Zinc oxide field suppression resistance assembly safety assessment method

A technology of demagnetization resistance and zinc oxide, which is applied in the direction of measuring electricity, measuring electric variables, instruments, etc., can solve the problems of difficulty in safety evaluation and judgment of zinc oxide demagnetizing resistance.

Active Publication Date: 2014-12-24
STATE GRID CORP OF CHINA +1
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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,

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  • Zinc oxide field suppression resistance assembly safety assessment method
  • Zinc oxide field suppression resistance assembly safety assessment method
  • Zinc oxide field suppression resistance assembly safety assessment method

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Embodiment Construction

[0045] The present invention will be further described below in conjunction with the drawings and specific implementations of the specification.

[0046] A 55MW hydro-generator unit adopts a parallel connection of 12 zinc oxide non-linear demagnetization resistance components. A single component adopts the wiring mode of 2 series 2 parallel 4 zinc oxide resistance valve discs. The rated working energy capacity of the components given by the manufacturer is 60kJ, the ultimate working energy capacity is 80kJ, the designed demagnetization voltage is 800V, and the nonlinear coefficient is 0.04.

[0047] 1. On-site testing of the varistor voltage of a complete set of zinc oxide demagnetization resistance components

[0048] The zinc oxide non-linear resistance tester is used to disconnect the serial fuse of the zinc oxide demagnetization component and connect the single component to the test system. Since zinc oxide resistors are composed of 2 parallel and 2 series wiring, the output cu...

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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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Application Information

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IPC IPC(8): G01R31/00
Inventor 吴跨宇卢岑岑陆海清黄晓明陆承宇楼伯良陈新琪卢嘉华熊鸿韬沈轶君卓谷颖
Owner STATE GRID CORP OF CHINA
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