CANADIAN NATIONAL POWER QUALITY SURVEY - FREQUENCY AND DURATION OF VOLTAGE SAGS AND SURGES AT INDUSTRIAL SITES

The occurrence of voltage sags and surges originating on the primary a nd secondary sides of industrial facilities can disrupt continuous and noncontinuous industrial computer processes, a costly issue for socie ty. This paper will attempt to answer several questions concerning the frequency and duration of voltage sags and surges posed by industrial customers, The answers to these questions will be based on the nation al survey results [1], [2] of the frequency and duration of voltage sa gs and surges at industrial sites monitored at their utilization volta ge levels (e,g,, 120, 347 V) and on the utility primary side of their facilities, The survey results provide a knowledge base for monitoring , designing, and utilizing voltage sag and surge mitigating technologi es.