On-site calibration system and method for electronic current transformer

Abstract

The invention provides an electronic current transformer field calibration system and method. The system comprises a standard current transformer, a current increasing device, a calibration device anda single bus connecting wire connected to tested electronic current transformers, wherein according to the single bus connecting wire, three phases which are alternately adjacent to each other are each connected with one tested electronic current transformer, two alternately adjacent two-phase terminals (201) and (204) are connected to the current increasing device and the standard current transformer respectively, in the other two spaced phases, the terminals (202) and (203) are connected, and the terminals (205) and (206) are connected. The problem that the testing process is complex in existing intelligent substation electronic current transformer field calibration is solved, and the field calibration efficiency of the electronic current transformers is improved.

Description

technical field [0001] The invention relates to electric power technology, in particular to an on-site calibration system and method for an electronic current transformer. Background technique [0002] With the continuous development of key technologies in smart grids and smart substations, my country's smart substations are experiencing explosive growth, and the number of smart devices in smart substations is also increasing. For transformers in substations, on-site calibration is required before they are put into operation, and on-site calibration of electronic transformers from smart substations is more complicated than on-site calibration of electromagnetic transformers in traditional substations, and the It takes more time. The on-site verification of the transformer needs to be carried out in a power outage, and cross operations cannot be carried out during this period. Therefore, improving the efficiency of on-site calibration of electronic transformers in smart sub...

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Problems solved by technology

[0003] In the prior art, the electronic current transformer calibration wiring diagram given in the State Grid Enterprise Standard Q / GDW 690-2011 "On-site Calibration Specifications for Electronic Transformers" is as follows figure 1 shown, using figure 1 The transformer calibration scheme shown can only conduct on-site calibration for one electronic current transformer at a time. For each on-site calibration of one electronic current transformer, it is necessary to disconnect and connect the test line once, and also need to disconnect and connect Secondary test line, and at the same time move the test equipment and auxiliary equipment according to the position of the tested product

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