Transient Control Levels: A Proposal for Insulation Coordination in Low-Voltage Systems

Failure and circuit upset of electronic equipment due to transients is a problem now and is one which has promise of becoming more of a problem in the future as trends continue toward miniaturization and circuit complexity. Protection methods are used more or less extensively and often haphazardly. At present, there does not appear to be a clear approach toward achieving compatibility between the transient withstand capability of devices and the transients to which such devices are exposed. A more scientific approach is needed to guide manufacturers and users of equipment. The purpose of this paper is to promote a concept of transient coordination for electronic and other lowvoltage equipment through the establishment of a system of Transient Control Levels, similar to the concept of Basic Insulation Levels so successfully used for many.years in the electric power industry. Specific suggestions for possible Transient Control Levels and standard test wave shapes are made, in order to promote wide discussion as to whether these waveforms and levels are the best that can be developed toward good transient coordination for the electronic industry.