METHOD TO DETERMINE CONDITION AND RESOURCE OF INSULATING SYSTEM OF ELECTRIC EQUIPMENT Russian patent published in 2013 - IPC G01R31/02 

FIELD: measurement equipment.

SUBSTANCE: spectrum of dielectric absorption is generated for a controlled insulation gap, and according to the calibration characteristic, the drawn and the residual resource of insulation is defined, the insulation gap is previously discharged within a required interval of time, current value is measured in the selected time interval from 0 to 600 sec., controlling for this purpose the current value I(t) after equal time intervals, and the value of leakage current Iym. is assessed, from such produced spectrum representing a curve t*I(t)=f(t), stretching via the maximum, two main strips of absorption are identified, at the same time they monitor the value of maxima of the first and second absorption strips and their position on the time axis, information is received on condition of dielectric materials, controlled insulation gap, and the value of the resource is assessed by the value of generalised polarisation index, which represents maximum value of the function t*I(t), by means of comparison with the rated value characterising the condition of the average statistic gap, the ageing process of which is represented in the form of a mathematical model, generated on the basis of results of condition N control on the equipment actually operated for a long time, where N - integer number selected from the ratio N≥70.

EFFECT: higher validity of assessment of condition of insulating gaps of power equipment operating for a long time.

2 dwg