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Excitation characteristic test system for current transformer

A technology for current transformers and excitation characteristics, which is applied in the direction of instruments, measuring electronics, measuring devices, etc., can solve the problems of inconvenient testing and difficulty in measuring the internal resistance of windings, etc., and achieve the effects of improving accuracy, reducing random errors, and measuring accurately

Inactive Publication Date: 2005-04-06
SHANGHAI JIAO TONG UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Therefore, an additional degaussing process is required in the measurement of excitation characteristics, which brings great inconvenience to the test
In addition, it is not easy to measure the internal resistance of the winding in the above devices, and additional tests are required

Method used

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  • Excitation characteristic test system for current transformer
  • Excitation characteristic test system for current transformer
  • Excitation characteristic test system for current transformer

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Embodiment Construction

[0018] like figure 1 As shown, the current transformer excitation characteristic test system includes: power supply system, measurement main circuit, data acquisition system, control subsystem, central processing system and peripheral general equipment. The power system consists of a full-bridge rectifier module, a filter capacitor and a start-up protection circuit. The two output terminals of the full-bridge rectifier module are connected to the start-up protection circuit, and the output of the start-up protection circuit is connected to the filter capacitor; the main circuit is measured by the damping resistance R D , parallel resistance Rp, parallel capacitance Cp, and the measured winding, the parallel resistance Rp, parallel capacitance Cp and the measured winding are connected in parallel, and on this basis, a damping resistance R is connected in series D ;The data acquisition system is composed of a current sensor, a voltage sensor, an isolation module, a temperature ...

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Abstract

It is a current transformer excitation test system in electric power test technique field, wherein the power system comprises bridge rectification module, filter capacitor and start protection circuit; the data collection system comprises current sensor, voltage sensor, isolation module, temperature sensor, temperature transducer and analog channel of data collection card; the control sub-system comprises digit output channel of data collection card, three solid relays, three electromagnetic relays, and three contactors; the central processor is connected with data collection system and control sub-system through data collection card.

Description

technical field [0001] The invention relates to a testing system for the excitation characteristics of a current transformer, in particular to a testing system for the excitation characteristics of a secondary winding of a power current transformer, which is used in the technical field of electric power testing. Background technique [0002] The excitation characteristic of the secondary winding of the current transformer is an important factor determining the performance of the transformer, so the measurement of the excitation characteristic of the secondary winding of the current transformer is essential in engineering practice. According to the national standard GB16847-1997 "Technical Requirements for Transient Characteristics of Current Transformers for Protection", there are many performance indicators for measuring the secondary winding of transformers. Among them, the more important parameters are the relationship between winding current and magnetic flux, winding vo...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01R31/06G01R35/02
Inventor 杨煜普达来李富根张毅君牛志勇
Owner SHANGHAI JIAO TONG UNIV
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