Optimizing Preventive Maintenance of Generator Excitation Systems to Improve Power Plant Reliability and Performance

Generators are key components in power plants that convert mechanical energy into electrical energy through the interaction between the magnetic field and the rotor windings. The excitation system of a generator, responsible for providing the initial magnetic field, plays a crucial role in this process. Preventive maintenance of the excitation system is essential to maintain reliability and optimal performance. Insulation resistance (IR) testing and brush length measurements are important indicators in evaluating the condition of the exciter. The test results indicate that routine cleaning can significantly improve resistance values, bringing them closer to or exceeding the expected standards. Additionally, brush length measurements suggest the need for special attention to brushes that have reached or exceeded the minimum threshold of 65 mm, as per the 1995 First Year Inspection (FYI) standards. Four brushes identified with the note “Replace” must be replaced immediately to prevent serious disruptions in the power generation system. With proper routine maintenance, the generator excitation system can remain in optimal condition, preventing serious issues in the future and ensuring the reliable performance of the power plant.