Analog signal separating and transferring system used for high voltage measuring

Abstract

The invention relates to an analogue-signal isolated transmission system for measuring high voltage, and pertains to the technical field of high voltage measurement. The system comprises: a laser light source for generating a linear polarization light beam; a signal modulator for coupling the linear polarization light beam with the signal modulator through a polarization-retaining optic fiber; a photoelectric converter for converting the optic power signals got after modulation by the signal modulator into voltage signals, which is connected with the signal modulator through a single-mode optic fiber; an electric signal detector for detecting the voltage signals output by the photoelectric converter, which is connected with the photoelectric converter through a radio-frequency cable. The invention can meet the isolated transmission of analogue and digital signals; the whole transmission system is an inactive system, with a wide application range; uses optic signals to communicate, which effectively avoids any disturbance in transmission, and is applicable for measuring hi-voltage area; the signal modulator in the system is of rapid response speed, high sensibility, and has improved the measuring frequency range and response speed.

Description

technical field [0001] The invention relates to an analog signal isolation transmission system for high-voltage measurement, which is suitable for occasions where the electromagnetic environment is harsh and signals need to be isolated and transmitted, and belongs to the technical field of high-voltage measurement. Background technique [0002] Compared with ordinary signal acquisition and measurement, high-voltage measurement has more difficulties. These difficulties are mainly manifested in: the measurement point is often in a high-voltage or strong electric field area, and the electromagnetic interference is strong; the voltage to be measured often has transient and transient characteristics. Features: The amplitude of the voltage to be measured is large. Therefore, the corresponding signal transmission system should meet the following requirements: because of strong electromagnetic interference, the transmission system requires good anti-electromagnetic interference capa...

AI Technical Summary

Problems solved by technology

However, since the system is built with discrete optical devices, it inevitably has the following disadvantages: due to the combination of optical devices, it is not only bulky, but also the mobility of the whole device is very poor; because the optical system requires a very high Therefore, the system debugging is complicated, and the characteristics of the whole system will change if the optical path changes slightly, and the stability of the system is poor.

This shortcoming greatly limits the application and development of the system.

[0006] To sum up, the existing signal isolation transmission system cannot fully meet the requirements of high voltage measurement

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