The main reason that casing falls to the hole by breaking off thread is casing thread quality can't reach the criteria, and the management of casing running into the hole is not strict.
套管脱扣落井的主要原因是套管扣加工质量达不到规范要求，以及套管入井管理不严造成的。
This article analyzes the causes of fever of parts of GW5 type switch and puts forward the recondition quality and criteria to ensure the safety running and reliable power supply.
文章分析了GW5型闸刀各部位发热的原因，提出了各发热部位的检修质量及标准。
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