CN105303065A - Current transformer operation condition testing method - Google Patents

Abstract

The invention discloses a current transformer operation condition testing method which is high in efficiency and comprehensive and accurate in test result. According to the testing method, by collecting basic information data and site operation data of a current transformer, the collected data are classified, and a current transformer operation state value RI is calculated, and by means of the corresponding relation between a preset current transformer operation condition value and the operation state, the actual operation state corresponding to an actual operation condition value of the current transformer is determined. The testing method is high in efficiency, the situation that due to man-made reasons, equipment normally operating originally breaks down is avoided, the influence on the current transformer from secondary load values, primary current percentage values, environment temperature, relative environment humidity, residual magnetism and an adjacent primary conductor magnetic field is considered in the testing method, the operation condition of the current transformer can be tested comprehensively, and it is ensured that the final obtained test result is accurate, comprehensive and high in reliability. The method is suitable for being applied to and popularized in the technical field of gateway metering equipment state evaluation.

Description

A kind of operating condition method of inspection of current transformer

Technical field

The present invention relates to energy metering equipment state assessment technology field, especially a kind of operating condition method of inspection of current transformer.

Background technology

In order to ensure that current transformer can normally run and the reliability of continuous data, usually need to carry out long-range estimation to the operating condition of current transformer, the existing current transformer operating condition method of inspection is mostly the mode adopting desk checking, the mode of desk checking needs a large amount of computation process of manually carrying out field test and complexity, inefficiency, secondly, manually when carrying out on-the-spot accuracy test to current transformer, repetitious operation being carried out to current transformer, causing the normal device fails run originally, there is larger potential faults, in addition, the existing current transformer operating condition method of inspection is only simple to be detected the equipment quality of current transformer, and the condition monitoring of current transformer is often out in the cold, and the impact that the fault of this part is brought is sometimes very larger, therefore, the existing current transformer operating condition method of inspection can not realize the complete examination of current transformer operating condition, cause the operating condition assay that finally draws inaccurate, and manual intervention easily makes mistakes and causes assay reliability low, accurately cannot grasp the operating condition dynamic security stability of electric energy current transformer, and then also cannot ensure each main electrical current mutual inductor safety, stable, accurate operation, shortage is dynamically followed the tracks of accident treatment information and is analyzed, Dynamic controlling can not be carried out to catastrophic failure.

Summary of the invention

Technical matters to be solved by this invention is to provide the high and operating condition method of inspection of the comprehensive and accurate current transformer of assay of a kind of efficiency.

The technical solution adopted for the present invention to solve the technical problems is: the operating condition method of inspection of this current transformer, comprises the following steps:

The basic information data of A, collected current mutual inductor and on-the-spot service data;

B, data to be classified, data are divided into following two classes: current transformer basic information data, current transformer Monitoring Data;

C, according to current transformer basic information data, current transformer Monitoring Data calculating current mutual inductor operating condition value R _i; By the current transformer operating condition value preset and the corresponding relation of running status, determine the actual motion state corresponding to actual operating mode value of current transformer.

Further, described current transformer operating condition value R _ifollowing formulae discovery is adopted to obtain:

Described R _i=ω _iSe _sI+ ω _iIe _iI+ ω _iTe _tI+ ω _iHe _hI+ ω _iRe _rI+ ω _iMe _mI, and ω _iS+ ω _iI+ ω _iT+ ω _iH+ ω _iR+ ω _iM=1;

$E_{SI}=\left\{\begin{array}{c}\begin{array}{c}1-\left|S_I-S_{I0}\right|/S_{I0}\&times;100\%,0\&le;S_I<S_{I0}\\ 1,S_{I0}\&le;S_I<S_{In}\\ 1-\left|S_I-S_{In}\right|/S_{In}\&times;100\%,S_{In}<S_I\&le;2S_{In}\\ 1,S_I>2S_{In}\end{array}\end{array}\right.,$ Wherein, S _ifor on-line monitoring obtains the secondary load of current transformer, S _infor the rated load of current transformer, S _i0for the secondary load lower limit of current transformer;

$E_{II}=\left\{\begin{array}{cc}{I}_I,& 0\&le;I_I<1\\ 1,& 1\&le;I_I\&le;I_{Imax}\\ 0,& I_I>I_{Imax}\end{array}\right.,$ Wherein, I _ifor the primary current percentage value of current transformer, the primary current percentage value of current transformer refers to the ratio of the rated current of the current transformer primary current that on-line monitoring obtains and current transformer, I _imaxfor the primary current number percent maximal value of current transformer;

wherein, T _iambient temperature value residing for current transformer, T _infor the specified ambient temperature value of current transformer, C _tI1and C _tI2for temperature causes the rate of change coefficient of variation;

wherein, H _iambient humidity value residing for current transformer, H _infor the specified ambient humidity of current transformer, C _hIfor humidity causes the rate of change of variation;

wherein, t _rIfor the time of defluidization appears in nearest primary current mutual inductor, τ _rfor remanent magnetism damping time constant;

wherein, M _ifor closing on Primary Conductor magnetic field intensity, M _infor specified magnetic field intensity, C _mIfor magnetic field intensity causes the rate of change coefficient of variation.

Further, described weights ω _iS, ω _iI, ω _iT, ω _iH, ω _iR, ω _iMadopt and determine with the following method, the method comprises the following steps:

G1, determine order relation: at { E _sI, E _iI, E _tI, E _hI, E _rI, E _mIin select proportion maximum a type be designated as G ₁ ^*; Then the type selecting proportion maximum in five types of remainder is designated as G ₂ ^*; The type selecting proportion maximum in four types of remainder is designated as G ₃ ^*, the type selecting proportion maximum in three types of remainder is designated as G ₄ ^*, the type selecting proportion maximum in two types of remainder is designated as G ₅ ^*, finally remaining type is designated as G ₆ ^*, its order relation is wherein represent type G ₁ ^*proportion be greater than or be not less than G ₂ ^*, determine E thus _sI, E _iI, E _tI, E _hI, E _rI, E _mIorder relation;

The ratio in judgement of g2, adjacent type proportion size: adjacent type G _k-1with G _kbetween the ratio G of proportion size _k-1/ G _k=η _k, k=6,5,4,3,2, according to G _k-1with G _kproportion size, η _kspan be 1.0-1.8;

G3, scale-up factor calculate: g2 step is drawn η _kvalue brings following formula into:

$\left\{\begin{array}{c}{\mathrm{\&omega;}}_m={\left(1+\underset{k=2}{\overset{m}{\&Sigma;}}\underset{i=k}{\overset{m}{\&Pi;}}{\mathrm{\&eta;}}_i\right)}^{-1}\\ {\mathrm{\&omega;}}_{k-1}={\mathrm{\&eta;}}_k{\mathrm{\&omega;}}_k,k=m,m-1,...,2\end{array}\right.$ Wherein, m=6

G can be calculated ₁, G ₂, G ₃, G ₄, G ₅, G ₆weight vector ω=[ω ₁, ω ₂, ω ₃, ω ₄, ω ₅, ω ₆], ω ₁, ω ₂, ω ₃, ω ₄, ω ₅, ω ₆corresponding G ₁, G ₂, G ₃, G ₄, G ₅, G ₆weights, just correspondence can draw ω according to the order relation determined _iS, ω _iI, ω _iT, ω _iH, ω _iR, ω _iMvalue.

Beneficial effect of the present invention: the operating condition method of inspection of this current transformer passes through the basic information data of collected current mutual inductor and on-the-spot service data, carries out classification and calculating current mutual inductor operating condition value R to the data of collecting _iby the current transformer operating condition value preset and the corresponding relation of running status, determine the actual motion state corresponding to actual operating mode value of current transformer, this method of inspection is the running status by drawing current transformer to the analysis of data, without the need to manually carrying out field test, efficiency is high, secondly, decrease artificial intervention, there will not be because artificial origin causes the normal device fails run originally, equipment failure hidden danger is lower, moreover, this method of inspection considers secondary load value, primary current percentage value, environment temperature, envionmental humidity, remanent magnetism, contiguous Primary Conductor magnetic field is on the impact of current transformer, the complete examination of current transformer operating condition can be realized, ensure that the operating condition assay finally drawn is accurate, comprehensively, reliability is high, accurately can grasp the dynamic security stability of electric energy current transformer operating condition, and then ensure each main electrical current mutual inductor safety, stable, accurate operation, can dynamically follow the tracks of accident treatment information and analyze, thus Dynamic controlling is carried out to catastrophic failure.

Embodiment

The operating condition method of inspection of current transformer of the present invention, comprises the following steps:

The basic information data of A, collected current mutual inductor and on-the-spot service data, the basic information data of current transformer can be obtained by existing metering production scheduling platform (MDS), metering production scheduling platform (MDS) summarizes all Back ground Informations of the current transformer supply of material, when the basic information data of collected current mutual inductor, the related data that metering production scheduling platform stores only need be called, the on-the-spot service data of current transformer can be obtained by existing power information acquisition system, power information acquisition system can realize the metering electricity of current transformer, the collection monitoring of the Various types of data such as operating condition and logout, wherein, on-line monitoring and intelligent diagnostics module are by image data, the compare of analysis of event and data mining, the ruuning situation of electric energy meter is diagnosed and analyzes, Timeliness coverage electricity, the abnormal conditions such as load, when the on-the-spot service data of collected current mutual inductor, only need call the related data that power information acquisition system gathers,

B, data to be classified, data are divided into following two classes: current transformer basic information data, current transformer Monitoring Data;

C, according to current transformer basic information data, current transformer Monitoring Data calculating current mutual inductor operating condition value R _i; By the current transformer operating condition value preset and the corresponding relation of running status, determine the actual motion state corresponding to actual operating mode value of current transformer.

The corresponding relation of current transformer operating condition value and running status is as shown in the table:

The operating condition method of inspection of this current transformer passes through the basic information data of collected current mutual inductor and on-the-spot service data, carries out classification and calculating current mutual inductor operating condition value R to the data of collecting _iby the current transformer operating condition value preset and the corresponding relation of running status, determine the actual motion state corresponding to actual operating mode value of current transformer, this method of inspection is the running status by drawing current transformer to the analysis of data, without the need to manually carrying out field test, efficiency is high, secondly, decrease artificial intervention, there will not be because artificial origin causes the normal device fails run originally, equipment failure hidden danger is lower, moreover, this method of inspection considers secondary load value, primary current percentage value, environment temperature, envionmental humidity, remanent magnetism, contiguous Primary Conductor magnetic field is on the impact of current transformer, the complete examination of current transformer operating condition can be realized, ensure that the operating condition assay finally drawn is accurate, comprehensively, reliability is high, accurately can grasp the dynamic security stability of electric energy current transformer operating condition, and then ensure each main electrical current mutual inductor safety, stable, accurate operation, can dynamically follow the tracks of accident treatment information and analyze, thus Dynamic controlling is carried out to catastrophic failure.

Described current transformer operating condition value R _ifollowing formulae discovery is adopted to obtain:

Described R _i=ω _iSe _sI+ ω _iIe _iI+ ω _iTe _tI+ ω _iHe _hI+ ω _iRe _rI+ ω _iMe _mI, and ω _iS+ ω _iI+ ω _iT+ ω _iH+ ω _iR+ ω _iM=1;

$E_{SI}=\left\{\begin{array}{c}\begin{array}{c}1-\left|S_I-S_{I0}\right|/S_{I0}\&times;100\%,0\&le;S_I<S_{I0}\\ 1,S_{I0}\&le;S_I<S_{In}\\ 1-\left|S_I-S_{In}\right|/S_{In}\&times;100\%,S_{In}<S_I\&le;2S_{In}\\ 1,S_I>2S_{In}\end{array}\end{array}\right.,$ Wherein, S _ifor on-line monitoring obtains the secondary load of current transformer, Current Transformer Secondary side does not allow open circuit, and load is the smaller the better, and the on-line testing method of current transformer secondary load is for adopt wire laying mode at the scene to obtain voltage U from transformer circuit top ₀, then from observation circuit, obtain current value, S _i=U ₀× I ₂; S _infor the rated load of current transformer, S _i0for the secondary load lower limit of current transformer, when the secondary rated current of current transformer is 5A, the secondary load lower limit S of current transformer _i0for 3.75VA, when the secondary rated current of current transformer is 1A, the secondary load lower limit S of current transformer _i0for 1VA;

$E_{II}=\left\{\begin{array}{cc}{I}_I,& 0\&le;I_I<1\\ 1,& 1\&le;I_I\&le;I_{Imax}\\ 0,& I_I>I_{Imax}\end{array}\right.,$ Wherein, I _ifor the primary current percentage value of current transformer, the primary current percentage value of current transformer refers to the ratio of the rated current of the current transformer primary current that on-line monitoring obtains and current transformer, I _imaxfor the primary current number percent maximal value of current transformer, its maximal value is 120%;

wherein, T _iambient temperature value residing for current transformer, T _infor the specified ambient temperature value of current transformer, according to electric power mutual-inductor JJG1021-2007 standard verification, the current transformer error change that environment temperature independent role causes is no more than fundamental error limit value 1/4, and in test condition, temperature range is-25 ~ 55 DEG C, at rated temperature T _inunder the variation that causes close to 0, and when temperature far exceeds the upper limit, lower range, its change caused close to fundamental error limit value 1/4, specified environment temperature T _inbe 25 DEG C, C _tI1and C _tI2for temperature causes the rate of change coefficient of variation, get C respectively _tI1=2, C _tI2=3;

wherein, H _iambient humidity value residing for current transformer, H _infor the specified ambient humidity of current transformer, C _hIfor humidity causes the rate of change of variation; Be not more than 95% according to regulation envionmental humidity in electric power mutual-inductor JJG1021-2007 standard verification, the current transformer error change that ambient humidity independent role causes is no more than fundamental error limit value 1/8, when ambient humidity is less than specified humidity H _inin time, is deteriorated accordingly close to 0, specified ambient humidity H _inbe 65%, humidity causes the rate of change C of variation _hIbe 5%;

wherein, t _rIfor the time of defluidization appears in nearest primary current mutual inductor, τ _rfor remanent magnetism damping time constant, remanent magnetism damping time constant unit min, current transformer is when electric current declines suddenly, current transformer core may produce remanent magnetism, it will make iron core magnetic conductance decline, affect accuracy of instrument transformers, specify in current transformer JJG1021-2007 standard verification, for the variation limit value that remanence of current transformer independent role causes, be no more than 1/3 of fundamental error limit value, remanence of current transformer is cut off the electricity supply suddenly by big current situation, the Secondary Winding reason such as to open a way suddenly produces, main manifestations is Secondary Winding defluidization, remanent magnetism size and load current number percent are proportionate, along with passage of time remanent magnetism DC component decays to 0 gradually, the impact of current transformer error is also reduced gradually, for remanent magnetism damping time constant τ _rfor 50min,

wherein, M _ifor closing on Primary Conductor magnetic field intensity, it closes on Primary Conductor magnetic field intensity and is restricted to 100 μ T, M _infor specified magnetic field intensity, C _mIfor magnetic field intensity causes the rate of change coefficient of variation; Specify in electric power mutual-inductor JJG1021-2007 standard verification, for the variation limit value that current transformer contiguous Primary Conductor magnetic field independent role causes, be no more than 1/4 of fundamental error limit value, when magnetic field intensity is less than specified magnetic field intensity M _inin time, is deteriorated accordingly close to 0, specified magnetic field intensity M _inbe 50 μ T, magnetic field intensity causes the rate of change coefficient C of variation _mIbe 10.

The current transformer operating condition value R utilizing said method to calculate _iaccurately, comprehensively, reliability is high, accurately can grasp the operating condition dynamic security stability of current transformer, and then ensure current transformer safety, stable, accurately run, can current transformer accident treatment information dynamically be followed the tracks of and be analyzed, thus Dynamic controlling is carried out to current transformer catastrophic failure.

In the above-described embodiment, described weights ω _iS, ω _iI, ω _iT, ω _iH, ω _iR, ω _iMclassical layer fractional analysis can be adopted to draw, but this method not easily constructs the differentiation battle array meeting coherence request, therefore, the invention provides a kind of simple effective method to determine weights ω _iS, ω _iI, ω _iT, ω _iH, ω _iR, ω _iM, the method comprises the following steps:

G1, determine order relation: at { E _sI, E _iI, E _tI, E _hI, E _rI, E _mIin select proportion maximum a type be designated as G ₁ ^*; Then the type selecting proportion maximum in five types of remainder is designated as G ₂ ^*; The type selecting proportion maximum in four types of remainder is designated as G ₃ ^*, the type selecting proportion maximum in three types of remainder is designated as G ₄ ^*, the type selecting proportion maximum in two types of remainder is designated as G ₅ ^*, finally remaining type is designated as G ₆ ^*, its order relation is wherein represent type G ₁ ^*proportion be greater than or be not less than G ₂ ^*, determine E thus _sI, E _iI, E _tI, E _hI, E _rI, E _mIorder relation;

The ratio in judgement of g2, adjacent type proportion size: adjacent type G _k-1with G _kbetween the ratio G of proportion size _k-1/ G _k=η _k, k=6,5,4,3,2, according to G _k-1with G _kproportion size, η _kspan be 1.0-1.8; η _kthe value rule judged is as described below:

G3, scale-up factor calculate: g2 step is drawn η _kvalue brings following formula into:

$\left\{\begin{array}{c}{\mathrm{\&omega;}}_m={\left(1+\underset{k=2}{\overset{m}{\&Sigma;}}\underset{i=k}{\overset{m}{\&Pi;}}{\mathrm{\&eta;}}_i\right)}^{-1}\\ {\mathrm{\&omega;}}_{k-1}={\mathrm{\&eta;}}_k{\mathrm{\&omega;}}_k,k=m,m-1,...,2\end{array}\right.$ Wherein, m=6

G can be calculated ₁, G ₂, G ₃, G ₄, G ₅, G ₆weight vector ω=[ω ₁, ω ₂, ω ₃, ω ₄, ω ₅, ω ₆], ω ₁, ω ₂, ω ₃, ω ₄, ω ₅, ω ₆corresponding G ₁, G ₂, G ₃, G ₄, G ₅, G ₆weights, just correspondence can draw ω according to the order relation determined _iS, ω _iI, ω _iT, ω _iH, ω _iR, ω _iMvalue.

The weights utilizing said method to draw more tally with the actual situation the secondary load value of middle current transformer, primary current percentage value, environment temperature, envionmental humidity, remanent magnetism, contiguous proportion shared by Primary Conductor magnetic field, can make finally to draw that the operating condition state value of current transformer conforms to more with actual operating condition state, its matching degree and accuracy higher.

Claims (3)

1. an operating condition method of inspection for current transformer, is characterized in that comprising the following steps:

The basic information data of A, collected current mutual inductor and on-the-spot service data;

B, data to be classified, data are divided into following two classes: current transformer basic information data, current transformer Monitoring Data;

C, according to current transformer basic information data, current transformer Monitoring Data calculating current mutual inductor operating condition value R _i; By the current transformer operating condition value preset and the corresponding relation of running status, determine the actual motion state corresponding to actual operating mode value of current transformer.

2. the operating condition method of inspection of current transformer as claimed in claim 1, is characterized in that: described current transformer operating condition value R _ifollowing formulae discovery is adopted to obtain:

Described R _i=ω _iSe _sI+ ω _iIe _iI+ ω _iTe _tI+ ω _iHe _hI+ ω _iRe _rI+ ω _iMe _mI, and ω _iS+ ω _iI+ ω _iT+ ω _iH+ ω _iR+ ω _iM=1;

$E_{\mathrm{SI}}=\left\{\begin{array}{c}1-|S_I-S_{I0}|/S_{I0}\&times;100\%,0\&le;S_I<S_{I0}\\ 1,S_{I0}\&le;S_I\&le;S_{\mathrm{In}}\\ 1-|S_I-S_{\mathrm{In}}|/S_{\mathrm{In}}\&times;100\%,S_{\mathrm{In}}<S_I\&le;2S_{\mathrm{In}}\\ 0,S_I>2S_{\mathrm{In}}\end{array}\right.,$ Wherein, S _ifor on-line monitoring obtains the secondary load value of current transformer, S _infor the rated load of current transformer, S _i0for the secondary load lower limit of current transformer;

$E_{\mathrm{II}}=\left\{\begin{array}{cc}{I}_I,& 0\&le;I_I<1\\ 1,& 1\&le;I_I\&le;I_{I\max }\\ 0,& I_I>I_{I\max }\end{array}\right.,$ Wherein, I _ifor the primary current percentage value of current transformer, the primary current percentage value of current transformer refers to the ratio of the rated current of the current transformer primary current that on-line monitoring obtains and current transformer, I _imaxfor the primary current number percent maximal value of current transformer;

wherein, T _iambient temperature value residing for current transformer, T _infor the specified ambient temperature value of current transformer, C _tI1and C _tI2for temperature causes the rate of change coefficient of variation;

wherein, H _iambient humidity value residing for current transformer, H _infor the specified ambient humidity of current transformer, C _hIfor humidity causes the rate of change of variation;

wherein, t _rIfor the time of defluidization appears in nearest primary current mutual inductor, τ _rfor remanent magnetism damping time constant;

wherein, M _ifor closing on Primary Conductor magnetic field intensity, M _infor specified magnetic field intensity, C _mIfor magnetic field intensity causes the rate of change coefficient of variation.

3. the operating condition method of inspection of current transformer as claimed in claim 2, is characterized in that: described weights ω _iS, ω _iI, ω _iT, ω _iH, ω _iR, ω _iMadopt and determine with the following method, the method comprises the following steps:

G1, determine order relation: at { E _sI, E _iI, E _tI, E _hI, E _rI, E _mIin select proportion maximum a type be designated as G ₁ ^*; Then the type selecting proportion maximum in five types of remainder is designated as G ₂ ^*; The type selecting proportion maximum in four types of remainder is designated as G ₃ ^*, the type selecting proportion maximum in three types of remainder is designated as G ₄ ^*, the type selecting proportion maximum in two types of remainder is designated as G ₅ ^*, finally remaining type is designated as G ₆ ^*, its order relation is G ₁ ^*> G ₂ ^*> G ₃ ^*> G ₄ ^*> G ₅ ^*> G ₆ ^*, wherein G ₁ ^*> G ₂ ^*represent type G ₁ ^*proportion be greater than or be not less than G ₂ ^*, determine E thus _sI, E _iI, E _tI, E _hI, E _rI, E _mIorder relation;

The ratio in judgement of g2, adjacent type proportion size: adjacent type G _k-1with G _kbetween the ratio G of proportion size _k-1/ G _k=η _k, k=6,5,4,3,2, according to G _k-1with G _kproportion size, η _kspan be 1.0-1.8;

G3, scale-up factor calculate: g2 step is drawn η _kvalue brings following formula into:

$\left\{\begin{array}{c}{\mathrm{\&omega;}}_m={(1+\underset{k=2}{\overset{m}{\&Sigma;}}\underset{i=k}{\overset{m}{\&Pi;}}{\mathrm{\&eta;}}_i)}^{-1}\\ {\mathrm{\&omega;}}_{k-1}={\mathrm{\&eta;}}_k{\mathrm{\&omega;}}_k,k=m,m-1,...,2\end{array}\right.$ Wherein, m=6

G can be calculated ₁, G ₂, G ₃, G ₄, G ₅, G ₆weight vector ω=[ω ₁, ω ₂, ω ₃, ω ₄, ω ₅, ω ₆], ω ₁, ω ₂, ω ₃, ω ₄, ω ₅, ω ₆corresponding G ₁, G ₂, G ₃, G ₄, G ₅, G ₆weights, just correspondence can draw ω according to the order relation determined _iS, ω _iI, ω _iT, ω _iH, ω _iR, ω _iMvalue.