompatible with the requirements of modern home electrification. In the event of overload, the aging of the wire insulation layer is accelerated. If the heat released from the core causes the insulation temperature to exceed 250 degrees Celsius. The wires will catch fire, so you must replace the wires as soon as possible.


Regularly conduct line safety inspections. Every year at least professionals are required to thoroughly inspect electrical wires, electrical equipment, etc., especially when the connectors are used for a long period of time, and unsafe conditions such as aging, damage, and poor insulation of the wires are discovered and repaired and replaced in time. To ensure electricity safety.