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 61619-1:1997
This norm indicates at 2 mg/Kg the limit of determination of total PCBs (as sum of the congeners present) and at 0.1 mg/kg per chromatographic peak (referred to one or more congeners and/or coeluents).
This method is applicable for new oils, oils subject to a reclaiming treatment (including de-chlorination, both treated chemically and physically) and insulating liquids in operation contaminated by PCBs. (Scope of IEC 61619 ed. 1-1997).
EN 12766-1:2001
EN 12766-2:2004
EN 12766-3:2005
For the PCBs analytical test Sea Marconi received the accreditation by Accredia (internationally valid).
The test reports referred to the analytical determination of PCBs should indicate the correct application of the norms, the requisites of competence and quality of the laboratory tests (EN ISO/IEC 17025, EN ISO 9001).
On the test reports should be indicated the measurement uncertainty [Note 1, CLC/TR 50503:2010 (page 12)]
With the PCBs analysis in oil
you can check the contamination of your transformer
Screening of PCBs by Kit SM-TCPS
The SM-TCPS by Sea Marconi are able to determine the total chlorine. If the chlorine concentration is below the concentration limit (of PCBs equiv.) prescribed by local norms, it can be scientifically predicted that the sample analysed is PCBs free. If the chlorine concentration is above the concentration limit (i.e. 50 mg/kg) it is necessary to determine the real concentration of PCBs by the prescribed methods.
IThe Kit SM-TCPS are ideal for field applications aimed at the verification of cross contamination, but are also very useful in laboratory to prevent the use of expensive instruments, avoiding the intervention of qualified personnel and reducing significantly the response time. (more info)
