A method and device for on-line group calibration of voltage transformers
A technology of voltage transformers and calibration methods, which is applied in the direction of measuring devices, instruments, and measuring electricity, can solve problems such as crisis grid safety operation, grid fluctuations, and damaged equipment, and achieve the effect of promoting the direction of online optimization decision-making.
Active Publication Date: 2019-03-22
STATE GRID CORP OF CHINA +2
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Problems solved by technology
The switching technology of high-accuracy standard devices has always been a difficulty in the online error calibration technology of transformers. Switching new equipment to live substations in operation will cause fluctuations in the power grid, and in severe cases, it will damage the equipment in operation in the substation and endanger the security of the power grid. run
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[0041] Embodiments of the present invention are described in detail below, examples of which are shown in the drawings, wherein the same or similar reference numerals designate the same or similar elements or elements having the same or similar functions throughout. The embodiments described below by referring to the figures are exemplary and are intended to explain the present invention and should not be construed as limiting the present invention.
[0042] 1. The online group calibration method of a voltage transformer provided by the present invention adopts multiple measurement methods, firstly, the repeatability of the data is judged, and the Dixon criterion is used for the data abnormal value of the voltage transformer whose repeatability meets the requirements. Judgment, in which before the error test, it is necessary to actually measure the secondary load of each tested voltage transformer, correct the error measurement data according to the actual load situation, and u...
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The invention provides a voltage transformer on-line group calibration method and apparatus. The method includes the following steps: 1. acquiring output data of the voltage transformer; 2. computing error measuring data of the voltage transformer; 3. correcting the error measuring data; and 4. determining an abnormal value of the error measuring data. The apparatus includes an A / D converting circuit, a merging unit and a data processing unit. The A / D converting circuit is connected to the voltage transformer. One input end of the data processing unit is connected to the merging unit through a data acquisition unit, and the other input end is connected to a synchronous clock unit through a synchronous signal acquisition unit. The synchronous clock unit is connected to the merging unit. The number of the data acquisition unit is 1. Compared with prior art, the voltage transformer on-line group calibration method and apparatus of the invention realize all station error on-line calibration within a short time provided that no standard is added.
Description
technical field [0001] The invention relates to a voltage transformer calibration method, in particular to an online group calibration method and device for a voltage transformer. Background technique [0002] One-time equipment condition maintenance of power system can reduce operating cost and equipment failure rate, which is an inevitable trend of power grid development. The number of transformers is huge, and the off-line error detection is not only a huge workload, but also the real error data of the transformers in operation cannot be obtained. Beginning in 1998, several large electrical companies in the United States and Western Europe began to commercialize substation on-line calibration and condition-based maintenance systems. In 2007, Italy carried out an attempt to calibrate voltage transformers and current transformers on-line at two 420kV stations. In 2012, China Electric Power Research Institute and Hubei Company cooperated to complete the research on voltage...
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IPC IPC(8): G01R35/02G01R31/00
Inventor 王欢王晓琪项琼吴士普余春雨汪本进杜砚岳长喜刘浩赵威杨洪朱凯陈泽远彭淑华王雪徐晨
Owner STATE GRID CORP OF CHINA