Harmonic detection and filtering - Schneider Electric
Harmonic detection and filtering - Schneider Electric
Harmonic detection and filtering - Schneider Electric
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Measuring the valuesof the indicators3.3 Anticipating harmonic conditioningneedsThe harmonic indicators can be measured:b by permanently installed devicesb by an expert present at least a half-day on the site (for a view limited in time).3.3.1 The advantages of permanently installeddevicesFor a number of reasons, it is preferable to use devices installed permanently in thedistribution system.b a visit by an expert is necessarily limited in time, whereas measurements atdifferent points in the installation over a sufficiently long period (one week to onemonth) provide an overall view of system operation <strong>and</strong> cover all the situations thatmay arise following:v fluctuation of the power sourcev variations in system operationv installation of new equipmentb measurement devices installed in the distribution system prepare <strong>and</strong> facilitatetroubleshooting by experts, thus reducing the number <strong>and</strong> duration of their visitsb permanently installed measurement devices detect any new disturbancescaused by the installation of new equipment, by new operating modes or byfluctuations on the distribution system.3.3.2 The advantages of integrated measurement<strong>and</strong> <strong>detection</strong> devicesMeasurement <strong>and</strong> <strong>detection</strong> devices that are built into the electrical distributionequipment offer a number of advantages.b for an overall assessment of the distribution system (preventive measure),they avoid:v renting the measurement devicesv hiring the services of expertsv having to connect <strong>and</strong> disconnect all the measurement devices.In an overall assessment of the distribution system, an analysis at the main lowvoltageswitchboard level can commonly be carried out by the incoming device <strong>and</strong>/or the measurement devices built into each outgoing device.b for an assessment in view of remedial action, they:v indicate the operating conditions when the incident occurredv provide a "map" of the installation <strong>and</strong> indications on the selected solution.A full diagnosis will often also require additional information provided by specificequipment suited to the problem at h<strong>and</strong>.18
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