ON-LINE CONDITION MONITORING OF POWER TRANSFORMERS

Abstract

Power and distribution transformers are useful elements in the transmission / distribution system. They are required to attain very high level of operational reliability and long life. Failure of a transformer is a havoc for the production units and consumers with a heavy loss of revenue. Also the transformer is a costly equipment at the sub station. Various types of procedures are performed to ensure that they have and maintain the prescribed level of q>iality in manufacturing as well as in operation. The major factors which clearly indicate the performance of transformers are temperature rise, state of insulation, reactance, quality of oil, no load current, strength to tolerate abnormal operating conditions such as over load, under fault and voltage surges etc. For a stable, reliable and efficient performance during normal service and also during a quality control process after manufacturing., it is essential that the most of parameters which define its characteristics can be measured as precisely, accurately and economically as possible. Also the measurement procedure should be fast, accurate and easy for the people performing them. For effective maintenance and quality control the precise value of test parameters must be available at real operating tine with a minimum effort by the person taking the value of parameters. The Intel's 8031 based system for monitoring- various parameters-of- Transformer (on line) is developed using 8 channels ADC (0809) along with temperature measurement circuits, wave shapers & amplifiers