NEW GENERATION VOLTAGE REGULATORS WITH MICROPROCESSOR FOR AUTOMATIC CONTROL OF POWER TRANSFORMERS WITH ON-LOAD TAPCHANGERS

Automatic voltage regulation of power transformers by means of on- load tap -changers (OLTC) isvitally necessary in today's electrical networks and industrial processes. The author's company has an early recognized of this important issue and after several years of research has developed a new microprocessor technigue which leads to a new generation in automatic voltage regulations. The microprocessor voltage regulat o r s has a dvantage to bloek the undesired tap changing operation which could be a case in present analogues regulators. An outlook on the advantages of this new microprocessorcontrolled voltage regulators is giver very briefly in this paper. The main advantages of this technique compared with the conventional analogue voltage regulators used for many years in electrical networks and industries are briefly as follows: - Intercommunication capability - Higher measuring accuracy - Absolute setting accuracy of the parameters - New concept for parallel operation of power transformers - Full compatibility with analogue voltage regulators in ser vice