An in-situ transformer protection anti-interference method based on sampling disturbance filtering

Abstract

The invention discloses an in-situ transformer protection anti-interference method based on sampling disturbance filtering. The method is characterized by adopting the high-speed sampling at least four times of the protection actual sampling rate to obtain analog quantity information; carrying out sampling disturbance filtering on sampling values obtained after analog-to-digital conversion, carrying out the abnormal waveform recognition through the change of the sampling slope, carrying out the data synchronization on the sampling disturbance filtering and data received by the HSR ring network, and after data synchronization, sending the data to a local sub-machine protection algorithm to be used, and meanwhile sending the data to other sub-machines through the HSR ring network. The methodis high in response speed and high in adaptability, the anti-interference algorithm is directly in a sampling value processing link and has no relation with HSR ring network data and the protection algorithm, and the in-situ transformer protection algorithm is not affected.

Description

technical field [0001] The invention relates to an anti-jamming method for in-situ transformer protection based on sampling disturbance filtering, and belongs to the technical field of relay protection. Background technique [0002] The new technology of local protection characterized by "digital sampling, local protection, private network for component protection, and information sharing" is the main technical direction of the smart substation of the State Grid Corporation of China in the future. The development of low-power chip integration technology, optical fiber communication technology, and breakthroughs in key technologies such as device electromagnetic compatibility, high protection, and thermal design provide a technical basis for the implementation of in-situ protection schemes. In-situ protection is arranged close to the primary equipment, adopts cable sampling and direct cable tripping, reduces cable length and intermediate links, and improves the quickness and ...

AI Technical Summary

Problems solved by technology

The protection sub-machine is arranged close to the primary equipment, which is easily affected by the operation of the primary equipment and the interference of the ground network, which makes the sampling data disturbed. The sampling data should not only be used for the protection of the sub-machine, but also for other sub-machines through communication. If the algorithm is not processed, the abnormal sampling data under the interference condition will easily lead to the misoperation of the transformer protection multi-submachine

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