Distribution transformer terminal operation data checking system

Abstract

The invention discloses a distribution transformer terminal operation data checking system, which comprises a handheld shell, a checking system module is arranged in the shell, the checking system module is connected with a transformer monitoring system module, and the transformer monitoring system module is connected with a transformer; the transformer monitoring system module comprises a data acquisition module, a data processing module, a data communication module, a data storage module and an interface module; the checking system module comprises a data receiving module, a data processing module, a data analysis module, a master control module, a result output module, a data display module and a key input module; according to the invention, the database is established based on the transformer operation data measured in real time by the real-time acquisition module, and the data is pre-stored, so that operation and maintenance personnel can connect the storage module on site to quickly read the real-time data and carry out curve fitting analysis and calculation to obtain the transformer operation characteristics meeting the actual condition, quickly master the current operation condition, and improve the operation efficiency. And the labor is saved.

Description

Technical Field

[0001] The invention belongs to the technical field of transformer operation, and in particular relates to a distribution transformer terminal operation data verification system. Background Art

[0002] In the power system, transformers are widely used electrical equipment. From power generation and supply to power consumption, they usually need to go through 3-5 transformation processes. The transformer itself needs to generate power loss during operation. According to statistics, the power loss of the transformer accounts for about 30% of the total power loss. Especially when the system is lightly loaded, the loss of the transformer is the main load, which has a great impact on network loss, voltage quality, etc. Therefore, it is necessary to reasonably arrange the operation mode of the transformer to achieve the purpose of economic operation.

[0003] Due to the large number of transformer models, long operation time, equipment aging and frequent maintenance, the actual parameters are quite different from the parameters given on the nameplate. The economic operation mode calculated according to the nameplate parameters is not necessarily the optimal mode. Only by accurately grasping the power load loss characteristics of the transformer can the economic operation area of ​​the transformer be determined. At the same time, the rapid grasp of the actual operating conditions of the transformer is also conducive to the operation and maintenance personnel to timely understand the current status, quickly make operation and maintenance plans, and maintain the stability of the power system.

[0004] However, in the prior art, the calibration method for transformer parameters is mostly to collect and upload the data to the main station monitoring system for unified analysis and processing. This is not targeted and not flexible enough. It is not convenient for operation and maintenance personnel to quickly grasp the current status of the transformer on site, and it is not convenient to use.

[0005] Therefore, in order to solve the above problems, it is necessary to develop a distribution transformer terminal operation data verification system. Summary of the invention

[0006] The purpose of the present invention is to overcome the shortcomings of the prior art and to provide a distribution transformer terminal operation data verification system. A database is established based on the transformer operation data measured in real time by a real-time acquisition module, and the data is pre-stored, so that operation and maintenance personnel can connect to the storage module on-site to quickly read the real-time data, and perform curve fitting analysis and calculation to obtain the transformer operation characteristics that meet the actual situation, quickly grasp the current operating status, and be efficient, convenient and labor-saving.

[0007] The object of the present invention is achieved as follows: a distribution transformer terminal operation data verification system, comprising a handheld housing, a verification system module is arranged inside the housing, the verification system module is connected to a transformer monitoring system module through an interface on the housing, and the transformer monitoring system module is connected to the transformer;

[0008] Wherein, the transformer monitoring system module includes a data acquisition module, a data processing module, a data communication module, a data storage module and an interface module. The data acquisition module is connected to the transformer and collects the real-time operation data of the transformer. The data processing module processes the collected real-time operation data of the transformer and connects to the main station through the data communication module. The data storage module stores the collected real-time operation data of the transformer and establishes a database. The data storage module is connected to the verification system module through the interface module.

[0009] The verification system module includes a data receiving module, the data receiving module is connected to a data processing module, the data processing module is connected to a data analysis module, the data analysis module is connected to a master control module, the master control module is connected to a result output module, a data display module and a key input module, the data receiving module is connected to the data storage module of the transformer monitoring system module through an interface module and receives the real-time operation data of the transformer in the database, the data processing module filters and modulates the received real-time operation data of the transformer and sends it to the data analysis module, the data analysis module calculates and verifies the transformer parameters and the power loss curve by using the least squares method for curve fitting, and obtains the transformer operation characteristics that conform to the actual situation, and the master control module outputs and displays the verification results and the power loss curve through the result output module and the data display module.

[0010] Furthermore, the real-time operation data of the transformer collected by the data collection module includes active power P1 and P2 on the primary and secondary sides of the transformer, and reactive power Q1 and Q2.

[0011] Furthermore, the data acquisition module collects and records the collected real-time operation data of the transformer at one point per minute.

[0012] Furthermore, the transformer parameters checked in the data analysis module include no-load current I0%, no-load loss P0, short-circuit voltage U k %, short circuit loss P k .

[0013] Furthermore, the no-load loss P0 and the short-circuit loss P k The solution is:

[0014] The corresponding load factor β is obtained according to the following formula:

[0015]

[0016] In the formula, P2 is the active power on the secondary side, Q2 is the reactive power on the secondary side, S e is the transformer capacity; then the active power loss ΔP is: ΔP=P0+β 2P k ;

[0017] According to the collected data, the primary and secondary active powers P1 and P2, the active power loss ΔP can be obtained as: ΔP = P1-P2, and then the corresponding table of active power loss ΔP and load rate β can be obtained. The least squares method is used for curve fitting to obtain the verified active power loss ΔP = f(β) curve. For the verified curve ΔP = f(β), when β is 0, the no-load loss P0 is obtained, and when β is 1, the short-circuit loss P is obtained. k =ΔP-P0.

[0018] Furthermore, the no-load current I0% and the short-circuit voltage U k The solution of % is:

[0019] The corresponding load factor β is obtained according to the following formula:

[0020]

[0021] In the formula, P2 is the active power on the secondary side, Q2 is the reactive power on the secondary side, S e is the transformer capacity; then the reactive power loss ΔQ is: ΔQ=Q0+β 2 Q k ,

[0022] According to the collected data, the reactive power Q1 and Q2 on the primary and secondary sides can be used to obtain the reactive power loss ΔQ: ΔQ = Q1-Q2, and then the corresponding table of reactive power loss ΔQ and load rate β can be obtained. The least squares method is used for curve fitting to obtain the verified active power loss ΔQ = f(β) curve. For the verified curve ΔQ = f(β), when β is 0, the no-load excitation power Q0 is obtained, and when β is 1, the rated load excitation power Q is obtained. k =ΔQ-Q0, then the no-load excitation power Q0 and the rated load excitation power Q k Substitute into the following formulas respectively:

[0023] Q0=I0%S e ×10 -2

[0024] Q k =U k %S e ×10 -2

[0025] Obtain no-load current I0% and short-circuit voltage U k %.

[0026] Furthermore, the result output module is used to output the error rate between the actual parameter and the nameplate value.

[0027] Furthermore, the data display module is used to display an active power loss characteristic curve diagram and a reactive power loss characteristic curve diagram, wherein the horizontal axis is the load rate and the vertical axis is the active power loss or reactive power loss.

[0028] Due to the adoption of the above technical scheme, the beneficial effects of the present invention are as follows: a database is established based on the transformer operation data measured in real time by the real-time acquisition module, and the data is pre-stored, so that the operation and maintenance personnel can connect the storage module through the interface module on site and quickly read the real-time data, use the least squares method to perform curve fitting analysis and calculation, check the transformer parameters and power loss load curve, obtain the transformer operation characteristics that meet the actual situation, quickly grasp the current operation status, and save efficiency, convenience and labor. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] Figure 1 It is a structural schematic diagram of the present invention.

[0030] Figure 2 It is a principle block diagram of the present invention.

[0031] In the figure: 0, housing 1, calibration system module 2, transformer monitoring system module;

[0032] 21. Data acquisition module 22. Data processing module 23. Data communication module 24. Data storage module 25. Interface module;

[0033] 11. Data receiving module 12. Data processing module 13. Data analysis module 14. General control module 15. Result output module 16. Data display module 17. Key input module. DETAILED DESCRIPTION

[0034] The technical solution of the present invention is further specifically described below through embodiments and in conjunction with the accompanying drawings.

[0035] like Figure 1 , Figure 2 As shown, a distribution transformer terminal operation data verification system includes a handheld shell 0, a verification system module 1 is arranged inside the shell 0, the verification system module 1 is connected to the transformer monitoring system module 2 through an interface on the shell 0, and the transformer monitoring system module 2 is connected to the transformer.

[0036] Among them, the transformer monitoring system module 2 includes a data acquisition module 21, a data processing module 22, a data communication module 23, a data storage module 24 and an interface module 25. The data acquisition module 21 is connected to the transformer and collects the real-time operation data of the transformer. The data processing module 22 processes the collected real-time operation data of the transformer and is connected to the main station through the data communication module 23. The data storage module 24 stores the collected real-time operation data of the transformer and establishes a database. The data storage module 24 is connected to the verification system module 1 through the interface module 25.

[0037] Among them, the verification system module 1 includes a data receiving module 11, the data receiving module 11 is connected to a data processing module 12, the data processing module 12 is connected to a data analysis module 13, the data analysis module 13 is connected to a master control module 14, the master control module 14 is connected to a result output module 15, a data display module 16 and a key input module 17, the data receiving module 11 is connected to the data storage module 24 of the transformer monitoring system module 2 through an interface module 25 and receives the real-time operation data of the transformer in the database, the data processing module 12 filters and modulates the received real-time operation data of the transformer and sends it to the data analysis module 13, the data analysis module 13 calculates and verifies the transformer parameters and the power loss curve by using the least squares method for curve fitting, and obtains the transformer operation characteristics that conform to the actual situation, and the master control module 14 outputs and displays the verification results and the power loss curve through the result output module 15 and the data display module 16.

[0038] Specifically, the real-time transformer operation data collected by the data collection module 21 includes active power P1 and P2 on the primary side and secondary side of the transformer, and reactive power Q1 and Q2.

[0039] Specifically, the data acquisition module 21 collects and records the collected real-time operation data of the transformer at one point per minute.

[0040] Specifically, the transformer parameters checked in the data analysis module 13 include no-load current I0%, no-load loss P0, short-circuit voltage U k %, short circuit loss P k .

[0041] The no-load loss P0 and short-circuit loss P k The solution is: According to the following formula, the corresponding load rate β is obtained:

[0042]

[0043] In the formula, P2 is the active power on the secondary side, Q2 is the reactive power on the secondary side, Se is the transformer capacity; then the active power loss ΔP is: ΔP=P0+β 2 P k ;

[0044] According to the collected data, the primary and secondary active powers P1 and P2, the active power loss ΔP can be obtained as: ΔP = P1-P2, and then the corresponding table of active power loss ΔP and load rate β can be obtained. The least squares method is used for curve fitting to obtain the verified active power loss ΔP = f(β) curve. For the verified curve ΔP = f(β), when β is 0, the no-load loss P0 is obtained, and when β is 1, the short-circuit loss P is obtained. k =ΔP-P0.

[0045] Specifically, the no-load current I0% and the short-circuit voltage U k The solution of % is: According to the following formula, the corresponding load rate β is obtained.

[0046]

[0047] In the formula, P2 is the active power on the secondary side, Q2 is the reactive power on the secondary side, S e is the transformer capacity; then the reactive power loss ΔQ is: ΔQ=Q0+β 2 Q k ,

[0048] According to the collected data, the reactive power Q1 and Q2 on the primary and secondary sides can be used to obtain the reactive power loss ΔQ: ΔQ = Q1-Q2, and then the corresponding table of reactive power loss ΔQ and load rate β can be obtained. The least squares method is used for curve fitting to obtain the verified active power loss ΔQ = f(β) curve. For the verified curve ΔQ = f(β), when β is 0, the no-load excitation power Q0 is obtained, and when β is 1, the rated load excitation power Q is obtained. k =ΔQ-Q0, then the no-load excitation power Q0 and the rated load excitation power Q k Substitute into the following formulas respectively:

[0049] Q0=I0%S e ×10 -2

[0050] Q k =U k %S e ×10 -2

[0051] Obtain no-load current I0% and short-circuit voltage U k %.

[0052] Specifically, the result output module 15 is used to output the error rate between the actual parameter and the nameplate value, which is obtained by fitting using the least squares method in this application, and can be obtained specifically by the following calculation formula:

[0053] max|δ i |=max|S(x i )-f(x i )| / f(x i )×100%

[0054] Among them, it is known that x1…x m ;y1…y m , here y i =f(x i ), i = 1, ..., m; y = S (x) is the approximate functional relationship between x and y, δ i At a given point x i In the specific implementation, the error value can be substituted into the result data to obtain the error rate, and the specific solution process will not be specifically limited here.

[0055] Specifically, the data display module 16 is used to display an active power loss characteristic curve graph and a reactive power loss characteristic curve graph, wherein the horizontal axis is the load rate and the vertical axis is the active power loss or reactive power loss.

[0056] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention rather than to limit it. Although the present invention has been described in detail with reference to the above embodiments, those skilled in the art should understand that the specific implementation modes of the present invention can still be modified or replaced by equivalents, and any modification or equivalent replacement that does not depart from the spirit and scope of the present invention should be included in the scope of the claims of the present invention.

Claims

1. A distribution transformer terminal operation data verification system, characterized in that: It comprises a handheld housing (0), wherein a calibration system module (1) is arranged inside the housing (0), wherein the calibration system module (1) is connected to a transformer monitoring system module (2) via an interface on the housing (0), and wherein the transformer monitoring system module (2) is connected to a transformer; The transformer monitoring system module (2) comprises a data acquisition module (21), a data processing module (22), a data communication module (23), a data storage module (24) and an interface module (25); the data acquisition module (21) is connected to the transformer and collects real-time operation data of the transformer; the data processing module (22) processes the collected real-time operation data of the transformer and is connected to the main station through the data communication module (23); the data storage module (24) stores the collected real-time operation data of the transformer and establishes a database; and the data storage module (24) is connected to the verification system module (1) through the interface module (25); The verification system module (1) comprises a data receiving module (11), the data receiving module (11) is connected to a data processing module (12), the data processing module (12) is connected to a data analysis module (13), the data analysis module (13) is connected to a master control module (14), the master control module (14) is connected to a result output module (15), a data display module (16) and a key input module (17), the data receiving module (11) is connected to a data storage module (25) of a transformer monitoring system module (2) via an interface module (25). 4) connecting and receiving the real-time operation data of the transformer in the database, the data processing module (12) filtering and modulating the received real-time operation data of the transformer and sending the data to the data analysis module (13), the data analysis module (13) calculating and verifying the transformer parameters and the power loss curve by using the least square method to perform curve fitting, and obtaining the transformer operation characteristics that conform to the actual situation, and the master control module (14) outputting and displaying the verification results and the power loss curve through the result output module (15) and the data display module (16).

2. A distribution transformer terminal operation data verification system according to claim 1, characterized in that: The real-time transformer operation data collected by the data collection module (21) includes active power P1 and P2 on the primary and secondary sides of the transformer, and reactive power Q1 and Q2.

3. A distribution transformer terminal operation data verification system according to claim 1, characterized in that: The data collection module (21) collects and records the collected real-time transformer operation data at one point per minute.

4. A distribution transformer terminal operation data verification system according to claim 1, characterized in that: The transformer parameters checked in the data analysis module (13) include no-load current I0%, no-load loss P0, short-circuit voltage U k %, short circuit loss P k .

5. A distribution transformer terminal operation data verification system according to claim 4, characterized in that: The no-load loss P0 and short-circuit loss P k The solution is: The corresponding load factor β is obtained according to the following formula: In the formula, P2 is the active power on the secondary side, Q2 is the reactive power on the secondary side, S e is the transformer capacity; then the active power loss ΔP is: ΔP=P0+β 2 P k ; According to the collected data, the primary and secondary active powers P1 and P2, the active power loss ΔP can be obtained as: ΔP = P1-P2, and then the corresponding table of active power loss ΔP and load rate β can be obtained. The least squares method is used for curve fitting to obtain the verified active power loss ΔP = f(β) curve. For the verified curve ΔP = f(β), when β is 0, the no-load loss P0 is obtained, and when β is 1, the short-circuit loss P is obtained. k =ΔP-P0.

6. A distribution transformer terminal operation data verification system according to claim 4, characterized in that: The no-load current I0% and short-circuit voltage U k The solution of % is: The corresponding load factor β is obtained according to the following formula: In the formula, P2 is the active power on the secondary side, Q2 is the reactive power on the secondary side, S e is the transformer capacity; then the reactive power loss ΔQ is: ΔQ=Q0+β 2 Q k , According to the collected data, the reactive power Q1 and Q2 on the primary and secondary sides can be used to obtain the reactive power loss ΔQ: ΔQ = Q1-Q2, and then the corresponding table of reactive power loss ΔQ and load rate β can be obtained. The least squares method is used for curve fitting to obtain the verified active power loss ΔQ = f(β) curve. For the verified curve ΔQ = f(β), when β is 0, the no-load excitation power Q0 is obtained, and when β is 1, the rated load excitation power Q is obtained. k =ΔQ-Q0, then the no-load excitation power Q0 and the rated load excitation power Q k Substitute into the following formulas respectively: Q0=I0%S e ×10 -2 Q k =U k %S e ×10 -2 Obtain no-load current I0% and short-circuit voltage U k %.

7. A distribution transformer terminal operation data verification system according to claim 1, characterized in that: The result output module (15) is used to output the error rate between the actual parameter and the nameplate value.

8. A distribution transformer terminal operation data verification system according to claim 1, characterized in that: The data display module (16) is used to display an active power loss characteristic curve diagram and a reactive power loss characteristic curve diagram, wherein the horizontal axis is the load rate and the vertical axis is the active power loss or reactive power loss.

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