Standard verification apparatus of high-voltage three-phase combined transformer

Abstract

The invention relates to a standard calibrating device of a high-voltage three-phase combined mutual inductor, which belongs to an electronic calibrating device used for the electric energy measurement and the current measurement. The electronic calibrating device comprises a single chip, an A / D converter, a front end circuit and a 380v three-phase power supply; three current risers and the three-phase power supply adopt the star connection and are connected with a compensation winding Ns of a compensation adjusting coil in parallel, a secondary winding of the compensation adjusting coil is connected with a primary winding of a standard current mutual inductor; three voltage risers and the three-phase power supply adopt the delta connection and are connected with a compensation winding Y of the compensation adjusting coil in parallel, the secondary winding of the compensation adjusting coil is connected with a primary winding of a standard voltage mutual inductor, and the secondary windings of the standard circuit mutual inductor and the standard voltage mutual inductor are all used for connecting the tested three-phase combined mutual inductor. The invention can simulate the actual operation status of the mutual inductor, carry out the calibration test under the actual operation status and correctly reflect the actual error and the relevant performance of the three-phase mutual inductor.

Description

technical field [0001] The invention relates to a standard device for measuring and verifying electric energy, in particular to the measuring and verifying device for electric energy measuring and verifying the measurement error performance and temperature rise performance of a high-voltage three-phase combined transformer in simulating its actual operation state. Background technique [0002] At present, three-phase combined transformers (metering boxes) with a voltage level of 35kV and below have been widely used, and most of this type of equipment is installed in large users and special stations for gateway metering, and its quality and performance are directly related to electric energy. The accuracy of measurement also affects the safe operation and production of the power sector, so it must be verified and tested to ensure its quality and measurement accuracy. The JB / T10432-2004 "Three-phase combined transformer" standard implemented by the relevant state departments o...

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Problems solved by technology

The JB / T10432-2004 "Three-phase combined transformer" standard implemented by the relevant state departments on August 1, 2004 clearly regulated the test method of the three-phase combined transformer, pointing out that the error test of the three-phase combined transformer, Both the temperature rise test and the mutual interference test should be carried out under the condition of applying three-phase voltage and three-phase current, but at present, there are no devices suitable for this project in various domestic testing institutions, and the product tests are all performed under single-phase power supply with single-phase standard The verification is carried out separately, and the manufacturer of the three-phase combination only uses the single-phase method to carry out the error verification and related tests of each phase (attached figure 1 ), both of which do not meet the requirements of the relevant current national standards. At the same time, the factory test and metrological verification do not meet the conditions of use of the product, thus causing detection errors, especially affecting the fairness and justice of energy trade settlement

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