35kV单芯电力电缆金属屏蔽层交叉互联接地错误的分析与处理

Analysis and treatment of grounding fault of 35kV single-core power cable metal shielding layer cross interconnection

交流系统单芯电力电缆在运行中金属屏蔽层会产生感应电压。为了人员安全和电缆的正常运行,一般通过直接接地、交叉互联接地等方法限制电缆金属屏蔽层的感应电压在允许范围内,但在施工过程中,往往由于某些原因会导致交叉互联出现错误,使金属屏蔽层感应电压不能得到有效限制,从而引发电缆烧毁和电击伤人等事故。本文以一35kV单芯电力电缆金属屏蔽层交叉互联接地错误实例进行分析,并对交叉互联接地错误采取补救措施。

The metal shielding layer of AC single-core power cable will produce induced voltage during operation. In order to ensure the safety of personnel and the normal operation of the cable, the induction voltage of the metal shielding layer of the cable is generally limited within the allowable range through direct grounding, cross-connection grounding and other methods. However, in construction, due to some reasons, cross-connection errors will often occur, which will prevent the induction voltage of the metal shielding layer from being effectively limited, thus causing accidents such as cable burning and electric injury. Here, an example of a 35kV single-core power cable metal shielding layer cross-connection grounding fault is analyzed, and remedial measures are taken for the cross-connection grounding fault.