A power-line transient recorder

Those who have been associated with the industry during recent years have witnessed a most progressive expansion and improvement of electric power generation and distribution facilities. This growth has been accompanied and perhaps preceded in many instances, by improvements in instrumentation techniques and equipment. The recorder described here has capabilities which exceed those of similar recorders in general use. It provides a means of recording waveforms which exist in a power system immediately prior to, during, and after the occurrence of a fault or other disturbance without continuous consumption of photographic recording medium. This instrument will record current and voltage waveforms, or other waveforms if desired, as long as required after the disturbance occurs.