Mutual inductor system based on wireless radio frequency technology and mutual inductor wireless monitoring method

Abstract

The invention provides a mutual inductor system based on a wireless radio frequency technology and a mutual inductor wireless monitoring method. The mutual inductor system comprises the steps that current information is obtained, and a performance detection strategy calculates the transformation ratio and precision according to the current information; radio frequency intensity information and temperature information are collected, whether a fault occurs is judged according to the radio frequency intensity information, the temperature information and the current information through a self-diagnosis strategy, if yes, fault characters are generated, and operation power information, the temperature information, the current information and the fault characters are stored; if not, storing the operation power, the operation temperature, the operation current and the current timestamp; position characters of the mutual inductor are set, the receiver enters the signal range of the wireless radio frequency unit to activate the wireless radio frequency unit, and the wireless radio frequency unit sends radio frequency signals including current information, temperature information, radio frequency intensity information, fault characters and the position characters. According to the invention, the detection data of the mutual inductor can be rapidly and accurately obtained without secondary power-off operation, the fault reason of the mutual inductor can be rapidly and accurately judged, and the mutual inductor can be repaired in time.

Description

Technical Field

[0001] The present invention relates to the technical field of mutual inductor monitoring, and in particular to a mutual inductor system and a mutual inductor wireless monitoring method based on wireless radio frequency technology. Background Art

[0002] Current transformers are essential equipment in traditional power system operations and maintenance. However, reading the transformation ratio requires shutting down the power supply and opening the distribution cabinet door. This method is not only inefficient but also time-consuming and labor-intensive. Furthermore, the transformation ratio reading process poses a significant risk of electric shock to maintenance personnel, posing a serious threat to their safety.

[0003] With the development of technology, wirelessly communicating instrument transformers have emerged in existing technologies. However, these existing instrument transformers have significant design flaws. While operators can wirelessly receive instrument transformer data, they are unable to quickly locate the specific location of the instrument transformers based on this data during large-scale power system maintenance. Furthermore, they are unable to quickly identify instrument transformer faults by combining historical data with real-time monitoring data, making it impossible to take effective repair measures in a timely manner. This significantly impacts the reliability and stability of the power system and increases its operation and maintenance costs. Summary of the Invention

[0004] In view of this, the problem to be solved by the present invention is to provide a transformer system and a transformer wireless monitoring method based on wireless radio frequency technology, which can quickly and accurately obtain the detection data of the transformer without a secondary power outage operation, quickly and accurately determine the cause of the transformer failure and repair it in time, thereby reducing equipment downtime.

[0005] In order to solve the above technical problems, the technical solution adopted by the present invention is: A transformer system and a transformer wireless monitoring method based on wireless radio frequency technology include obtaining current information including transformer input current and output current, and a performance detection strategy calculating the transformer ratio and accuracy based on the current information; Collect radio frequency strength information indicating radio frequency signal strength and temperature information of the transformer operating temperature. The self-diagnosis strategy determines whether the transformer or the transformer system is faulty based on the transformer's radio frequency strength information, temperature information, and current information. If so, generate and store the fault character, radio frequency strength information, temperature information, and current information. If not, generate and store the operating power, operating temperature, operating current, and current timestamp. The position character of the mutual inductor is set, and the receiver enters the signal range of the wireless radio frequency unit to activate the wireless radio frequency unit. The wireless radio frequency unit sends a radio frequency signal containing current information, temperature information, radio frequency strength information, fault character, and position character, and the receiver receives it wirelessly.

[0006] Furthermore, the current information includes calibration based on a temperature compensation strategy, and the temperature compensation strategy: obtains the current ambient temperature, the transformer input current and the transformer output current, obtains a calibration value according to the current ambient temperature, and adjusts the transformer input current and the transformer output current based on the calibration value.

[0007] Furthermore, the self-diagnosis strategy includes: receiving fault thresholds of several fault types, obtaining radio frequency intensity information, temperature information or current information corresponding to the fault type, comparing the radio frequency intensity information, temperature information or current information with the corresponding fault threshold and determining whether the fault threshold is met; if so, no fault exists; otherwise, generating a fault character corresponding to the fault type.

[0008] Furthermore, the fault character includes a first head end for determining a character type and a first number for determining a fault type.

[0009] Furthermore, the position character includes a second head end for indicating a three-phase line or a ground line and a second number for indicating a position of a distribution cabinet.

[0010] A mutual inductor system based on wireless radio frequency technology includes a collection unit for obtaining sampled data of the mutual inductor; The acquisition unit communicates with the main control unit, and the main control unit receives and processes the sampled data to generate monitoring data of the mutual inductor; The main control unit communicates with the storage unit, and the storage unit is used to store the sampling data and monitoring data of the mutual inductor; The main control unit communicates data with the wireless radio frequency unit, and the wireless radio frequency unit is used to convert monitoring data or sampling data into radio frequency signals and send them.

[0011] Furthermore, the wireless radio frequency unit includes a control module for controlling the operation of the control module, and the control module communicates with the radio frequency module that emits radio frequency signals, the dial module that sets the inverter position character, the storage module that stores inverter information, and the wireless communication module that uploads data in the storage unit to the cloud platform.

[0012] Furthermore, the main control unit communicates data with the open circuit protection unit, and the open circuit protection unit includes an open circuit relay for short-circuiting the secondary side of the mutual inductor and an audible and visual alarm module for generating audible and visual signals.

[0013] Furthermore, the storage unit continuously receives and stores the monitoring data and sampling data of the mutual inductor within a recent preset time period based on a cyclic coverage mode.

[0014] The advantages and positive effects of the present invention are: By collecting current information of input current and output current of the mutual inductor, radio frequency intensity information of radio frequency signal intensity, temperature information of mutual inductor operating temperature and position character of the mutual inductor respectively, judging whether the mutual inductor or mutual inductor system is faulty according to the radio frequency intensity information, temperature information and current information and generating fault character, and transmitting radio frequency signal containing current information, temperature information, radio frequency intensity information, fault character and position character through the wireless radio frequency unit, the detection data of the mutual inductor can be quickly and accurately obtained without secondary power-off operation, the fault cause of the mutual inductor can be quickly and accurately judged and timely repaired. BRIEF DESCRIPTION OF DRAWINGS

[0015] The accompanying drawings are included to provide a further understanding of the present application, and constitute a part of the specification, illustrate the present application and explain the technical scheme of the present application, and do not constitute a limitation on the present application. In the drawings: Figure 1 is a structure diagram of a mutual inductor system based on wireless radio frequency technology of the present application; Figure 2 is a structure diagram of a wireless radio frequency unit in a mutual inductor system based on wireless radio frequency technology of the present application; Figure 3 is a principle diagram of a mutual inductor system monitoring method based on wireless radio frequency technology of the present application. DETAILED DESCRIPTION

[0016] The technical scheme in the embodiments of the present application will be described clearly and completely below in combination with the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, but not all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative labor fall within the scope of protection of the present application.

[0017] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which the present application belongs. The terminology used in the description of the present application herein only for the purpose of describing specific embodiments and is not intended to limit the present application. The term "and / or" used herein includes any and all combinations of one or more of the associated listed items.

[0018] The present application provides a mutual inductor system based on wireless radio frequency technology, as shown in Figure 1As shown, the mutual inductor system comprises a collection unit for collecting mutual inductor sampling data, the collection unit is in data intercommunication with a master control unit, the master control unit receives and processes the sampling data to generate monitoring data of the mutual inductor, the master control unit is in data intercommunication with a storage unit, the storage unit is used for storing the sampling data and the monitoring data of the mutual inductor. The master control unit is in data intercommunication with a wireless radio frequency unit, the wireless radio frequency unit is used for converting the monitoring data or the sampling data into a radio frequency signal and sending. When the maintenance personnel is maintaining, a handheld receiver is close to the receivable range of the mutual inductor, the receiver activates the wireless radio frequency unit to make the wireless radio frequency unit emit the radio frequency signal, the receiver obtains the sampling data or the monitoring data of the mutual inductor, the collection of the mutual inductor data is completed, and the efficiency and safety of information collection during the maintenance of the mutual inductor are improved.

[0019] As shown in the Figure 2 wireless radio frequency unit comprises a control module for controlling the operation of each module, and the control module is in data intercommunication with a radio frequency module, a dial module and a storage module. The dial module comprises a first dial component and a second dial component, the first dial component is used for setting the number information of the mutual inductor, and the second dial component is used for setting the phase line information (the phase line information comprises three phase lines and a ground wire) of the mutual inductor, the phase line information and the code information jointly constitute the position character of the mutual inductor. The storage module is used for storing the position character and the production date of the mutual inductor. The radio frequency module emits the radio frequency signal based on the information recorded in the storage module and the storage unit. An embodiment of the present application is that the radio frequency unit supports NFC / RFID protocol, the communication distance of the radio frequency unit is less than 1.5 meters, and the radio frequency unit is compatible with ISO / IEC 15693 standard, thereby improving the stability and compatibility of the radio frequency unit communication.

[0020] In order to improve the flexibility and timeliness of mutual inductor maintenance, a wireless communication module in data intercommunication with the master control module is arranged in the wireless radio frequency unit, and the wireless communication module is used for uploading the data in the storage unit to a cloud platform. The operation and maintenance personnel can access the cloud platform to obtain the operation data and performance data of the mutual inductor in time, so as to realize remote monitoring and management of the mutual inductor and improve the flexibility and timeliness of operation and maintenance. An embodiment of the present application is that the wireless communication module is a 4G expansion module / WiFi expansion module.

[0021] The mutual inductor is prone to open circuit fault at the secondary side during operation, which is easy to cause damage to the mutual inductor. In order to reduce the probability of damage to the mutual inductor during operation, an open circuit protection unit in data intercommunication with the master control unit is arranged. The open circuit protection unit comprises an open circuit relay for short-circuiting the secondary side of the mutual inductor and an audible and light alarm module for generating audible and light signals. When the master control unit detects that the secondary side of the mutual inductor generates an open circuit fault, the open circuit relay is controlled to be turned on in time to short-circuit the secondary side of the mutual inductor, thereby reducing the probability of damage to the mutual inductor caused by high voltage due to the open circuit at the secondary side. The audible and light alarm module comprises a red and blue dual-color LED and a buzzer, and the dual-color LED and the buzzer are controlled to flash at different frequencies and vibrate at different frequencies according to different fault danger levels.

[0022] The acquisition unit continuously acquires temperature information of the operating temperature of the transformer coil, current information of the input current and output current of the transformer, and radio frequency strength information of the radio frequency signal strength. The temperature information, the current information, and the radio frequency information jointly constitute the sampling data of the transformer. The acquisition unit sends the temperature information, the current information, and the radio frequency strength information to the main control unit, and the main control unit determines the transformation ratio, the precision, and the fault condition of the transformer according to the above information, and the transformation ratio, the precision, and the fault condition jointly constitute the monitoring data of the transformer.

[0023] The storage unit continuously receives and stores the monitoring data and the sampling data of the transformer. The storage unit stores data in a cyclic coverage mode, so that the storage unit always stores the monitoring data and the sampling data of the transformer in the recent periods, facilitating the operation and maintenance personnel to find potential problems of the transformer according to the monitoring data and the sampling data of the transformer in the recent days, and improving the efficiency of the maintenance of the transformer. An embodiment of the present application is that the storage unit includes a flash storage chip with a memory greater than 1 MB.

[0024] An embodiment of the present application is that the storage unit stores the monitoring data and the sampling data in a time stamp order, and the operation and maintenance personnel export a csv format report containing the monitoring data and the sampling data through the receiving instrument.

[0025] A transformer system monitoring method based on wireless radio frequency technology, as shown in Figure 3 includes acquiring current information containing input current and output current of the transformer, and the performance detection strategy calculates the transformation ratio and the precision of the transformer according to the current information.

[0026] The current information acquisition includes calibrating the current information based on the temperature compensation strategy, which can improve the accuracy of the current information acquisition and improve the calculation accuracy of the transformation ratio and the precision of the transformer. The temperature compensation strategy includes: acquiring the current environmental temperature, the input current of the transformer, and the output current of the transformer, acquiring the calibration value according to the current environmental temperature, and adjusting the input current of the transformer and the output current of the transformer based on the calibration value.

[0027] The performance detection strategy includes: acquiring the input current and the output current of the transformer, and calculating the transformation ratio and the precision based on the input current and the output current of the transformer.

[0028] An embodiment of the present application is that the main control unit receives the input current and the output current of the transformer, the main control unit calculates the transformation ratio and the precision of the transformer according to the input current and the output current, and stores the transformation ratio, the precision, and the corresponding time stamp into the storage unit.

[0029] The radio frequency strength information representing the radio frequency signal strength and the temperature information representing the operating temperature of the transformer are collected, the self-diagnosis strategy judges whether the transformer or the transformer system is faulty according to the radio frequency strength information, the temperature information and the current information of the transformer, if yes, generates and stores the fault character, the radio frequency strength information, the temperature information and the current information; if no, stores the operating power, the operating temperature, the operating current and the current time stamp.

[0030] The self-diagnosis strategy comprises: receiving a fault threshold corresponding to a fault type, obtaining radio frequency strength information, temperature information or current information corresponding to the fault type, comparing the radio frequency strength information, the temperature information or the current information with the corresponding fault threshold and judging whether it meets the fault threshold, if yes, there is no fault, if no, generating a fault character corresponding to the fault type.

[0031] The fault threshold comprises a strength threshold corresponding to the radio frequency strength information, a temperature threshold corresponding to the stability information and a current threshold corresponding to the current information, and the above thresholds are set in advance.

[0032] In an embodiment of the present application, the radio frequency strength information is obtained, and it is judged whether the radio frequency strength information is lower than the strength threshold, if yes, it indicates that there is a communication interruption fault, a fault character representing the communication fault is generated, if no, it indicates that there is no communication interruption fault, and no fault character is generated.

[0033] The temperature information is obtained, and it is judged whether the temperature information is higher than the temperature threshold, if yes, it indicates that the operating temperature of the transformer exceeds the upper limit, and there is a heating fault, a fault character representing the temperature exceeding the limit is generated, if no, it indicates that the operating temperature of the transformer does not exceed the upper limit, and no fault character is generated.

[0034] The current information is obtained, and it is judged whether the current information meets the current threshold, if no, it indicates that the transformer has no current fault, and no transformer fault character is generated, if yes, it indicates that the transformer has a current fault, it is judged whether the output current of the secondary side of the transformer is 0, if yes, it indicates that there is an open circuit fault on the secondary side of the transformer, the open circuit relay is controlled to act to short the secondary side, and a fault character representing the open circuit of the secondary side is generated, if no, it indicates that the transformer has other current faults, and a fault character representing the current fault of the transformer is generated.

[0035] The fault character comprises a head and a number, the head is used to determine the type of the character, and the number is used to determine the fault type. In an embodiment of the present application, E01 is a fault character of the temperature exceeding the limit, E02 is a fault character of the communication interruption, E represents a fault, 01 represents the temperature exceeding the limit, and 02 represents the signal interruption.

[0036] In an embodiment of the present application, the main control unit obtains the radio frequency strength information, the temperature information and the current information, the main control unit judges the fault condition of the transformer or the transformer system based on the above information, and then generates a corresponding fault character according to the specific fault type.

[0037] The position character of the transformer is set, the receiving instrument enters the signal range of the wireless radio frequency unit to activate the wireless radio frequency unit, and the wireless radio frequency unit sends a radio frequency signal containing current information, temperature information, radio frequency intensity information, a fault character and a position character.

[0038] The position character includes a head and a number, the head is used for corresponding to three-phase lines and ground lines, and the number is used for corresponding to positions of power distribution cabinets. One embodiment of the application is that the heads are A, B, C and N respectively, A, B and C represent three-phase lines respectively, N represents a ground line, A6 represents a transformer on an A-phase line in the sixth power distribution cabinet, and an operation and maintenance personnel can quickly determine the positions of the power distribution cabinet and the transformer in the power distribution cabinet through the position character.

[0039] The above has described the embodiments of the application in detail, but the content described is only the preferred embodiments of the application and cannot be considered as used for limiting the implementation scope of the application. Any equivalent changes and improvements made within the scope of the application should still belong to the scope covered by the patent.

Claims

1. A method for wireless monitoring of mutual inductors based on wireless radio frequency technology, characterized in that: The method includes obtaining current information including input current and output current of the transformer, and the performance detection strategy calculates the transformation ratio and accuracy of the transformer based on the current information; Collecting radio frequency strength information indicating radio frequency signal strength and temperature information indicating operating temperature of the transformer, wherein the self-diagnosis strategy determines whether the transformer or the transformer system is faulty based on the radio frequency strength information, temperature information, and current information of the transformer, and if so, generates and stores a fault character, radio frequency strength information, temperature information, and current information; No, generate and store operating power, operating temperature, operating current and current timestamp; The position character of the mutual inductor is set, and the receiver enters the signal range of the wireless radio frequency unit to activate the wireless radio frequency unit. The wireless radio frequency unit sends a radio frequency signal containing current information, temperature information, radio frequency strength information, fault character, and position character, and the receiver receives it wirelessly.

2. The method for wireless monitoring of mutual inductors based on wireless radio frequency technology according to claim 1, characterized in that: The current information includes calibration based on a temperature compensation strategy, wherein the temperature compensation strategy: obtains the current ambient temperature, the transformer input current and the transformer output current, obtains a calibration value according to the current ambient temperature, and adjusts the transformer input current and the transformer output current based on the calibration value.

3. The method for wireless monitoring of mutual inductors based on wireless radio frequency technology according to claim 1, characterized in that: The self-diagnosis strategy includes: receiving fault thresholds of several fault types, obtaining radio frequency intensity information, temperature information or current information corresponding to the fault type, comparing the radio frequency intensity information, temperature information or current information with the corresponding fault threshold and determining whether the fault threshold is met. If so, no fault exists; otherwise, generating a fault character corresponding to the fault type.

4. The method for wireless monitoring of mutual inductors based on wireless radio frequency technology according to claim 1, characterized in that: The fault character includes a first head end for determining a character type and a first number for determining a fault type.

5. The method for wireless monitoring of mutual inductors based on wireless radio frequency technology according to claim 1, characterized in that: The position characters include a second head end for indicating a three-phase line or a ground line and a second number for indicating a position of a power distribution cabinet.

6. A mutual inductor system based on wireless radio frequency technology, according to a mutual inductor wireless monitoring method based on wireless radio frequency technology according to any one of claims 1 to 5, characterized in that: It includes an acquisition unit for acquiring sampling data of a mutual inductor; The acquisition unit communicates with the main control unit, and the main control unit receives and processes the sampled data to generate monitoring data of the mutual inductor; The main control unit communicates with the storage unit, and the storage unit is used to store the sampling data and monitoring data of the mutual inductor; The main control unit communicates data with the wireless radio frequency unit, and the wireless radio frequency unit is used to convert monitoring data or sampling data into radio frequency signals and send them.

7. The mutual inductor system based on wireless radio frequency technology according to claim 6, characterized in that: The wireless radio frequency unit includes a control module for controlling the operation of the control module, and the control module communicates with the radio frequency module that sends radio frequency signals, the dial module that sets the inverter position character, the storage module that stores inverter information, and the wireless communication module that uploads data in the storage unit to the cloud platform.

8. The mutual inductor system based on wireless radio frequency technology according to claim 6, characterized in that: The main control unit communicates data with the open circuit protection unit, and the open circuit protection unit includes an open circuit relay for short-circuiting the secondary side of the mutual inductor and an audible and visual alarm module for generating audible and visual signals.

9. The mutual inductor system based on wireless radio frequency technology according to claim 6, characterized in that: The storage unit continuously receives and stores monitoring data and sampling data of the mutual inductor within a recent preset time period based on a cyclic coverage mode.

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