Converter transformer tap switch assembly state evaluation and fault diagnosis positioning method, device and equipment and storage medium

Abstract

The invention discloses a converter transformer tap switch assembly state evaluation method and system, and belongs to the technical field of converter transformer fault diagnosis. The method comprises the following steps: acquiring multi-type data of a converter transformer, and determining multiple indexes for state evaluation of a tap switch assembly; according to the multi-type data, based on an artificial intelligence model and a digital twinborn model, determining multiple index values for state evaluation of the tap switch assembly; and judging the multiple index values, and determining the state of the tap switch of the converter transformer based on a judgment result. According to the application of the method, various faults of the converter transformer can be judged conveniently and efficiently.

Description

Technical Field

[0001] The present invention relates to the technical field of converter transformer fault diagnosis, and more particularly, to a method and system for evaluating the state of a converter transformer tap switch assembly. Background Art

[0002] The tap changer is used to connect and disconnect the transformer winding joints to achieve the functions of converter transformer ratio adjustment, load adjustment, and overload prevention. The health status of the tap changer components will directly affect the safe and stable operation of the converter transformer. During the operation of the converter transformer, the tap changer is prone to defects such as mechanism jamming, contact mechanical wear, weakening of the spring elasticity of the fast mechanism, mechanical hysteresis of the common main drive shaft, leakage of the tap changer oil chamber, abnormal gear feeding, control circuit failure or transmission chain failure, abnormal discharge of the switching core or secondary circuit abnormality. Summary of the invention

[0003] In view of the above problems, the present invention proposes a method for evaluating the state of a converter transformer tap changer assembly, comprising:

[0004] Obtain multiple types of data from converter transformers and determine multiple indicators for tap changer component status evaluation;

[0005] According to the multi-type data, based on the artificial intelligence model and the digital twin model, multiple indicator values ​​for tap changer component status evaluation are determined;

[0006] The multiple indicator values ​​are judged, and based on the judgment result, the state of the converter transformer tap changer is determined.

[0007] Optional, multiple types of data, including: online monitoring data, offline monitoring data, power outage test data and inspection data.

[0008] Optional, multiple indicators, including: motor current, vibration signal envelope, mechanical wear, spring elasticity, pulses corresponding to separation and closure of main contacts, mechanical hysteresis of drive shaft when vibration pulse signals become wider, small oil pillow oil level gauge, trace water content.

[0009] Optionally, judging the multiple indicator values ​​and determining the state of the converter transformer tap changer based on the judgment result includes:

[0010] If the motor current increase value is higher than the threshold value D1, it is determined that the mechanism jamming state of the converter transformer tap switch is an abnormal state;

[0011] If the linear growth of the vibration signal envelope exceeds the threshold value D2 and the mechanical wear degree value exceeds the threshold value D5, it is determined that the mechanical wear state of the converter transformer tap changer is an abnormal state;

[0012] If the linear growth of the vibration signal envelope exceeds the threshold value D2 and the mechanical wear degree value exceeds the threshold value D5, it is determined that the mechanical wear state of the converter transformer tap changer is a serious fault state;

[0013] If the increase in the pulse interval corresponding to the separation and closing of the main contacts is higher than the threshold value D3, the decrease in the pulse amplitude corresponding to the separation and closing of the main contacts exceeds the threshold value D4, and the spring elasticity value exceeds the threshold value D7, then it is determined that the spring elasticity state of the converter transformer tap changer is an abnormal state;

[0014] If the increase in the pulse interval corresponding to the separation and closing of the main contacts exceeds the threshold value D3, the decrease in the pulse amplitude corresponding to the separation and closing of the main contacts exceeds the threshold value D4, and the spring elasticity value exceeds the threshold value D7, then the spring elasticity state of the converter transformer tap changer is determined to be a serious fault state;

[0015] If the hysteresis value of the drive shaft machinery exceeds the threshold value D9 when the vibration pulse signals are all widened, it is determined that the mechanical state of the main drive shaft of the converter transformer tap changer is abnormal;

[0016] If the hysteresis value of the drive shaft machinery exceeds the threshold value D10 when the vibration pulse signals are all widened, it is determined that the mechanical state of the main drive shaft of the converter transformer tap changer is a serious fault state;

[0017] If the oil level gauge of the small oil pillow drops beyond the threshold value D11, the oil level rises beyond the threshold value D12, or the trace water content exceeds the threshold value D13, it is determined that the oil chamber leakage state of the converter transformer tap changer is abnormal;

[0018] If the oil level gauge of the small oil pillow drops beyond the threshold value D14 or the oil level rises beyond the threshold value D15, it is determined that the oil chamber leakage state of the converter transformer tap changer is a serious fault state.

[0019] Optionally, the method further includes:

[0020] According to the inspection data in the multi-type data, based on the artificial intelligence model and the digital twin model, the status of the tap changer gear, control circuit, transmission chain and switching core is determined, including:

[0021] If the artificial intelligence model and the digital twin model determine based on the inspection data that the motor is running normally, the gear is abnormal, and the gear of the tap changer is out of step, then the gear state of the tap changer is determined to be the gear up abnormal state;

[0022] If it is determined that the motor does not rotate, the gear position is abnormal, and the tap changer gear position is out of step after the control command is issued, it is determined that the state of the tap changer control circuit or the rotation chain state is abnormal, and the converter transformer is in an abnormal state;

[0023] If it is determined that the pressure relief valve is actuated or the pressure relay is actuated, and it is determined that the switching core of the tap changer or the state of the secondary circuit is abnormal, then the converter transformer is in an abnormal state;

[0024] If it is determined that the pressure relief valve or the pressure relay is actuated and the status of the secondary circuit is normal, the converter transformer is in a serious fault state.

[0025] In another aspect, the present invention further provides a system for evaluating the state of a converter transformer tap changer assembly, comprising:

[0026] A data acquisition unit, used to obtain multiple types of data of the converter transformer and determine multiple indicators for the status evaluation of the tap changer assembly;

[0027] A calculation unit, configured to determine, according to the multi-type data, a plurality of index values ​​for evaluating the state of the tap changer assembly based on an artificial intelligence model and a digital twin model;

[0028] The judging unit is used to judge the multiple indicator values ​​and determine the state of the converter transformer tap changer based on the judgment result.

[0029] Optional, multiple types of data, including: online monitoring data, offline monitoring data, power outage test data and inspection data.

[0030] Optional, multiple indicators, including: motor current, vibration signal envelope, mechanical wear, spring elasticity, pulses corresponding to separation and closure of main contacts, mechanical hysteresis of drive shaft when vibration pulse signals become wider, small oil pillow oil level gauge, trace water content.

[0031] Optionally, judging the multiple indicator values ​​and determining the state of the converter transformer tap changer based on the judgment result includes:

[0032] If the motor current increase value is higher than the threshold value D1, it is determined that the mechanism jamming state of the converter transformer tap switch is an abnormal state;

[0033] If the linear growth of the vibration signal envelope exceeds the threshold value D2 and the mechanical wear degree value exceeds the threshold value D5, it is determined that the mechanical wear state of the converter transformer tap changer is an abnormal state;

[0034] If the linear growth of the vibration signal envelope exceeds the threshold value D2 and the mechanical wear degree value exceeds the threshold value D5, it is determined that the mechanical wear state of the converter transformer tap changer is a serious fault state;

[0035] If the increase in the pulse interval corresponding to the separation and closing of the main contacts is higher than the threshold value D3, the decrease in the pulse amplitude corresponding to the separation and closing of the main contacts exceeds the threshold value D4, and the spring elasticity value exceeds the threshold value D7, then it is determined that the spring elasticity state of the converter transformer tap changer is an abnormal state;

[0036] If the increase in the pulse interval corresponding to the separation and closing of the main contacts exceeds the threshold value D3, the decrease in the pulse amplitude corresponding to the separation and closing of the main contacts exceeds the threshold value D4, and the spring elasticity value exceeds the threshold value D7, then the spring elasticity state of the converter transformer tap changer is determined to be a serious fault state;

[0037] If the hysteresis value of the drive shaft machinery exceeds the threshold value D9 when the vibration pulse signals are all widened, it is determined that the mechanical state of the main drive shaft of the converter transformer tap changer is abnormal;

[0038] If the hysteresis value of the drive shaft machinery exceeds the threshold value D10 when the vibration pulse signals are all widened, it is determined that the mechanical state of the main drive shaft of the converter transformer tap changer is a serious fault state;

[0039] If the oil level gauge of the small oil pillow drops beyond the threshold value D11, the oil level rises beyond the threshold value D12, or the trace water content exceeds the threshold value D13, it is determined that the oil chamber leakage state of the converter transformer tap changer is abnormal;

[0040] If the oil level gauge of the small oil pillow drops beyond the threshold value D14 or the oil level rises beyond the threshold value D15, it is determined that the oil chamber leakage state of the converter transformer tap changer is a serious fault state.

[0041] Optionally, the judging unit is further configured to:

[0042] According to the inspection data in the multi-type data, based on the artificial intelligence model and the digital twin model, the status of the tap changer gear, control circuit, transmission chain and switching core is determined, including:

[0043] If the artificial intelligence model and the digital twin model determine based on the inspection data that the motor is running normally, the gear is abnormal, and the gear of the tap changer is out of step, then the gear state of the tap changer is determined to be the gear up abnormal state;

[0044] If it is determined that the motor does not rotate, the gear position is abnormal, and the tap changer gear position is out of step after the control command is issued, it is determined that the state of the tap changer control circuit or the rotation chain state is abnormal, and the converter transformer is in an abnormal state;

[0045] If it is determined that the pressure relief valve is actuated or the pressure relay is actuated, and it is determined that the switching core of the tap changer or the state of the secondary circuit is abnormal, then the converter transformer is in an abnormal state;

[0046] If it is determined that the pressure relief valve or the pressure relay is actuated and the status of the secondary circuit is normal, the converter transformer is in a serious fault state.

[0047] In yet another aspect, the present invention further provides a computing device, comprising: one or more processors;

[0048] a processor for executing one or more programs;

[0049] When the one or more programs are executed by the one or more processors, the above-described method is implemented.

[0050] In yet another aspect, the present invention further provides a computer-readable storage medium having a computer program stored thereon, wherein when the computer program is executed, the method described above is implemented.

[0051] Compared with the prior art, the present invention has the following beneficial effects:

[0052] The present invention provides a method for evaluating the state of a converter transformer tap switch assembly, comprising: obtaining multiple types of data of the converter transformer and determining multiple indicators for evaluating the state of the tap switch assembly; determining multiple indicator values ​​for evaluating the state of the tap switch assembly based on the multiple types of data and an artificial intelligence model and a digital twin model; judging the multiple indicator values, and determining the state of the converter transformer tap switch based on the judgment result. The application of the present invention can judge multiple faults of the converter transformer, which is convenient and efficient. BRIEF DESCRIPTION OF THE DRAWINGS

[0053] Figure 1 is a flow chart of the method of the present invention;

[0054] Figure 2 It is the principle diagram of the method of the present invention;

[0055] Figure 3 is a flow chart of an embodiment of the method of the present invention;

[0056] Figure 4 It is a structural diagram of the system of the present invention. DETAILED DESCRIPTION

[0057] Now, exemplary embodiments of the present invention are described with reference to the accompanying drawings. However, the present invention can be implemented in many different forms and is not limited to the embodiments described herein. These embodiments are provided to disclose the present invention in detail and completely and to fully convey the scope of the present invention to those skilled in the art. The terms used in the exemplary embodiments shown in the accompanying drawings are not intended to limit the present invention. In the accompanying drawings, the same units / elements are marked with the same reference numerals.

[0058] Unless otherwise specified, the terms (including technical terms) used herein have the commonly understood meanings to those skilled in the art. In addition, it is understood that the terms defined in commonly used dictionaries should be understood to have the same meanings as those in the context of the relevant fields, and should not be understood as idealized or overly formal meanings.

[0059] Embodiment 1:

[0060] The present invention proposes a method for evaluating the state of a converter transformer tap changer assembly, such as Figure 1 As shown, including:

[0061] Step 1, obtaining multiple types of data of the converter transformer and determining multiple indicators for evaluating the state of the tap changer assembly;

[0062] Step 2: Determine multiple index values ​​for evaluating the state of the tap changer assembly based on the multi-type data, an artificial intelligence model and a digital twin model;

[0063] Step 3: judging the multiple indicator values, and determining the state of the converter transformer tap changer based on the judgment result.

[0064] Among them, there are multiple types of data, including: online monitoring data, offline monitoring data, power outage test data and inspection data.

[0065] Among them, there are many indicators, including: motor current, vibration signal envelope, mechanical wear, spring elasticity, pulses corresponding to separation and closure of main contacts, mechanical hysteresis of drive shaft when vibration pulse signals become wider, small oil pillow oil level gauge, and trace water content.

[0066] The step of judging the multiple index values ​​and determining the state of the converter transformer tap changer based on the judgment result includes:

[0067] If the motor current increase value is higher than the threshold value D1, it is determined that the mechanism jamming state of the converter transformer tap switch is an abnormal state;

[0068] If the linear growth of the vibration signal envelope exceeds the threshold value D2 and the mechanical wear degree value exceeds the threshold value D5, it is determined that the mechanical wear state of the converter transformer tap changer is an abnormal state;

[0069] If the linear growth of the vibration signal envelope exceeds the threshold value D2 and the mechanical wear degree value exceeds the threshold value D5, it is determined that the mechanical wear state of the converter transformer tap changer is a serious fault state;

[0070] If the increase in the pulse interval corresponding to the separation and closing of the main contacts is higher than the threshold value D3, the decrease in the pulse amplitude corresponding to the separation and closing of the main contacts exceeds the threshold value D4, and the spring elasticity value exceeds the threshold value D7, then it is determined that the spring elasticity state of the converter transformer tap changer is an abnormal state;

[0071] If the increase in the pulse interval corresponding to the separation and closing of the main contacts exceeds the threshold value D3, the decrease in the pulse amplitude corresponding to the separation and closing of the main contacts exceeds the threshold value D4, and the spring elasticity value exceeds the threshold value D7, then the spring elasticity state of the converter transformer tap changer is determined to be a serious fault state;

[0072] If the hysteresis value of the drive shaft machinery exceeds the threshold value D9 when the vibration pulse signals are all widened, it is determined that the mechanical state of the main drive shaft of the converter transformer tap changer is abnormal;

[0073] If the hysteresis value of the drive shaft machinery exceeds the threshold value D10 when the vibration pulse signals are all widened, it is determined that the mechanical state of the main drive shaft of the converter transformer tap changer is a serious fault state;

[0074] If the oil level gauge of the small oil pillow drops beyond the threshold value D11, the oil level rises beyond the threshold value D12, or the trace water content exceeds the threshold value D13, it is determined that the oil chamber leakage state of the converter transformer tap changer is abnormal;

[0075] If the oil level gauge of the small oil pillow drops beyond the threshold value D14 or the oil level rises beyond the threshold value D15, it is determined that the oil chamber leakage state of the converter transformer tap changer is a serious fault state.

[0076] The method further includes:

[0077] According to the inspection data in the multi-type data, based on the artificial intelligence model and the digital twin model, the status of the tap changer gear, control circuit, transmission chain and switching core is determined, including:

[0078] If the artificial intelligence model and the digital twin model determine based on the inspection data that the motor is running normally, the gear is abnormal, and the gear of the tap changer is out of step, then the gear state of the tap changer is determined to be the gear up abnormal state;

[0079] If it is determined that the motor does not rotate, the gear position is abnormal, and the tap changer gear position is out of step after the control command is issued, it is determined that the state of the tap changer control circuit or the rotation chain state is abnormal, and the converter transformer is in an abnormal state;

[0080] If it is determined that the pressure relief valve is actuated or the pressure relay is actuated, and it is determined that the switching core of the tap changer or the state of the secondary circuit is abnormal, then the converter transformer is in an abnormal state;

[0081] If it is determined that the pressure relief valve or the pressure relay is actuated and the status of the secondary circuit is normal, the converter transformer is in a serious fault state.

[0082] The present invention will be further described below in conjunction with the embodiments of the present invention:

[0083] Implementation principle Figure 2 The specific implementation steps are as shown in Figure 2 As shown, including:

[0084] Step 1: Tap changer mechanism jam defect diagnosis, status assessment and maintenance recommendations. If the motor current increase value is higher than the threshold D1 during online monitoring, it can be deduced that the tap changer mechanism is jammed, and the converter transformer operation status is assessed as "yellow code", which is in an abnormal state. The converter transformer can continue to operate, but it needs to be monitored more closely and the core should be checked in conjunction with the annual inspection.

[0085] Step 2: Diagnosis of mechanical wear defects of tap-changer contacts, status assessment and maintenance recommendations. If the horizontal and vertical analysis by artificial intelligence finds that the linear growth of the vibration signal envelope exceeds the threshold value D2, and the degree of mechanical wear exceeds the threshold value D5, it can be determined that the tap-changer has a mechanical wear defect of the contacts, and the converter transformer operation status assessment is "yellow code", which is in an abnormal operation state. The converter transformer can continue to operate, but it needs to be monitored more closely and the core hanging inspection should be carried out in conjunction with the annual inspection.

[0086] Furthermore, if the degree of mechanical wear exceeds the threshold value D6, the operating status of the converter transformer is evaluated as "red code" and is in a serious state. The operation and maintenance personnel should apply for shutdown in time and replace the switching core.

[0087] Step 3: Diagnosis of the spring elasticity weakening defect of the tap changer fast mechanism, status assessment and maintenance suggestions. If the artificial intelligence comprehensive analysis finds that the increase in the pulse interval corresponding to the separation and closure of the main contacts is higher than the threshold value D3, and the decrease in the pulse amplitude corresponding to the separation and closure of the main contacts is higher than the threshold value D4, it is necessary to detect the spring elasticity performance. If it exceeds the threshold value D7, it can be judged that the spring elasticity weakening defect of the tap changer fast mechanism occurs, the converter transformer is in an abnormal state, and the operating status assessment is "yellow code". The converter transformer can continue to operate, but it needs to strengthen monitoring and conduct a core inspection in conjunction with the annual inspection.

[0088] Furthermore, if it is found that the elastic performance of the spring is higher than the threshold value D8, the converter transformer operation status assessment code is adjusted to the "red code" serious state, and the operation and maintenance personnel should apply for shutdown in time and replace the spring.

[0089] Step 4: Diagnosis, status assessment and maintenance suggestions for the common main drive shaft mechanical hysteresis defect of the tap changer. If all vibration pulse signals are analyzed by the artificial intelligence model to be widened, and the mechanical hysteresis of the drive shaft exceeds the threshold D9, it can be inferred that the common main drive shaft mechanical hysteresis defect of the tap changer occurs. The operating status of the converter transformer is evaluated as "yellow code" and is in an abnormal state. The converter transformer can continue to operate, but it needs to be monitored more closely and the core hanging inspection should be carried out in conjunction with the annual inspection.

[0090] If it is further found that the mechanical hysteresis of the drive shaft exceeds the threshold value D10, the operating status of the converter transformer is evaluated as "red code" and is in a serious state. The operation and maintenance personnel should apply for shutdown in time and replace the switching core.

[0091] Step 5: Diagnosis of leakage defects in the tap changer oil compartment, status assessment and maintenance recommendations. If the inspection data is analyzed horizontally and vertically by artificial intelligence and it is found that the oil level gauge of the small oil pillow drops by more than the threshold value D11 or the oil level rises by more than the threshold value D12, or the trace water content is found to exceed the threshold value D13 during live detection, it can be inferred that there is a leakage defect in the tap changer oil compartment, and the converter transformer operation status is assessed as "yellow code", which is in an abnormal state. The converter transformer can continue to operate, but it needs to be monitored more closely and the oil compartment replaced in conjunction with the annual inspection.

[0092] Based on this, if the power outage test data is comprehensively analyzed by artificial intelligence and it is found that the oil level gauge drops more than the threshold D14 or rises more than the threshold D15, the converter transformer operation status is evaluated as "red code" and is in a serious state. The operation and maintenance personnel should apply for shutdown in time and check the oil chamber seal. If the oil level drops, check the top cover seal; if the oil level rises, check the oil chamber wall and bottom plate seal.

[0093] Step 6: Diagnosis of abnormal faults in the gear transfer of the tap changer, status assessment and maintenance suggestions. If the motor runs normally during the inspection, and the online monitoring finds that the gear is abnormal, and the monitoring background message shows "the gear of the tap changer is out of step", it can be inferred that the gear transfer of the tap changer is abnormal, and the operating status of the converter transformer is assessed as "yellow code". The operation and maintenance personnel should suspend the gear adjustment and check the gear transfer related circuits and components.

[0094] Step 7: Diagnosis of control circuit fault or transmission chain fault of tap changer, status assessment and maintenance suggestions. If the motor does not rotate after the control command is issued during the inspection, and the online monitoring finds that the gear position is abnormal, and the monitoring background message shows "tap changer gear position is out of step", it can be inferred that the tap changer has a control circuit fault or a transmission chain fault, the converter transformer is in an abnormal state, and the operating status is assessed as "yellow code". The operation and maintenance personnel should suspend the tap changer to adjust the gear, and the converter transformer continues to operate to check and solve the control circuit or transmission chain problem.

[0095] Step 8: Diagnosis of abnormal discharge of the switching core of the tap changer or abnormal secondary circuit defects, status assessment and maintenance suggestions. If the online monitoring finds that the pressure relief valve or pressure relay is actuated, it can be determined that the tap changer has abnormal discharge of the switching core or abnormal secondary circuit. The converter transformer is in an abnormal state, and the operating status is assessed as "yellow code". The tap changer is suspended, the converter transformer continues to operate, and the secondary circuit is checked.

[0096] Based on this, if the power outage test detects that the secondary circuit is normal, the converter transformer operating status assessment code will be adjusted to "red code", and the operation and maintenance personnel should apply for shutdown in time, conduct core inspection and replace the switching core.

[0097] D1-D15 is obtained based on the statistical analysis of relevant test data or operation data of the tap changer. The D1-D15 values ​​of tap changers with different structures are different.

[0098] The present invention gradually derives the status evaluation and fault diagnosis of the core components based on the online monitoring, offline monitoring, power outage test, patrol inspection data and a variety of detection methods to be developed of the converter transformer, combined with artificial intelligence technology, and puts forward further maintenance suggestions, thereby forming a fault reasoning flow chart of the converter transformer tap changer component.

[0099] The present invention analyzes online monitoring data by means of artificial intelligence, gradually infers the occurrence of the tap switch mechanism jam defect, evaluates the operating status of the converter transformer when the defect occurs, gives reasonable maintenance suggestions based on the operating status of the converter transformer, and forms a tap switch mechanism jam defect fault reasoning flow chart.

[0100] The present invention utilizes a variety of detection means to be developed to deduce the occurrence of mechanical wear defects of contacts in tap changers, evaluates and encodes the operating status of converter transformers, and then provides reasonable maintenance suggestions to form a flow chart for reasoning about mechanical wear faults of contacts in tap changers.

[0101] The present invention utilizes a variety of detection means to be developed to deduce the occurrence of the defect of the spring elasticity weakening of the quick mechanism of the tap changer, evaluates and encodes the operating status of the converter transformer, and then gives reasonable maintenance suggestions, forming a fault reasoning flow chart of the spring elasticity weakening of the quick mechanism of the tap changer.

[0102] The present invention utilizes a variety of detection means to be developed to deduce the occurrence of common main drive shaft mechanical hysteresis defects in tap changers, evaluates and encodes the operating status of converter transformers, and then gives reasonable maintenance suggestions, forming a flow chart for reasoning about common main drive shaft mechanical hysteresis faults in tap changers.

[0103] The present invention utilizes live monitoring, power outage test and patrol inspection data to analyze and deduce the occurrence of leakage defects in the tap changer oil chamber through artificial intelligence technology, evaluates the operating status of the converter transformer when the defect occurs, and gives reasonable maintenance suggestions based on the operating status of the converter transformer, thus forming a fault reasoning flow chart for leakage defects in the tap changer oil chamber.

[0104] The present invention deduces the occurrence of abnormal gear position transmission of the tap changer, control loop failure or transmission chain failure based on online monitoring and inspection data, evaluates and encodes the operating status of the converter transformer, and then gives reasonable maintenance suggestions, forming a reasoning flow chart of abnormal gear position transmission of the tap changer, control loop failure or transmission chain failure.

[0105] The present invention combines online monitoring and power outage test data to analyze and deduce abnormal discharge of the tap switch switching core or abnormal secondary circuit occurrence, evaluates the operating status of the converter transformer when the defect occurs, and gives reasonable maintenance suggestions based on the operating status of the converter transformer, forming a tap switch switching core abnormal discharge or secondary circuit abnormal fault reasoning flow chart.

[0106] Embodiment 2:

[0107] The present invention also proposes a system 200 for evaluating the state of a converter transformer tap changer assembly, such as Figure 4 As shown, including:

[0108] The data acquisition unit 201 is used to obtain multiple types of data of the converter transformer and determine multiple indicators for evaluating the state of the tap changer assembly;

[0109] A calculation unit 202, configured to determine, according to the multi-type data, a plurality of index values ​​for evaluating the state of the tap changer assembly based on an artificial intelligence model and a digital twin model;

[0110] The judgment unit 203 is used to judge the multiple indicator values ​​and determine the state of the converter transformer tap changer based on the judgment result.

[0111] Among them, there are multiple types of data, including: online monitoring data, offline monitoring data, power outage test data and inspection data.

[0112] Among them, there are many indicators, including: motor current, vibration signal envelope, mechanical wear, spring elasticity, pulses corresponding to separation and closure of main contacts, mechanical hysteresis of drive shaft when vibration pulse signals become wider, small oil pillow oil level gauge, and trace water content.

[0113] The step of judging the multiple index values ​​and determining the state of the converter transformer tap changer based on the judgment result includes:

[0114] If the motor current increase value is higher than the threshold value D1, it is determined that the mechanism jamming state of the converter transformer tap switch is an abnormal state;

[0115] If the linear growth of the vibration signal envelope exceeds the threshold value D2 and the mechanical wear degree value exceeds the threshold value D5, it is determined that the mechanical wear state of the converter transformer tap changer is an abnormal state;

[0116] If the linear growth of the vibration signal envelope exceeds the threshold value D2 and the mechanical wear degree value exceeds the threshold value D5, it is determined that the mechanical wear state of the converter transformer tap changer is a serious fault state;

[0117] If the increase in the pulse interval corresponding to the separation and closing of the main contacts is higher than the threshold value D3, the decrease in the pulse amplitude corresponding to the separation and closing of the main contacts exceeds the threshold value D4, and the spring elasticity value exceeds the threshold value D7, then it is determined that the spring elasticity state of the converter transformer tap changer is an abnormal state;

[0118] If the increase in the pulse interval corresponding to the separation and closing of the main contacts exceeds the threshold value D3, the decrease in the pulse amplitude corresponding to the separation and closing of the main contacts exceeds the threshold value D4, and the spring elasticity value exceeds the threshold value D7, then the spring elasticity state of the converter transformer tap changer is determined to be a serious fault state;

[0119] If the hysteresis value of the drive shaft machinery exceeds the threshold value D9 when the vibration pulse signals are all widened, it is determined that the mechanical state of the main drive shaft of the converter transformer tap changer is abnormal;

[0120] If the hysteresis value of the drive shaft machinery exceeds the threshold value D10 when the vibration pulse signals are all widened, it is determined that the mechanical state of the main drive shaft of the converter transformer tap changer is a serious fault state;

[0121] If the oil level gauge of the small oil pillow drops beyond the threshold value D11, the oil level rises beyond the threshold value D12, or the trace water content exceeds the threshold value D13, it is determined that the oil chamber leakage state of the converter transformer tap changer is abnormal;

[0122] If the oil level gauge of the small oil pillow drops beyond the threshold value D14 or the oil level rises beyond the threshold value D15, it is determined that the oil chamber leakage state of the converter transformer tap changer is a serious fault state.

[0123] The determining unit 203 is further configured to:

[0124] According to the inspection data in the multi-type data, based on the artificial intelligence model and the digital twin model, the status of the tap changer gear, control circuit, transmission chain and switching core is determined, including:

[0125] If the artificial intelligence model and the digital twin model determine based on the inspection data that the motor is running normally, the gear is abnormal, and the gear of the tap changer is out of step, then the gear state of the tap changer is determined to be the gear up abnormal state;

[0126] If it is determined that the motor does not rotate, the gear position is abnormal, and the tap changer gear position is out of step after the control command is issued, it is determined that the state of the tap changer control circuit or the rotation chain state is abnormal, and the converter transformer is in an abnormal state;

[0127] If it is determined that the pressure relief valve is actuated or the pressure relay is actuated, and it is determined that the switching core of the tap changer or the state of the secondary circuit is abnormal, then the converter transformer is in an abnormal state;

[0128] If it is determined that the pressure relief valve or the pressure relay is actuated and the status of the secondary circuit is normal, the converter transformer is in a serious fault state.

[0129] The application of the present invention can determine various faults of the converter transformer in a convenient and efficient manner.

[0130] Embodiment 3:

[0131] Based on the same inventive concept, the present invention also provides a computer device, which includes a processor and a memory, wherein the memory is used to store a computer program, the computer program includes program instructions, and the processor is used to execute the program instructions stored in the computer storage medium. The processor may be a central processing unit (CPU), or other general-purpose processors, digital signal processors (DSP), application-specific integrated circuits (ASIC), field-programmable gate arrays (FPGA) or other programmable logic devices, discrete gates or transistor logic devices, discrete hardware components, etc. It is the computing core and control core of the terminal, which is suitable for implementing one or more instructions, and is specifically suitable for loading and executing one or more instructions in the computer storage medium to implement the corresponding method flow or corresponding functions, so as to implement the steps of the method in the above embodiment.

[0132] Embodiment 4:

[0133] Based on the same inventive concept, the present invention also provides a storage medium, specifically a computer-readable storage medium (Memory), which is a memory device in a computer device for storing programs and data. It is understandable that the computer-readable storage medium here can include both a built-in storage medium in a computer device and an extended storage medium supported by the computer device. The computer-readable storage medium provides a storage space, which stores the operating system of the terminal. In addition, one or more instructions suitable for being loaded and executed by a processor are also stored in the storage space, and these instructions can be one or more computer programs (including program codes). It should be noted that the computer-readable storage medium here can be a high-speed RAM memory or a non-volatile memory, such as at least one disk memory. The processor can load and execute one or more instructions stored in the computer-readable storage medium to implement the steps of the method in the above embodiment.

[0134] It will be appreciated by those skilled in the art that embodiments of the present invention may be provided as methods, systems, or computer program products. Therefore, the present invention may take the form of a complete hardware embodiment, a complete software embodiment, or an embodiment combining software and hardware. Moreover, the present invention may take the form of a computer program product implemented on one or more computer-usable storage media (including but not limited to disk storage, CD-ROM, optical storage, etc.) containing computer-usable program codes. The schemes in the embodiments of the present invention may be implemented in various computer languages, for example, object-oriented programming language Java and literal scripting language JavaScript, etc.

[0135] The present invention is described with reference to flowcharts and / or block diagrams of methods, devices (systems), and computer program products according to embodiments of the present invention. It should be understood that each process and / or block in the flowchart and / or block diagram, as well as the combination of processes and / or blocks in the flowchart and / or block diagram, can be implemented by computer program instructions. These computer program instructions can be provided to a processor of a general-purpose computer, a special-purpose computer, an embedded processor, or other programmable data processing device to produce a machine, so that the instructions executed by the processor of the computer or other programmable data processing device generate instructions for implementing the processes in the flowchart and / or block diagram. Figure 1 A process or multiple processes and / or boxes Figure 1 A device that provides the functions specified in a block or multiple blocks.

[0136] These computer program instructions may also be stored in a computer-readable memory capable of directing a computer or other programmable data processing device to operate in a specific manner, so that the instructions stored in the computer-readable memory produce an article of manufacture comprising an instruction device, which implements the process Figure 1 A process or multiple processes and / or boxes Figure 1 A function specified in one or more boxes.

[0137] These computer program instructions can also be loaded onto a computer or other programmable data processing device so that a series of operating steps are executed on the computer or other programmable device to produce a computer-implemented process, thereby providing instructions for implementing the process. Figure 1 A process or multiple processes and / or boxes Figure 1 The steps for the functions specified in one or more boxes.

[0138] Although the preferred embodiments of the present invention have been described, those skilled in the art may make other changes and modifications to these embodiments once they have learned the basic creative concept. Therefore, the appended claims are intended to be interpreted as including the preferred embodiments and all changes and modifications that fall within the scope of the present invention.

[0139] Obviously, those skilled in the art can make various changes and modifications to the present invention without departing from the spirit and scope of the present invention. Thus, if these modifications and variations of the present invention fall within the scope of the claims of the present invention and their equivalents, the present invention is also intended to include these modifications and variations.

Claims

1. A method for evaluating the state of a converter transformer tap changer assembly, characterized in that: include: Obtain multiple types of data from converter transformers and determine multiple indicators for tap changer component status evaluation; According to the multi-type data, based on the artificial intelligence model and the digital twin model, multiple indicator values ​​for tap changer component status evaluation are determined; The multiple indicator values ​​are judged, and based on the judgment result, the state of the converter transformer tap changer is determined.

2. The method according to claim 1, characterized in that The multiple types of data include: online monitoring data, offline monitoring data, power outage test data and inspection data.

3. The method according to claim 1, characterized in that The multiple indicators include: motor current, vibration signal envelope, mechanical wear, spring elasticity, pulses corresponding to separation and closure of main contacts, mechanical hysteresis of the drive shaft when the vibration pulse signals become wider, small oil pillow oil level gauge, and trace water content.

4. The method according to claim 1, characterized in that: The step of judging the multiple indicator values ​​and determining the state of the converter transformer tap switch based on the judgment result includes: If the motor current increase value is higher than the threshold value D1, it is determined that the mechanism jamming state of the converter transformer tap switch is an abnormal state; If the linear growth of the vibration signal envelope exceeds the threshold value D2 and the mechanical wear degree value exceeds the threshold value D5, it is determined that the mechanical wear state of the converter transformer tap changer is an abnormal state; If the linear growth of the vibration signal envelope exceeds the threshold value D2 and the mechanical wear degree value exceeds the threshold value D5, it is determined that the mechanical wear state of the converter transformer tap changer is a serious fault state; If the increase in the pulse interval corresponding to the separation and closing of the main contacts is higher than the threshold value D3, the decrease in the pulse amplitude corresponding to the separation and closing of the main contacts exceeds the threshold value D4, and the spring elasticity value exceeds the threshold value D7, it is determined that the spring elasticity state of the converter transformer tap changer is abnormal; If the increase in the pulse interval corresponding to the separation and closing of the main contacts exceeds the threshold value D3, the decrease in the pulse amplitude corresponding to the separation and closing of the main contacts exceeds the threshold value D4, and the spring elasticity value exceeds the threshold value D7, then the spring elasticity state of the converter transformer tap changer is determined to be a serious fault state; If the hysteresis value of the drive shaft machinery exceeds the threshold value D9 when the vibration pulse signals are all widened, it is determined that the mechanical state of the main drive shaft of the converter transformer tap changer is abnormal; If the hysteresis value of the drive shaft machinery exceeds the threshold value D10 when the vibration pulse signals are all widened, it is determined that the mechanical state of the main drive shaft of the converter transformer tap changer is a serious fault state; If the oil level gauge of the small oil pillow drops beyond the threshold value D11, the oil level rises beyond the threshold value D12, or the trace water content exceeds the threshold value D13, it is determined that the oil chamber leakage state of the converter transformer tap changer is abnormal; If the oil level gauge of the small oil pillow drops beyond the threshold value D14 or the oil level rises beyond the threshold value D15, it is determined that the oil chamber leakage state of the converter transformer tap changer is a serious fault state.

5. The method according to claim 1, characterized in that The method further comprises: According to the inspection data in the multi-type data, based on the artificial intelligence model and the digital twin model, the status of the tap changer gear, control circuit, transmission chain and switching core is determined, including: If the artificial intelligence model and the digital twin model determine based on the inspection data that the motor is running normally, the gear is abnormal, and the gear of the tap changer is out of step, then the gear state of the tap changer is determined to be the gear up abnormal state; If it is determined that the motor does not rotate, the gear position is abnormal, and the tap changer gear position is out of step after the control command is issued, it is determined that the state of the tap changer control circuit or the rotation chain state is abnormal, and the converter transformer is in an abnormal state; If it is determined that the pressure relief valve is actuated or the pressure relay is actuated, and it is determined that the switching core of the tap changer or the state of the secondary circuit is abnormal, then the converter transformer is in an abnormal state; If it is determined that the pressure relief valve or the pressure relay is actuated and the status of the secondary circuit is normal, the converter transformer is in a serious fault state.

6. A system for evaluating the state of a converter transformer tap changer assembly, characterized in that: include: A data acquisition unit, used to obtain multiple types of data of the converter transformer and determine multiple indicators for the status evaluation of the tap changer assembly; A calculation unit, configured to determine, according to the multi-type data, a plurality of index values ​​for evaluating the state of the tap changer assembly based on an artificial intelligence model and a digital twin model; The judging unit is used to judge the multiple indicator values ​​and determine the state of the converter transformer tap changer based on the judgment result.

7. The system according to claim 6, characterized in that The multiple types of data include: online monitoring data, offline monitoring data, power outage test data and inspection data.

8. The system according to claim 6, characterized in that The multiple indicators include: motor current, vibration signal envelope, mechanical wear, spring elasticity, pulses corresponding to separation and closure of main contacts, mechanical hysteresis of the drive shaft when the vibration pulse signals become wider, small oil pillow oil level gauge, and trace water content.

9. The system according to claim 6, characterized in that The step of judging the multiple indicator values ​​and determining the state of the converter transformer tap switch based on the judgment result includes: If the motor current increase value is higher than the threshold value D1, it is determined that the mechanism jamming state of the converter transformer tap switch is an abnormal state; If the linear growth of the vibration signal envelope exceeds the threshold value D2 and the mechanical wear degree value exceeds the threshold value D5, it is determined that the mechanical wear state of the converter transformer tap changer is an abnormal state; If the linear growth of the vibration signal envelope exceeds the threshold value D2 and the mechanical wear degree value exceeds the threshold value D5, it is determined that the mechanical wear state of the converter transformer tap changer is a serious fault state; If the increase in the pulse interval corresponding to the separation and closing of the main contacts is higher than the threshold value D3, the decrease in the pulse amplitude corresponding to the separation and closing of the main contacts exceeds the threshold value D4, and the spring elasticity value exceeds the threshold value D7, it is determined that the spring elasticity state of the converter transformer tap changer is abnormal; If the increase in the pulse interval corresponding to the separation and closing of the main contacts exceeds the threshold value D3, the decrease in the pulse amplitude corresponding to the separation and closing of the main contacts exceeds the threshold value D4, and the spring elasticity value exceeds the threshold value D7, then the spring elasticity state of the converter transformer tap changer is determined to be a serious fault state; If the hysteresis value of the drive shaft machinery exceeds the threshold value D9 when the vibration pulse signals are all widened, it is determined that the mechanical state of the main drive shaft of the converter transformer tap changer is abnormal; If the hysteresis value of the drive shaft machinery exceeds the threshold value D10 when the vibration pulse signals are all widened, it is determined that the mechanical state of the main drive shaft of the converter transformer tap changer is a serious fault state; If the oil level gauge of the small oil pillow drops beyond the threshold value D11, the oil level rises beyond the threshold value D12, or the trace water content exceeds the threshold value D13, it is determined that the oil chamber leakage state of the converter transformer tap changer is abnormal; If the oil level gauge of the small oil pillow drops beyond the threshold value D14 or the oil level rises beyond the threshold value D15, it is determined that the oil chamber leakage state of the converter transformer tap changer is a serious fault state.

10. The system according to claim 6, characterized in that The judging unit is also used for: According to the inspection data in the multi-type data, based on the artificial intelligence model and the digital twin model, the status of the tap changer gear, control circuit, transmission chain and switching core is determined, including: If the artificial intelligence model and the digital twin model determine based on the inspection data that the motor is running normally, the gear is abnormal, and the gear of the tap changer is out of step, then the gear state of the tap changer is determined to be the gear up abnormal state; If it is determined that the motor does not rotate, the gear position is abnormal, and the tap changer gear position is out of step after the control command is issued, it is determined that the state of the tap changer control circuit or the rotation chain state is abnormal, and the converter transformer is in an abnormal state; If it is determined that the pressure relief valve is actuated or the pressure relay is actuated, and it is determined that the switching core of the tap changer or the state of the secondary circuit is abnormal, then the converter transformer is in an abnormal state; If it is determined that the pressure relief valve or the pressure relay is actuated and the status of the secondary circuit is normal, the converter transformer is in a serious fault state.

11. A computer device, characterized in that: include: one or more processors; a processor for executing one or more programs; When the one or more programs are executed by the one or more processors, the method according to any one of claims 1 to 5 is implemented.

12. A computer-readable storage medium, characterized in that: A computer program is stored thereon, and when the computer program is executed, the method according to any one of claims 1 to 5 is implemented.

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