Jan. 15, 2020
What are the causes of cable aging? Aluminum Alloy Cable
Manufacturer has summarized for you, the insulation is reduced and
breakdown is the cause of aging failure of wire and cable. There are many
elements that cause the insulation to decrease. According to the actual
operation experience, the following reasons are summarized:
1) Cause of cable aging: damage by external force. Judging from the data
analysis in recent years, especially now in the rapid economic development, most
cable failures are now caused by mechanical damage. For example: the cable is
not constructed in accordance with normal specifications during the laying and
installation process, which is likely to cause mechanical damage; the
construction of the buried cable is particularly easy to damage the cable in
operation. Sometimes if the damage is not serious, it will take years to cause
the damaged part to completely break down and form a fault. Sometimes the damage
is relatively serious and a short-circuit fault may occur, which directly
affects the safety of the power unit.
CSA Aluminum Alloy Cable
2) Reason for aging of RWU90 Aluminum Alloy Cable: chemical
corrosion. If the cable is buried in a place with acid or alkali effect, it is
likely to corrode the armor or outer sheath of the cable. The protective layer
will suffer chemical corrosion or electrolytic corrosion for a long time, which
will cause the protective layer to fail and the insulation to be lowered.
3) Cause of cable aging: insulation is damp. This situation is also very easy
to happen, it usually occurs at the cable joint in the buried or drain pipe. For
example: unqualified cable joints and joints are completed under wet conditions,
which will cause water or water vapor to enter the joints. Over time, water
branches will form under the action of the electric field, which will gradually
damage the insulation strength of the cable and cause malfunction.
4) Cause of cable aging: cable connector failure. The most vulnerable part of
the cable line is the cable connector. Cable connector failures often occur due
to personnel's failure to operate according to regulations. In the process of
making cable joints, if the construction crew has any reasons such as
insufficient crimping of the joints, insufficient heating, etc., the insulation
of the cable head will be reduced, which will cause an accident.
5) Cause of cable aging: long-term overload operation. Overload operation,
due to the thermal effect of the current, the load current will inevitably cause
the conductor to heat up when passing through the cable. At the same time, the
skin effect of the charge and the eddy current loss and insulation loss of the
steel armor will also generate additional heat, which will increase the cable
temperature. During long-term overload operation, excessive temperature will
accelerate the aging of the insulation, and even the insulation will be broken
down. Especially in the hot summer, the temperature rise of the cable often
leads to the breakdown of the weak insulation of the cable. Therefore, in the
summer, the cable has a lot of faults.
6) Causes of cable aging: environment and temperature. Environmental factors
and heat sources where the cable is located can also cause the cable to
overheat, break down insulation, and even explode.
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welcome to consult.