CN105301420A - Current transformer state examination method - Google Patents

Abstract

The invention discloses a current transformer state examination method which is efficient and can obtain comprehensive and accurate examination results, comprising: collecting the basic information data of a current transformer and on-site operation data; classifying the collected data, and calculating a current transformer operation state value GC; and according to the corresponding relation between a preset current transformer state value and an operation state, determining the real operation state corresponding to the real state value of the current transformer. The current transformer state examination method is efficient, and can avoid breaking down of normal operation equipment caused by man-made reasons; the method comprehensively considers the basic information data, detection data, monitoring data and family defect data of a current transformer, can completely check states of the current transformer and guarantee the accuracy, comprehensiveness and high reliability of a final detection result, and is suitable for popularization and application in the gateway metering equipment state assessment technical field.

Description

A kind of current transformer thermodynamic state verification method

Technical field

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

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 running status of current transformer, existing current transformer thermodynamic state verification method 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, artificial when carrying out on-the-spot accuracy test to current transformer, unclamp the connection terminal of current transformer and screw operation of etc.ing, often has the phenomenons such as the loosening or stripped thread of connection terminal repeatedly, cause the normal device fails run originally, there is larger potential faults; Moreover, the desk checking method of existing current transformer only payes attention to the detection to current transformer accuracy and wiring correctness, the complete examination of current transformer state can not be realized, cause the assay that finally draws inaccurate, and manual intervention easily makes mistakes and causes assay reliability low, accurately cannot grasp the dynamic security stability of current transformer, and then also cannot ensure each main electrical current mutual inductor safety, stable, accurately run, shortage is dynamically followed the tracks of accident treatment information and is analyzed, and can not carry out Dynamic controlling to catastrophic failure.

Summary of the invention

Technical matters to be solved by this invention is to provide a kind of high and assay comprehensive and accurate current transformer thermodynamic state verification method of efficiency.

The technical solution adopted for the present invention to solve the technical problems is: this current transformer thermodynamic state verification method, 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 four classes: current transformer basic information data, current transformer detect data, current transformer Monitoring Data, current transformer family defective data;

C, according to current transformer basic information data, current transformer detect data, current transformer Monitoring Data, current transformer family defective data calculating current mutual inductor running status value G _c, by the current transformer state value preset and the corresponding relation of running status, determine the actual motion state corresponding to actual condition value of current transformer.

Further, described current transformer running status value G _cfollowing formulae discovery is adopted to draw,

$G_C=B_C\×\sqrt[3]{T_C\×M_C\×F_C};$

B _C＝B _C1+B _C6+B _C3+B _C5+B _C4；

Wherein,

C _1-1A, C _1-2A, C _1-3A, C _1-4A, C _1-5Abe respectively the ratio difference that current transformer laboratory verification selectes 5 load point, C _1-1B, C _1-2B, C _1-3B, C _1-4B, C _1-5Bbe respectively the phase differential that current transformer laboratory verification selectes 5 load point;

B _c6=20-C ₆, C ₆for current transformer runs year number;

c _3Afor same batch qualified current transformer is at U _n, I _n, cosj=1 time basic ratio difference standard deviation, c _3Bfor same batch qualified current transformer is at U _n, I _n, cosj=1 time master phase difference standard deviation

B _c5=20 × (1-C ₅), C ₅for same batch current transformer operation troubles rate, C ₅=because of quality problems current transformer quantity out of service/batch current transformer total quantity;

B _c4=10 × (1-C ₄), C ₄for the defective return of goods of same producer current transformer batch rate: C ₄=defective current transformer return of goods batch size/supply the total batch size of current transformer;

$T_C=\frac{3T_{C2}}{10}+\frac{3T_{C8}}{10}+\frac{3T_{C9}}{10}+\frac{T_{C10}}{10};$

Wherein, $T_{C2}=\frac{{\&Sigma;}_{i=1}^5{T}_{C2i}}{5},$ c _2-iAfor the ratio difference of current mutual inductor on site real-load examination, C _2-iBfor the phase differential of current mutual inductor on site real-load examination, work as T _c2iduring <0, T _c2i=0, i=1,2 ... 5;

c ₈for the on-line monitoring ratio difference of current transformer, work as T _c8during <0, T _c8=0;

c ₉for the on-line monitoring phase differential of current transformer, work as T _c9during <0, T _c9=0;

C _10Afor the standard deviation of the on-line monitoring ratio difference of current transformer, C _10Bfor the standard deviation of the on-line monitoring phase differential of current transformer, work as C _10A<0.1 × limit value and C _10Bduring <0.1 × limit value, T _c10=1; Otherwise, work as T _c10during <0, T _c10=0;

M _c=M _c11; c ₁₁for current transformer on-line monitoring anomalous event quantity;

n is family's current transformer total quantity; N (1≤n≤N) is the current transformer number that this family's defect occurs, C ₇for current transformer family defect value.

Beneficial effect of the present invention: this current transformer thermodynamic state verification method 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 running status value G to the data of collecting _cby the current transformer state value preset and the corresponding relation of running status, determine the actual motion state corresponding to actual condition 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 has considered basic information data, detection data, Monitoring Data and family's defective data of current transformer, the complete examination of current transformer state can be realized, the assay that guarantee finally draws accurately, comprehensive, reliability is high, accurately can grasp the dynamic security stability of current transformer, and then ensure each main electrical current mutual inductor safety, stable, accurately run, can dynamically follow the tracks of accident treatment information and analyze, thus Dynamic controlling is carried out to catastrophic failure.

Embodiment

Current transformer thermodynamic state verification method 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) to summarize after full performance before the current transformer supply of material, arrival each link gauging error data such as sample comparison, sampling observation, Quan Jian, each supplier acceptance of the bid batch, receipt lot, return of goods batch information and run the failure condition that link occurs, 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 collection monitoring of the Various types of data such as the operating condition of current transformer and logout, wherein, on-line monitoring and intelligent diagnostics module are by the compare of analysis of image data, event and data mining, the ruuning situation of current transformer is diagnosed and analyzes, the abnormal conditions such as Timeliness coverage load, when the on-the-spot service data of collected current mutual inductor, the related data that power information acquisition system gathers only need be called;

B, data to be classified, data are divided into following four classes: current transformer basic information data, current transformer detect data, current transformer Monitoring Data, current transformer family defective data;

C, according to current transformer basic information data, current transformer detect data, current transformer Monitoring Data, current transformer family defective data calculating current mutual inductor running status value G _c, by the current transformer state value preset and the corresponding relation of running status, determine the actual motion state corresponding to actual condition value of current transformer.

This current transformer thermodynamic state verification method 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 running status value G to the data of collecting _cby the current transformer state value preset and the corresponding relation of running status, determine the actual motion state corresponding to actual condition 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 has considered basic information data, detection data, Monitoring Data and family's defective data of current transformer, the complete examination of current transformer state can be realized, the assay that guarantee finally draws accurately, comprehensive, reliability is high, accurately can grasp the dynamic security stability of current transformer, and then ensure each main electrical current mutual inductor safety, stable, accurately run, can dynamically follow the tracks of accident treatment information and analyze, thus Dynamic controlling is carried out to catastrophic failure.

Described current transformer running status value G _cfollowing formulae discovery is adopted to draw,

B _c=B _c1+ B _c6+ B _c3+ B _c5+ B _c4, B _cfor current transformer base state value, the performance quality of this state value reflection current transformer arrangement itself;

Wherein,

C _1-1A, C _1-2A, C _1-3A, C _1-4A, C _1-5Abe respectively the ratio difference that current transformer laboratory verification selectes 5 load point, C _1-1B, C _1-2B, C _1-3B, C _1-4B, C _1-5Bbe respectively the phase differential that current transformer laboratory verification selectes 5 load point, these quantity of states can reflect the quality of the intrinsic metering performance of current transformer; Described 5 load point can be chosen according to actual needs, under normal circumstances, and C _1-1Afor U _n, 1.2I _n, cos=1 time ratio difference, C _1-1Bfor U _n, 1.2I _n, cosj=1 time phase differential; C _1-2Afor U _n, I _n, cosj=1 time ratio difference, C _1-2Bfor U _n, I _n, cosj=1 time phase differential, C _1-3Afor U _n, 0.2I _n, cosj=1 ratio difference, C _1-3Bfor U _n, 0.2I _n, cosj=1 phase differential, C _1-4Afor U _n, 0.05I _n, cosj=1 time ratio difference, C _1-4Bfor U _n, 0.05I _n, cosj=1 time phase differential, C _1-5Afor U _n, 0.01I _n, cosj=1 time ratio difference, C _1-5Bfor U _n, 0.01I _n, cosj=1 time phase differential, limit value refers to that class of accuracy is the error limit that the active current mutual inductor of 0.2S is corresponding, and value is 0.2;

B _c6=20-C ₆, C ₆for current transformer runs year number, least resolution is 0.5 year, and takes only house not enter principle, as 0-5.9 month be 0 year, 6-11.9 month is 0.5 year, this quantity of state reflects that working time is on the impact of current mulual inductor malfunction rate;

c _3Afor same batch qualified current transformer is at U _n, I _n, cosj=1 time basic ratio difference standard deviation, c _3Bfor same batch qualified current transformer is at U _n, I _n, cosj=1 time master phase difference standard deviation the quality of this quantity of state reflection batch current transformer quality control, limit value refers to that class of accuracy is the error limit that the active current mutual inductor of 0.2S is corresponding, and value is 0.2;

B _c5=20 × (1-C ₅), C ₅for same batch current transformer operation troubles rate, C ₅=because of quality problems current transformer quantity out of service/batch current transformer total quantity, the quality of this quantity of state reflection running current mutual inductor batch quality;

B _c4=10 × (1-C ₄), C ₄for the defective return of goods of same producer current transformer batch rate: C ₄=defective current transformer return of goods batch size/supply the total batch size of current transformer, this quantity of state reflection prestige of current transformer manufacturing firm, management and quality level;

$T_C=\frac{3T_{C2}}{10}+\frac{3T_{C8}}{10}+\frac{3T_{C9}}{10}+\frac{T_{C10}}{10};$

Wherein, $T_{C2}=\frac{{\&Sigma;}_{i=1}^5{T}_{C2i}}{5},$ c _2-iAfor the ratio difference of current mutual inductor on site real-load examination, C _2-iBfor the phase differential of current mutual inductor on site real-load examination, work as T _c2iduring <0, T _c2i=0, i=1,2 ... 5; Under normal circumstances, cycle detection 1.2I _n, I _n, 0.2I _n, 0.05I _n, 0.01I _nthe ratio difference C of totally 5 load point _2-iA, under normal circumstances, cycle detection 1.2I _n, I _n, 0.2I _n, 0.05I _n, 0.01I _nthe phase differential C of totally 5 load point _2-iB, limit value refers to that class of accuracy is the error limit that the active current mutual inductor of 0.2S is corresponding, and value is 0.2;

c ₈for the on-line monitoring ratio difference of current transformer, this quantity of state reflection current transformer Real-time Error situation, works as T _c8during <0, T _c8=0; C ₈for the mean value of the on-line monitoring leakage current mutual inductor ratio difference absolute value between the frequent loading zone of reality, according to the primary current average in multiple scoring cycle (getting 5) above with standard deviation δ _x, determine between actual frequent loading zone select n error monitoring point often between loading zone in the current scoring cycle, in computation interval, ratio difference average is C ₈; If n is 0, get the monitoring rate value difference in last scoring cycle, limit value refers to that class of accuracy is the error limit that the active current mutual inductor of 0.2S is corresponding, and value is 0.2;

c ₉for the on-line monitoring phase differential of current transformer, this quantity of state reflection current transformer Real-time Error situation, works as T _c9during <0, T _c9=0; C ₉for the mean value of the on-line monitoring leakage current mutual inductor phase differential absolute value between the frequent loading zone of reality, according to the primary current average in multiple scoring cycle (getting 5) above with standard deviation δ _x, determine between actual frequent loading zone select n error monitoring point often between loading zone in the current scoring cycle, in computation interval, phase differential average is C ₉; If n is 0, get the monitoring phase differential in last scoring cycle, limit value refers to that class of accuracy is the error limit that the active current mutual inductor of 0.2S is corresponding, and value is 0.2;

C _10Afor the standard deviation of the on-line monitoring ratio difference of current transformer, C _10Bfor the standard deviation of the on-line monitoring phase differential of current transformer, work as C _10A<0.1 × limit value and C _10Bduring <0.1 × limit value, T _c10=1; Otherwise, work as T _c10during <0, T _c10=0; Limit value refers to that class of accuracy is the error limit that the active current mutual inductor of 0.2S is corresponding, and value is 0.2;

M _c=M _c11; m _cbe the state value of current transformer operation exception, whether this state value reflection current transformer runs abnormal, C ₁₁for current transformer on-line monitoring anomalous event quantity, its anomalous event quantity refer to twice the current transformer running status value computing interval on-line monitoring find current transformer environment temperature, relative humidity, frequency, secondary load, wave form distortion, remanent magnetism, adjacent conductors magnetic field anomalous event quantity, main abnormal event and Rule of judgment as shown in the table;

n is family's current transformer total quantity; N (1≤n≤N) is the current transformer number that this family's defect occurs, C ₇for family's current transformer defect value, current transformer family defect C ₇value is as shown in the table:

defect	family defect C 7value
		on current transformer metering performance without large impact, burst progression risk is little	86% ~ 100%
there is certain influence to current transformer metering performance, can monitor	51% ~ 85%
		there is certain influence to current transformer metering performance, can not monitor	16% ~ 50%
impact is had on current transformer metering performance.	0～15％

The current transformer running status value G utilizing said method to calculate _caccurately, comprehensively, reliability is high, accurately can grasp the 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.

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

Claims (2)

1. a current transformer thermodynamic state verification method, 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 four classes: current transformer basic information data, current transformer detect data, current transformer Monitoring Data, current transformer family defective data;

C, according to current transformer basic information data, current transformer detect data, current transformer Monitoring Data, current transformer family defective data calculating current mutual inductor running status value G _c, by the current transformer state value preset and the corresponding relation of running status, determine the actual motion state corresponding to actual condition value of current transformer.

2. current transformer thermodynamic state verification method as claimed in claim 1, is characterized in that: described current transformer running status value G _cfollowing formulae discovery is adopted to draw,

B _C＝B _C1+B _C6+B _C3+B _C5+B _C4；

Wherein,

C _1-1A, C _1-2A, C _1-3A, C _1-4A, C _1-5Abe respectively the ratio difference that current transformer laboratory verification selectes 5 load point, C _1-1B, C _1-2B, C _1-3B, C _1-4B, C _1-5Bbe respectively the phase differential that current transformer laboratory verification selectes 5 load point;

B _c6=20-C ₆, C ₆for current transformer runs year number;

c _3Afor same batch qualified current transformer is at U _n, I _n, cosj=1 time basic ratio difference standard deviation, c _3Bfor same batch qualified current transformer is at U _n, I _n, cosj=1 time master phase difference standard deviation

B _c5=20 × (1-C ₅), C ₅for same batch current transformer operation troubles rate, C ₅=because of quality problems current transformer quantity out of service/batch current transformer total quantity;

B _c4=10 × (1-C ₄), C ₄for the defective return of goods of same producer current transformer batch rate: C ₄=defective current transformer return of goods batch size/supply the total batch size of current transformer;

$T_C=\frac{3T_{C2}}{10}+\frac{3T_{C8}}{10}+\frac{3T_{C9}}{10}+\frac{T_{C10}}{10};$

Wherein, $T_{C2}=\frac{{\mathrm{\&Sigma;}}_{i=1}^5{T}_{C2i}}{5},$ c _2-iAfor the ratio difference of current mutual inductor on site real-load examination, C _2-iBfor the phase differential of current mutual inductor on site real-load examination, work as T _c2iduring <0, T _c2i=0, i=1,2 ... 5;

c ₈for the on-line monitoring ratio difference of current transformer, work as T _c8during <0, T _c8=0;

c ₉for the on-line monitoring phase differential of current transformer, work as T _c9during <0, T _c9=0;

C _10Afor the standard deviation of the on-line monitoring ratio difference of current transformer, C _10Bfor the standard deviation of the on-line monitoring phase differential of current transformer, work as C _10A<0.1 × limit value and C _10Bduring <0.1 × limit value, T _c10=1; Otherwise, work as T _c10during <0, T _c10=0;

M _c=M _c11; c ₁₁for current transformer on-line monitoring anomalous event quantity;

n is family's current transformer total quantity; N (1≤n≤N) is the current transformer number that this family's defect occurs, C ₇for current transformer family defect value.