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Calibration device of current transformer and method for calibrating current transformer by using same

A technology for current transformers and calibration devices, which can be used in measuring devices, instruments, measuring electrical variables, etc.

Inactive Publication Date: 2013-03-27
AIR FORCE UNIV PLA
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0010] In order to overcome the time-consuming and labor-intensive shortcomings of the existing current transformer calibration method due to the huge equipment, the present invention provides a current transformer calibration device

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  • Calibration device of current transformer and method for calibrating current transformer by using same
  • Calibration device of current transformer and method for calibrating current transformer by using same
  • Calibration device of current transformer and method for calibrating current transformer by using same

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Embodiment Construction

[0034] refer to figure 1. The current transformer calibration device of the present invention includes a sine wave frequency conversion test power supply, a single pole switch S, a voltage detection sensor SVT, a current detection sensor SCT1, a current detection sensor SCT2 and a voltage and current detection platform. Among them, the sine wave frequency conversion test power supply provides excitation power for the tested current transformer UCT, the voltage detection sensor SVT is responsible for detecting the primary side voltage of the tested transformer UCT, the current detection sensor SCT1 and the current detection sensor SCT2 respectively detect the tested transformer UCT Primary and secondary currents. The test power used in the present invention is a sine wave variable frequency test power, and a single-pole switch is installed on the secondary side of the transformer UCT to be tested.

[0035] Under the above conditions, the present invention proposes a current ...

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Abstract

The invention discloses a calibration device of a current transformer and a method for calibrating the current transformer by using the same, aiming at solving the technical problem that time and effort are wasted because of a huge device by using the traditional method for calibrating the current transformer. The technical scheme is as follows: by adopting a portable variable frequency sine-wave current output experimental power supply with small volume, the calibration of the accuracy of the detected current transformer is realized according to the on-site current transformer and a parasitic parameter of a return circuit thereof, the problems on the shortage of high-capacity inductance and capacitance for compensation of a high-power voltage regulator, a rising current implement and the return circuit thereof adopted in the traditional test method are avoided, and the purpose of saving time and effort is achieved.

Description

technical field [0001] The invention relates to a transformer calibration device, in particular to a current transformer calibration device. It also relates to a method for calibrating a current transformer by using the current transformer calibrating device. Background technique [0002] It is widely used in electromagnetic current transformers (Current Transformer, CT) above 750kV, and its accuracy requirement is 0.2. However, the strong electromagnetic interference of the transmission line, the installation position and installation method of the CT will all have an impact on its own accuracy. This makes the accuracy verification of the current transformer of the ultra-special power grid only on-site. [0003] refer to figure 2 , the document "The People's Republic of China National Metrology Verification Regulations National Standard JJG 313--94" discloses a current transformer calibration circuit. The circuit consists of a voltage regulator T1 and a current booster T...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01R35/02
Inventor 孙进曹建安张君
Owner AIR FORCE UNIV PLA