Transformer oil compatibility and aging test device and method

Abstract

A transformer oil compatibility and aging test device comprises an aging box, a reagent bottle, an adapter for sealing the mouth of the reagent bottle, an air inlet duct that seals and passes through the adapter to enter the reagent bottle, and an air outlet duct that is sealed and connected to the adapter and can lead out the gas in the reagent bottle. The reagent bottle is filled with solid insulating materials and transformer oil that immerses the fixed insulating materials. The reagent bottle is placed in an aging box for testing. The present invention achieves good pressure balance of the test device. Only ordinary glass reagent bottles and ordinary ovens are needed as aging boxes for testing. The test device is simple, low in cost, easy to assemble and clean. The test and sampling processes are combined into one, avoiding the risks of moisture absorption and secondary pollution caused by the cumbersome sampling process. The transformer oil aging and compatibility test is more operable, the test process is simpler, the safety is higher, and the cost is lower. The present invention also provides a transformer oil compatibility and aging test method.

Description

Technical Field

[0001] The invention relates to a transformer oil compatibility and aging test device and method, which are used for the compatibility of transformer oil and other solid insulating materials and the aging test of the insulating system. Background Art

[0002] Transformer oil is an important liquid insulating medium in the power system. In actual operation, transformer oil and other solid insulating materials form the transformer insulation system, which plays the role of insulation, cooling and arc extinguishing during operation. Therefore, exploring the compatibility of transformer oil and other solid insulating materials and the aging of the insulation system is of great significance to ensure the safe and reliable operation of the transformer.

[0003] According to the relevant standards, high temperature and nitrogen protection are required during the test. At high temperatures, the oil will expand and release small molecular gases. Therefore, the test device is required to have a certain heat resistance and pressure bearing or pressure relief capabilities. At the same time, during the high-temperature accelerated aging test, transformer oil is prone to form oxidation products such as sludge and sediment, which makes it difficult to clean the test device and easily causes secondary pollution. In addition, the oil is easy to absorb moisture when it comes into contact with air during the sampling process, resulting in inaccurate test results. CN201610720505.4 A test device and test method. This patent proposes a matching aging test device and method for a solid-liquid mixed insulating material system. This patent can meet the basic requirements of the transformer oil test standard, but the test device contains a complex vacuum system, a pressurization system, a customized high-temperature box, a control system and a pressure relief system, and the operation is cumbersome (at least three people are required to operate simultaneously during the test). At the same time, the aging chamber and the pipeline are both non-detachable stainless steel materials that are difficult to clean, and the oil pipeline is immersed in the aging insulating liquid for a long time, which is easy to deposit sludge and other oxidation products. It cannot be replaced, which is easy to cause cross contamination of samples. The sampling process is cumbersome and the sampling device is only a small-capacity syringe, which is difficult to meet the pollution-free sampling requirements of large sample volume tests, and it is also impossible to collect the gas released by the oil during the aging process. In addition, the equipment is expensive, has poor function expansion and mobility, and cannot meet the needs of large-scale tests at the same time. Summary of the invention

[0004] The transformer oil compatibility and aging test device and method provided by the present invention ensure that the pressure inside and outside the reagent bottle is equal during the aging test, and achieve good pressure balance of the test device. The test can be carried out by using ordinary glass reagent bottles and ordinary ovens as aging boxes. The test device is simple, easy to assemble and clean, and the test and sampling processes are combined into one, avoiding the risks of moisture absorption and secondary pollution caused by the cumbersome sampling process. The transformer oil aging and compatibility test has higher operability, a simpler test process, higher safety, and a simple test device, low cost and higher safety.

[0005] In order to achieve the above object, the technical solution adopted by the present invention is:

[0006] The transformer oil compatibility and aging test device is characterized by comprising an aging box capable of heating and heat preservation, a reagent bottle, an adapter for sealing the mouth of the reagent bottle, an air inlet duct which is sealed and passes through the adapter to pass into the reagent bottle, and an air outlet duct which is sealed and connected to the adapter and can lead out the gas in the reagent bottle, the reagent bottle is filled with solid insulating material and transformer oil for immersing the fixed insulating material, and the reagent bottle is placed in the aging box for testing.

[0007] Preferably, the inner end of the air inlet conduit is introduced into the transformer oil, and the outer end is connected to a one-way valve, and the one-way valve is connected to a nitrogen gas collecting bottle through a conduit.

[0008] Preferably, the inner end of the air outlet conduit is sealedly connected to the connecting port of the adapter, and the outer end is connected to the second one-way valve.

[0009] Preferably, it also includes a gas collector, which can be connected to the one-way valve 2 to collect the gas discharged from the reagent bottle during the test.

[0010] The transformer oil compatibility and aging test method uses the transformer oil compatibility and aging test device described above. The test steps are as follows:

[0011] S1: Put solid insulating material and transformer oil into a reagent bottle, the transformer oil is not enough to cover the solid insulating material, seal the air inlet duct, the air outlet duct and the adapter, and then install the adapter at the mouth of the reagent bottle;

[0012] S2: Connect the outer end of the air inlet conduit to the nitrogen gas collecting bottle, input nitrogen into the reagent bottle, and exhaust all the air in the reagent bottle from the air outlet conduit;

[0013] S3: Stop inputting nitrogen and disconnect the air inlet duct and the air outlet duct, put the reagent bottle into the aging box, and extend the air inlet duct and the air outlet duct out of the aging box;

[0014] S4: Set the test temperature and time of the aging box and start the aging box, and at the same time open the air outlet duct;

[0015] S5: When the test time is up, take out the reagent bottle from the aging box, remove the adapter and quickly put the cap on the reagent bottle to complete the test.

[0016] Preferably, "disconnecting the air inlet duct and the air outlet duct" in step S3 means disconnecting the air inlet duct by rotating the one-way valve 1 and disconnecting the air outlet duct by rotating the one-way valve 2.

[0017] Preferably, before completing step S3 and proceeding to step S4, a gas collector is connected to the one-way valve 2 to collect the gas discharged from the reagent bottle during the test.

[0018] The beneficial effects of the invention are:

[0019] 1. The transformer oil compatibility and aging test device of the present invention comprises: solid insulating material and transformer oil are placed in a reagent bottle; a transfer joint seals the mouth of the reagent bottle and connects an air inlet duct and an air outlet duct; before the test, the air inlet duct is connected to a nitrogen gas collecting bottle, nitrogen is input into the reagent bottle, the air in the reagent bottle is discharged from the air outlet duct, nitrogen is filled into the reagent bottle so that the test is carried out under nitrogen protection; during the test, gas is discharged through the air outlet duct to relieve the pressure of the reagent bottle, so that the pressure inside and outside the reagent bottle are equal during the aging test, and good pressure balance of the test device is achieved; The test can be carried out by using ordinary glass reagent bottles and ordinary ovens as aging boxes. After the test is completed, the oil sample to be tested is formed in the reagent bottle. There is no need to take samples separately. The subsequent test can be carried out by directly pouring out the supernatant oil from the reagent bottle. The test device is simple, easy to assemble and clean. The test and sampling processes are combined into one, avoiding the risks of moisture absorption and secondary pollution caused by the cumbersome sampling process. The transformer oil aging and compatibility test is more operational, the test process is simpler, and the safety is higher. The test device is simple, low-cost and safer.

[0020] 2. The air inlet duct is connected to the nitrogen gas collecting bottle to provide protective gas - nitrogen. The exhaust duct is used for nitrogen purging before the test and gas discharge during the test to maintain pressure balance. The reagent bottle is used to hold the transformer oil and other solid insulating materials used in the test. The glass material is conducive to cleaning oxidation products such as sludge precipitation. It is also convenient to check the appearance and preliminarily judge the aging status. The adapter is mainly used to connect the reagent bottle, exhaust duct and air inlet duct and ensure air tightness. The one-way valve 1 is used to close and conduct the air inlet duct, and the one-way valve 2 is used to close and conduct the air outlet duct. The gas collector is used to collect the gas discharged from the reagent bottle during the test for subsequent analysis and detection, making the transformer oil aging and compatibility test simpler, easier to operate and safer. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 Schematic diagram of a transformer oil compatibility and aging test device in a specific implementation manner. DETAILED DESCRIPTION

[0022] Combine the following Figure 1 The embodiments of the present invention are described in detail.

[0023] The transformer oil compatibility and aging test device is characterized by comprising an aging box 1 that can heat and keep warm, a reagent bottle 2, an adapter 3 that seals the mouth of the reagent bottle 2, an air inlet duct 4 that seals and passes through the adapter 3 and passes into the reagent bottle 2, and an air outlet duct 5 that is sealed and connected to the adapter 3 and can lead out the gas in the reagent bottle. The reagent bottle 2 is filled with solid insulating material and transformer oil that immerses the fixed insulating material. The reagent bottle 2 is placed in the aging box 1 for testing.

[0024] In the transformer oil compatibility and aging test device described above, solid insulating materials and transformer oil are placed in a reagent bottle 2, and an adapter 3 seals the mouth of the reagent bottle 2 and connects the air inlet duct 4 and the air outlet duct 5. An adapter with good compatibility with transformer oil should be used to avoid the adapter reacting with the transformer oil during the test and affecting the composition of the oil in the reagent bottle. Before the test, the air inlet duct 4 is connected to the nitrogen gas collecting bottle, and nitrogen is input into the reagent bottle 2 so that the air in the reagent bottle 2 is discharged from the air outlet duct 5. Nitrogen is filled into the reagent bottle 2 so that the test is carried out under nitrogen protection. During the test, the gas is discharged through the air outlet duct 5 to relieve the pressure on the reagent bottle 2 to ensure that the test is carried out during the aging test. The pressure inside and outside the reagent bottle 2 is equal, so a good pressure balance of the test device is achieved. The test can be carried out by only using a reagent bottle 2 made of ordinary glass and an ordinary oven as an aging box, which effectively reduces the cost of the test device. After the test is completed, the oil sample to be tested is formed in the reagent bottle 2, and no additional sampling is required. The supernatant oil can be directly poured out from the reagent bottle 2 for subsequent testing. The test device is simple, easy to assemble and clean, and the test and sampling processes are combined into one, avoiding the risks of moisture absorption and secondary pollution caused by the cumbersome sampling process. The transformer oil aging and compatibility test is more operable, the test process is simpler, and the safety is higher. The test device is simple, low-cost and safer.

[0025] The inner end of the air inlet conduit 4 is passed into the transformer oil, and the outer end is connected to a one-way valve 6, which is connected to a nitrogen gas collecting bottle 7 through a conduit. The one-way valve 6 is used to close and conduct the air inlet conduit 4. Before the test, nitrogen is passed into the reagent bottle 2 and purged for a period of time to ensure that the air in the transformer oil and the air in the reagent bottle 2 are completely discharged from the reagent bottle 2. After the purging is completed, the nitrogen gas collecting bottle 7 and the one-way valve 6 are quickly closed, and the air outlet conduit 5 is disconnected, so that the entire test is carried out under nitrogen protection.

[0026] Among them, the inner end of the air outlet duct 5 is sealed and connected to the connection port of the adapter 3, and the outer end is connected to the one-way valve 2 8. The one-way valve 2 8 is used to close and conduct the air outlet duct 5. The air outlet duct 5 is used for nitrogen purging before the test to discharge the air in the reagent bottle 2, so that the solid insulating material and the transformer oil can be subjected to compatibility and aging tests under nitrogen protection and isolated from the air. The air outlet duct 5 is also used for gas discharge during the test process, because the transformer oil will expand due to heat during the aging test, which will squeeze the nitrogen in the reagent bottle 2. In addition, small molecular gas will escape from the oil during the test process. The gas is discharged through the air outlet duct 5 to ensure that the pressure inside and outside the reagent bottle 2 is equal during the aging test, so as to achieve good pressure balance of the test device. Only ordinary glass reagent bottles 2 and ordinary ovens are needed as aging boxes to conduct the test, which effectively reduces the cost of the test device.

[0027] It also includes a gas collector 9, which can be connected to the one-way valve 2 8 to collect the gas discharged from the reagent bottle 2 during the test. During the test, the one-way valve 2 8 is opened to conduct the gas outlet conduit 5, and the gas discharged from the reagent bottle 2 flows into the gas collector 9 through the gas outlet conduit 5 and the one-way valve 2 8. The amount of gas collected in the gas collector 9 is the amount of gas discharged during the test. The gas collector 9 collects the gas discharged from the reagent bottle during the test for subsequent analysis and detection. The head of an ordinary syringe after removing the needle can be selected as the gas collector.

[0028] The present invention also protects a transformer oil compatibility and aging test method, using the transformer oil compatibility and aging test device described above, the test steps are as follows:

[0029] S1: Put solid insulating material and transformer oil into the reagent bottle 2, the transformer oil is not enough to cover the solid insulating material, seal the air inlet duct 4, the air outlet duct 5 and the adapter 3, and then install the adapter 3 at the mouth of the reagent bottle 2;

[0030] S2: Connect the outer end of the air inlet conduit 4 to the nitrogen gas collecting bottle 7, input nitrogen into the reagent bottle 2, and completely discharge the air in the reagent bottle 2 from the air outlet conduit 5;

[0031] S3: Stop inputting nitrogen and disconnect the air inlet duct 4 and the air outlet duct 5, put the reagent bottle 5 into the aging box 1, and the air inlet duct 4 and the air outlet duct 5 extend out of the aging box 1;

[0032] S4: setting the test temperature and time of the aging box 1 and starting the aging box, while opening the air outlet duct 5;

[0033] S5: When the test time is up, take out the reagent bottle from the aging box 1, remove the adapter 3 and quickly cover the reagent bottle 2 with a bottle cap to complete the test.

[0034] The transformer oil compatibility and aging test method described above is as follows: before the test, the air inlet duct 4 is connected to the nitrogen gas collecting bottle, and nitrogen is input into the reagent bottle 2, so that the air in the reagent bottle 2 is discharged from the air outlet duct 5, and the nitrogen is filled into the reagent bottle 2 so that the test is carried out under the protection of nitrogen. During the test, the gas is discharged through the air outlet duct 5 to relieve the pressure of the reagent bottle 2, so as to ensure that the pressure inside and outside the reagent bottle 2 is equal during the aging test, and a good pressure balance of the test device is achieved. Only ordinary glass reagent bottles 2 and ordinary ovens are needed as aging boxes to carry out the test. After the test is completed, the oil sample to be tested is formed in the reagent bottle 2, and no additional sampling is required. The supernatant oil can be directly poured out from the reagent bottle 2 for subsequent testing. The test and sampling process are combined into one, avoiding the risks of moisture absorption and secondary pollution caused by the cumbersome sampling process. The transformer oil aging and compatibility test is more operable, safer, and the test process is simpler and safer.

[0035] Among them, "disconnecting the air inlet duct 4 and the air outlet duct 5" in step S3 means disconnecting the air inlet duct 4 by rotating the one-way valve 1 6, and disconnecting the air outlet duct 5 by rotating the one-way valve 2 8, so as to improve the operability of the test.

[0036] Wherein, before completing step S3 and proceeding to step S4, a gas collector 9 is connected to the one-way valve 2 8, and the gas discharged from the reagent bottle 2 during the test is collected by the gas collector 9. After the air is completely discharged from the reagent bottle, the one-way valve 2 8 is opened to conduct the gas outlet conduit 5 during the test, and the gas discharged from the reagent bottle 2 enters the gas collector 9 through the gas outlet conduit 5 and the one-way valve 2 8. The amount of gas collected in the gas collector 9 is the amount of gas discharged during the test. The gas collector 9 collects the gas discharged from the reagent bottle during the test for subsequent analysis and detection.

[0037] The above is a complete description of the technical solutions of the embodiments of the present invention in conjunction with the accompanying drawings. It should be noted that the described embodiments are only part of the embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the present invention.

Claims

1. Transformer oil compatibility and aging test method, using transformer oil compatibility and aging test device, The transformer oil compatibility and aging test device comprises an aging box capable of heating and heat preservation, a reagent bottle, an adapter for sealing the mouth of the reagent bottle, an air inlet duct which is sealed and passes through the adapter to pass into the reagent bottle, and an air outlet duct which is sealed and connected to the adapter and can lead out the gas in the reagent bottle. The reagent bottle is filled with solid insulating material and transformer oil for immersing the fixed insulating material. The reagent bottle is placed in the aging box for testing. The inner end of the air inlet conduit is passed into the transformer oil, and the outer end is connected to a one-way valve, and the one-way valve is connected to a nitrogen gas collecting bottle through a conduit; The inner end of the air outlet conduit is sealedly connected to the connecting port of the adapter, and the outer end is connected to the second one-way valve; It also includes a gas collector, which is connected to the one-way valve 2 and collects the gas discharged from the reagent bottle during the test; It is characterized in that The test steps are as follows: S1: Put solid insulating material and transformer oil into a reagent bottle, the transformer oil is not enough to cover the solid insulating material, seal the air inlet duct, the air outlet duct and the adapter, and then install the adapter at the mouth of the reagent bottle; S2: Connect the outer end of the air inlet conduit to the nitrogen gas collecting bottle, input nitrogen into the reagent bottle, and exhaust all the air in the reagent bottle from the air outlet conduit; S3: Stop inputting nitrogen and disconnect the air inlet duct and the air outlet duct, put the reagent bottle into the aging box, and extend the air inlet duct and the air outlet duct out of the aging box; S4: Set the test temperature and time of the aging box and start the aging box, and at the same time open the air outlet duct; S5: When the test time is up, take out the reagent bottle from the aging box, remove the adapter and quickly put the cap on the reagent bottle to complete the test.

2. The transformer oil compatibility and aging test method according to claim 1, characterized in that: The “disconnecting the air inlet duct and the air outlet duct” in step S3 means disconnecting the air inlet duct by rotating the one-way valve 1 and disconnecting the air outlet duct by rotating the one-way valve 2.

3. The transformer oil compatibility and aging test method according to claim 1, characterized in that: Before completing step S3 and proceeding to step S4, a gas collector is connected to the one-way valve 2 to collect the gas discharged from the reagent bottle during the test.

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