Alternating current sampling circuit of transformer area intelligent fusion terminal

Abstract

The invention relates to the technical field of electronic measurement, in particular to an alternating current sampling circuit of a transformer area intelligent fusion terminal. Comprising a voltage signal step-down circuit, a current signal acquisition circuit, a metering chip, a communication electrical isolation circuit, an active pulse output isolation circuit and a reactive pulse output isolation circuit, the voltage signal step-down circuit converts a strong current voltage signal into a weak current voltage signal, and the current signal acquisition circuit converts a strong current current signal into a weak current current signal. The metering chip is used for converting a weak current voltage signal and a weak current signal into a digital sampling signal, an active pulse signal and a reactive pulse signal respectively, the communication electrical isolation circuit outputs the digital sampling signal, the active pulse output isolation circuit outputs the active pulse signal, and the reactive pulse output isolation circuit outputs the reactive pulse signal. Through the above structure, the sampling precision is improved, and stable operation can be realized by using a standby power supply after power failure.

Description

technical field [0001] The invention relates to the technical field of electronic measurement, in particular to an AC sampling circuit of an intelligent fusion terminal in a station area. Background technique [0002] The intelligent fusion terminal in the station area is a combination of the distribution transformer terminal and the concentrator, which solves the problems of non-sharing of data, duplication of functions, and increase in the amount of operation and maintenance. The terminal is composed of a power supply module, an AC acquisition module, a control module, an encryption module, and a communication module, etc., and realizes the monitoring of the total meter of the distribution station area, the monitoring of the residual current action protector, the status monitoring, remote meter reading, and the abnormal alarm of power consumption information , load management and other functions. [0003] However, at present, the fusion terminal has the problems of low AC...

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Problems solved by technology

[0004] The purpose of the present invention is to provide an AC sampling circuit for an intelligent fusion terminal in a station area, aiming to solve the technical problems of low AC sampling accuracy of a fusion terminal in the prior art, and data loss due to insufficient power supply after power failure

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