On-load tap-changer operation characteristic on-line monitoring system and on-load tap-changer operation characteristic on-line monitoring method

Abstract

The invention provides an on-load tap-changer operation characteristic on-line monitoring system and method, and the system comprises an acquisition module which comprises an operation detection sensor, an electronic current sensor, and an oil chromatography analysis sensor; the action detection sensor is arranged on a transmission shaft of an operating mechanism of the tap switch and is used for monitoring action state data of the tap switch in real time; the electronic current sensor is installed on a transmission shaft of an operation mechanism of the tap switch and used for monitoring transition current data in the action process of the tap switch in real time. The oil chromatographic analysis sensor is mounted at an oil outlet of the tap switch and is used for monitoring fault gas data in real time, and the fault gas data comprises gas category and content; the monitoring module comprises a receiving unit and a monitoring unit, and the receiving unit receives monitoring data transmitted by the action detection sensor in real time through wireless communication; and the monitoring unit carries out comprehensive analysis and processing to obtain an on-line monitoring result of the operating characteristics of the tap switch. According to the scheme, on-line monitoring of the operating characteristics of the on-load tap-changer can be realized.

Description

Technical Field

[0001] The present application relates to the technical field of high voltage transformers, and in particular to an online monitoring system and method for the action characteristics of an on-load tap changer. Background Art

[0002] On-load tap changers are installed in high-voltage transformers in power systems. They can change the transformer winding tapping connection position under transformer excitation or load, thereby changing the transformer voltage ratio, ensuring reliable power supply while improving power quality. Unqualified on-load tap changer action characteristics will lead to excessive tap changer temperature, which will cause the transformer to trip, directly affecting the safe and stable operation of the power system. Therefore, on-load tap changers must be monitored.

[0003] In the prior art, monitoring methods usually require detection when the tap changer stops operating, which makes it impossible to understand the operating status of the tap changer in real time. For example, during the normal operation of the transformer, if a potential fault occurs in the tap changer, these faults may gradually worsen due to the inability to perform online monitoring, and will not be discovered until they affect the normal operation of the transformer, at which time they may have caused significant losses. Regular power outage monitoring will seriously affect the reliability and stability of the power system. Summary of the invention

[0004] In view of the above-mentioned defects or deficiencies in the prior art, the present application aims to provide a system and method for online monitoring of the operating characteristics of an on-load tap changer.

[0005] In a first aspect, the present application proposes an on-load tap changer action characteristic online monitoring system, comprising: A collection module, the collection module includes a motion detection sensor, an electronic current sensor, and an oil chromatography sensor; the motion detection sensor is installed on the transmission shaft of the operating mechanism of the tap switch, and is configured to monitor the action state data of the tap switch in real time; the electronic current sensor is installed on the transmission shaft of the operating mechanism of the tap switch, and is configured to monitor the transition current data of the action process of the tap switch in real time; the oil chromatography sensor is installed at the oil outlet of the tap switch, and is configured to monitor the fault gas data in real time, and the fault gas data includes gas type and content; A monitoring module, the monitoring module at least includes a receiving unit and a monitoring unit, the receiving unit is configured to receive in real time through wireless communication the action state data transmitted by the action detection sensor, the transition current data transmitted by the electronic current sensor, and the fault gas data transmitted by the oil chromatography analysis sensor; the monitoring unit is configured to obtain an online monitoring result of the action characteristics of the tap changer based on comprehensive analysis and processing of the action state data, the transition current data, and the fault gas data; the online monitoring result provides a basis for determining the fault type of the tap changer.

[0006] According to the technical solution provided in the embodiment of the present application, it also includes a communication module, and the communication module is configured to realize wireless communication between the acquisition module and the monitoring module, and between the monitoring module and the user terminal.

[0007] According to the technical solution provided in the embodiment of the present application, it also includes a power supply module, which is configured to provide a continuous and stable DC power supply to the acquisition module, the monitoring module and the communication module.

[0008] According to the technical solution provided in the embodiment of the present application, the monitoring module also includes a storage unit, and the storage unit is configured to store the online monitoring results.

[0009] According to the technical solution provided in the embodiment of the present application, the storage unit is also configured to transmit the online monitoring result to the user terminal via wireless communication.

[0010] In a second aspect, the present application proposes an on-load tap changer action characteristic online monitoring method, which is implemented based on the on-load tap changer action characteristic online monitoring system as described above. The monitoring method comprises the following steps: Real-time acquisition of action status data and transition current data on the transmission shaft of the operating mechanism of the tap changer and fault gas data at the oil outlet of the tap changer; Obtaining an online monitoring result of the action characteristics of the tap changer according to the action state data, the transition current data and the fault gas data; According to the online monitoring result of the action characteristic, the predicted fault type of the tap changer is obtained; Acquire operation-related data, and obtain a relevant fault type set according to the operation-related data, wherein the relevant fault type set includes a plurality of relevant fault types corresponding to the operation-related data; the operation-related data includes transformer load, ambient temperature, and ambient humidity; It is determined whether the relevant fault type set contains the relevant fault type that matches the predicted fault type; if so, the predicted fault type is reported to the user terminal.

[0011] According to the technical solution provided in the embodiment of the present application, after determining whether the relevant fault type set contains the relevant fault type that matches the predicted fault type, the following steps are also included: Determining whether the motion detection sensor, the electronic current sensor, and the oil chromatography sensor deviate from corresponding initial installation positions; If at least one sensor deviates from the corresponding initial installation position, calibrate the sensor deviating from the corresponding initial installation position as an offset sensor, and obtain the offset of each of the offset sensors; Obtaining corresponding offset error compensation according to the offset of each offset sensor, so as to update the online monitoring result of the action characteristic and obtain an updated monitoring result; According to the updated monitoring result, obtaining an updated fault type of the tap changer; It is determined whether the relevant fault type set contains the relevant fault type that matches the updated fault type; if so, the updated fault type is reported to the user terminal.

[0012] According to the technical solution provided by the embodiment of the present application, the method further includes determining the initial installation positions corresponding to the motion detection sensor, the electronic current sensor, and the oil chromatography analysis sensor; Determining the initial installation position corresponding to the motion detection sensor specifically includes the following steps: Determine a power input point, a transmission link, and a final action execution component on the transmission shaft during the operation of the tap changer to obtain at least one key action area; Acquire vibration data of each of the key action areas, wherein the vibration data is related to the vibration frequency and vibration amplitude of the key action area; The key motion area corresponding to the maximum vibration data is used as the initial installation position corresponding to the motion detection sensor.

[0013] According to the technical solution provided in the embodiment of the present application, determining the initial installation position corresponding to the oil chromatography analysis sensor specifically includes the following steps: Determine a plurality of candidate areas at the oil outlet of the tap changer, and obtain the fault gas concentration of each candidate area when the tap changer is actuated; The candidate area corresponding to the maximum fault gas concentration is used as the initial installation position corresponding to the oil chromatography analysis sensor.

[0014] According to the technical solution provided in the embodiment of the present application, the step of obtaining the offset of each offset sensor specifically includes the following steps: Obtaining current positions corresponding to the motion detection sensor, the electronic current sensor, and the oil chromatography analysis sensor; Taking the deviation distance between the current position and the initial installation position corresponding to each offset sensor as the offset amount of each offset sensor; After obtaining the offset of each offset sensor, the following steps are also included: Recording the offset of the offset sensor and the corresponding recording time to generate an operation log; A calibration period is obtained according to the plurality of groups of offsets recorded in the operation log and the corresponding recording times.

[0015] Compared with the prior art, the beneficial effect of the present application is that the present application can monitor the action state, transition current and fault gas data of the tap changer in real time, and timely discover potential fault hazards. For example, when the action of the tap changer is abnormal, the system can immediately issue an alarm to remind the operation and maintenance personnel to handle it to avoid further deterioration of the fault. Moreover, monitoring can be carried out without power outage, which ensures the continuous power supply of the power system and improves the reliability and stability of the power system. Especially for some important places where power supply cannot be interrupted, the online monitoring system can monitor the tap changer in real time without affecting normal production and life. In addition, by setting the installation position of each sensor and using wireless communication to transmit and analyze data, the transmitted monitoring results are highly consistent with the actual action signal of the on-load tap changer, and can measure the action characteristics of the actual switching process of the on-load tap changer in real time and accurately. The data is more in line with the actual operation of the tap changer, which improves the reliability of data analysis. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 A schematic diagram of the structure of an on-load tap changer operation characteristic online monitoring system provided in an embodiment of the present application; Figure 2 A schematic diagram of the connections of the modules of the on-load tap changer action characteristics online monitoring system provided in an embodiment of the present application; Figure 3 A flowchart of the steps for online monitoring of the operating characteristics of an on-load tap changer provided in an embodiment of the present application. DETAILED DESCRIPTION

[0017] The present application is further described in detail below in conjunction with the accompanying drawings and embodiments. It is to be understood that the specific embodiments described herein are only used to explain the relevant invention, rather than to limit the invention. It is also necessary to explain that, for ease of description, only the parts related to the invention are shown in the accompanying drawings.

[0018] It should be noted that, in the absence of conflict, the embodiments and features in the embodiments of the present application can be combined with each other. The present application will be described in detail below with reference to the accompanying drawings and in combination with the embodiments.

[0019] Example 1 As mentioned in the background technology, in order to solve the problems in the prior art, this application proposes an on-load tap changer action characteristic online monitoring system, please refer to Figure 1 and Figure 2 As shown, including: A collection module, the collection module includes a motion detection sensor, an electronic current sensor, and an oil chromatography sensor; the motion detection sensor is installed on the transmission shaft of the operating mechanism of the tap switch, and is configured to monitor the action state data of the tap switch in real time; the electronic current sensor is installed on the transmission shaft of the operating mechanism of the tap switch, and is configured to monitor the transition current data of the action process of the tap switch in real time; the oil chromatography sensor is installed at the oil outlet of the tap switch, and is configured to monitor the fault gas data in real time, and the fault gas data includes gas type and content; Specifically, a special fixture or fixture is used to fix the motion detection sensor and the electronic current sensor at a suitable position of the transmission shaft to avoid displacement during the operation of the tap changer. The motion detection sensor should be able to monitor the action status data of the tap changer in real time, including the action time, action amplitude, action frequency, etc. The motion detection sensor can be a displacement sensor, an angle sensor, etc., and a suitable sensor type is selected according to the movement characteristics of the transmission shaft. The electronic current sensor is also installed on the transmission shaft of the tap changer operating mechanism and is installed on the side close to the current conducting component to accurately measure the transition current data during the operation of the tap changer. The electronic current sensor should be able to monitor the transition current data during the operation of the tap changer in real time, including the peak value, effective value, waveform, etc. of the current. The sensor can be a Hall current sensor, a Rogowski coil, etc., and a suitable sensor type is selected according to the current size and frequency range of the tap changer; the oil chromatographic analysis sensor is installed at the oil outlet of the tap changer to ensure that the sensor can fully contact the insulating oil inside the tap changer. The oil chromatographic analysis sensor can select a suitable sensor type according to the type of fault gas to be monitored. For example, if you need to monitor fault gases such as hydrogen, acetylene, carbon monoxide, etc., you can use the corresponding gas sensors for detection.

[0020] A monitoring module, the monitoring module at least includes a receiving unit and a monitoring unit, the receiving unit is configured to receive in real time through wireless communication the action state data transmitted by the action detection sensor, the transition current data transmitted by the electronic current sensor, and the fault gas data transmitted by the oil chromatography analysis sensor; the monitoring unit is configured to obtain an online monitoring result of the action characteristics of the tap changer based on comprehensive analysis and processing of the action state data, the transition current data, and the fault gas data; the online monitoring result of the action characteristics provides a basis for determining the fault type of the tap changer.

[0021] Specifically, the monitoring unit can use data analysis algorithms, fault diagnosis models and other technologies to conduct in-depth analysis of the data and extract the action characteristic parameters of the tap changer, such as action time, action amplitude, transition current peak value, fault gas content, etc. The operating status and fault category of the tap changer are judged based on these parameters. The monitoring unit should be able to perform fault diagnosis based on the online monitoring results to determine whether the tap changer has a fault and the type and severity of the fault. A fault diagnosis model can be established to compare the online monitoring results with the fault characteristics in the model to determine the type of fault. For example, if the transition current peak value is too high, the action time is prolonged, and the fault gas contains components such as acetylene, it may indicate that the tap changer has an arc discharge fault.

[0022] In a preferred embodiment, it further comprises a communication module, wherein the communication module is configured to realize wireless communication between the acquisition module and the monitoring module, and between the monitoring module and a user terminal.

[0023] Specifically, the communication module can select low-power, long-distance wireless communication technologies such as Bluetooth, ZigBee, and LoRa to ensure the stability and reliability of data transmission. According to the installation location and distance of the acquisition module and the monitoring module, select the appropriate communication frequency and power to improve the communication quality.

[0024] In a preferred embodiment, it also includes a power supply module, which is configured to provide a continuous and stable DC power supply to the acquisition module, the monitoring module and the communication module.

[0025] Specifically, you can use a DC power source such as a battery or solar cell, and choose the appropriate power source type according to the actual situation. Make sure that the output voltage and current of the power source meet the working requirements of each module and have sufficient capacity and endurance.

[0026] In a preferred embodiment, the monitoring module further comprises a storage unit, and the storage unit is configured to store the online monitoring result.

[0027] Specifically, the storage unit should be able to store the online monitoring results obtained by the monitoring module, including action characteristic parameters, fault diagnosis results, etc. Storage devices such as databases and storage chips can be used to store data for a long time. Ensure that the capacity of the storage unit is large enough to meet the needs of long-term monitoring.

[0028] In a preferred embodiment, the storage unit is further configured to transmit the online monitoring result to the user terminal via wireless communication.

[0029] Specifically, corresponding applications or software can be developed on the user terminal to display and analyze the received online monitoring results. The action characteristic parameters and fault diagnosis results of the tap changer can be intuitively displayed in the form of charts, reports, etc. Users can set alarm thresholds, query historical data, etc. through applications or software to timely discover and handle tap changer faults.

[0030] Example 2 On the basis of Example 1, this example proposes an on-load tap changer action characteristic online monitoring method, which is implemented based on the on-load tap changer action characteristic online monitoring system as described above. Please refer to Figure 3 As shown, the monitoring method comprises the following steps: S1. Real-time acquisition of action state data and transition current data on the transmission shaft of the operating mechanism of the tap changer and fault gas data at the oil outlet of the tap changer; Specifically, the action status data includes action time, action amplitude, and action frequency; the transition current data includes current peak value, current effective value, and current waveform; and the fault gas data includes gas type and gas content.

[0031] S2. Obtaining an online monitoring result of the tap changer action characteristic according to the action state data, the transition current data and the fault gas data; Specifically, the online monitoring results include fused comprehensive data and a set of characteristic parameters. The weighted average method is used to perform weighted summation on the data types according to the weights of each data type to obtain fused comprehensive data. The characteristic parameter set includes several characteristic parameters, and the characteristic parameters include current spectrum characteristics and action characteristics. The transition current data is extracted using fast Fourier transform to obtain current spectrum characteristics. The action state data is statistically extracted to obtain the mean and standard deviation of the action time as action characteristics.

[0032] For example, the weight of the action time is 0.3, the weight of the action amplitude is 0.2, the weight of the action frequency is 0.1, the weight of the current peak is 0.2, the weight of the current effective value is 0.1, the gas category of the fault gas is hydrogen, and the weight of the gas content is 0.1. If the currently collected action time is 4 seconds, the action amplitude is 30 degrees, the action frequency is 12 times a day, the current peak is 90A, the current effective value is 75A, and the hydrogen content is 130ppm, then the fused comprehensive data is: 4×0.3 + 30×0.2 + 12×0.1 + 90×0.2 + 75×0.1 + 130×0.1 = 24.7; the extracted feature parameter set is: the mean action time is 3.8 seconds, the standard deviation of the action amplitude is 2.5 degrees, and the transition current peak is 95A.

[0033] S3. Obtaining a predicted fault type of the tap changer according to the online monitoring result of the action characteristic; Specifically, the online monitoring results of the action characteristics are input into the predicted fault model to obtain the predicted fault type, wherein the predicted fault model is obtained through neural network training. During training, the fused comprehensive data and the feature parameter set are used as model input, and the fault type corresponding to the fused comprehensive data and the feature parameter set is used as model output for training.

[0034] S4. Acquire operation-related data, and obtain a relevant fault type set according to the operation-related data, wherein the relevant fault type set includes a plurality of relevant fault types corresponding to the operation-related data; the operation-related data includes transformer load, ambient temperature, and ambient humidity; Specifically, current transformers, temperature sensors and humidity sensors are used to measure the load current, ambient temperature and ambient humidity of the transformer respectively. The sensor transmits the collected data to the monitoring system through wired or wireless communication. When the transformer load is too high or the ambient temperature is too high, it may cause overheating of the tap changer; when the ambient humidity is high, it may cause faults such as degradation of the insulation performance of the tap changer. Based on this empirical knowledge, a corresponding set of related fault types can be generated.

[0035] S5. Determine whether the relevant fault type set contains the relevant fault type that matches the predicted fault type; if so, report the predicted fault type to the user terminal.

[0036] Specifically, if the predicted fault type matches a fault type in the related fault type set, the predicted fault type is reported to the user terminal, and corresponding fault handling suggestions and measures are provided.

[0037] In a preferred embodiment, after determining whether the relevant fault type set contains the relevant fault type that matches the predicted fault type, the following steps are further included: Determining whether the motion detection sensor, the electronic current sensor, and the oil chromatography sensor deviate from corresponding initial installation positions; Specifically, a laser rangefinder, position sensor or other device can be used to measure the current position of the sensor and compare it with the initial installation position. For example, for a motion detection sensor, a position marker can be installed on the transmission shaft, and then a laser rangefinder can be used to measure the distance between the sensor and the position marker to determine whether the position of the sensor has changed.

[0038] If at least one sensor deviates from the corresponding initial installation position, calibrate the sensor deviating from the corresponding initial installation position as an offset sensor, and obtain the offset of each of the offset sensors; For example, if the electronic current sensor is an offset sensor, a three-dimensional coordinate measuring machine can be used to measure the current position coordinates of the sensor on the three coordinate axes, and then compare them with the initial installation position coordinates to calculate the offset. The calculated offset is more accurate than the deviation distance.

[0039] Obtaining corresponding offset error compensation according to the offset of each offset sensor, so as to update the online monitoring result of the action characteristic and obtain an updated monitoring result; Specifically, when the position of the sensor changes, the measured data will be biased. Taking the motion detection sensor as an example, because the installation position of the sensor is determined based on factors such as the movement characteristics of the transmission shaft of the tap changer, after the position changes, the relationship between the perceived motion signal and the actual motion signal will change. For each sensor, there are compensation algorithms for offset and offset error compensation. For the motion detection sensor, the compensation algorithm is established based on the geometric position relationship and kinematic principles of the sensor. For the electronic current sensor, the compensation algorithm is established based on the law of electromagnetic induction and the electromagnetic characteristics of the sensor. For the oil chromatography analysis sensor, the compensation algorithm is established based on the principle of Fick's law of gas diffusion. The measurement error of each offset sensor is compensated to the corresponding data, and then data fusion and feature extraction are performed again to obtain updated monitoring results.

[0040] According to the updated monitoring result, obtaining an updated fault type of the tap changer; For example, if the motion detection sensor is offset, resulting in an increase in displacement measurement error, the displacement measurement error is subtracted from the motion state data when the monitoring result is updated to obtain more accurate motion characteristic parameters. Then, the updated motion characteristic parameters are used to re-diagnose and predict faults to obtain an updated fault type of the tap changer.

[0041] It is determined whether the relevant fault type set contains the relevant fault type that matches the updated fault type; if so, the updated fault type is reported to the user terminal.

[0042] In a preferred embodiment, the method further comprises determining the initial installation positions corresponding to the motion detection sensor, the electronic current sensor, and the oil chromatography analysis sensor; Determining the initial installation position corresponding to the motion detection sensor specifically includes the following steps: Determine a power input point, a transmission link, and a final action execution component on the transmission shaft during the operation of the tap changer to obtain at least one key action area; Specifically, the power input point, the area of ​​the transmission link and the area of ​​the action execution component are regarded as key action areas.

[0043] Acquire vibration data of each of the key action areas, wherein the vibration data is related to the vibration frequency and vibration amplitude of the key action area; The key motion area corresponding to the maximum vibration data is used as the initial installation position corresponding to the motion detection sensor.

[0044] Specifically, the motion detection sensor detects whether the three-phase action of the tap changer is balanced, so the sensitivity of the response to the perceived action needs to be considered, so the key action area corresponding to the maximum vibration data is used as the initial installation position corresponding to the motion detection sensor. This ensures that the motion sensor can capture the action of the tap changer during the action process to the maximum extent.

[0045] In a preferred embodiment, determining the initial installation position corresponding to the oil chromatography analysis sensor specifically includes the following steps: Determine a plurality of candidate areas at the oil outlet of the tap changer, and obtain the fault gas concentration of each candidate area when the tap changer is actuated; The candidate area corresponding to the maximum fault gas concentration is used as the initial installation position corresponding to the oil chromatography analysis sensor.

[0046] Specifically, several candidate areas at the oil outlet of the tap switch are determined. The oil outlet can be divided into several small areas according to the shape and size of the oil outlet as candidate installation positions. When the tap switch is in action, the oil chromatography sensor is used to measure the fault gas concentration in each candidate area. The continuous sampling and analysis method can be used to monitor the change of the fault gas concentration in each candidate area in real time. The candidate area corresponding to the maximum fault gas concentration is used as the initial installation position corresponding to the oil chromatography sensor. This ensures that the sensor is installed at a location with a high fault gas concentration, thereby improving the sensitivity and accuracy of fault detection.

[0047] In a preferred embodiment, obtaining the offset of each offset sensor specifically includes the following steps: Obtaining current positions corresponding to the motion detection sensor, the electronic current sensor, and the oil chromatography analysis sensor; Taking the deviation distance between the current position and the initial installation position corresponding to each offset sensor as the offset amount of each offset sensor; Specifically, for the motion detection sensor installed on the transmission shaft, a combination of a rotary encoder and a position sensor can be used to measure the angular position and radial position of the sensor on the transmission shaft. For the oil chromatography analysis sensor, a three-dimensional coordinate measuring machine can be used to measure the position coordinates of the sensor at the oil outlet.

[0048] After obtaining the offset of each offset sensor, the following steps are also included: Recording the offset of the offset sensor and the corresponding recording time to generate an operation log; Specifically, the operation log may include information such as the sensor type, number, offset, and recording time.

[0049] A calibration period is obtained according to the plurality of groups of offsets recorded in the operation log and the corresponding recording times.

[0050] Specifically, the operation log may contain information such as the type, number, offset, and recording time of the sensor. The offset trend and change pattern of the sensor can be determined by analyzing and processing the data in the operation log. For example, a statistical analysis method can be used to calculate statistical parameters such as the mean value and standard deviation of the sensor offset. Then, the calibration period of the sensor is determined based on the change trend and statistical parameters of the offset. If the offset of the sensor changes greatly or the change trend is unstable, the calibration period needs to be shortened; if the offset of the sensor changes slightly and is stable, the calibration period can be appropriately extended.

[0051] For example, for the oil chromatography analysis sensor, the offset and the corresponding recording time are recorded every other day (48 hours) during the first month of system operation. The following is part of the recorded data: Recording time 1: 8 am on January 1, the offset is 0.1 mm. Recording time 2: 8 am on January 3, the offset is 0.12 mm. Recording time 3: 8 am on January 5, the offset is 0.13 mm... Calculate the offset change value between two adjacent recording times, and then divide it by the time interval to get the average offset change value every 48 hours. From recording time 1 to recording time 2, the offset change value is 0.02 mm, and the time interval is 48 hours, so the average offset increase is 0.02 mm every 48 hours during this period. From recording time 2 to recording time 3, the offset change value is 0.01 mm, and the time interval is also 48 hours, so the average offset increase is 0.01 mm every 48 hours. Considering these records comprehensively, it is assumed that the average offset increase is about 0.015 mm every 48 hours. Set the offset threshold of the oil chromatography analysis sensor to 1 mm. Calibration cycle = offset threshold ÷ average change rate. Then the calibration cycle is 3200 hours, which is about 133 days. Thus, for this oil chromatography sensor, under ideal conditions, calibration would only be required approximately every 133 days.

[0052] Specifically, the position of each sensor is calibrated during the calibration cycle to ensure a higher consistency between the collected monitoring data and the actual action of the tap changer.

[0053] This article uses specific examples to illustrate the principles and implementation methods of this application. The description of the above embodiments is only used to help understand the method and its core ideas of this application. The above is only the preferred implementation method of this application. It should be pointed out that due to the limitations of textual expression and the objective existence of infinite specific structures, ordinary technicians in this technical field can make several improvements, modifications or changes without departing from the principles of the present invention, and can also combine the above technical features in an appropriate manner; these improvements, modifications, changes or combinations, or the direct application of the inventive concept and technical solution to other occasions without improvement, should be regarded as the scope of protection of this application.

Claims

1. An on-line monitoring system for the operating characteristics of an on-load tap changer, characterized in that: include: A collection module, the collection module includes a motion detection sensor, an electronic current sensor, and an oil chromatography sensor; the motion detection sensor is installed on the transmission shaft of the operating mechanism of the tap switch, and is configured to monitor the action state data of the tap switch in real time; the electronic current sensor is installed on the transmission shaft of the operating mechanism of the tap switch, and is configured to monitor the transition current data of the action process of the tap switch in real time; the oil chromatography sensor is installed at the oil outlet of the tap switch, and is configured to monitor the fault gas data in real time, and the fault gas data includes gas type and content; A monitoring module, the monitoring module at least includes a receiving unit and a monitoring unit, the receiving unit is configured to receive in real time through wireless communication the action state data transmitted by the action detection sensor, the transition current data transmitted by the electronic current sensor, and the fault gas data transmitted by the oil chromatography analysis sensor; the monitoring unit is configured to obtain an online monitoring result of the action characteristics of the tap changer based on comprehensive analysis and processing of the action state data, the transition current data, and the fault gas data; the online monitoring result provides a basis for determining the fault type of the tap changer.

2. The on-load tap changer action characteristic online monitoring system according to claim 1 is characterized in that: It also includes a communication module, which is configured to achieve wireless communication between the acquisition module and the monitoring module, and between the monitoring module and a user terminal.

3. The on-line monitoring system for the operating characteristics of the on-load tap changer according to claim 2 is characterized in that: It also includes a power supply module, which is configured to provide a continuous and stable DC power supply to the acquisition module, the monitoring module and the communication module.

4. The on-line monitoring system for the operating characteristics of the on-load tap changer according to claim 2 is characterized in that: The monitoring module also includes a storage unit, and the storage unit is configured to store the online monitoring result.

5. The on-line monitoring system for the operating characteristics of the on-load tap changer according to claim 4 is characterized in that: The storage unit is also configured to transmit the online monitoring result to the user terminal via wireless communication.

6. A method for online monitoring of the operating characteristics of an on-load tap changer, characterized in that: Based on the on-load tap changer action characteristic online monitoring system according to any one of claims 1 to 5, the monitoring method comprises the following steps: Real-time acquisition of action status data and transition current data on the transmission shaft of the operating mechanism of the tap changer and fault gas data at the oil outlet of the tap changer; Obtaining an online monitoring result of the tap changer action characteristic according to the action state data, the transition current data and the fault gas data; According to the online monitoring result, a predicted fault type of the tap changer is obtained; Acquire operation-related data, and obtain a relevant fault type set according to the operation-related data, wherein the relevant fault type set includes a plurality of relevant fault types corresponding to the operation-related data; the operation-related data includes transformer load, ambient temperature, and ambient humidity; It is determined whether the relevant fault type set contains the relevant fault type that matches the predicted fault type; if so, the predicted fault type is reported to the user terminal.

7. The method for online monitoring of the operating characteristics of an on-load tap changer according to claim 6, characterized in that: After determining whether the relevant fault type set contains the relevant fault type that matches the predicted fault type, the following steps are also included: Determining whether the motion detection sensor, the electronic current sensor, and the oil chromatography sensor deviate from corresponding initial installation positions; If at least one sensor deviates from the corresponding initial installation position, calibrate the sensor deviating from the corresponding initial installation position as an offset sensor, and obtain the offset of each of the offset sensors; Obtaining corresponding offset error compensation according to the offset of each offset sensor, so as to update the online monitoring result and obtain an updated monitoring result; According to the updated monitoring result, obtaining an updated fault type of the tap changer; It is determined whether the relevant fault type set contains the relevant fault type that matches the updated fault type; if so, the updated fault type is reported to the user terminal.

8. The method for online monitoring of the operating characteristics of an on-load tap changer according to claim 7, characterized in that: The method further includes determining initial installation positions corresponding to the motion detection sensor, the electronic current sensor, and the oil chromatography analysis sensor; Determining the initial installation position corresponding to the motion detection sensor specifically includes the following steps: Determine a power input point, a transmission link, and a final action execution component on the transmission shaft during the operation of the tap changer to obtain at least one key action area; Acquire vibration data of each of the key action areas, wherein the vibration data is related to the vibration frequency and vibration amplitude of the key action area; The key motion area corresponding to the maximum vibration data is used as the initial installation position corresponding to the motion detection sensor.

9. The method for online monitoring of the operating characteristics of an on-load tap changer according to claim 7, characterized in that: Determining the initial installation position corresponding to the oil chromatography analysis sensor specifically includes the following steps: Determine a plurality of candidate areas at the oil outlet of the tap changer, and obtain the fault gas concentration of each candidate area when the tap changer is actuated; The candidate area corresponding to the maximum fault gas concentration is used as the initial installation position corresponding to the oil chromatography analysis sensor.

10. The method for online monitoring of the operating characteristics of an on-load tap changer according to claim 8, characterized in that: The step of obtaining the offset of each offset sensor specifically comprises the following steps: Obtaining current positions corresponding to the motion detection sensor, the electronic current sensor, and the oil chromatography analysis sensor; Taking the deviation distance between the current position and the initial installation position corresponding to each offset sensor as the offset amount of each offset sensor; After obtaining the offset of each offset sensor, the following steps are also included: Recording the offset of the offset sensor and the corresponding recording time to generate an operation log; A calibration period is obtained according to the plurality of groups of offsets recorded in the operation log and the corresponding recording times.

Images