GENERATOR NEUTRAL GROUND MONITORING DEVICE UTILIZING DIRECT CURRENT COMPONENT MEASUREMENT AND ANALYSIS

摘要

A device and method for detecting and analyzing faults in a generator stator are disclosed. The device and method include measuring a direct current component of a neutral ground current in a generator stator grounding conductor, analyzing the direct current flow and comparing it with other ground fault indicators, and providing diagnosis and recommended actions based on the analysis. The direct current flow is measured by a sensitive direct current sensor that may also measure AC components via oscillations in the current measurement, such as a Hall Effect sensor, placed on the generator stator grounding conductor. The analysis of the direct current signal includes consideration of the generator operating conditions and environmental conditions, and also includes comparison to historical data representing both normal and abnormal operation of the generator. Alarms and advisories are provided when generator faults are detected or predicted.

主权项

1. A generator neutral ground monitoring device, said device comprising:
a direct current (DC) sensor placed on a stator neutral ground lead of a generator, said DC sensor measuring a direct current component of a generator neutral ground current and providing a DC neutral ground signal; an operating environment data module which provides generator operating environment data, where the operating environment data includes generator operating condition data and ambient condition data; and a monitor module including a processor and a memory, said monitor module being configured to receive the DC neutral ground signal and the operating environment data, analyze the DC neutral ground signal in consideration of the operating environment data to detect and predict faults in the generator, and issue an alarm or a diagnostic message if a fault is detected.