该装置可大大提高煤矿供电系统的安全可靠性。

The device improves the security of the colliery power distribution system greatly.

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因此，为保证牵引变电所安全、稳定、优质、不间断的供电，提高牵引供电系统的安全可靠性就具有重要意义。

Traction substation should be safe, steady, effective and continuous, so it is very important to improve the system's security and reliability.

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