(1) Control the interval time and length of the lower electrodes. If the electrode is soft, you should take the approach of frequent release, less release or late release. If it is too dry, allow more release.
(2) When the electrode is discharged, the load decreases and increases. If the electrode is soft, a large amount of current will pass along the surface of the electrode, and the electrode shell may be burnt due to current impact. Therefore, under normal circumstances, the load must be reduced when the electrode is discharged, and the full load shall not be restored all at once after the electrode is discharged.