On-site current transformer comprehensive detector and testing method thereof

A current transformer and comprehensive detection technology, applied in measuring devices, instruments, measuring electrical variables, etc., can solve the problems of difficult wiring and inaccurate verification of large current transformers, and achieve problems such as solving wiring difficulties, reducing weight and reducing volume. Effect

Active Publication Date: 2013-09-11
STATE GRID CORP OF CHINA +3
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] In order to solve the problem of difficult wiring of large current transformers...

Method used

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  • On-site current transformer comprehensive detector and testing method thereof
  • On-site current transformer comprehensive detector and testing method thereof
  • On-site current transformer comprehensive detector and testing method thereof

Examples

Experimental program
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Embodiment Construction

[0021] like Figure 1-2 As shown, an on-site current transformer comprehensive detection device includes a transformer calibrator 101 connected to the measured current transformer, a standard device 102 and a simulation load box 103, the standard device 102 and the secondary side of the measured transformer performing a comparison, and transmitting the obtained differential current signal and the standard secondary signal to the transformer calibrator 101;

[0022] The transformer calibrator 101 performs conditioning, data collection and data processing operations on the input signal of the device under test;

[0023] The dummy load box 103 provides a prescribed load to the device under test.

[0024] Connect the primary terminal L of the standard device 102 1 Connect the current transformer under test CT X P 1 , L 2 Connect to CT X the L 2 , S of the current transformer under test 1 , S 2 Connect the K of the transformer calibrator 101 1 、K 2 superior.

[0025] Th...

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PUM

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Abstract

The invention discloses an on-site current transformer comprehensive detector and a testing method thereof. The on-site current transformer comprehensive detector comprises a transformer calibrator, a standard instrument and an artificial load box which are connected with a to-be-tested current transformer. The standard instrument is compared with the secondary side of the to-be-tested current transformer and transmits differential current signals and standard secondary signals both acquired through comparison to the transformer calibrator. The transformer calibrator performs calibration, data collection and data processing calculation on input signals of a to-be-tested device. The artificial load box is used for providing specified loads to the to-be-tested device. Errors and related parameters of the to-be-tested current transformer are actually measured under low power frequency currents, errors under rated currents are extrapolated on the basis of a low current test, and then overall transformer performance indexes including magnetic saturation margin, volt-ampere characteristics, magnetic properties and security coefficients of the to-be-tested transformer are measured. The problems of difficulty in connecting of a high-current transformer and inability of accurate verification are solved, labor intensity of workers is lowered, and working efficiency is improved.

Description

technical field [0001] The invention relates to the field of electric power transmission, in particular to a device and a testing method for on-site testing of current transformers. Background technique [0002] At present, the detection of on-site current transformers generally uses the traditional comparative difference method to measure under full current. This detection method requires high-current power supply equipment, a standard current transformer with the same transformation ratio, a current load box, and a transformer calibrator. When measuring, the standard device and the current transformer under test are connected into a closed loop at one time, and the polarities are connected. The difference between the secondary current of the current transformer under test and the secondary current of the standard device is input into the transformer calibrator, and the differential current and secondary current are measured. The ratio of the phasors, that is, the error of...

Claims

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Application Information

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IPC IPC(8): G01R35/00
Inventor 黄葆文乔立凤高敬更赵屹涛闫宪峰徐和平陈欣杨春光吕志强王磊
Owner STATE GRID CORP OF CHINA
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