Device and method for checking portable electronic current transformer

A technology for current transformers and calibration devices, which is applied to measuring devices, instruments, and measuring electrical variables, etc., can solve the problems of heavy weight, large volume, and high cost, so as to reduce calibration costs, improve calibration efficiency, and save energy. to costly effects

Active Publication Date: 2015-09-02
GUIZHOU POWER GRID CO LTD
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  • Abstract
  • Description
  • Claims
  • Application Information

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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 ca

Method used

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  • Device and method for checking portable electronic current transformer
  • Device and method for checking portable electronic current transformer
  • Device and method for checking portable electronic current transformer

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Embodiment Construction

[0024] The present invention will be described below in conjunction with the accompanying drawings.

[0025] The invention relates to a portable electronic current transformer calibration device, which is used for calibration of the electronic current transformer 2 to be tested. Its structure is as follows: figure 2 As shown, it includes voltage regulator, precision resistor, standard current transformer 1, high current cable, secondary converter, merging unit and data processing circuit. The series precision resistor is connected to the secondary side input terminal of the standard current transformer 1, the voltage at both ends of the precision resistor is led to the data processing circuit through the cable, the primary side output terminal of the standard current transformer 1 is connected to the high current cable, and the high current cable is also The electronic current transformer 2 to be tested is connected in series with the primary side input terminal of the electr...

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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...

Claims

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Application Information

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IPC IPC(8): G01R35/02
Inventor 徐长宝高吉普肖小兵鲁彩江刘东伟周炜梁冰李永兵
Owner GUIZHOU POWER GRID CO LTD
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