電纜被挖斷通常是由于以下幾個原因造成的：

　　Cable breakage is usually caused by the following reasons:

　　機械損傷 ：

　　Mechanical damage:

　　重物砸傷電纜。

　　Heavy objects hit the cable.

　　挖掘機在施工過程中不慎挖到電纜。

　　The excavator accidentally dug into the cable during the construction process.

　　電纜敷設時彎曲過度導致絕緣層受損。

　　Excessive bending during cable laying resulted in damage to the insulation layer.

　　裝運過程中電纜受到擠壓，損壞絕緣和保護層。

　　During the shipping process, the cable was compressed, resulting in damage to the insulation and protective layer.

　　直埋電纜因地層沉陷承受過大的拉力。

　　Directly buried cables bear excessive tension due to ground subsidence.

　　施工不當 ：

　　Improper construction:

　　施工方法不正確，使用的材料質量差。

　　The construction method is incorrect and the quality of the materials used is poor.

　　電纜頭和中間薄弱環節發生故障。

　　The cable head and the weak link in the middle have malfunctioned.

　　電纜頭施工工藝不良，導致水分侵入電纜內部。

　　Poor construction technology of cable heads leads to moisture infiltration into the interior of the cable.

　　敷設電纜時未采取足夠的保護措施。

　　Insufficient protective measures were taken during cable laying.

　　絕緣受潮 ：

　　Insulation moisture:

　　電纜頭施工工藝不良，水分進入電纜內部。

　　Poor construction process of cable head, moisture entering the interior of the cable.

　　電纜內護層破損，導致水分進入。

　　The inner protective layer of the cable is damaged, causing moisture to enter.

　　電纜外皮受化學腐蝕產生空洞。

　　The cable sheath is subjected to chemical corrosion, resulting in voids.

　　鉛包電纜敷設在震源附近，長期震動導致疲勞龜裂。

　　Lead wrapped cables are laid near the earthquake source, and long-term vibration can cause fatigue cracking.

　　過電壓 ：

　　Overvoltage:

　　大氣過電壓或內部過電壓導致絕緣層擊穿。

　　Atmospheric overvoltage or internal overvoltage causes insulation layer breakdown.

　　絕緣老化變質 ：

　　Insulation aging and deterioration:

　　電纜長期運行中散熱不良或過負荷，導致絕緣材料性能劣化。

　　Poor heat dissipation or overload during long-term operation of cables can lead to deterioration of insulation material performance.

　　其他原因 ：

　　Other reasons:

　　電纜敷設位置標識不清，維護管理不當。

　　Unclear identification of cable laying locations and improper maintenance and management.

　　電纜保護措施不到位。

　　Insufficient cable protection measures.

　　材料質量不合格，如保護套管抗壓強度不足。

　　The material quality is unqualified, such as insufficient compressive strength of the protective casing.

　　為了避免電纜被挖斷，應采取的措施包括：

　　To avoid cable breakage, measures should be taken including:

　　架空電纜或在沿墻敷設的電纜上加遮蓋，地埋電纜應有明顯標識。

　　Overhead cables or cables laid along walls should be covered, and buried cables should be clearly marked.

　　提高電纜頭的安裝質量，確保電纜頭密封性良好。

　　Improve the installation quality of cable heads and ensure good sealing of cable heads.

　　加強電纜外層的維護，定期涂刷瀝青等防腐材料。

　　Strengthen the maintenance of the outer layer of the cable and regularly apply anti-corrosion materials such as asphalt.

　　安裝避雷器，提高系統自動保護的科技水平。

　　Install lightning arresters to improve the technological level of automatic protection in the system.

　　定期對電纜進行預防性耐壓測試，及時更換絕緣降低的電纜。

　　Regularly conduct preventive voltage withstand tests on cables and replace cables with reduced insulation in a timely manner.

　　城市建設時應有統一的線路規劃，避免施工時誤挖

　　There should be a unified route planning during urban construction to avoid accidental excavation during construction

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