On-load tap-changer transient vibration signal acquisition sensing system

Abstract

The utility model discloses an on-load tap-changer transient vibration signal acquisition sensing system, which comprises a synchronous controller, an MCU microcontroller and a vibration sensor, and is characterized in that the vibration sensor is in physical magnetic connection with a transformer shell through a magnetic base to acquire vibration signals of the transformer shell; the single-channel constant-current source signal conditioner is electrically connected through a shielding cable, is used for providing direct-current voltage and conditioning and amplifying signals, is connected in series with a vibration acquisition AD converter through a port, and is used for completing conversion from data analog vibration signals to digital vibration signals; according to the utility model, the vibration sensor, the current sensor and the communication subsystem are installed on the housing, close to the on-load tap-changer, of the transformer, a worker does not need to enter a site, and the sensors automatically collect vibration signals and driving motor current signals generated by switching when the on-load tap-changer is switched, and then upload the signals to the cloud platform. And signal storage, display and analysis are realized.

Description

TECHNICAL FIELD

[0001] The utility model relates to a kind of on-load tap changer transient vibration signal acquisition sensing technology fields, specifically for a kind of on-load tap changer transient vibration signal acquisition sensing system. BACKGROUND

[0002] On-load tap changer transformer is an important power transmission and distribution equipment in power system, which is responsible for connecting power grid, adjusting active and reactive power flow, and maintaining the stability of load center voltage. Its application in modern power grid is increasing. On-load tap changer is usually used in high-voltage transmission transformers and key load distribution transformers. Through continuous operation of on-load tap changer (OLTC), on-load tap changer is realized for high-voltage power transmission and distribution network to ensure the voltage of industrial and residential power systems remains constant. The failure of oil-immersed on-load tap changer accounts for 27.8% of total transformer failures. Among them, contact wear, poor contact, and motor failure are the main causes of failure. Therefore, research on online monitoring and fault identification technology of oil-immersed on-load tap changer is crucial for ensuring the safety, stability, and reliable operation of power systems.

[0003] The "on-load tap changer operating state monitoring device" of Chinese patent number CN202323352827.2 proposes a on-load tap changer operating state monitoring device that combines vibration signal, transformer voltage signal, and drive motor current signal monitoring and analysis to correct false tap changer problems under on-load tap changer operating state, accurately detect the state of transformer OLTC, and achieve one-key viewing on cloud platform with real-time acquisition, wireless transmission, and wide diagnostic coverage.

[0004] However, the vibration signal generated during on-load switch switching process is an important data for online state monitoring. State monitoring technology based on vibration signal can improve maintenance efficiency and accuracy. Once there is a fault in the switch or the switch has failed, the vibration signal transmitted to the transformer shell surface will change. By monitoring this vibration signal online and comparing it with the set detection method, the operating state of the on-load tap changer can be reflected timely, effectively and accurately.

[0005] In the prior art, manual on-site entry is required, vibration signal acquisition efficiency is low, data is difficult to store in large quantities, and problems cannot be automatically analyzed. Utility model content

[0006] The utility model provides a kind of on-load tap-changer transient vibration signal acquisition sensing system, can effectively solve the problem that the above background technology needs artificial access to the scene, vibration signal acquisition efficiency is low, data is difficult to store in large quantities, cannot be automatically analyzed.

[0007] To achieve the above object, the utility model provides the following technical scheme: a kind of on-load tap-changer transient vibration signal acquisition sensing system, including synchronous controller, MCU microcontroller and vibration sensor;

[0008] Vibration sensor is connected with transformer shell by magnetic attraction base to complete physical magnetic attraction, vibration signal of transformer shell is collected, and then single-channel constant-current source signal conditioner is connected by shielded cable, for providing DC voltage and signal conditioning amplification, and vibration acquisition AD converter is connected by port in series, for completing the conversion of data analog vibration signal to digital vibration signal;

[0009] Loop Hall current sensor is sleeved on single cable of driving motor by opening and closing buckle, and current signal can be monitored, and current acquisition AD converter is connected by port in series at rear end, to complete the conversion of data analog current signal to digital current signal;

[0010] According to the above technical scheme, the MCU microcontroller is electrically connected with Hall current sensor and vibration sensor through port, and is electrically connected with synchronous controller, to ensure that driving motor current signal can trigger to wake up vibration sensor to work synchronously, to realize synchronous high-speed acquisition of driving motor current signal and vibration signal.

[0011] According to the above technical scheme, the Flash data storage is electrically connected with MCU microcontroller, to ensure normal storage of data and avoid power loss;

[0012] 4G communication antenna is electrically connected with MCU microcontroller, and data is uploaded to cloud server platform through 4G signal.

[0013] According to the above technical scheme, the DC power supply is electrically connected with MCU microcontroller, to ensure that uninterrupted power supply is provided for other structures of acquisition sensing system;

[0014] Wireless connection is completed between cloud server platform and 4G communication antenna through 4G signal.

[0015] According to the above technical scheme, the synchronous controller, MCU microcontroller, single-channel constant-current source signal conditioner, vibration acquisition AD converter, current acquisition AD converter, Flash data storage and DC power supply are externally installed with sun-proof and waterproof shell.

[0016] Compared with the prior art, the utility model provide a kind of on-line load tap-changer transient vibration signal acquisition sensing system, vibration sensor, current sensor and communication subsystem are installed on the shell of transformer near load tap-changer, without manual entering field, vibration signal and driving motor current signal generated when sensor automatically acquires switching are uploaded into cloud platform subsequently, realize the storage, demonstration and analysis of signal;

[0017] Traditional technology has some obvious limitations in the maintenance and monitoring of load tap-changer, first, these technologies usually need to be shipped regularly for manual maintenance, which not only consumes a lot of manpower and financial resources, but also is inefficient, in addition, due to the existence of many moving parts in mechanical load tap-changer, the switching time is long, once the time error of adjacent mechanical switching exceeds the preset value, it will be difficult to extinguish arc, causing arc discharge of hundreds of kiloampere on the tap-changer, which is prone to explosion and fire, these problems not only increase the maintenance cost, but also may threaten the stable operation of power grid, compared with the above, the present patent technology provides a kind of load tap-changer transient vibration signal acquisition sensing system, which can be monitored online for a long time, realizes non-contact data acquisition, this system extracts characteristic information from the vibration signal of OLTC through embedded intelligent monitoring, and realizes online monitoring and fault diagnosis of OLTC mechanical state, so as to significantly improve the real-time and accuracy of monitoring, in addition, the present patent technology can realize remote monitoring and data analysis through intelligent internet-of-things technology, further optimize cost control, the application of this technology not only reduces the consumption of manpower and financial resources, but also improves work efficiency and safety, provides more reliable guarantee for the stable operation of power system.

[0018] In the development blueprint of the power industry, the future power grid will deeply integrate cutting-edge information technologies such as mobile internet and artificial intelligence, as well as advanced communication technologies, to create a power Internet of Things (IoT) platform that comprehensively senses the power grid status, efficiently processes information, and provides convenient and flexible applications. This platform will rely on intelligent sensing devices within the power IoT. These devices can capture key data such as acoustic vibration and drive motor current, and transmit this data in real time to cloud servers via high-speed wireless network technologies such as 4G / 5G, including dedicated power fiber optic networks. In the cloud, backend processing software will conduct in-depth analysis of the collected data, including not only evaluating the current performance status of on-load tap changers, but also... This analytical capability, including the ability to predict potential future changes, greatly enhances the early warning capability for on-load tap changer faults, providing a scientific basis for preventative maintenance. Furthermore, based on IoT-based intelligent detection technology, the mechanical performance monitoring system for on-load tap changers enables remote real-time monitoring and in-depth analysis of equipment status. The transient vibration signal acquisition and sensing system for on-load tap changers proposed in this paper improves the comprehensive perception capability of the on-load tap changer status, enabling maintenance personnel to obtain timely and accurate fault warning information. This information is crucial for rapid response to potential faults, helping to reduce power outages and improve the continuity and reliability of power supply. Attached Figure Description

[0019] The accompanying drawings are provided to further understand the present invention and form part of the specification. They are used together with the embodiments of the present invention to explain the present invention and do not constitute a limitation thereof.

[0020] In the attached diagram:

[0021] Fig. 1 This is a schematic diagram of the on-load tap changer data acquisition and sensing system of this utility model;

[0022] Fig. 2 This is a schematic diagram of the installation of the data acquisition and sensing system of this utility model;

[0023] The following components are labeled in the diagram: 1. Synchronous controller; 2. MCU microcontroller; 3. Vibration sensor; 4. Single-channel constant current source signal conditioner; 5. Vibration acquisition AD converter; 6. Ring-type Hall current sensor; 7. Current acquisition AD converter; 8. Flash data storage; 9. 4G communication antenna; 10. DC power supply; 11. Cloud server platform; 12. Sunscreen and waterproof shell. Detailed Implementation

[0024] The preferred embodiments of the present invention will be described below with reference to the accompanying drawings. It should be understood that the preferred embodiments described herein are for illustration and explanation only and are not intended to limit the present invention.

[0025] Embodiment: as Figs. 1-2 The utility model provides technical schemes, a kind of on-load tap-changer transient vibration signal acquisition sensing system, including synchronous controller 1, MCU microcontroller 2 and vibration sensor 3;

[0026] Vibration sensor 3 is connected with transformer shell by magnetic attraction base to complete physical magnetic attraction, the vibration signal of transformer shell is collected, and then it is connected with single-channel constant-current source signal conditioner 4 by shielded cable, for providing DC voltage and signal conditioning amplification, while vibration acquisition AD converter 5 is connected by port in series, for completing the conversion of data analog vibration signal to digital vibration signal;

[0027] Loop Hall current sensor 6 is sleeved on single cable of driving motor by open-close buckle, and current signal can be monitored, and current acquisition AD converter 7 is connected by port in series at rear end, to complete the conversion of data analog current signal to digital current signal;

[0028] MCU microcontroller 2 is connected with Hall current sensor and vibration sensor by port, and is also connected with synchronous controller 1, to ensure that vibration sensor can be triggered to work when driving motor current signal exists, to realize synchronous high-speed acquisition of driving motor current signal and vibration signal.

[0029] Flash data storage 8 is connected with MCU microcontroller 2, to ensure normal storage of data, to avoid power loss;

[0030] 4G communication antenna 9 is connected with MCU microcontroller 2, and data is uploaded to cloud server platform 11 by 4G signal.

[0031] DC power supply 10 is connected with MCU microcontroller 2, to ensure that uninterrupted power supply is provided for other structures of acquisition sensing system;

[0032] Wireless connection is completed between cloud server platform 11 and 4G communication antenna 9 by 4G signal.

[0033] According to the above technical scheme, synchronous controller 1, MCU microcontroller 2, single-channel constant-current source signal conditioner 4, vibration acquisition AD converter 5, current acquisition AD converter 7, Flash data storage 8 and DC power supply 10 are externally installed with sunscreen, waterproof shell 12.

[0034] The working principle and use process of the utility model: when using, the vibration sensor 3 is installed on the transformer shell near the on-load tap-changer of the transformer, the ring buckle type Hall current sensor 6 is installed on the single cable of the driving motor, the single channel constant current source signal conditioner 4, vibration acquisition AD converter 5, current acquisition AD converter 7, flash data storage 8, 4G communication antenna 9 and direct current power supply 10 are fixed on the transformer shell, and the sun-proof, waterproof shell 12 is added, so that the system is not affected by the environment. The synchronous controller 1 can guarantee that the driving motor current signal triggers the vibration sensor 3 to work, the signal acquisition sensing system can realize synchronous high-speed acquisition of the driving motor current signal and the vibration signal, the flash data storage ensures that the power-off data is not lost within a certain period, the 4G communication antenna completes real-time data uploading, the direct current power supply provides uninterrupted power supply for other structures of the acquisition sensing system, and real-time monitoring of the system is realized.

[0035] Finally, it should be noted that: the above only for the preferred examples of the utility model, and not for limiting the utility model, although the utility model is described in detail with reference to the foregoing embodiments, for the person skilled in the art, it still can modify the technical scheme recorded in the foregoing each embodiment, or equivalent replacement to part of the technical features. Any modification, equivalent replacement, improvement, etc. within the spirit and principles of the utility model should be included in the protection scope of the utility model.

Claims

1. A transient vibration signal acquisition and sensing system for on-load tap changers, characterized in that: It includes a synchronous controller (1), an MCU microcontroller (2), and a vibration sensor (3); The vibration sensor (3) is physically magnetically connected to the transformer shell through the magnetic base to collect the vibration signal of the transformer shell. Then, it is electrically connected to the single-channel constant current source signal conditioner (4) through the shielded cable. At the same time, the vibration acquisition AD converter (5) is connected in series through the port. The ring-type Hall current sensor (6) is mounted on a single cable of the drive motor through a snap-fit ​​mechanism to monitor the current signal. The back end is connected in series with a current acquisition AD converter (7) to complete the conversion of the analog current signal to a digital current signal. The Flash data storage (8) is electrically connected to the MCU microcontroller (2); The 4G communication antenna (9) is electrically connected to the MCU microcontroller (2) and uploads data to the cloud server platform (11) via 4G signal. The DC power supply (10) is electrically connected to the MCU microcontroller (2); The cloud server platform (11) and the 4G communication antenna (9) are wirelessly connected via 4G signal.

2. The on-load tap changer transient vibration signal acquisition and sensing system according to claim 1, characterized in that, The MCU microcontroller (2) is electrically connected to the Hall current sensor and the vibration sensor through a port, and is also electrically connected to the synchronous controller (1).

3. The on-load tap changer transient vibration signal acquisition and sensing system according to claim 2, characterized in that, The synchronous controller (1), MCU microcontroller (2), single-channel constant current source signal conditioner (4), vibration acquisition AD converter (5), current acquisition AD converter (7), Flash data storage (8), and DC power supply (10) are all externally equipped with a sun-proof and waterproof shell (12).

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