Method and device for mixing and supplementing insulating oil of power transformation equipment

Abstract

The present application relates to the technical field of transformer equipment insulating oil, and is a transformer equipment insulating oil mixing and supplementing method and device. The former is performed according to the following method: determining the insulating oil for supplementing according to the performance indexes and supplementing ratio of the insulating oil in the transformer equipment to be supplemented and the standby insulating oil; filtering the insulating oil for supplementing to obtain filtered insulating oil; performing dehydration treatment on the filtered insulating oil to obtain dehydrated insulating oil; and injecting the dehydrated insulating oil into the transformer equipment to be supplemented to complete the supplementing operation. The present application establishes a set of transformer equipment insulating oil mixing and supplementing method and device, optimizes the supplementing operation, controls the indexes such as moisture, acid value and sludge precipitation in the supplementing process of the transformer equipment, reduces the adverse effects of the existing harsh storage conditions and supplementing operation on the performance of the insulating oil, ensures the good performance of the insulating oil of the transformer equipment after supplementing, and has good popularization value.

Description

Technical Field

[0001] This invention relates to the field of insulating oil technology for power equipment, and is a method and apparatus for mixing and replenishing insulating oil for power equipment. Background Technology

[0002] Insulating oil is a mixture of hydrocarbons obtained from petroleum through distillation, clay treatment, or hydrogenation. It is a pure, stable product with low viscosity, good insulation, and good cooling properties. Transformers have long operating cycles, sometimes exceeding ten years. During long-term operation, oil levels may become insufficient, requiring the addition of insulating oil. Insulating oil mixing typically involves using oils of the same grade to ensure that the performance of the two insulating oils is not reduced after mixing, thus preventing any impact on the performance of the electrical equipment.

[0003] However, under current conditions, the spare insulating oil stored for replenishment is usually stored for a long time, and its brand or grade cannot be completely matched with the insulating oil in the power equipment. Currently, replenishment of power equipment is carried out by mixing the same grade of oil at a 1:1 ratio, which requires a comprehensive mixing test of the stored spare insulating oil to determine the insulating oil to be used for replenishment, consuming a lot of manpower and resources.

[0004] Furthermore, due to the extended storage time of the spare insulating oil, its quality can change due to variations in storage duration and environment. For example, the sludge content can reach 0.15%, the acid value can reach 0.23 mg KOH / g, and the water content can reach 80 mg / L. Water emulsifies the oil, promoting oxidation and increasing its acid value and corrosiveness. Excessive water content in insulating oil severely damages the electrical and physicochemical properties of the insulating medium, leading to a decrease in breakdown voltage, an increase in dielectric loss factor, and accelerated aging. A high acid value indicates the presence of a large amount of acidic substances, which corrodes metal components, causing corrosion, oxidation, and wear, shortening the equipment's lifespan. Sludge precipitation in the insulating oil affects the equipment's heat dissipation performance and causes severe corrosion to solid insulating materials and metals, ultimately reducing the insulating properties of the oil.

[0005] If the added insulating oil has poor performance in terms of sludge precipitation, moisture content, and acid value, it will cause the operating insulating oil to age rapidly, reducing the performance and service life of the substation equipment. Furthermore, due to limitations in manpower and resources, the current periodic testing cycle for substation equipment requiring oil replenishment and for insulating oil in storage is quite long, resulting in incomplete and inaccurate data from oil replenishment. Therefore, it is necessary to develop a method to optimize the oil replenishment operation, control indicators such as moisture content, acid value, and sludge precipitation during the oil replenishment process, reduce the adverse effects of oil replenishment on the insulating oil's performance, and avoid safety hazards. Summary of the Invention

[0006] This invention provides a method and apparatus for mixing and replenishing insulating oil in power equipment, which overcomes the shortcomings of the prior art. It can effectively solve the problem that the existing power equipment storage environment and the oil mixing operation cannot guarantee the performance of the insulating oil in the power equipment after replenishment, thus posing a safety hazard.

[0007] One of the technical solutions of the present invention is achieved through the following measures: a method for mixing and replenishing insulating oil in power equipment, comprising the following steps:

[0008] Step 1: Determine the insulating oil to be used for oiling based on the performance indicators of the insulating oil and the spare insulating oil in the substation equipment to be oiled, as well as the replenishment ratio.

[0009] Step 2: Filter the insulating oil used for oil replenishment to obtain filtered insulating oil;

[0010] Step 3: Dehydrate the filtered insulating oil to obtain dehydrated insulating oil;

[0011] Step 4: Inject the dehydrated insulating oil into the transformer equipment that needs oil replenishment to complete the oil replenishment operation.

[0012] The following are further optimizations and / or improvements to one of the above-mentioned technical solutions:

[0013] Step 1 above includes the following steps:

[0014] The first step is to calculate the pour point, sludge precipitation, and acid value of the mixed insulating oil and spare insulating oil in the transformer equipment to be replenished, according to the following formula.

[0015]

[0016] In the formula, n i The performance estimates of the insulating oil and spare insulating oil in the substation equipment to be replenished are: i represents the pour point, sludge precipitation, and acid value, respectively; p represents the performance estimates of the mixed insulating oil and spare insulating oil. i The most recent performance test value of the insulating oil in the substation equipment that needs oil replenishment; q i The most recent performance test value of the spare insulating oil is represented by i, which represents the pour point, sludge precipitation, and acid value, respectively; X represents the amount of insulating oil in the substation equipment to be replenished; Y represents the amount of insulating oil to be replenished in the substation equipment; k is a coefficient, which takes a value of -1 when i is the pour point and a value of 1 when i is the sludge precipitation and acid value.

[0017] The second step is to select n. i A superior spare insulating oil is used as the insulating oil for replenishment.

[0018] The operation in step 2 above also includes testing the acid value, breakdown voltage, and sludge precipitation value of the filtered insulating oil.

[0019] The oil filtration rate during the above oil filtration process is 20L / min to 25L / min.

[0020] Step 3 above includes: dehydrating the filtered insulating oil to obtain dehydrated insulating oil, and testing the moisture content of the dehydrated insulating oil. If the moisture content is higher than 10 mg / L, a second dehydration treatment is performed.

[0021] The above dehydration process is carried out using vacuum dehydration at a temperature of 55°C to 60°C.

[0022] The dehydration rate is 10 L / min to 15 L / min.

[0023] The second technical solution of the present invention is achieved through the following measures: an apparatus for implementing a method for replenishing mixed insulating oil in power equipment, comprising: an oil storage tank, an oil filter, a first backup storage tank, a vacuum dehydrator, a second backup storage tank, an acid value detector, a breakdown voltage detector, an oil sludge detector, and a moisture detector; a first replenishment pipeline is fixedly connected between the discharge end of the oil storage tank and the first inlet end of the oil filter; a second replenishment pipeline is fixedly connected between the discharge end of the oil filter and the inlet end of the first backup storage tank; and a third replenishment pipeline is fixedly connected between the first discharge end of the first backup storage tank and the first inlet end of the vacuum dehydrator. The vacuum dehydrator has a fourth oil replenishment line fixedly connected to the first discharge end and the second backup storage tank feed end; the second backup storage tank has a fifth oil replenishment line fixedly connected to the first discharge end; the first backup storage tank has an acid value detection line fixedly connected to the second discharge end and the acid value detector; the first backup storage tank has a breakdown voltage detection line fixedly connected to the third discharge end and the breakdown voltage detector; the first backup storage tank has a sludge detection line fixedly connected to the fourth discharge end and the sludge detector; and the second backup storage tank has a moisture detection line fixedly connected to the second discharge end and the moisture detector.

[0024] The following are further optimizations and / or improvements to the second technical solution of the above invention:

[0025] A first delivery pump is fixedly installed on the first oil replenishment pipeline, a second delivery pump is fixedly installed on the fifth oil replenishment pipeline, a first circulation pipeline is fixedly connected between the fifth discharge end of the first spare storage tank and the second feed end of the oil filter, a first circulation pump is fixedly installed on the first circulation pipeline, a second circulation pipeline is fixedly connected between the third discharge end of the second spare storage tank and the second feed end of the vacuum dehydrator, a second circulation pump is fixedly installed on the second circulation pipeline.

[0026] A third circulation pipeline is fixedly connected to the fifth oil replenishment pipeline between the second delivery pump and the second backup storage tank.

[0027] The oil filter is equipped with an exhaust port on its top.

[0028] This invention establishes a method and apparatus for replenishing mixed insulating oil in power equipment. It optimizes the replenishment operation, controls indicators such as moisture, acid value, and sludge precipitation during the replenishment process, reduces the adverse effects of existing harsh storage conditions and replenishment operations on the performance of insulating oil, and ensures the good performance of the replenished insulating oil in power equipment. The method is simple and easy to operate, and can be implemented in various environments, making it of great potential for widespread application. Attached Figure Description

[0029] Appendix Figure 1 This is a schematic diagram of Embodiment 8 of the present invention.

[0030] The codes in the attached diagram are as follows: 1 is the oil storage tank, 2 is the oil filter, 3 is the first backup storage tank, 4 is the vacuum dehydrator, 5 is the second backup storage tank, 6 is the acid value detector, 7 is the breakdown voltage detector, 8 is the sludge detector, 9 is the moisture detector, 10 is the first replenishment oil line, 11 is the second replenishment oil line, 12 is the third replenishment oil line, 13 is the fourth replenishment oil line, 14 is the fifth replenishment oil line, 15 is the acid value detection line, 16 is the breakdown voltage detection line, 17 is the sludge detection line, 18 is the moisture detection line, 19 is the first transfer pump, 20 is the second transfer pump, 21 is the first circulation line, 22 is the first circulation pump, 23 is the second circulation line, 24 is the second circulation pump, 25 is the exhaust port, and 26 is the third circulation line. Detailed Implementation

[0031] This invention is not limited to the following embodiments; specific implementation methods can be determined based on the technical solution of this invention and actual circumstances. Unless otherwise specified, all chemical reagents and chemical products mentioned in this invention are well-known and commonly used chemical reagents and chemical products in the prior art.

[0032] Unless otherwise specified, all equipment and devices used in this invention are existing and commonly known in the art.

[0033] The present invention will be further described below with reference to embodiments:

[0034] Example 1: The method for replenishing the insulating oil mixed with the transformer equipment includes the following steps:

[0035] Step 1: Determine the insulating oil to be used for oiling based on the performance indicators of the insulating oil and the spare insulating oil in the substation equipment to be oiled, as well as the replenishment ratio.

[0036] Step 2: Filter the insulating oil used for oil replenishment to obtain filtered insulating oil;

[0037] Step 3: Dehydrate the filtered insulating oil to obtain dehydrated insulating oil;

[0038] Step 4: Inject the dehydrated insulating oil into the transformer equipment that needs oil replenishment to complete the oil replenishment operation.

[0039] Example 2: As an optimization of the above example, step 1 includes the following steps:

[0040] The first step is to calculate the pour point, sludge precipitation, and acid value of the mixed insulating oil and spare insulating oil in the transformer equipment to be replenished, according to the following formula.

[0041]

[0042] In the formula, n i The performance estimates of the insulating oil and spare insulating oil in the substation equipment to be replenished are: i represents the pour point, sludge precipitation, and acid value, respectively; p represents the performance estimates of the mixed insulating oil and spare insulating oil. i The most recent performance test value of the insulating oil in the substation equipment that needs oil replenishment; q i The most recent performance test value of the spare insulating oil is represented by i, which represents the pour point, sludge precipitation, and acid value, respectively; X represents the amount of insulating oil in the substation equipment to be replenished; Y represents the amount of insulating oil to be replenished in the substation equipment; k is a coefficient, which takes a value of -1 when i is the pour point and a value of 1 when i is the sludge precipitation and acid value.

[0043] The second step is to select n. i A superior spare insulating oil is used as the insulating oil for replenishment.

[0044] Example 3: As an optimization of the above examples, step 2 includes the following operations:

[0045] The required amount of insulating oil for replenishment is taken and filtered to obtain filtered insulating oil. The acid value, breakdown voltage and sludge precipitation value of the filtered insulating oil are then tested.

[0046] Example 4: As an optimization of the above example, the oil filtration rate is 20L / min to 25L / min during the oil filtration process.

[0047] Example 5: As an optimization of the above example, step 3 includes: dehydrating the filtered insulating oil to obtain dehydrated insulating oil, and detecting the moisture content of the dehydrated insulating oil. When the moisture content is higher than 10 mg / L, a second dehydration treatment is performed.

[0048] Example 6: As an optimization of the above example, the dehydration process is carried out by vacuum dehydration at a temperature of 55°C to 60°C.

[0049] Example 7: As an optimization of the above example, the dehydration rate is 10L / min to 15L / min.

[0050] Example 8: As Figure 1As shown, the transformer equipment insulating oil mixing and replenishment device includes: an oil storage tank 1, an oil filter 2, a first backup storage tank 3, a vacuum dehydrator 4, a second backup storage tank 5, an acid value detector 6, a breakdown voltage detector 7, an oil sludge detector 8, and a moisture detector 9. A first replenishment pipeline 10 is fixedly connected between the discharge end of the oil storage tank 1 and the first inlet end of the oil filter 2. A second replenishment pipeline 11 is fixedly connected between the discharge end of the oil filter 2 and the inlet end of the first backup storage tank 3. A third replenishment pipeline 12 is fixedly connected between the first discharge end of the first backup storage tank 3 and the first inlet end of the vacuum dehydrator 4. A fourth oil replenishment line 13 is fixedly connected between the material end and the feed end of the second backup storage tank 5; a fifth oil replenishment line 14 is fixedly connected between the first discharge end of the second backup storage tank 5; an acid value detection line 15 is fixedly connected between the second discharge end of the first backup storage tank 3 and the acid value detector 6; a breakdown voltage detection line 16 is fixedly connected between the third discharge end of the first backup storage tank 3 and the breakdown voltage detector 7; a sludge detection line 17 is fixedly connected between the fourth discharge end of the first backup storage tank 3 and the sludge detector 8; and a moisture detection line 18 is fixedly connected between the second discharge end of the second backup storage tank 5 and the moisture detector 9.

[0051] Example 9: As Figure 1 As shown, as an optimization of the above embodiment, a first delivery pump 19 is fixedly installed on the first oil replenishment line 10, a second delivery pump 20 is fixedly installed on the fifth oil replenishment line 14, a first circulation line 21 is fixedly connected between the fifth discharge end of the first spare storage tank 3 and the second feed end of the oil filter 2, a first circulation pump 22 is fixedly installed on the first circulation line 21, a second circulation line 23 is fixedly connected between the third discharge end of the second spare storage tank 5 and the second feed end of the vacuum dehydrator 4, and a second circulation pump 24 is fixedly installed on the second circulation line 23.

[0052] Example 10: As Figure 1 As shown, as an optimization of the above embodiment, a third circulation pipeline 26 is fixedly connected to the fifth oil replenishment pipeline 14 between the second delivery pump 20 and the second backup storage tank 5. During the oil replenishment operation, the outlet of the fifth oil replenishment pipeline 14 is connected to the insulating oil inlet at the bottom of the substation equipment that needs oil replenishment. Insulating oil is replenished into the substation equipment through the first oil replenishment pipeline 10 to the fifth oil replenishment pipeline 14. After the oil replenishment is completed, the second backup storage tank 5 and the second delivery pump 20 are disconnected through a valve. The second delivery pump 20 and the third circulation pipeline 26 are used to circulate the insulating oil of the substation equipment, so that the replenished insulating oil is fully mixed with the original insulating oil.

[0053] Example 11: As Figure 1 As shown, as an optimization of the above embodiment, an exhaust port 25 is provided on the top of the oil filter 2.

[0054] As required, valves and instruments to ensure the normal operation of the insulating oil replenishment device for this power equipment are fixedly installed on each pipeline. The first circulation pump 22, the second circulation pump 24, the first delivery pump 19, and the second delivery pump 20 are all variable frequency pumps, whose output can be adjusted by regulating the frequency to obtain optimal operating conditions and prevent the generation of impurities such as air bubbles in the pipeline. Specifically, in this invention, the acid value detector 6 is a fully automatic acid value tester of model ZHSZ602, the breakdown voltage detector 7 is a breakdown voltage tester of model OVI80-4F, the sludge detector 8 is a sludge precipitation tester with signal RYN-3, and the moisture detector 9 is a micro-moisture meter of model JF-5.

[0055] Example 12: The method of adding insulating oil by mixing different types of insulating oil was used to replenish the insulating oil of the No. 1 main transformer at the 110kV Yaxin Substation in Urumqi, Xinjiang. The rated insulating oil capacity of the No. 1 main transformer is 18 tons, and 1.6 tons (approximately 2000L) of oil needs to be added. The specific steps are as follows:

[0056] The first step is to obtain the most recent pour point, sludge precipitation, and acid value of the substation equipment (the test value is 25 days from the oil replenishment date), and the most recent pour point, sludge precipitation, and acid value of the standby oil in the substation (the test value is 150 days from the oil replenishment date). According to Formula 1, calculate the pour point, sludge precipitation, and acid value after oil mixing, and select the standby insulating oil with the correct pour point, sludge precipitation, and acid value after oil mixing as the insulating oil to be used for oil replenishment. The results are shown in Table 1.

[0057] The second step involves injecting the insulating oil used for replenishment into the oil filter 2 to remove impurities from the insulating oil. The flow rate in the oil pipeline is 23 L / min. The acid value, breakdown voltage, and sludge precipitation value of the insulating oil in the first backup storage tank 3 are tested (see Table 1). All indicators of the treated insulating oil are improved.

[0058] The third step is to dehydrate the filtered insulating oil and then inject it into the second backup storage tank 5 to obtain dehydrated insulating oil. The moisture content of the dehydrated insulating oil in the second backup storage tank 5 is then tested.

[0059] The fourth step involves injecting the dehydrated insulating oil into the substation equipment to be replenished at a flow rate of 10 L / min, completing the replenishment operation. After replenishment, the insulating oil is circulated and mixed using the second delivery pump 20. After 48 hours, a manual sample of the insulating oil within the substation equipment is taken and compared with the data before replenishment. The insulating oil indicators after replenishment meet the requirements. Furthermore, the existing standard method GB / T 14542-2017 Transformer Maintenance and Management Guidelines is used to verify the oil quality test results after replenishment of the substation equipment in this embodiment. The verification results show that the insulating oil indicators within the substation equipment after replenishment meet the standard requirements, consistent with the results of this embodiment, indicating that the method of the present invention is accurate and reliable.

[0060] In summary, this invention optimizes the oil replenishment and mixing process for power equipment. Through simple pre-screening and oil replenishment operations, it reduces the adverse effects of existing harsh storage conditions and oil replenishment operations on the performance of insulating oil, ensuring the good performance of the insulating oil in the power equipment after oil replenishment. The method is simple and easy to operate, and can be implemented in various environments, making it of great promotional value.

[0061] The above technical features constitute the embodiments of the present invention, which have strong adaptability and implementation effect. Unnecessary technical features can be added or removed according to actual needs to meet the needs of different situations.

[0062] Table 1

[0063]

Claims

1. A method for mixing and replenishing insulating oil in power equipment, characterized in that... Includes the following steps: Step 1: Determine the insulating oil to be used for oil replenishment based on the performance indicators and replenishment ratio of the insulating oil in the substation equipment to be replenished; Step 1 includes: The first step is to calculate the pour point, sludge precipitation value, and acid value of the insulating oil and spare insulating oil mixed in the substation equipment to be replenished, according to the following formula. In the formula, n i The performance estimates of the insulating oil and spare insulating oil in the substation equipment to be replenished are: i represents the pour point, sludge precipitation value, and acid value, respectively; p represents the performance estimates of the mixed insulating oil and spare insulating oil. i The most recent performance test value of the insulating oil in the substation equipment that needs oil replenishment; q i The values ​​are the most recent performance test values ​​of the spare insulating oil, i represents the pour point, sludge precipitation value, and acid value, respectively; X represents the amount of insulating oil in the substation equipment to be replenished; Y represents the amount of insulating oil to be replenished in the substation equipment; k is a coefficient, which takes a value of -1 when i is the pour point, and a value of 1 when i is the sludge precipitation value and acid value. The second step is to select n. i A superior spare insulating oil is used as the insulating oil for replenishment; Step 2: Filter the insulating oil used for oil replenishment to obtain filtered insulating oil; Step 3: Dehydrate the filtered insulating oil to obtain dehydrated insulating oil; Step 4: Inject the dehydrated insulating oil into the transformer equipment that needs oil replenishment to complete the oil replenishment operation.

2. The method for mixing and replenishing insulating oil in power equipment according to claim 1, characterized in that... Step 2 also includes testing the acid value, breakdown voltage, and sludge precipitation value of the filtered insulating oil.

3. The method for mixing and replenishing insulating oil in power equipment according to claim 1 or 2, characterized in that... The oil filtration rate is 20L / min to 25L / min during the oil filtration process.

4. The method for mixing and replenishing insulating oil in power equipment according to claim 1 or 2, characterized in that... Step 3 includes: dehydrating the filtered insulating oil to obtain dehydrated insulating oil, and testing the moisture content of the dehydrated insulating oil. If the moisture content is higher than 10 mg / L, a second dehydration treatment is performed.

5. The method for mixing and replenishing insulating oil in power equipment according to claim 4, characterized in that... The dehydration process is carried out using vacuum dehydration at a temperature of 55°C to 60°C.

6. The method for mixing and replenishing insulating oil in power equipment according to claim 4, characterized in that... The dehydration rate is 10 L / min to 15 L / min.

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