High-precision current sampling system for online monitoring of CVT

Abstract

The invention discloses a high-precision current sampling system for online monitoring of a CVT. The system comprises a signal conversion unit, a data acquisition and processing unit and an industrialcomputer; the signal conversion unit comprises a plurality of micro-core-penetrating type current transformers for realizing non-invasive sampling; the data acquisition and processing unit is used for time service through a GPS module, analyzing and processing the sampling data by adopting a fast fourier transform interpolation algorithm, and uploading the analysis result to the industrial computer; and the industrial computer receives the data sent by the data acquisition and processing unit and bears the tasks of data storage and display. Compared with an existing acquisition system, the system transfers the data processing task to a lower computer, so that the burden of the upper computer is reduced while the measuring precision is guaranteed.

Description

technical field [0001] The invention relates to a high-precision current acquisition system for CVT online monitoring, and belongs to the technical field of real-time data acquisition and online monitoring of intelligent substation equipment. Background technique [0002] During the long-term operation of electrical equipment, hidden dangers such as insulation aging and mechanical fatigue will gradually occur, which will reduce the reliability of the equipment and affect the reliable and stable operation of the power grid. For a long time, in order to ensure that electrical equipment is in good working condition, periodic power outages are generally used to check, which may lead to insufficient and overhauled problems. In order to overcome the defects of power failure, the application of online monitoring technology is more and more extensive. Online monitoring effectively solves the problems of insufficient and excessive maintenance, saves a lot of manpower, and improves t...

AI Technical Summary

Problems solved by technology

Practice shows that this scheme has certain limitations: (1) In order to carry out subsequent calculation and analysis, a large amount of data needs to be collected in each sampling cycle, and the transmission process of these data will occupy more resources of the host computer and the lower computer , which affects the real-time performance of the entire system, and the storage and reading of a large amount of data is also a burden on the host computer; (2) The algorithm itself used to process the collected data is relatively complex, while the processing capacity of the host computer is fixed , so using the host computer to analyze the data collected by multiple channels at the same time, it is bound to increase the cost to improve the computing power of the host computer, which also limits the number of sampling channels

Passive compensation methods include turns compensation, shunt capacitor compensation, etc., but these compensations can only shift the error curve and cannot change the shape of the error curve

Active compensation requires additional electronic circuits, and the structure is complex and inconvenient to debug

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