A multi-functional automatic switching circuit for direct current ice melting and a switching method thereof are provided. The automatic switching circuit comprises at least one sub-switching circuit. The sub-switching circuit comprises a six-pulse current converter (R) with no saturable reactor, six reactors (L1a, L1b, L1c, L2a, L2b, and L2c), three three-phase knife switches (Sac1, Sac2, and Sac3), and five single-phase knife switches (SV1, SV2, SV3, SV4, and SV5). The sub-switching circuits in series connection or parallel connection, four direct current side switching knife switches (Sdc1, Sdc2, Sdc3, and Sdc4), an isolation knife switch (K), a breaker (QF) and a control and protection system (CP) may form an automatic switching circuit for six-pulse or twelve-pulse direct current ice melting. The automatic switching circuit with no saturable reactor reduces noise during operation, achieves mutually automatic switching among modes of reactor switching, ice melting and test, and may complete the through-flow test of the automatic switching circuit without switching in a power transmission line, thereby solving the problem of daily operation and maintenance.
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机译：提供了一种用于直流冰融化的多功能自动切换电路及其切换方法。自动切换电路包括至少一个子切换电路。该子开关电路包括一个无饱和电抗器的六脉冲电流转换器（R），六个电抗器（L 1 a ，L 1 b ，L 1 c ，L 2 a ，L 2 b 和L 2 c ），三个三相刀开关（Sac 1 ， Sac 2 和Sac 3 ）和五个单相刀开关（SV 1 ，SV 2 ， SV 3 ，SV 4 和SV 5 ）。子开关电路串联或并联，四个直流侧开关刀开关（Sdc 1 ，Sdc 2 ，Sdc 3 ，和Sdc 4 ），隔离刀开关（K），断路器（QF）以及控制和保护系统（CP）可以形成六脉冲或十二脉冲直流的自动开关电路融冰。无饱和电抗器的自动切换电路减少了运行中的噪声，实现了反应器切换，融冰和测试模式之间的相互自动切换，并且可以完成自动切换电路的通流测试而无需在输电线路中进行切换。解决日常运维问题。
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