CN110764040B - Method and system for determining error measurement function of automatic verification system - Google Patents
Method and system for determining error measurement function of automatic verification system Download PDFInfo
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- CN110764040B CN110764040B CN201911005575.1A CN201911005575A CN110764040B CN 110764040 B CN110764040 B CN 110764040B CN 201911005575 A CN201911005575 A CN 201911005575A CN 110764040 B CN110764040 B CN 110764040B
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- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R35/00—Testing or calibrating of apparatus covered by the other groups of this subclass
- G01R35/02—Testing or calibrating of apparatus covered by the other groups of this subclass of auxiliary devices, e.g. of instrument transformers according to prescribed transformation ratio, phase angle, or wattage rating
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Abstract
The invention discloses a method and a system for determining an error measurement function of an automatic verification system, and belongs to the technical field of electrical measurement. The method comprises the following steps: using a high-grade standard and an automatic verification system to perform m groups of measurements on the low-voltage current transformer verification standard, repeatedly measuring n data in each group, and acquiring a sample data mean value, a subgroup coefficient and measurement uncertainty; automatically calibrating a system operation control chart according to the sample data mean value, the subgroup coefficient and the measurement uncertainty; and controlling the automatic verification system to verify the low-voltage current transformer to obtain test data, and determining that the error measurement function of the automatic verification system is qualified if the test data falls into an operation control chart of the automatic verification system. The invention uses the quality control chart of the checking standard and the control chart of the running state of the production line to visually record whether the measuring process of the production line is in the statistical control state or not, so that the running state of the automatic verification system is always under controlled supervision.
Description
Technical Field
The present invention relates to the field of electrical measurement technology, and more particularly, to a method and system for determining an error measurement function of an automated verification system.
Background
The low-voltage current transformer is used for measuring electric energy in a 0.4kV distribution line. In order to ensure the fairness and justice of electric energy trade settlement, the low-voltage current transformer can be installed and put into operation on site only after being qualified through verification. With the rapid development of economy in China, the demand of each area on electric power is increasing day by day, and the usage amount of the low-voltage current transformer for metering is synchronously and rapidly increased. The traditional manual mode is used for detecting the low-voltage current transformer, the working efficiency is low, the operation cost is high, and the consistency of the detection standard and the detection result is difficult to ensure.
Specific check standards are developed for the production line, the production line is verified as normal samples, the metering performance of the production line is reflected according to verification data and control charts of the production line, the measuring process of the production line is always in a controlled state, and powerful data support is provided for metering supervision work. While the control chart methods were originally established for industrial production and development applications, control chart methods are now widely used in a wide range of services and ancillary activities. Its primary purpose is to provide a means to assess whether a production run or management process is in a "statistical control state". While the control chart methods were originally established for industrial production and development applications, control chart methods are now widely used in a wide range of services and ancillary activities.
Disclosure of Invention
In view of the above problems, the present invention provides a method for determining an error measurement function of an automated verification system, comprising:
using a high-grade standard and an automatic verification system to perform m groups of measurements on the low-voltage current transformer verification standard, repeatedly measuring n data in each group, and acquiring a sample data mean value, a subgroup coefficient and measurement uncertainty;
m and n are greater than or equal to 6;
automatically calibrating a system operation control chart according to the sample data mean value, the subgroup coefficient and the measurement uncertainty;
and controlling the automatic verification system to verify the low-voltage current transformer to obtain test data, and determining that the error measurement function of the automatic verification system is qualified if the test data falls into an operation control chart of the automatic verification system.
Optionally, the method further comprises:
if the test data does not fall into the operation control chart of the automatic verification system, acquiring a verification standard quality control chart according to the sample data mean value, the subgroup coefficient and the measurement uncertainty;
determining whether a low-voltage current transformer checking standard fault exists or not according to the measurement data and a checking standard quality control chart;
and if the low-voltage current transformer check standard has no fault, determining that the error measurement function of the automatic verification system is unqualified.
Optionally, checking the standard quality control chart comprises: control map center line, control upper and lower limits, and control range.
The present invention also provides a system for determining an error measurement function of an automated verification system, comprising:
the parameter acquisition module is used for performing m groups of measurement on the low-voltage current transformer check standard by using a high-grade standard and an automatic verification system, wherein each group repeatedly measures n data to acquire a sample data mean value, a subgroup coefficient and measurement uncertainty;
m and n are greater than or equal to 6;
the model building module is used for automatically verifying the operation control chart of the system according to the sample data mean value, the subgroup coefficient and the measurement uncertainty;
and the checking module is used for controlling the automatic verification system to check the low-voltage current transformer to obtain test data, and if the test data falls into an operation control chart of the automatic verification system, the error measurement function of the automatic verification system is determined to be qualified.
Optionally, the verification module is configured to determine that the test data does not fall into an operation control chart of the automatic verification system, and obtain a verification standard quality control chart according to a sample data mean value, a subgroup coefficient and a measurement uncertainty;
determining whether a low-voltage current transformer checking standard fault exists or not according to the measurement data and a checking standard quality control chart;
and if the low-voltage current transformer check standard has no fault, determining that the error measurement function of the automatic verification system is unqualified.
Optionally, checking the standard quality control chart comprises: control map center line, control upper and lower limits, and control range.
The invention uses the quality control chart of the checking standard and the control chart of the running state of the production line to visually record whether the measuring process of the production line is in the statistical control state or not, so that the running state of the automatic verification system is always under controlled supervision, and corresponding measures are taken in time to ensure the accurate and reliable verification result of the measuring instrument.
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FIG. 1 is a flow chart of a method for determining an error measurement function of an automated verification system in accordance with the present invention;
fig. 2 is a block diagram of a system for determining an error measurement function of an automated certification system in accordance with 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.
The control chart is a graphical record of whether the measurement process is under statistical control. It can judge and provide the information of whether there is abnormal factor in the measuring process, in order to find out the cause of the abnormality and take measures. The automatic verification assembly line can adopt a control chart to carry out long-term statistical control on the measurement process of the automatic verification assembly line.
X0+Aσ0The control diagram model is a relatively perfect measuring process control method.
The method utilizes the checking standard to control the working standard and the conditions of the whole laboratory, and is characterized in that the long-term drift and the short-term dispersity are simultaneously controlled, and the specific method comprises the following steps:
and m groups of measurement are carried out on the check standard by using a high-grade standard, and each group repeatedly measures n data. For ease of control and uncertainty assessment, it is common to take the same value for each group of n. When enough time is available for n to be greater than 6 (preferably n is greater than 10), where n is 10, then m is 10 sets of measurements, for a total of 100 sample data.
X0: a mean value of the sample data; a: a subgroup coefficient; sigma0: measuring uncertainty;
control chart center line is X0The upper control limit UCL is: x0+Aσ0And the lower control limit LCL is as follows: x0-Aσ0If the control limit is out of control, otherwise, if the control limit is in control, the control line range is equally divided into 6 zones, namely a good state zone, a normal zone and a warning zone.
The invention provides a method for determining an error measurement function of an automatic verification system, as shown in fig. 1, comprising:
using a high-grade standard and an automatic verification system to perform m groups of measurements on the low-voltage current transformer verification standard, repeatedly measuring n data in each group, and acquiring a sample data mean value, a subgroup coefficient and measurement uncertainty;
m and n are greater than or equal to 6;
automatically calibrating a system operation control chart according to the sample data mean value, the subgroup coefficient and the measurement uncertainty;
X0: a mean value of the sample data; a: a subgroup coefficient; sigma0: measuring uncertainty;
control chart center line is X0The upper control limit UCL is: x0+Aσ0And the lower control limit LCL is as follows: x0-Aσ0If the control limit is out of control, otherwise, if the control limit is in control, the control line range is equally divided into 6 zones, namely a good state zone, a normal zone and a warning zone.
And controlling the automatic verification system to verify the low-voltage current transformer to obtain test data, and determining that the error measurement function of the automatic verification system is qualified if the test data falls into an operation control chart of the automatic verification system.
If the test data does not fall into the operation control chart of the automatic verification system, obtaining a verification standard quality control chart according to the sample data mean value, the subgroup coefficient and the measurement uncertainty, wherein the verification standard quality control chart comprises the following steps: control map center line, control upper and lower limits, and control range.
Determining whether a low-voltage current transformer checking standard fault exists or not according to the measurement data and a checking standard quality control chart;
and if the low-voltage current transformer check standard has no fault, determining that the error measurement function of the automatic verification system is unqualified.
Taking the data measured by the standard laboratory and the measuring center repeatedly for a plurality of times as an example, the control chart established in the standard laboratory is called a quality control chart for the standard, and the control chart established in the measuring center is called a pipeline running state control chart. Based on the control diagram model, the ratio difference and the phase difference of the measurement results are used as control quantities, and a control diagram is established according to a mode given by a standard value in GBT4091-2001 conventional control diagram by combining the measurement uncertainty of a standard laboratory and a measurement center aiming at the verification project of the current transformer;
for example: selecting 150A/5A, 0.05S grade 12 low-voltage current transformer checking standards as an example, testing the specific value difference and the phase difference of the low-voltage current transformers under the rated current ratios of 1%, 5%, 20%, 100% and 120%, respectively testing data in a current reference laboratory of a national high-voltage metering station and a metering center assembly line of Hubei province, respectively testing 10 groups of the checking standards in the national high-voltage metering station, testing 10 times in each group, and taking the average value of 100 data as a measured value X at an interval of one month, wherein the average value of the 100 data is taken as the measured value X0The subgroup coefficient a is 0.949, the difference in the ratio of the high-voltage metering station laboratory is spread by uncertainty: uf1 ═ 0.0014, phase difference spread uncertainty: u δ 1 is 0.045, so the contrast difference σ is addressed00.0014, phase difference σ0And (3) establishing a quality control chart for checking the standard ratio difference and the phase difference, wherein the quality control chart is 0.045.
The present invention also provides a system 200 for determining an automated certification system error measurement function, as shown in fig. 2, comprising:
the parameter acquisition module 201 is used for performing m groups of measurement on the low-voltage current transformer check standard by using a high-grade standard and an automatic verification system, wherein each group repeatedly measures n data, and acquires a sample data mean value, a subgroup coefficient and measurement uncertainty;
m and n are greater than or equal to 6;
the model establishing module 202 is used for automatically verifying the operation control chart of the system according to the sample data mean value, the subgroup coefficient and the measurement uncertainty;
and the checking module 203 controls the automatic verification system to check the low-voltage current transformer, obtains test data, and determines that the error measurement function of the automatic verification system is qualified if the test data falls into the operation control chart of the automatic verification system.
The checking module is used for determining that the test data does not fall into the operation control chart of the automatic verification system and acquiring a quality control chart of the checking standard according to the sample data mean value, the subgroup coefficient and the measurement uncertainty;
determining whether a low-voltage current transformer checking standard fault exists or not according to the measurement data and a checking standard quality control chart;
and if the low-voltage current transformer check standard has no fault, determining that the error measurement function of the automatic verification system is unqualified.
Checking a standard quality control chart, comprising: control map center line, control upper and lower limits, and control range.
The invention uses the quality control chart of the checking standard and the control chart of the running state of the production line to visually record whether the measuring process of the production line is in the statistical control state or not, so that the running state of the automatic verification system is always under controlled supervision, and corresponding measures are taken in time to ensure the accurate and reliable verification result of the measuring instrument.
As will be appreciated by one skilled in the art, embodiments of the present application may be provided as a method, system, or computer program product. Accordingly, the present application may take the form of an entirely hardware embodiment, an entirely software embodiment or an embodiment combining software and hardware aspects. Furthermore, the present application may take the form of a computer program product embodied on one or more computer-usable storage media (including, but not limited to, disk storage, CD-ROM, optical storage, and the like) having computer-usable program code embodied therein.
The present application is described with reference to flowchart illustrations and/or block diagrams of methods, apparatus (systems), and computer program products according to embodiments of the application. It will be understood that each flow and/or block of the flow diagrams and/or block diagrams, and combinations of flows and/or blocks in the flow diagrams and/or block diagrams, can be implemented by computer program instructions. These computer program instructions may be provided to a processor of a general purpose computer, special purpose computer, embedded processor, or other programmable data processing apparatus to produce a machine, such that the instructions, which execute via the processor of the computer or other programmable data processing apparatus, create means for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
These computer program instructions may also be stored in a computer-readable memory that can direct a computer or other programmable data processing apparatus to function in a particular manner, such that the instructions stored in the computer-readable memory produce an article of manufacture including instruction means which implement the function specified in the flowchart flow or flows and/or block diagram block or blocks.
These computer program instructions may also be loaded onto a computer or other programmable data processing apparatus to cause a series of operational steps to be performed on the computer or other programmable apparatus to produce a computer implemented process such that the instructions which execute on the computer or other programmable apparatus provide steps for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
Finally, it should be noted that: the above embodiments are only for illustrating the technical solutions of the present invention and not for limiting the same, and although the present invention is described in detail with reference to the above embodiments, those of ordinary skill in the art should understand that: modifications and equivalents may be made to the embodiments of the invention without departing from the spirit and scope of the invention, which is to be covered by the claims.
Claims (4)
1. A method for determining an automated certification system error measurement function, the method comprising:
using a high-grade standard and an automatic verification system to perform m groups of measurements on the low-voltage current transformer verification standard, repeatedly measuring n data in each group, and acquiring a sample data mean value, a subgroup coefficient and measurement uncertainty;
m and n are greater than or equal to 6;
acquiring an operation control chart of the automatic verification system according to the sample data mean value, the subgroup coefficient and the measurement uncertainty;
controlling an automatic verification system to verify the low-voltage current transformer, acquiring test data, and determining that the error measurement function of the automatic verification system is qualified if the test data falls into an operation control chart of the automatic verification system;
if the test data does not fall into the operation control chart of the automatic verification system, acquiring a verification standard quality control chart according to the sample data mean value, the subgroup coefficient and the measurement uncertainty;
determining whether a low-voltage current transformer checking standard fault exists or not according to the measurement data and a checking standard quality control chart;
and if the low-voltage current transformer check standard has no fault, determining that the error measurement function of the automatic verification system is unqualified.
2. The method of claim 1, wherein said checking quality of standard control charts comprises: control map center line, control upper and lower limits, and control range.
3. A system for determining automated certification system error measurement functionality, the system comprising:
the parameter acquisition module is used for performing m groups of measurement on the low-voltage current transformer check standard by using a high-grade standard and an automatic verification system, wherein each group repeatedly measures n data to acquire a sample data mean value, a subgroup coefficient and measurement uncertainty;
m and n are greater than or equal to 6;
the model building module is used for obtaining an operation control chart of the automatic verification system according to the sample data mean value, the subgroup coefficient and the measurement uncertainty;
the checking module is used for controlling the automatic verification system to check the low-voltage current transformer to obtain test data, and if the test data falls into an operation control chart of the automatic verification system, the error measurement function of the automatic verification system is determined to be qualified;
determining that the test data does not fall into an operation control chart of the automatic verification system, and acquiring a quality control chart for checking the standard according to the sample data mean value, the subgroup coefficient and the measurement uncertainty;
determining whether a low-voltage current transformer checking standard fault exists or not according to the measurement data and a checking standard quality control chart;
and if the low-voltage current transformer check standard has no fault, determining that the error measurement function of the automatic verification system is unqualified.
4. The system of claim 3, wherein said verification of quality of standard control charts comprises: control map center line, control upper and lower limits, and control range.
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| US6424876B1 (en) * | 1999-07-22 | 2002-07-23 | Advanced Micro Devices, Inc. | Statistical process control system with normalized control charting |
| CN201804097U (en) * | 2010-07-06 | 2011-04-20 | 张德军 | High voltage electric energy metering device with on-line checking and testing standard |
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