CN109270482A - Voltage transformer accuracy of measuring on-line evaluation method and terminal device - Google Patents

Abstract

The present invention is suitable for Electric Energy Metering Technology field, provides a kind of voltage transformer accuracy of measuring on-line evaluation method and terminal device.The described method includes: obtaining the critical point data of data collection system acquisition, obtain the standard critical point data of compbined test management platform storage, determine the parameter variation tendency of the capacitance of voltage transformer, dielectric loss and corresponding line loss according to critical point data and standard critical point data, and according to capacitance, the parameter variation tendency of dielectric loss and corresponding line loss determine the accuracy of measuring of voltage transformer.After adopting the above scheme, while improving energy metering operation management level and reliability, on-line condition monitoring, fault diagnosis and the status assessment of entire metering gateway device are realized in extension, are assessed for the state-detection of energy metering, intelligent diagnostics and are provided strong support.

Description

Online evaluation method and terminal device for measuring accuracy of voltage transformer

Technical field

The invention belongs to the technical field of electric energy measurement, and particularly relates to an online evaluation method and terminal device for measuring accuracy of a voltage transformer.

Background technique

At present, according to the provisions of the verification rules of electric energy metering devices, periodic inspection methods are used for various types of metering devices. However, in the actual power supply trade settlement, the metering devices in the gateways will have problems such as metering device failure or out-of-tolerance every year. One of the important factors is Fault and out of tolerance for capacitive voltage transformers.

CVT (Continuously Variable Transmission) is widely used in voltage transformers for voltage measurement of 35kV and above. This type of voltage transformer is less prone to error than electromagnetic transformers. Out-of-tolerance phenomenon, and there is no effective means to monitor the error variation of various metering devices during the detection period. The fault or out-of-tolerance of the voltage transformer in the inspection cycle becomes one of the most important factors affecting the measurement accuracy, and because of its physical characteristics During the detection cycle, the error power is continuously expanded, which affects the fairness and accuracy of the electricity trading, and the serious situation may even threaten the safe operation of the power grid.

Summary of the invention

In view of this, the embodiment of the present invention provides an online evaluation method and a terminal device for measuring the accuracy of a voltage transformer, so as to solve the problem that the error power is continuously expanded during the detection period due to the physical characteristics of the CVT in the prior art, which affects the power transaction. Fair and accurate, serious situations may even threaten the safe operation of the grid.

A first aspect of the embodiments of the present invention provides an online evaluation method for measuring accuracy of a voltage transformer, including:

Obtaining the gate data collected by the data acquisition system;

Obtain standard gateway data stored by the comprehensive test management platform;

According to the gateway data and the standard gateway data, the change trend of the capacitance, dielectric loss and corresponding line loss of the voltage transformer is determined, and the measurement accuracy of the voltage transformer is determined according to the change trend of the capacitance, dielectric loss and corresponding line loss. .

As a further technical solution, the method further includes:

The line loss rate expression for the line loss between the metering gate of the voltage transformer and the reference point is:

r'=rf ₁ +f ₂ , where r' is the line loss rate of the acquisition system, r is the actual line loss rate of the line, f ₁ is the difference between the metering point and the voltage transformer, and f ₂ is the reference point and voltage transformer Comparison.

As a further technical solution, the voltage transformer comprises a capacitor voltage dividing unit and an electromagnetic unit, and the capacitor voltage dividing unit comprises a parallel film-membrane composite medium or a parallel full-film medium.

As a further technical solution, the influence of the insulation structure of the voltage transformer on the metering performance includes internal insulation performance, external insulation performance, and aging performance.

As a further technical solution, the method further includes:

Judging whether the measurement accuracy of the voltage transformer is qualified according to the pre-stored accuracy judgment standard;

If it is determined that the measurement accuracy of the voltage transformer is unsatisfactory, an alarm command is sent to the alarm device, and the alarm command is used to instruct the alarm device to alarm.

A second aspect of the embodiments of the present invention provides an online evaluation device for measuring accuracy of a voltage transformer, including:

a gateway data acquisition module, configured to acquire gateway data collected by the data acquisition system;

a standard gateway data acquisition module for obtaining standard gateway data stored by the comprehensive test management platform;

The measurement accuracy determining module is configured to determine the capacitance, dielectric loss and corresponding line loss parameter variation trend of the voltage transformer according to the gateway data and the standard gateway data, and according to the capacitance, dielectric loss and corresponding line loss of the voltage transformer The parametric change trend determines the measurement accuracy of the voltage transformer.

As a further technical solution, the device further includes:

The line loss rate determination module, the line loss rate expression for the line loss between the metering gate of the voltage transformer and the reference point is:

r'=rf ₁ +f ₂ , where r' is the line loss rate of the acquisition system, r is the actual line loss rate of the line, f ₁ is the difference between the metering point and the voltage transformer, and f ₂ is the reference point and voltage transformer Comparison.

As a further technical solution, the voltage transformer comprises a capacitor voltage dividing unit and an electromagnetic unit, and the capacitor voltage dividing unit comprises a parallel film-membrane composite medium or a parallel full-film medium.

A third aspect of the embodiments of the present invention provides a voltage transformer measurement accuracy online evaluation terminal device, including a memory, a processor, and a computer program stored in the memory and operable on the processor, The method as described in the first aspect above is implemented when the processor executes the computer program.

A fourth aspect of an embodiment of the present invention provides a computer readable storage medium storing a computer program that, when executed by a processor, implements the method of the first aspect described above.

Compared with the prior art, the embodiment has the beneficial effects that: after adopting the above solution, the capacitance, the dielectric loss and the corresponding line loss parameter variation trend of the voltage transformer can be determined according to the gateway data and the standard gateway data, and according to The change trend of the capacitance, dielectric loss and corresponding line loss determines the measurement accuracy of the voltage transformer, improves the level and reliability of the gate metering operation and maintenance management, and expands the entire metering device (including the energy meter, current and voltage). On-line condition monitoring, fault diagnosis and state assessment of the transformers provide strong support for state detection and intelligent diagnostic evaluation of gateway metering.

DRAWINGS

In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings used in the embodiments or the description of the prior art will be briefly described below. It is obvious that the drawings in the following description are only the present invention. For some embodiments, other drawings may be obtained from those of ordinary skill in the art without departing from the drawings.

1 is a flow chart of steps of an online evaluation method for measuring accuracy of a voltage transformer according to an embodiment of the present invention;

2 is a flow chart of steps of an online evaluation method for measuring accuracy of a voltage transformer according to another embodiment of the present invention;

3 is a schematic structural diagram of an online evaluation device for measuring accuracy of a voltage transformer according to an embodiment of the present invention;

4 is a schematic diagram of an online evaluation terminal device for measuring accuracy of a voltage transformer according to an embodiment of the present invention;

FIG. 5 is a schematic diagram of a system configuration connection according to an embodiment of the present invention; FIG.

6 is a schematic diagram of a basic electrical connection of a voltage transformer according to an embodiment of the present invention;

7 is a schematic diagram of an insulated electrical connection of a voltage transformer according to an embodiment of the present invention;

FIG. 8 is a schematic diagram of an insulated electrical connection of a voltage transformer according to another embodiment of the present invention; FIG.

FIG. 9 is a schematic diagram of an insulated electrical connection of a voltage transformer according to an embodiment of the present invention.

Detailed ways

In the following description, for purposes of illustration and description However, it will be apparent to those skilled in the art that the present invention may be practiced in other embodiments without these specific details. In other instances, detailed descriptions of well-known systems, devices, circuits, and methods are omitted so as not to obscure the description of the invention.

In order to explain the technical solution described in the present invention, the following description will be made by way of specific embodiments.

As shown in FIG. 1 , a flow chart of steps for an online evaluation method for measuring accuracy of a voltage transformer according to an embodiment of the present invention includes:

Step S101: Acquire a gateway data collected by the data collection system.

Step S102, obtaining standard gateway data stored by the comprehensive test management platform.

Step S103, determining, according to the gateway data and the standard gateway data, a change trend of the capacitance, the dielectric loss and the corresponding line loss of the voltage transformer, and determining the voltage transformer according to the change trend of the capacitance, the dielectric loss and the corresponding line loss. Measurement accuracy.

Specifically, the scheme is applicable to the correlation parameter analysis of the measurement accuracy of the capacitance measuring voltage transformer, and then realizes the remote online evaluation and early warning for the accuracy of the CVT in operation, and evaluates the early warning mechanism to replace the online real-time inspection method that is difficult to promote. Establish more than 10 kinds of internal and external factors and measurement characteristics change model, form a rich and powerful background calculation model library, the system automatically obtains real-time data and test data, automatically analyzes the comprehensive error, and gives the actual error evaluation value under standard conditions, evaluation The integrated state of the CVT gives different levels of alarms to the anomalies and automatically generates an offline production plan. This assessment system achieves the improvement of the level and operation management level and reliability of the gateway, and expands the online measurement, fault diagnosis and status assessment of the entire metering device including the energy meter and current and voltage transformers. Intelligent diagnostic assessment provides a strong support.

In addition, as shown in FIG. 5, in a specific example, the method further includes:

The line loss rate expression for the line loss between the metering gate of the voltage transformer and the reference point is:

r'=rf ₁ +f ₂ , where r' is the line loss rate of the acquisition system, r is the actual line loss rate of the line, f ₁ is the difference between the metering point and the voltage transformer, and f ₂ is the reference point and voltage transformer Comparison.

Specifically, in a specific case, from the system configuration, according to the DL/T 448-2016 "Technical Management Regulations for Electric Energy Metering Devices", the energy metering device for trade settlement should be set in principle in the property rights boundary of the power supply facility. At the same time, the power line of the power generation enterprise, the communication line between the power grid enterprises and the other end of the dedicated line power supply circuit shall be equipped with an energy metering device for assessment. The line loss between the metering gate and the reference point is generally fixed, and the line is fixed. The parameters are determined. However, when the measurement accuracy changes, the line loss rate calculated by the background data of the acquisition system will change accordingly.

In addition, in a specific example, the voltage transformer comprises a capacitor voltage dividing unit and an electromagnetic unit, and the capacitor voltage dividing unit comprises a parallel film-membrane composite medium or a parallel full-film medium, and the basic electrical schematic diagram thereof is shown in FIG. 6 . Shown.

Moreover, in a specific example, the influence of the insulation structure of the voltage transformer on the metering performance includes internal insulation performance, external insulation performance, and aging performance.

In addition, as shown in FIG. 7, FIG. 8 and FIG. 9, in a specific case, the influence of the CVT insulation structure on its metering performance mainly needs to consider the effects of internal insulation, external insulation, aging, temperature and humidity, and introduce leakage into the equipment model. The influence of current, stray capacitance, power frequency resistance and other parameters, where Zm is the excitation impedance, Zd is the damping impedance, ZL is the load impedance, C ₁ is the CVT high voltage capacitor in the dielectric parallel connection, and C ₂ is the CVT low voltage capacitor, R1 R2 represents the comprehensive insulation resistance of the equipment. C ₁ ' and C ₂ ' are high-voltage and low-voltage integrated capacitors respectively, which are considered by factors such as stray capacitance. During the operation of CVT, due to external pollution, temperature and humidity, and aging effects, external insulation resistance may decrease, capacitance leakage capacitance increases, and partial breakdown of capacitance causes capacitance to change.

For RC parallel model media, the dielectric loss is Where δ is the dielectric loss angle, and when there is no load, the relationship between output U ₀ and U _S is as follows:

among them,

For the input-output relationship diagram equivalent to the basic RC circuit, the equivalent R, C is:

For the equipment load, ignore the influence of the change, ignore the electromagnetic unit loop impedance, set the total equivalent load to ZL', and further simplify the model.

The calculation is available:

The output voltage U decreases with the increase of the low-voltage capacitor C2 and its dielectric loss ε ₂ , and increases with the increase of its high-voltage capacitor C1 and its dielectric loss ε ₁ , and the output voltage U varies with the insulation performance parameters of the device. The measurement accuracy varies with the insulation performance parameters of the equipment.

Based on the above principle, based on the cross-professional big data sharing platform, a remote online early warning system for measuring the measurement accuracy of capacitive voltage transformers is established. The evaluation module is used as the core, and the data of the acquisition system and the comprehensive test management platform are used as resources. Equipment operating conditions, analysis of CVT capacitance, dielectric loss and corresponding line loss and other parameters change trends, periodic evaluation of equipment aging conditions, predicting the degree of CVT accuracy changes.

Moreover, in a specific example, the method further includes:

In step S201, it is judged whether the measurement accuracy of the voltage transformer is qualified according to the pre-stored accuracy judgment standard.

Step S202: If it is determined that the measurement accuracy of the voltage transformer is unsatisfactory, an alarm command is sent to the alarm device, and the alarm command is used to instruct the alarm device to alarm.

FIG. 3 is a schematic structural diagram of an online evaluation device for measuring accuracy of a voltage transformer according to an embodiment of the present invention, including:

The gateway data obtaining module 301 is configured to acquire the gateway data collected by the data collection system.

The standard gateway data obtaining module 302 is configured to obtain standard gateway data stored by the comprehensive test management platform.

The measurement accuracy determining module 303 is configured to determine, according to the gateway data and the standard gateway data, a change trend of the capacitance, the dielectric loss and the corresponding line loss of the voltage transformer, and according to the capacitance, dielectric loss and corresponding line loss of the voltage transformer The parametric variation trend determines the measurement accuracy of the voltage transformer.

Moreover, in a specific example, the apparatus further includes:

The line loss rate determination module, the line loss rate expression for the line loss between the metering gate of the voltage transformer and the reference point is:

r'=rf ₁ +f ₂ , where r' is the line loss rate of the acquisition system, r is the actual line loss rate of the line, f ₁ is the difference between the metering point and the voltage transformer, and f ₂ is the reference point and voltage transformer Comparison.

Moreover, in a specific example, the voltage transformer comprises a capacitive voltage dividing unit and an electromagnetic unit, the capacitive voltage dividing unit comprising a parallel film-membrane composite medium or a parallel full-film medium.

Moreover, in a specific example, the influence of the insulation structure of the voltage transformer on the metering performance includes internal insulation performance, external insulation performance, and aging performance.

Moreover, in a specific example, the apparatus further includes:

According to the pre-stored accuracy judgment standard, it is judged whether the measurement accuracy of the voltage transformer is qualified.

If it is determined that the measurement accuracy of the voltage transformer is unsatisfactory, an alarm command is sent to the alarm device, and the alarm command is used to instruct the alarm device to alarm.

Specifically, the pre-existing accuracy judgment standard records the qualified value interval of the accuracy. If it is determined that the measurement accuracy of the voltage transformer is not within the qualified interval, it is determined that the measurement accuracy of the voltage transformer is unqualified, and the alarm command is sent to the alarm. The device reminds the staff to handle it in time. The alarm type may be one or more of a voice alarm, a vibration alarm, a buzzer alarm, or an information prompt alarm type.

In a specific case, an independent model of each gate CVT is established. With the change of the high-voltage test parameters, the degree of accuracy of the equipment is calculated and the comprehensive theoretical error is given. Based on the gateway acquisition system platform, the theoretical error of the CVT corresponding line loss data is verified, and the accuracy of the CVT is judged comprehensively, and the abnormal trend is predicted. Based on the CVT physical model under several typical environmental factors, a model relationship between the CVT primary test parameters and the secondary measurement accuracy test parameters was established. Under the big data, the multi-characteristic factor collaborative analysis, extensively explored a large number of data applications of the electricity information collection system and the comprehensive test data platform, and combined organic analysis. Multi-channel data synchronous acquisition method, CVT measurement performance online monitoring system needs to collect multiple intervals of CVT sample values in the substation to achieve synchronization of data acquisition between multiple electrical quantities, to ensure synchronization delay error is less than 10us, to ensure data synchronization Sexuality, effectiveness. Comprehensive evaluation method, based on the model and various evaluation methods, carry out comprehensive evaluation, make overall judgment on CVT measurement characteristics, method synergy, test parameter correlation and online line loss analysis are jointly evaluated, mutual verification , greatly improving the reliability of the method. A model parameter relationship between CVT high pressure test parameters and measurement accuracy was established. Cross-professional test data application mining, making full use of the characteristics of relatively short high-voltage test period, establishing the first-order and second-parameter relationship of equipment, and making up the shortcomings of long-term measurement period by online comprehensive evaluation method. The offline test data is combined with online real-time electricity data to achieve deep application of relevant data. The online evaluation of the CVT measurement performance is achieved, and the integrated error measurement in the actual state of the overall energy metering device is realized to realize the online condition monitoring, fault diagnosis and state evaluation of the entire metering device (including the energy meter, the current voltage transformer). It provides strong support for state detection and intelligent diagnosis and evaluation of gateway measurement. Compared with the current online verification mode, the invention has low input cost and has better development prospect and space in the context of big data application.

It should be understood that the size of the sequence of the steps in the above embodiments does not imply a sequence of executions, and the order of execution of the processes should be determined by its function and internal logic, and should not be construed as limiting the implementation of the embodiments of the present invention.

4 is a schematic diagram of an online evaluation terminal device for measuring the accuracy of a voltage transformer according to an embodiment of the present invention. The terminal device 4 of the embodiment includes: a processor 40, a memory 41, and a memory 41 stored in the memory 41. A computer program 42 running on processor 40, such as a voltage transformer metering accuracy online evaluation program. The processor 40, when executing the computer program 42, implements the steps in the various method embodiments described above, such as steps 101 through 103 shown in FIG. Alternatively, when the processor 40 executes the computer program 42, the functions of the modules/units in the foregoing device embodiments are implemented, such as the functions of the modules 301 to 303 shown in FIG.

Illustratively, the computer program 42 can be partitioned into one or more modules/units that are stored in the memory 41 and executed by the processor 40 to complete this invention. The one or more modules/units may be a series of computer program instruction segments capable of performing a particular function, the instruction segments being used to describe the computer program 42 in the voltage transformer metering accuracy online evaluation terminal device 4 Implementation process. For example, the computer program 42 can be divided into a synchronization module, a summary module, an acquisition module, and a return module (modules in a virtual device), and the specific functions of each module are as follows:

Obtain the gateway data collected by the data acquisition system.

Obtain standard gateway data stored by the comprehensive test management platform.

According to the gateway data and the standard gateway data, the change trend of the capacitance, dielectric loss and corresponding line loss of the voltage transformer is determined, and the measurement accuracy of the voltage transformer is determined according to the change trend of the capacitance, dielectric loss and corresponding line loss. .

The line loss rate expression for the line loss between the metering gate of the voltage transformer and the reference point is:

r'=rf ₁ +f ₂ , where r' is the line loss rate of the acquisition system, r is the actual line loss rate of the line, f ₁ is the difference between the metering point and the voltage transformer, and f ₂ is the reference point and voltage transformer Comparison.

The voltage transformer includes a capacitor voltage dividing unit and an electromagnetic unit, and the capacitor voltage dividing unit includes a parallel film-membrane composite medium or a parallel full-film medium.

The influence of the insulation structure of the voltage transformer on the metering performance includes internal insulation performance, external insulation performance, and aging performance.

According to the pre-stored accuracy judgment standard, it is judged whether the measurement accuracy of the voltage transformer is qualified.

If it is determined that the measurement accuracy of the voltage transformer is unsatisfactory, an alarm command is sent to the alarm device, and the alarm command is used to instruct the alarm device to alarm.

The voltage transformer measurement accuracy online evaluation terminal device 4 may be a computing device such as a desktop computer, a notebook, a palmtop computer, and a cloud server. The voltage transformer measurement accuracy online evaluation terminal device may include, but is not limited to, the processor 40 and the memory 41. It can be understood by those skilled in the art that FIG. 4 is only an example of the voltage transformer measurement accuracy online evaluation terminal device 4, and does not constitute a limitation of the voltage transformer measurement accuracy online evaluation terminal device 4, and may include more than the illustration. Or fewer components, or a combination of certain components, or different components, such as the voltage transformer metering accuracy, the online rating terminal device may also include input and output devices, network access devices, buses, and the like.

The processor 40 may be a central processing unit (CPU), or may be other general-purpose processors, a digital signal processor (DSP), an application specific integrated circuit (ASIC), Field-Programmable Gate Array (FPGA) or other programmable logic device, discrete gate or transistor logic device, discrete hardware components, etc. The general purpose processor may be a microprocessor or the processor or any conventional processor or the like.

The memory 41 may be an internal storage unit of the voltage transformer measurement accuracy online evaluation terminal device 4, for example, a voltage transformer measurement accuracy online evaluation terminal device 4 hard disk or memory. The memory 41 may also be an external storage device of the voltage transformer measurement accuracy online evaluation terminal device 4, for example, the voltage transformer measurement accuracy online evaluation terminal device 4 is equipped with a plug-in hard disk, a smart memory card (Smart Media Card, SMC), Secure Digital (SD) card, Flash Card, etc. Further, the memory 41 may further include the voltage transformer measurement accuracy, the internal storage unit of the terminal device 4 and the external storage device. The memory 41 is configured to store the computer program and the voltage transformer measurement accuracy to evaluate other programs and data required by the terminal device online. The memory 41 can also be used to temporarily store data that has been output or is about to be output.

It will be clearly understood by those skilled in the art that, for convenience and brevity of description, only the division of each functional unit and module described above is exemplified. In practical applications, the above functions may be assigned to different functional units according to needs. The module is completed by dividing the internal structure of the device into different functional units or modules to perform all or part of the functions described above. Each functional unit and module in the embodiment may be integrated into one processing unit, or each unit may exist physically separately, or two or more units may be integrated into one unit, and the integrated unit may be implemented by hardware. Formal implementation can also be implemented in the form of software functional units. In addition, the specific names of the respective functional units and modules are only for the purpose of facilitating mutual differentiation, and are not intended to limit the scope of protection of the present application. For the specific working process of the unit and the module in the foregoing system, reference may be made to the corresponding process in the foregoing method embodiment, and details are not described herein again.

In the above embodiments, the descriptions of the various embodiments are different, and the parts that are not detailed or described in the specific embodiments may be referred to the related descriptions of other embodiments.

Those of ordinary skill in the art will appreciate that the elements and algorithm steps of the various examples described in connection with the embodiments disclosed herein can be implemented in electronic hardware or a combination of computer software and electronic hardware. Whether these functions are performed in hardware or software depends on the specific application and design constraints of the solution. A person skilled in the art can use different methods for implementing the described functions for each particular application, but such implementation should not be considered to be beyond the scope of the present invention.

In the embodiments provided by the present invention, it should be understood that the disclosed apparatus/terminal device and method may be implemented in other manners. For example, the device/terminal device embodiments described above are merely illustrative. For example, the division of the modules or units is only a logical function division. In actual implementation, there may be another division manner, for example, multiple units. Or components may be combined or integrated into another system, or some features may be omitted or not performed. In addition, the mutual coupling or direct coupling or communication connection shown or discussed may be an indirect coupling or communication connection through some interface, device or unit, and may be in electrical, mechanical or other form.

The units described as separate components may or may not be physically separated, and the components displayed as units may or may not be physical units, that is, may be located in one place, or may be distributed to multiple network units. Some or all of the units may be selected according to actual needs to achieve the purpose of the solution of the embodiment.

In addition, each functional unit in each embodiment of the present invention may be integrated into one processing unit, or each unit may exist physically separately, or two or more units may be integrated into one unit. The above integrated unit can be implemented in the form of hardware or in the form of a software functional unit.

The integrated modules/units, if implemented in the form of software functional units and sold or used as separate products, may be stored in a computer readable storage medium. Based on such understanding, the present invention implements all or part of the processes in the foregoing embodiments, and may also be completed by a computer program to instruct related hardware. The computer program may be stored in a computer readable storage medium. The steps of the various method embodiments described above may be implemented when the program is executed by the processor. Wherein, the computer program comprises computer program code, which may be in the form of source code, object code form, executable file or some intermediate form. The computer readable medium may include any entity or device capable of carrying the computer program code, a recording medium, a USB flash drive, a removable hard disk, a magnetic disk, an optical disk, a computer memory, a read-only memory (ROM). , random access memory (RAM, Random Access Memory), electrical carrier signals, telecommunications signals, and software distribution media. It should be noted that the content contained in the computer readable medium may be appropriately increased or decreased according to the requirements of legislation and patent practice in a jurisdiction, for example, in some jurisdictions, according to legislation and patent practice, computer readable media It does not include electrical carrier signals and telecommunication signals.

The embodiments described above are only for explaining the technical solutions of the present invention, and are not intended to be limiting; although the present invention has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art will understand that The technical solutions described in the examples are modified, or some of the technical features are equivalently replaced; and the modifications or substitutions do not deviate from the spirit and scope of the technical solutions of the embodiments of the present invention, and should be included in Within the scope of protection of the present invention.

Claims (10)

1. A voltage transformer metering accuracy online evaluation method is characterized by comprising the following steps:

acquiring gateway data acquired by a data acquisition system;

acquiring standard gateway data stored by a comprehensive test management platform;

and determining the capacitance, the dielectric loss and the parameter variation trend of the corresponding line loss of the voltage transformer according to the gateway data and the standard gateway data, and determining the metering accuracy of the voltage transformer according to the capacitance, the dielectric loss and the parameter variation trend of the corresponding line loss.

2. The online evaluation method for the metering accuracy of the voltage transformer according to claim 1, further comprising:

the line loss rate expression of the line loss between the metering gateway of the voltage transformer and the reference point is as follows:

r'＝r-f₁+f₂wherein r' is the line loss rate displayed by the acquisition system, r is the actual line loss rate of the line, f₁Is the ratio difference between the measuring point and the voltage transformer, f₂Is the ratio difference between the reference point and the voltage transformer.

3. The online evaluation method for the metering accuracy of the voltage transformer according to claim 1, wherein the voltage transformer comprises a capacitance voltage division unit and an electromagnetic unit, and the capacitance voltage division unit comprises parallel membrane-paper composite media or parallel full-membrane media.

4. The online evaluation method for the metering accuracy of the voltage transformer according to claim 1, wherein the influence of the insulation structure of the voltage transformer on the metering performance comprises inner insulation performance, outer insulation performance and aging performance.

5. The online evaluation method for the metering accuracy of the voltage transformer according to claim 1, further comprising:

judging whether the metering accuracy of the voltage transformer is qualified or not according to a prestored accuracy judgment standard;

and if the metering accuracy of the voltage transformer is judged to be unqualified, sending an alarm instruction to an alarm device, wherein the alarm instruction is used for indicating the alarm device to alarm.

6. The utility model provides a voltage transformer measurement accuracy online evaluation device which characterized in that includes:

the gateway data acquisition module is used for acquiring gateway data acquired by the data acquisition system;

the standard gateway data acquisition module is used for acquiring standard gateway data stored by the comprehensive test management platform;

and the measurement accuracy determining module is used for determining the capacitance, the dielectric loss and the parameter change trend of the corresponding line loss of the voltage transformer according to the gateway data and the standard gateway data, and determining the measurement accuracy of the voltage transformer according to the capacitance, the dielectric loss and the parameter change trend of the corresponding line loss of the voltage transformer.

7. The on-line evaluation device for the metering accuracy of the voltage transformer as recited in claim 6, further comprising:

and the line loss rate determining module is used for expressing the line loss rate of the line loss between the metering gateway of the voltage transformer and the reference point as follows:

r'＝r-f₁+f₂wherein r' is the line loss rate displayed by the acquisition system, r is the actual line loss rate of the line, f₁Is the ratio difference between the measuring point and the voltage transformer, f₂Is the ratio difference between the reference point and the voltage transformer.

8. The on-line evaluation device for the metering accuracy of the voltage transformer as claimed in claim 6, wherein the voltage transformer comprises a capacitance voltage division unit and an electromagnetic unit, and the capacitance voltage division unit comprises parallel membrane paper composite media or parallel full-membrane media.

9. Terminal equipment for online evaluation of the metering accuracy of a voltage transformer, comprising a memory, a processor and a computer program stored in the memory and executable on the processor, characterized in that the processor implements the steps of the method according to any one of claims 1 to 5 when executing the computer program.

10. A computer-readable storage medium, in which a computer program is stored which, when being executed by a processor, carries out the steps of the method according to any one of claims 1 to 5.