CN106501747A - A kind of data processing method of current transformer excitation property test - Google Patents

A kind of data processing method of current transformer excitation property test Download PDF

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Publication number
CN106501747A
CN106501747A CN201610839803.5A CN201610839803A CN106501747A CN 106501747 A CN106501747 A CN 106501747A CN 201610839803 A CN201610839803 A CN 201610839803A CN 106501747 A CN106501747 A CN 106501747A
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China
Prior art keywords
current transformer
current
excitation property
phase
excitation
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CN201610839803.5A
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CN106501747B (en
Inventor
冯军基
王楠
王伟
王永宁
马小光
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State Grid Corp of China SGCC
State Grid Tianjin Electric Power Co Ltd
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State Grid Corp of China SGCC
State Grid Tianjin Electric Power Co Ltd
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    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
    • G01R35/00—Testing or calibrating of apparatus covered by the other groups of this subclass
    • G01R35/02—Testing or calibrating of apparatus covered by the other groups of this subclass of auxiliary devices, e.g. of instrument transformers according to prescribed transformation ratio, phase angle, or wattage rating

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  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Testing Of Short-Circuits, Discontinuities, Leakage, Or Incorrect Line Connections (AREA)

Abstract

The present invention relates to a kind of data processing method of current transformer excitation property test, its technical characteristics is comprised the following steps：The test of current transformer winding excitation property is carried out, current transformer excitation property measured data is obtained；Current transformer excitation property measured data is parsed, voltage x current measured value is extracted；Interpolation current point is chosen on unequal interval ground, enters row interpolation to three-phase data with identical electric current array and obtains three phase excitation characteristic curve；Three phase excitation characteristic curve is analyzed and exports analysis result；Judge whether current transformer excitation property is qualified according to analysis result.Excitation property test data of the present invention by analysis current transformer, realize generating with interval three phase excitation characteristic curve, and quick, effective, convenient, reliable calculating can be carried out to the excitation property of current transformer, analysis and the computational problem of current transformer excitation property is solved, effectively ancillary test personnel data-handling efficiency and the accuracy that current transformer excitation property is tested can be improved.

Description

A kind of data processing method of current transformer excitation property test
Technical field
The invention belongs at current transformer technical field, especially a kind of data of current transformer excitation property test Reason method.
Background technology
The excitation property test of current transformer is the most frequently used, maximally effective side of detection protective current transformer, performance Method.The combination misalignment that measurement current transform er is capable of by exciting characteristic curve, estimation P levels, the accurate limit of TPY level transformers Whether coefficient, estimation transient protection meet requirement with the symmetrical short-circuit electric current multiple or transient dimension factor of TP level transformers.This Outward, excitation property test can also the Safety factor of confirmatory measurement Current Transformer whether meet requirement.At present, generally adopt The test data of current transformer is analyzed with manual type, operating efficiency is low, it is difficult to which the different curves of three-phase are entered The comparing calculation that row quantifies, directly affects the judgement of testing crew.
Content of the invention
It is an object of the invention to overcoming the deficiencies in the prior art, there is provided a kind of reasonable in design, efficiency high and accurately and reliably Current transformer excitation property test data processing method.
The present invention solves its technical problem and takes technical scheme below to realize：
A kind of data processing method of current transformer excitation property test, comprises the following steps：
Step 1, carry out current transformer winding excitation property test, obtain current transformer excitation property measured data；
Step 2, current transformer excitation property measured data is parsed, extract voltage x current measured value；
Interpolation current point is chosen on step 3, unequal interval ground, enters row interpolation to three-phase data with identical electric current array and obtains Take three phase excitation characteristic curve；
Step 4, three phase excitation characteristic curve is analyzed and exports analysis result；
Step 5, judge according to analysis result whether current transformer excitation property is qualified.
The concrete grammar of the step 3 is：Flex point letter is extracted from the threephase current transformer measured data of same interval Breath, before and after flex point extracts n interpolation point altogether, takes point mode as follows：
Wherein, parameter alpha, β ＞ 0, representative value are 2/n；(S x) represents cubic spline interpolations of the curve S in point x to spline； Iav,UavThree-phase mean value for keen current and voltage.According to the interpolated value that above-mentioned formula calculates each phase respectively, phase is obtained With the different magnitudes of voltage of three-phase under electric current array, and exciting characteristic curve is drawn according to Current Voltage.
The step 4 compares the difference of three phase excitation curve using correlation coefficient process, analyzes and export correlation properties value.
Advantages of the present invention and good effect are：
Excitation property test data of the present invention by analysis current transformer, realizes with interval three phase excitation characteristic curve Generate, and quick, effective, convenient, reliable calculating can be carried out to the excitation property of current transformer, solve current transformer The analysis of excitation property and computational problem, effectively ancillary test personnel can improve at the data of current transformer excitation property test Reason efficiency and accuracy.
Description of the drawings
Fig. 1 is the process chart of the present invention；
Fig. 2 is current transformer exciting characteristic curve analysis contrast schematic diagram.
Specific embodiment
The embodiment of the present invention is further described below in conjunction with accompanying drawing：
A kind of data processing method of current transformer excitation property test, as shown in figure 1, comprise the following steps：
Step 1, the test of current transformer winding excitation property is carried out, and measured data is deposited in the way of binary file Storage is in testing equipment.
Step 2, excitation property data are parsed, extract voltage x current measured value.
Interpolation current point is chosen on step 3, unequal interval ground, enters row interpolation to three-phase data with identical electric current array and obtains Take three phase excitation characteristic curve.
In this step, flex point information is extracted from the three-phase transformer measured data of same interval using computer, N interpolation point is extracted altogether before and after flex point, point mode is taken as follows：
Wherein, parameter alpha, β ＞ 0, representative value are 2/n；(S x) represents cubic spline interpolations of the curve S in point x to spline； Iav,UavThree-phase mean value for keen current and voltage..
According to the interpolated value that above-mentioned formula calculates each phase respectively, the different magnitudes of voltage of three-phase under same current, root is obtained Three phase excitation characteristic curve is drawn according to Current Voltage, as shown in Figure 2.
Step 4, three phase excitation characteristic curve is analyzed.
In this step, compare the characteristic difference of three phase excitation using correlation coefficient process, analyze and export related spy Property value.
Step 5, current transformer excitation property is judged according to analysis result, judge whether excitation property is qualified.
It is emphasized that embodiment of the present invention is illustrative, rather than determinate, therefore the present invention is wrapped The embodiment for being not limited to described in specific embodiment is included, every by those skilled in the art's technology according to the present invention scheme The other embodiment for drawing, also belongs to the scope of protection of the invention.

Claims (3)

1. the data processing method that a kind of current transformer excitation property is tested, it is characterised in that comprise the following steps：
Step 1, carry out current transformer winding excitation property test, obtain current transformer excitation property measured data；
Step 2, current transformer excitation property measured data is parsed, extract voltage x current measured value；
Interpolation current point is chosen on step 3, unequal interval ground, enters row interpolation to three-phase data with identical electric current array and obtains three Phase exciting characteristic curve；
Step 4, three phase excitation characteristic curve is analyzed and exports analysis result；
Step 5, judge according to analysis result whether current transformer excitation property is qualified.
2. the data processing method that a kind of current transformer excitation property according to claim 1 is tested, it is characterised in that： The concrete grammar of the step is：Flex point information is extracted from the threephase current transformer measured data of same interval, in flex point Extract n interpolation point altogether in front and back, take point mode as follows：
{ I k , U k } = { I k = s p l i n e ( S &prime; , U k ) , U k = U a v ( 1 - &alpha; k ) } 1 &le; k < &lsqb; ( n + 1 ) / 2 &rsqb; { I a v , U a v } k = &lsqb; ( n + 1 ) / 2 &rsqb; { I k = I a v + &beta; k , U k = s p l i n e ( S , I k ) } ( n + 1 ) / 2 < k &le; n
Wherein, parameter alpha, β ＞ 0, representative value are 2/n；(S x) represents cubic spline interpolations of the curve S in point x to spline；Iav,Uav Three-phase mean value for keen current and voltage.
According to the interpolated value that above-mentioned formula calculates each phase respectively, the different magnitudes of voltage of three-phase under same current array are obtained, and Exciting characteristic curve is drawn according to Current Voltage.
3. the data processing method that a kind of current transformer excitation property according to claim 1 is tested, it is characterised in that： The step 4 compares the difference of three phase excitation curve using correlation coefficient process, analyzes and export correlation properties value.
CN201610839803.5A 2016-09-21 2016-09-21 A kind of data processing method of current transformer excitation property test Active CN106501747B (en)

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Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN101707353A (en) * 2009-12-02 2010-05-12 南京南瑞继保电气有限公司 Inverse time lag over excitation protection method of generator and transformer
US20110210715A1 (en) * 2005-08-09 2011-09-01 Yong Kyun Kim Error Compensating Method for Instrument Transformer
CN103823201A (en) * 2014-02-28 2014-05-28 国家电网公司 Method for checking current transformers for differential protection
CN105116361A (en) * 2015-07-21 2015-12-02 国家电网公司 Method for calculating steady-state error of current transformer based on polynomial interpolation and power function piecewise fitting
CN105467347A (en) * 2015-11-17 2016-04-06 国网浙江省电力公司电力科学研究院 Voltage transformer excitation characteristic curve calculating method

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20110210715A1 (en) * 2005-08-09 2011-09-01 Yong Kyun Kim Error Compensating Method for Instrument Transformer
CN101707353A (en) * 2009-12-02 2010-05-12 南京南瑞继保电气有限公司 Inverse time lag over excitation protection method of generator and transformer
CN103823201A (en) * 2014-02-28 2014-05-28 国家电网公司 Method for checking current transformers for differential protection
CN105116361A (en) * 2015-07-21 2015-12-02 国家电网公司 Method for calculating steady-state error of current transformer based on polynomial interpolation and power function piecewise fitting
CN105467347A (en) * 2015-11-17 2016-04-06 国网浙江省电力公司电力科学研究院 Voltage transformer excitation characteristic curve calculating method

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