What is the difference between a transformer having a missing phase and being grounded?

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This post was last edited by shrien on 2015-7-22 at 18:47. For a three-phase transformer, the absence of one phase has no impact on its operation; however, if a phase is missing, the three-phase voltage supplied by the transformer becomes abnormal, and the three-phase loads cannot operate. Therefore, a three-phase transformer must not operate with a missing phase. There are two scenarios regarding transformer grounding. In our **6KV and 35KV low-current grounding systems, if a transformer or line is grounded, the system can still operate normally; however, such grounding indicates a fault in the transformer or line, and it is necessary to identify and resolve the grounding fault within 2 hours. If the fault is not identified within 2 hours, power must be cut off to prevent the incident from escalating. Transformers in systems of 110 KV and above are all part of high-current grounding systems; grounding will cause a short circuit and lead to tripping, so operation with grounding is not possible.