All-fiber current transformer with quick establishment time and signal processing unit of all-fiber current transformer

Abstract

The invention belongs to the technical field of all-fiber current transformers, and particularly relates to an all-fiber current transformer with quick establishment time and a signal processing unitof the all-fiber current transformer. The signal processing unit comprises a main control module, an analog-to-digital conversion module, a first digital-to-analog conversion module, a second digital-to-analog conversion module, a first gain control module, a second gain control module and a selector switch; the main control module is connected with the first digital-to-analog conversion module through the first gain control module, is connected with the second analog-to-digital conversion module through the second gain control module, and is in control connection with the selector switch; oneend of the selector switch is used for being connected with a phase modulator in the all-fiber current transformer, and the other end of the selector switch is in switching connection with the firstdigital-to-analog conversion module and the second digital-to-analog conversion module. The all-fiber current transformer can reduce the edge switching time of a feedback modulation signal, i.e., thepositive and negative switching rise time of the modulation signal, increases a useful signal collection section, and improves the measurement frequency of the all-fiber current transformer.

Description

technical field [0001] The invention belongs to the technical field of all-fiber-optic current transformers, and in particular relates to an all-fiber-optic current transformer with fast settling time and a signal processing unit thereof. Background technique [0002] The sensitive part of the all-fiber current transformer adopts all-fiber devices, which has the advantages of good insulation, good anti-electromagnetic interference performance, large measurement range, wide response frequency range, measurable AC and DC, and convenient installation and maintenance. It is becoming the development trend of electronic current transformers. the trend of. [0003] like figure 1 As shown, the commonly used all-fiber current transformer consists of two parts, namely the signal processing unit and the optical path sensing unit. Among them, the circuit of the conventional all-fiber-optic current transformer based on the closed-loop control method of bias modulation is as follows: ...

AI Technical Summary

Problems solved by technology

[0007] The present invention provides an all-fiber-optic current transformer with fast settling time and its signal processing unit, which is used to solve the problem that the sampling frequency cannot be increased caused by the all-fiber-optic current transformer in the prior art

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