Large-scale hydro-generator stator winding partial discharge analysis system

Abstract

The invention relates to a large-scale hydro-generator stator winding partial discharge analysis system, which comprises a time-delay-free conversion system, a synchronous signal clock system, a partial discharge signal high-speed acquisition system and a partial discharge data analysis system. The time-delay-free conversion system accesses a voltage signal from a generator outlet high-voltage test loop; then the voltage signal is linearly reduced and then is respectively input into a synchronous signal clock system and a partial discharge signal high-speed acquisition system, and the synchronous signal clock system is used for generating a synchronous clock signal synchronous with the voltage signal; the partial discharge signal high-speed acquisition system is used for performing high-pass filtering, analog-to-digital conversion and storage on the reduced voltage signal; and finally, the partial discharge data analysis system is used for processing the partial discharge data. According to the partial discharge analysis system, the data calculation amount and the configuration cost can be greatly reduced.

Description

technical field [0001] The invention relates to a partial discharge analysis system for stator windings of large hydraulic generators, belonging to the field of insulation state evaluation of stator windings of large hydraulic generators. Background technique [0002] my country has built large-scale hydropower stations with an installed capacity of 10 million kilowatts such as the Three Gorges Project, Xiluodu, and Wudongde. The stator winding insulation system of a large hydroelectric generator is relatively complex, including the main insulation, the semiconductor layer in the slot, the anti-corona layer at the end, etc.; at the same time, it has the characteristics of high operating voltage, the highest has reached 24kV. In recent years, due to factors such as dispersion of process quality in the process of localization of stator winding insulation materials, many large-scale hydro-generator stator winding insulation faults have occurred. [0003] Stator winding insulat...

AI Technical Summary

Problems solved by technology

As a result, the main partial discharge measurement equipment currently on the market still stays at the MHz level

Practical experience shows that the time width of partial discharge pulses of large hydro-generators is less than 1 μs, and MHz-level measuring equipment may "miss" part of partial discharge pulses, and it is impossible to ensure that the maximum value of a single pulse is captured. Large fluctuations, unable to ensure the accuracy of test results

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