Low-voltage electric energy metering device utilizing optical fiber to transmit signal

Abstract

The invention discloses a low-voltage electric energy metering device utilizing optical fiber to transmit a signal. The device adopts the structure that a three-phase electric energy acquisition device is connected with an upper computer which displays electric energy parameters; the three-phase electric energy acquisition device comprises a metering chip acquisition module used for acquiring three-phase voltage and three-phase current and subjected to AD (Analog Digital) conversion; the signal is stored in a data storage module; the data is selectively output by an MCU (micro control unit) to an optical transmitting module through an SPI (Serial Peripheral Interface) bus; the optical transmitting module converts an electric pulse signal into an optical signal which is remotely transmitted to an optical receiving module through the optical fiber; the optical recovering module converts the weak optical pulse signal, which is attenuated and deformed after being transmitted by the optical fiber, into electric pulse signal through photoelectric conversion; and the electric pulse signal is returned to the standard digital pulse signal which is displayed by the upper computer. The device provided by the invention can reduce comprehensive errors in electric metering, improves metering accuracy and avoids electricity theft.

Description

technical field [0001] The invention relates to a low-voltage electric energy metering device. Background technique [0002] The traditional low-voltage metering device is composed of metering meter, secondary circuit wiring, joint junction box, and current transformer according to the prescribed wiring method, and the wiring method has not changed so far. It is only developed from the original electromagnetic induction watt-hour meter to the electronic watt-hour meter that is widely used now. However, the current transformer is still an analog signal transmitted to the electronic energy meter. With the development of electric power technology, this signal transmission method can no longer meet the development requirements of the intelligent grid. Signal digitization is the premise and inevitable trend of building a smart grid. At present, domestic intelligent substations have widely used optical fiber as a means of signal transmission, and the technology is relatively mat...

AI Technical Summary

Problems solved by technology

In the traditional low-voltage metering device, there are as many as 10 wires from the current transformer to the meter. Not only the wiring is cumbersome and error-prone, but also the limitation of the analog signal transmission method is relatively large, which greatly restricts the electric energy metering device. development of

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