Local digitizer of analog mutual inductor

Abstract

The invention is concerned with the in-place digitization equipment of simulation quantity instrument transformer. It consists of: N transducer with small size, N signal collecting board and the power supply. The numeric area of N is the positive integer from 1 to 6; the connection of each part is: each inputting end of the small transducer connects with one outputting end of the traditional electromagnetism instrument transformer, each outputting end of the small transducer connects with the signal collecting board and forms the signal processing unit, N signal processing units connects with the power supply. The equipment solves the magnetic saturation problem of the traditional high voltage instrument transformer; the invention is with high accuracy in computation; convenient maintenance and operation; capability of working under long shift, stable and low cost.

Description

technical field The invention belongs to the technical field of electric power equipment, and in particular relates to the on-site digital transformation technology of traditional transformers. Background technique In the construction of substations, traditional electromagnetic transformers have been the mainstay for decades, divided into two types: current transformers and voltage transformers, GB1207 and GB1208. Its output current is 5A / 1A, voltage 100V / analog signal, which is directly transmitted to the secondary equipment such as relay protection in the control room through long-distance cables. The advantages of this type of transformer are: a large number of long-term operating experience; long life, the general design life is 30 years; except for high-voltage and ultra-high-voltage grades, the cost is low. Its disadvantages are: magnetic saturation phenomenon; SF6 and other non-environmentally friendly gases or liquids are used as insulating materials, and accident...

AI Technical Summary

Problems solved by technology

However, the primary converter of the existing electronic transformer works on the high-voltage side. For the active type, it has high requirements for the primary power supply. At present, the optical energy supply method of the laser is mainly used, and its life expectancy needs to be tested. Product reliability Experience is still accumulating, and it is in the experimental stage of product operation. In addition, the cost of laser power supply and photocells is very high, which increases the overall cost.

Images