Protection device sampling unit based on Rogowski coil and LPCT combination

Abstract

The invention discloses a protection device sampling unit based on Rogowski coil and LPCT combination. The protection device sampling unit is composed of a Rogowski coil and LPCT combination current sensor input module, a signal conditioning circuit, an A / D conversion circuit, a CPU chip circuit, a post-processing circuit, a current output module, a power module and a communication module. The Rogowski coil and LPCT combined current sensor input module is connected with the signal conditioning circuit; the signal conditioning circuit is connected with the A / D conversion circuit; the A / D conversion circuit, the power supply module and the communication module are connected with the CPU chip circuit; the CPU chip circuit is connected with the post-processing circuit; and the post-processing circuit is connected with the current output module. The sampling requirement of 512 points / cyclic waves is met, the sampling accuracy reaches 0.1 level, no information packet loss exists in the circuit data processing and transmission process, information can be completely obtained, the digitalization and edge calculation functions of a protection device are met, and the defects that in the prior art, sampled and output signals are poor in precision, accuracy and stability are overcome.

Description

technical field [0001] The present application relates to the technical field of circuit design, in particular to a protection device sampling unit based on a combination of a Rogowski coil and LPCT. Background technique [0002] At present, a new round of scientific and technological revolution and industrial transformation is accelerating and promoting the vigorous development of the digital economy. The digital transformation of the world economy is the general trend. At present, traditional substations are gradually eliminated, and gradually develop towards digital and intelligent substations. As the key node and basic link of the smart grid, the digital substation has functions such as connecting lines, transmitting electric energy, changing voltage levels, and controlling electric energy flow. At the same time, the electronic transformer is used as the basic measurement equipment of the smart grid. However, the sampling frequency of electronic transformers, merging u...

AI Technical Summary

Problems solved by technology

However, the sampling frequency of electronic transformers, merging units and other equipment currently on the market is low, and fixed sampling is used in the sampling process without frequency tracking, which leads to insufficient signal precision, accuracy, and stability of the sensor sampling output

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