Automatic pressure regulating and monitoring device for oil pressure sealing test of transformer

Abstract

The utility model discloses an automatic pressure regulating and monitoring device for a transformer oil pressure sealing test, which relates to the technical field of transformer sealing detection and comprises a first pressure transmitter, a second pressure transmitter, a first pressure sensor, a second pressure sensor and a second pressure sensor, and the first pressure transmitter is arranged on the outer side of the bottom of a transformer body oil tank and connected with the transformer body oil tank through an oil injection valve; the second pressure transmitter is arranged at the upper end of the transformer body oil tank and connected with the transformer body oil tank; the pressure relief valve is arranged at the upper end of the transformer body oil tank and used for releasing pressure of the transformer body oil tank; the oil pressure adjusting device is connected with the oil conservator through an oil conservator oil injection valve and connected with a top valve on the transformer body oil tank through an oil outlet pipe; the output end of the first pressure transmitter and the output end of the second pressure transmitter are connected with the oil pressure adjusting device. An oil guide pipe is arranged between the first pressure transmitter and the second pressure transmitter. According to the utility model, the automatic pressure regulation monitoring technology is adopted, so that the accurate control of the pressure sealing test process of the transformer is realized, and the test precision and efficiency are improved.

Description

Technical Field

[0001] The utility model relates to the technical field of transformer sealing detection, in particular to an automatic voltage regulating monitoring device for transformer oil pressure sealing test. Background Art

[0002] In order to ensure that the sealing performance of oil-immersed power transformers meets the requirements of GBT 6451-2023 standard and related maintenance, on-site sealing test and acceptance specifications, it is necessary to apply corresponding pressure according to the voltage level after the transformer is installed or overhauled, and maintain it within the specified time to ensure its sealing performance. During the transformer pressure sealing test, due to changes in ambient temperature, the volume of the insulating oil will expand and contract accordingly, which may cause the internal pressure of the oil tank to exceed the designed mechanical strength limit, or be lower than 90% of the oil pressure value applied in the sealing test. Therefore, it is necessary to effectively monitor the entire process of the transformer pressure sealing test to ensure that the test pressure is accurate and the equipment is safe.

[0003] If effective monitoring cannot be implemented, it may cause permanent deformation of the transformer and affect the accuracy of the test, while increasing the risk of insulating oil leakage. In order to ensure the accuracy of the transformer pressure seal test and the safety of the equipment, sufficient human and material resources must be invested to manually adjust and monitor the test pressure.

[0004] In response to the above problems, some inflation monitoring devices have been applied to transformer oil pressure sealing tests. However, these devices usually have some problems, such as the need for manual pressure adjustment, low accuracy, unstable monitoring, and complex operation. In addition, due to the particularity of transformer pressure sealing tests, the devices must have high reliability, high safety, and high accuracy, but the inflation monitoring devices currently on the market cannot meet the requirements of different types of oil storage cabinet transformer sealing tests.

[0005] Therefore, it is necessary to develop a new type of automatic voltage regulation monitoring device for transformer oil pressure seal test to improve the accuracy and efficiency of the test and reduce the workload of manual monitoring. Utility Model Content

[0006] The technical problem to be solved by the utility model is to solve the deficiencies in the prior art and to design an automatic voltage regulation and monitoring device for transformer oil pressure sealing test, which can realize automatic voltage regulation and monitoring of the transformer pressure sealing test process, ensure the accuracy of the test pressure and the safety of the equipment, improve the accuracy and efficiency of the test, and reduce the workload of manual monitoring.

[0007] The technical solution adopted by the utility model to solve its technical problems is:

[0008] An automatic voltage regulation monitoring device for transformer oil pressure sealing test, comprising:

[0009] The first pressure transmitter is arranged at the outer side of the bottom of the transformer body oil tank and connected to the transformer body oil tank through an oil filling valve;

[0010] The second pressure transmitter is arranged at the upper end of the transformer body oil tank and connected to the transformer body oil tank;

[0011] A pressure relief valve is provided at the upper end of the transformer body oil tank and is used to release the pressure of the transformer body oil tank;

[0012] The oil pressure regulating device is connected to the oil conservator through the oil conservator filling valve and is connected to the top valve on the transformer body oil tank through the oil outlet pipe;

[0013] The output ends of the first pressure transmitter and the second pressure transmitter are connected to the oil pressure regulating device; and an oil guide pipe is arranged between the first pressure transmitter and the second pressure transmitter.

[0014] Furthermore, the oil pressure regulating device comprises:

[0015] Oil pump, used to extract insulating oil from the oil storage tank and inject it into the transformer, and provide oil pressure;

[0016] Electronic return valve, used to adjust the oil pressure and return the transformer oil to the oil conservator for pressure relief;

[0017] A wireless receiver, used to receive pressure data from a wireless pressure transmitter and transmit the pressure data to a control module via an RS485 bus;

[0018] The control module automatically adjusts the oil pump and the electronic return valve according to the pressure data and controls the display output;

[0019] Display module, used for interacting with users;

[0020] Operation button, used to start and stop the oil pump;

[0021] The input end and output end of the oil pump are connected to the oil inlet pipe and the oil outlet pipe respectively, a one-way valve is arranged on the oil outlet pipe, the input end of the electronic reflux valve is connected to the oil outlet pipe of the output end of the one-way valve, and the output end of the electronic reflux valve is connected to the oil inlet pipe;

[0022] The output end of the control module is connected to the oil pump, the operation button and the input end of the wireless receiver are connected to the control module, and the output end of the control module is connected to the display module.

[0023] As a further technical solution of the utility model, the control module adopts Mitsubishi's FX3U-16MR PLC controller.

[0024] As a further technical solution of the present utility model, the first pressure transmitter and the second pressure transmitter are Lora pressure transmitters.

[0025] As a further technical solution of the present utility model, the wireless receiver is a Lora receiver.

[0026] As a further technical solution of the utility model, an exhaust valve is also arranged between the oil outlet pipe and the top valve.

[0027] As a further technical solution of the utility model, the second pressure transmitter is arranged on the transformer body oil tank through an adsorption magnet.

[0028] As a further technical solution of the present utility model, the second pressure transmitter and the pressure relief valve are at the same horizontal position.

[0029] Compared with the prior art, the utility model has the following beneficial effects:

[0030] 1. The utility model controls the oil pump to deliver oil to the transformer body oil tank. When the oil pressure in the transformer body oil tank is too high, the pressure is released through the electronic return valve. The oil pump is set with automatic control and manual control. The pressure information of the first pressure transmitter and the second pressure transmitter is received through the wireless receiver. The oil pump and the electronic return valve are automatically controlled according to the pressure information to realize the oil delivery operation to the transformer body oil tank.

[0031] 2. The utility model realizes precise control of the transformer pressure sealing test process by adopting automatic voltage regulation and monitoring technology, adopts the insulating oil of the transformer oil storage cabinet to perform the transformer oil pressure sealing test, and realizes fully automated and precise control of the oil pressure through a programmable logic controller.

[0032] 3. The wireless pressure transmitter can obtain oil pressure data in real time, ensuring accurate control of oil pressure changes. The wireless pressure transmitter can also monitor the oil pressure inside the transformer in real time. The wireless pressure transmitter transmits the real-time monitored oil pressure data to the PLC, which then transmits the data to the configuration screen for display.

[0033] 4. The utility model of the transformer oil pressure seal test automatic voltage regulation monitoring device realizes accurate control of the transformer pressure seal test process by adopting automatic voltage regulation and monitoring technology, improves the accuracy and efficiency of the test, reduces the workload of manual monitoring, and ensures the safety and reliability of the transformer. BRIEF DESCRIPTION OF THE DRAWINGS

[0034] Figure 1 This is a structural diagram of an automatic voltage regulating monitoring device for transformer oil pressure sealing test proposed by the utility model;

[0035] As shown in the figure:

[0036] 1-first pressure transmitter, 2-second pressure transmitter, 3-pressure relief valve, 4-oil pressure regulating device, 5-oil guide pipe;

[0037] 10-transformer body oil tank, 20-oil storage cabinet;

[0038] 101- oil filling valve, 102- top valve;

[0039] 201-oil storage tank filling valve, 202-fourth valve, 203-gas relay, 204-fifth valve;

[0040] 401- oil pump, 402- electronic return valve;

[0041] 411- oil inlet pipe, 412- oil outlet pipe, 413- one-way valve. DETAILED DESCRIPTION

[0042] The following describes the specific implementation of the utility model in conjunction with the accompanying drawings and embodiments:

[0043] It should be noted that the structures, colors, proportions, sizes, etc. illustrated in the drawings of this specification are only used to match the contents disclosed in the specification so that people familiar with this technology can understand and read them, and are not used to limit the conditions under which the present invention can be implemented. Any structural modification, change in proportional relationship or adjustment of size should still fall within the scope of the technical contents disclosed in the present invention without affecting the effects and purposes that can be achieved by the present invention.

[0044] At the same time, the terms such as "upper", "lower", "left", "right", "middle" and "one" cited in this specification are only for the convenience of description and are not used to limit the scope of the implementation of the present utility model. Changes or adjustments to their relative relationships should be regarded as the scope of the implementation of the present utility model without substantially changing the technical content.

[0045] like Figure 1 As shown, the utility model provides an automatic voltage regulation monitoring device for transformer oil pressure sealing test, comprising:

[0046] The first pressure transmitter 1 is arranged at the outer side of the bottom of the transformer body oil tank 10 and connected to the transformer body oil tank 10 through the oil filling valve 101;

[0047] The second pressure transmitter 2 is arranged at the upper end of the transformer body oil tank 10 and connected to the transformer body oil tank 10;

[0048] The pressure relief valve 3 is arranged at the upper end of the transformer body oil tank 10 and is used to release the pressure of the transformer body oil tank 10;

[0049] The oil pressure regulating device 4 is connected to the oil conservator 20 through the oil conservator filling valve 201, and is connected to the top valve 102 on the transformer body oil tank 10 through the oil outlet pipe 412;

[0050] The output ends of the first pressure transmitter 1 and the second pressure transmitter 2 are connected to an oil pressure regulating device 4 ; an oil guide pipe 5 is arranged between the first pressure transmitter 1 and the second pressure transmitter 2 .

[0051] In the embodiment of the utility model, the maximum oil pressure and the minimum oil pressure in the transformer body oil tank are monitored by the first pressure transmitter and the second pressure transmitter arranged on the transformer body oil tank, and the monitoring results are sent to the oil pressure regulating device to regulate the oil pressure in the transformer body oil tank. The first pressure transmitter and the second pressure transmitter are connected by an oil guide pipe. The first pressure transmitter is arranged at the bottom of the transformer body oil tank to monitor the maximum pressure value of the transformer body oil tank. The second pressure transmitter is arranged at the upper end of the transformer body oil tank mainly to detect the oil pressure at the position of the pressure relief valve so that the experiment cannot exceed the action value. When detecting the pressure relief valve, the function is to open and release the oil pressure when the pressure is too high, and restore the pressure relief valve when the pressure is normal.

[0052] In the embodiment of the utility model, the oil pressure regulating device 4 includes:

[0053] The oil pump 401 is used to extract the insulating oil from the oil storage tank and inject it into the transformer, and provide oil pressure;

[0054] The electronic return valve 402 is used to adjust the oil pressure and return the oil of the transformer to the oil storage tank for pressure relief;

[0055] A wireless receiver, used to receive pressure data from a wireless pressure transmitter and transmit the pressure data to a control module via an RS485 bus;

[0056] The control module automatically adjusts the oil pump and the electronic return valve according to the pressure data and controls the display output;

[0057] Display module, used for interacting with users;

[0058] Operation button, used to start and stop the oil pump;

[0059] The input end and output end of the oil pump 401 are connected to the oil inlet pipe 411 and the oil outlet pipe 412 respectively, a one-way valve 413 is arranged on the oil outlet pipe 412, the input end of the electronic return valve 402 is connected to the oil outlet pipe 412 at the output end of the one-way valve 413, and the output end of the electronic return valve 402 is connected to the oil inlet pipe 411;

[0060] The output end of the control module is connected to the oil pump 401, the input end of the operation button and the wireless receiver 403 is connected to the control module, and the output end of the control module is connected to the display module.

[0061] In the embodiment of the utility model, the oil pump is controlled to deliver oil to the transformer body oil tank. When the oil pressure in the transformer body oil tank is too high, the pressure is released through the electronic return valve. The oil pump is set with automatic control and manual control. The pressure information of the first pressure transmitter and the second pressure transmitter is received through a wireless receiver. The oil pump and the electronic return valve are automatically controlled according to the pressure information to realize the oil delivery operation to the transformer body oil tank.

[0062] At the same time, the control module displays the oil filling amount and pressure information through the display module, and can also set the pressure value and control the oil delivery through manual operation buttons.

[0063] In the embodiment of the utility model, the control module adopts the PLC controller of Mitsubishi FX3U-16MR.

[0064] The first pressure transmitter and the second pressure transmitter are Lora pressure transmitters. The wireless receiver is a Lora receiver. The Lora wireless pressure transmitter is powered by a lithium battery. The oil pressure regulating device is powered by AC220V.

[0065] The oil pump is used to extract the insulating oil from the oil storage cabinet and inject it into the transformer, and provide oil pressure. The electronic return valve is used to adjust the oil pressure. The PLC controls the opening of the electronic return valve through the I / O control valve, so that the oil of the transformer flows back to the oil storage cabinet to achieve the pressure relief effect. The Lora receiver is used to receive the data of the Lora wireless pressure transmitter and transmit the pressure data to the PLC through the RS485 bus. The RS485 module is also added to the control module, which is an expansion module of the PLC, so that the PLC can add a set of RS485 communications. The display screen uses a configuration screen for interaction with the user, such as inputting the set oil pressure and displaying the current wireless pressure sensor pressure value. The configuration screen has a data recording function, which can store the pressure data of the test process in the database for staff to view.

[0066] In the embodiment of the utility model, an exhaust valve is further arranged between the oil outlet pipe and the top valve, and the second pressure transmitter is arranged on the transformer body oil tank through an adsorption magnet; the second pressure transmitter and the pressure release valve are at the same horizontal position.

[0067] The specific operation process of the embodiment of the utility model is that the user installs the oil pressure regulating device, the first pressure transmitter and the second pressure transmitter on the transformer body oil tank, and uses the laid AC220V power supply to power the oil pressure regulating device. During the test, the fourth valve 202 and the fifth valve 204 located between the oil storage cabinet and the transformer body are closed; a gas relay 203 is also arranged between the fourth valve 202 and the fifth valve 204. After the test monitoring is completed, the fourth valve and the fifth valve are opened, the oil pressure regulating device is removed, and the oil pressure sealing test is completed.

[0068] The embodiment of the utility model realizes precise control of the transformer pressure sealing test process by adopting automatic voltage regulation and monitoring technology, and uses the insulating oil of the transformer oil storage cabinet to perform the transformer oil pressure sealing test. By introducing a programmable logic controller (PLC), fully automated and precise control of the oil pressure is realized. At the same time, with the help of a wireless pressure transmitter, the oil pressure data is obtained in real time to ensure the accurate grasp of the oil pressure change. During the test, the PLC will perform cumulative calculations based on the difference between the preset oil pressure and the measured oil pressure. As the ambient temperature increases, the volume of the insulating oil will expand. When the preset high-pressure warning value is reached, the system will automatically activate the electronic return valve to adjust the oil pressure. On the contrary, when the ambient temperature decreases and the volume of the insulating oil shrinks, the oil pump will automatically start to replenish the oil pressure until it stops working after reaching the preset value, thereby maintaining the oil pressure stable and ensuring the accuracy of the test pressure. This automatic voltage regulation mechanism not only improves the accuracy and efficiency of the test, but also significantly reduces the workload of manual monitoring.

[0069] The embodiment of the utility model realizes real-time monitoring of the oil pressure inside the transformer through a wireless pressure transmitter. The wireless pressure transmitter transmits the real-time monitored oil pressure data to the PLC, and the PLC then transmits the data to the configuration screen for display. In this way, the staff can understand the oil pressure of the transformer in real time, discover and handle abnormal situations in time, and ensure the safety and reliability of the equipment.

[0070] The utility model discloses an automatic voltage regulation and monitoring device for transformer oil pressure sealing test, which realizes accurate control of the transformer pressure sealing test process by adopting automatic voltage regulation and monitoring technology, improves the accuracy and efficiency of the test, reduces the workload of manual monitoring, and ensures the safety and reliability of the transformer.

[0071] In addition to the technical problems solved by the utility model, the technical features that constitute the technical solution, and the advantages brought by the technical features of these technical solutions described above, other technical problems that can be solved by the real-time early warning device for operation safety of hydraulic tunnels of the utility model, other technical features included in the technical solution, and the advantages brought by these technical features will be further described in detail in conjunction with the accompanying drawings.

[0072] In addition, it should be understood that although the present specification is described according to implementation modes, not every implementation mode contains only one independent technical solution. This description of the specification is only for the sake of clarity. Those skilled in the art should regard the specification as a whole. The technical solutions in each embodiment may also be appropriately combined to form other implementation modes that can be understood by those skilled in the art.

Claims

1. An automatic voltage regulation monitoring device for transformer oil pressure sealing test, characterized in that: include: The first pressure transmitter is arranged at the outer side of the bottom of the transformer body oil tank and connected to the transformer body oil tank through an oil filling valve; The second pressure transmitter is arranged at the upper end of the transformer body oil tank and connected to the transformer body oil tank; A pressure relief valve is provided at the upper end of the transformer body oil tank and is used to release the pressure of the transformer body oil tank; The oil pressure regulating device is connected to the oil conservator through the oil conservator filling valve and is connected to the top valve on the transformer body oil tank through the oil outlet pipe; The output ends of the first pressure transmitter and the second pressure transmitter are connected to the oil pressure regulating device; and an oil guide pipe is arranged between the first pressure transmitter and the second pressure transmitter.

2. The automatic voltage regulation monitoring device for transformer oil pressure sealing test according to claim 1 is characterized in that: The oil pressure regulating device comprises: Oil pump, used to extract insulating oil from the oil storage tank and inject it into the transformer, and provide oil pressure; Electronic return valve, used to adjust the oil pressure and return the transformer oil to the oil conservator for pressure relief; A wireless receiver, used to receive pressure data from a wireless pressure transmitter and transmit the pressure data to a control module via an RS485 bus; The control module automatically adjusts the oil pump and the electronic return valve according to the pressure data and controls the display output; Display module, used for interacting with users; Operation button, used to start and stop the oil pump; The input end and output end of the oil pump are connected to the oil inlet pipe and the oil outlet pipe respectively, a one-way valve is arranged on the oil outlet pipe, the input end of the electronic reflux valve is connected to the oil outlet pipe of the output end of the one-way valve, and the output end of the electronic reflux valve is connected to the oil inlet pipe; The output end of the control module is connected to the oil pump, the operation button and the input end of the wireless receiver are connected to the control module, and the output end of the control module is connected to the display module.

3. The automatic voltage regulation monitoring device for transformer oil pressure sealing test according to claim 2 is characterized in that: The control module adopts Mitsubishi's FX3U-16MR PLC controller.

4. The automatic voltage regulation monitoring device for transformer oil pressure sealing test according to claim 1 is characterized in that: The first pressure transmitter and the second pressure transmitter are Lora pressure transmitters.

5. The automatic voltage regulation monitoring device for transformer oil pressure sealing test according to claim 2 is characterized in that: The wireless receiver is a Lora receiver.

6. The automatic voltage regulation monitoring device for transformer oil pressure sealing test according to claim 1 is characterized in that: An exhaust valve is also arranged between the oil outlet pipe and the top valve.

7. The automatic voltage regulation monitoring device for transformer oil pressure sealing test according to claim 1 is characterized in that: The second pressure transmitter is arranged on the transformer body oil tank through an adsorption magnet.

8. The automatic voltage regulation monitoring device for transformer oil pressure sealing test according to claim 1 is characterized in that: The second pressure transmitter and the pressure relief valve are at the same horizontal position.

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