Grounding issues in the polysilicon production process

Early grounding fault. 1. It may be that the electrode insulating sleeve has been burned black, or deposits have accumulated on it, resulting in a reduced insulation level of the sleeve and thus causing the furnace to stop operating due to grounding of the chassis ； II. It may also be due to the fact that, during the initial growth phase of the silicon core, the outer ring of the silicon core was blown sideways by the material against the inner wall of the furnace, thereby causing the furnace to stop operating due to grounding issues.

Additionally, corresponding tracking and verification can be carried out based on the above two possible scenarios. The steps are as follows: 1. After shutting down the furnace and lifting the furnace cylinder, pay attention to checking whether the silicon core is tilted toward the inner wall of the furnace. If it is tilted significantly but not against the furnace cylinder, it may be that the sharp end of the crossbeam is discharging electricity toward the furnace cylinder, resulting in grounding ； If it is in direct contact with the furnace cylinder, it must be the silicon core coming into contact with the cylinder that causes the grounding fault (when lifting the furnace cylinder, it must be lifted very slowly; otherwise, it will be difficult to observe the relevant phenomena) ； 2. After lifting the furnace cylinder, carefully inspect the insulated PTFE sleeve for any discoloration or deposits. (After lifting the furnace cylinder, do not rush to remove the silicon core and the PTFE sleeve; after inspection, a high-voltage resistance test must be conducted on the chassis.) Whether there are any issues or not, proceed to step 3 after observing the conditions ； 3. Conduct a high-voltage resistance test on the chassis. If the test is successful, then the problem lies not with the PTFE sleeve; the cause should be considered in terms of the silicon core and the thermal load during production. If the test fails, in addition to insulation issues with the PTFE sleeve, it is also necessary to check for any short circuits between the electrode copper bars under the chassis, as well as any leakage of water from the electrodes onto those copper bars

The analysis upstairs is quite thorough; it has to be said that Haichuan is really strong

It may be caused by the silicon core breaking and coming into contact with the inner wall of the bell jar under high voltage, which can be observed through the viewing mirror.