Automatic test device for partial discharge characteristic of mixed gas

Abstract

The invention discloses an automatic test device for the partial discharge characteristic of mixed gas, and the device comprises a test tank body which is used for storing the mixed gas; the sensor system is arranged on the test tank body and is used for detecting various signals in the test tank body; and the PLC system is electrically connected with the test tank body. According to the automatic test device for the partial discharge characteristic of the mixed gas, the integrated and automatic treatment and control of the test tank body are realized through the PLC system, so that the efficient and accurate operation of the whole device is ensured, the automatic control of the partial discharge characteristic test of the mixed gas of sulfur hexafluoride and nitrogen is realized, and the test efficiency is improved. The problems of inaccurate adjustment and control and tedious test process in the existing test are solved.

Description

Technical Field

[0001] The invention relates to the technical field of high voltage testing, and in particular to an automated testing device for partial discharge characteristics of mixed gases. Background Art

[0002] Sulfur hexafluoride (SF6) gas is widely used in high-voltage electrical equipment as the main insulating medium due to its excellent electrical insulation properties and arc extinguishing ability. However, SF6 gas is also a potentially harmful greenhouse gas with a greenhouse effect potential value as high as 23,500 times that of carbon dioxide, and its negative impact on the environment is extremely serious. In view of the serious environmental problems caused by SF6 gas, many experts and scholars have been committed to developing more environmentally friendly alternatives in recent years. Among them, nitrogen (N2) has become a hot spot for studying sulfur hexafluoride mixed gas because of its non-toxicity, harmlessness, wide source and low price.

[0003] Partial discharge is a common phenomenon that exists widely in various types of electrical equipment and may have a serious impact on the operational safety of the equipment. Research on partial discharge characteristics is crucial for the development and application of new mixed gases. It can help evaluate the reliability and performance of mixed gases as insulating media and ensure that they can meet the insulation requirements of electrical equipment. However, the study of partial discharge characteristics involves many complex factors, and there are many variables that need to be controlled during the experiment, such as gas composition, air pressure, temperature, electric field distribution, etc. This poses a great challenge to the efficiency and accuracy of the experiment. In order to improve the efficiency of the experiment and the accuracy of the data, there is an urgent need for a device that can automatically control the test conditions. Summary of the invention

[0004] In view of the problems existing in the above-mentioned existing automated test device for partial discharge characteristics of mixed gases, the present invention is proposed.

[0005] Therefore, the purpose of the present invention is to provide an automated test device for partial discharge characteristics of mixed gases, which aims to solve the problems of complicated operation and single monitoring means in the partial discharge characteristics test of sulfur hexafluoride and nitrogen mixed gases.

[0006] In order to solve the above technical problems, the present invention provides the following technical solutions: comprising:

[0007] Test tank, used to store mixed gas;

[0008] A sensor system disposed on the test tank body is used to detect various signals inside the test tank body; and

[0009] A PLC system electrically connected to the test tank.

[0010] As a preferred solution of the automated test device for partial discharge characteristics of mixed gas described in the present invention, the automated test device further comprises a data processing system electrically connected to the sensor system, for recording partial discharge data captured by the sensor system in the test tank and performing preliminary sorting.

[0011] As a preferred solution of the automated test device for partial discharge characteristics of mixed gas described in the present invention, the test tank body is made of stainless steel.

[0012] As a preferred solution of the automated test device for partial discharge characteristics of mixed gas described in the present invention, a high-voltage electrode, an insulating sleeve sleeved outside the high-voltage electrode, and a grounding electrode arranged under the test tank body are arranged at the top of the test tank body.

[0013] As a preferred solution of the automatic test device for partial discharge characteristics of mixed gas of the present invention, wherein: an air inlet valve and an air outlet valve are respectively arranged on both sides of the test tank body, and the test tank body controls the proportion and air pressure of the internal gas through the air inlet valve and the air outlet valve;

[0014] A triangular bracket is arranged at the bottom of the test tank.

[0015] As a preferred solution of the automatic test device for partial discharge characteristics of mixed gas of the present invention, a glass window is provided in the middle of the test tank body for observing the situation when partial discharge occurs inside the test tank body.

[0016] As a preferred solution of the automated test device for partial discharge characteristics of mixed gas described in the present invention, a heating rod is provided on the lower side of the test tank body for heating the inside of the test tank body.

[0017] As a preferred solution of the automatic test device for partial discharge characteristics of mixed gas of the present invention, the sensor system includes an environment monitoring module inside the test tank and a partial discharge signal acquisition module;

[0018] The environment monitoring module comprises:

[0019] Air pressure sensor, used to monitor the air pressure changes inside the test tank;

[0020] Temperature sensor, used to monitor the temperature changes inside the test tank;

[0021] Density sensor, used to monitor density changes inside the test tank;

[0022] The partial discharge signal acquisition module comprises:

[0023] Pulse current sensor, installed on the ground electrode to capture the current pulse signal generated by partial discharge;

[0024] UHF sensor, installed on the inner wall of the test tank to capture the UHF signal generated by partial discharge;

[0025] The ultrasonic sensor is installed inside the test tank to capture the ultrasonic signal generated during the discharge process.

[0026] As a preferred solution of the automatic test device for partial discharge characteristics of mixed gas of the present invention, wherein: the PLC system includes a gas pressure control module, a temperature control module, a voltage control module, and a gas ratio control module;

[0027] The air pressure control module monitors the air pressure in the test tank (100) in real time through the air pressure sensor, and controls the amount of gas in the test tank (100) according to a preset air pressure;

[0028] The temperature control module monitors the temperature inside the test tank (100) in real time through a temperature sensor, so that the temperature inside the test tank (100) is maintained at a target temperature;

[0029] The voltage control module outputs different levels of voltage by controlling the power supply to simulate partial discharge conditions under different conditions;

[0030] The gas ratio control module calculates the ratio of the mixed gas by combining the gas pressure data, the temperature data, the total density of the mixed gas, the molar mass of the SF6 gas and the molar mass of the N2 gas.

[0031] As a preferred solution of the automatic test device for partial discharge characteristics of mixed gas of the present invention, wherein: the data processing system comprises a memory and a processor;

[0032] The memory is used to record the data received by each sensor each time a partial discharge occurs;

[0033] The processor is used to perform preliminary processing on the data recorded in the memory to output a csv file and a partial discharge spectrum file.

[0034] The beneficial effects of the present invention are as follows: the automatic control of key test conditions is realized through the PLC system, and a variety of typical partial discharge defects can be simulated by replacing electrodes, thereby improving the efficiency of the test. BRIEF DESCRIPTION OF THE DRAWINGS

[0035] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the following briefly introduces the drawings required for describing the embodiments. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work. Among them:

[0036] Figure 1 The figure is a schematic diagram of the overall structure of the automated test device for partial discharge characteristics of mixed gases of the present invention. DETAILED DESCRIPTION

[0037] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and easy to understand, the specific implementation methods of the present invention are described in detail below in conjunction with the accompanying drawings.

[0038] In the following description, many specific details are set forth to facilitate a full understanding of the present invention, but the present invention may also be implemented in other ways different from those described herein, and those skilled in the art may make similar generalizations without violating the connotation of the present invention. Therefore, the present invention is not limited to the specific embodiments disclosed below.

[0039] Secondly, the term "one embodiment" or "embodiment" as used herein refers to a specific feature, structure, or characteristic that may be included in at least one implementation of the present invention. The term "in one embodiment" that appears in different places in this specification does not necessarily refer to the same embodiment, nor does it refer to a separate or selective embodiment that is mutually exclusive with other embodiments.

[0040] Secondly, the present invention is described in detail with reference to the schematic diagram. When describing the embodiments of the present invention in detail, for the sake of convenience, the cross-sectional diagrams showing the device structure will not be partially enlarged according to the general scale, and the schematic diagrams are only examples, which should not limit the scope of protection of the present invention. In addition, in actual production, the three-dimensional dimensions of length, width and depth should be included.

[0041] Example 1

[0042] Reference Figure 1 , which is the first embodiment of the present invention, provides an automated test device for partial discharge characteristics of a mixed gas, the device comprising:

[0043] The test tank 100 is used to store the mixed gas;

[0044] The sensor system 300 disposed on the test tank 100 is used to detect various signals inside the test tank 100; and

[0045] A PLC system electrically connected to the test tank 100.

[0046] The automated test device further comprises a data processing system electrically connected to the sensor system 300 , which is used to record the partial discharge data captured by the sensor system 300 in the test tank 100 and perform preliminary sorting.

[0047] The test tank 100 is made of stainless steel.

[0048] A high-voltage electrode 201 and an insulating sleeve 202 are provided at the top of the test tank body 100 to enhance the insulation performance of the high-voltage end, thereby improving the safety and stability of the equipment, and a grounding electrode 203 is provided under the test tank body 100. The high-voltage end of the power supply is connected to the test tank body 100 through the high-voltage electrode 201. The PLC control system is responsible for adjusting the output voltage of the power supply, thereby accurately controlling the voltage level in the test tank body 100 and ensuring the accuracy and controllability of the test conditions.

[0049] An air inlet valve 101 and an air outlet valve 102 are respectively provided on both sides of the test tank body 100, and the test tank body 100 controls the proportion and pressure of the internal gas through the air inlet valve 101 and the air outlet valve 102;

[0050] An inlet valve 101 and an outlet valve 102 are installed on both sides of the test tank 100 to adjust the gas flow in the test tank 100 during the test. The switch status of the inlet valve 101 and the outlet valve 102 is automatically controlled by the PLC system, which can achieve accurate gas flow management according to the test requirements, thereby better simulating actual operating conditions and reducing human intervention, improving test efficiency and accuracy.

[0051] A triangular bracket 103 is disposed at the bottom of the test tank 100 .

[0052] A glass window 500 is provided in the middle of the test tank 100 for observing the situation when partial discharge occurs inside the test tank 100;

[0053] The glass window 500 is made of high-strength pressure-resistant glass. Under the premise of ensuring safety, it allows the operator to visually observe the internal conditions of the test tank 100 during the test, especially the arc discharge phenomenon and its position when partial discharge occurs, which is helpful for real-time monitoring of test progress and fault diagnosis.

[0054] A heating rod 400 is provided on the lower side of the test tank body 100 for heating the inside of the test tank body 100;

[0055] The heating rod 400 can achieve precise heating of the inside of the test tank 100. The temperature and heating time are automatically controlled by an external PLC system to ensure the stability and consistency of the test temperature. This design can be used to simulate test conditions under different temperature environments to meet various experimental requirements.

[0056] The sensor system 300 includes an environment monitoring module inside the test tank 100 and a partial discharge signal acquisition module;

[0057] The environment monitoring module comprises:

[0058] An air pressure sensor, used to monitor the air pressure changes inside the test tank 100;

[0059] A temperature sensor, used to monitor the temperature change inside the test tank 100;

[0060] A density sensor, used to monitor density changes inside the test tank 100;

[0061] The partial discharge signal acquisition module comprises:

[0062] A pulse current sensor is installed on the ground electrode 203 to capture the current pulse signal generated by partial discharge;

[0063] A UHF sensor is installed on the inner wall of the test tank 100 to capture the UHF signal generated by the partial discharge;

[0064] The ultrasonic sensor is installed inside the test tank 100 to capture the ultrasonic signal generated during the discharge process.

[0065] The PLC system includes a gas pressure control module, a temperature control module, a voltage control module, and a gas ratio control module;

[0066] The air pressure control module monitors the air pressure in the test tank 100 in real time through the air pressure sensor, and controls the amount of gas in the test tank 100 according to the preset air pressure;

[0067] The temperature control module monitors the temperature inside the test tank 100 in real time through the temperature sensor, so that the temperature inside the test tank 100 is maintained at the target temperature;

[0068] The voltage control module outputs different levels of voltage by controlling the power supply to simulate partial discharge conditions under different conditions;

[0069] The gas ratio control module calculates the ratio of the mixed gas by combining the gas pressure data, the temperature data, the total density of the mixed gas, the molar mass of the SF6 gas and the molar mass of the N2 gas.

[0070] The calculation is done by combining the following equations:

[0071] PV=n 总 RT;

[0072] m 总=ρ 总 V;

[0073] m 总 =n SF6 ·M SF6 +n N2 ·M N2 ;

[0074] n 总 =n SF6 +n N2 ;

[0075] Calculate the ratio of the mixed gas:

[0076]

[0077] Where P is pressure, V is volume, and n is g is the number of moles of gas, R is the ideal gas constant, and T is the temperature;

[0078] m g is the mass of the gas, ρ g is the density of the gas;

[0079] n SF6 and n N2 are the mole numbers of SF6 and N2, M SF6 and M N2 are the molar masses of SF6 and N2 respectively.

[0080] In summary, the PLC system realizes the automatic control of key test conditions, and by replacing electrodes, it can simulate a variety of typical partial discharge defects, thus improving the efficiency of the test.

[0081] Importantly, it should be noted that the construction and arrangement of the present application shown in a plurality of different exemplary embodiments are only exemplary. Although only a few embodiments are described in detail in this disclosure, it should be readily understood by those who refer to this disclosure that many modifications are possible (e.g., the size, scale, structure, shape and proportion of various elements, and parameter values ​​(e.g., temperature, pressure, etc.), installation arrangement, use of materials, color, directional changes, etc.) without substantially departing from the novel teachings and advantages of the subject matter described in the application. For example, the element shown as integrally formed can be composed of multiple parts or elements, the position of the element can be inverted or otherwise changed, and the nature or number or position of the discrete element can be changed or changed. Therefore, all such modifications are intended to be included in the scope of the present invention. The order or sequence of any process or method steps can be changed or reordered according to alternative embodiments. In the claims, any "device plus function" clause is intended to cover the structure of performing the function described herein, and is not only structurally equivalent but also equivalent structure. Without departing from the scope of the present invention, other replacements, modifications, changes and omissions can be made in the design, operating conditions and arrangement of the exemplary embodiments. Therefore, the invention is not limited to a specific embodiment, but extends to numerous modifications still falling within the scope of the appended claims.

[0082] Additionally, in order to provide a concise description of exemplary embodiments, all features of an actual embodiment (ie, those features that are not relevant to the best mode presently contemplated for carrying out the invention or those that are not relevant to implementing the invention) may not be described.

[0083] It should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention rather than to limit it. Although the present invention has been described in detail with reference to the preferred embodiments, those skilled in the art should understand that the technical solutions of the present invention may be modified or replaced by equivalents without departing from the spirit and scope of the technical solutions of the present invention, which should all be included in the scope of the claims of the present invention.

Claims

1. An automated test device for partial discharge characteristics of mixed gases, characterized in that: include, A test tank (100) is used to store the mixed gas; A sensor system (300) disposed on the test tank (100) for detecting various signals inside the test tank (100); and A PLC system electrically connected to the test tank (100).

2. The automated test device for partial discharge characteristics of mixed gas according to claim 1, characterized in that: The automated test device further comprises a data processing system electrically connected to the sensor system (300), which is used to record the partial discharge data captured by the sensor system (300) in the test tank (100) and to perform preliminary sorting.

3. The automatic test device for partial discharge characteristics of mixed gas according to claim 2, characterized in that: The test tank body (100) is made of stainless steel.

4. The automatic test device for partial discharge characteristics of mixed gas according to claim 3, characterized in that: A high-voltage electrode (201), an insulating sleeve (202) sleeved outside the high-voltage electrode (201), and a grounding electrode (203) arranged below the test tank (100) are arranged at the top of the test tank (100).

5. The automatic test device for partial discharge characteristics of mixed gas according to claim 4, characterized in that: An air inlet valve (101) and an air outlet valve (102) are respectively arranged on both sides of the test tank body (100), and the test tank body (100) controls the proportion and pressure of the internal gas through the air inlet valve (101) and the air outlet valve (102); A triangular bracket (103) is provided at the bottom of the test tank (100).

6. The automatic test device for partial discharge characteristics of mixed gas according to claim 5, characterized in that: A glass window (500) is provided in the middle of the test tank (100) for observing the situation when partial discharge occurs inside the test tank (100).

7. The automatic test device for partial discharge characteristics of mixed gas according to claim 6, characterized in that: A heating rod (400) is provided on the lower side of the test tank (100) for heating the interior of the test tank (100).

8. The automatic test device for partial discharge characteristics of mixed gas according to claim 7, characterized in that: The sensor system (300) comprises an environment monitoring module inside the test tank (100) and a partial discharge signal acquisition module; The environment monitoring module comprises: An air pressure sensor, used to monitor changes in air pressure inside the test tank (100); A temperature sensor, used to monitor temperature changes inside the test tank (100); A density sensor, used to monitor density changes inside the test tank (100); The partial discharge signal acquisition module comprises: A pulse current sensor is installed on the ground electrode (203) to capture a current pulse signal generated by partial discharge; A UHF sensor is installed on the inner wall of the test tank (100) to capture the UHF signal generated by partial discharge; The ultrasonic sensor is installed inside the test tank (100) to capture the ultrasonic signal generated during the discharge process.

9. The automatic test device for partial discharge characteristics of mixed gas according to claim 8, characterized in that: The PLC system includes a gas pressure control module, a temperature control module, a voltage control module, and a gas ratio control module; The air pressure control module monitors the air pressure in the test tank (100) in real time through the air pressure sensor, and controls the amount of gas in the test tank (100) according to a preset air pressure; The temperature control module monitors the temperature inside the test tank (100) in real time through a temperature sensor, so that the temperature inside the test tank (100) is maintained at a target temperature; The voltage control module outputs different levels of voltage by controlling the power supply to simulate partial discharge conditions under different conditions; The gas ratio control module calculates the ratio of the mixed gas by combining the gas pressure data, the temperature data, the total density of the mixed gas, the molar mass of the SF6 gas and the molar mass of the N2 gas.

10. The automatic test device for partial discharge characteristics of mixed gas according to claim 9, characterized in that: The data processing system includes a memory and a processor; The memory is used to record the data received by each sensor each time a partial discharge occurs; The processor is used to perform preliminary processing on the data recorded in the memory to output a csv file and a partial discharge spectrum file.

Images