A low-temperature pressure on-line monitoring test device and test method

Abstract

The application relates to a low-temperature pressure online monitoring test device and a test method, which comprises a test tank body, a pressure online monitoring device, a liquid pressure gauge, a gas pipeline, a gas pressure gauge, a gas pressure charging device and a high-low temperature test box; wherein the test tank body is filled with preset volume of insulating oil; the test tank body is placed in the high-low temperature test box; the pressure online monitoring device and the liquid pressure gauge are connected to a sampling port of the test tank body; the gas pressure charging device is connected with the test tank body through the gas pipeline, and the gas pressure gauge is connected to the gas pipeline; a first valve is arranged between the gas pressure charging device and the gas pipeline, and a second valve is arranged between the test tank body and the gas pipeline. The low-temperature pressure online monitoring test device can adjust the gas pressure and the test temperature in the test tank body, so that the low-temperature test capacity of the pressure online monitoring device under different gas pressures and different temperatures is achieved.

Description

Technical Field

[0001] This invention relates to the field of power equipment testing technology, and more specifically, to a test device and method for online pressure monitoring at low temperatures. Background Technology

[0002] With the development of the power Internet of Things (IoT), a large number of online pressure monitoring devices are being used to collect real-time and dynamic information from electrical equipment, enabling rapid, multi-dimensional, and multi-scale real-time monitoring, sensing the status of electrical equipment and the power grid, and providing a large amount of sensor data for analyzing equipment operating status and making scientific decisions for the power grid.

[0003] However, high-altitude and cold regions place high demands on the temperature tolerance of online pressure monitoring devices, especially the durability of sensors and the accuracy of measurement data under low-temperature conditions, which directly affect the long-term stable operation of power transmission and transformation equipment. To improve the reliability and stability of online pressure monitoring devices in low-temperature environments, low-temperature research on these devices is crucial. Therefore, specialized testing equipment for online pressure monitoring is needed to study their low-temperature characteristics. Currently, the power industry lacks corresponding testing equipment for low-temperature online pressure monitoring devices, resulting in a lack of experimental research on their low-temperature performance, which hinders the application and promotion of online pressure monitoring devices in high-altitude and cold regions. Summary of the Invention

[0004] In view of this, the purpose of the present invention is to provide a test device and test method for online pressure monitoring at low temperature, which aims to solve the problems existing in the prior art.

[0005] According to a first aspect of the present invention, a low-temperature pressure online monitoring test apparatus is provided, comprising: a test tank, an online pressure monitoring device, a liquid pressure gauge, a gas pipeline, a gas pressure gauge, a gas pressurization device, and a high and low temperature test chamber; wherein,

[0006] The test tank contains a predetermined volume of insulating oil;

[0007] The test tank is placed in the high and low temperature test chamber, which provides a low temperature test environment for the test tank.

[0008] The pressure online monitoring device and the liquid pressure gauge are both connected to the sampling port of the test tank. The liquid pressure gauge is used to measure the liquid pressure in the test tank, and the pressure online monitoring device is used to monitor the liquid pressure in the test tank and to issue an alarm when the liquid pressure reaches a preset value.

[0009] The gas charging device is connected with the test tank through the gas pipeline, and is used for charging gas into the test tank; and the gas pressure gauge is connected with the gas pipeline, and is used for measuring the gas pressure in the test tank.

[0010] The first valve is arranged between the gas charging device and the gas pipeline, and the second valve is arranged between the test tank and the gas pipeline, the first valve is used for controlling the on-off between the gas charging device and the gas pipeline, and the second valve is used for controlling the on-off between the gas pipeline and the test tank.

[0011] Preferably, the gas charging device is a compressed air cylinder.

[0012] Preferably, the pressure on-line monitoring device comprises a pressure sensor and a pressure alarm device, the pressure sensor is connected with the sampling port of the test tank, and the pressure sensor is electrically connected with the pressure alarm device.

[0013] Preferably, the pressure alarm device is arranged outside the high-low temperature test box, and the pressure sensor is connected with the pressure alarm device through a wire.

[0014] Preferably, a threading hole is arranged on one of the side walls of the high-low temperature test box, and the gas pipeline and the wire pass through the threading hole.

[0015] Preferably, the threading hole is filled with thermal insulation cotton.

[0016] Preferably, a high-low temperature test area is arranged in the middle of the high-low temperature test box, and the test tank is arranged in the high-low temperature test area.

[0017] Preferably, an observation window is arranged on at least one of the side walls of the high-low temperature test box, a transparent observation panel is arranged on the observation window, and the observation window is arranged corresponding to the high-low temperature test area.

[0018] Preferably, the test tank comprises a cylinder body and a top cover, the cylinder body is a cylindrical structure with an open top, and the top cover is connected with the open top of the cylinder body through bolts.

[0019] A sampling port is arranged at the lower part of the side wall of the cylinder body, a tee joint is connected with the sampling port, and the pressure on-line monitoring device and the liquid pressure gauge are connected with the tee joint.

[0020] An air inlet pipe is arranged on the top cover, and the gas pipeline is connected with the air inlet pipe through the second valve.

[0021] A sealing ring is arranged between the top cover and the cylinder body.

[0022] According to the second aspect of the present application, a low-temperature pressure online monitoring test method is provided, which is implemented by using the low-temperature pressure online monitoring test device as described above, and comprises the following steps:

[0023] Step one, install and arrange the low-temperature pressure online monitoring test device;

[0024] Step two, set the temperature of the high-low temperature test box to a specified low temperature, and keep for two hours after the temperature is constant;

[0025] Step three, slowly charge the test tank body by the gas charging device, and observe the readings of the gas pressure gauge and the liquid pressure gauge in real time until the pressure online monitoring device triggers an alarm, and then stop charging immediately, record the readings of the gas pressure gauge and the liquid pressure gauge when the alarm is triggered, and complete the test.

[0026] The low-temperature pressure online monitoring test device and test method provided by the present application can simulate the electrical equipment to be tested by filling the test tank body with a pre-set volume of insulating oil, connect the pressure online monitoring device to the oil outlet of the test tank body, place the test tank body in the high-low temperature test box, and connect the test tank body to the gas charging device through the gas pipeline, so as to adjust the gas pressure in the test tank body and the test temperature of the test tank body, realize the low-temperature performance test of the pressure online monitoring device, and make the test device have the low-temperature test capability of the pressure online monitoring device under different gas pressures and different temperatures. BRIEF DESCRIPTION OF DRAWINGS

[0027] The above and other objects, features and advantages of the present application will become more apparent from the following description of embodiments of the present application with reference to the accompanying drawings.

[0028] Figure 1 A structure schematic diagram of a low-temperature pressure online monitoring test device according to an embodiment of the present application is shown.

[0029] Figure 2 A structure schematic diagram of a test tank body in a low-temperature pressure online monitoring test device according to an embodiment of the present application is shown.

[0030] Figure 3 A structure schematic diagram of a through hole on the side wall of a high-low temperature test box in a low-temperature pressure online monitoring test device according to an embodiment of the present application is shown.

[0031] In the figure: test tank 1, cylinder 11, top cover 12, gas inlet pipe 13, three-way pipe 14, bottom support 15, pressure online monitoring device 2, wire 21, liquid pressure gauge 3, gas pipeline 4, gas pressure gauge 5, gas pressure device 6, first valve 7, second valve 8, high-low temperature test box 9, wire hole 92, thermal insulation cotton 93. DETAILED DESCRIPTION

[0032] Various embodiments of the present application will be described in greater detail below with reference to the accompanying drawings. In the various drawings, the same elements are denoted by the same or similar reference numerals. For the sake of clarity, various parts in the drawings are not drawn to scale.

[0033] The present application provides a low-temperature pressure online monitoring test device, referring to Figure 1 The low-temperature pressure online monitoring test device includes: a test tank 1, a pressure online monitoring device 2, a liquid pressure gauge 3, a gas pipeline 4, a gas pressure gauge 5, a gas pressure device, and a high-low temperature test box 9. The test tank 1 contains a predetermined volume of insulating oil; the test tank 1 is placed in the high-low temperature test box 9, which provides a low-temperature test environment for the test tank 1; the pressure online monitoring device 2 and the liquid pressure gauge 3 are both connected to the sampling port of the test tank 1; the gas pressure device is connected to the test tank 1 through the gas pipeline 4, and the gas pressure gauge 5 is connected to the gas pipeline 4; the first valve 7 is provided between the gas pressure device and the gas pipeline 4, and the second valve 8 is provided between the test tank 1 and the gas pipeline 4.

[0034] Specifically, the test tank 1 contains an appropriate volume of 45# insulating oil to simulate the electrical equipment tested by the actual pressure online monitoring device 2. The pressure online monitoring device 2 includes a pressure sensor and a pressure alarm device, the pressure sensor is connected to the sampling port of the test tank 1, and the pressure sensor is electrically connected to the pressure alarm device.

[0035] The high-low temperature test chamber is an experimental equipment widely used in industrial, scientific research and production fields, which is used for simulating the performance test of materials, devices and other articles under various temperature environments. The structure of the high-low temperature test chamber mainly consists of a chamber body, a heating / cooling system, a temperature control system, a sensor and the like. Among them, the chamber body is the main part of the test chamber, which is generally made of stainless steel and has certain heat insulation performance and sealing performance to ensure the independence of the temperature inside and outside the test chamber; the heating / cooling system is the key to realize the temperature change, which mainly includes electric heater, compressor, heat exchanger and other equipment, which circulates the air in the chamber through the air circulator to heat or cool; the temperature control system is responsible for monitoring the temperature in the test chamber in real time, and controls the work of the heating / cooling system, so that the temperature in the test chamber is stable within the set value range; the sensor is used to detect the temperature and humidity and other parameters in the chamber in real time, and feed back the data to the temperature control system for processing. The working principle of the high-low temperature test chamber is based on the principle of thermodynamics, which mainly includes heating and cooling processes. The heating system raises the temperature in the chamber through electric heater, air circulator and other equipment, and the cooling system lowers the temperature in the chamber through compressor, heat exchanger and other equipment. The temperature control system of the high-low temperature test chamber is responsible for controlling the work of the heating and cooling system, ensuring that the temperature in the test chamber fluctuates within the set range. The temperature control range of the high-low temperature test chamber 9 in this embodiment is -50℃-70℃, and the test tank body 1 is placed in the high-low temperature test chamber 9. The high-low temperature test chamber 9 in this embodiment can simulate the low temperature working condition from -50℃ to 0℃.

[0036] The middle part of the high-low temperature test chamber 9 is provided with a high-low temperature chamber temperature control test area 91, and the test tank body 1 is arranged in the high-low temperature chamber temperature control test area 91. In this embodiment, at least one side wall of the high-low temperature test chamber 9 is provided with an observation window, and a transparent observation panel is arranged on the observation window. The observation window is arranged corresponding to the high-low temperature chamber temperature control test area 91, so as to observe the reading of the hydraulic pressure gauge and the state of the test tank body 1 through the observation window. In specific implementation, the observation panel can be a transparent glass plate or a plastic plate.

[0037] Further, the pressure alarm device of the pressure online monitoring device 2 is arranged outside the high-low temperature test chamber 9, the pressure sensor of the pressure online monitoring device 2 is connected with the pressure alarm device through the wire 21, and the pressure alarm device is powered by a separate power supply. In order to facilitate the connection of the gas pipeline 4 and the wire 21 of the pressure online monitoring device 2 with the test tank body 1 in the high-low temperature test chamber 9, a threading hole 92 is formed in one side wall of the high-low temperature test chamber 9, and the gas pipeline 4 and the wire 21 pass through the threading hole 92. The threading hole 92 is filled with thermal insulation cotton 93 to ensure that the high-low temperature test chamber 9 is well sealed and has good temperature control performance. Referring to Figure 3In the embodiment, the heat preservation cotton 93 is made into a cylindrical structure matching the threading hole 92, and a through hole is formed on the heat preservation cotton 93 for the gas pipeline 4 and the wire 21 to pass through, the gas pipeline 4 and the wire 21 pass through the heat preservation cotton 93, and the heat preservation cotton 93 can be fixedly connected at the threading hole 92. In the embodiment, the pressure alarm device of the pressure online monitoring device 2 is provided with two wires 21, one of which is a black signal wire connected to the pressure sensor, and the other is a red ground wire connected to the test tank body 1.

[0038] Referring to Figure 2 In the embodiment, the test tank body 1 includes a cylinder 11 and a top cover 12. The cylinder 11 is a cylindrical structure with an open top, and a connecting flange plate is arranged on the open top of the cylinder 11. The top cover 12 is a circular plate structure, and is connected to the open top of the cylinder 11 by a plurality of bolts. A sampling port is arranged on the lower part of the side wall of the cylinder 11, and a tee pipe 14 is connected to the sampling port. The liquid pressure gauge 3 and the pressure sensor of the pressure online monitoring device 2 are both connected to the tee pipe 14. An air inlet pipe 13 is arranged on the top cover 12, and the gas pipeline 4 is connected to the air inlet pipe 13 through the second valve 8. A sealing ring is arranged between the top cover 12 and the cylinder 11 to ensure that the test tank body 1 has good sealing performance after the top cover 12 is connected to the cylinder 11, so that compressed air can be filled into the test tank body 1 through the gas pipeline 4 to adjust the pressure in the test tank body 1. A bottom support 15 is further arranged on the bottom of the cylinder 11, which can be made of square tube or angle steel. The bottom support 15 separates the bottom of the cylinder 11 from the bottom of the high-low temperature test box 9 by a certain distance to ensure that the test tank body 1 has a stable test temperature.

[0039] In the embodiment, the gas pressure charging device is a compressed air cylinder 6, and the first valve 7 and the second valve 8 are both manual ball valves. One end of the first valve 7 is connected to the air outlet of the compressed air cylinder 6, and the other end of the first valve 7 is connected to the gas pipeline 4. One end of the second valve 8 is connected to the air inlet pipe 13 of the test tank body 1, and the other end of the second valve 8 is connected to the gas pipeline 4.

[0040] In the low-temperature pressure online monitoring test device, the compressed air cylinder 6 is used to charge air into the test tank body 1 to maintain a fixed pressure in the test tank body 1. The first valve 7 is used to control the connection between the compressed air cylinder 6 and the gas pipeline 4. The gas pressure gauge 5 is used to measure the relative pressure of the gas pipeline 4 between the compressed air cylinder and the test tank body 1. The second valve 8 is used to control the connection between the test tank body 1 and the gas pipeline 4 to control the pressure in the test tank body 1. The pressure online monitoring device 2 and the liquid pressure gauge 3 are both connected to the sampling port, and the liquid pressure gauge 3 is used to measure the relative pressure of the sampling port connected to the pressure online monitoring device 2.

[0041] The application also provides a low-temperature pressure online monitoring test method, which is implemented by using the low-temperature pressure online monitoring test device.

[0042] Step one, install and arrange the low-temperature pressure online monitoring test device.

[0043] In this step, after the installation and arrangement of the low-temperature pressure online monitoring test device are completed, check the valves to ensure that the first valve and the second valve are in the closed state.

[0044] Step two, set the temperature of the high-low temperature test box to a specified low temperature, and keep it constant for two hours after the temperature is constant.

[0045] Specifically, the specified low temperature is the low temperature required by the pressure online monitoring device during testing. In this embodiment, it is required to test whether the pressure online monitoring test device can work normally at-40℃ low temperature environment, so the temperature of the high-low temperature test box is set to-40℃ during testing, and the temperature of the high-low temperature test box is kept constant at-40℃ for two hours.

[0046] Step three, slowly charge and pressurize the test tank body through the gas charging device, and observe the readings of the gas pressure gauge and the liquid pressure gauge in real time until the pressure online monitoring device triggers an alarm, and then stop pressurizing immediately, and record the readings of the gas pressure gauge and the liquid pressure gauge when the alarm is triggered.

[0047] Specifically, in this embodiment, the first valve and the second valve are opened, and the test tank body is slowly charged and pressurized through the air compression steel cylinder. The charging and pressurizing speed of the test tank body can be controlled by controlling the opening and closing degree of the first valve and the second valve. In this embodiment, the readings of the gas pressure gauge and the liquid pressure gauge are observed in real time during the slow charging and pressurizing process of the test tank body. When the pressure online monitoring device triggers an alarm, the gas pressure gauge reading at the alarm triggering time is recorded as 0.099 MPa, and the liquid pressure gauge reading is 0.1010 MPa. The test surface of the pressure online monitoring test device can work normally at-40℃, and the alarm triggering is completed.

[0048] In conclusion, the low-temperature pressure on-line monitoring test device and test method provided by the application can simulate the electrical equipment to be tested by filling the test tank with insulating oil of a preset volume, the pressure on-line monitoring device is connected to the oil outlet of the test tank, the test tank is placed in the high-low temperature test box, and the test tank is connected to the gas pressure charging device through the gas pipeline, so that the gas pressure in the test tank and the test temperature of the test tank can be adjusted, the low-temperature performance test of the pressure on-line monitoring device is realized, and the test device has the low-temperature test capability of the pressure on-line monitoring device under different gas pressures and different temperatures. The application fills the blank of the low-temperature pressure on-line monitoring test device, so as to facilitate the low-temperature performance test of the low-temperature pressure on-line monitoring device; the device has simple structure, low manufacturing cost and good practicability.

[0049] It should be noted that, in this document, the terms such as first and second are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between such entities or operations. Moreover, the terms "comprises", "comprising", or any other variations thereof are intended to cover non-exclusive inclusions, so that a process, method, article, or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or other elements inherent to such a process, method, article, or device. Without more limitations, the element defined by the statement "comprises a" does not exclude the presence of additional identical elements in the process, method, article, or device including the element.

[0050] Finally, it should be noted that: obviously, the above embodiments are only examples for clearly illustrating the application, and are not limitations on the embodiments. Based on the above description, other different forms of changes or variations can be made by those of ordinary skill in the art. Here, it is not necessary or possible to exhaust all the embodiments. The obvious changes or variations derived therefrom are still within the protection scope of the application.

Claims

1. A test device for online pressure monitoring at low temperatures, characterized in that, include: The test tank, online pressure monitoring device, liquid pressure gauge, gas pipeline, gas pressure gauge, gas pressurization device, and high and low temperature test chamber; among which, The test tank contains a predetermined volume of insulating oil; The test tank is placed in the high and low temperature test chamber, which provides a low temperature test environment for the test tank. The pressure online monitoring device and the liquid pressure gauge are both connected to the sampling port of the test tank. The liquid pressure gauge is used to measure the liquid pressure in the test tank, and the pressure online monitoring device is used to monitor the liquid pressure in the test tank and to issue an alarm when the liquid pressure reaches a preset value. The gas pressurization device is connected to the test tank through the gas pipeline and is used to pressurize the test tank with gas. The gas pressure gauge is connected to the gas pipeline and is used to measure the gas pressure in the test tank. A first valve is provided between the gas pressurization device and the gas pipeline, and a second valve is provided between the test tank and the gas pipeline. The first valve is used to control the connection and disconnection between the gas pressurization device and the gas pipeline, and the second valve is used to control the connection and disconnection between the gas pipeline and the test tank. The gas pressurization device is a compressed air cylinder; The pressure online monitoring device includes a pressure sensor and a pressure alarm device. The pressure sensor is connected to the sampling port of the test tank, and the pressure sensor is electrically connected to the pressure alarm device.

2. The online pressure monitoring test device at low temperature according to claim 1, characterized in that, The pressure alarm device is located outside the high and low temperature test chamber, and the pressure sensor is connected to the pressure alarm device via a wire.

3. The online pressure monitoring test device at low temperature according to claim 2, characterized in that, A wire hole is provided on one side wall of the high and low temperature test chamber, through which the gas pipeline and wire pass.

4. The online pressure monitoring test device at low temperature according to claim 3, characterized in that, The threading hole is filled with insulating cotton.

5. The online pressure monitoring test device at low temperature according to claim 1, characterized in that, The high and low temperature test chamber has a temperature control test area in the middle, and the test tank is set in the temperature control test area.

6. The online pressure monitoring test device at low temperature according to claim 5, characterized in that, The high and low temperature test chamber has an observation window on at least one side wall, and the observation window has a transparent observation panel. The observation window is set in correspondence with the temperature control test area of ​​the high and low temperature test chamber.

7. The online pressure monitoring test device at low temperature according to claim 1, characterized in that, The test tank includes a cylindrical body and a top cover. The cylindrical body is a cylindrical structure with an open top, and the top cover is bolted to the top opening of the cylindrical body. A sampling port is provided at the lower part of the side wall of the cylinder, and a three-way pipe is connected to the sampling port. The online pressure monitoring device and the liquid pressure gauge are both connected to the three-way pipe. The top cover is provided with an air inlet pipe, and the gas pipeline is connected to the air inlet pipe through the second valve; A sealing ring is provided between the top cover and the cylinder.

8. A method for online pressure monitoring at low temperatures, characterized in that, The test is carried out using the online pressure monitoring device at low temperature as described in any one of claims 1-7, and includes the following steps: Step 1: Install and set up the online pressure monitoring test device at low temperature; Step 2: Set the temperature of the high and low temperature test chamber to the specified low temperature, and maintain the temperature for two hours after it becomes constant; Step 3: Slowly pressurize the test tank with gas using the gas pressurization device, and observe the readings of the gas pressure gauge and liquid pressure gauge in real time until the pressure online monitoring device triggers an alarm. Immediately stop pressurizing, record the readings of the gas pressure gauge and liquid pressure gauge when the alarm is triggered, and the test is completed.

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