Through contrast analysis, finds the reason of not allowed direct ground connection for transformer under the shaft.
并通过对比，找出井下变压器中性点不允许直接接地的原因。
Based on the definition about the systematic efficiency and the effective power, completed the research about the efficiency under the shaft.
根据系统效率及有效功率的定义，开展了井下效率的研究。
Since the fact that the work condition under the shaft in coal mine is comparatively odiously , electric motor block rate is particularly tall.
由于煤矿井下的工作条件比较恶劣，电动机的故障率特别高。
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