Oil leakage monitoring device for insulating oil pipeline of transformer

Abstract

The utility model provides a pipeline oil leakage monitoring system of a transformer insulating oil on-line monitoring device. The pipeline oil leakage monitoring system comprises a non-contact ultrasonic flow sensor, a data acquisition and analysis device, a communication device and a monitoring alarm device, the non-contact ultrasonic flow sensor is installed on the outer wall of an oil inlet pipeline of the insulating oil online monitoring device so as to collect the flow of insulating oil passing through the oil inlet pipeline of the insulating oil online monitoring device. The non-contact ultrasonic flow sensor is in communication connection with the data acquisition and analysis device so as to send acquired insulating oil flow information to the data acquisition and analysis device for processing through the non-contact ultrasonic flow sensor; the data acquisition and analysis device, the communication device and the monitoring alarm device are in communication connection in sequence, so that the processed flow information is sent to the monitoring alarm device through the communication device, a flow information curve is formed in the monitoring alarm device, and the oil leakage state of the pipeline of the online insulating oil monitoring device is monitored. The non-contact ultrasonic flow sensor is adopted, the installation cost can be reduced, and the monitoring accuracy is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of insulating oil monitoring, in particular to an insulating oil pipeline leakage monitoring device for a transformer. Background Art

[0002] The transformer insulating oil online monitor can timely and accurately detect the concentration and change trend of various fault characteristic gases dissolved in the insulating oil during operation, so as to control the transformer operating conditions in real time and discover the potential defects of the transformer in advance, which plays a vital role in the reliable operation of the transformer. However, the transformer body and the insulating oil online monitor need to be connected through a long oil pipeline. Once the pipeline leaks, it will directly affect the safe and stable operation of the transformer. In addition, the oil pipeline is mostly laid in a concealed manner such as direct burial of protective pipes and laying in cable trenches, so it is difficult to detect oil leaks in time.

[0003] In the prior art, for example, the Chinese invention with application number 202320497744.3 specifically discloses a pipeline oil leakage monitoring device, which is connected to the oil pipe between the transformer oil chromatogram online monitoring device and the transformer, and collects the flow and pressure of the transformer oil in the oil pipe through the oil pipe oil quantity collection device, and compares the generated flow value and pressure value with the pre-stored reference flow value and reference pressure value to monitor the oil leakage state of the oil pipe. However, the oil pipe oil quantity collection device of the patent needs to be connected to the oil pipe, so the oil pipe needs to be modified, which increases the installation cost; and the insulating oil flows directly from the inside of the oil pipe oil quantity collection device, making the oil pipe oil quantity collection device susceptible to changes in the temperature and pressure of the insulating oil, thereby reducing the collection accuracy of the oil pipe oil quantity collection device, and further reducing the accuracy of the oil pipe leakage state monitoring. Summary of the invention

[0004] In view of this, the utility model provides a transformer insulating oil pipeline oil leakage monitoring device to solve the technical problems of high installation cost and low monitoring accuracy of the existing pipeline oil leakage monitoring device.

[0005] The technical solution adopted by the utility model to solve its technical problems is:

[0006] A transformer insulating oil pipeline oil leakage monitoring device comprises an insulating oil online monitor, a non-contact ultrasonic flow sensor, a data acquisition and analysis device, a communication device and a monitoring and alarm device; the oil inlet of the insulating oil online monitor is connected to the oil outlet of the transformer via an oil inlet pipe, and the oil outlet of the insulating oil online detector is connected to the oil inlet of the transformer via an oil return pipe; the non-contact ultrasonic flow sensor is installed on the outer wall of the oil inlet pipe to collect the insulating oil flow passing through the oil inlet pipe; the non-contact ultrasonic flow sensor is communicatively connected to the data acquisition and analysis device to send the collected insulating oil flow information to the data acquisition and analysis device for processing through the non-contact ultrasonic flow sensor; the data acquisition and analysis device, the communication device and the monitoring and alarm device are communicatively connected in sequence to send the processed flow information to the monitoring and alarm device through the communication device for oil leakage status monitoring.

[0007] Preferably, the oil inlet pipe of the non-contact ultrasonic flow sensor is fixed by a fixing ring.

[0008] Preferably, the data acquisition and analysis device includes a power supply circuit, a signal processing circuit, a controller, and a liquid crystal display screen.

[0009] Preferably, the communication device includes an RS485 interface and a photoelectric conversion module.

[0010] Preferably, the data acquisition and analysis device is connected to the non-contact ultrasonic flow sensor via a high temperature resistant shielded cable.

[0011] Preferably, the data acquisition and analysis device is connected to the communication device via a cable, and the communication device is connected to the monitoring and alarm device via an optical fiber.

[0012] Preferably, the monitoring alarm device includes an auxiliary system interface screen and a background monitoring system, and the auxiliary system interface screen is connected to the background monitoring system via a TCP / IP network electrical port access module.

[0013] Preferably, a waterproof cover is provided on the outside of the non-contact ultrasonic flow sensor.

[0014] Compared with the prior art, the beneficial effects of the present invention are:

[0015] The utility model discloses a transformer insulating oil pipeline leakage monitoring device. The non-contact ultrasonic flow sensor is installed on the outer wall of the oil inlet pipe of the insulating oil online monitor. The insulating oil flow information is calculated by measuring the propagation speed of the ultrasonic wave in the oil inlet pipe. The non-contact ultrasonic flow sensor sends the collected insulating oil flow information to the data acquisition and analysis device. The data acquisition and analysis device processes the insulating oil flow information to improve the accuracy and reliability of the flow information, and transmits the processed flow information to the monitoring and alarm device through the communication device. The monitoring and alarm device receives the flow information and forms a flow information curve for monitoring and analysis by the operator. The utility model adopts a non-contact ultrasonic flow sensor, which is directly installed on the outer wall of the pipeline without changing the original pipeline, thereby reducing the installation cost. In addition, the non-contact ultrasonic flow sensor does not need to contact the fluid, so it will not be affected by the change of the physical properties of the fluid, ensuring the measurement accuracy and stability of the sensor, thereby improving the accuracy of the pipeline leakage state monitoring. At the same time, the advantages of the non-contact ultrasonic flow sensor such as high accuracy and stability are utilized to monitor the flow information of the pipeline in real time, and the flow information is directly sent to the operator monitoring system, so that abnormal conditions such as oil leakage can be discovered in the first time, greatly improving the operation reliability of the transformer. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 The utility model is a schematic diagram of the overall structure of the transformer insulating oil pipeline leakage monitoring device.

[0017] Figure 2 The utility model is a schematic diagram of the installation method of the non-contact ultrasonic flow sensor.

[0018] Figure 3 This is another overall structural schematic diagram of the transformer insulating oil pipeline oil leakage monitoring device of the utility model.

[0019] In the figure: 1-transformer; 2-insulating oil online monitor; 31-oil inlet pipe; 32-oil return pipe; 4-non-contact ultrasonic flow sensor; 5-data acquisition and analysis device; 51-power supply circuit; 52-signal processing circuit; 53-controller; 54-liquid crystal display; 6-communication device; 61-RS485 interface; 62-photoelectric conversion module; 7-monitoring and alarm device; 71-auxiliary system interface screen; 72-background monitoring system; 8-cable; 9-optical fiber; 10-TCP / IP network electrical port access module. DETAILED DESCRIPTION

[0020] The technical scheme and technical effects of the embodiments of the present invention are further described in detail below in conjunction with the accompanying drawings of the present invention.

[0021] Please see Figure 1A transformer insulating oil pipeline oil leakage monitoring device comprises an insulating oil online monitor 2, a non-contact ultrasonic flow sensor 4, a data acquisition and analysis device 5, a communication device 6 and a monitoring and alarm device 7; the oil inlet of the insulating oil online monitor 2 is connected to the oil outlet of the transformer 1 through an oil inlet pipe 31, and the oil outlet of the insulating oil online detector 2 is connected to the oil inlet of the transformer 1 through an oil return pipe 32; the non-contact ultrasonic flow sensor 4 is installed on the outer wall of the oil inlet pipe 31 to collect the insulating oil flow passing through the oil inlet pipe 31; the non-contact ultrasonic flow sensor 4 is communicatively connected to the data acquisition and analysis device 5 to send the collected insulating oil flow information to the data acquisition and analysis device 5 for processing through the non-contact ultrasonic flow sensor 4; the data acquisition and analysis device 5, the communication device 6 and the monitoring and alarm device 7 are communicatively connected in sequence to send the processed flow information to the monitoring and alarm device 7 through the communication device 6 to monitor the oil leakage status.

[0022] The utility model discloses a transformer insulating oil pipeline leakage monitoring device. The non-contact ultrasonic flow sensor is installed on the outer wall of the oil inlet pipe of the insulating oil online monitor. The insulating oil flow information is calculated by measuring the propagation speed of the ultrasonic wave in the oil inlet pipe. The non-contact ultrasonic flow sensor sends the collected insulating oil flow information to the data acquisition and analysis device. The data acquisition and analysis device processes the insulating oil flow information to improve the accuracy and reliability of the flow information, and transmits the processed flow information to the monitoring and alarm device through the communication device. The monitoring and alarm device receives the flow information and forms a flow information curve for monitoring and analysis by the operator. The utility model adopts a non-contact ultrasonic flow sensor, which is directly installed on the outer wall of the pipeline without changing the original pipeline, thereby reducing the installation cost. In addition, the non-contact ultrasonic flow sensor does not need to contact the fluid, so it will not be affected by the change of the physical properties of the fluid, ensuring the measurement accuracy and stability of the sensor, thereby improving the accuracy of the pipeline leakage state monitoring. At the same time, the advantages of the non-contact ultrasonic flow sensor such as high accuracy and stability are utilized to monitor the flow information of the pipeline in real time, and the flow information is directly sent to the operator monitoring system, so that abnormal conditions such as oil leakage can be discovered in the first time, greatly improving the operation reliability of the transformer.

[0023] Specifically, when the insulating oil online monitor is running, the oil circuit in the entire system is stable and will not produce large flow changes. However, when there is a leak in the insulating oil online monitor, there will be abnormal flow changes in the oil circuit. Therefore, it is possible to accurately determine whether the insulating oil online monitor has signs of oil leakage by monitoring whether there are abnormal flow changes in the pipeline of the insulating oil online monitor. Among them, the non-contact ultrasonic flow sensor uses the relationship between the propagation speed of ultrasound in the fluid and the flow rate to measure the flow rate. The sensor emits ultrasonic pulses. When the ultrasonic wave encounters fluid flow, its propagation speed will change. By measuring the time difference or frequency change of the ultrasonic wave and the flow rate of the insulating oil, the flow rate of the insulating oil can be calculated. Then the non-contact ultrasonic flow sensor converts the insulating oil flow information into a 4-20mA current and transmits it to the data acquisition and analysis device. The communication device transmits the flow information in the data acquisition and analysis device to the monitoring and alarm system. The monitoring and alarm system forms a data curve with the flow information for real-time monitoring by the operating personnel. When the data curve produces abnormal fluctuations, it can be explained that the pipeline of the insulating oil online monitor has leaked oil, and the staff can be sent to the insulating oil online monitor for inspection and maintenance. In some embodiments, please refer to Figure 2 , the non-contact sensor 4 can be clamped (such as Figure 2 a, the non-contact sensor is clamped on the outer wall of the oil inlet pipe by a clamp assembly), bundled (such as Figure 2 b, fix the non-contact sensor to the outer wall of the oil inlet pipe with a strapping tape), a buckle (such as Figure 2 c, fix the non-contact sensor to the outer wall of the oil inlet pipe by means of snap screws), bolts, etc., which are not limited here. In some embodiments, the monitoring alarm device refers to the integrated monitoring background of the substation.

[0024] Furthermore, the non-contact ultrasonic flow sensor 4 is fixed to the insulating oil online monitor oil inlet pipeline 3 by a fixing ring to enhance the stability of the non-contact ultrasonic flow sensor 4 and prevent the problem of inaccurate insulating oil flow information collected due to unstable installation.

[0025] For further information, see Figure 3The data acquisition and analysis device 5 includes a power supply circuit 51, a signal processing circuit 52, a controller 53, and a liquid crystal display screen 54. The power supply circuit 51 provides power to the signal processing circuit 52, the controller 53, and the liquid crystal display screen 54. The controller 53 is used to control the signal processing circuit 51 and the liquid crystal display screen 52. The controller 53 receives the insulating oil flow information collected by the non-contact ultrasonic flow sensor 4 and sends it to the signal processing circuit 52. The signal processing circuit 52 amplifies, filters, and stabilizes the insulating oil flow information collected by the non-contact ultrasonic flow sensor 4 to further optimize the measurement accuracy and adaptability of the non-contact ultrasonic flow sensor, thereby ensuring the accuracy and reliability of the signal and providing support for subsequent signal transmission and data processing. The controller 53 sends the processed flow information to the liquid crystal display screen 54 for display. In some embodiments, an alarm value customization function is provided in the data acquisition and analysis device. The data acquisition and analysis device can set the alarm value of the system by analyzing the flow information. When the insulating oil flow information collected by the non-contact ultrasonic flow sensor is abnormal and reaches the alarm value, the data acquisition and analysis device transmits the alarm information to the monitoring alarm device through the communication device to remind the background monitoring personnel, and can also display the alarm information on the LCD screen to remind on-site staff.

[0026] Further, please refer again to Figure 3 The communication device 6 includes an RS485 interface 61 and an optoelectronic conversion module 62. The insulating oil flow information processed by the data acquisition and analysis device is converted into a differential signal through the RS485 interface, and transmitted to the receiving end through a twisted pair. The receiving end converts the received differential signal into a data signal, and transmits the data signal to the optoelectronic conversion module. The signal processed by the data acquisition and analysis device is converted into a digital signal that can be recognized by optical cable communication through the optoelectronic conversion module, and finally the insulating oil flow information is transmitted to the monitoring alarm device through the optical fiber. By using the RS485 interface and the optoelectronic conversion module to transmit the insulating oil flow information, common mode interference can be reduced, making data transmission more stable and reliable, and the loss in the signal transmission process can be reduced, and the quality of data transmission can be improved, thereby ensuring the accuracy of the insulating oil flow information; at the same time, the RS485 interface and the optoelectronic conversion module can also improve the transmission efficiency of the signal, thereby improving the timeliness of pipeline oil leakage monitoring, so that the staff can find abnormal conditions such as oil leakage in the first time, which greatly improves the operation reliability of the transformer.

[0027] Furthermore, the data acquisition and analysis device 5 is connected to the non-contact ultrasonic flow sensor 4 through a high temperature resistant shielded cable. The non-contact ultrasonic flow sensor 4 converts the collected insulating oil flow information into 4-20mA current and transmits it to the data acquisition and analysis device 5 through the high temperature resistant shielded cable, thereby adapting to the characteristics of high temperature and strong electromagnetic interference of large transformers during operation, and effectively improving the accuracy of data transmission.

[0028] Furthermore, the data acquisition and analysis device 5 is connected to the communication device 6 via a cable 8, and the communication device 6 is connected to the monitoring and alarm device 7 via an optical fiber 9. The signal of the data acquisition and analysis device 5 is transmitted to the communication device 6 via the cable, and the signal of the communication device 6 is transmitted to the monitoring and alarm device 7 via the optical fiber. By using cables and optical fibers for signal transmission, electromagnetic interference can be avoided and the accuracy of data transmission can be improved.

[0029] For further information, see Figure 3 The monitoring alarm device 7 includes an auxiliary system interface screen 71 and a background monitoring system 72. The auxiliary system interface screen 71 is connected to the background monitoring system 72 through a TCP / IP network electrical port access module 10. The auxiliary system interface screen is used to provide an interface between the communication device and the background monitoring system. The communication device transmits the flow information processed by the data acquisition and analysis device to the auxiliary system interface screen through optical fiber. The auxiliary system interface screen is provided with multiple interfaces and can be connected to the background monitoring system 72 through a TCP / IP network electrical port access module 10, thereby achieving the accuracy of data transmission. The flow information forms a data curve through the background monitoring system for monitoring and analysis by the operating personnel, thereby completing the pipeline oil leakage alarm function of the insulating oil online monitor.

[0030] Furthermore, a waterproof cover is provided on the outside of the non-contact ultrasonic flow sensor 4 to prevent corrosion of the non-contact ultrasonic flow sensor by rain and snow, effectively resist external influences such as rain and snow, and increase the service life of the non-contact ultrasonic flow sensor.

[0031] The above disclosure is only a preferred embodiment of the present invention, and it certainly cannot be used to limit the scope of the present invention. A person skilled in the art can understand that all or part of the processes of the above embodiments and equivalent changes made according to the claims of the present invention still fall within the scope of the present invention.

Claims

1. A transformer insulating oil pipeline leakage monitoring device, characterized in that: It comprises an insulating oil online monitor, a non-contact ultrasonic flow sensor, a data acquisition and analysis device, a communication device and a monitoring and alarm device; the oil inlet of the insulating oil online monitor is connected to the oil outlet of the transformer via an oil inlet pipe, and the oil outlet of the insulating oil online detector is connected to the oil inlet of the transformer via an oil return pipe; the non-contact ultrasonic flow sensor is installed on the outer wall of the oil inlet pipe to collect the insulating oil flow passing through the oil inlet pipe; the non-contact ultrasonic flow sensor is communicatively connected to the data acquisition and analysis device to send the collected insulating oil flow information to the data acquisition and analysis device for processing through the non-contact ultrasonic flow sensor; the data acquisition and analysis device, the communication device and the monitoring and alarm device are communicatively connected in sequence to send the processed flow information to the monitoring and alarm device through the communication device for oil leakage status monitoring.

2. The transformer insulating oil pipeline leakage monitoring device according to claim 1 is characterized in that: The non-contact ultrasonic flow sensor is fixed to the oil inlet pipe via a fixing ring.

3. The transformer insulating oil pipeline leakage monitoring device according to claim 1 is characterized in that: The data acquisition and analysis device comprises a power supply circuit, a signal processing circuit, a controller and a liquid crystal display screen.

4. The transformer insulating oil pipeline leakage monitoring device according to claim 1 is characterized in that: The communication device comprises an RS485 interface and a photoelectric conversion module.

5. The transformer insulating oil pipeline leakage monitoring device according to claim 1 is characterized in that: The data acquisition and analysis device is connected to the non-contact ultrasonic flow sensor via a high temperature resistant shielded cable.

6. The transformer insulating oil pipeline leakage monitoring device according to claim 5 is characterized in that: The data acquisition and analysis device is connected to the communication device via a cable, and the communication device is connected to the monitoring and alarm device via an optical fiber.

7. The transformer insulating oil pipeline leakage monitoring device according to claim 6 is characterized in that: The monitoring alarm device comprises an auxiliary system interface screen and a background monitoring system. The auxiliary system interface screen is connected to the background monitoring system via a TCP / IP network electrical port access module.

8. The transformer insulating oil pipeline leakage monitoring device according to claim 1 is characterized in that: A waterproof cover is arranged outside the non-contact ultrasonic flow sensor.

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