To facilitate our customers' needs in complying with this latest government legislation, Halcyon Drives carry out pre & post harmonic surveys to G5/4-1. Thes surveys are particularly important when carrying out any new installations or adding any additional drives on site that may have a bearing on the total harmonic loading.
A Site Survey for the purpose of establishing the present levels of Harmonic Distortion can be carried out and would include:
ASSESSMENT OF EXISTING SITE CONDITIONS
To conduct a Harmonic Survey it is necessary to establish the present site conditions. This includes investigation of the supply transformers; establishment of the Point of Common Coupling (PCC); assessment of the single line distribution including pertinent ancillary equipment such as Power Factor Correction equipment; method of connection of the monitoring equipment.
CONNECTION OF MONITORING EQUIPMENT
Site visit to connect the Monitoring Equipment.
DISCONNECTION OF EQUIPMENT
Site visit to disconnect monitoring equipment after a pre-determined monitoring period.
PRODUCE A REPORT OF THE FINDINGS
To include all information required under G5/4, an associated computer program would be used to interpret current site results and predicted harmonic levels will confirm a customer solution to ensure current legislation compliance can be achieved.
As a result of the high level of distortion recorded primarily in the 5th harmonic, which would be worsened by the installation & operation of these drives, Halcyon Drives recommended the fitting of a power quality filter manufactured by ABB.