A water-turbine generator set stator thermal expansion dynamic monitoring and analysis method

Abstract

The invention relates to the technical field of water-turbine generator set monitoring and in particular provides a water-turbine generator set stator thermal expansion dynamic monitoring and analysismethod. The method comprises the steps of: 1, installing four or eight air gap sensors (flat capacitance sensors) at the upper portion or the lower portion of the inner wall of a stator; 2, performing data collection and calculation: during a set operation process, collecting data via the air gap sensors and acquiring the air gap value of each sensor, and determining an air gap value when the setreaches a steady state from cold state start; 3, acquiring a current air gap value in real time, calculating a stator thermal expansion value based on the current air gap value and the air gap valuein the steady state, and analyzing stator states according to the stator thermal expansion value. Air gaps of stators and rotors of generators are monitored and stator thermal expansion value is dynamically measured according to the changes of the air gaps; the method can measure stator thermal expansion value dynamically and provide proof for evaluation of stator states.

Description

technical field [0001] The invention belongs to the technical field of hydroelectric generating set monitoring, and in particular relates to a dynamic monitoring and analysis method for thermal expansion of a hydroelectric generating set stator. Background technique [0002] With the increase of the single installed capacity of hydroelectric generating units, the proportion of hydropower in the entire power system is increasing, and the power system also puts forward higher requirements for its operation reliability. Therefore, it is necessary to ensure the safe and reliable operation of the units , while reducing equipment maintenance costs and improving unit operating efficiency. At present, the online monitoring and fault diagnosis of hydroelectric generating units has become one of the research hotspots in power system production and scientific research departments. Using a high-performance computer to monitor the real-time status of the unit on-line, it is possible t...

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Problems solved by technology

When the stator core is designed, most of the positioning ribs adopt a flexible rib structure, and the expansion allowance of the stator core is often reserved to allow the thermal expansion of the stator core to a certain extent. Abnormal thermal expansion of the stator, such as uneven thermal expansion or excessive expansion, is usually due to the dovetail of the positioning rib and The long-term thermal expansion of the stator core is abnormal due to the pinning of the iron c

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