Practical solutions for the shutdown process in industrial facilities depending on network disturbances

Power supply market liberalisation as well as an increase in the user equipment sensitivity to network disturbances lead to a growing requirement for high quality and power supply continuity. CESI has been working for a long time in co-operation with ENEL experts of the former Research Division now incorporated into CESI in the quality supply field on any topic providing for monitoring and improvement. In other words: definition of the network and interface standards with any user equipment; disturbance type definition; survey methods in the field of disturbance by means of dedicated instruments; susceptibility analysis of user equipment inclusive of laboratory testing, analysis simulation and field analysis; and screening method study relating to user equipment both through specific interventions on end user equipment and by fitting continuity external control devices (uninterruptible power supplies etc.). The paper partially summarises the on-site activity at some specific industrial facilities aiming at desensitising user equipment from voltage dips and short interruptions by means of measures of low impact and cost for the end-users. Surveyed disturbance types lead to voltage dips and short-interruptions, the commonest and most widespread and dangerous disturbance type as far as the end-use equipment operation is concerned. The activity described was fulfilled in a glassworks, a cement factory, a textile company and an electronic industry (CD production)