Electric reactor fault equivalent experiment device based on transformer typical catastrophe simulation assembly

Abstract

The invention discloses an electric reactor fault equivalent experiment device based on a transformer typical catastrophe simulation assembly, which belongs to the field of transformer fault diagnosis and prediction and is composed of a power supply unit, a model unit, a measurement unit and a simulation experiment platform for a transformer. When the experiment device simulates actual transformer part faults, including local overheating faults, local discharge faults and metal particle discharge faults, the structure of the simulation experiment platform is optimized, so that the problem that the simulation experiment platform is difficult to accurately simulate the faults is solved, and the simulation precision in a specific fault scene is improved. According to the invention, a more reliable means is provided for accurate evaluation of transformer faults, so that effective support is provided for safe and stable operation of a power system.

Description

Technical Field

[0001] The invention relates to the field of transformer fault diagnosis and prediction, and in particular to a reactor fault equivalent experimental device based on a typical disaster simulation component of a transformer. Background Art

[0002] With the rapid development of the electric power industry, as one of the important equipment in the power transmission and transformation system, the single capacity and voltage level of power transformers are also growing. However, while the power transformer manufacturing industry is developing rapidly and in line with international standards and the transformer capacity is getting larger and larger, transformer failures also occur from time to time, mainly in the form of short-circuit instability, local overheating and insulation breakdown. How to better solve these key scientific problems has become a research hotspot of great concern to scholars and engineering technicians at home and abroad. Due to the manufacturing process, impact during operation, equipment aging and other reasons, there may be some latent faults inside the transformer. Because the core components of the oil-immersed transformer are immersed in insulating oil for operation, any faults in these components can be reflected by the changes in the insulating oil. In particular, the changes in dissolved gas in the oil are more obvious and direct. At the same time, the destructive effect of local discharge in different parts on the insulation of the transformer is different. Therefore, accurately locating the location of partial discharge, accurately measuring the amount of partial discharge, and then evaluating the degree of damage to insulation are of great significance to ensuring the normal operation of power equipment and optimizing product design.

[0003] In this regard, some scholars have proposed a method of constructing a simulation experiment platform, and applying various excitations to the constructed simulation experiment platform to simulate various working conditions and fault conditions of actual transformers. In the current background technology, there are some patents and documents related to the research on the construction of transformer simulation experiment platforms. The closest prior art documents may contain content about the structural optimization method of transformer simulation experiment platforms, but there are still some urgent problems to be solved in the simulation of actual transformer faults. First, there is a lack of effective means to solve the different fault forms caused by the difference in structure between the simulation experiment platform and the actual transformer.

[0004] The difficulty in solving these problems mainly stems from the difference between the simulation experimental platform and the actual transformer structure, which makes it difficult to accurately simulate the fault during simulation. Therefore, it is necessary to propose a new and more effective method to solve these problems and difficulties in transformer fault simulation. Summary of the invention

[0005] To this end, the technical problem to be solved by the present invention is to overcome the control and measurement of temperature in overheating fault tests, discharge amount in discharge fault tests in the prior art, and the control of flow rate, temperature, discharge amount, and electrode form required for typical disaster simulation components of transformers.

[0006] In order to solve the above technical problems, the present application provides a reactor fault equivalent experimental device based on a typical transformer disaster simulation component, including:

[0007] A power supply unit, used for providing a test voltage to the high voltage electrode;

[0008] The reactor fault simulation model unit includes a needle electrode, a plate electrode and an insulating screw, wherein the needle electrode is a grounding electrode; the plate electrode is a high-voltage electrode; one end of the insulating screw is fixedly connected to the grounding electrode to control the electrode distance;

[0009] Measuring unit for measuring the discharge of electrodes under static conditions.

[0010] Preferably, the flat plate electrode and the grounded globe electrode form a ball-plate electrode, which together with the main oil channel, oil pump, temperature control unit and flow rate control unit form a transformer simulation experimental platform for simulating local faults occurring during transformer operation.

[0011] Preferably, the temperature control unit is composed of a temperature sensor, a heating wire and an intelligent digital display temperature controller, which is used to monitor and adjust the transformer oil temperature in the device in real time.

[0012] Preferably, the flow rate control unit is composed of an oil pump, which can drive the transformer oil to circulate in the system at a specific flow rate in the simulation experimental platform. The flow rate control system changes the oil pump speed through a frequency converter, thereby realizing continuous adjustment of the oil flow rate.

[0013] Preferably, the measuring unit comprises a pulse current sensor, an input adapter and a digital partial discharge comprehensive analyzer connected in sequence;

[0014] The pulse current sensor is connected to the ground electrode, wherein the input adapter is used to convert the alternating current into direct current;

[0015] The pulse current sensor is used to detect the pulse current in the grounding wire of the grounding electrode when the simulation experimental platform generates partial discharge, and obtain the discharge amount;

[0016] The digital partial discharge comprehensive analyzer is used to display the discharge phase-discharge amount scatter diagram according to the discharge amount measured by the pulse current sensor.

[0017] Preferably, the simulation experiment platform is used to simulate local overheating faults, local discharge faults and metal particle discharge faults.

[0018] Preferably, the simulation experiment platform is used to first turn on the power of the temperature control unit, and simulate the situation when an overheating fault occurs inside the experiment platform by adjusting the temperature control unit, while regulating the fault temperature during the simulated overheating fault to conduct a local overheating experiment.

[0019] Preferably, the simulation experimental platform is used to connect an external high-voltage power supply between the two copper round nuts under the flat electrode, adjust the potential difference applied between the positive and negative electrodes by adjusting the power supply voltage, generate a local discharge phenomenon between the two electrodes, thereby simulating a transformer local discharge fault, and use a measuring unit to monitor the fault in real time.

[0020] Preferably, the simulation experiment platform is used to inject 9g of iron particles with a diameter of 150μm into the transformer oil through the oil inlet of the circulation device, and the particle size reaches about 3600 particles per 100mL to simulate the actual pollution level of the particles. Then, the transformer oil is made to flow in the device through the flow rate control unit to simulate the operation process of the actual transformer, and the movement of the internal metal particles is observed by an external observation system, and then a metal particle discharge experiment is carried out. When shooting the movement of the metal particles, ensure that the relative positions of the light source, the main oil channel and the high-speed camera are in a straight line, adjust the distance between the high-speed camera and the oil channel, fine-tune the lighting angle and the shooting angle, ensure that the camera field of view is in the electrode gap, and the outline of the metal particles in the focus area is clear and sharp, and the background color is uniform.

[0021] Preferably, the device is also used to perform gas production test on all the oil samples obtained, and to analyze the faulty oil samples using the three-ratio method.

[0022] The present invention discloses the following technical effects:

[0023] The present invention builds a typical transformer disaster simulation component to more accurately simulate various working conditions and fault conditions of actual transformers. When simulating actual transformer partial faults (including local overheating faults, local discharge faults and metal particle discharge faults), by optimizing the structure of the simulation experiment platform, the problem that the simulation experiment platform is difficult to accurately simulate faults is solved, and the simulation accuracy in specific fault scenarios is improved. The present invention provides a more reliable means for the accurate assessment of transformer faults, thereby providing effective support for the safe and stable operation of the power system. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments will be briefly introduced below. 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 paying creative work.

[0025] Figure 1 It is a schematic diagram of the method flow of the present invention;

[0026] Figure 2It is a schematic diagram of the structure of the test platform described in the present invention, wherein 1 is an insulating screw, 2 is a needle electrode, 3 is a flat electrode, 4 is a pulse current sensor, 5 is an input adapter, and 6 is a digital partial discharge comprehensive analyzer. DETAILED DESCRIPTION

[0027] To make the purpose, technical scheme and advantages of the embodiments of the present application clearer, the technical scheme in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all of the embodiments. The components of the embodiments of the present application generally described and shown in the drawings here can be arranged and designed in various different configurations. Therefore, the following detailed description of the embodiments of the present application provided in the drawings is not intended to limit the scope of the application claimed for protection, but merely represents the selected embodiments of the present application. Based on the embodiments of the present application, all other embodiments obtained by those skilled in the art without making creative work belong to the scope of protection of the present application.

[0028] like Figure 1-2 As shown, the present invention provides a reactor fault equivalent experimental method based on a typical disaster simulation component of a transformer, the method comprising:

[0029] S1: Build typical transformer disaster simulation components;

[0030] S2: By adjusting the heating time, the voltage intensity applied to the electrodes and injecting metal particles into the transformer insulating oil, the local faults that occur during the operation of the actual transformer are simulated;

[0031] S3: Collect insulating oil samples when various local faults occur in transformer simulation components;

[0032] S4: Detect characteristic gases in each group of oil samples and analyze the oil samples under different fault conditions;

[0033] The method of building a typical transformer disaster simulation component specifically includes:

[0034] In order to simulate the overheating and discharge faults that transformer oil may encounter in actual work, a transformer simulation experimental platform was designed based on the structural parameters and physical model of the actual transformer, under the premise of comprehensively considering multiple physical fields such as temperature field, electric field, flow velocity field, etc. The experimental platform takes into account the basic functions and fault types of the actual transformer, and is mainly composed of the main oil channel, oil pump, temperature control unit, flow velocity control unit, ball-plate electrode and other parts.

[0035] The temperature control unit consists of a temperature sensor, a heating wire, an intelligent digital display temperature controller, etc., which can monitor and adjust the transformer oil temperature in the device in real time.

[0036] The flow rate control unit is mainly composed of an oil pump, which can drive the transformer oil to circulate in the system at a specific flow rate in the simulation experimental platform. The flow rate control system changes the oil pump speed through the frequency converter, which can realize continuous adjustment of the oil flow rate.

[0037] The ball-plate electrode includes a grounding globe electrode and a high-voltage flat plate electrode 3. The power supply unit is used to provide a test voltage for the high-voltage electrode. The electrode is connected to the flange, and two copper round nuts and a ball electrode are connected to the connecting electrode. The other side of the flange is connected to the flat plate electrode, and the other side is connected to two copper round nuts and an electrode on the flange (the needle electrode and the ball electrode are both grounding electrodes, but they can be switched at any time according to the experimental requirements. The flat plate electrode is a high-voltage electrode. Both electrodes will be connected to the flange and two copper round nuts (used to connect the high-voltage wire or the ground wire), which are clamped and fixed by two nuts).

[0038] Local faults include local overheating faults, local discharge faults and metal particle discharge faults.

[0039] When using the transformer simulation experimental platform to conduct a local overheating experiment, first turn on the power of the temperature control unit, and adjust the temperature control unit to simulate the situation when an overheating fault occurs inside the experimental platform, while regulating the fault temperature during the simulated overheating fault.

[0040] The temperature control unit consists of a temperature sensor, a heating wire, an intelligent digital display temperature controller, etc., which can monitor and adjust the transformer oil temperature in the device in real time.

[0041] When the partial discharge experiment is carried out using the transformer simulation experimental platform, an external high-voltage power supply is connected between the two copper round nuts under the flat electrode. The potential difference applied between the positive and negative electrodes is adjusted by adjusting the power supply voltage to generate a partial discharge phenomenon between the two electrodes, thereby simulating a transformer partial discharge fault, and the fault is monitored in real time using a measurement unit.

[0042] The measuring unit includes a pulse current sensor 4, an input adapter 5 and a digital partial discharge comprehensive analyzer 6 which are connected in sequence. The pulse current sensor 4 is connected to the grounding electrode, wherein the input adapter 5 is used to convert alternating current into direct current; the pulse current sensor 4 is used to detect the pulse current in the grounding wire of the grounding electrode when the simulation experimental platform generates partial discharge, and obtain the discharge amount; the digital partial discharge comprehensive analyzer 6 is used to display a discharge phase-discharge amount scatter diagram according to the discharge amount measured by the pulse current sensor 4.

[0043] When using the transformer simulation experimental platform to conduct a metal particle discharge experiment, 9g of iron particles with a diameter of 150μm are injected into the transformer oil through the oil inlet of the circulation device. The particle size reaches about 3600 particles per 100mL to effectively simulate the actual pollution level of the particles. Then, the transformer oil is made to flow in the device through the flow rate control unit to simulate the operation process of the actual transformer. The movement of the internal metal particles can be observed using an external observation system.

[0044] The flow rate control unit is mainly composed of an oil pump, which can drive the transformer oil to circulate in the system at a specific flow rate in the simulation experimental platform. The flow rate control system changes the oil pump speed through the frequency converter, which can realize continuous adjustment of the oil flow rate.

[0045] The external observation system is mainly composed of high-speed cameras with a maximum frame rate of 225,000 frames / s, macro lenses, uninterruptible power supplies, computers, high-speed network cables and other equipment and devices.

[0046] When shooting the movement of metal particles, it is necessary to ensure that the relative positions of the light source, the main oil channel and the high-speed camera are in a straight line, adjust the distance between the high-speed camera and the oil channel, fine-tune the lighting angle and the shooting angle, ensure that the camera's field of view is in the electrode gap, and that the outline of the metal particles in the focus area is clear and sharp, and the background color is uniform.

[0047] When collecting fault oil samples, use a glass needle connected to a hard plastic tube via a soft rubber tube to extend into the equipment from the oil filling port to collect 40 ml of oil sample for subsequent testing.

[0048] When collecting fault oil samples, the oil inlet end of the hard plastic tube should be placed in the center of the ball-plate electrode as much as possible.

[0049] For the three local fault types, several groups of experiments are set for each fault type.

[0050] All the oil samples obtained were tested for gas production, and the faulty oil samples were analyzed using the three-ratio method.

[0051] It can be seen from the above technical solution that the present invention provides a reactor fault equivalent experimental device based on a typical disaster simulation component of a transformer. By building a typical disaster simulation component of a transformer, various working conditions and fault conditions of an actual transformer can be more accurately simulated. When simulating actual transformer partial faults (including local overheating faults, local discharge faults, and metal particle discharge faults), the problem that the simulation experiment platform is difficult to accurately simulate faults is solved by optimizing the structure of the simulation experiment platform, and the simulation accuracy in specific fault scenarios is improved. The present invention provides a more reliable means for the accurate assessment of transformer faults, thereby providing effective support for the safe and stable operation of the power system.

[0052] The present invention is described with reference to flowcharts and / or block diagrams of methods, devices (systems), and computer program products according to embodiments of the present invention. It should be understood that each process and / or block in the flowchart and / or block diagram, as well as the combination of processes and / or blocks in the flowchart and / or block diagram, can be implemented by computer program instructions. These computer program instructions can be provided to a processor of a general-purpose computer, a special-purpose computer, an embedded processor, or other programmable data processing device to produce a machine, so that the instructions executed by the processor of the computer or other programmable data processing device generate instructions for implementing the processes in the flowchart and / or block diagram. Figure 1 A process or multiple processes and / or boxes Figure 1 A device that provides the functions specified in a block or multiple blocks.

[0053] In the description of the present invention, it should be understood that the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of the features. In the description of the present invention, the meaning of "plurality" is two or more, unless otherwise clearly and specifically defined.

[0054] Obviously, those skilled in the art can make various changes and modifications to the present invention without departing from the spirit and scope of the present invention. Thus, if these modifications and variations of the present invention fall within the scope of the claims of the present invention and their equivalents, the present invention is also intended to include these modifications and variations.

Claims

1. A reactor fault equivalent experimental device based on a typical transformer disaster simulation component, characterized in that: include: A power supply unit, used for providing a test voltage to the high voltage electrode; The reactor fault simulation model unit comprises a needle electrode, a plate electrode and an insulating screw, wherein the needle electrode is a ground electrode; the plate electrode is a high-voltage electrode; one end of the insulating screw is fixedly connected to the ground electrode to control the electrode distance; Measuring unit for measuring the discharge of electrodes under static conditions.

2. The reactor fault equivalent experimental device based on the typical disaster simulation component of the transformer according to claim 1 is characterized by: The flat plate electrode and the grounded needle electrode form a needle-plate electrode, which together with the main oil channel, oil pump, temperature control unit and flow rate control unit form a transformer simulation experimental platform for simulating local faults occurring during the operation of the transformer.

3. The reactor fault equivalent experimental device based on the transformer typical disaster simulation component according to claim 2 is characterized by: The temperature control unit is composed of a temperature sensor, a heating wire and an intelligent digital display temperature controller, and is used for real-time monitoring and regulating the transformer oil temperature in the device.

4. The reactor fault equivalent experimental device based on the transformer typical disaster simulation component according to claim 3 is characterized by: The flow rate control unit is composed of an oil pump, which can drive the transformer oil to circulate in the system at a specific flow rate in the simulation experimental platform. The flow rate control system changes the oil pump speed through a frequency converter to achieve continuous adjustment of the oil flow rate.

5. The reactor fault equivalent experimental device based on the typical disaster simulation component of the transformer according to claim 4 is characterized in that: The measuring unit comprises a pulse current sensor, an input adapter and a digital partial discharge comprehensive analyzer which are connected in sequence; The pulse current sensor is connected to a ground electrode, wherein the input adapter is used to convert alternating current into direct current; The pulse current sensor is used to detect the pulse current in the grounding wire of the grounding electrode when the simulation experimental platform generates partial discharge, and obtain the discharge amount; The digital partial discharge comprehensive analyzer is used to display a discharge phase-discharge amount scatter diagram according to the discharge amount measured by the pulse current sensor.

6. The reactor fault equivalent experimental device based on the typical disaster simulation component of the transformer according to claim 5 is characterized by: The simulation experiment platform is used to simulate local overheating faults, local discharge faults and metal particle discharge faults.

7. The reactor fault equivalent experimental device based on the transformer typical disaster simulation component according to claim 6 is characterized by: The simulation experiment platform is used to first turn on the power of the temperature control unit, and simulate the situation when an overheating fault occurs inside the experiment platform by adjusting the temperature control unit, while regulating the fault temperature during the simulated overheating fault to conduct a local overheating experiment.

8. The reactor fault equivalent experimental device based on the transformer typical disaster simulation component according to claim 7 is characterized by: The simulation experiment platform is used to connect an external high-voltage power supply between two copper round nuts under the flat electrode, adjust the potential difference applied between the positive and negative electrodes by adjusting the power supply voltage, generate a local discharge phenomenon between the two electrodes, thereby simulating a transformer local discharge fault, and use a measurement unit to monitor the fault in real time.

9. The reactor fault equivalent experimental device based on the transformer typical disaster simulation component according to claim 8 is characterized by: The simulation experiment platform is used to inject 9g of iron particles with a diameter of 150μm into the transformer oil through the oil inlet of the circulation device, and the particle size reaches about 3600 particles per 100mL to simulate the actual pollution level of the particles, and then the transformer oil is made to flow in the device through the flow rate control unit to simulate the operation process of the actual transformer, and the movement of the internal metal particles is observed by using the external observation system, and then the metal particle discharge experiment is carried out. When shooting the movement of the metal particles, it is ensured that the relative positions of the light source, the main oil channel and the high-speed camera are in a straight line, and the distance between the high-speed camera and the oil channel is adjusted, and the lighting angle and the shooting angle are fine-tuned to ensure that the camera field of view is in the electrode gap, and the metal particle contours in the focus area are clear and sharp, and the background color is uniform.

10. The reactor fault equivalent experimental device based on the transformer typical disaster simulation component according to claim 9 is characterized in that: The device is also used to perform gas production tests on all oil samples obtained and to analyze faulty oil samples using the three-ratio method.

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