STATOR WATER SYSTEM MONITORING FOR LARGE TURBO-GENERATOR- A USER’S PERSPECTIVE

摘要

In the developing countries like India, the primary focus of utility is to make the units available to its maximum and minimising the maintenance duration. Simultaneously, these units have to run continuously at base load ensuring the high reliability. The present IEC standards for Electrical Rotating Machines are referred for testing to establish the performance and quality of the large electrical machine, however they do not specify limits or trending of various operating parameters of generator Stator Water System, which needs to be continuously monitored. The availability of different designs of turbo-generators Stator Water systems calls for understanding the basic ingredients of the system, their function and how the system can perform its best. The paper covers a brief on the types of Generator Stator Water systems, their advantages and disadvantages, design requirements & monitoring of critical parameters along with permissible associated limits. The process of corrosion in hollow strands, crevice corrosion on clip to strand joint and various steps to check corrosion right at incipient stage have been discussed. A few designs experienced by the user for stator water system have also been summarised.