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变压器是矿山供电系统中的重要设备，它的故障 会严重影响矿山供电系统，并且，较大容量的 变压器造价较高，万一损坏会带来很大的经济损失。因此，必须根据变压器的容量和重要程度配备各种保护装置，其中纵联差动保护（以下简称差动保护）是较大容量变压器的主要保护装置，?
Transformer is an important equipment in the power supply system of mine. The failure of it will seriously affect the power supply system of the mine. And the transformers of larger capacity are more costly and will cause great economic losses in case of damage. Therefore, all kinds of protection devices must be equipped according to the capacity and importance of the transformer. Among them, the longitudinal differential protection (hereinafter referred to as differential protection) is the main protection device for the larger capacity transformer.