Traveling wave protection acquisition circuit

Abstract

The invention discloses a traveling wave protection acquisition circuit which comprises a current transformer, a precision operational amplifier follower circuit, a precision operational amplifier reverse proportional attenuator circuit, a single-end bipolar-to-unipolar differential circuit, a single-channel unipolar differential high-precision AD acquisition circuit, and is characterized in thatthe output end of the current transformer is connected with the positive input end of the precision operational amplifier follower circuit; the output end of the precision operational amplifier follower circuit is connected with the input end of the single-end bipolar-to-unipolar differential circuit; the output end of the single-end bipolar-to-unipolar differential circuit is connected with the input end of the single-channel unipolar differential high-precision AD acquisition circuit; and the output end of the precision operational amplifier reverse proportional attenuator circuit is connected with the single-end bipolar-to-unipolar differential circuit. The traveling wave protection acquisition circuit is high in driving load capacity, high in sampling precision, high in sampling rate and suitable for traveling wave protection acquisition, and has high practical value and wide application prospects.

Description

technical field [0001] The invention relates to the technical field of circuit design, in particular to a method for designing a traveling wave protection acquisition circuit. Background technique [0002] The high-voltage long-distance transmission line in the power system belongs to the distributed parameter circuit, and the electromagnetic energy during the state switching or disturbance of the power system will cause a wave process in it. Traveling wave is a transient component that propagates at approximately the speed of light. Even on a 1000km long line, its existence time does not exceed 5ms. Previous protection devices cannot accurately capture and analyze such signals, so they cannot be used in production practice. [0003] Scholars at home and abroad started research on protection and ranging based on traveling waves in the 1950s. The difficulties they encountered were: traveling waves only exist in a very short time window, and it is difficult to act as the main...

AI Technical Summary

Problems solved by technology

[0005] In order to solve the problems existing in the prior art, the present invention provides a traveling wave protection acquisition circuit, by setting a current transformer, a precision operational amplifier follower circuit, a precision operational amplifier reverse proportional attenuator circuit, a bipolar single-ended switch Unipolar differential circuit, single-channel unipolar differential high-precision AD acquisition, solves the technical problem that this signal cannot be accurately captured and analyzed, resulting in the inability to be used in production practice

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