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

A technology of standard current and rated current, applied in the direction of transformer/inductor cooling, electrical component structure association, etc., can solve the problem that the current transformer overload test is difficult to carry out effectively, affects the evaluation and judgment of the quality of the current transformer, and affects the error characteristics and other issues to achieve the effect of high accuracy, small size and improved safety

Active Publication Date: 2021-04-30
YUNNAN POWER GRID
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  • Abstract
  • Description
  • Claims
  • Application Information

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

Method used

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

Examples

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Embodiment 1

[0027]Example 1: Such asFigure 1-2As shown, a high-precision multi-altered ratio standard current transformer, including housing, primary winding, secondary winding, airway, insulating film, core, error compensation unit, power supply and Control module, fan, self-locking universal wheel, wiring terminal block;

[0028]The primary winding, a secondary winding, a airway, an insulating film, a core, an error compensation unit, a power supply, and a control module are located inside the housing; self-locking universal wheel is located at the bottom of the housing; the terminal block is ranked Above the housing, the human machine interaction unit is embedded above the housing;

[0029]The core of the standard current transformer is a ring structure; the primary winding L1-L2 and the secondary windings K1 to Km are uniformly wound on the core; between the secondary winding layers, the primary winding layer and the one winding and the second There is a rhombic insulating film insulation between...

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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, ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01F27/08H01F27/40
CPCH01F27/08H01F27/40
Inventor 林聪赵静程富勇何兆磊刘清蝉孙黎敏李腾斌孙军贾芳艳
Owner YUNNAN POWER GRID
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