A METHOD FOR DETERMINATION OF VISCOSITY AND REACTIVITY OF A HARDENER-RESIN MIX FOR IMPROVED IMPREGNATION OF TURBO-GENERATOR IN A VACUUM PRESSURE IMPREGNATION (VPI) PROCESS

摘要

The invention relates to a method for determination of viscosity and reactivity of a resin- hardener mix for improved impregnation of turbo-generator in a vacuum pressure impregnation (VPI) process, the method comprising the steps of measuring the viscosity (V) and reactivity (R) at a resin mix, and concluding applicability of the resin- hardener mix, if V40cp, and R9 cp; determining gel-time (t) at impregnation temperature if viscosity (V) and reactivity (R) of the resin mix is more than 40cp and 9cp respectively; rejecting the resin- hardener mix of gel-time (t) is less than 5-hours; determining cure initiation temperature (T) if gel time of the resin- hardener mix is more than 5 hours; rejecting the resin- hardener mix, if T65°C; measure the variation of viscosity and reactivity if T65°C, and concluding the applicability of the resin- hardener mix, if V 40cp, and R 9cp at impregnation temperature range; and rejecting the resin- hardener mix, if variation of viscosity and reactivity is more that 40cp and 9cp respectively.