Critical issues

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The sampling of the oil must be carried out in accordance with the procedures by qualified operators The laboratory analyses must be carried out in accordance with the methods indicated by the norms of reference, as guaranteed by accredited laboratories The countermeasures to the “PCBs in oil and transformer” criticality, specifically the decontamination of the transformer and the dehalogenation ofRead more

For the diagnosis of the “PCBs in oil and transformer” criticality, Sea Marconi applies its own diagnostic metrics, specifically: Through the analysis of the oil the specific indicators (PCBs) are identified The concentration of PCBs in new and in operation oils must be “non-detectable” that is PCB < 2 mg/Kg, determined with method IEC 61619 [IEC 60296 Ed. 4-2012, pageRead more

Symptoms (analysis) The specific symptom of the “PCBs in oil and transformer” criticality is correlated to the presence of: PCBs in the oil in concentrations exceeding those prescribed by the norms of reference (see below). The analytical determinations of the content of PCBs must be performed using the following methods of reference: IEC 61619-1:1997Insulating liquids – Contamination by polychlorinated biphenylsRead more

To define the action priority and the choice of the countermeasures it is necessary to consider the following indicators: Click to open– type, size and total mass of the electrical equipment, – installation of the electrical equipment; – the financial value of the electrical equipment and the decontamination/disposal costs, – type and quantity of insulating liquid, – concentration of PCBsRead more

 It is recommended to carry out (and keep constantly updated) the inventory of transformers with the indication of the equipment contaminated by PCBs exceeding the prescribed thresholds during all the phases of the life cycle.  It is recommended to modify the maintenance practices by: acquiring PCBs-free new oils verifying the oils during the acceptance phases of the supply according toRead more

The “PCBs in oil and transformer” criticality is caused by the implementation of improper management practices of transformers and insulating liquids. This condition is generally classified as “crossed contamination”. The improper practices indicated above have an impact on the various phases of the life cycle of electrical equipment with insulating liquids. Causes and Steps of the life cycle Causes ofRead more