Intelligent control device for multi-transformation ratio current transformer

Abstract

The invention belongs to the field of high-voltage electric energy metering equipment, and particularly discloses an intelligent control device for a multi-transformation ratio current transformer. The intelligent control device comprises a parameter module, a central processing module, a storage module, an input module, a display module, a current adjusting multiple module and a current switching transformation ratio module. The intelligent control device further comprises a power supply module providing a working power supply for the intelligent control device. The central processing module is connected with the other modules, secondary current of the multi-transformation ratio current transformer is connected to the input ends of the parameter module, the current adjusting multiple module and the current switching transformation ratio module, and the output ends of the current adjusting multiple module and the current switching transformation ratio module are connected to the input end of a metering ammeter. The intelligent control device disclosed by the invention can output normal electric signals so as to be metered by an electric energy meter under the condition that the current transformer is in a state of no-load, underload or overload, thereby ensuring a metering result to be accurate, and further being capable of preventing the current transformer from burning relevant metering equipment because of poor overload capacity resulting in a power failure accident.

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 r...

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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