Device and method for checking portable electronic current transformer

Abstract

The invention relates to a device and method for checking a portable electronic current transformer. The device includes a standard current transformer, a heavy current cable, a secondary converter, a merging unit, a voltage regulator, a precision resistor, and a data processing circuit. Voltage output by the voltage regulator is connected to a secondary side input terminal of the standard current transformer via series connection of the precision resistor; voltage at the two ends of the precision resistor are led into the data processing circuit via the cable; the primary side output terminal of the standard current transformer is connected to the heavy current cable; the heavy current cable is further in series connection with a to-be-measured electronic current transformer and is connected with the primary side input terminal of the to-be-measured electronic current transformer; the secondary side output terminal of the to-be-measured electronic current transformer is connected to the secondary converter and the merging unit in sequence; the merging unit outputs a to-be-measured current signal to the data processing circuit; and the data processing circuit outputs a checking result. The device has advantages, such as high checking precision, small size, light weight, portability, and low cost.

Description

technical field [0001] The invention relates to the technical field of power equipment calibration, in particular to a portable electronic current transformer calibration device and method. Background technique [0002] Current transformer (abbreviated as CT) is an important equipment for electric energy metering and relay protection in the power system. Its long-term stability, reliability and safety are closely related to the safe and stable operation of the power system. There are two main types of current transformers currently in use: one is electromagnetic current transformers, and the other is electronic current transformers. [0003] Traditional electromagnetic current transformers are based on the principle of electromagnetic induction and have been used for more than 100 years. However, they have some shortcomings and cannot meet the needs of the new generation of smart substation construction and development. (1) The insulation structure is complex, which needs t...

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Problems solved by technology

[0006] The present invention aims at the problems of large volume, heavy weight and high cost in the existing electronic current transformer calibration device using a large current generator, and provides a portable electronic current transformer calibration device, which saves the large current The generator can accurately and conveniently calibrate the electronic current transformer, and has the advantages of high calibration accuracy, small size, light weight, simple structure, and low cost.

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