AN EMBEDDED DEVICE AND A METHOD FOR DIRECT DETERMINATION OF DEGREE OF POLYMERIZATION OF CELLULOSE BASED PAPER INSULATION OF A TRANSFORMER

摘要

The present invention relates to an embedded device and a method for estimation of degree of polymerization (DP) of cellulose based paper insulation of transformer comprising means for collecting cut paper samples from the leading ends of a transformer, means for conveying said collected papers through the embedded device, comprising five set of rollers (1 to 5) for squeezing of oil from the test insulation paper, cleaning the paper with a solvent, drying the sample paper with heating means (H) controlled with a electronic circuit, and to drag out the paper out of the machine respectively. In between fourth and fifth set of rollers are provided a shredding means (SM) with punches to cut the paper into small circular pieces and a paper chip chute conveyor ( c) for transporting the small pieces of paper to a digital moisture balance (W) to weigh the initial and dried out weight and moisture content of the paper samples. The preweighed and dried paper sample pieces are dissolved in a glass flask (F1 & F2) containing predetermined amount of DM water and CED by shaking in a shaker assembly. The efflux time for blank and sample solution is recorded via sensor in a builtin digital analog computer by noting 1st and 2nd signal for corresponding 1st and 2nd mark for the said blank and sample solution, to give a measure of viscosity of the solution, DP of the sample paper through a software using Martin's curves, all the operations of the rollers, shredding means and chute conveyor are controlled through an integrated PC with controller circuit via a RS 232 port.