rare compared to asymmetric faults. There are two kinds of symmetric fault, which are line-to-line-to-line (L-L-L) and line-to-line-to-line-to-ground (L-L-L-G). Symmetric faults account for 2 to 5% of all system faults. However, they can cause very severe damage to equipment even though the system remains balanced.

Internal fault and external fault

Many pieces of the grid equipment can develop internal problems. For these devices, the faults can be classified into internal and external faults. An internal fault is a fault developed

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