Method and system for evaluating health of digital extra-high voltage GIS (Gas Insulated Switchgear) equipment

Abstract

The invention relates to a health evaluation method and system for digital extra-high voltage GIS equipment, and belongs to the technical field of electric power. The method comprises the following steps: firstly, acquiring a specific value of an inspection item, influencing the health state of the equipment, of a certain part of the GIS equipment, and obtaining an influence factor and a degradation degree corresponding to each inspection item in combination with a judgment basis corresponding to each inspection item of the part; obtaining the health state of the part according to the influence factor and the deterioration degree corresponding to each inspection item of the part; and finally, evaluating the health state of the GIS equipment according to the health state of each part. And operation and maintenance personnel in the substation are helped to timely discover abnormal conditions of the GIS equipment and rapidly carry out troubleshooting processing, so that stable operation of the extra-high voltage substation is improved.

Description

Technical Field

[0001] The present invention relates to a method and system for health assessment of GIS equipment for digital ultra-high voltage, belonging to the field of electric power technology. Background Art

[0002] Gas Insulated Switchgear (GIS) consists of circuit breakers, disconnectors, earthing switches, current transformers, voltage transformers, arresters, busbars, connectors, outgoing terminals, etc. All these devices or components are completely enclosed in a metal earthed enclosure, and a certain pressure of SF6 insulating gas is filled inside. The health status of GIS equipment is of great significance to the stable operation of ultra-high voltage substations.

[0003] With the construction and development of smart grids, a large number of gas-insulated combined electrical equipment (GIS) are used in substations above 35 kV of the power grid, which puts forward higher requirements for equipment condition monitoring and intelligent operation and maintenance. According to the statistics of the operation years of the equipment, most of the defects of GIS equipment are due to poor product quality, mainly reflected in abnormal SF6 insulating gas pressure, more leakage faults occurring within 6 - 10 years after the operation of GIS equipment, and component damage defects, such as multiple heater damage defects. The proportion of GIS circuit breakers in the power grid company that have been in operation for 10 years and above is relatively large, and the monitoring and early warning capabilities for the operation status monitoring and defect hidden dangers of GIS equipment are not strong.

[0004] When there was no digital platform in ultra-high voltage substations, the data obtained for GIS equipment was scarce and scattered, resulting in the problems that the health assessment of GIS equipment was not centrally summarized and the health assessment of GIS equipment was inaccurate. Currently, the digital ultra-high voltage system realizes the convergence of the whole station data. As Figure 1 shown, the GIS equipment-related data in the security zone I is forwarded to the digital platform in the security zone IV through a firewall and a forward isolation device, but these data are not fully utilized, and there is a lack of a method for comprehensive health assessment of GIS equipment in digital ultra-high voltage substations. Summary of the Invention

[0005] The purpose of the present invention is to provide a method and system for health assessment of GIS equipment for digital ultra-high voltage, so as to solve the problems that the health assessment of GIS equipment in ultra-high voltage substations is not centrally summarized and the health assessment of GIS equipment is inaccurate due to the lack of GIS equipment data information.

[0006] To achieve the above purpose, the solution of the present invention includes:

[0007] The present invention provides a method for health assessment of GIS equipment for digital ultra-high voltage, and the method includes:

[0008] 1) Obtain the health status of each component of the GIS device; among them, the health status of any component of the GIS device is obtained in the following manner:

[0009] Obtain the specific value of the inspection item that affects the health status of a certain component of the GIS device, and combine it with the judgment basis corresponding to each inspection item of the component to obtain the influence factor and deterioration degree corresponding to each inspection item. The deterioration degree reflects the severity of the inspection item of the component, and the influence factor reflects the degree of influence of the severity of the inspection item on the device; obtain the health status of the component according to the influence factor and deterioration degree corresponding to each inspection item of the component.

[0010] 2) Conduct a health status evaluation of the GIS device according to the health status of each component.

[0011] Furthermore, the method for obtaining the health status of the component according to the influence factor and deterioration degree corresponding to each inspection item of the component is: obtain the basic deduction score corresponding to each inspection item according to the basic deduction score corresponding to each deterioration degree, multiply the basic deduction score corresponding to each inspection item by the influence factor to obtain the single-item deduction score corresponding to each inspection item, and determine the health status of the component according to the single-item deduction score of each inspection item and the range to which the total deduction score of all inspection items of the component belongs.

[0012] Furthermore, the health status of each component includes a normal state, a caution state, an abnormal state, and a severe state, and the severity of the component health status increases in turn; when all single-item deduction scores in the inspection items of the component are less than the first threshold and the total deduction score of the inspection items is less than the fourth threshold, the health status of the component is the normal state; when the health status of the component is not the severe state or the abnormal state, and a certain single-item deduction score in the inspection items of the component is greater than or equal to the first threshold and less than the second threshold or the total deduction score of the detection items is greater than or equal to the fourth threshold, the health status of the component is the caution state; when the health status of the component is not the severe state, and a certain single-item deduction score in the inspection items of the component is greater than or equal to the second threshold and less than the third threshold, the health status of the component is the abnormal state; when a certain single-item deduction score in the inspection items of the component is greater than or equal to the third threshold, the health status of the component is the severe state; where the first threshold < the second threshold < the third threshold, and the fourth threshold is greater than the first threshold.

[0013] Furthermore, the method for conducting a health status evaluation of the GIS device according to the health status of each component is: when the health status of all components is the normal state, the health status of the GIS device is normal; when the health status of any component is the abnormal state, the health status of the GIS device is the most severe state among them.

[0014] Further, the inspection items corresponding to the body components of the GIS device include: on-line SF6 gas chamber pressure, off-line SF6 gas chamber pressure, SF6 gas chamber gas replenishment time, body corrosion, grounding connection corrosion, foundation damage, support damage, cumulative short-circuit breaking current value, statistical switch operation times, off-line recorded switch operation times, and one, two, or at least three of the family defects of the body.

[0015] Further, the inspection items corresponding to the operating mechanism components of the GIS device include: pressurization time, number of pressurizations in 24 hours, number of monthly off-line pressurizations, mechanism pressure, motor current, oil pump oil level, mechanism box deformation, mechanism box corrosion, and one, two, or at least three of the family defects of the operating mechanism.

[0016] Further, the inspection items corresponding to the shunt capacitor components of the GIS device include: porcelain bushing pollution of the shunt capacitor, porcelain bushing damage of the shunt capacitor, porcelain bushing discharge of the shunt capacitor, and one, two, or at least three of the family defects of the shunt capacitor.

[0017] Further, the inspection items corresponding to the closing resistor components of the GIS device include: porcelain bushing pollution of the closing resistor, porcelain bushing damage of the closing resistor, porcelain bushing discharge of the closing resistor, and one, two, or at least three of the family defects of the closing resistor.

[0018] The beneficial effects of the present invention are as follows: A method for health assessment of GIS devices for digital UHV constructed by the present invention obtains specific values of inspection items affecting the health status of various components of GIS devices by aggregating a large amount of data in the digital UHV system. Through the method provided by the present invention, according to the judgment basis corresponding to each inspection item of each component, the influence factor and deterioration degree corresponding to each inspection item are obtained, the health status of each component of the GIS device is obtained, and then the health status of the GIS device is obtained, improving the accuracy of the judgment of the health status of the GIS device. It realizes the evaluation of the health status of GIS devices by multi-parameters and multi-algorithms, and prompts the equipment warning information to the operation and maintenance personnel, helping the on-site operation and maintenance personnel to timely discover abnormal situations of GIS devices and quickly conduct troubleshooting and handling, greatly improving the stable operation of UHV substations.

[0019] The present invention also provides a health assessment system for GIS devices for digital UHV, including a processor for executing a computer program to implement the steps of the above-mentioned health assessment method for GIS devices for digital UHV.

[0020] The health assessment system for GIS devices for digital UHV can achieve the same beneficial effects as the above-mentioned health assessment method for GIS devices for digital UHV. Description of the Drawings

[0021] Figure 1It is the overall architecture diagram of the digital UHV substation system;

[0022] Figure 2 It is the flow chart of the GIS equipment health assessment method for digital UHV of the present invention. Detailed implementation manners

[0023] To make the objectives, technical solutions and advantages of the present invention clearer and more understandable, the present invention will be described in detail clearly and completely below in conjunction with the accompanying drawings and embodiments.

[0024] The concept of the present invention lies in constructing a GIS equipment health assessment method and system for digital UHV. Under the digital UHV system, specific values of inspection items that affect the equipment health status of each component of the GIS equipment are obtained in a concentrated manner. Through the method provided by the present invention, combined with the judgment basis corresponding to each inspection item of the component, the influence factor and the deterioration degree corresponding to each inspection item are obtained. The deduction value corresponding to each inspection item is obtained by multiplying the basic deduction score corresponding to each deterioration degree by the influence factor. The health status of the component is determined according to the range to which the single-item deduction value of each inspection item and the total deduction value of all inspection items of the component belong, and then the health status of the GIS equipment is obtained, improving the accuracy of the judgment of the health status of the GIS equipment. It realizes the evaluation of the health status of GIS equipment with multiple parameters and multiple algorithms, and gives warning information of the equipment to the operation and maintenance personnel, helping the in-station operation and maintenance personnel to timely discover abnormal situations of GIS equipment and quickly conduct investigation and treatment, greatly improving the stable operation of UHV substations.

[0025] Embodiment of the GIS equipment health assessment method for digital UHV:

[0026] This embodiment provides a GIS equipment health assessment method for digital UHV, diagnoses GIS faults based on multi-parameter data related to GIS equipment collected by a digital platform, uses threshold crossing, three-item comparison, longitudinal historical comparison, and annual air leakage rate algorithm as judgment bases, divides influence factors and deterioration degrees, and constructs a GIS equipment evaluation model; through deterioration degree grading, the score corresponding to each level is multiplied by the value of the corresponding influence factor as the deduction value of each component and the whole of the GIS equipment, and the health assessment of the GIS equipment is obtained according to the size of the deduction value.

[0027] As Figure 2 shown, the specific GIS equipment health assessment method for digital UHV is as follows:

[0028] S1. Obtain specific values of inspection items that affect the equipment health status of a certain component of the GIS equipment;

[0029] S2. According to the judgment basis corresponding to each inspection item of the component, obtain the influence factor and the deterioration degree corresponding to each inspection item;

[0030] S3. Multiply the basic deduction points corresponding to each degree of deterioration by the influence factor to obtain the deduction points corresponding to each inspection item.

[0031] S4. Determine the health status of the component according to the single-item deduction points of each inspection item and the range to which the total deduction points of all inspection items of the component belong.

[0032] S5. The health assessment of the GIS device is comprehensively evaluated based on the status results of each component. When the health status of all components is normal, the health status of the GIS device is normal; when the health status of any component is abnormal, the health status of the GIS device is the most serious status among them.

[0033] Through this method process, the health status of the GIS device is evaluated by multiple parameters and multiple algorithms, and the device warning information is prompted to the operation and maintenance personnel, helping the in-station operation and maintenance personnel to promptly discover the abnormal situation of the GIS device and quickly conduct troubleshooting and handling, greatly improving the stable operation of the UHV substation.

[0034] In step S1, relevant data of the GIS device is collected through the digital platform, and its overall architecture is as Figure 1 shown. First, the measuring and controlling device located in security zone I collects relevant teleinformation, telemetry, etc. data of the GIS device. These data are forwarded by the data aggregation server in zone I to the digital platform located in security zone IV through the firewall and the forward isolation device. At the same time, some GIS device data manually recorded, including the item of the number of offline switch operation records in the operation life of the main body and the item of the monthly offline pressure boost times in the mechanism energy storage of the operating mechanism, etc., are imported into the digital platform in security zone IV through the offline import method; the data processing service in the digital platform stores the real-time changing data into the real-time database, and the historical storage service stores the data into the historical database; combining the data in the real-time database and the historical database, the GIS diagnosis module uses multi-parameter data and uses multiple algorithms for fault diagnosis, including threshold overrun, three-phase comparison, longitudinal historical comparison, and annual air leakage rate algorithm; build a GIS device evaluation model, summarize the diagnosis results of each algorithm of the GIS diagnosis module, score each component and the whole of the GIS device, and give a comprehensive health evaluation of the GIS device according to the results.

[0035] In step S2, according to the judgment basis corresponding to each inspection item of the component, obtain the influence factor and the degree of deterioration corresponding to each inspection item, and build a GIS device evaluation model as shown in the following table:

[0036]

[0037]

[0038]

[0039] The GIS equipment is divided into four components: the main body, the operating mechanism, the shunt capacitor, and the closing resistor. Each component corresponds to one or more major inspection items, each major inspection item corresponds to one or more minor inspection items, and each minor inspection item has corresponding judgment bases. Based on the data collected by the digital platform, fault diagnosis or algorithm judgment and early warning are carried out.

[0040] According to the severity of each result and the degree of influence on the equipment in the judgment basis, there are corresponding different influence factors and deterioration degrees, and based on this result, the deduction scores of the minor inspection items, major inspection items, components, and the overall equipment are calculated respectively to form a comprehensive health evaluation conclusion for the GIS equipment.

[0041] Among them, the deterioration degree classification is shown in the following table (setting the corresponding basic deduction scores for the deterioration degree classification, not limited to the following table, and can be set according to the higher the deterioration degree level, the greater the basic deduction score):

[0042] Degree of deterioration Level I Level II Level III Level IV Basic deduction score 2 4 8 10

[0043] Furthermore, in step 3, the deduction scores of each item in the judgment basis are jointly determined by the influence factor and the deterioration degree. When the state is normal, no deduction is made; when the state is abnormal, the deduction score corresponding to each inspection item is obtained by multiplying the basic deduction corresponding to each deterioration degree by the influence factor:

[0044] Deduction score of the state quantity = Basic deduction score × Influence factor

[0045] The component scoring should consider the total deduction of the major inspection items, minor inspection items, and components at the same time. The health status of the component is determined according to the single deduction score of each inspection item and the range to which the total deduction score of all inspection items of the component belongs. The component status evaluation criteria are as follows in the table. In this embodiment, the first threshold is set to 12, the second threshold is set to 20, the third threshold is set to 30, the fourth threshold of the main body component is set to 30, and the fourth threshold of the components other than the main body is set to 20:

[0046]

[0047] Among them, the evaluation criteria for the status of each component include normal status, attention status, abnormal status, and serious status, and the severity of the health status of the components increases in turn; when the deduction score of each individual item in the inspection items of the main body component is less than 12 and the total deduction score of the inspection items is less than 30, the health status of the main body component is in the normal status; when the health status of the main body component is not in the serious status or abnormal status, and the deduction score of a certain individual item in the inspection items of the main body component is greater than or equal to 12 and less than 20, or the total deduction score of the detection items is greater than or equal to 30, the health status of the main body component is in the attention status; when the health status of the main body component is not in the serious status, and the deduction score of a certain individual item in the inspection items of the main body component is greater than or equal to 20 and less than 30, the health status of the main body component is in the abnormal status; when the deduction score of a certain individual item in the inspection items of the main body component is greater than or equal to 30, the health status of the main body component is in the serious status.

[0048] When the deduction score of each individual item in the inspection items of the components other than the main body is less than 12 and the total deduction score of the inspection items is less than 20, the health status of the components other than the main body is in the normal status; when the health status of the components other than the main body is not in the serious status or abnormal status, and the deduction score of a certain individual item in the inspection items of the components other than the main body is greater than or equal to 12 and less than 20, or the total deduction score of the detection items is greater than or equal to 20, the health status of the components other than the main body is in the attention status; when the health status of the components other than the main body is not in the serious status, and the deduction score of a certain individual item in the inspection items of the components other than the main body is greater than or equal to 20 and less than 30, the health status of the components other than the main body is in the abnormal status; when the deduction score of a certain individual item in the inspection items of the components other than the main body is greater than or equal to 30, the health status of the components other than the main body is in the serious status.

[0049] In step S5, a comprehensive evaluation of the health of the GIS device is performed according to the status results of each component. When the health status of all components is in the normal status, the health status of the GIS device is normal; when the health status of any component is in the abnormal status, the health status of the GIS device is the most serious status among them.

[0050] Embodiment of a GIS device health evaluation system for digital UHV:

[0051] This embodiment provides a technical solution for a GIS device health evaluation system for digital UHV, including a processor, which is used to execute a computer program to implement the steps of the above-mentioned GIS device health evaluation method for digital UHV.

[0052] Through the GIS device health evaluation system for digital UHV in this embodiment, it is possible to evaluate the health status of the GIS device with multiple parameters and multiple algorithms, and prompt the maintenance personnel with device warning information, helping the on-site maintenance personnel to detect abnormal situations of the GIS device in time and quickly conduct troubleshooting and handling, which greatly improves the stable operation of the UHV substation.

[0053] Since the specific implementation process and principle of the GIS equipment health evaluation system for digital UHV in this embodiment have been described in detail in the embodiment of the GIS equipment health evaluation method for digital UHV, no further elaboration will be provided here.

Claims

1. A method for health assessment of digital UHV GIS equipment, characterized in that: The method includes: 1) Obtain the health status of each component of the GIS device; the health status of any component of the GIS device is obtained as follows: Obtain the specific values ​​of the inspection items that affect the health status of a certain component of the GIS equipment, and combine the judgment basis corresponding to each inspection item of the component to obtain the corresponding influence factor and degradation degree of each inspection item. The degradation degree reflects the severity of the inspection item of the component, and the influence factor reflects the influence of the severity of the inspection item on the equipment; obtain the health status of the component according to the influence factor and degradation degree corresponding to each inspection item of the component; 2) Evaluate the health status of GIS equipment based on the health status of each component.

2. The GIS equipment health assessment method for digital UHV according to claim 1 is characterized in that: The method for obtaining the health status of the component based on the influencing factor and degradation degree corresponding to each inspection item of the component is as follows: obtain the basic deduction value corresponding to each inspection item based on the basic deduction value corresponding to each degradation degree, multiply the basic deduction value corresponding to each inspection item by the influencing factor to obtain the single deduction value corresponding to each inspection item, and determine the health status of the component based on the range to which the single deduction value of each inspection item and the total deduction value of all inspection items of the component belong.

3. The GIS equipment health assessment method for digital UHV according to claim 2 is characterized in that: The health status of each component includes normal status, caution status, abnormal status and severe status, and the severity of the health status of the component increases in sequence; when the deduction value of each single item in the inspection item of the component is less than the first threshold and the total deduction value of the inspection item is less than the fourth threshold, the health status of the component is normal; When the health status of the component is not a serious status or an abnormal status, and the deduction value of a single item in the inspection items of the component is greater than or equal to the first threshold and less than the second threshold, or the total deduction value of the inspection items is greater than or equal to the fourth threshold, the health status of the component is a caution status; When the health status of the component is not in a serious state, and a single deduction value in the inspection items of the component is greater than or equal to the second threshold and less than the third threshold, the health status of the component is an abnormal state; when a single deduction value in the inspection items of the component is greater than or equal to the third threshold, the health status of the component is a serious state; wherein the first threshold < the second threshold < the third threshold, and the fourth threshold is greater than the first threshold.

4. The method for health assessment of digital UHV GIS equipment according to claim 3, characterized in that: The way to evaluate the health status of GIS equipment according to the health status of each component is: when the health status of all components is normal, the health status of GIS equipment is normal; when the health status of any component is abnormal, the health status of GIS equipment is the most serious one.

5. The method for health assessment of digital UHV GIS equipment according to any one of claims 1 to 4, characterized in that: The inspection items corresponding to the main components of GIS equipment include: online SF6 gas chamber pressure, offline SF6 gas chamber pressure, SF6 gas chamber refilling time, body corrosion, ground connection corrosion, foundation damage, bracket damage, cumulative breaking short-circuit current value, statistical switch action times, offline recording switch action times and one, two or at least three of the family defects of the body.

6. The method for health assessment of digital UHV GIS equipment according to any one of claims 1 to 4, characterized in that: The inspection items corresponding to the operating mechanism components of GIS equipment include: pressurization time, number of pressurization times in 24 hours, number of offline monthly pressurization times, mechanism pressure, motor current, oil pump oil level, mechanism box deformation, mechanism box rust and one, two or at least three of the family defects of the operating mechanism.

7. The method for health assessment of digital UHV GIS equipment according to any one of claims 1 to 4, characterized in that: The inspection items corresponding to the parallel capacitor components of GIS equipment include: one, two or at least three of the following: porcelain sleeve contamination of the parallel capacitor, porcelain sleeve damage of the parallel capacitor, porcelain sleeve discharge of the parallel capacitor and family defects of the parallel capacitor.

8. The method for health assessment of digital UHV GIS equipment according to any one of claims 1 to 4, characterized in that: The inspection items corresponding to the closing resistor components of the GIS equipment include: one, two or at least three of the following: porcelain sleeve contamination of the closing resistor, porcelain sleeve damage of the closing resistor, porcelain sleeve discharge of the closing resistor and family defects of the closing resistor.

9. A GIS equipment health evaluation system for digital UHV, comprising a processor, characterized in that: The processor is used to execute a computer program to implement the steps of the health assessment method for digital ultra-high voltage GIS equipment according to any one of claims 1 to 8.

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