Direct current protecting observe and control system

Abstract

The invention provides a DC protective measurement and control system which has characteristics in including six parts: a DC voltage-dividing unit, an isolation amplifier unit, a protective measurement and control unit, a communication management unit, a center processing unit installed with a maintenance analyse software and a communication medium. The system has advantages in that: 1) the system has better reliability, security, rapidity, sensitivity, easy maintenance and noise immunity; 2) sampling precision is up to 76uv / 1LSB, dynamic input range is 0-250mv, and the system has zero drift and gain automatic processing functions assort with hardware and software, ensures sampling data veracity of city rail transit power supply line under various load conditions; 3) the system can ensure high precision collecting and reliable transfering of power supply feeder current voltage amount, and has safe isolation distance with high-voltage line and micro-computer delay protective device; 4) the system has reliable protection and measurement control functions, realizes integration of protection, measurement and control; 5) crate has good full stopping property, and has high protection grade and strong noise immunity.

Description

(1) Technical field: [0001] The invention relates to a direct current protection measurement and control system applied in the field of urban rail transit, subway or light rail traction power supply. (two) background technology: [0002] According to the planning information provided by the National Development and Reform Commission and the Light Rail Research Center, China will have more than 550 kilometers of subway lines in 2020, and 2,000 kilometers of light rail and subway lines in 2050. But so far, the protection and control systems of the DC system of my country's rail transit still use imported equipment, and the domestic related industries are still blank in this field. The DC protection measurement and control device is the key equipment for relay protection in urban rail transit applications. The difficulty lies in directly collecting weak signals on high-voltage lines. It is necessary to ensure the collection accuracy of weak electrical signals (<=76uv) and en...

AI Technical Summary

Problems solved by technology

At present, the technical equipment of Germany's Siemens and Switzerland's Sécheron is mainly used in the Chinese market, but due to the monopoly of foreign technology, the price of the equipment is too high, and due to the differences in the application environment and operation mode at home and abroad, the current sampling zero drift exceeds the standard and Problems such as the lack of equipment maintenance methods have not been effectively resolved, and the localization of equipment can solve these problems

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