Automatic oil injection device and method for detecting breakdown voltage of insulating oil

Abstract

The invention discloses an automatic oil injection device and method for insulating oil breakdown voltage detection, and relates to the technical field of insulating oil detection.The automatic oil injection device comprises an oil injection assembly, a breakdown voltage detection assembly, a temperature measurement and control module and an automatic oil injection module, and the oil injection assembly comprises an oil injection module, an oil cup and an insulating oil liquid level control module; the breakdown voltage detection assembly comprises a to-be-detected oil sample volumetric flask, a filtering module, a first peristaltic pump and a breakdown voltage tester; the temperature measurement and control assembly comprises an oil temperature measurement module and a temperature control module; according to the invention, the traditional manual removal time is shortened, the injector is not easy to damage, the risk of cutting a detector is also avoided, and dangerous factors are reduced in the detection process.

Description

Technical Field

[0001] The present invention relates to the technical field of insulating oil detection, in particular to an automatic oil filling device and method for insulating oil breakdown voltage detection, and is used for the operation of insulating oil breakdown voltage detection oil sample. Background Art

[0002] Substation equipment refers to the equipment used in power systems to transform voltage, receive and distribute electrical energy, control power flow, and regulate voltage. This equipment primarily includes transformers, switches, four-component devices, and reactive power devices. It also includes auxiliary devices such as surge arresters, insulators, high-voltage bushings, conductors, grounding devices, secondary equipment, and high-voltage DC equipment. Transformers are a common type of electrical equipment used to convert an alternating voltage of a certain value to an alternating voltage of the same frequency. They can also change the value of AC power, transform impedance, or alter phase or frequency.

[0003] The primary functions of insulating oil in a transformer include insulation, cooling, and arc extinguishing. Insulating oil fills gaps within the transformer, expels air, and prevents moisture and humidity from entering, thereby enhancing the transformer's insulation performance. Insulating oil has a greater dielectric strength than air and effectively protects the solid insulation material within the transformer, preventing the generation and spread of arcs. Transformers generate significant heat during operation. The insulating oil circulates, transferring heat to the heat sink, thereby maintaining the transformer's temperature within a safe range. Insulating oil has a high specific heat capacity, effectively absorbing and transferring heat, ensuring the proper operation of the transformer. At high temperatures, insulating oil decomposes to produce a large amount of gas, which creates a high pressure that helps quickly extinguish arcs and ensures reliable equipment operation.

[0004] Testing the insulation oil breakdown voltage is the first line of defense in the insulation management of oil-filled equipment. It combines technical safety with economic value and is crucial to the stable operation of power systems. High-voltage equipment (such as transformers, circuit breakers, and cables) relies on insulating oil as its primary insulating medium. Testing can prevent sudden failures caused by oil deterioration. The breakdown voltage directly reflects the insulating oil's ability to withstand electric field strength. Contaminants such as moisture, particulate matter, and dissolved gases can significantly reduce the breakdown voltage. After long-term operation, the accumulation of acidic or colloidal substances in the oil can lead to a decline in insulation performance. Breakdown voltage testing can promptly detect aging trends. If the voltage is too low, the oil gap may break down, causing serious accidents such as equipment short circuits and arcing. The typical method uses a flat electrode method (with a spacing of 2.5mm). Under standard conditions, the voltage is gradually increased until the oil sample breaks down, and the average of multiple measurements is taken.

[0005] During the insulating oil breakdown voltage test, the insulating oil retrieved from the site needs to be placed at room temperature before testing begins, and the instrument's detection module needs to be rinsed multiple times. During the test, to prevent electric shock, the entire process must be carried out on an insulating pad. The degree of pretreatment of the insulating oil breakdown voltage test oil sample, whether the detection module is rinsed thoroughly, and the amount of oil injected have a significant impact on the test results. The tester cannot ensure that the oil injection value is the standard value for each test. If they rely solely on experience to inject oil, the inconsistent manual oil injection speed will cause bubbles to remain in the oil, causing some test results to be very discrete, and even affecting the test results. Since the oil sample cannot be repeatedly tested for breakdown voltage, it can only be resampled and retested. The electrodes need to be cleaned between each test, which reduces test efficiency, wastes a lot of manpower and material resources, and the authenticity and accuracy of the test results cannot be guaranteed.

[0006] In the prior art, China's authorized patent announcement number: CN 119780389 A discloses a mobile laboratory system for automated testing of insulating oil in State Grid transformers, comprising: a mobile laboratory body that is freely movable; a conveyor line for conveying insulating oil samples, wherein the conveyor line passes through an oil sample testing device and a manual operation table, and forms a reciprocating loop; an oil sample testing device for automatically testing insulating oil samples; a manual operation table for testing insulating oil samples that the oil sample testing device cannot automatically test; the conveyor line, the oil sample testing device, and the manual operation table are all disposed within the mobile laboratory body. By providing a freely movable mobile laboratory body and the oil sample testing device and manual operation table disposed therein, the present invention can perform testing immediately at the insulating oil sampling site, freeing the automated testing experiment of transformer insulating oil from geographical, temperature, and environmental limitations. Summary of the Invention

[0007] The technical problem to be solved by the present invention is to address the deficiencies of the existing technology and disclose an automatic oil filling device and method for insulating oil breakdown voltage detection; and solve the influence of manual operation on oil sampling for insulating oil breakdown voltage detection.

[0008] To achieve the above objectives, the present invention is implemented through the following technical solutions: an automatic oil filling device and method for detecting the breakdown voltage of insulating oil; used for the operation of detecting the breakdown voltage of insulating oil and oil samples, comprising: an oil injection component, a breakdown voltage detection component, a temperature measurement and control module, and an automatic oil filling module;

[0009] The oil injection assembly includes an oil injection module, an oil cup and an insulating oil level control module;

[0010] The oil injection module is placed inside the oil cup, and the insulating oil level control module is fixedly mounted on the upper end of the inner wall of the oil cup;

[0011] The breakdown voltage detection assembly includes a volumetric bottle of oil sample to be tested, a filter module, a first peristaltic pump, and a breakdown voltage tester;

[0012] The filter module for filtering impurities is placed inside the oil sample volumetric bottle, one end of the filter module is fixedly connected to the first oil pipeline and the first valve and one end of the first peristaltic pump, and the other end of the first peristaltic pump is fixedly connected to the breakdown voltage tester through the second oil pipeline and the second valve;

[0013] The temperature measurement and control component includes an oil temperature measurement module and a temperature control module;

[0014] The oil temperature measuring module is fixedly mounted on the lower end of the filter module, and the temperature control module is fixedly connected to the other end of the first peristaltic pump;

[0015] Further:

[0016] The oil injection assembly and the temperature measurement and control module are fixedly connected to one end of the second peristaltic pump through a third valve and a first flushing oil delivery pipeline, and the other end of the second peristaltic pump is connected to the flushing oil storage tank through a fourth valve.

[0017] Further:

[0018] The capacity of the oil sample volumetric flask to be tested is 500ml or 1000ml;

[0019] The first oil pipeline, the second oil pipeline, the first flushing oil pipeline and the second flushing oil pipeline are all made of stainless steel;

[0020] The first peristaltic pump and the second peristaltic pump are variable frequency self-priming pumps and micro pumps with an accuracy of ±0.2ml;

[0021] The first valve, the second valve, the third valve and the fourth valve are all one-way valves;

[0022] The volume of the flushing oil storage tank is 5L;

[0023] The inner volume of the oil cup is 300 ml.

[0024] An automatic oil filling method for detecting the breakdown voltage of insulating oil is carried out according to the following steps:

[0025] Step (1), fixedly connecting the automatic oil filling device for insulating oil breakdown voltage detection with the oil sample to be tested and the breakdown voltage tester;

[0026] Step (2), start the first peristaltic pump, open the first valve and the second valve, and allow the insulating oil to be tested to clean the oil cup in the breakdown voltage tester for 3-5 seconds through the oil spray module; start the second peristaltic pump, open the third valve and the fourth valve, and discharge the flushing oil through the second flushing oil delivery pipeline to the flushing oil storage tank;

[0027] Step (3), adjusting the flow rate of the first peristaltic pump, injecting the oil sample to be tested into the oil cup in the breakdown voltage tester, controlling the oil injection amount through the insulating oil level control module, stopping the first peristaltic pump after reaching the set oil amount, and closing the first valve and the second valve;

[0028] In step (4), while the oil sample to be tested is injected into the oil cup, the oil temperature measuring module detects the temperature of the injected oil sample in real time, the temperature control device controls the temperature of the oil sample, and simultaneously starts the breakdown voltage tester (11) to test the breakdown voltage of the oil sample to be tested.

[0029] Further:

[0030] In step (2), the nozzle portion of the oil injection module adopts a shower head design with a 150° angle;

[0031] The flow rate of the oil injection module when flushing the oil cup is 20 ml / s; the flushing time of the oil cup is 3s-5s;

[0032] The filter module (2) filters particulate impurities larger than 5 microns.

[0033] Further:

[0034] In the step (3), the second peristaltic pump delivers the flushing waste oil to the flushing oil storage tank (19) at a delivery rate of 20 ml / s;

[0035] In step (3), the liquid level control module is interlocked with the first peristaltic pump, and the oil filling operation is automatically stopped when the set oil level is reached.

[0036] Further:

[0037] In step (4), the temperature of the oil sample to be tested and the ambient temperature are measured by a temperature control device connected to the second oil pipeline to adjust the oil temperature; the temperature control device controls the difference between the oil sample temperature and the ambient temperature to be within ±1.0°C;

[0038] In step (4), the oil injection by the first peristaltic pump is divided into two stages: rapid oil injection and fine oil injection. The flow rate of the rapid oil injection stage is 30 ml / s, and the flow rate of the fine oil injection is 0.5 ml / s. When the oil injection reaches 90% of the set oil sample, the fine oil injection is used;

[0039] The set oil volume is 250ml;

[0040] In the step (4), the oil sample to be tested is tested by the breakdown voltage tester, and each oil sample is tested 6 times and the arithmetic average is taken as the test value.

[0041] Compared with the prior art, the present invention has the following beneficial effects:

[0042] The present invention discloses an automatic oil filling device and method for insulating oil breakdown voltage detection. The device and method utilize an oil spraying component, a breakdown voltage detection component, a temperature measurement and control module, and an automatic oil filling module to solve the problem of manual processing of oil samples for insulating oil breakdown voltage detection, shorten the insulating oil detection time, and avoid the discreteness of some detection results. BRIEF DESCRIPTION OF THE DRAWINGS

[0043] Figure 1 This is a schematic structural diagram of an automatic oil filling device for detecting the breakdown voltage of insulating oil according to the present invention;

[0044] Figure 2 This is a schematic diagram of the automatic oil filling device system for detecting the breakdown voltage of insulating oil according to the present invention;

[0045] Figure 3 This is a flow chart of the automatic oil filling method for detecting the breakdown voltage of insulating oil according to the present invention;

[0046] Figure 4 The figure shows the breakdown voltage test result of the insulating oil of the present invention.

[0047] Description of reference numerals:

[0048] 1- Oil sample volumetric bottle to be tested, 2- filtration module, 3- oil temperature measurement module, 4- first oil pipeline, 5- first valve, 6- first peristaltic pump, 7- temperature control module, 8- second oil pipeline, 9- second valve, 10- oil injection module, 11- breakdown voltage tester, 12- oil cup, 13- insulating oil level control module, 14- third valve, 15- first flushing oil pipeline, 16- second peristaltic pump, 17- fourth valve, 18- second flushing oil pipeline, 19- flushing oil storage tank, 20- automatic oil filling module. DETAILED DESCRIPTION

[0049] The following will provide a clear and complete description of the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. All other embodiments obtained by ordinary technicians in this field based on the embodiments of the present invention without making any creative efforts shall fall within the scope of protection of the present invention.

[0050] Example 1:

[0051] like Figure 1 and 2 As shown, it shows a schematic structural diagram of the automatic oil filling device for insulating oil breakdown voltage detection of the present invention and a system schematic diagram of the device, including an oil injection component, a breakdown voltage detection component, a temperature measurement and control module and an automatic oil filling module 20;

[0052] The oil injection assembly includes an oil injection module 10, an oil cup 12 and an insulating oil level control module 13;

[0053] The oil injection module 10 is placed inside the oil cup 12, and the insulating oil level control module 13 is fixedly mounted on the upper end of the inner wall of the oil cup 12;

[0054] The breakdown voltage detection assembly includes a volumetric bottle 1 of the oil sample to be tested, a filter module 2, a first peristaltic pump 6 and a breakdown voltage tester 11;

[0055] The filter module 2 for filtering impurities is placed inside the oil sample volumetric bottle 1. One end of the filter module is fixedly connected to the first oil pipeline 4, the first valve 5, and one end of the first peristaltic pump 6. The other end of the first peristaltic pump 6 is fixedly connected to the breakdown voltage tester 11 through the second oil pipeline 8 and the second valve 9.

[0056] The temperature measurement and control component includes an oil temperature measurement module 3 and a temperature control module 7;

[0057] The oil temperature measuring module 3 is fixedly installed at the lower end of the filtering module 2 , and the temperature control module 7 is fixedly connected to the other end of the first peristaltic pump 6 .

[0058] The oil injection assembly and the temperature measurement and control module are fixedly connected to one end of a second peristaltic pump 16 via a third valve 14 and a first flushing oil delivery pipeline 15 , and the other end of the second peristaltic pump 16 is connected to a flushing oil storage tank 19 via a fourth valve 17 .

[0059] The capacity of the oil sample volumetric flask 1 to be tested is 500ml or 1000ml;

[0060] The first oil delivery pipeline 4, the second oil delivery pipeline 8, the first flushing oil delivery pipeline 15 and the second flushing oil delivery pipeline are all made of stainless steel;

[0061] The first peristaltic pump 6 and the second peristaltic pump 16 are variable frequency self-priming pumps and micro pumps with an accuracy of ±0.2ml;

[0062] The first valve 5, the second valve 9, the third valve 14 and the fourth valve 17 are all one-way valves;

[0063] The volume of the flushing oil storage tank 19 is 5L;

[0064] The inner volume of the oil cup 12 is 300 ml.

[0065] Example 2:

[0066] like Figure 2 As shown, it shows a schematic flow chart of the automatic oil filling method for detecting the breakdown voltage of insulating oil according to the present invention,

[0067] Step (1), fixedly connecting the automatic oil filling device for detecting the breakdown voltage of insulating oil to the oil sample to be tested and the breakdown voltage tester 11;

[0068] Step (2): start the first peristaltic pump 6, open the first valve 4 and the second valve 9, and the insulating oil to be tested cleans the oil cup 12 in the breakdown voltage tester 11 through the oil spray module 10 for 3-5 seconds; start the second peristaltic pump 16, open the third valve 14 and the fourth valve 17, and discharge the flushing oil through the second flushing oil delivery pipeline 18 to the flushing oil storage tank 19;

[0069] Step (3), adjusting the flow rate of the first peristaltic pump 6, injecting the oil sample to be tested into the oil cup 12 in the breakdown voltage tester 11, controlling the oil injection amount through the insulating oil level control module 13, stopping the first peristaltic pump 6 after reaching the set oil amount, and closing the first valve 4 and the second valve 9;

[0070] In step (4), while the oil sample to be tested is injected into the oil cup 12, the oil temperature measuring module 3 detects the temperature of the injected oil sample in real time, the temperature control device 7 controls the temperature of the oil sample, and at the same time starts the breakdown voltage tester 11 to test the breakdown voltage of the oil sample to be tested.

[0071] In step (2), the nozzle portion of the oil injection module 10 adopts a shower head design with an opening angle of 150°;

[0072] The flow rate of the oil injection module 10 when flushing the oil cup 12 is 20 ml / s, and the flushing time is 3s-5s;

[0073] The filter module 2 filters particulate impurities larger than 5 microns.

[0074] In step 3, the second peristaltic pump delivers the flushing waste oil to the flushing oil storage tank 19 at a delivery rate of 20 ml / s;

[0075] In step (3), the liquid level control module 13 is interlocked with the first peristaltic pump 6, and the oil filling operation is automatically stopped when the set oil level is reached.

[0076] In step (4), the temperature of the oil sample to be tested and the ambient temperature are measured by the temperature control device 7 connected to the second oil pipeline 8 to adjust the oil temperature; the temperature control device 7 controls the difference between the oil sample temperature and the ambient temperature to be within ±1.0°C;

[0077] In the step (4), the oil injection of the first peristaltic pump 6 is divided into two stages: rapid oil injection and fine oil injection. The flow rate of the rapid oil injection stage is 30 ml / s, and the flow rate of the fine oil injection is 0.5 ml / s. When the oil injection reaches 90% of the set oil sample, the fine oil injection is adopted;

[0078] The set oil volume is 250ml;

[0079] In the step (4), the oil sample to be tested is tested by the breakdown voltage tester 11, and each oil sample is tested 6 times and the arithmetic average is taken as the test value.

[0080] Example 3:

[0081] In a specific implementation, the detection location is a place near the Northwest Substation, and the present invention is used to detect the samples to be tested: appearance: transparent, without sediment and suspended matter, among which, the breakdown voltage value (kV): new oil: ≥70, before commissioning: ≥75, during commissioning: 60; the final conclusion is: the tested items of the (operating) insulating oil in a certain place in the Northwest all meet the standard requirements.

[0082] While embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions, and variations may be made to these embodiments without departing from the principles and spirit of the invention, and that the scope of the invention is defined by the appended claims and their equivalents.

Claims

1. An automatic oil filling device for insulating oil breakdown voltage detection, Its characteristics are: It includes an oil injection component, a breakdown voltage detection component, a temperature measurement and control module and an automatic oil injection module (20); The oil injection assembly comprises an oil injection module (10), an oil cup (12), and an insulating oil level control module (13); The oil injection module (10) is placed inside the oil cup (12), and the insulating oil level control module (13) is fixedly mounted on the upper end of the inner wall of the oil cup (12); The breakdown voltage detection assembly comprises a volumetric bottle of oil sample to be tested (1), a filter module (2), a first peristaltic pump (6) and a breakdown voltage tester (11); The filter module (2) for filtering impurities is placed inside the oil sample volumetric bottle (1); one end of the filter module is fixedly connected to the first oil pipeline (4) and the first valve (5) and one end of the first peristaltic pump (6); the other end of the first peristaltic pump (6) is fixedly connected to the breakdown voltage tester (11) through the second oil pipeline (8) and the second valve (9); The temperature measurement and control component comprises an oil temperature measurement module (3) and a temperature control module (7); The oil temperature measuring module (3) is fixedly mounted on the lower end of the filter module (2), and the temperature control module (7) is fixedly connected to the other end of the first peristaltic pump (6).

2. An automatic oil filling device for insulating oil breakdown voltage detection according to claim 1, Its characteristics are: The oil injection assembly and the temperature measurement and control module are fixedly connected to one end of a second peristaltic pump (16) via a third valve (14) and a first flushing oil delivery pipeline (15); the other end of the second peristaltic pump (16) is connected to a flushing oil storage tank (19) via a fourth valve (17).

3. An automatic oil filling device for insulating oil breakdown voltage detection according to claim 1, Its characteristics are: The capacity of the oil sample volumetric flask (1) to be tested is 500ml or 1000ml; The first oil delivery pipeline (4), the second oil delivery pipeline (8), the first flushing oil delivery pipeline (15), and the second flushing oil delivery pipeline are all made of stainless steel; The first peristaltic pump (6) and the second peristaltic pump (16) are variable frequency self-priming pumps and micro pumps with an accuracy of ±0.2ml; The first valve (5), the second valve (9), the third valve (14) and the fourth valve (17) are all one-way valves; The volume of the flushing oil storage tank (19) is 5L; The internal volume of the oil cup (12) is 300 ml.

4. An automatic oil filling method for insulating oil breakdown voltage detection, An automatic oil filling device for insulating oil breakdown voltage detection according to any one of claims 1 to 3 is used, Its characteristics are: Step (1), fixedly connecting the automatic oil filling device for detecting the breakdown voltage of insulating oil to the oil sample to be tested and the breakdown voltage tester (11); Step (2), starting the first peristaltic pump (6), opening the first valve (4) and the second valve (9), and allowing the insulating oil to be tested to clean the oil cup (12) in the breakdown voltage tester (11) through the oil spray module (10) for 3-5 seconds; starting the second peristaltic pump (16), opening the third valve (14) and the fourth valve (17), and discharging the flushing oil through the second flushing oil delivery pipeline (18) to the flushing oil storage tank (19); Step (3), adjusting the flow rate of the first peristaltic pump (6), injecting the oil sample to be tested into the oil cup (12) in the breakdown voltage tester (11), controlling the oil injection amount through the insulating oil level control module (13), stopping the first peristaltic pump (6) after reaching the set oil amount, and closing the first valve (4) and the second valve (9); In step (4), while the oil sample to be tested is injected into the oil cup (12), the oil temperature measuring module (3) detects the temperature of the injected oil sample in real time, the temperature control device (7) controls the temperature of the oil sample, and simultaneously starts the breakdown voltage tester (11) to test the breakdown voltage of the oil sample to be tested.

5. The automatic oil filling method for insulating oil breakdown voltage detection according to claim 4, Its characteristics are: In the step (2), the nozzle portion of the oil injection module (10) adopts a shower head design with an opening angle of 150°; When the oil injection module (10) flushes the oil cup (12), the flow rate is 20 ml / s, and the flushing time is 3s-5s; The filter module (2) filters particulate impurities larger than 5 microns.

6. The automatic oil filling method for insulating oil breakdown voltage detection according to claim 4, characterized in that: In the step (3), the second peristaltic pump delivers the flushing waste oil to the flushing oil storage tank (19) at a delivery rate of 20 ml / s; In the step (3), the liquid level control module (13) is interlocked with the first peristaltic pump (6), and the oil injection operation is automatically stopped when the set oil level is reached.

7. The automatic oil filling method for insulating oil breakdown voltage detection according to claim 4, characterized in that: In the step (4), the temperature of the oil sample to be tested and the ambient temperature are measured by the temperature control device (7) connected to the second oil pipeline (8) to adjust the oil temperature; the temperature control device (7) controls the difference between the oil sample temperature and the ambient temperature to be within ±1.0°C; In the step (4), the oil injection of the first peristaltic pump (6) is divided into two stages: rapid oil injection and fine oil injection. The flow rate of the rapid oil injection stage is 30 ml / s, and the flow rate of the fine oil injection is 0.5 ml / s. When the oil injection reaches 90% of the set oil sample, the fine oil injection is used; The set oil volume is 250ml; In the step (4), the oil sample to be tested is tested by the breakdown voltage tester (11), and each oil sample is tested 6 times and the arithmetic average is taken as the test value.

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