An optical signal linear transmission system and an active electronic current transformer

Abstract

The invention discloses an optical signal linear transmission system and an active electronic current transformer, and belongs to the technical field of electric power measurement. The optical signal linear transmission system includes hybrid electric signals to be transmitted and is characterized by comprising a signal judgment driving module; a controllable constant current driving module; and an optical signal monitoring transmission module; the input end of the signal judgment driving module is connected with the hybrid electric signals and feedback signals at the same time, and the signal judgment driving module is used for judging a linear relationship between the hybrid electric signals and the feedback signals; the input end of the controllable constant current driving module is connected with the output end of the signal judgment driving module and is used for outputting different driving signals; and input end of the optical signal monitoring transmission module is connected with the output end of the controllable constant current driving module and is used for generating the feedback signals and optical transmission signals which correspond to the hybrid electric signals. Through the optical signal linear transmission system and the active electronic current transformer, a linear relationship between the optical power of the signals to be transmitted and the optical power of the corresponding optical transmission signals is realized, and high-precision optical transmission of analog electric signals from a high-voltage side to a low-voltage side is accordingly realized by utilizing an analog mode.

Description

technical field [0001] An optical signal linear transmission system and an active electronic current transformer belong to the technical field of power measurement. Background technique [0002] Because optical fiber has the advantages of good insulation performance, wide frequency band, and anti-interference, in the field of power measurement, the high-voltage side environment where the electrical quantity to be measured (such as voltage and current) is located and the low-voltage side (such as the secondary of the current transformer) are realized through the optical fiber. Secondary side, instrument side in high voltage measurement) isolation is a simple and easy method. In the prior art, there are mainly two methods to realize the transmission of electrical quantity from the high-voltage side to the low-voltage side through optical fibers: digital mode and analog mode. [0003] The specific implementation of the digital method is: after the measurement of the electrical...

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Problems solved by technology

[0004] (1) While transmitting useful data on the high-voltage and low-voltage sides, it is necessary to choose a synchronous transmission method (such as adding an optical fiber dedicated to transmitting the clock) or an asynchronous transmission method (such as adding a time stamp for each data), regardless of choosing simultaneous Transmission mode or asynchronous transmission mode will greatly increase the complexity of the system

[0005] (2) The sampling frequency of the high-voltage side during digitization is usually not set too high. For example, the A / D sampling frequency of the electronic current transformer in the bus energy supply mode is too high, which will cause excessive power consumption of the system and cause power supply difficulties.

In the prior art, when the LD emits light, there are two light output surfaces. In addition to the normal front light output, the back can also receive a certain intensity of light. Using this feature, there are devices on the market that can monitor the power of the LD. LD, because the luminous power of LD is seriously affected by temperature, the main application of this technology design is to realize constant temperature control of LD by monitoring the luminous change of LD, but it is very difficult for this kind of LD to be used for amplitude modulation control, including The reason why LD luminescence is sensitive to temperature will lead to poor accuracy when used. More importantly, when LD is used for modulation, its dynamic range is too small, so at present, LD is more suitable for use in single-mode fiber to achieve large-capacity communication in digital mode. occasions other than AM control applications

[0010] The light-emitting mechanism of LED is different from that of LD. When it emits light, it can only emit light in one direction at a larger radiation angle. Therefore, it is still impossible to monitor the luminous power of LED in the prior art, so no matter whether it is directly controlled or indirectly controlled. Unable to achieve the desired linear relationship between the control electrical signal and the luminous power of the LED

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