| 摘要 |
A method and an apparatus for monitoring the degree of exposure of an electric arc within a furnace having a molten charge, in which alternating signals are derived directly from the furnace supply and are converted into an equivalent dc level. These alternating signals are also high pass filtered and subsequently converted into an equivalent dc level. The dc signals are ratioed to produce a ratioed output which is compared with a set level established from characteristic frequency spectra of the waveforms of the alternating signals associated with (a) arc exposure and (b) arc submersion, whereby, when the set level is exceeded, an indication is provided of the degree of arc exposure. |
