CN111239541A - Comprehensive diagnosis system and method for power ground grid defects of transformer substation - Google Patents
Comprehensive diagnosis system and method for power ground grid defects of transformer substation Download PDFInfo
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- CN111239541A CN111239541A CN202010076185.XA CN202010076185A CN111239541A CN 111239541 A CN111239541 A CN 111239541A CN 202010076185 A CN202010076185 A CN 202010076185A CN 111239541 A CN111239541 A CN 111239541A
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- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/08—Locating faults in cables, transmission lines, or networks
- G01R31/081—Locating faults in cables, transmission lines, or networks according to type of conductors
- G01R31/086—Locating faults in cables, transmission lines, or networks according to type of conductors in power transmission or distribution networks, i.e. with interconnected conductors
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- Y04S—SYSTEMS INTEGRATING TECHNOLOGIES RELATED TO POWER NETWORK OPERATION, COMMUNICATION OR INFORMATION TECHNOLOGIES FOR IMPROVING THE ELECTRICAL POWER GENERATION, TRANSMISSION, DISTRIBUTION, MANAGEMENT OR USAGE, i.e. SMART GRIDS
- Y04S10/00—Systems supporting electrical power generation, transmission or distribution
- Y04S10/50—Systems or methods supporting the power network operation or management, involving a certain degree of interaction with the load-side end user applications
- Y04S10/52—Outage or fault management, e.g. fault detection or location
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Abstract
The utility model provides a transformer substation uses electric power ground net defect comprehensive diagnosis system and method, including the main control module, the main control module electricity is connected with filter module, data collection module and terminal PC, and filter module is configured as exporting the AC commercial power of input to the ground net circuit in the form of rectification filtering, data collection module is connected with filter module electricity is connected, is configured as collecting the detection signal data that voltage measurement sensor surveyed, the main control module is configured as the transmission data of receiving data collection module, and control filter module's work, and transmit the data after handling to terminal PC. The method and the device can obtain the defect condition of each branch of the grounding grid, can determine the running state of the substation grounding grid with longer running time, and determine whether the grounding grid needs to be modified and the mode adopted by the grounding grid modification.
Description
Technical Field
The disclosure belongs to the technical field of power equipment, and relates to a system and a method for comprehensively diagnosing defects of a power ground grid for a transformer substation.
Background
The statements in this section merely provide background information related to the present disclosure and may not necessarily constitute prior art.
The grounding grid of transformer substation is generally buried underground, belongs to hidden engineering, and the grounding grid buried underground is difficult for being damaged by external force, but difficult inspection, restoration to hardly know the current situation of grounding grid, the data and the current situation of many transformer substation grounding grids also do not accord with, and some old transformer substations do not have the grounding grid map even, and these all cause and lack data or data precision not high, can directly influence the process of transformation when transformer substation is reformed transform. The traditional grounding grid detection method is that after the grounding grid is in fault, an electrical connection fault point or a corrosion section of the grounding grid is found through excavation, and then whether total station transformation is carried out or not is determined.
The defect diagnosis method has the advantages of large blindness, lack of pertinence, incapability of preventing accidents in advance, long time consumption, large engineering quantity, much investment waste, lack of quantitative judgment basis for the problems of corrosion degree of the ground network equipment, continuous use and the like, and no detection means and detection basis.
In addition, a large number of old transformer substation grounding grids are seriously corroded and damaged so far, transformation is urgently needed, and the transformation range and the transformation sequence of the transformer substation grounding grid are difficult to effectively determine by means of the existing excavation detection method.
On the other hand, the existing ground grid reconstruction project generally adopts a direct re-laying method, although the method can radically solve the problem of ground grid faults, the method is neither scientific nor economic, and the re-laying of the ground grid lacking guidance basis can cause accelerated electrochemical corrosion of a new ground grid under certain conditions.
Disclosure of Invention
The invention aims to solve the problems and provides a comprehensive diagnosis system and method for the defects of a power grounding grid for a transformer substation.
According to some embodiments, the following technical scheme is adopted in the disclosure:
a power grounding grid defect comprehensive diagnosis system for a transformer substation comprises:
the main control module, the main control module electricity is connected with filtering module, data collection module and terminal PC, wherein:
the filtering module is configured to output the input AC commercial power to the ground network circuit in a rectification filtering mode, the data collecting module is electrically connected with the filtering module and configured to collect detection signal data measured by the voltage measuring sensor, and the main control module is configured to receive transmission data of the data collecting module, control the work of the filtering module and transmit the processed data to the terminal PC.
As a further limitation, the system further comprises a power supply module for supplying AC mains power to the filtering module under the control of the main control module.
By way of further limitation, the filtering module comprises a filter, a rectifier filter, an inverter, an output rectifier filter circuit, an auxiliary power circuit, a control circuit, a circuit protector and a detection circuit;
the output of wave filter connects to rectifier filter and auxiliary power supply's input respectively, rectifier filter's output connects to the input of dc-to-ac converter, the output of dc-to-ac converter connects to output rectifier filter input, output rectifier filter's feedback current end returns respectively to connect to control circuit and detection circuitry's input, an output of auxiliary power supply circuit connects to the input of dc-to-ac converter through control circuit, another output of auxiliary power supply circuit and detection circuitry's output all connect to the inverter input after protection action circuit and control circuit in proper order.
As a further limitation, the data collection module comprises an analog selection switch circuit, a low pass filter, a relay range switching circuit, an a/D converter and a data processor, wherein an analog signal input end of the analog selection switch circuit is connected to an input end of the a/D converter through the low pass filter and the relay range switching circuit in sequence, an output/input end of the a/D converter is connected with an input/output end of the data processor, and a data output end of the data processor is connected to a data receiving end of the terminal PC through the main control module.
As a further limitation, the terminal PC includes a data integration module and an error processing module, the data integration module is configured to integrate the data uploaded by the data collection module, and the error processing module is configured to perform error determination processing on the integrated data and display the data after error processing as detection data.
As a further limitation, the main control module includes a microprocessor and a data storage card, the microprocessor is connected to the data processor, and the data storage card is used for storing the collected data and the processed data.
The working method based on the system comprises the following steps:
s1, establishing a grounding grid model of the transformer substation according to a design drawing and a field survey result of the transformer substation to calculate the testability of the grounding grid, and establishing an excitation test set which is linear and independent, convenient to calculate and solve and strong in measurement signal based on the maximum voltage axiom;
s2, for each group of tests in the test set, finding out corresponding current excitation nodes i and i 'in a transformer substation grounding network, determining a potential reference node o in the transformer substation grounding network, selecting another reachable node x as a voltage test node x, and arranging voltage measurement sensors between o and x and at the i and i' nodes;
s3, inputting current to the filtering module, enabling the current to further enter a ground grid model, and enabling the voltage measuring sensor to obtain multiple groups of voltage data under the negative feedback effect;
s4, collecting a plurality of groups of voltage data obtained by the voltage measuring sensors, integrating and deleting bad values of the voltage data, and selecting an optimal value in the data as detection data;
and S5, carrying out ground network diagnosis based on multiple groups of detection data, calculating the optimal value, multi-solution reliability and credibility parameters of the ground network branch resistance, and further determining the position of the fault defect of the ground network of the transformer substation.
As a further limitation, current is input into the filtering module, enters the ground network model through the filter, the rectifier filter, the inverter and the output rectifier filter, and simultaneously enables the voltage measuring sensor to obtain a plurality of groups of voltage data under the negative feedback action of the auxiliary power supply, the control circuit, the circuit protector and the detection circuit.
As a further limitation, the data processor collects multiple groups of voltage data obtained by the voltage measuring sensor under the action of the switch circuit, the low-pass filter, the relay range switching circuit and the a/D converter, and uploads the multiple groups of voltage data to the data receiving end of the terminal PC through the main control module.
As a further limitation, after receiving multiple sets of voltage data, the terminal PC integrates the voltage data by the data integration module, then the error processing module extracts bad values in the data, and selects an optimal value in the data as detection data.
Compared with the prior art, the beneficial effect of this disclosure is:
1. the transformer substation grounding grid model can be established by arranging a power supply module, a filtering module, a data collecting module and a terminal PC (personal computer), current is input into the filtering module, rectified and filtered, and then output into the grounding grid model, a plurality of groups of data are measured by a voltage measuring sensor, the defect condition of each branch of the grounding grid is obtained, the running state of the transformer substation grounding grid with longer running time can be determined, and whether grounding grid transformation is needed or not and the mode adopted by the grounding grid transformation is determined;
2. by the defect diagnosis system and method, uninterrupted nondestructive detection and diagnosis of the transformer substation can be realized, and whether ground grid reconstruction is needed or not and the mode adopted by the ground grid reconstruction are determined, so that unnecessary material waste is avoided, a large amount of labor cost and financial and material resources are saved, the transformer substation has reliable ground grid protection, and the safe and reliable operation of a power grid can be better ensured.
Drawings
The accompanying drawings, which are included to provide a further understanding of the disclosure, illustrate embodiments of the disclosure and together with the description serve to explain the disclosure and are not to limit the disclosure.
Fig. 1 is a system block diagram of a system for comprehensively diagnosing defects of a power ground grid for a transformer substation according to the present embodiment;
fig. 2 is a schematic diagram of the working principle of the filtering module according to the present embodiment;
fig. 3 is a schematic diagram of the working principle of the data collection module according to the present embodiment;
fig. 4 is a system block diagram of the terminal PC proposed in the present embodiment;
FIG. 5 is a block diagram of a method for using the power ground grid defect comprehensive diagnosis system for the transformer substation.
The specific implementation mode is as follows:
the present disclosure is further described with reference to the following drawings and examples.
It should be noted that the following detailed description is exemplary and is intended to provide further explanation of the disclosure. Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this disclosure belongs.
It is noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of example embodiments according to the present disclosure. As used herein, the singular forms "a", "an" and "the" are intended to include the plural forms as well, and it should be understood that when the terms "comprises" and/or "comprising" are used in this specification, they specify the presence of stated features, steps, operations, devices, components, and/or combinations thereof, unless the context clearly indicates otherwise.
As shown in fig. 1, a power ground grid defect comprehensive diagnosis system for a transformer substation comprises a main control module, wherein the main control module is electrically connected with a power module, a filter module, a data collection module and a terminal PC, the main control module comprises an embedded microprocessor and a data storage card, the power module is used for supplying AC mains supply to the filter module under the control of the main control module, the filter module is used for outputting the AC mains supply to a ground grid circuit in a rectification filter mode, the data collection module is electrically connected with the filter module, and the data collection module is used for collecting detection signal data measured by a voltage measurement sensor.
As shown in fig. 2, the filter module includes a filter, a rectifier filter, an inverter, an output rectifier filter circuit, an auxiliary power circuit, a control circuit, a circuit protector, and a detection circuit.
The output of wave filter connects to rectifier filter and auxiliary power supply's input respectively, rectifier filter's output connects to the input of dc-to-ac converter, the output of dc-to-ac converter connects to output rectifier filter input, output rectifier filter's feedback current end returns respectively to connect to control circuit and detection circuitry's input, an output of auxiliary power supply circuit connects to the input of dc-to-ac converter through control circuit, another output of auxiliary power supply circuit and detection circuitry's output all connect to the inverter input after protection action circuit and control circuit in proper order.
As shown in fig. 3, the data collection module includes an analog selection switch circuit, a low pass filter, a relay range switching circuit, an a/D converter, and a data processor.
The analog signal input end of the analog selection switch circuit is connected to the input end of the A/D converter through the low-pass filter and the relay range switching circuit in sequence, the output/input end of the A/D converter is connected with the input/output end of the data processor, and the data output end of the data processor is connected to the data receiving end of the terminal PC through the main control module.
As shown in fig. 4, the terminal PC includes a data integration module for integrating data uploaded by the data collection module, and an error processing module for performing error determination processing on the integrated data and displaying the error-processed data as detection data.
When the system is used, a transformer substation grounding grid model needs to be established firstly, a potential reference node and a voltage test node are determined in the grounding grid, a voltage measurement sensor is arranged at the node, then current is input into a filtering module and is output into the grounding grid model after rectification and filtering, a plurality of groups of data are measured by the voltage measurement sensor, a data collection module can collect the data and upload the data to a terminal PC, the terminal PC integrates the data and carries out error processing on the data, and a worker substitutes the data into a software algorithm of a grounding grid diagnosis system to obtain the defect condition of each branch of the grounding grid, so that the running state of the transformer substation grounding grid with long running time can be determined, and whether the grounding grid needs to be modified and the mode adopted by the grounding grid modification can be determined.
Referring to fig. 5, a method for using a power ground grid defect comprehensive diagnosis system for a transformer substation includes the following steps:
s1, according to a design drawing and a field survey result of the transformer substation, establishing a ground network model of the transformer substation to calculate the testability of the ground network, establishing an excitation test set which is linear and independent, convenient to calculate and solve and strong in measurement signal based on the maximum voltage axiom, and establishing a software algorithm of a ground network diagnosis system;
s2, for each group of tests in the test set, finding out corresponding current excitation nodes i and i 'in a transformer substation grounding network, determining a potential reference node o in the transformer substation grounding network, selecting another reachable node x as a voltage test node x, and arranging high-precision voltage measurement sensors between o and x and at the i and i' nodes;
s3, inputting current to the filtering module, enabling the current to enter a ground grid model through a filter, a rectifier filter, an inverter and an output rectifier filter, and enabling the voltage measuring sensor to obtain multiple groups of voltage data under the negative feedback action of an auxiliary power supply, a control circuit, a circuit protector and a detection circuit;
s4, collecting multiple groups of voltage data obtained by the voltage measuring sensor by the data processor under the action of the switch circuit, the low-pass filter, the relay range switching circuit and the A/D converter, and uploading the multiple groups of voltage data to a data receiving end of the terminal PC through the main control module;
s5, after receiving multiple groups of voltage data, the terminal PC integrates the voltage data by the data integration module, then the error processing module extracts bad values in the data, and selects the optimal value in the data as detection data;
s6, calculating relevant parameters such as the optimal value of the branch resistance of the grounding grid, the multi-solution reliability, the credibility and the like in the plurality of groups of detection data with the software algorithm of the grounding grid diagnosis system, and further determining the position of the fault defect of the grounding grid of the transformer substation.
The method can realize nondestructive detection and diagnosis of the substation without power failure, and determine whether the reconstruction of the ground grid and the mode adopted by the reconstruction of the ground grid are needed, thereby avoiding unnecessary material waste, saving a large amount of labor cost, financial resources and material resources, ensuring that the substation has reliable ground grid protection, and better ensuring the safe and reliable operation of the power grid.
As will be appreciated by one skilled in the art, embodiments of the present disclosure may be provided as a method, system, or computer program product. Accordingly, the present disclosure may take the form of an entirely hardware embodiment, an entirely software embodiment or an embodiment combining software and hardware aspects. Furthermore, the present disclosure 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 so forth) having computer-usable program code embodied therein.
The present disclosure is described with reference to flowchart illustrations and/or block diagrams of methods, apparatus (systems), and computer program products according to embodiments of the disclosure. 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.
The above description is only a preferred embodiment of the present disclosure and is not intended to limit the present disclosure, and various modifications and changes may be made to the present disclosure by those skilled in the art. Any modification, equivalent replacement, improvement and the like made within the spirit and principle of the present disclosure should be included in the protection scope of the present disclosure.
Although the present disclosure has been described with reference to specific embodiments, it should be understood that the scope of the present disclosure is not limited thereto, and those skilled in the art will appreciate that various modifications and changes can be made without departing from the spirit and scope of the present disclosure.
Claims (10)
1. A power ground grid defect comprehensive diagnosis system for a transformer substation is characterized in that: the method comprises the following steps:
the main control module, the main control module electricity is connected with filtering module, data collection module and terminal PC, wherein:
the filtering module is configured to output the input AC commercial power to the ground network circuit in a rectification filtering mode, the data collecting module is electrically connected with the filtering module and configured to collect detection signal data measured by the voltage measuring sensor, and the main control module is configured to receive transmission data of the data collecting module, control the work of the filtering module and transmit the processed data to the terminal PC.
2. The system for comprehensively diagnosing the defects of the power ground grid for the transformer substation as claimed in claim 1, wherein: the system also comprises a power supply module, wherein the power supply module is used for supplying AC commercial power to the filtering module under the control of the main control module.
3. The system for comprehensively diagnosing the defects of the power ground grid for the transformer substation as claimed in claim 1, wherein: the filtering module comprises a filter, a rectifier filter, an inverter, an output rectifier filter circuit, an auxiliary power circuit, a control circuit, a circuit protector and a detection circuit;
the output of wave filter connects to rectifier filter and auxiliary power supply's input respectively, rectifier filter's output connects to the input of dc-to-ac converter, the output of dc-to-ac converter connects to output rectifier filter input, output rectifier filter's feedback current end returns respectively to connect to control circuit and detection circuitry's input, an output of auxiliary power supply circuit connects to the input of dc-to-ac converter through control circuit, another output of auxiliary power supply circuit and detection circuitry's output all connect to the inverter input after protection action circuit and control circuit in proper order.
4. The system for comprehensively diagnosing the defects of the power ground grid for the transformer substation as claimed in claim 1, wherein: the data collection module comprises an analog selection switch circuit, a low-pass filter, a relay range switching circuit, an A/D converter and a data processor, wherein an analog signal input end of the analog selection switch circuit is connected to an input end of the A/D converter through the low-pass filter and the relay range switching circuit in sequence, an output/input end of the A/D converter is connected with an input/output end of the data processor, and a data output end of the data processor is connected to a data receiving end of a terminal PC through a main control module.
5. The system for comprehensively diagnosing the defects of the power ground grid for the transformer substation as claimed in claim 1, wherein: the terminal PC comprises a data integration module and an error processing module, the data integration module is used for integrating data uploaded by the data collection module, the error processing module is used for carrying out error judgment processing on the integrated data, and the data subjected to error processing is displayed as detection data.
6. The system for comprehensively diagnosing the defects of the power ground grid for the transformer substation as claimed in claim 1, wherein: the main control module comprises a microprocessor and a data storage card, the microprocessor is connected with the data processor, and the data storage card is used for storing the acquired data and the processed data.
7. Method of operating a system according to any of claims 1-6, characterized by: the method comprises the following steps:
s1, establishing a grounding grid model of the transformer substation according to a design drawing and a field survey result of the transformer substation to calculate the testability of the grounding grid, and establishing an excitation test set which is linear and independent, convenient to calculate and solve and strong in measurement signal based on the maximum voltage axiom;
s2, for each group of tests in the test set, finding out corresponding current excitation nodes i and i 'in a transformer substation grounding network, determining a potential reference node o in the transformer substation grounding network, selecting another reachable node x as a voltage test node x, and arranging voltage measurement sensors between o and x and at the i and i' nodes;
s3, inputting current to the filtering module, enabling the current to further enter a ground grid model, and enabling the voltage measuring sensor to obtain multiple groups of voltage data under the negative feedback effect;
s4, collecting a plurality of groups of voltage data obtained by the voltage measuring sensors, integrating and deleting bad values of the voltage data, and selecting an optimal value in the data as detection data;
and S5, carrying out ground network diagnosis based on multiple groups of detection data, calculating the optimal value, multi-solution reliability and credibility parameters of the ground network branch resistance, and further determining the position of the fault defect of the ground network of the transformer substation.
8. The method of operation of claim 7, wherein: and current is input into the filtering module, enters the ground network model through the filter, the rectifier filter, the inverter and the output rectifier filter, and enables the voltage measuring sensor to obtain a plurality of groups of voltage data under the negative feedback action of the auxiliary power supply, the control circuit, the circuit protector and the detection circuit.
9. The method of operation of claim 7, wherein: the data processor collects multiple groups of voltage data obtained by the voltage measuring sensor under the action of the switch circuit, the low-pass filter, the relay range switching circuit and the A/D converter, and uploads the multiple groups of voltage data to a data receiving end of the terminal PC through the main control module.
10. The method of operation of claim 7, wherein: after receiving multiple groups of voltage data, the terminal PC integrates the voltage data by the data integration module, then takes out bad values in the data by the error processing module, and selects the optimal value in the data as detection data.
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| CN102928704A (en) * | 2012-10-26 | 2013-02-13 | 湖州电力局 | Intelligent diagnosis method for corrosion failure point of transformer substation grounding grid |
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| CN1245898A (en) * | 1999-07-02 | 2000-03-01 | 清华大学 | Diagnosis method of earth screen corrosion and breakpoint of electric substation and its measurement and diagnosis system |
| CN101493491A (en) * | 2009-02-16 | 2009-07-29 | 陕西电力科学研究院 | Substation ground network defect synthesis diagnosis method and diagnosis system thereof |
| CN102928704A (en) * | 2012-10-26 | 2013-02-13 | 湖州电力局 | Intelligent diagnosis method for corrosion failure point of transformer substation grounding grid |
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