Data measurement and storage system and method for achieving high frequency and ultra-high frequency partial discharge monitoring of transformer

Abstract

The invention discloses a data measurement and storage system and method for achieving high frequency and ultra-high frequency partial discharge monitoring of a transformer. The system comprises a data collection unit, a data measurement unit and a data storage unit, wherein the data collection unit is used for collecting high frequency partial discharge signals and ultra-high frequency partial discharge signals; the data measurement unit is used for measuring data at a signal output end of the data collection unit to obtain characteristic values of signals reflecting a failure; and the data storage unit is used for storing the data at a signal output end of the data measurement unit, and displays a failure result. The data measurement storage system and method have the advantages that the available primary measures for the partial discharge monitoring are integrated; the seamless switch of various testing methods is achieved; difficulties such as testing blind areas, complicated partial discharge and external interference that a single partial discharge monitoring method encounters are overcome; the system is simpler in electrical structure, excellent in anti-interference property and good in testing repeatability; and the accuracy and the stability of partial discharge identification and location are reflected very well.

Description

technical field [0001] The invention belongs to the technical field of electric power, and in particular relates to a data measurement and storage system and method for realizing high-frequency and ultra-high-frequency partial discharge monitoring of transformers. Background technique [0002] Electrical equipment such as power transformers are affected by factors such as temperature, lightning strikes, overvoltage, and self-heating during long-term operation, and the insulation will gradually age. Partial discharge is an important reason for the deterioration of power transformer insulation. If it is too high, it will cause electrical discharge or breakdown in the insulating medium. This kind of discharge only exists in the partial position of the insulation, and will not immediately form the entire insulation penetration breakdown or flashover. If effective monitoring of partial discharge is not carried out in time, it will gradually expand and cause equipment insulation ...

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Problems solved by technology

[0005] Although the above-mentioned prior art uses different detection methods, because partial discharge is a very complex discharge phenomenon, it may include discharge on the tip or corner of a conductor in gas or liquid, surface discharge on the interface of different insulating materials or Slip flash discharge, bubble discharge in solid or liquid insulating materials, dendritic discharge in solid insulating materials, etc.

Therefore, the obvious disadvantages brought about by it are: first, the discharge characteristics of various partial discharges are not the same, and the sensitivity to each test method is also different. Simply using a partial discharge detection method may not be able to Accurate identification and positioning of partial discharge; second, even if the above-mentioned prior art is simply integrated into one device, it will directly lead to bulky, heavy and inconvenient portability of the device, complex interface, messy test wiring, and poor anti-interference performance. Moreover, the system's computing speed, capacity, stability and other requirements will also face challenges

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