Method and device for comparing running errors of optical current transformer and electromagnetic current transformer in real time

Abstract

The invention discloses a method and a device for comparing running errors of an optical current transformer and an electromagnetic current transformer in real time, which are suitable for an intelligent substation provided with the optical current transformer and the electromagnetic current transformer at the same time. The field running error of the optical current transformer is subjected to data storage and remote analysis by utilizing a real-time ratio of field running errors, so that a data basis is provided for analysis of the running error of the optical current transformer; and the field running error of the optical current transformer is monitored in real time, so that the accuracy and the reliability of electric energy metering of the intelligent substation are guaranteed. Therefore, a good application prospect is achieved.

Description

technical field [0001] The invention relates to a method and device for real-time comparison of on-site operation errors for verifying the accuracy of optical and electromagnetic current transformers, and belongs to the technical field of electric energy measurement. Background technique [0002] At present, with the rapid development of the power grid, the State Grid Corporation of China has carried out the construction of intelligent substations in many provinces, and widely promoted the use of optical current transformers. Optical current transformers are passive current transformers, and the signal light source uses optical fibers from The ground is sent to the primary sensitive ring, which has the advantages of high potential part without electronic circuit, large dynamic range (10A-63kA), wide frequency response range (can measure both AC and DC currents at the same time), but the optical current transformer is affected by the external The influence of factors such as ...

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Problems solved by technology

[0002] At present, with the rapid development of the power grid, the State Grid Corporation of China has carried out the construction of intelligent substations in many provinces, and widely promoted the use of optical current transformers. Optical current transformers are passive current transformers, and the signal light source uses optical fibers from The ground is sent to the primary sensitive ring, which has the advantages of high potential part without electronic circuit, large dynamic range (10A-63kA), wide frequency response range (can measure both AC and DC currents at the same time), but the optical current transformer is affected by the external The influence of factors such as temperature and vibration is more obvious, and the error will produce obvious drift. At present, the detection of optical current transformers at home and abroad is still in the error detection before leaving the factory and putting into operation. Generally, the on-site current transformer calibrator is used. It belongs to offline test equipment, does not have the ability to run on the network for a long time, does not have large-capacity data storage and data interaction capabilities, and cannot track the changes of errors with external temperature, vibration and other factors in real time, thus lacking the long-term operation process of optical current transformers Experience in real-time detection, lack of real-time monitoring of optical current transformer errors, real-time tracking of errors, methods and devices for analysis of optical current transformer error characteristics, resulting in the accuracy and reliability of electric energy measurement in intelligent substations reduction of

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