Method for online detecting abnormity of hydro-generator air cooler

Abstract

The invention provides a method for online detecting abnormity of a hydro-generator air cooler. The method comprises the steps of setting a generator stator core normal temperature value, a highest temperature alarm value, an air cooler normal fluid temperature difference and an alarm value; obtaining a temperature value of a generator stator core, water inlet and outlet temperatures of an air cooler, cold air and hot air temperatures, active power, exciting current, a water turbine guide vane opening degree and a generator set working water head; calculating an average value and a temperaturedifference value of each parameter; establishing a mathematical model to obtain the current highest temperature value of the stator core and the current fluid temperature difference of the cooler; calculating the highest temperature of the stator core and the slow variable of the fluid temperature difference of the cooler; and calculating the maximum temperature of the stator core and the first-stage and second-stage alarm prediction values of the fluid temperature difference of the air cooler, detecting that the air cooler of the hydro-generator is abnormal, formulating maintenance and processing plans and measures, and processing the air cooler.

Description

technical field [0001] The invention relates to an online detection method for an abnormality of an air cooler of a water turbine generator, and belongs to the technical field of failure detection of generator auxiliary equipment. Background technique [0002] The abnormality of the air cooler of the hydro-generator is a common equipment failure in hydropower stations. The main reasons for the abnormality of the air cooler of the hydro-generator are: 1) The design of the air cooler is unreasonable, and the cooling power does not meet the requirements; 2 ) The air cooler leaks water or the cooling water pressure drops; 3) The water supply and drainage pipes of the air cooler are blocked, and the cooling water flow rate is reduced; 4) The water pipes of the air cooler are fouled, and the heat exchange efficiency is reduced; 5) The cooling water supply temperature of the air cooler rises High; 6) The sealing performance of the generator is reduced, and there is air leakage. Wh...

AI Technical Summary

Problems solved by technology

Conventional detection and analysis methods require manual intermittent statistics and analysis of generator active power, stator current, stator core temperature, cooling water inlet and outlet temperature, cooling water flow, and cooling water pressure in the computer monitoring system , easily affected by factors such as the operating conditions of the generator and the technical experience of statistical analysts, there are problems such as low analysis efficiency and poor real-time performance. Manual analysis and elimination of the iron core temperature rise, inlet and outlet water temperature, and hot and cold air temperature changes caused by the abnormality of the air cooler are low in efficiency; 3) It is easily affected by the technical experience of statistical analysts; 4) Air cooler The temperature changes of hot and cold air and stator core are greatly affected by the working conditions of the generator, and the accuracy rate is low

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