High-precision multi-transformation-ratio standard current transformer working for long time under 150% rated current

Abstract

The invention relates to a high-precision multi-transformation-ratio standard current transformer working for a long time under 150% rated current, and belongs to the technical field of electric energy metering. The transformer comprises a shell, a primary winding, a secondary winding, an air passage, an insulating film, an iron core, an error compensation unit, a power supply and control module, a man-machine interaction unit, a fan, a self-locking universal wheel and a wiring terminal strip. By applying heat dissipation measures, error compensation measures and the like, the measurement accuracy and stability of the standard current transformer working for one hour for a long time under the condition of 150% rated current are guaranteed, meanwhile, the measurement accuracy and stability under the condition of 1-120% rated current are met, the technical support is provided for overload and error tests of the current transformer, and management of work such as current transformer network access detection, arrival acceptance check, operation quality, production and manufacturing and the like can be enhanced.

Description

Technical field[0001]The present invention relates to a high-precision multi-altered ratio standard current transformer working at 150% rated current, belonging to the field of electricity metering.Background technique[0002]Current transformers are transformers for transmitting information signals to measuring instruments, meters, and protection or control devices or electrical appliances. Current transformers can convert large currents into small currents for measurement or protection systems. The measurement accuracy of the current transformer is related to the fairness, fairness of trade settlement, equipped, supply, and use between trade settlement, and its reliable operation is related to power grid power safety.[0003]Due to the technology of the production enterprise of 35kV and below, the barrier threshold is not high, the product demand is broad, leading to the current industry's overall industrial concentration, the number of manufacturers, the product quality is not good, ...

AI Technical Summary

Problems solved by technology

The standard current transformer is a precision instrument, the heat brought by long-term work will seriously affect its error characteristics, and even burn out the equipment

Due to the lack of standard current transformers that can operate at 150% of the rated current for a long time in many testing institutions, it is difficult or even impossible to carry out the overload test of current transformers effectively, which affects the evaluation and judgment of the quality of current transformers

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