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发明授权
CN108519537B 一种电缆金属护套多点接地下大地漏电流计算方法 有权

一种电缆金属护套多点接地下大地漏电流计算方法
摘要：
本发明公开了一种电缆金属护套多点接地下大地漏电流计算方法，该方法包括下列步骤：S1、测量电缆两端接地电阻R1和R2，计算大地漏电阻Re；S2、三相电缆金属护套依次发生(s‑1)、(m‑1)、(n‑1)个故障接地，将各故障接地支路依次排开，计算任意相邻接地支路间距占线路总长度比例αλ；S3、计算各分段大地漏电阻Reλ；S4、测量(s+m+n‑3)个故障接地电阻Rki、Rgj、Rft；S5、确定系数矩阵A；S6、计算各段大地漏电流向量Ie。本发明切实可行的提出了一种电缆金属护套多点接地下大地漏电流的计算方法，可方便计算多点接地状况下各段大地漏电流。
摘要（英）：

The invention discloses a ground leak current calculation method under cable metal sheath multi-point grounding. The method comprises the following steps: S1, measuring grounding resistance R1 and R2at the two ends of a cable, and calculating the ground leak resistance Re; S2, subjecting the (s-1), (m-1), (n-1) fault grounding to a three-phase cable metal sheath, sequentially arranging the faultgrounding branches, and calculating the ratio alpha lambda of the distance between the adjacent grounding branches to the total length of the line; S3, calculating the ground leak resistance Re lambdaof each section; S4, measuring (s+m+n-3) fault grounding resistance Rki, Rgj, Rft; S5, determining a coefficient matrix A; and S6, calculating the ground leak current Ie of each section. The invention feasibly provides the ground leak current calculation method under cable metal sheath multi-point grounding, and the ground leak current of each section under the multi-point grounding condition canbe conveniently calculated.

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