Method and system for online detection of voltage transformer precision

Abstract

The invention discloses a method and a system for online detection of voltage transformer precision. The invention is characterized in that the system comprises a capacitive voltage dividing loop, a signal acquisition processor and a data processing system, the output end of the capacitive voltage dividing loop is connected with the input end of a first signal acquisition processor, the output end of the voltage transformer to be detected is connected with the input end of a second signal acquisition device, the output end of the first signal acquisition processor and the output end of a second signal acquisition processor are connected with the data processing system, voltage signal on a power transmission line and voltage signal of the voltage transformer to be detected are acquired, calculated and processed respectively by the signal acquisition processing system of the power transmission line and the signal acquisition processing system of the voltage transformer to be detected, and the error condition of the voltage transformer to be detected is obtained. Tens of hours of uninterrupted measurement can be conducted to the voltage transformer to be detected under the charged operation condition and no influence is caused to the grid during accessing and quitting, so the assessment of the voltage transformer under different operation conditions and environmental characteristics can be realized and the online evaluation of the voltage transformer precision is flexibly realized.

Description

technical field [0001] The invention relates to an accuracy measurement technology of a high-voltage voltage transformer, in particular to an online accuracy detection method and system of a voltage transformer. Background technique [0002] At present, with the development of my country's power grid industry, especially the separation of power generation and transmission implemented by the reform of the power industry system, the accuracy, fairness and impartiality of electric energy measurement have attracted more and more attention from all parties. According to the relevant verification regulations of transformers, at present, the verification of the entire metering system of the power grid is carried out by sub-components, that is, the ratio difference and angle difference of the voltage transformer are verified separately, and the secondary voltage drop of the voltage transformer is independently verified. Among them, the voltage transformer The on-site verification of...

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Problems solved by technology

With the development of the power grid and the increase in the demand for electric energy on the load side, short-term power outages may also cause very huge losses

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