Power cable faults are caused by insulation failure at the fault point. Generally, the types of faults can be broadly classified into low resistance fault (short circuit) and high resistance fault (open circuit, high resistance leakage, and high resistance flashover).
Causes of Cable Faults There are many reasons for cable faults. Knowledge of this aspect will facilitate troubleshooting. Several common reasons are summarized below.
(1) Mechanical damage: Many failures are directly caused by damage caused by careless laying of cables or mechanical damage caused by operations near the cable path after laying. Sometimes, if the damage is slight, the destruction of the damaged part will only develop to the perforation of the lead in the armored lead after a few months or even several years. The intrusion of moisture will lead to the breakdown of the damaged part and cause failure.
(2) Electrocorrosion of the cable sheath; if the power cable is buried under the ground near a strong underground electric field (such as near the rails of large-scale traffic and electric locomotives), lead sheath corrosion of the cable sheath often occurs, causing moisture intrusion and insulation damage.
(3) Chemical corrosion: The benzene vapor passing through the gas path or the gas station in the acid-alkaline work area often leads to corrosion of cable sheathing and lead packages over long distances.
(4) Ground subsidence: This phenomenon often occurs when the cable crosses roads, railways, and tall buildings. Due to the sinking of the ground, the cable is vertically deformed and deformed, resulting in the collapse of the cable and the lead-bundle cracking and even failure of various types. .
(5) Loss of cable insulation: When the cables are laid, the grooves are uneven, or the accounts on the poles, due to the cable undulations, high and low gaps, the high-level insulating oil flows to a low point and the cable insulation at a high point drops, resulting in failure. occur. This type of failure is more common in early oil-paper insulated cables.
(6) Long-term overload operation: Due to overload operation, the temperature of the cable will increase. Especially in the hot summer, the temperature rise of the cable often leads to weaker cables and the first breakdown of the joint. In summer, the cause of high cable faults is just this.
(7) Vibration damage: The cable running under the railway track breaks down due to the violent vibration that causes the cable skin to elastically fatigue and break down.
(8) Poor construction, poor joints, and failure to lay cables in accordance with technical safety requirements are all important reasons for cable faults.
(9) Wet joints are used in wet weather conditions to make the joint package contain steam and cannot withstand the test voltage, which often results in flashover failure.
When you want to quickly find the fault point, look for some of the cable's original data, observe the road surface of the cable laying, and then combine with the cause of the fault, which will be of great benefit to quickly find the fault point.
Causes of Cable Faults There are many reasons for cable faults. Knowledge of this aspect will facilitate troubleshooting. Several common reasons are summarized below.
(1) Mechanical damage: Many failures are directly caused by damage caused by careless laying of cables or mechanical damage caused by operations near the cable path after laying. Sometimes, if the damage is slight, the destruction of the damaged part will only develop to the perforation of the lead in the armored lead after a few months or even several years. The intrusion of moisture will lead to the breakdown of the damaged part and cause failure.
(2) Electrocorrosion of the cable sheath; if the power cable is buried under the ground near a strong underground electric field (such as near the rails of large-scale traffic and electric locomotives), lead sheath corrosion of the cable sheath often occurs, causing moisture intrusion and insulation damage.
(3) Chemical corrosion: The benzene vapor passing through the gas path or the gas station in the acid-alkaline work area often leads to corrosion of cable sheathing and lead packages over long distances.
(4) Ground subsidence: This phenomenon often occurs when the cable crosses roads, railways, and tall buildings. Due to the sinking of the ground, the cable is vertically deformed and deformed, resulting in the collapse of the cable and the lead-bundle cracking and even failure of various types. .
(5) Loss of cable insulation: When the cables are laid, the grooves are uneven, or the accounts on the poles, due to the cable undulations, high and low gaps, the high-level insulating oil flows to a low point and the cable insulation at a high point drops, resulting in failure. occur. This type of failure is more common in early oil-paper insulated cables.
(6) Long-term overload operation: Due to overload operation, the temperature of the cable will increase. Especially in the hot summer, the temperature rise of the cable often leads to weaker cables and the first breakdown of the joint. In summer, the cause of high cable faults is just this.
(7) Vibration damage: The cable running under the railway track breaks down due to the violent vibration that causes the cable skin to elastically fatigue and break down.
(8) Poor construction, poor joints, and failure to lay cables in accordance with technical safety requirements are all important reasons for cable faults.
(9) Wet joints are used in wet weather conditions to make the joint package contain steam and cannot withstand the test voltage, which often results in flashover failure.
When you want to quickly find the fault point, look for some of the cable's original data, observe the road surface of the cable laying, and then combine with the cause of the fault, which will be of great benefit to quickly find the fault point.
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