Multi-ratio current transformer intelligent control device

Abstract

The invention belongs to the field of high-voltage electric energy metering equipment, and specifically discloses an intelligent control device for a multi-ratio current transformer, including: a parameter module, a central processing module, a storage module, an input module, a display module, a current adjustment multiple module, and a current switching transformer. Compared with the module, it also includes a power module that provides working power for the intelligent control device. The central processing module is connected to each module, the secondary current of the multi-ratio current transformer is connected to the parameter module, the current adjustment multiple module, and the input terminal of the current switching ratio module, and the current adjustment multiple module, current switching transformer The output terminal of the ratio module is connected to the current input terminal of the metering ammeter. The present invention can output normal electrical signals to supply energy meters for metering when the current transformer is no-load, light-loaded or overloaded, so as to ensure the accuracy of the metering results, and further prevent the current transformer from burning out related metering equipment due to poor overload capacity. caused by power outages.

Description

technical field [0001] The invention belongs to the field of high-voltage electric energy metering equipment, and specifically discloses an intelligent control device for a multi-ratio current transformer. Background technique [0002] For a long time, high-voltage metering in power systems has been customizing the current ratio of the current transformer by calculating a single transformation ratio through the transformer capacity. The closer the total load current of the current transformer is to its rated value, the higher the measurement accuracy will be. When the load range is large, the change range of the total load current is also large. When the total load current is higher than 120% of the rated value (at this time, the current transformer is working in an overload state), the measurement accuracy will be significantly reduced due to magnetic saturation and other reasons. , when the overload capacity of some current transformers is poor, it may even burn out the re...

AI Technical Summary

Problems solved by technology

When the load range is large, the change range of the total load current is also large. When the total load current is higher than 120% of the rated value (at this time, the current transformer is working in an overload state), the measurement accuracy will be significantly reduced due to magnetic saturation and other reasons. , when the overload capacity of some current transformers is poor, it may even burn out the relevant metering equipment, which will lead to regional power outages; when the total load current is lower than 20% of the rated value of the current transformer (at this time the current transformer works In the light load state), due to the lower resolution and other reasons, the measurement error will also increase greatly, and even cannot be measured

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