An on-line oil replacement system and method for a transformer voltage regulating switch

Abstract

The present invention relates to an on-line replacement system and method for the oil of a transformer voltage regulating switch, comprising: an oil tank, an oil bladder, an oil tank drain pump, an oil bladder inlet pump, a weighing device and a control device. The oil bladder is installed inside the oil tank, and the oil bladder and the oil tank are respectively connected to the transformer voltage regulating switch through a first pipeline and a second pipeline. The oil bladder inlet pump and the oil tank drain pump are respectively installed on the first pipeline and the second pipeline, and are respectively used for injecting the waste oil inside the transformer voltage regulating switch into the oil bladder, and injecting the qualified oil inside the oil tank into the transformer voltage regulating switch. The oil tank drain pump is connected to the control device, and the control device includes a weighing device for sending the measured weight signal to the control device. The control device controls the flow rate of the oil tank drain pump so that the difference between the real-time weight of the oil tank and the initial weight of the oil tank is less than a preset threshold, thereby realizing the replacement of the oil of the transformer voltage regulating switch.

Description

Technical Field

[0001] The invention relates to the technical field of transformer voltage regulating switch oil replacement, and in particular to a transformer voltage regulating switch oil online replacement system and method. Background Art

[0002] The transformer voltage regulator is a key device in the power substation system, also known as the on-load tap changer. Its reliability is directly related to the safe and stable operation of the power system. The failure of the transformer voltage regulator is often caused by the long-term operation of the transformer voltage regulator. Under the action of long-term working voltage, the insulating oil inside the transformer voltage regulator will gradually age and deteriorate, resulting in a decrease in the insulation performance of the insulating oil inside the transformer voltage regulator. The specific reasons are: First, the insulating oil inside the transformer voltage regulator is a mixture composed of various hydrocarbon components, which makes it under the influence of internal chemical reactions and external environmental factors. The most important reason is the effect of oxygen, especially in some metal parts. Due to the influence of water, the oxidation rate of the oil will be greatly increased, causing a significant change in the quality of the oil. In the above chemical change process, the quality of the insulating oil inside the transformer voltage regulator itself will also be affected. At present, it is generally reduced by adding an oil pillow on the upper part of the transformer voltage regulator oil tank to reduce the contact area between the transformer voltage regulator oil and oxygen, thereby reducing the oxidation rate of the transformer voltage regulator oil. Second, the insulating oil contains corrosive substances, which will react chemically with the copper conductor in the transformer voltage regulator to form cuprous sulfide with poor insulation performance, which will pollute the insulating oil and reduce the insulation strength of the insulating oil, eventually leading to a breakdown event of the transformer voltage regulator, which in turn leads to a failure of the transformer voltage regulator. Third, after long-term use, the transformer voltage regulator itself will produce impurities formed by sediment and detached materials, which will affect the insulation effect. At present, the precipitation method is generally used, but the bottom impurities are easily stirred up during the flow of insulating oil. Fourth, after long-term use, water and gas will mix into the insulating oil, reducing the insulation strength. At present, vacuum oil purging devices are generally used for filtration.

[0003] At present, the above three oil treatment methods are all carried out separately, and the equipment used is complex, loading and unloading is complicated, and the operation is cumbersome. It is not convenient to treat the oil of multiple transformer voltage regulators, nor is it convenient to transfer equipment between multiple transformer voltage regulators. In addition, the transformer voltage regulator needs to be powered off during the operation, which is difficult to implement in areas with heavy power supply pressure. The application scheduling procedure is complicated. At the same time, the vacuum oil removal operation takes a long time, which increases the power supply pressure of the power outage operation on production and life. There are problems in the replacement process, such as many equipments need to be carried and the operation is complicated.

[0004] To address the above-mentioned problems, no effective solution has been proposed yet. Summary of the invention

[0005] Based on this, the present invention discloses an on-line replacement system and method for insulating oil, which can replace the deteriorated insulating oil inside the transformer tap changer while the tap changer is energized, so as to solve the problems of a large number of devices to be carried and complex operation during the replacement process.

[0006] The technical solution is as follows:

[0007] An on-line replacement system for transformer tap changer oil, comprising: a fuel tank with an oil bladder built therein, a fuel tank drain pump, an oil bladder inlet pump, a weighing device for weighing the fuel tank, and a control device;

[0008] The inlet of the oil bladder is connected to the drain port of the transformer tap changer through a first pipeline, and the oil bladder inlet pump is installed on the first pipeline for injecting the waste oil inside the transformer tap changer into the oil bladder through the first pipeline;

[0009] The space between the fuel tank and the oil bladder is used to store qualified oil for the first use. A fuel tank drain port is provided at the top of the fuel tank. The fuel tank drain port is connected to the inlet of the transformer tap changer through a second pipeline, and the fuel tank drain pump is installed on the second pipeline for injecting the qualified oil inside the fuel tank into the transformer tap changer;

[0010] The control device includes a computer, a pump driver, and a weighing device. The weighing device is respectively connected to the fuel tank and the computer. The weighing device is used to measure the weight of the fuel tank in real time and send the measured weight signal to the computer;

[0011] The pump driver is respectively connected to the computer, the fuel tank drain pump, and the second pipeline. The computer sends a control signal to the pump driver according to the weight signal, and the pump driver controls the flow rate of the fuel tank drain pump according to the control signal, so that the difference between the weight of the fuel tank and the initial weight of the fuel tank is within the range of a preset threshold.

[0012] Optionally, the control device further includes: a liquid level gauge installed inside the transformer tap changer and connected to the computer; wherein, the computer sends a control signal to the pump driver according to the weight signal, and the pump driver controls the flow rate of the fuel tank drain pump according to the control signal, so that the difference between the weight of the fuel tank and the initial weight of the fuel tank is within the range of a preset threshold, including:

[0013] When the liquid level gauge measures that the oil quantity of the transformer tap-changer is higher than the reference, showing an upward trend, and the current weight of the oil tank is less than the initial weight set for the oil tank, the computer sends a control signal to the oil pump driver to reduce the flow rate of the oil drain pump of the oil tank until the oil quantity of the transformer tap-changer shows a downward trend and the difference between the weight of the oil tank and the initial weight of the oil tank is within the range of a preset threshold value;

[0014] When the liquid level gauge measures that the oil quantity of the transformer tap-changer is lower than the reference, showing a downward trend, and the weight of the oil tank is greater than the initial weight set for the oil tank, the computer sends a control signal to the oil pump driver to increase the flow rate of the oil drain pump of the oil tank until the oil quantity of the transformer tap-changer shows an upward trend and the difference between the weight of the oil tank and the initial weight of the oil tank is within the range of a preset threshold value.

[0015] Optionally, it further includes an oil quality monitoring device, which is installed inside the transformer tap-changer and connected to the computer to monitor the quality of the oil inside the transformer tap-changer in real time, and send the monitored oil quality signal to the control device, so as to enable the oil quality monitoring device to control the start or stop of the oil drain pump and the oil bladder inlet pump of the oil tank according to the oil quality signal.

[0016] Optionally, it further includes lifting lugs installed on the upper part of the oil tank for hanging the oil tank on the bracket for fixing the transformer tap-changer, and the weighing device is installed on the lifting lugs for measuring the weight of the oil tank and sending the measured weight signal to the computer in real time.

[0017] Optionally, historical data among the quality of the oil in the transformer tap-changer, the quality of the qualified oil in the transformer tap-changer, the number of switch operations, and the replacement duration is established, the volume of the qualified oil accommodated in the oil tank is determined, and when the oil in the transformer tap-changer needs to be replaced, the volume of the required qualified oil is displayed.

[0018] The volume V1 of the oil tank is 5 times the volume of the oil in the transformer tap-changer;

[0019] The determination of the volume V2 of the qualified oil accommodated in the oil tank during each replacement process includes:

[0020] V2 = (A + B + C + D)V1

[0021] A is the quality of the current oil, B is the quality of the qualified oil in the transformer tap-changer, C is the number of switch operations, and D is the weight of the replacement duration.

[0022] Optionally, the present application further provides an on-line oil replacement method for a transformer voltage regulating switch, including using the above-mentioned on-line oil replacement system for the transformer voltage regulating switch to replace the oil inside the transformer voltage regulating switch.

[0023] Compared with the prior art, the beneficial effects of the present application are as follows:

[0024] The on-line oil replacement system for the transformer voltage regulating switch provided by the present application uses an inflatable oil bag installed inside the oil tank. The qualified oil can be placed in the oil tank and the waste oil can be placed in the oil bag, or vice versa. That is, the oil bag contains the qualified oil and the oil tank contains the waste oil. The following description takes the former example. Connect the oil inlet of the oil bag to the oil drain port of the transformer voltage regulating switch through the first pipeline, and inject the waste oil inside the oil tank of the transformer voltage regulating switch into the oil bag through the oil bag inlet oil pump installed on the first pipeline. The space between the oil tank and the oil bag is used to store the qualified oil. There is an oil tank drain port at the bottom of the oil tank. The oil tank drain port is connected to the oil inlet of the transformer voltage regulating switch through the second pipeline. The oil tank drain oil pump is installed on the second pipeline and is used to inject the qualified oil inside the oil tank into the transformer voltage regulating switch. Moreover, the on-line replacement system further includes a control device, which includes a computer, an oil pump driver, and a weighing device. The weighing device is respectively connected to the oil tank and the computer. The weighing device is used to measure the weight of the oil tank in real time and send the measured weight signal to the computer. The oil pump driver is respectively connected to the computer and the oil tank drain oil pump. The computer sends a control signal to the oil pump driver according to the weight signal. The oil pump driver controls the flow rate of the oil tank drain oil pump according to the control signal, so that the difference between the weight of the oil tank and the initial weight of the oil tank is within a preset threshold range. It can be seen from this that the insulating oil belt replacement device provided by the present application can realize the function of replacing the oil inside the transformer voltage regulating switch through an oil tank equipped with an oil bag and a weighing device installed on the oil tank. And through the weighing device, the oil outlet speed of the oil tank can be controlled, so that the total oil output of the oil tank is equal to the total oil input of the oil bag. Furthermore, when replacing the oil inside the transformer voltage regulating switch, the oil volume inside the transformer voltage regulating switch remains unchanged, avoiding the situation that the oil volume inside the transformer voltage regulating switch decreases due to oil replacement, resulting in faults of the transformer voltage regulating switch. In addition, the on-line oil replacement system for the transformer voltage regulating switch provided by the present application can replace the oil when the transformer voltage regulating switch is energized, avoiding the situation of replacing the oil inside the transformer voltage regulating switch during power outage. Moreover, the on-line oil replacement system for the transformer voltage regulating switch has a simple structure, low cost, is easy to operate, and improves the efficiency of oil replacement for the transformer voltage regulating switch. Description of the Drawings

[0025] To more clearly illustrate the technical solution of the present invention, the accompanying drawings required for the description of the embodiments of the present invention will be briefly introduced below. Obviously, the accompanying drawings in the following description are only some embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, other accompanying drawings can be obtained based on these drawings.

[0026] Figure 1 It is a schematic structural diagram of an on-line oil replacement system for a transformer tap-changer provided by this application.

[0027] In the figure: 1. Oil tank, 2. Oil bladder, 3. Transformer tap-changer, 4. First pipeline, 5. Oil bladder inlet oil pump, 6. Second pipeline, 7. Oil tank drain oil pump, 8. Oil quality monitoring device, 9. Lifting lug, 10. Control device, 10-1. Computer, 10-2. Oil pump driver, 10-3. Weighing device, 10-4. Liquid level gauge. Specific embodiments

[0028] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, rather than all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts belong to the scope of protection of the present invention.

[0029] This application provides an on-line oil replacement system for a transformer tap-changer. It will be described in detail in the following embodiments. The following is combined with Figure 1 The on-line oil replacement system for a transformer tap-changer provided by the embodiments of this application is described. Figure 1 A schematic structural diagram of the on-line oil replacement system for a transformer tap-changer is shown. The on-line oil replacement system for a transformer tap-changer of this application includes an oil tank 1 with an internal oil bladder 2, an oil tank drain oil pump 7, an oil bladder inlet oil pump 5, a weighing device 10 for weighing the oil tank 1, and a control device 10. The inlet of the oil bladder 2 is connected to the drain port of the transformer tap-changer 3 through a first pipeline 4. The oil bladder inlet oil pump 5 is installed on the first pipeline and is used to inject the waste oil inside the transformer tap-changer 3 into the oil bladder 2 through the first pipeline 4. The space between the oil tank 1 and the oil bladder 2 is used to store qualified oil. There is an oil tank drain port at the top of the oil tank 1. The oil tank drain port is connected to the inlet of the transformer tap-changer 3 through a second pipeline 6. The oil tank drain oil pump 7 is installed on the second pipeline and is used to inject the qualified oil inside the oil tank 1 into the transformer tap-changer 3.

[0030] In the embodiment of the present application, the control device 10 includes a computer 10-1, an oil pump driver 10-2, and a weighing device 10-3. The weighing device 10-3 is respectively connected to the fuel tank 1 and the computer 10-1. The computer can be an MCU or a single-chip microcomputer with computing functions, or a chip of various operating systems, such as an x86, ARM, or IOS system chip. The weighing device 10-3 is used to measure the weight of the fuel tank 1 in real time and send the measured weight signal to the computer 10-1. The oil pump driver 10-2 is respectively connected to the computer 10-1 and the fuel tank drain pump 7. The computer 10-1 sends a control signal to the oil pump driver 10-2 according to the weight signal. The oil pump driver 10-2 controls the flow rate of the fuel tank drain pump 7 according to the control signal. If the fuel tank drain pump 7 does not have a solenoid valve, a solenoid valve can be added to the pipeline to realize the adjustment of the opening degree, so that the difference between the weight of the fuel tank 1 and the initial weight of the fuel tank 1 is less than a preset threshold. Among them, the threshold is not limited to the following: 3, 5, 10, 20, 30, 40, or 50 L. To ensure that when the difference between the weight of the fuel tank 1 and the initial weight of the fuel tank 1 is within the range of the above threshold, the change in the oil volume inside the transformer tap changer 3 is within a safe range, and the transformer tap changer 3 will not malfunction due to the change in the oil volume. For example, within a range of 10 L, the range can be set to ±1 L, that is, between 9 L and 11 L.

[0031] In addition, during specific implementation, a liquid level gauge 10-4 can also be installed inside the transformer tap changer 3 and connected to the computer 10-1 to measure the liquid level height of the insulating oil inside the transformer tap changer 3 and send the measured height signal to the computer 10-1. The computer 10-1 analyzes the volume according to the height signal and then sends a control signal to the oil pump driver 10-2. The oil pump driver 10-2 controls the flow rate opening of the fuel tank drain pump 7 according to the control signal to keep the liquid level height of the insulating oil inside the transformer tap changer 3 within a preset height range. When the oil volume in the transformer tap changer 3 is higher than the reference and shows an upward trend, and the weight of the fuel tank 1 is less than the initial weight set for the fuel tank 1, such as the weight of 30 L of qualified oil, and the initial weight is set to 29 L; the computer 10-1 sends a control signal to the oil pump driver 10-2 to reduce the flow rate of the fuel tank drain pump 7, and the flow rate and velocity of the waste oil recovered by the oil bladder remain unchanged until the oil volume in the transformer tap changer 3 shows a downward trend and the difference between the weight of the fuel tank 1 and the initial weight of the fuel tank 1 is within the preset threshold range;

[0032] When the oil level of the transformer voltage regulating switch 3 is lower than the reference level and shows an upward trend, and the current weight of the fuel tank 1 is greater than the initial weight set for the fuel tank 1, such as the weight of 30L of qualified oil, with the initial weight set to 29L; the computer 10-1 sends a control signal to the oil pump driver 10-2 to increase the flow rate of the fuel tank drain pump 7, and the flow rate and velocity of the waste oil recovered by the oil bladder remain unchanged until the oil level of the transformer voltage regulating switch 3 shows a downward trend and the difference between the weight of the fuel tank 1 and the initial weight of the fuel tank 1 is within the preset threshold range, thereby ensuring that the change in the oil level inside the transformer voltage regulating switch 3 is within a safe range and the transformer voltage regulating switch 3 will not malfunction due to the change in the oil level.

[0033] It should be noted that preferably, in the embodiment, it is also possible to only consider the difference between the current weight of the fuel tank 1 and the initial weight set for the fuel tank to achieve control. For example: when the current weight of the fuel tank 1 is less than the initial weight set for the fuel tank, the computer 10-1 sends a control signal to the oil pump driver 10-2 to reduce the flow rate of the fuel tank drain pump 7, while the flow rate / velocity of the waste oil recovered by the oil bladder remains unchanged, so that the weight of the fuel tank 1 slowly increases or remains unchanged, and thus the difference between the weight of the fuel tank 1 and the initial weight of the fuel tank 1 is within the preset threshold range.

[0034] For example: when the current weight of the fuel tank 1 is greater than the initial weight set for the fuel tank 1, the computer 10-1 sends a control signal to the oil pump driver 10-2 to increase the flow rate of the fuel tank drain pump 7, so that the weight of the fuel tank 1 slowly decreases, and thus the difference between the weight of the fuel tank 1 and the initial weight of the fuel tank 1 is within the preset threshold range.

[0035] Vice versa, when the current weight of the fuel tank 1 is less than the initial weight set for the fuel tank 1, the computer 10-1 sends a control signal to the oil pump driver 10-2 to reduce the flow rate of the fuel tank drain pump 7, so that the weight of the fuel tank 1 slowly increases, and thus the difference between the weight of the fuel tank 1 and the initial weight of the fuel tank 1 is within the preset threshold range.

[0036] In specific implementation, a lifting lug 9 is provided at the upper part of the fuel tank 1. The lifting lug 9 suspends the fuel tank 1 on a bracket (not shown) for fixing the transformer voltage regulating switch 3. The weighing device 10-3 is installed on the lifting lug 9 to measure the weight of the fuel tank and send the measured weight signal to the computer 10-1 in real time to achieve real-time monitoring of the weight of the fuel tank.

[0037] In the embodiment of the present application, the on-line oil replacement system for the transformer voltage regulating switch further includes an oil quality monitoring device 8. The oil quality monitoring device 8 is installed inside the transformer voltage regulating switch 3 and connected to the computer 10-1 to monitor the quality of the oil inside the transformer voltage regulating switch 3 in real time, and send the monitored oil quality signal to the computer 10-1, so that the computer 10-1 controls the start or stop of the tank oil drain pump 7 and the oil bladder inlet pump 5 according to the oil quality signal.

[0038] Preferably, the system may further include using the computer components in the system to establish historical data among the quality of the current oil product inside the transformer voltage regulating switch, the quality of the qualified oil product inside the transformer voltage regulating switch, the number of switch operations, and the replacement duration each time the insulating oil of the voltage regulating switch is replaced, and determine the volume of the qualified oil contained in the tank;

[0039] When it is necessary to replace the oil inside the transformer voltage regulating switch, display the volume of the qualified oil required.

[0040] Different weights can be set for the above 4 important indicators. Usually, the number of switch operations and the quality of the current oil product should account for more than half of the weights. With such a ratio, the estimated volume of the qualified oil required is more accurate, and after replacement, it is closer to the actual consumption of the qualified oil. For example:

[0041] The sum of the weights of A (quality of the current oil product), B (quality of the qualified oil product inside the transformer voltage regulating switch), C (number of switch operations), and D (replacement duration in days) is ≤1. ABCD are the respective weights. And the sum of C and B is at least >0.5, and can also be in the range of 0.5 to 0.8, otherwise it will affect the accuracy of the replaced oil volume. The sum of each weight is ≤1.

[0042] The weights A / B can respectively represent different grades of oil quality, such as grade one is 0.2, grade two is 0.1, etc.; C is the grade for different intervals of the number of switch operations, such as adding 0.1 for 1000 times, and so on; D is adding 0.1 weight every 6 months.

[0043] The total weight X the maximum volume V1 of the tank is the volume V2 of the qualified oil carried. Determining the volume V2 of the qualified oil contained in the tank during each replacement process includes: V2 = [A + B + C + D]V1.

[0044] During each replacement, due to various factors such as the duration of replacement, the number of switch operations, and the load, the volume of qualified oil carried each time is different. If the maximum volume is carried each time, it will cause waste. Through the above historical data analysis, the general volume range of qualified oil carried is 2 to 5 times the current internal volume of the switch. Usually, 5 times is used as the volume of the fuel tank for use. For example, if the regulating switch stores 30 liters of oil, a 150-liter fuel tank with an inflatable oil bladder can be selected as the fuel tank for subsequent use. The volume of qualified oil carried each time can be calculated according to the formula: total weight × maximum volume of the fuel tank 150L, which is the volume of qualified oil carried. Thus, the most accurate oil volume can be carried, avoiding the phenomenon of excessive insulating oil carried and waste.

[0045] Taking the actual situation of a specific regulating switch as an example, the current oil quality of the regulating switch is grade two, the weight of A is 0.1, the oil quality of the qualified oil in the transformer regulating switch is grade one, the weight of B is 0.2, the number of switch operations is 2300 times, the weight of C is 0.2, the operation duration is 7 months, and the weight of D is 0.1. The qualified oil required for the final oil barrel this time is: V2 = 150L×0.7 = 105L of qualified oil.

[0046] The embodiment of the present application also provides a method for online replacement of transformer regulating switch oil, including the above online replacement system of transformer regulating switch oil, which realizes automatic online replacement of transformer regulating switch oil, and has the characteristics of high precision, high degree of automation, and strong stability.

[0047] As mentioned above, the above are only specific embodiments of the present invention, but the protection scope of the present invention is not limited thereto. Any person skilled in the art within the technical scope disclosed by the present invention can easily think of changes or substitutions, which should all be covered within the protection scope of the present invention. Therefore, the protection scope of the present invention should be subject to the protection scope of the claims.

Claims

1. An on-line replacement system for the oil of a transformer voltage regulating switch, characterized in that, Comprising: A fuel tank with an oil bladder built-in, a fuel tank drain pump, an oil bladder inlet pump, and a control device for weighing the fuel tank; The inlet of the oil bladder is connected to the drain port of the transformer voltage regulator switch through a first pipeline, and the oil bladder inlet pump is installed on the first pipeline for injecting the waste oil inside the transformer voltage regulator switch into the oil bladder through the first pipeline; The space between the fuel tank and the oil bladder is used to store qualified oil for the first use. A fuel tank drain port is provided at the top of the fuel tank. The fuel tank drain port is connected to the inlet of the transformer voltage regulator switch through a second pipeline, and the fuel tank drain pump is installed on the second pipeline for injecting the qualified oil inside the fuel tank into the transformer voltage regulator switch; The control device includes a computer, a pump driver, and a weighing device. The weighing device is respectively connected to the fuel tank and the computer, and the weighing device is used to measure the weight of the fuel tank in real time and send the measured weight signal to the computer; The pump driver is respectively connected to the computer, the fuel tank drain pump, and the second pipeline. The computer sends a control signal to the pump driver according to the weight signal, and the pump driver controls the flow rate of the fuel tank drain pump according to the control signal so that the difference between the weight of the fuel tank and the initial weight of the fuel tank is within the range of a preset threshold; 2. The on-line replacement system for transformer tap changer oil according to claim 1, characterized in that, The control device further includes: a liquid level gauge installed inside the transformer voltage regulator switch and connected to the computer; wherein, The computer sends a control signal to the pump driver according to the weight signal, and the pump driver controls the flow rate of the fuel tank drain pump according to the control signal so that the difference between the weight of the fuel tank and the initial weight of the fuel tank is within the range of a preset threshold, including: When the liquid level gauge measures that the oil volume in the transformer voltage regulator switch is higher than the reference and shows an upward trend, and the current weight of the fuel tank is less than the initial weight set for the fuel tank, the computer sends a control signal to the pump driver to reduce the flow rate of the fuel tank drain pump until the oil volume in the transformer voltage regulator switch shows a downward trend and the difference between the weight of the fuel tank and the initial weight of the fuel tank is within the range of a preset threshold; Or, when the liquid level gauge measures that the oil volume in the transformer voltage regulator switch is lower than the reference and shows a downward trend, and the weight of the fuel tank is greater than the initial weight set for the fuel tank, the computer sends a control signal to the pump driver to increase the flow rate of the fuel tank drain pump until the oil volume in the transformer voltage regulator switch shows an upward trend and the difference between the weight of the fuel tank and the initial weight of the fuel tank is within the range of a preset threshold; 3. The on-line replacement system for the oil of the transformer voltage regulating switch according to claim 2, wherein, Further comprising: An oil quality monitoring device, which is installed inside the transformer voltage regulator switch and connected to the computer to monitor the oil quality inside the transformer voltage regulator switch in real time, and send the monitored oil quality signal to the control device for the oil quality monitoring device to control the start or stop of the fuel tank drain pump and the oil bladder inlet pump according to the oil quality signal.

4. The on-line replacement system for the oil of the transformer voltage regulating switch according to claim 1, wherein It further includes a lifting lug installed on the upper part of the fuel tank, which is used to hang the fuel tank on a bracket for fixing the tap-changer of the transformer; The weighing device is installed on the lifting lug and is used to measure the weight of the fuel tank and send the measured weight signal to the computer in real time.

5. The on-line replacement system for the oil of the transformer voltage regulating switch according to claim 3, characterized in that, Establish historical data among the quality of the oil in the tap-changer of the transformer, the quality of the qualified oil in the tap-changer of the transformer, the number of switching operations, and the replacement duration, and determine the volume of the qualified oil contained in the fuel tank during each replacement process; When it is necessary to replace the oil in the tap-changer of the transformer, display the volume of the qualified oil required.

6. The on-line replacement system for transformer voltage regulating switch oil according to claim 5, characterized in that, The volume V1 of the fuel tank is 5 times the volume of the oil in the tap-changer of the transformer; The determination of the volume V2 of the qualified oil contained in the fuel tank during each replacement process includes: V2 = (A + B + C + D)V1 A is the weight of the quality of the current oil, B is the weight of the quality of the qualified oil in the tap-changer of the transformer, C is the weight of the number of switching operations, and D is the weight of the replacement duration.

7. An on-line replacement method for the oil of a transformer voltage regulating switch, characterized in that, Use the on-line oil replacement system for the tap-changer of the transformer according to any one of claims 1-6 to replace the oil in the tap-changer of the transformer on-line.

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