EXPRESSION OF RESULTS AND REPORT OF TEST

Expression of resultsResults are calculated using the following equation:WhereG is the conductance, in siemens (S);C is the capacity, in farads (F);W is the angular frequency in radians / second (rad / s) = 2πfF is the frequency used in Hertz (Hz).NOTE - Assuming that the relative permittivity temperature measurement is known, the conductivity of the liquid can be calculated by the following equation:WhereREPORT OF TESTThe report must include the following:- Identification of the sample;- test temperature;- measured values of G and C;- As calculated values...

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Posted in: angular frequency,test temperature

SAMPLING,LABELLING AND PROCEDURES

SAMPLINGThe insulating fluid samples should be taken by qualified personnel in accordance with IEC 60475. During his storage and transport, samples should be protected from direct light.LABELLINGInsulating liquid samples must be properly labeled before being sent to the laboratory.The following information is required:- Customer or facility;- Fluid identification (type and class);- Identification of the equipment;- The date and time of sampling;- Temperature during sampling;- sampling point;- Other relevant information.PROCEDURESIn order to obtain a meaningful measure of the dissipation factor is essential to follow exactly the rules with respect to:- Careful cleaning of the test cell;- Careful filling test cell and the careful handling of liquid samples and the very test cell.Cleaning test...

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Posted in: methods,procedure,temperature