CN113241853A - Intelligent diagnosis and early warning method and system for capacitance current of transformer substation - Google Patents

Intelligent diagnosis and early warning method and system for capacitance current of transformer substation Download PDF

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Publication number
CN113241853A
CN113241853A CN202110577570.7A CN202110577570A CN113241853A CN 113241853 A CN113241853 A CN 113241853A CN 202110577570 A CN202110577570 A CN 202110577570A CN 113241853 A CN113241853 A CN 113241853A
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current value
arc
capacitance
transformer substation
current
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CN113241853B (en
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肖京
易辉
李欣
袁培
彭平
任章鳌
欧乐知
赵世华
向缨竹
邹晨桥
许谱名
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State Grid Corp of China SGCC
Electric Power Research Institute of State Grid Hunan Electric Power Co Ltd
State Grid Hunan Electric Power Co Ltd
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State Grid Corp of China SGCC
Electric Power Research Institute of State Grid Hunan Electric Power Co Ltd
State Grid Hunan Electric Power Co Ltd
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    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J13/00—Circuit arrangements for providing remote indication of network conditions, e.g. an instantaneous record of the open or closed condition of each circuitbreaker in the network; Circuit arrangements for providing remote control of switching means in a power distribution network, e.g. switching in and out of current consumers by using a pulse code signal carried by the network
    • H02J13/00001—Circuit arrangements for providing remote indication of network conditions, e.g. an instantaneous record of the open or closed condition of each circuitbreaker in the network; Circuit arrangements for providing remote control of switching means in a power distribution network, e.g. switching in and out of current consumers by using a pulse code signal carried by the network characterised by the display of information or by user interaction, e.g. supervisory control and data acquisition systems [SCADA] or graphical user interfaces [GUI]
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J13/00—Circuit arrangements for providing remote indication of network conditions, e.g. an instantaneous record of the open or closed condition of each circuitbreaker in the network; Circuit arrangements for providing remote control of switching means in a power distribution network, e.g. switching in and out of current consumers by using a pulse code signal carried by the network
    • H02J13/00002—Circuit arrangements for providing remote indication of network conditions, e.g. an instantaneous record of the open or closed condition of each circuitbreaker in the network; Circuit arrangements for providing remote control of switching means in a power distribution network, e.g. switching in and out of current consumers by using a pulse code signal carried by the network characterised by monitoring
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J13/00—Circuit arrangements for providing remote indication of network conditions, e.g. an instantaneous record of the open or closed condition of each circuitbreaker in the network; Circuit arrangements for providing remote control of switching means in a power distribution network, e.g. switching in and out of current consumers by using a pulse code signal carried by the network
    • H02J13/00006—Circuit arrangements for providing remote indication of network conditions, e.g. an instantaneous record of the open or closed condition of each circuitbreaker in the network; Circuit arrangements for providing remote control of switching means in a power distribution network, e.g. switching in and out of current consumers by using a pulse code signal carried by the network characterised by information or instructions transport means between the monitoring, controlling or managing units and monitored, controlled or operated power network element or electrical equipment
    • H02J13/00022—Circuit arrangements for providing remote indication of network conditions, e.g. an instantaneous record of the open or closed condition of each circuitbreaker in the network; Circuit arrangements for providing remote control of switching means in a power distribution network, e.g. switching in and out of current consumers by using a pulse code signal carried by the network characterised by information or instructions transport means between the monitoring, controlling or managing units and monitored, controlled or operated power network element or electrical equipment using wireless data transmission
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J13/00—Circuit arrangements for providing remote indication of network conditions, e.g. an instantaneous record of the open or closed condition of each circuitbreaker in the network; Circuit arrangements for providing remote control of switching means in a power distribution network, e.g. switching in and out of current consumers by using a pulse code signal carried by the network
    • H02J13/00032—Systems characterised by the controlled or operated power network elements or equipment, the power network elements or equipment not otherwise provided for
    • H02J13/00034—Systems characterised by the controlled or operated power network elements or equipment, the power network elements or equipment not otherwise provided for the elements or equipment being or involving an electric power substation
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y04—INFORMATION OR COMMUNICATION TECHNOLOGIES HAVING AN IMPACT ON OTHER TECHNOLOGY AREAS
    • 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
    • Y04S10/16—Electric power substations
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y04—INFORMATION OR COMMUNICATION TECHNOLOGIES HAVING AN IMPACT ON OTHER TECHNOLOGY AREAS
    • 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
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y04—INFORMATION OR COMMUNICATION TECHNOLOGIES HAVING AN IMPACT ON OTHER TECHNOLOGY AREAS
    • 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
    • Y04S40/00—Systems for electrical power generation, transmission, distribution or end-user application management characterised by the use of communication or information technologies, or communication or information technology specific aspects supporting them
    • Y04S40/12—Systems for electrical power generation, transmission, distribution or end-user application management characterised by the use of communication or information technologies, or communication or information technology specific aspects supporting them characterised by data transport means between the monitoring, controlling or managing units and monitored, controlled or operated electrical equipment
    • Y04S40/126—Systems for electrical power generation, transmission, distribution or end-user application management characterised by the use of communication or information technologies, or communication or information technology specific aspects supporting them characterised by data transport means between the monitoring, controlling or managing units and monitored, controlled or operated electrical equipment using wireless data transmission

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  • Power Engineering (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Human Computer Interaction (AREA)
  • Testing Electric Properties And Detecting Electric Faults (AREA)

Abstract

The invention discloses a transformer substation capacitance current intelligent diagnosis early warning method and a system thereof1Greater than a preset threshold A and a system capacitance current value I1Is located in [ Imin,Imax) In the range, the transformer substation is provided with an arc extinction device and a system capacitance current value I1And the capacitance current value I detected by the arc extinction device0The difference between them is (0, A)]And under the condition that the range is established simultaneously, the existing arc suppression devices of the transformer substation are judged to meet overcompensation and meet the capacity, and arc suppression devices do not need to be additionally arranged. The invention can obtain the system capacitance current value I based on the test of the test instrument1Combining a preset threshold A, a compensation current interval of an arc extinction device and a system capacitance current value I1And the capacitance current value I detected by the arc extinction device0The difference between the two values can judge whether the capacity of the arc suppression device of the transformer substation meets the requirement, and the method has the advantages of high judgment accuracy and good universality.

Description

Intelligent diagnosis and early warning method and system for capacitance current of transformer substation
Technical Field
The invention belongs to the power system diagnosis technology, and particularly relates to a transformer substation capacitance and current intelligent diagnosis and early warning method and system.
Background
At present, most of urban and rural 10kV, 35kV and 66kV power distribution networks in China are neutral point non-effective grounding systems, and when a single-phase grounding fault occurs in the system, the line voltage of the system is still a three-phase symmetrical network, so that the normal power supply of the system cannot be influenced. The early power distribution network has a simple structure, the power grid system is not large in scale and mainly adopts an overhead line, single-phase earth faults often occur to the power distribution network due to the influences of lightning strikes, strong wind, trees and the like, the power distribution network is allowed to operate for 1-2 hours with faults in order to guarantee the reliability of power supply and facilitate fault finding, and intermittent arcs can be automatically extinguished and the single-phase earth faults can be automatically recovered due to the fact that the capacitance current of the system during single-phase earth is not large. However, with the continuous expansion of the scale of the power grid and the continuous improvement of the power supply system of the distribution network, the use of power cable lines is increased, and the capacitance current of the system is increased, so that the arc cannot be reliably extinguished when the single-phase earth fault occurs in the distribution network, the arc is rapidly developed into an interphase short circuit, the line trip and the power supply interruption are caused, and the reliability of the power supply of the distribution network is seriously influenced. In addition, because the grounding capacitance current is large, arc grounding overvoltage formed by intermittent arc extinguishing and restriking is high in overvoltage multiple or ferromagnetic resonance overvoltage is excited, so that insulation breakdown damage of electrical equipment such as a voltage transformer, a cable head and the like is caused.
In order to solve the problems, the transformer substation is often provided with an arc suppression device to compensate the capacitance current when the system is grounded in a single phase. For a transformer substation without an arc suppression device, before installation, the capacitance current of a system needs to be accurately measured to judge whether the arc suppression device needs to be additionally installed; for a transformer substation with an arc suppression device installed, a capacitance current test is also carried out regularly to judge whether the capacity of the arc suppression device meets the compensation requirement. At present, capacitance and current testing is often carried out manually, information such as transformer substation names, bus operation modes, arc suppression device capacity and compensation states needs to be recorded during measurement, whether compensation requirements are met needs to be judged manually after recording, most of data records are scattered and single, the change trend of test data of previous times cannot be utilized, diagnosis and early warning suggestions are given, and the improvement of operation and inspection efficiency is not facilitated. Therefore, it is necessary to develop an intelligent diagnosis and early warning system and method for the capacitance and current of the transformer substation, so as to quickly and accurately diagnose whether the system needs to be additionally provided with an arc extinction device or increase the capacity of the arc extinction device, reduce the field test workload and the judgment error rate, and improve the utilization value of test data and the operation and inspection efficiency of basic teams and groups.
Disclosure of Invention
The technical problems to be solved by the invention are as follows: aiming at the problems in the prior art, the invention provides the intelligent diagnosis and early warning method and device for the capacitance current of the transformer substation, and the invention can obtain the system capacitance current value I based on the test of the test instrument1Combining a preset threshold A, a compensation current interval of an arc extinction device and a system capacitance current value I1And the capacitance current value I detected by the arc extinction device0The difference between the two values can judge whether the capacity of the arc suppression device of the transformer substation meets the requirement, and the method has the advantages of high judgment accuracy and good universality.
In order to solve the technical problems, the invention adopts the technical scheme that:
a transformer substation capacitance and current intelligent diagnosis and early warning method comprises the following steps:
1) obtaining the system capacitance current value I obtained by the test of the test instrument1；
2) At the system capacitance current value I1Greater than a preset threshold A and a system capacitance current value I1Is located in [ Imin,Imax) In the range, the transformer substation is provided with an arc extinction device and a system capacitance current value I1And the capacitance current value I detected by the arc extinction device0The difference between them is (0, A)]The existing arc suppression devices of the transformer substation are judged to meet overcompensation and meet the capacity requirement under the condition that the range is established simultaneously, and arc suppression devices do not need to be additionally arranged; wherein, IminMinimum compensation current for arc-extinguishing means, ImaxThe maximum compensation current of the arc extinction device.
Optionally, step 2) further includes obtaining a system capacitance current value I1Greater than a preset threshold A and a system capacitance current value I1Is located in [ Imin,Imax) In the range, the transformer substation is provided with an arc extinction device and a system capacitance current value I1And the capacitance current value I detected by the arc extinction device0The difference between them is (0, A)]The following processing steps are carried out under the condition that the ranges are out of the range simultaneously: judging whether the arc extinction device has a step difference and a gear, if so, calculating to meet the condition I according to the step difference K and the gear M of the arc extinction devicemin+(N-1)*K≤I1＜IminAnd positive integer N which is + N × K and N is less than or equal to M, judging whether a measurer of the arc extinction device and a controller need to be checked to determine whether faults exist, and shifting the gear of the arc extinction device to N gear to meet overcompensation.
Optionally, after determining whether the transformer has a step difference and a gear, determining whether a fault exists in a measurer of the arc extinction device that needs to be checked if the transformer has no step difference and gear, and adjusting the gear of the arc extinction device to a proper gear to satisfy overcompensation, where the overcompensation current is less than or equal to a preset threshold a.
Optionally, step 2) further includes obtaining a system capacitance current value I1Greater than a preset threshold A and a system capacitance current value I1Less than minimum compensation current I of arc-extinguishing deviceminSystem capacitance current value I1And minimum compensation current I of arc extinction deviceminThe difference between them is (0, A)]And under the condition that the ranges are simultaneously established, judging whether the gear of the arc extinction device needs to be checked to be positioned at the lowest gear or not, and if not, adjusting the arc extinction device to the lowest gear to meet the overcompensation.
Optionally, step 2) further includes obtaining a system capacitance current value I1Greater than a preset threshold A and a system capacitance current value I1Less than minimum compensation current I of arc-extinguishing deviceminSystem capacitance current value I1And minimum compensation current I of arc extinction deviceminThe difference between them is (0, A)]Under the condition that the range is simultaneously satisfied, the capacity of the arc extinction device is judged to be too large, and the arc extinction device with the capacity being the optimal capacity W is suggested to be selected.
Optionally, step 2) further includes obtaining a system capacitance current value I1Greater than a preset threshold A and a system capacitance current value I1More than or equal to minimum compensation current I of arc suppression deviceminAnd judging that the capacity of the arc suppression device is too small under the condition that the capacity of the arc suppression device is satisfied, and suggesting that the arc suppression device is additionally arranged, so that the sum of the capacities of all the arc suppression devices of the transformer meets the optimal capacity W.
Optionally, the calculation function expression of the optimal capacity W is:
Figure BDA0003084884150000021
in the above formula, ICFor grounding capacitive current, UnIs the system nominal voltage.
Optionally, step 2) further includes obtaining a system capacitance current value I1Under the condition that the value is less than or equal to a preset threshold value A, judging that an arc extinction device needs to be additionally installed or quit; step 2) also comprises a system capacitance current value I1And judging that arc suppression devices are added under the condition that the sum of the capacities of all the arc suppression devices of the transformer meets the optimal capacity W when the sum is larger than the preset threshold A and the arc suppression devices are not installed in the transformer substation.
In addition, the invention also provides a transformer substation capacitance and current intelligent diagnosis and early warning system which comprises a microprocessor and a memory which are connected with each other, wherein the microprocessor is programmed or configured to execute the steps of the transformer substation capacitance and current intelligent diagnosis and early warning method.
In addition, the invention also provides a computer readable storage medium, wherein a computer program programmed or configured to execute the intelligent substation capacitance and current diagnosis and early warning method is stored in the computer readable storage medium.
Compared with the prior art, the invention has the following advantages:
1. the invention includes the current value I of the system capacitor1Greater than a preset threshold A and a system capacitance current value I1Is located in [ Imin,Imax) In the range, the transformer substation is provided with an arc extinction device and a system capacitance current value I1And the capacitance current value I detected by the arc extinction device0The difference between them is (0, A)]The method can judge that the existing arc suppression devices of the transformer substation meet overcompensation and capacity under the condition that the ranges are simultaneously established, and the arc suppression devices do not need to be additionally arranged1Combining a preset threshold A, a compensation current interval of an arc extinction device and a system capacitance current value I1And the capacitance current value I detected by the arc extinction device0The difference between the two judgment methods realizes judgment of whether the capacity of the arc suppression device of the transformer substation meets the requirement or not, and has the advantage of high judgment accuracy.
2. The method can be suitable for diagnosing and early warning the abnormity of the capacitance current of 10kV, 35kV and 66kV system buses of a 35-220kV voltage class transformer substation, and has the advantage of good universality.
Drawings
FIG. 1 is a schematic view of a complete flow of the method of the present invention.
FIG. 2 is a schematic structural diagram of an apparatus according to an embodiment of the present invention.
Detailed Description
Referring to fig. 1, the intelligent diagnosis and early warning method for the capacitance current of the transformer substation in the embodiment includes:
1) obtaining the system capacitance current value I obtained by the test of the test instrument1；
2) At the system capacitance current value I1Greater than a preset threshold A and a system capacitance current value I1Is located in [ Imin,Imax) In the range, the transformer substation is provided with an arc extinction device and a system capacitance current value I1And the capacitance current value I detected by the arc extinction device0The difference between them is (0, A)]The existing arc suppression devices of the transformer substation are judged to meet overcompensation and meet the capacity requirement under the condition that the range is established simultaneously, and arc suppression devices do not need to be additionally arranged; wherein, IminMinimum compensation current for arc-extinguishing means, ImaxThe maximum compensation current of the arc extinction device.
Referring to fig. 1, the step 2) of the present embodiment further includes a system capacitance current value I1Greater than a preset threshold A and a system capacitance current value I1Is located in [ Imin,Imax) In the range, the transformer substation is provided with an arc extinction device and a system capacitance current value I1And the capacitance current value I detected by the arc extinction device0The difference between them is (0, A)]The following processing steps are carried out under the condition that the ranges are out of the range simultaneously: judging whether the arc extinction device has a step difference and a gear, if so, calculating to meet the condition I according to the step difference K and the gear M of the arc extinction devicemin+(N-1)*K≤I1＜IminAnd positive integer N which is + N × K and N is less than or equal to M, judging whether a measurer of the arc extinction device and a controller need to be checked to determine whether faults exist, and shifting the gear of the arc extinction device to N gear to meet overcompensation.
Referring to fig. 1, after determining whether the transformer has a step difference and a gear, the present embodiment further includes determining whether a fault exists in a measurer that needs to check the arc extinction device when the transformer has no step difference and gear, and adjusting the gear of the arc extinction device to a proper gear to satisfy overcompensation, where the overcompensation current is less than or equal to a preset threshold a.
Referring to fig. 1, the step 2) of the present embodiment further includes system powerCapacitance current value I1Greater than a preset threshold A and a system capacitance current value I1Less than minimum compensation current I of arc-extinguishing deviceminSystem capacitance current value I1And minimum compensation current I of arc extinction deviceminThe difference between them is (0, A)]And under the condition that the ranges are simultaneously established, judging whether the gear of the arc extinction device needs to be checked to be positioned at the lowest gear or not, and if not, adjusting the arc extinction device to the lowest gear to meet the overcompensation.
Referring to fig. 1, the step 2) of the present embodiment further includes a system capacitance current value I1Greater than a preset threshold A and a system capacitance current value I1Less than minimum compensation current I of arc-extinguishing deviceminSystem capacitance current value I1And minimum compensation current I of arc extinction deviceminThe difference between them is (0, A)]Under the condition that the range is simultaneously satisfied, the capacity of the arc extinction device is judged to be too large, and the arc extinction device with the capacity being the optimal capacity W is suggested to be selected.
Referring to fig. 1, the step 2) of the present embodiment further includes a system capacitance current value I1Greater than a preset threshold A and a system capacitance current value I1More than or equal to minimum compensation current I of arc suppression deviceminAnd judging that the capacity of the arc suppression device is too small under the condition that the capacity of the arc suppression device is satisfied, and suggesting that the arc suppression device is additionally arranged, so that the sum of the capacities of all the arc suppression devices of the transformer meets the optimal capacity W.
In this embodiment, the calculation function expression of the optimal capacity W is:
Figure BDA0003084884150000041
in the above formula, ICFor grounding capacitive current, UnIs the system nominal voltage.
Referring to fig. 1, the step 2) of the present embodiment further includes a system capacitance current value I1Under the condition that the value is less than or equal to a preset threshold value A, judging that an arc extinction device needs to be additionally installed or quit; step 2) also comprises a system capacitance current value I1Judging that the arc suppression device is additionally arranged under the condition that the value is larger than a preset threshold value A and the arc suppression device is not arranged in the transformer substation and is simultaneously established, so that the arc suppression device is arrangedThe sum of the capacities of all arc suppression devices of the transformer meets the optimal capacity W.
As shown in fig. 1, the method of this embodiment is driven by a detection task, a new detection task is required after the detection is started, then a detection method is selected for the detection task and information and parameters are input, before the above steps are performed, it is required to detect in advance whether the input information and parameters and wiring are correct, and only if the input information and parameters and wiring are correct, the next step is performed. In addition, after the steps, the method also comprises the step of judging whether the detection result information is complete and correct, and if the detection result information is complete and correct, the data is saved and quit; otherwise, prompting that the information is incomplete, and please re-detect after checking.
In addition, the present embodiment also provides a transformer substation capacitance and current intelligent diagnosis and early warning system, which includes a microprocessor and a memory connected to each other, where the microprocessor is programmed or configured to execute the steps of the aforementioned transformer substation capacitance and current intelligent diagnosis and early warning method.
As shown in fig. 2, as an example of a specific implementation of the intelligent diagnosis and early warning system for the capacitive current of the substation in this embodiment, a main body formed by a microprocessor and a memory connected to each other is an information unit, the information unit is further connected to a display unit, a wireless transmission unit, and a testing apparatus (capacitive current testing apparatus) respectively, the testing apparatus includes a control unit, an ac constant current source, and a sampling module, and further includes a working power source, and the information unit, the control unit, and the ac constant current source are respectively powered by the working power source. The wireless transmission unit transmits the data to the back-end server through a wireless network, and the back-end server can realize various access modes facing the access application end by utilizing an access port provided by the network, including access of the access application ends such as a web end, a mobile phone end and a cloud end. The working process of the intelligent diagnosis and early warning system for the capacitance and the current of the transformer substation is as follows: the power-on self-test of the working power supply is carried out by AC220V, the CPU board of the information unit sets parameters, and the capacitance current I is measured by an injection method of injecting signal current to the system neutral point by an AC constant current source1. The information unit can carry out test data through the display unitThe data can be visually displayed, or can be sent to a networked back-end server through a wireless transmission unit through communication modules (such as 3G, 4G and the like), the received data can be automatically stored in a database, and a detailed diagnosis and evaluation algorithm is arranged in the server, so that automatic calculation and analysis can be realized. And data access, statistics, analysis and modification can be performed through networking of application terminals such as a mobile phone App and a Web page. The following requirements should be met for the neutral point resonance grounding mode: the resonance grounding is preferably an arc suppression coil device with an automatic tracking compensation function; when the automatic tracking compensation arc suppression coil device is in normal operation, the long-time voltage displacement of a neutral point is ensured not to exceed 15% of the nominal phase voltage of a system. Therefore, aiming at the problems that the field data of the capacitance current test of the transformer substation are complicated to record, accurate and effective diagnosis and analysis cannot be quickly provided, the system grounding reliability cannot be accurately evaluated, the test data cannot be fully and effectively utilized and the like, the intelligent diagnosis and early warning system and the intelligent diagnosis and early warning method for the capacitance current of the transformer substation are provided, the problem of how to quickly diagnose and evaluate the capacitance current condition of the system is solved, a suggestion whether an arc suppression coil device needs to be additionally arranged or the capacity of the arc suppression coil device needs to be increased is given, and the intelligent diagnosis and early warning for the capacitance current of a 10-35kV bus of the transformer substation are realized and are uploaded to a rear-end server.
The intelligent diagnosis and early warning system for the capacitance current of the transformer substation can evaluate and early warn whether a 10-66kV bus of the transformer substation needs to be additionally provided with an arc suppression coil device or adjust the capacity of the arc suppression coil device by adopting the intelligent diagnosis and early warning method for the capacitance current of the transformer substation, is suitable for abnormal diagnosis and early warning of the capacitance current of the 10kV, 35kV and 66kV system buses of the transformer substation with the voltage class of 35-220kV, can wirelessly transmit a series of data such as capacitance current test values, diagnosis and early warning results and the like to a rear-end server, and realizes data storage, analysis, retrieval and display.
In addition, the present embodiment also provides a computer readable storage medium, in which a computer program programmed or configured to execute the foregoing transformer substation capacitance and current intelligent diagnosis and early warning method is stored.
As will be appreciated by one skilled in the art, embodiments of the present application may be provided as a method, system, or computer program product. Accordingly, the present application may take the form of an entirely hardware embodiment, an entirely software embodiment or an embodiment combining software and hardware aspects. Furthermore, the present application may take the form of a computer program product embodied on one or more computer-readable storage media (including, but not limited to, disk storage, CD-ROM, optical storage, and the like) having computer-usable program code embodied therein. The present application is described with reference to flowchart illustrations and/or block diagrams of methods, apparatus (systems), and computer program products according to embodiments of the application. It will be understood that each flow and/or block of the flow diagrams and/or block diagrams, and combinations of flows and/or blocks in the flow diagrams and/or block diagrams, can be implemented by computer program instructions. These computer program instructions may be provided to a processor of a general purpose computer, special purpose computer, embedded processor, or other programmable data processing apparatus to produce a machine, such that the instructions, which execute via the processor of the computer or other programmable data processing apparatus, create means for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks. These computer program instructions may also be stored in a computer-readable memory that can direct a computer or other programmable data processing apparatus to function in a particular manner, such that the instructions stored in the computer-readable memory produce an article of manufacture including instruction means which implement the function specified in the flowchart flow or flows and/or block diagram block or blocks. These computer program instructions may also be loaded onto a computer or other programmable data processing apparatus to cause a series of operational steps to be performed on the computer or other programmable apparatus to produce a computer implemented process such that the instructions which execute on the computer or other programmable apparatus provide steps for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
The above description is only a preferred embodiment of the present invention, and the protection scope of the present invention is not limited to the above embodiments, and all technical solutions belonging to the idea of the present invention belong to the protection scope of the present invention. It should be noted that modifications and embellishments within the scope of the invention may occur to those skilled in the art without departing from the principle of the invention, and are considered to be within the scope of the invention.

Claims (10)

1. The intelligent diagnosis and early warning method for the capacitance current of the transformer substation is characterized by comprising the following steps of:
1) obtaining the system capacitance current value I obtained by the test of the test instrument1；
2) At the system capacitance current value I1Greater than a preset threshold A and a system capacitance current value I1Is located in [ Imin,Imax) In the range, the transformer substation is provided with an arc extinction device and a system capacitance current value I1And the capacitance current value I detected by the arc extinction device0The difference between them is (0, A)]The existing arc suppression devices of the transformer substation are judged to meet overcompensation and meet the capacity requirement under the condition that the range is established simultaneously, and arc suppression devices do not need to be additionally arranged; wherein, IminMinimum compensation current for arc-extinguishing means, ImaxThe maximum compensation current of the arc extinction device.
2. The intelligent diagnosis and early warning method for the capacitance and current of the transformer substation as claimed in claim 1, wherein step 2) further comprises obtaining a system capacitance and current value I1Greater than a preset threshold A and a system capacitance current value I1Is located in [ Imin,Imax) In the range, the transformer substation is provided with an arc extinction device and a system capacitance current value I1And the capacitance current value I detected by the arc extinction device0The difference between them is (0, A)]The following processing steps are carried out under the condition that the ranges are out of the range simultaneously: judging whether the arc extinction device has a step difference and a gear, if so, calculating to meet the condition I according to the step difference K and the gear M of the arc extinction devicemin+(N-1)*K≤I1＜IminAnd positive integer N which is + N × K and N is less than or equal to M, judging whether a measurer of the arc extinction device and a controller need to be checked to determine whether faults exist, and shifting the gear of the arc extinction device to N gear to meet overcompensation.
3. The intelligent diagnosis and early warning method for the capacitance and current of the transformer substation as claimed in claim 2, wherein after judging whether the transformer has a step difference and a gear, the method further comprises judging whether a measurer needing to check the arc suppression device has a fault or not under the condition that the transformer has no step difference and gear, and adjusting the gear of the arc suppression device to a proper gear to meet the overcompensation, wherein the overcompensation current is less than or equal to a preset threshold A.
4. The intelligent diagnosis and early warning method for the capacitance and current of the transformer substation as claimed in claim 3, wherein the step 2) further comprises the step of obtaining the system capacitance and current value I1Greater than a preset threshold A and a system capacitance current value I1Less than minimum compensation current I of arc-extinguishing deviceminSystem capacitance current value I1And minimum compensation current I of arc extinction deviceminThe difference between them is (0, A)]And under the condition that the ranges are simultaneously established, judging whether the gear of the arc extinction device needs to be checked to be positioned at the lowest gear or not, and if not, adjusting the arc extinction device to the lowest gear to meet the overcompensation.
5. The intelligent diagnosis and early warning method for the capacitance and current of the transformer substation as claimed in claim 4, wherein the step 2) further comprises the step of obtaining the system capacitance and current value I1Greater than a preset threshold A and a system capacitance current value I1Less than minimum compensation current I of arc-extinguishing deviceminSystem capacitance current value I1And minimum compensation current I of arc extinction deviceminThe difference between them is (0, A)]Under the condition that the range is simultaneously satisfied, the capacity of the arc extinction device is judged to be too large, and the arc extinction device with the capacity being the optimal capacity W is suggested to be selected.
6. The intelligent diagnosis and early warning method for the capacitance and current of the transformer substation as claimed in claim 5, wherein the step 2) further comprises the step of obtaining the system capacitance and current value I1Greater than a preset threshold A and a system capacitance current value I1More than or equal to minimum compensation current I of arc suppression deviceminAt the same time, under the condition of establishment, the capacity of the arc suppression device is judged to be too small, and the arc suppression device is suggested to be additionally arranged, so that the transformer can be usedThe sum of the capacities of all arc suppression devices satisfies the optimum capacity W.
7. The intelligent diagnosis and early warning method for the capacitance and current of the transformer substation as claimed in claim 6, wherein the calculation function expression of the optimal capacity W is as follows:
Figure FDA0003084884140000021
in the above formula, ICFor grounding capacitive current, UnIs the system nominal voltage.
8. The intelligent diagnosis and early warning method for the capacitance and current of the transformer substation as claimed in claim 7, wherein the step 2) further comprises the step of obtaining the system capacitance and current value I1Under the condition that the value is less than or equal to a preset threshold value A, judging that an arc extinction device needs to be additionally installed or quit; step 2) also comprises a system capacitance current value I1And judging that arc suppression devices are added under the condition that the sum of the capacities of all the arc suppression devices of the transformer meets the optimal capacity W when the sum is larger than the preset threshold A and the arc suppression devices are not installed in the transformer substation.
9. An intelligent diagnosis and early warning system for the capacitance and current of a transformer substation, which comprises a microprocessor and a memory which are connected with each other, and is characterized in that the microprocessor is programmed or configured to execute the steps of the intelligent diagnosis and early warning method for the capacitance and current of the transformer substation as claimed in any one of claims 1-8.
10. A computer-readable storage medium, wherein a computer program programmed or configured to execute the intelligent substation capacitive current diagnosis and warning method according to any one of claims 1 to 8 is stored in the computer-readable storage medium.
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