Automatic Detection Device and Method for Aging Degree and Parameters of Transformer Oil-Paper Insulation System

Abstract

The present invention provides an automatic detection device for the aging degree and parameters of a transformer oil-paper insulation system, which includes a main oil tank, a partition device, a sampling plate, a sampling grid, a specimen table, a heating device, a sampling door, a high-voltage electrode, etc.; the detection module includes a breakdown voltage measurement module, a temperature monitoring module, and a furfural content monitoring module in oil; the main oil tank is a box for accelerating aging experiments and automatically measuring parameters, which is separated by a partition device in the middle; the sampling plate is composed of a partition board and a sampling grid, and can complete individual real-time sampling of paper-covered copper according to the terminal command; the heating device is composed of an infrared heating lamp, measures the oil sample temperature through a surface acoustic wave temperature sensor, and regularly sends real-time temperature information to the terminal; the high-voltage electrode adopts a plate-plate electrode, and the specimen table and the high-voltage electrode cooperate to realize the simultaneous measurement of the aging parameters of the oil-paper; the present invention can realize the real-time aging degree monitoring of the transformer oil-paper insulation system and the wireless transmission of experimental data, and has the characteristics of simplicity and visualization.

Description

Technical Field

[0001] The present invention relates to an automatic detection device and method for the aging degree and parameters of a transformer oil-paper insulation system, belonging to the field of transformer insulation monitoring and fault diagnosis. Background Art

[0002] The transformer is the core of energy conversion and transmission in the power grid, and the equipment is expensive. Its operation reliability is related to the economy and stability of the power grid. In recent years, sulfur corrosion faults of transformers have occurred frequently, causing a large amount of economic losses and posing potential safety hazards to the power grid. Therefore, many scholars at home and abroad have carried out research on sulfur corrosion faults of transformer oil-paper insulation systems. However, the current equipment for accelerating the thermal aging experiment of transformer oil-paper insulation systems is relatively backward, still requiring a lot of manual operations, increasing the use of manpower, and lacking automated equipment. Therefore, timely and effectively automating the upgrade of the aging experiment equipment for transformer oil-paper insulation systems, and then accelerating and simplifying the aging test steps, has important practical significance for the research on sulfur corrosion faults.

[0003] When the current aging test equipment conducts an experiment, after the aging is completed, if one wants to know the aging degree or measure parameters, the experimental personnel need to take out the oil sample from the oil tank and add it to the equipment for measuring parameters, and then perform setting operations on other measuring equipment. The data obtained after the operation also needs to be summarized by the personnel from each equipment to the terminal. The entire process requires the experimental personnel to be in the laboratory, which is cumbersome and labor-consuming. In addition, the current aging test equipment cannot monitor the aging degree in real time during the aging process, and the monitoring of aging is weak. Therefore, it is necessary to design a wireless transmission aging experiment device that can automatically and real-time transmit the aging degree data and automatically detect characteristic parameters, which is also the design difficulty of the device and method. Summary of the Invention

[0004] The present invention provides an automatic detection device and method for the aging degree and parameters of a transformer oil-paper insulation system. The experimental device can simultaneously realize real-time aging degree monitoring of the transformer oil-paper insulation system, automatic measurement of aging parameters, and wireless transmission of experimental data, and has the characteristics of being sealed, simple, and visual.

[0005] To achieve the above object, the present invention adopts the following technical solution: An automatic detection device for the aging degree and parameters of a transformer oil-paper insulation system, characterized in that: it includes a main oil tank, a partition device, a sampling plate, a sampling table, a heating device, a high-voltage electrode, and other parts.

[0006] The main fuel tank is a box for accelerated aging experiments and automatic measurement of parameters. It is made of quartz glass and separated in the middle by a partition device. The partition device consists of two pieces of quartz glass, which separates the aging experiment in the main fuel tank from the measurement of aging parameters, achieving the function of dual use of one box. The main fuel tank has two oil outlet valves. The upper oil outlet valve can be used to take samples of the aged oil sample, and the lower oil outlet valve can discharge the oil sample after measuring the breakdown voltage, realizing the treatment of two kinds of oil samples.

[0007] The partition device is divided into two partition plates on the left and right. Pulling arms are installed on the two plates, and a control system and a ZigBee network module are installed inside the pulling arms. It can be controlled by a terminal for switching. When the command to open the partition is sent, the partition plate will open from the horizontal to the inclined position.

[0008] The sampling plate is composed of a partition board and sampling grids. There are guide rails between the sampling plate and the main fuel tank. By sending an open command through terminal control, the length of the sampling plate sliding out of the main fuel tank body can be controlled. When placing and taking the paper-wrapped copper specimens, the two sampling plates on the left and right will slide out of the main fuel tank body by themselves. One paper-wrapped copper specimen can be placed in each sampling grid. After placing, the terminal controls the closing of the sampling plate, and the sampling plate slides back into the main fuel tank body. The sampling plate also plays a role in separating the oil layer. When an oil sample needs to be taken during the aging process, the interval of opening the sampling plate can be controlled according to the required amount of oil, and a certain amount of oil sample is released above the partition device to complete the sampling of the oil sample.

[0009] The sampling grid consists of one grid, two grid doors and two grid buckles. When a specimen needs to be placed, open the grid door on the top of the grid, put in the specimen, and after placing it, the grid door needs to be placed under the grid buckle to complete closing the door. When sampling is needed, open the grid door at the bottom of the grid, and the specimen will slide out automatically, and then close the grid door. The entire process can be automatically controlled by the terminal to open and close the grid door. When taking paper-wrapped copper specimens, the number of sampling grids to be opened can be controlled according to the required specimens, and a certain amount of paper-wrapped copper specimens are released above the partition device to complete the sampling of the paper-wrapped copper specimens.

[0010] The specimen stage is composed of a disc platform and a cylindrical telescopic cylinder. After taking an appropriate amount of oil sample and paper-wrapped copper specimens, the partition device is opened through the terminal. The partition device cooperates with the raised telescopic cylinder to guide the specimens onto the sampling stage. After completion, the telescopic cylinder and the partition device are retracted, and the next operation is carried out. Among them, the telescopic cylinder can be automatically raised and retracted into the platform according to the command of the control system, playing a role in fixing the position of the specimens. The telescopic cylinder is made of resin polymerization material, and the disc platform is made of quartz glass.

[0011] The heating device consists of an infrared heating lamp. The temperature of the oil sample is measured by a surface acoustic wave temperature sensor, and real-time temperature information is sent to the terminal regularly.

[0012] The sampling door refers to a movable door at the lower right corner of the fuel tank, which can be opened when the tested paper-wrapped copper sample needs to be processed.

[0013] The high-voltage electrode adopts a plate-plate electrode, and the electrode is made of brass material; the left and right electrodes are both discs made of brass material, the left side is connected to the high-voltage power supply, and the right side is connected to the ground wire.

[0014] The breakdown voltage measurement module includes a power supply, a control circuit, a reversible circuit, a voltage regulator, a boost test module and a data output module. The data output module is connected to the central node of the wireless network and is connected to the terminal through the ZigBee network. The data output module can send the breakdown voltage test result to the terminal, and the terminal can also send a test instruction to the breakdown voltage test module.

[0015] The temperature monitoring module includes a surface acoustic wave temperature sensor and its antenna, wherein the surface acoustic wave temperature sensor includes a surface acoustic wave resonator and an antenna; the surface acoustic wave resonator is embedded on the oil tank, and the antenna is mounted on the resonator. Through the antenna, that is, through the ZigBee network, it communicates with the terminal, and can send oil sample temperature information to the terminal in real time during the aging process.

[0016] The furfural content monitoring module in oil includes a sampling hose, a liquid chromatograph and a data processing terminal provided with the liquid chromatograph. The sampling hose is placed in the oil tank to sample the oil. The liquid chromatograph is used to measure the furfural content in the oil, and the data is transmitted to the data processing terminal provided with the liquid chromatograph. The data processing terminal provided with the liquid chromatograph contains a ZigBee module, which can communicate with the terminal through the ZigBee network, and can send information on the furfural content of the oil sample to the terminal in real time during the aging process.

[0017] The beneficial effects of the present invention are as follows: the experimental device can realize wireless data transmission, automatic detection of aging characteristic parameters, and automatic real-time transmission of the aging degree of the oil sample, thereby realizing the monitoring of the oil sample aging process, simplifying the aging experiment steps, and saving manpower, and ultimately achieving the purpose of remote terminal control of the experimental process. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 This is a diagram of the automatic detection device for the aging degree and parameters of the transformer oil-paper insulation system.

[0019] Figure 2 This is the structural diagram of the sampling board of the automatic detection device for the aging degree and parameters of the transformer oil-paper insulation system.

[0020] Figure 3 This is a front view of the retractable cylinder of the sample table of the automatic detection device for the aging degree and parameters of the transformer oil-paper insulation system. DETAILED DESCRIPTION

[0021] The present invention will be further described below in conjunction with the accompanying drawings and embodiments.

[0022] An automatic detection device for the aging degree and parameters of a transformer oil-paper insulation system, characterized in that it includes a main oil tank, a partition device, a sampling plate, a sampling table, a heating device, a high-voltage electrode, etc.; the main oil tank is a box for accelerating the aging experiment and automatically measuring parameters, made of quartz glass and separated in the middle by a partition device; the partition device consists of two pieces of quartz glass, separating the aging experiment in the main oil tank from measuring the aging parameters, realizing the function of dual use of one box; the main oil tank is equipped with two oil outlet valves, the upper oil outlet valve can be used to sample the aged oil sample, and the lower oil outlet valve can discharge the oil sample after measuring the breakdown voltage, realizing the treatment of two kinds of oil samples; the partition device is divided into left and right partition plates, with pull arms installed on the two plates, and a control system and a ZigBee network module are installed inside the pull arms, which can be controlled by a terminal for switching. When the command to open the partition is sent, the partition plate will open from the horizontal to the inclined; the sampling plate is composed of a partition and sampling cells, there is a guide rail between the sampling plate and the main oil tank, and by sending an open command through terminal control, the length of the sampling plate sliding out of the main oil tank body can be controlled. When placing and taking out the paper-covered copper specimen, the left and right sampling plates will slide out of the main oil tank by themselves. One paper-covered copper specimen can be placed in each sampling cell. After placement, the terminal controls the sampling plate to close, and the sampling plate slides back into the main oil tank body; the heating device consists of an infrared heating lamp, measures the oil sample temperature through a surface acoustic wave temperature sensor, and regularly sends real-time temperature information to the terminal; the sampling door refers to a movable door at the lower right corner of the oil tank part, which can be opened when it is necessary to process the tested paper-covered copper specimen; the high-voltage electrode adopts a plate-plate electrode, and the electrode is made of brass material; both the left and right electrodes are discs made of brass material, the left side is connected to the high-voltage power supply, and the right side is grounded.

[0023] When aging samples are needed, a command is sent through the terminal, the sampling plate slides out of the main fuel tank body, all sampling grids are opened, and paper-wrapped copper samples are placed in the sampling grids; after placing the paper-wrapped copper samples, the sampling plate is placed back into the main fuel tank body; the partition is closed through the Zigbee network control, and the partition device is divided into two left and right partition plates, and the two plates are equipped with pulling arms, and the control system and ZigBee network module are installed on the inside of the pulling arms. When the partition needs to be opened or closed, the terminal sends a command to the pulling arm; open the oil filling valve and the infrared heating lamp, and after adding the oil sample, close the oil filling valve; control the infrared heating lamp through the Zigbee network to heat up, and during the aging period, the temperature monitoring module and the furfural content monitoring module in the oil send the oil sample aging information to the terminal in real time to ensure the intensity of monitoring the degree of oil sample aging. The temperature monitoring module includes a surface acoustic wave temperature sensor and its antenna, wherein the surface acoustic wave temperature sensor includes a surface acoustic wave resonator and an antenna; the surface acoustic wave resonator is embedded on the oil tank, and the antenna is mounted on the resonator. Through the antenna, that is, through the ZigBee network, it communicates with the terminal, and can send the oil sample temperature information to the terminal in real time during the aging process; the furfural content monitoring module in the oil includes a sampling hose, a liquid chromatograph and a data processing terminal with the liquid chromatograph. The sampling hose is placed in the oil tank to sample the oil, and the liquid chromatograph is used to measure the furfural content in the oil, and the data is transmitted to the built-in data processing terminal. The built-in data processing terminal of the liquid chromatograph contains a ZigBee module, which can communicate with the terminal through the ZigBee network, and can send the information of the furfural content of the oil sample to the terminal in real time during the aging process; in addition, during the aging process of the oil-paper insulation system, if you want to detect the oil-paper breakdown voltage in real time, you can control the number of sampling grids to be opened according to the required samples, and the sampling plate structure is as follows: Figure 2 The sampling grid consists of a grid, two grid doors and two grid buckles. When it is necessary to place a sample, open the grid door above the grid and put the sample in. After placing it, put the grid door under the grid buckle to complete the door closing; when sampling is required, open the grid door below the grid, the sample automatically slides down, and then close the grid door. The whole process can be automatically executed by the terminal control. The grid door releases a certain amount of paper-wrapped copper sample to above the partition device to complete the sampling of the paper-wrapped copper sample. If the amount of oil above the partition device and below the sampling plate is small, the interval of opening the sampling plate can be controlled by the terminal to obtain sufficient oil to complete the sampling of the oil sample, and then the retractable cylinder of the sample table is raised. The retractable cylinder of the sample table is as follows Figure 3As shown, the retractable cylinder can automatically rise and retract into the platform according to the command of the control system, and plays the role of fixing the position of the sample. The partition device is opened to guide the sample to the sample table, and the partition device is closed to ensure good insulation and prepare for the breakdown voltage test; the terminal controls to open the breakdown voltage test module, in which the left and right electrodes are discs made of brass material, the left side is connected to the high-voltage power supply, and the right side is connected to the ground wire; the breakdown voltage measurement module contains a power supply, a control circuit, a reversible circuit, a voltage regulator, a boost test module and a data output module. The data output module is connected to the central node of the wireless network and is connected to the terminal through the ZigBee network. The data output module can send the breakdown voltage test result to the terminal, and the terminal can also send a test instruction to the breakdown voltage test module; after the breakdown voltage is measured, the data is transmitted to the terminal, the remaining oil sample can be discharged from the lower oil outlet valve, and the paper-wrapped copper sample can be processed through the sampling door. At this point, the aging test and parameter measurement are completed.

[0024] In summary, the experimental device can realize wireless data transmission, automatic detection of aging characteristic parameters, and automatic real-time transmission of the aging degree of oil samples, thereby realizing the monitoring of the oil sample aging process, simplifying the aging experiment steps, and saving manpower. It can accurately control the experimental process and respond quickly to adjustments. This experimental platform can meet the transformer oil-paper insulation electric and thermal combined aging fault simulation and sampling measurement, and ultimately achieve the purpose of remote terminal control of the experimental process.

Claims

1. An automatic detection device for the aging degree and parameters of a transformer oil-paper insulation system, characterized in that: It includes a main fuel tank, a partition device, a sampling plate, sampling cells, a specimen stage, a heating device, a sampling door, and a high-voltage electrode part; the detection module includes a breakdown voltage measurement module, a temperature monitoring module, and a furfural content monitoring module in oil. The main fuel tank is a box for accelerated aging experiments and automatic parameter measurement, made of quartz glass and separated in the middle by a partition device; the partition device consists of two pieces of quartz glass, separating the aging experiment in the main fuel tank from the measurement of aging parameters, achieving the function of dual use of one box; the main fuel tank has two oil outlet valves, the upper oil outlet valve is used for sampling the aged oil sample, and the lower oil outlet valve discharges the oil sample after measuring the breakdown voltage, realizing the treatment of two kinds of oil samples. The partition device is divided into left and right partition plates, and a pull arm is installed on the two partition plates. The control system and the ZigBee network module are installed inside the pull arm, and the terminal is used for switch control. When the command to open the partition is sent, the partition plate will open from the horizontal to the inclined position. The sampling plate is composed of a partition board and sampling cells. There is a guide rail between the sampling plate and the main fuel tank. By sending an open command through terminal control, the length of the sampling plate sliding out of the main fuel tank body can be controlled. When placing and taking the paper-wrapped copper specimen, the left and right sampling plates will slide out of the main fuel tank by themselves. One paper-wrapped copper specimen is placed in each sampling cell. After placement, the terminal controls the sampling plate to close and slide back into the main fuel tank body; the sampling plate also plays a role in separating the oil layer. When taking an oil sample during the aging process, the interval of opening the sampling plate is controlled according to the required oil volume, and a certain amount of oil sample is released above the partition device to complete the sampling of the oil sample. The sampling cell consists of a cell, two cell doors, and two cell clasps. When a specimen needs to be placed, open the cell door on the top of the cell, put in the specimen, and after placement, put the cell door under the cell clasp to close the door; when sampling is needed, open the cell door at the bottom of the cell, and the specimen will slide down automatically, and then close the cell door. The entire process is automatically controlled by the terminal to open and close the cell door; when taking a paper-wrapped copper specimen, the opened sampling cell is controlled according to the required specimen, and a certain amount of paper-wrapped copper specimen is released above the partition device to complete the sampling of the paper-wrapped copper specimen. The specimen stage is composed of a disc platform and a cylindrical telescopic cylinder. After taking an appropriate amount of oil sample and paper-wrapped copper specimen, the partition device is opened through the terminal. The partition device cooperates with the raised telescopic cylinder to guide the specimen onto the sampling stage; after completion, the telescopic cylinder and the partition device are retracted for the next operation; among them, the telescopic cylinder automatically rises and retracts into the platform according to the command of the control system, playing a role in fixing the position of the specimen; the telescopic cylinder is made of resin polymer material, and the disc platform is made of quartz glass. The heating device consists of an infrared heating lamp, and the temperature of the oil sample is measured by a surface acoustic wave temperature sensor, and real-time temperature information is sent to the terminal regularly. The sampling door refers to a movable door at the lower right corner of the fuel tank part, which is opened when the tested paper-wrapped copper specimen needs to be processed. The high-voltage electrode adopts a plate-plate electrode, and the electrode is made of brass material; both the left and right electrodes are discs made of brass material, the left side is connected to the high-voltage power supply, and the right side is grounded. The breakdown voltage measurement module includes a power supply, a control circuit, a reversible circuit, a voltage regulator, a boost test module and a data output module. The data output module is connected to the central node of the wireless network and is connected to the terminal through the ZigBee network. The data output module sends the breakdown voltage test result to the terminal, and the terminal can also send a test instruction to the breakdown voltage test module. The temperature monitoring module includes a surface acoustic wave temperature sensor and an antenna thereof, wherein the surface acoustic wave temperature sensor includes a surface acoustic wave resonator and an antenna; the surface acoustic wave resonator is embedded on the oil tank, and the antenna is mounted on the resonator, and communicates with the terminal through the antenna, that is, through the ZigBee network, and sends the oil sample temperature information to the terminal in real time during the aging process; The furfural content monitoring module in oil includes a sampling hose, a liquid chromatograph and a data processing terminal provided with the liquid chromatograph. The sampling hose is placed in the oil tank to sample the oil. The furfural content in the oil is measured using the liquid chromatograph, and the data is transmitted to the data processing terminal provided with the liquid chromatograph. The data processing terminal provided with the liquid chromatograph contains a ZigBee module, which communicates with the terminal through the ZigBee network, and sends information on the furfural content of the oil sample to the terminal in real time during the aging process.

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