CN107085195B - Method and system for matching mutual inductor and electric energy meter of plant station - Google Patents
Method and system for matching mutual inductor and electric energy meter of plant station Download PDFInfo
- Publication number
- CN107085195B CN107085195B CN201710245718.0A CN201710245718A CN107085195B CN 107085195 B CN107085195 B CN 107085195B CN 201710245718 A CN201710245718 A CN 201710245718A CN 107085195 B CN107085195 B CN 107085195B
- Authority
- CN
- China
- Prior art keywords
- error
- electric energy
- combined
- energy meter
- matching
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
- 238000000034 method Methods 0.000 title claims abstract description 23
- 238000009434 installation Methods 0.000 claims abstract description 11
- 238000012216 screening Methods 0.000 claims abstract description 9
- 238000012163 sequencing technique Methods 0.000 claims abstract description 7
- 238000012360 testing method Methods 0.000 claims description 41
- 238000012795 verification Methods 0.000 claims description 8
- 238000005259 measurement Methods 0.000 claims 1
- 230000005540 biological transmission Effects 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 238000011900 installation process Methods 0.000 description 1
Images
Classifications
-
- 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
-
- 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
- G01R35/04—Testing or calibrating of apparatus covered by the other groups of this subclass of instruments for measuring time integral of power or current
Landscapes
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Management, Administration, Business Operations System, And Electronic Commerce (AREA)
Abstract
The invention relates to a method and a system for matching a mutual inductor and an electric energy meter of a station. The steps of matching the mutual inductor and the metering point electric energy meter of the station are as follows: calculating the combined error of the mutual inductor and the basic error of the electric energy meter of the metering point and adding the combined errors to form a combined error matching table of the mutual inductor and the electric energy meter; determining an error threshold value of the combined error pairing table, screening the combined errors in the combined error pairing table meeting the error threshold value range, determining the quantity value of the combined errors meeting the condition, and then arranging the quantity values of which the quantity values are greater than 0 in a descending order; and determining the number of the electric energy meter installed at the metering point according to the sequencing result, and designating the installation position of the electric energy meter corresponding to the number.
Description
Technical Field
The present invention relates to the electrical instrumentation industry and, more particularly, to a method and system for matching transformers and electrical energy meters of a plant station.
Background
The power transmission line loss is composed of theoretical line loss and management line loss, and the theoretical line loss is also called technical line loss, namely loss generated by power transmission equipment. The management line loss is mainly caused by errors of the electric energy metering device and different periods of supply and sale. At present, with the popularization of a remote electric energy acquisition system (TMR), settlement of metering points above provincial level has already realized the synchronization of supply and sale, so the main measure for reducing the management line loss is to reduce the comprehensive error of an electric energy metering device. The comprehensive error of the electric energy metering device refers to the combination of a voltage transformer, a current transformer, a secondary circuit voltage drop and an electric energy meter error of a metering point. At present, the mutual inductor, a secondary circuit and a gateway electric energy meter are separately detected, the mutual inductor and the electric energy meter are randomly combined during field installation, the combined error of the mutual inductor and the electric energy meter at a metering point is not fully considered during random installation, and a matching strategy is not formed to reduce the error of the metering point.
At present, electric energy metering points can be divided into settlement type metering points and assessment type metering points. The settlement type metering points are used for trade settlement, the examination type metering points are used for examination of internal economic and technical indexes, and the settlement type metering points relate to settlement between a power plant and a power grid, different power grid enterprises and between the power grid enterprises and users, so that the combination error of the electric energy metering devices of the settlement type metering points is required to be reduced firstly, and then the combination error of the examination type metering points is reduced according to a matching result.
Disclosure of Invention
In order to solve the problem that the combination error of a mutual inductor and a metering point electric energy meter is not fully considered in the random installation of the mutual inductor and the metering point electric energy meter in the background art, the invention provides a method and a system for matching the mutual inductor and the electric energy meter of a plant station.
The method for matching the mutual inductor and the electric energy meter of the plant station comprises the following steps:
calculating the combined error gamma of each group of voltage transformers and current transformers one by one according to the test pointshBasic error gamma of each electric energy meter with metering pointcForming a combined error matching table of each electric energy meter and each mutual inductor of the metering points;
determining an error threshold E of a combined error matching table of each electric energy meter and each group of mutual inductors of the metering point, screening combined errors in each combined matching table meeting the error threshold range, determining a numerical value of the combined errors meeting conditions, and then arranging the electric energy meters of the metering points with the numerical value of the combined errors larger than 0 in a descending order according to the numerical value of the combined errors;
and determining the number of the electric energy meter installed at the metering point according to the sequencing result, and designating the installation position of the electric energy meter corresponding to the number.
Preferably, the metering points in the method comprise settlement-type metering points and assessment-type metering points.
Preferably, the matching of the mutual inductor and the electric energy meter of the plant station comprises matching of the mutual inductor and the settlement type measuring point electric energy meter of the plant station and matching of the mutual inductor and the assessment type measuring point electric energy meter of the plant station, and the matching sequence is that the mutual inductor and the settlement type measuring point electric energy meter of the plant station are matched firstly, and then the mutual inductor and the assessment type measuring point electric energy meter of the plant station are matched.
Preferably, the step of calculating the sum of the combined error of each group of the voltage transformers and the current transformers and the basic error of each electric energy meter of the metering point one by one according to the test point, and the step of forming the combined error matching table of each electric energy meter of the metering point and each group of transformers comprises the following steps:
solving the combined error gamma of each group of voltage transformers and current transformers by a transformer verification error calculation formulahThe calculation formula is as follows:
γh＝1/3(fI1+fV1+fI2+fV2+fI3+fV3)
+0.0097(I1-V1+I2-V2+I3-V3)tanφ(％)
wherein f isI1、fI2、fI3Is the ratio difference of the current transformer, fV1、fV2、fV3Is the specific difference of the voltage transformer,I1、I2、I3is the angular difference of the current transformer,V1、V2、V3the angle difference is the angular difference of the voltage transformer, and tan phi is the tangent value of the phase difference between the voltage and the current;
solving the basic error gamma of the electric energy meter at the measuring point according to the comprehensive error calculation formula of the electric energy measuring devicecThe calculation formula is as follows:
wherein m is the number of actually measured pulses, m0Is a preset number of pulses.
Preferably, determining an error threshold E of a combined error matching table of each electric energy meter and each group of transformers at a metering point, screening combined errors in each combined matching table satisfying the error threshold range and determining a quantitative value of the combined errors satisfying a condition, comprises:
calculating the average value of all combined errors in the electric energy meter combined error matching table of the mutual inductor and the metering point
And the standard deviation σ;
setting an error threshold value E to be 3 sigma according to a Laplace criterion;
selecting a satisfaction in the combined error pair table
And determining the number of combining errors.
Preferably, when the number of the determined combination errors in the combination error matching table of one electric energy meter of the metering point and the plurality of groups of transformers is equal, the standard deviation of a plurality of test points in each combination error matching table with the equal number of the combination errors is calculated, and the electric energy meter is installed on the group of transformers with the smallest standard deviation, wherein the standard deviation calculation formula is as follows:
wherein S is the standard deviation after calculation, n is the number of test points, and gammaiFor the combined error at the different test points,
the average of the error sums is combined for all test points.
According to another aspect of the present invention, there is provided a system for matching transformers and power meters of a plant, the system comprising:
a combined error pairing table determining unit for calculating the combined error gamma of each group of voltage transformer and current transformer one by one according to the test pointhBasic error gamma of each electric energy meter with metering pointcForming a combined error matching table of each electric energy meter and each mutual inductor of the metering points;
the error threshold value determining unit is used for determining an error threshold value E of a combined error matching table of each electric energy meter and each group of mutual inductors of the metering point, screening combined errors in each combined matching table meeting the error threshold value range, determining the quantity value of the combined errors meeting conditions, and then arranging the electric energy meters of the metering points with the quantity value of the combined errors larger than 0 in a descending order according to the quantity value of the combined errors;
and the measuring point electric energy meter determining unit is used for determining the number of the electric energy meter installed at the measuring point according to the sequencing result and appointing the installation position of the electric energy meter corresponding to the number.
Preferably, the metering points comprise settlement-type metering points and assessment-type metering points.
Preferably, the matching of the mutual inductor and the electric energy meter of the plant station by the system comprises matching of the mutual inductor and the settlement type measuring point electric energy meter of the plant station and matching of the mutual inductor and the assessment type measuring point electric energy meter of the plant station, and the matching sequence is that the mutual inductor and the settlement type measuring point electric energy meter of the plant station are matched firstly, and then the mutual inductor and the assessment type measuring point electric energy meter of the plant station are matched.
Preferably, the system further comprises a mutual inductor combination error determining unit and a measuring point electric energy meter basic error determining unit, wherein the mutual inductor combination error determining unit is used for solving the combination error gamma of each group of voltage mutual inductor and current mutual inductor through a mutual inductor verification error calculation formulahThe calculation formula is as follows: gamma rayh＝1/3(fI1+fV1+fI2+fV2+fI3+fV3)+0.0097(I1-V1+I2-V2+I3-V3)tanφ(％)
Wherein f isI1、fI2、fI3Is the ratio difference of the current transformer, fV1、fV2、fV3Is the specific difference of the voltage transformer,I1、I2、I3is the angular difference of the current transformer,V1、V2、V3the angle difference is the angular difference of the voltage transformer, and tan phi is the tangent value of the phase difference between the voltage and the current;
the basic error determining unit of the electric energy meter at the measuring point is used for solving the basic error gamma of the electric energy meter at the measuring point according to the comprehensive error calculation formula of the electric energy measuring devicecThe calculation formula is as follows:
wherein m is the number of actually measured pulses, m0Is a preset number of pulses.
Preferably, the error threshold value determining unit determines an error threshold value E of a combined error pairing table of each electric energy meter and each group of transformers at the metering point, screens a combined error in each combined pairing table satisfying the error threshold value range, and determines a quantity value of the combined error satisfying a condition, including:
calculating the average value of all combined errors in the electric energy meter combined error matching table of the mutual inductor and the metering point
And the standard deviation σ;
setting an error threshold value E to be 3 sigma according to a Laplace criterion;
selecting a satisfaction in the combined error pair table
And determining the number of combining errors.
Preferably, in the error threshold value determination unit, when the number of the determined combination errors in one electric energy meter of the metering point and the combination error matching table of the plurality of groups of transformers is equal, the standard deviation of a plurality of test points in each combination error matching table with the equal number of the combination errors is calculated, and the electric energy meter is installed on the group of transformers with the smallest standard deviation, and the standard deviation calculation formula is as follows:
wherein S is the standard deviation after calculation, n is the number of test points, and gammaiFor the combined error at the different test points,
the average of the error sums is combined for all test points.
In summary, the matching method and the matching system for matching the mutual inductor and the electric energy meter of the plant station provided by the invention take the plant station as a unit and complete the matching of the electric energy meter and the mutual inductor according to the installation process of the electric energy metering device of the plant station, the matching method takes the combined error of the mutual inductor and the electric energy meter as a starting point to form a matching table of basic errors of the mutual inductor and the electric energy meter, error data meeting requirements are screened according to a set rule for sorting, then the installation position of the electric energy meter is reasonably arranged according to the sorting result by combining with the type of the metering point, and therefore, the influence of the error of the electric energy metering device on line loss calculation is reduced.
Drawings
A more complete understanding of exemplary embodiments of the present invention may be had by reference to the following drawings in which:
FIG. 1 is a flow chart of a method of matching transformers and power meters of a plant in accordance with an embodiment of the present invention; and
fig. 2 is a block diagram of a system for matching transformers and power meters of a plant in accordance with an embodiment of the present invention.
Detailed Description
The exemplary embodiments of the present invention will now be described with reference to the accompanying drawings, however, the present invention may be embodied in many different forms and is not limited to the embodiments described herein, which are provided for complete and complete disclosure of the present invention and to fully convey the scope of the present invention to those skilled in the art. The terminology used in the exemplary embodiments illustrated in the accompanying drawings is not intended to be limiting of the invention. In the drawings, the same units/elements are denoted by the same reference numerals.
Unless otherwise defined, terms (including technical and scientific terms) used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. Further, it will be understood that terms, such as those defined in commonly used dictionaries, should be interpreted as having a meaning that is consistent with their meaning in the context of the relevant art and will not be interpreted in an idealized or overly formal sense.
Fig. 1 is a flowchart of a method for matching transformers and electric energy meters of a plant according to an embodiment of the present invention. As shown in fig. 1, the method 100 of matching transformers and power meters of a plant begins at step 101.
In step 101, each group of voltage transformers and currents are calculated one by one according to the test pointsCombined error gamma of mutual inductorhBasic error gamma of each electric energy meter with metering pointcAnd gamma, forming a combined error matching table of each electric energy meter and each group of mutual inductors of the metering point. In tables 1 to 4 below, basic error test points of the voltage transformer and the current transformer according to the verification procedure of "power transformer" of jjjg 1021-2007 are shown in tables 1 and 2. According to the verification regulation of JJG596-2012 electronic alternating current electric energy meter, the basic error (positive and negative active) test points of the electric energy meter are shown in table 3. The basic error points involved in error matching after combination from tables 1 to 3 are shown in table 4.
TABLE 1 basic error test points of voltage transformer
TABLE 2 basic error test points of current transformer
Meter 3 electric energy meter active basic error (positive and negative active) test point
Meter 4 mutual inductor and electric energy meter basic error test point combination
In step 102, determining an error threshold E of a combined error matching table of each electric energy meter and each group of transformers at a metering point, screening combined errors in each combined matching table meeting the error threshold range and determining a quantity value of the combined errors meeting conditions, and then arranging the electric energy meters of the metering points with the quantity value of the combined errors larger than 0 in a descending order according to the quantity value of the combined errors;
in step 103, the number of the electric energy meter installed at the metering point is determined according to the sequencing result, and the installation position of the electric energy meter corresponding to the number is specified.
Preferably, the metering points in the method comprise settlement-type metering points and assessment-type metering points.
Preferably, the matching of the mutual inductor and the electric energy meter of the plant station comprises matching of the mutual inductor and the settlement type measuring point electric energy meter of the plant station and matching of the mutual inductor and the assessment type measuring point electric energy meter of the plant station, and the matching sequence is that the mutual inductor and the settlement type measuring point electric energy meter of the plant station are matched firstly, and then the mutual inductor and the assessment type measuring point electric energy meter of the plant station are matched.
Preferably, the step of calculating the sum of the combined error of each group of the voltage transformers and the current transformers and the basic error of each electric energy meter of the metering point one by one according to the test point, and the step of forming the combined error matching table of each electric energy meter of the metering point and each group of transformers comprises the following steps:
solving the combined error gamma of each group of voltage transformers and current transformers by a transformer verification error calculation formulahThe calculation formula is as follows:
γh＝1/3(fI1+fV1+fI2+fV2+fI3+fV3)
+0.0097(I1-V1+I2-V2+I3-V3)tanφ(％)
wherein f isI1、fI2、fI3Is the ratio difference of the current transformer, fV1、fV2、fV3Is the specific difference of the voltage transformer,I1、I2、I3is the angular difference of the current transformer,V1、V2、V3the angle difference is the angular difference of the voltage transformer, and tan phi is the tangent value of the phase difference between the voltage and the current;
solving the basic error gamma of the electric energy meter at the measuring point according to the comprehensive error calculation formula of the electric energy measuring devicecThe calculation formula is as follows:
wherein m is the number of actually measured pulses, m0Is a preset number of pulses.
Preferably, determining an error threshold E of a combined error matching table of each electric energy meter and each group of transformers at a metering point, screening combined errors in each combined matching table satisfying the error threshold range and determining a quantitative value of the combined errors satisfying a condition, comprises:
calculating the average value of all combined errors in the electric energy meter combined error matching table of the mutual inductor and the metering point
And the standard deviation σ;
setting an error threshold value E to be 3 sigma according to a Laplace criterion;
selecting a satisfaction in the combined error pair table
And determining the number of combining errors.
Preferably, when the number of the determined combination errors in the combination error matching table of one electric energy meter of the metering point and the plurality of groups of transformers is equal, the standard deviation of a plurality of test points in each combination error matching table with the equal number of the combination errors is calculated, and the electric energy meter is installed on the group of transformers with the smallest standard deviation, wherein the standard deviation calculation formula is as follows:
wherein S is the standard deviation after calculation, n is the number of test points, and gammaiFor the combined error at the different test points,
the average of the error sums is combined for all test points.
Fig. 2 is a block diagram of a system for matching transformers and power meters of a plant in accordance with an embodiment of the present invention. As shown in fig. 2, the system 200 for matching transformers and electric energy meters of a plant station according to the present invention includes a combined error pairing table determining unit 201, an error threshold determining unit 202, and a metering point electric energy meter determining unit 203.
A combined error pairing table determining unit 201 for calculating a combined error γ of each set of the voltage transformer and the current transformer one by one according to the test pointshBasic error gamma of each electric energy meter with metering pointcForming a combined error matching table of each electric energy meter and each mutual inductor of the metering points;
an error threshold determining unit 202, configured to determine an error threshold E of a combined error matching table of each electric energy meter and each group of transformers at a metering point, screen a combined error in each combined matching table that meets the error threshold range, and determine a quantity value of the combined error that meets a condition, and then arrange the electric energy meters at the metering point, where the quantity value of the combined error is greater than 0, in order from large to small according to the quantity value of the combined error;
and the metering point electric energy meter determining unit 203 is used for determining the number of the electric energy meter installed at the metering point according to the sequencing result and appointing the installation position of the electric energy meter corresponding to the number.
Preferably, the metering points comprise settlement-type metering points and assessment-type metering points.
Preferably, the matching of the mutual inductor and the electric energy meter of the plant station by the system comprises matching of the mutual inductor and the settlement type measuring point electric energy meter of the plant station and matching of the mutual inductor and the assessment type measuring point electric energy meter of the plant station, and the matching sequence comprises matching of the mutual inductor and the settlement type measuring point electric energy meter of the plant station and then matching of the mutual inductor and the assessment type measuring point electric energy meter of the plant station
Preferably, the system further comprises a transformer combination error determining unit 204 and a metering point electric energy meter basic error determining unit 205, wherein the transformer combination error determining unit 204 is used for solving the combination error gamma of each group of the voltage transformer and the current transformer through a transformer verification error calculation formulahCalculatingThe formula is as follows:
γh＝1/3(fI1+fV1+fI2+fV2+fI3+fV3)
+0.0097(I1-V1+I2-V2+I3-V3)tanφ(％)
wherein f isI1、fI2、fI3Is the ratio difference of the current transformer, fV1、fV2、fV3Is the specific difference of the voltage transformer,I1、I2、I3is the angular difference of the current transformer,V1、V2、V3the angle difference is the angular difference of the voltage transformer, and tan phi is the tangent value of the phase difference between the voltage and the current;
the basic error determining unit 205 of the electric energy meter at the metering point is used for solving the basic error gamma of the electric energy meter at the metering point according to the comprehensive error calculation formula of the electric energy metering devicecThe calculation formula is as follows:
wherein m is the number of actually measured pulses, m0Is a preset number of pulses.
Preferably, the error threshold determining unit 202 determines an error threshold E of a combined error pairing table of each electric energy meter and each group of transformers at a metering point, screens combined errors in each combined pairing table satisfying the error threshold range, and determines a quantity value of the combined errors satisfying a condition, including:
calculating the average value of all combined errors in the electric energy meter combined error matching table of the mutual inductor and the metering point
And the standard deviation σ;
setting an error threshold value E to be 3 sigma according to a Laplace criterion;
selecting a satisfaction in the combined error pair table
And determining the number of combining errors.
Preferably, in the error threshold value determining unit 202, when the number of the determined combination errors in the combination error matching table of one electric energy meter of a metering point and a plurality of groups of mutual inductors is equal, the standard deviation of a plurality of test points in each combination error matching table with the equal number of the combination errors is calculated, and the electric energy meter is installed on the group of mutual inductors with the smallest standard deviation, wherein the standard deviation calculation formula is as follows:
wherein S is the standard deviation after calculation, n is the number of test points, and gammaiFor the combined error at the different test points,
the average of the error sums is combined for all test points.
Generally, all terms used in the claims are to be interpreted according to their ordinary meaning in the technical field, unless explicitly defined otherwise herein. All references to "a/an/the [ means, component, etc. ] are to be interpreted openly as referring to at least one instance of said means, component, etc., unless explicitly stated otherwise. The steps of any method disclosed herein do not have to be performed in the exact order disclosed, unless explicitly stated.
Claims (12)
1. A method of matching transformers and electrical energy meters of a plant, the method comprising:
summing the combined error of each group of voltage transformers and current transformers and the basic error of each electric energy meter of the metering point one by one according to the test point to form a combined error matching table of each electric energy meter of the metering point and each group of transformers;
determining an error threshold E of a combined error matching table of each electric energy meter and each group of mutual inductors of the metering point, screening combined errors in each combined matching table meeting the error threshold range, determining a numerical value of the combined errors meeting conditions, and then arranging the electric energy meters of the metering points with the numerical value of the combined errors larger than 0 in a descending order according to the numerical value of the combined errors;
and determining the number of the electric energy meter installed at the metering point according to the sequencing result, and designating the installation position of the electric energy meter corresponding to the number.
2. The method of claim 1, wherein the metering points in the method comprise settlement-type metering points and assessment-type metering points.
3. The method according to claim 2, wherein the matching of the transformer and the electric energy meter of the plant comprises matching the transformer and the settlement type metering point electric energy meter of the plant and matching the transformer and the assessment type metering point electric energy meter of the plant, and the matching is performed in the order of matching the transformer and the settlement type metering point electric energy meter of the plant and then matching the transformer and the assessment type metering point electric energy meter of the plant.
4. The method of claim 1, wherein summing the combined error of each set of voltage and current transformers with the base error of each meter at a metering point one by one at the test point, and forming a combined error pair table of each meter at a metering point and each set of transformers comprises:
solving the combined error gamma of each group of voltage transformers and current transformers by a transformer verification error calculation formulahThe calculation formula is as follows:
γh＝1/3(fI1+fV1+fI2+fV2+fI3+fV3)+0.0097(I1-V1+I2-V2+I3-V3)tanφ(％)
wherein f isI1、fI2、fI3Is the ratio difference of the current transformer, fV1、fV2、fV3Is the specific difference of the voltage transformer,I1、I2、I3is the angular difference of the current transformer,V1、V2、V3the angle difference is the angular difference of the voltage transformer, and tan phi is the tangent value of the phase difference between the voltage and the current;
solving the basic error gamma of the electric energy meter at the measuring point according to the comprehensive error calculation formula of the electric energy measuring devicecThe calculation formula is as follows:
wherein m is the number of actually measured pulses, m0Is a preset number of pulses.
5. The method of claim 1, wherein determining an error threshold E for a combined error pair table for each power meter and each group of transformers at a metering point, screening combined errors in each combined pair table that satisfy the error threshold range and determining a quantitative value for combined errors that satisfy a condition comprises:
calculating the average value of all combined errors in the electric energy meter combined error matching table of the mutual inductor and the metering point
And standard deviation σj；
Setting error threshold E to 3 sigma according to Laplace criterionj；
Selecting a satisfaction in the combined error pair table
And determining the number of the combined errors, wherein gamma is the combined error of the electric energy meter and the mutual inductor in the electric energy meter combined error matching table of the mutual inductor and the metering point.
6. The method of claim 1, wherein when the number of the determined combination errors in the combination error matching table of one electric energy meter of a metering point and a plurality of groups of mutual inductors is equal, the standard deviation of a plurality of test points in each combination error matching table with the equal number of the combination errors is calculated, and the electric energy meter is installed on the group of mutual inductors with the minimum standard deviation, and the standard deviation calculation formula is as follows:
wherein S is the standard deviation of n test points in each combined error matching table with equal combined error quantity, n is the test point quantity, and gamma isiFor the combined error at the different test points,
the average of the error sums is combined for n test points.
7. A system for matching transformers and power meters of a plant, the system comprising:
the combined error matching table determining unit is used for summing the combined error of each group of the voltage transformers and the current transformers and the basic error of each electric energy meter of the metering point one by one according to the test point to form a combined error matching table of each electric energy meter of the metering point and each group of transformers;
the error threshold value determining unit is used for determining an error threshold value E of a combined error matching table of each electric energy meter and each group of mutual inductors of the metering point, screening combined errors in each combined matching table meeting the error threshold value range and determining the quantity value of the combined errors meeting conditions, and then arranging the electric energy meters of the metering points with the quantity value of the combined errors larger than 0 in a descending order according to the quantity value of the combined errors;
and the measuring point electric energy meter determining unit is used for determining the number of the electric energy meter installed at the measuring point according to the sequencing result and appointing the installation position of the electric energy meter corresponding to the number.
8. The system of claim 7, wherein the metering points comprise settlement-type metering points and assessment-type metering points.
9. The system of claim 8, wherein the system matching the transformers and the electric energy meters of the plant comprises matching the transformers and the balance type metering point electric energy meters of the plant and matching the transformers and the assessment type metering point electric energy meters of the plant, and the matching is performed in the order of matching the transformers and the balance type metering point electric energy meters of the plant and then matching the transformers and the assessment type metering point electric energy meters of the plant.
10. The system according to claim 7, further comprising a transformer combined error determination unit and a measurement point electric energy meter basic error determination unit, wherein the transformer combined error determination unit is used for solving a combined error γ h of each group of the voltage transformer and the current transformer through a transformer verification error calculation formula:
γh＝1/3(fI1+fV1+fI2+fV2+fI3+fV3)+0.0097(I1-V1+I2-V2+I3-V3)tanφ(％)
wherein f isI1、fI2、fI3Is the ratio difference of the current transformer, fV1、fV2、fV3Is the specific difference of the voltage transformer,I1、I2、I3is the angular difference of the current transformer,V1、V2、V3the angle difference is the angular difference of the voltage transformer, and tan phi is the tangent value of the phase difference between the voltage and the current;
the basic error determining unit of the electric energy meter at the measuring point is used for solving the basic error gamma of the electric energy meter at the measuring point according to the comprehensive error calculation formula of the electric energy measuring devicecThe calculation formula is as follows:
wherein m is the number of actually measured pulses, m0Is a preset number of pulses.
11. The system of claim 7, wherein the error threshold determination unit determines an error threshold E for a combined error pair table for each power meter and each group of transformers at the metering point, screens combined errors in each combined pair table satisfying the error threshold range and determines a quantitative value for the combined errors satisfying a condition, comprising:
calculating the average value of all combined errors in the electric energy meter combined error matching table of the mutual inductor and the metering point
And standard deviation σj；
Setting error threshold E to 3 sigma according to Laplace criterionj；
Selecting a satisfaction in the combined error pair table
And determining the number of the combined errors, wherein gamma is the combined error of the electric energy meter and the mutual inductor in the electric energy meter combined error matching table of the mutual inductor and the metering point.
12. The system of claim 7, wherein in the error threshold determination unit, when the number of the determined combination errors in the combination error matching table of one power meter of the metering point and the plurality of sets of transformers is equal, the standard deviation of the plurality of test points in each combination error matching table with the equal number of combination errors is calculated, and the power meter is installed on the set of transformers with the smallest standard deviation, and the standard deviation calculation formula is as follows:
wherein S is each combined error with equal number of combined errorsMatching the standard deviation of n test points in the table, wherein n is the number of the test points and gammaiFor the combined error at the different test points,
the average of the error sums is combined for n test points.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710245718.0A CN107085195B (en) | 2017-04-14 | 2017-04-14 | Method and system for matching mutual inductor and electric energy meter of plant station |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710245718.0A CN107085195B (en) | 2017-04-14 | 2017-04-14 | Method and system for matching mutual inductor and electric energy meter of plant station |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN107085195A CN107085195A (en) | 2017-08-22 |
| CN107085195B true CN107085195B (en) | 2020-12-29 |
Family
ID=59611704
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201710245718.0A Active CN107085195B (en) | 2017-04-14 | 2017-04-14 | Method and system for matching mutual inductor and electric energy meter of plant station |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN107085195B (en) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110426669A (en) * | 2019-08-12 | 2019-11-08 | 安徽南瑞中天电力电子有限公司 | A kind of automatic screening methods of electric energy meter based on error testing |
| CN115236394A (en) * | 2022-09-22 | 2022-10-25 | 南方电网数字电网研究院有限公司 | Power transmission line carbon emission metering method and device, computer equipment and storage medium |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103852609A (en) * | 2012-11-28 | 2014-06-11 | 国家电网公司 | Metering box, ground wire hitching method of the metering box, and replacement method of current transformer of the metering box |
| CN104218570A (en) * | 2014-08-21 | 2014-12-17 | 国家电网公司 | Method and system for online evaluating overall measuring errors of electric energy measuring device |
| CN106066860A (en) * | 2016-05-24 | 2016-11-02 | 广东电网有限责任公司 | A kind of method of electric power meter management |
| CN106324547A (en) * | 2016-08-24 | 2017-01-11 | 成都思晗科技股份有限公司 | Operation state prediction method used for metering device |
-
2017
- 2017-04-14 CN CN201710245718.0A patent/CN107085195B/en active Active
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103852609A (en) * | 2012-11-28 | 2014-06-11 | 国家电网公司 | Metering box, ground wire hitching method of the metering box, and replacement method of current transformer of the metering box |
| CN104218570A (en) * | 2014-08-21 | 2014-12-17 | 国家电网公司 | Method and system for online evaluating overall measuring errors of electric energy measuring device |
| CN106066860A (en) * | 2016-05-24 | 2016-11-02 | 广东电网有限责任公司 | A kind of method of electric power meter management |
| CN106324547A (en) * | 2016-08-24 | 2017-01-11 | 成都思晗科技股份有限公司 | Operation state prediction method used for metering device |
Non-Patent Citations (1)
| Title |
|---|
| 浅谈计量互感器与电能表的匹配;黄克生;《农村电工》;20011231(第12期);第34页 * |
Also Published As
| Publication number | Publication date |
|---|---|
| CN107085195A (en) | 2017-08-22 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN108445438B (en) | Method and device for detecting wrong wiring of electric energy metering device | |
| CN102156274B (en) | Field integral detecting system of three-phase electric energy measuring system of electric distribution network | |
| Lucas et al. | Grid harmonic impact of multiple electric vehicle fast charging | |
| CN107544046B (en) | Online error measurement system and method for voltage transformer | |
| CN105356461B (en) | A kind of accounting method of the load unbalanced administration project carbon emission reduction amount of low voltage electric network | |
| CN107085195B (en) | Method and system for matching mutual inductor and electric energy meter of plant station | |
| WO2017071614A1 (en) | Method for operating energy consumption metering system and energy consumption metering system | |
| CN104502775B (en) | A kind of quantitative analysis method of quality of power supply to transformer synthesis energy consumption | |
| CN109239487A (en) | A kind of user's use energy quality evaluating method and system based on electricity consumption data | |
| CN109507630A (en) | Wiring judgment method and system | |
| CN202075405U (en) | Onsite overall detection system of three-phase electric energy metering system of distribution network | |
| CN103424622B (en) | A kind of detection of fractional harmonic source and determination methods | |
| Blanco et al. | Calculation of phase angle diversity for time-varying harmonic currents from grid measurement | |
| CN105487043A (en) | Metering accuracy simulation test system of digital electric energy meter | |
| CN103606111A (en) | Integrated voltage qualified rate evaluation method | |
| Hatziargyriou et al. | On the der hosting capacity of distribution feeders | |
| Pazderin et al. | Localization of non-technical energy losses based on the energy flow problem solution | |
| CN105403808B (en) | A kind of localization method and device of DC line earth fault | |
| CN105093162A (en) | Method and device for calibrating measurement error of electric energy meter under pulse train interference condition | |
| CN104614625B (en) | Power system active load method of testing and system | |
| CN109613465B (en) | Metering supervision method for automatic verification assembly line of low-voltage current transformer | |
| Brito et al. | Analysis of the influence of non-linear loads on the measurement and billing of electrical energy compared with the CPT | |
| CN209514036U (en) | A kind of seven disk inductive voltage divider calibrating installations | |
| CN113826018A (en) | Validating fundamental-only energy measurements | |
| CN110470903A (en) | A kind of electric voltage frequency hard measurement device and method |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |