Online calibration system for electronic voltage transformer

Abstract

The invention relates to an online calibration system for an electronic voltage transformer. The online calibration system comprises a standard channel voltage transformer on a high-voltage side, a receiving end on a low-voltage side and an upper computer. The online calibration system is characterized in that the receiving end on the low-voltage side is connected with the upper computer through a serial connecting line, the receiving end on the low-voltage side is connected with the standard voltage transformer wiring terminal of the standard channel voltage transformer on the high-voltage side through a signal transmission line and a grading ring of the standard channel voltage transformer on the high-voltage side is automatically overlapped with a primary bus bar through an automatic lifting device. By controlling the automatic lifting of the lifting device which is fixed on the standard voltage transformer through a remote controller, the automatic overlapping of the grading ring of the standard voltage transformer and the primary bus bar is realized, the controllability and the personal safety during field operation are guaranteed, the online calibration of the high-precision electronic voltage transformer is realized and the difficulty of field operation is greatly reduced.

Description

technical field [0001] The invention relates to an electronic voltage transformer online verification system based on the standard voltage transformer automatic lifting, which is used for continuously power-on online verification of the electronic voltage transformer running in the power grid. Background technique [0002] Transformers play an important role in providing signals for subsequent metering, protection and monitoring equipment in substations, and the stability of their operation is particularly important. There are fundamental differences between electronic transformers and traditional transformers, so the calibration methods and equipment of traditional transformers cannot be used. Moreover, due to the relatively simple structure and relatively mature technology of traditional transformers, the method of regular power outage maintenance and calibration is generally adopted, and the period may be 10 years or even longer. However, electronic transformers use a la...

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Problems solved by technology

Because it is a live operation, under the premise that the operation process and results are uncontrollable, personal safety cannot be effectively guaranteed, so that the operation process can only be completed by personnel with live operation qualifications, and the transfor

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