Zinc oxide field suppression resistance assembly safety assessment method

Abstract

The invention discloses a zinc oxide field suppression resistance assembly safety assessment method. As an accurate and unified assessment and calculation method based on zinc oxide field suppression resistance site testing data does not exist at present, after the data are measured, the characteristic change degrees and the variation trends of assemblies can only be roughly seen. According to the zinc oxide field suppression resistance assembly safety assessment method, a newly-defined zinc oxide field suppression resistance breakdown voltage safety critical index K is deduced for serving as a judgment basis, the safety critical index is converted into a corresponding safety critical value Kact through the adoption of the maximum assembly field suppression energy and the maximum assembly allowing energy, after the breakdown voltage of the assemblies is obtained through site measurement, only the ratio of the minimum actual measurement assembly breakdown voltage to the average other-assembly breakdown voltage needs to the calculated, and then the ratio is compared with the safety critical value to be capable of obtaining an assembly safety assessment conclusion. By means of the zinc oxide field suppression resistance assembly safety assessment method, the aims of assembly safety calculation and assembly safety assessment after zinc oxide field suppression resistance site measurement are achieved, and the accuracy of the safety calculation and assessment conclusion is improved.

Description

Technical field [0001] The invention relates to the field of field measurement, simulation calculation and safety evaluation of the zinc oxide nonlinear demagnetization resistance used in the demagnetization system of a generator, in particular to a configuration method based on the volt-ampere characteristics of zinc oxide components and the demagnetization resistance of the unit Derive the defined zinc oxide component varistor voltage safety critical index and convert it into the varistor voltage safety critical value, and based on the measured varistor voltage data of the zinc oxide component on-site, the ratio of the minimum varistor voltage value to the average varistor voltage of other components Compare the safety assessment method with the safety threshold to obtain the safety conclusion. Background technique [0002] The generator de-excitation system is the last line of defense in the failure process of the generator-transformer unit. Only the rapid and reliable de-exci...

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Problems solved by technology

[0005] The technical problem to be solved by the present invention is to overcome the above-mentioned defects in the prior art, and provide a method for accurately judging the safety of the zinc oxide demagnetization resistor assembly based on the maximum demagnetization energy of the unit and the measured component varistor voltage, so as to solve the current power generation problem. The complete set of zinc oxide non-linear demagnetization resistors for the unit is difficult to evaluate and judge the operation safety of the complete set of zinc oxide non-linear demagnetization resistors after the varistor voltage of individual components changes significantly

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