Research on Portable Relay Protection Devices and Multi-source Information Operation and Inspection Devices
In power plants,the traditional setting printing of relay protection devices uses dot matrix printers.Manual comparison and printing of setting sheets and setting value preset sheets requires a lot of work,and it is easy to cause problems such as misjudgment and missed judgments.Based on the above problems,this paper carries out research on a multi-source information operation and inspection device for portable relay protection equipment.The device obtains data through the printing port of the relay protection device to achieve non-intrusive fixed value printing.Then this device has two verification modes.The first one is to automatically verify the setting value by comparing the value of a generic expression to compare the current setting value in the relay protection device with the preset value in the portable device.The second method is image comparison.By using the PDF file linear recognition character method(LDA)to classify the text,and then using the cosine similarity and difference to compare whether the characters are exactly the same,the fixed-value electronic files and relays issued by the dispatch can be realized.Accurate comparison of printed value sheets for protective devices.The application of this device can improve the accuracy of image comparison and improve the efficiency and accuracy of fixed value verification.
portable relay protection device with multi-source information operation and inspection systemimage comparisonPDF file linear recognitioncosine similaritysetting value verification
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