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On-line calibration and checking method for current inductor transformation ratio and angle difference

A technology for current transformers and calibration methods, which is applied in the direction of measuring electrical variables, instruments, and measuring devices, and can solve problems such as inability to drift calibration and calibration, and inability to obtain high-precision, stable and reliable measurement results, etc., to achieve easy access , Realize the effects of online calibration and verification, high accuracy and high reliability

Inactive Publication Date: 2007-10-24
INST OF SEMICONDUCTORS - CHINESE ACAD OF SCI
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Problems solved by technology

The existing current measurement methods cannot effectively calibrate and verify these drifts, especially in the online operating environment. Therefore, most of the existing insulation on-line monitoring products in actual operation make such as insulation Dielectric loss tanδ measurement, etc., cannot obtain high-precision, stable and reliable measurement results

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  • On-line calibration and checking method for current inductor transformation ratio and angle difference

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Embodiment Construction

[0022] Figure 1 is a schematic structural diagram of the insulation on-line monitoring system of the present invention. The monitoring working method of the insulation on-line monitoring system, the CPU calculation unit controls the measurement current I s (t) generation, I s (t) and I x (t) pass through the current transformer together to get the mixed current I g (t), I g (t)=a 1 I x (t)+a 2 I S (t), the I g (t) and I s (t) sent to the channel 1 and channel 2 of the data acquisition system at the same time, and sent to the CPU calculation unit after digitization for independent element analysis and signal separation, and I can be obtained s (t) estimated signal I s '(t). The mixing coefficient a calculated from 1 , a 2 It is convenient to calculate and obtain the current transformer characteristic coefficients such as the transformation ratio and angle difference of the current transformer in the actual working environment, and accurately determine and measure t...

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Abstract

The invention relates to a high-accuracy measurement technical field of current amplitude and phase, in particular to an online mark and check method for the transformation ratio and angle difference of current transformer CT, and a relative system, wherein lg(t) is the sensitive output of the current transformer with linearly mixed lx(t) and lx(t), therefore, Ig(t)=1Ix(t)+a2IS(t), while lx(t) is the object current, ls(t) is the current signal generated on the measurer, a1 and a2 are the sensitive factors of lx(t) and ls(t) on the output signal lg(t) of the current transformer, then the invention uses independent element analysis method to separate signal ls(t) from signal lg(t), to obtainthe evaluated signal ls'(t) of ls(t), and via the mixed factors a1 and a2 to obtain the transformation ratio and angle difference or the like of current transformer in real condition. Via comparing ls'(t) and ls(t), the invention can easily and reliably realize online check of current transformer and check the result of the independent element analysis.

Description

technical field [0001] The invention relates to the technical field of high-precision measurement of current amplitude and phase, in particular to a high-precision measurement of current in a power system, an online calibration and verification method and system for the transformation ratio and angle difference of a current transformer. Background technique [0002] In the insulation monitoring of power system equipment or system fault protection, as well as in electronic circuits and automatic control systems, it is necessary to measure the amplitude, frequency and phase of current with high precision. To measure the insulation dielectric loss tanδ of power equipment, it is necessary to develop a high-precision current transformer CT (CurrentTransformer). When the current passes through the core-through current transformer, it is hoped that an output signal with a phase difference of zero or a constant phase difference (angular difference) will be induced at the output end ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01R35/02G01R35/00
Inventor 鲁华祥李宁马晓燕陈天翔李彪
Owner INST OF SEMICONDUCTORS - CHINESE ACAD OF SCI
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