A multifunctional oil-immersed transformer state monitoring device

Abstract

The utility model discloses a kind of multifunctional oil-immersed transformer condition monitoring devices, specifically related to the oil level gauge field of oil-immersed power transformer, mainly including tubular oil level gauge. The utility model is composed of integrated device of several parts such as tubular oil level gauge tube seat, control box, pressure relief valve, pressure sensor, oil level sensor, temperature sensor, Beidou position sensor, camera recorder, etc. installed on oil-immersed transformer, device is compatible with traditional product tubular oil level gauge. User only needs to fix the screw port of tubular oil level gauge tube seat lower end to the flange of oil-immersed transformer and tighten, then connect cable to transformer low voltage side terminal, and it can be used. After transformer is powered on, device is put into work, transformer oil temperature, pressure and transformer oil level, geographic position information, field environmental influence data can be monitored in real time, and monitoring data is monitored by APP mode and mobile terminal in situ pole control;Remote monitoring is realized by 4G / 5G mode.

Description

Technical Field

[0001] This utility model relates to the field of power transmission and transformation technology, and in particular to a multifunctional online monitoring device for oil-immersed transformers. Background Technology

[0002] Power transformers are the core equipment of power distribution equipment and occupy a vital position in the power system. Their good operating condition is an important foundation for ensuring the safe and reliable operation of the power system.

[0003] With the rapid construction and development of my country's ultra-high voltage power grid, especially the rapid advancement of photovoltaic power generation and energy storage technology, the demand for power transformers, especially oil-immersed transformers, is surging and increasing dramatically, and overseas market demand is also very strong.

[0004] Although transformers are the core and critical equipment for converting high-voltage power distribution into low-voltage mains power, the vast majority of transformers are installed outdoors in extremely harsh environments, and some are located in very remote areas. Most transformers in use are not equipped with monitoring devices, and their operating status can only be understood through background data analysis of power load. This results in many transformers operating beyond their capacity or with existing defects, leading to high transformer and line losses and a high failure rate.

[0005] Large power transformers installed in substations and distribution rooms have relatively complete relay protection functions such as pressure, temperature, and gas protection. When a transformer outgoing line fault occurs, the main transformer can be protected to ensure the safe operation of the transformer.

[0006] However, only a very small number of transformers have the above-mentioned conditions. The vast majority of distribution transformers, including public transformers and private transformers, are located on the user side and are installed on outdoor poles. In this case, the transformers do not have relay protection devices and only have local oil level monitoring functions. The oil temperature and pressure of the transformers are unknown, which creates safety hazards for the transformers.

[0007] In summary, many distribution transformers are located in remote areas with harsh operating environments. Coupled with a lack of protective measures, they are often subject to unauthorized wiring, illegal electricity use, and even more serious issues such as electricity theft and loss of electrical equipment. The application of this utility model can effectively solve these problems. Summary of the Invention

[0008] The technical problem to be solved by this utility model is that, in view of the fact that existing oil-immersed transformers generally lack effective online monitoring methods and cannot keep track of the transformer oil temperature, working pressure, oil level, on-site environmental video and geographical location information in real time, resulting in many safety hazards, a multi-functional oil-immersed transformer condition monitoring device is provided.

[0009] To address the aforementioned technical problems, this utility model provides a multifunctional oil-immersed transformer condition monitoring device, including a control box, a main oil pipe, an oil temperature and level transmitter, a pressure relief valve, and a pressure sensor. It also includes a built-in camera and a built-in Beidou positioning module. The oil temperature and level transmitter, pressure relief valve, and pressure sensor are connected to the control box via screw connections. The lower end of the control box is integrally fixed to the main oil pipe via screw connections. The lower end of the main oil pipe has a connecting screw connection for fixing to the oil tank flange of the oil-immersed transformer. The main oil pipe contains a float and a level sensor and an oil temperature sensor fixing tube for insertion into the transformer oil. The pressure sensor, temperature sensor, level sensor, built-in Beidou positioning module, and built-in camera are all electrically connected to the controller within the control box to transmit monitoring information to the controller for signal acquisition. The controller can also connect to a field handheld terminal via wireless low-power mode or WIFI, and achieve remote monitoring via a 4G / 5G communication module.

[0010] Because this application integrates the oil temperature and level transmitter, pressure relief valve, pressure sensor, built-in camera, and built-in Beidou positioning module into a control box compatible with the tubular oil level gauge, through the above-mentioned integrated design, a single device can achieve comprehensive online monitoring of transformer oil temperature, pressure, oil level, on-site images, and geographical location information. It can also achieve local pole-mounted control and remote monitoring through various communication methods, thereby enabling timely detection of abnormal situations such as unexpected use and position changes of the transformer, improving the operational safety and maintenance efficiency of the transformer.

[0011] Furthermore, the built-in camera is used to record images of the environment surrounding the transformer. By integrating the built-in camera into the control box, real-time video data of the transformer installation site can be obtained, providing visual evidence for electricity inspection and anti-theft measures.

[0012] Furthermore, the built-in BeiDou positioning module is used to trigger an alarm in the background system when a change in the transformer installation location information is detected. By integrating the built-in BeiDou positioning module into the control box, the geographical location of the distribution transformer can be monitored in real time. Once the transformer is found to have been illegally moved, the background system will immediately issue an alarm and arrange for maintenance personnel to conduct an on-site inspection.

[0013] First: This utility model provides a multi-functional oil-immersed transformer condition monitoring device, which is a structural design that is fully compatible with the "tubular oil level gauge" used on site and can completely replace the original device.

[0014] Second: This utility model provides a multi-functional oil-immersed transformer condition monitoring device. After installation, it can achieve "functional compatibility" with the original product even without power. It can realize the transformer oil level by observing the observation window and the transformer pressure release by the pressure relief valve.

[0015] Third: This utility model provides a multifunctional oil-immersed transformer condition monitoring device, and the control box of the device is the core component of this utility model. The oil temperature sensor, pressure sensor, liquid level sensor, pressure relief valve, main oil pipe, etc. are all connected to the control box through screw interfaces to achieve an airtight effect.

[0016] Fourth: This utility model provides a controller motherboard in the control box of a multifunctional oil-immersed transformer condition monitoring device, which can collect and process pressure, oil temperature and liquid level information collected on site, and can also exchange data with the site through the 485 communication port and DO output line to realize local control.

[0017] Fifth: This utility model provides a control box for a multifunctional oil-immersed transformer condition monitoring device that can connect to a field handheld terminal via APP through wireless low power and WIFI to obtain field data, and realize parameter modification and local control, thereby achieving on-site operation control at the pole.

[0018] Sixth: This utility model provides a control box for a multifunctional transformer operation status monitoring device that can communicate with the backend via 4G / 5G transmission to realize real-time monitoring of remote equipment and formulate operation and maintenance plans.

[0019] Seventh: This utility model provides a multifunctional oil-immersed transformer condition monitoring device where the controller and sensor are connected via a cable. The cable is pre-installed, eliminating the need for user wiring. The user only needs to connect the LN power cable from the controller through the waterproof connector to the low-voltage side terminal of the transformer.

[0020] Eighth: The controller of this utility model's multifunctional oil-immersed transformer condition monitoring device has been equipped with a data storage device that retains data even after power failure. It can remotely transmit and download historical data of transformer operation, fit it into a data curve, realize transformer operation status analysis, and provide it to power inspection personnel.

[0021] Ninth: The controller of the oil-immersed transformer condition monitoring device of this utility model has an ambient temperature monitoring function, which can compare the transformer oil temperature with the ambient temperature, monitor whether the transformer is in working condition, and determine whether the transformer oil temperature is abnormal, for reference by electrical inspection personnel.

[0022] Tenth, the controller of the multifunctional oil-immersed transformer condition monitoring device of this utility model has video data of the transformer installation site, which can effectively detect whether there are various unintended uses of the distribution transformer.

[0023] Eleventh, the controller of the multifunctional oil-immersed transformer status monitoring device of this utility model has Beidou positioning information of the transformer installation location, which can effectively detect whether there is illegal relocation or damage to the distribution transformer. Attached Figure Description

[0024] To more clearly illustrate the technical solutions in the embodiments of this utility model, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0025] Figure 1 This is a schematic diagram of the external structure of a multifunctional oil-immersed transformer condition monitoring device provided in an embodiment of the present invention. 1. Oil temperature and level transmitters; 2. Pressure relief valve; 3. Control box (containing a controller); 4. Pressure sensor; 5. Waterproof connector for the control box; 6. LN power cord; 7. Liquid level observation window; 8. Red and green dual-color liquid level tank; 9. Main oil pipe of the device; 10. Oil pipe connecting to transformer threaded joint; 11. Movable aluminum pipe; 12. Float; 13. Fixing pipes for liquid level sensor and oil temperature sensor; 14. Built-in camera.

[0026] Figure 2 This is an electrical schematic diagram of a controller for a multifunctional oil-immersed transformer operation status monitoring device provided in an embodiment of the present invention. Detailed Implementation

[0027] In the following description, specific details such as particular system structures and techniques are set forth for illustrative purposes and not for limitation, in order to provide a thorough understanding of the embodiments of the present invention. However, those skilled in the art will understand that the present invention can be implemented in other embodiments without these specific details. In other instances, detailed descriptions of well-known systems, apparatuses, circuits, and methods are omitted so as not to obscure the description of the present invention with unnecessary detail.

[0028] Basic components:

[0029] This utility model provides a multifunctional oil-immersed transformer condition monitoring device, which consists of an oil temperature and level transmitter (1), a pressure relief valve (2), a control box (3), a pressure sensor (4), and a main oil pipe (9). The control box (3) is the main body of the device, and the other parts are fixed to the control box (3) by screws to form an integrated structure. The oil temperature and level transmitter (1) and the pressure sensor (4) are electrically connected to the control box (3) by cables through the waterproof connector (5) of the control box, and are connected to the power grid for power supply through the LN power line (6).

[0030] The main oil pipe (9) of the device consists of a dual-color liquid level tank (8), a movable aluminum pipe (11), and a float (12). The position of the dual-color liquid level tank (8), i.e., the transformer oil level, can be viewed through a transparent liquid level observation window (7) to determine whether the transformer is short of oil. The main oil pipe (9) of the device is fixed to the control box (3) through the upper screw joint and fixed to the oil-immersed transformer tank through the lower connecting screw joint (10).

[0031] The oil temperature and level transmitter (1) consists of a temperature sensor and a level transmitter. The sensors are protected by a mounting tube (13) at the bottom for the level sensor and oil temperature sensor. The oil temperature and level transmitter (1) is fixed to the control box (3) by a screw thread. The mounting tube (13) for the level sensor and oil temperature sensor, which is a metal slender rod structure, passes through the control box (3), the main oil pipe (9) of the device, and the movable aluminum pipe (11) and float (12). The oil temperature and level transmitter (1) is connected to the control box (3) by a cable.

[0032] The installed liquid level sensor and oil temperature sensor fixing tube (13) of a multifunctional oil-immersed transformer condition monitoring device are inserted into the transformer oil to measure the oil temperature and liquid level. The float (12) floats on the surface of the transformer oil and moves the movable aluminum tube (11) up and down by the rise and fall of the liquid level. The position of the two-color liquid level tank (8) on the upper part of the movable aluminum tube (11) can be viewed through the liquid level observation window (7).

[0033] The pressure relief valve (2) and pressure sensor (4) are fixed to the control box (3) through a screw thread and maintain the same pressure with the oil tank of the oil-immersed transformer through the air passage. The pressure sensor (4) transmits the detected oil tank pressure information to the controller of the control box (3) through a cable. The pressure relief valve (2) is a mechanical structure device, but the pressure relief valve (2) will open to release pressure when the oil tank pressure reaches the set pressure.

[0034] The control box (3) has a metal shell structure and integrates a built-in camera (14) and a controller PCB board. The Beidou positioning module, 4G / 5G module, WIFI module and main control chip are all deployed on the PCB board and obtain working power through the LN power line (6). The sensor connection cable is connected to the internal controller through the waterproof connector (5) of the control box (3).

[0035] The controller of the control box (3) communicates with the field equipment through the USB interface on the PCB board; it controls the mobile terminal locally through the WIFI module via the APP; and it realizes remote communication through the 4G / 5G module, transmitting the real-time information of transformer operation, geographical location information and image information to the system backend.

[0036] Functionality

[0037] Measurement function

[0038] Connect the power line LN(6) of the monitoring device to the corresponding position on the low-voltage side of the transformer. The device will be in working condition after the transformer is powered on.

[0039] a) Oil temperature and liquid level measurement:

[0040] The oil temperature and liquid level information of the oil-immersed transformer detected by the level sensor and the oil temperature sensor fixed tube (13) inserted into the oil of the oil-immersed transformer are sent to the controller in the control box (3) through the cable to realize the measurement of oil temperature and liquid level.

[0041] b) Transformer oil level measurement:

[0042] When the transformer is working, the oil level inside the transformer may rise or fall, causing the float (12) to rise and fall, which in turn causes the movable aluminum tube (11) to rise and fall. The transformer's liquid level is monitored by observing the color change of the red and green liquid level tank (8) through the liquid level observation window (7).

[0043] c) Pressure measurement:

[0044] Under normal circumstances, the transformer oil does not fill the entire tank. The main oil pipe (9) of the device is filled with a mixture of air and oil gas. As the transformer loss increases, the oil temperature rises, which will cause the transformer oil level to rise. The pressure in the gas chamber will rise, and the pressure sensor (4) will detect the pressure signal and transmit it to the controller in the control box (3) via cable to realize the pressure measurement in the transformer oil tank.

[0045] d) Pressure relief measurement:

[0046] When the pressure in the air chamber reaches the set value of the pressure relief valve (2), the pressure relief valve will open to release pressure. The pressure sensor (4) will detect the pressure value, time and number of releases during the pressure drop.

[0047] e) Ambient temperature measurement

[0048] The temperature sensor is deployed on the PCB board of the controller inside the control box (3) and can detect the ambient temperature signal in real time.

[0049] Video recording function:

[0050] The camera should be positioned over key locations on the transformer, namely the high-voltage and low-voltage terminal areas. If any abnormalities are detected, an alarm should be triggered immediately, and the images should be captured as evidence.

[0051] Geographic location signal:

[0052] This utility model provides an online real-time monitoring device that can monitor the location information of distribution transformers through the Beidou positioning chip mounted on the controller in the control box, and immediately issue an alarm message when a change in the installation location of the transformer is detected.

[0053] Local control function:

[0054] This utility model provides an online real-time monitoring device that can be connected via a waterproof terminal on the control box, such as... Figure 2 The DO alarm output and 485 communication line shown are connected to field control devices such as fusion terminals to achieve local control.

[0055] Pole-down control function:

[0056] This utility model provides an online real-time monitoring device that can, for example, Figure 2 The device uses wireless micro-power, WIFI, and other methods to connect to a handheld device via an app, enabling control from below.

[0057] Remote control:

[0058] This utility model provides an online real-time monitoring device that can, for example, Figure 2 The 4G / 5G method shown connects to the control backend for data connection, enabling remote control.

Claims

1. A multifunctional oil-immersed transformer condition monitoring device, characterized in that, The device includes an oil temperature and level transmitter (1), a pressure relief valve (2), a pressure sensor (4), a control box (3), a main oil pipe (9), a built-in camera (14), and a built-in Beidou positioning module. The oil temperature and level transmitter (1), the pressure relief valve (2), and the pressure sensor (4) are connected to the control box (3) via screws. The lower end of the control box (3) is fixed to the main oil pipe (9) via a screw. The lower end of the main oil pipe (9) is fixed to the oil tank flange screw of the oil-immersed transformer via a connecting screw (10). The multifunctional oil-immersed transformer condition monitoring device also includes a float (12) and a liquid level sensor and an oil temperature sensor fixing tube (13) for insertion into the transformer oil. The pressure sensor, temperature sensor, liquid level sensor, built-in Beidou position module and built-in camera (14) are all electrically connected to the controller in the control box (3) for sending monitoring information to the controller for signal acquisition. The controller is also used to connect to the field handheld terminal via wireless low power and WIFI, and to realize remote monitoring via 4G / 5G communication module.

2. The multifunctional oil-immersed transformer condition monitoring device according to claim 1, characterized in that: The built-in camera (14) is used to capture images of the environment surrounding the transformer.

3. The multifunctional oil-immersed transformer condition monitoring device according to claim 1, characterized in that: The built-in Beidou positioning module is used to trigger an alarm in the background system when a change in the transformer installation location information is detected.

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