On-load tap changer top cover deformation monitoring and protecting integrated device and method

Abstract

The invention discloses an on-load tap changer top cover deformation monitoring and protecting integrated device and method. The device comprises an oil pressure starting unit and a strain monitoring unit; the oil pressure starting unit and the strain monitoring unit are disposed on a converter transformer tap changer top cover; the oil pressure starting unit comprises a high-frequency dynamic oil pressure sensor; the strain monitoring unit comprises a strain sensor; and the strain monitoring unit is also connected with an alarm unit and a tripping unit. The device and method have an irreplaceable protection effect on reliably and quickly identifying the plastic deformation of the top cover. The device and method have important engineering practical significance for transformer operation personnel to accurately and reliably acquire internal oil pressure of the oil chamber of the transformer tap changer and the deformation data of the top cover of the transformer tap changer in real time and evaluate the safe operation state of a transformer. The device can reliably operate for a long time, is not influenced by strong electromagnetism and greasy dirt environment, has the advantages of high response speed and high measurement frequency, does not inject harmonic waves into a power system in the operation process, and does not influence the normal operation of primary and secondary equipment in a transformer substation.

Description

technical field [0001] The invention belongs to the field of electric equipment monitoring, and relates to a device and method for monitoring the state of the top cover of a converter transformer on-load tap changer, which is used for monitoring, analyzing, diagnosing, and recording the phase change state characteristics of the top cover of a tap changer switch of a converter transformer, so as to realize fault discrimination And cut off, while evaluating the operation status of the pressure regulating switch and the converter. Background technique [0002] The safe operation of the power grid is the basis for ensuring continuous and stable power supply, and it is also the guarantee for the safety of the power grid itself. With the rapid development of UHV DC transmission projects, the operation of power grids puts forward higher requirements for the safety and reliability of power transmission and transformation equipment. Different from the AC components in the system, th...

AI Technical Summary

Problems solved by technology

Since 2017, there have been a number of major converter transformer fire accidents in China. The accidents caused the destruction of some transformer equipment, causing adverse effects and major economic losses.

In these accidents, the top cover of the tap changer ruptured and exploded due to the sudden rise of the faulty oil pressure in the oil chamber. Therefore, an integrated device and method for monitoring and protecting the deformation of the top cover of the on-load tap changer is urgently needed

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