Ester-based insulating oil electrification degree detection device, processing device and control method thereof

Abstract

The invention relates to the technical field of oil flow live-line measurement, and discloses an ester-based insulating oil electrification degree detection device, a processing device and a control method thereof, and the device comprises an oil flow live-line box, an insulating pipeline section, a first permeation valve, an oil drop friction power generation unit, a second permeation valve and an electrometer; the oil flow electrified box is provided with a top end opening and a bottom end opening in the vertical direction; the insulating pipeline section is arranged in the oil flow electrified box; the first permeation valve is arranged at the top of the insulating pipeline section; the second permeation valve is arranged at the bottom of the insulating pipeline section; the first end of the oil drop friction power generation unit is connected with the first permeation valve; the second end of the drop friction power generation unit is connected with the second permeation valve; the oil drop friction power generation unit is used for being in friction contact with ester-based insulating oil to generate test charges; and the electrometer is connected with the oil drop friction power generation unit and is used for detecting the test charges to obtain the electrification degree of the ester-based insulating oil. According to the invention, the electrification degree detection precision of the ester-based insulating oil can be improved.

Description

Technical Field

[0001] The invention relates to the technical field of oil flow charge measurement, and in particular to an ester-based insulating oil charge degree detection device, a processing device and a control method thereof. Background Art

[0002] Transformers play a core role in the power grid, and the safety and stability of their operation are crucial to the performance of the entire power grid. In this system, insulating oil plays a vital role and has a decisive impact on the normal operation of the transformer. Compared with traditional mineral insulating oil, ester-based insulating oil has a fairly stable transformer operation state and is environmentally friendly, with almost zero carbon emissions. This not only meets the current global pursuit of environmental protection and carbon neutrality, but also provides the possibility for the power industry to achieve more sustainable development.

[0003] However, compared with mineral insulating oil, ester-based insulating oil has a higher viscosity, which makes it easier to cause oil flow electrification faults in the oil flow circulation inside the transformer. Most of the current methods for evaluating the degree of oil flow electrification use offline detection methods, which control the flow rate of the insulating oil to allow the insulating oil to pass through the stainless steel wire mesh or filter in the measuring box to achieve charge separation, and then use an electrometer to measure the current formed by the charge accumulation. The current formed by the accumulated charge on the surface of the wire mesh or filter will be polarized under the action of the positive and negative polarity ports of the external electrometer to form a charge transfer channel, but the existing insulating oil rush current measurement channel is generally long, which will affect its surface charge polarization process, resulting in partial charge leakage, and thus affecting the detection accuracy. Moreover, ester-based insulating oil has a higher tendency to be charged than mineral insulating oil. Therefore, applying the current method for evaluating the degree of insulating oil electrification to ester-based insulating oil will result in inaccurate measurements. Summary of the invention

[0004] The invention provides an ester-based insulating oil charge degree detection device, a processing device and a control method thereof, which can improve the charge degree detection accuracy of the ester-based insulating oil.

[0005] In order to solve the above technical problems, the present invention provides an ester-based insulating oil charged degree detection device, a processing device and a control method thereof.

[0006] In a first aspect, the present invention provides an ester-based insulating oil charge degree detection device, comprising: an oil flow charge box, an insulating pipe section, a first permeation valve, an oil droplet friction power generation unit, a second permeation valve and an electrometer;

[0007] The oil flow charging box is provided with a top opening and a bottom opening in the vertical direction;

[0008] The insulating pipe section is arranged inside the oil flow charging box; wherein the top of the insulating pipe section is connected to the top opening, and the bottom of the insulating pipe section is connected to the bottom opening;

[0009] The first permeation valve is disposed at the top of the insulating pipe section;

[0010] The second permeation valve is arranged at the bottom of the insulating pipe section;

[0011] The first end of the oil droplet friction power generation unit is connected to the first permeation valve; the second end of the oil droplet friction power generation unit is connected to the second permeation valve;

[0012] The oil droplet friction power generation unit is used for friction contact with the ester-based insulating oil to generate a test charge;

[0013] The electrometer is connected to the oil droplet friction power generation unit and is used to detect the test charge and obtain the charge degree of the ester-based insulating oil.

[0014] Further, the oil drop friction power generation unit comprises: a friction drop surface, a recovery device and a recovery drainage pipe;

[0015] The first end of the friction dripping surface is connected to the first permeation valve; the second end of the friction dripping surface is connected to the recoverer;

[0016] The recycler is arranged on the inner wall of the oil flow charging box;

[0017] The first end of the recovery drainage tube is connected to the recovery device; the first end of the recovery drainage tube is connected to the second permeation valve;

[0018] The friction dripping surface is used for friction contact with the ester-based insulating oil to generate a test charge;

[0019] The electrometer is connected to the friction dripping surface and is used to detect the test charge and obtain the charge degree of the ester-based insulating oil.

[0020] Further, the friction dripping surface comprises: a copper electrode and a polyimide film;

[0021] The surface of the copper electrode is covered with the polyimide film;

[0022] The first end of the copper electrode is connected to the first permeation valve; the second end of the copper electrode is connected to the first permeation valve;

[0023] The copper electrode is used for frictional contact with the ester-based insulating oil to generate a test charge;

[0024] The electrometer is connected to the copper electrode and is used to detect the test charge and obtain the charge degree of the ester-based insulating oil.

[0025] Furthermore, the electrometer is connected to the copper electrode to detect the test charge and obtain the charge degree of the ester-based insulating oil, specifically:

[0026] The positive polarity port of the electrometer is connected to a first predetermined side of the copper electrode;

[0027] The negative polarity port of the electrometer is connected to a second predetermined side of the copper electrode;

[0028] Wherein, when the first preset side of the copper electrode is the first side of the copper electrode, determining the second preset side of the copper electrode to be the second side of the copper electrode;

[0029] When the first preset side of the copper electrode is the second side of the copper electrode, the second preset side of the copper electrode is determined to be the first side of the copper electrode.

[0030] Furthermore, the friction dripping surface further includes: fluorinated silicon dioxide material;

[0031] The fluorinated silicon dioxide material covers the surface of the polyimide film.

[0032] In a second aspect, the present invention provides an ester-based insulating oil charged degree treatment device, comprising: an ester-based insulating oil input device, an ester-based insulating oil charged degree detection device and an ester-based insulating oil charged degree purification device connected through an insulating tube;

[0033] The ester-based insulating oil input device comprises a transformer oil outlet valve, a temperature control tank, a first switch valve, a first discharge box and a second switch valve which are sequentially connected through an insulating pipe;

[0034] The ester-based insulating oil charge degree detection device comprises an oil flow charge box, an insulating pipe section, a first permeation valve, an oil droplet friction power generation unit, a second permeation valve and an electrometer; the oil flow charge box is provided with a top opening and a bottom opening in the vertical direction; the insulating pipe section is arranged inside the oil flow charge box; wherein the top of the insulating pipe section is connected to the top opening, and the bottom of the insulating pipe section is connected to the bottom opening; the first permeation valve is arranged at the top of the insulating pipe section; the second permeation valve is arranged at the bottom of the insulating pipe section; the first end of the oil droplet friction power generation unit is connected to the first permeation valve; the second end of the oil droplet friction power generation unit is connected to the second permeation valve; the oil droplet friction power generation unit is used to frictionally contact with the ester-based insulating oil to generate a test charge; the electrometer is connected to the oil droplet friction power generation unit to detect the test charge and obtain the charge degree of the ester-based insulating oil;

[0035] The ester-based insulating oil live degree purification device comprises a second discharge box, a reaction tank, a decanting tank, an oil filter tank and a transformer oil inlet valve which are sequentially connected through insulating pipes;

[0036] The ester-based insulating oil input device is used to obtain the ester-based insulating oil from the transformer box, and transmit the ester-based insulating oil to the ester-based insulating oil charged degree detection device through an insulating pipe;

[0037] The ester-based insulating oil charge degree detection device is used to frictionally contact with the ester-based insulating oil and generate a test charge, and the charge degree of the ester-based insulating oil is obtained by detecting the test charge;

[0038] The ester-based insulating oil charged degree purification device is used for performing a circulating purification process on the ester-based insulating oil to reduce the charged degree of the ester-based insulating oil.

[0039] Furthermore, the ester-based insulating oil input device further includes:

[0040] A first circulation pump is provided on the insulating pipe between the transformer oil outlet valve and the temperature control tank, and a second circulation pump and a flow meter are provided on the insulating pipe between the second switch valve and the ester-based insulating oil charged degree detection device;

[0041] The flow meter is used to measure the flow rate of ester-based insulating oil.

[0042] Furthermore, the ester-based insulating oil charged degree purification device further comprises:

[0043] A third circulation pump is arranged on the insulating pipe between the oil filter tank and the transformer oil inlet valve; a physical adsorbent, a mechanical stirrer control motor and a mechanical stirrer are arranged inside the reaction tank;

[0044] The mechanical stirrer control motor is used to provide power to the mechanical stirrer;

[0045] The mechanical stirrer is used to mix the physical adsorbent and the ester-based insulating oil to perform physical adsorption treatment on the ester-based insulating oil.

[0046] In a third aspect, the present invention provides a control method for an ester-based insulating oil charged degree detection device, which is used to control the ester-based insulating oil charged degree detection device as described above, and the control method comprises:

[0047] Controlling the ester-based insulating oil to come into frictional contact with a preset oil drop friction power generation unit to generate a test charge;

[0048] By detecting the test charge, the charge degree of the ester-based insulating oil is obtained.

[0049] In a fourth aspect, the present invention provides a control method for an ester-based insulating oil charged degree treatment device, which is used to control the ester-based insulating oil charged degree treatment device as described above, and the control method comprises:

[0050] Ester-based insulating oils are obtained from transformers;

[0051] Controlling the ester-based insulating oil to generate a test charge through friction, and obtaining the charge degree of the ester-based insulating oil by detecting the test charge;

[0052] The ester-based insulating oil is subjected to a circulating purification treatment to reduce the degree of charge of the ester-based insulating oil.

[0053] The ester-based insulating oil charge degree detection device of the present invention comprises an oil flow charge box, an insulating pipeline section, a first permeation valve, an oil drop friction power generation unit, a second permeation valve and an electrometer, wherein the ester-based insulating oil enters the oil flow charge box through the top of the insulating pipeline section, and drips to the oil drop friction power generation unit through the first permeation valve, and the ester-based insulating oil is in friction contact with the oil drop friction power generation unit, enters the insulating pipeline section through the second permeation valve, and flows out through the bottom of the insulating pipeline section. After the ester-based insulating oil is in friction contact with the oil drop friction power generation unit, a test charge is generated, and the electrometer is connected to the oil drop friction power generation unit, and the charge degree of the ester-based insulating oil can be known by detecting the test charge. The present invention realizes charge separation of the ester-based insulating oil based on the friction effect, and then detects the charge degree of the ester-based insulating oil, which can effectively improve the detection accuracy of the charge degree of the ester-based insulating oil. BRIEF DESCRIPTION OF THE DRAWINGS

[0054] Figure 1 A schematic diagram of a flow chart of an embodiment of a device for detecting the charge level of ester-based insulating oil provided by the present invention;

[0055] Figure 2 A schematic diagram of a flow chart of an embodiment of a device for treating charged ester-based insulating oil provided by the present invention;

[0056] Figure 3 A schematic diagram of a flow chart of an embodiment of the ester-based insulating oil charged input device provided by the present invention;

[0057] Figure 4 A schematic diagram of a flow chart of another embodiment of the ester-based insulating oil live degree purification device provided by the present invention;

[0058] Figure 5 A curve diagram of oil flow charge variation trend provided by an embodiment of the present invention;

[0059] Figure 6 Another oil flow charge variation trend curve diagram provided by an embodiment of the present invention;

[0060] Figure 7Another oil flow charge variation trend curve diagram provided by an embodiment of the present invention;

[0061] Figure 8 An oleic acid value variation trend curve provided by an embodiment of the present invention. DETAILED DESCRIPTION

[0062] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0063] The flowcharts shown in the accompanying drawings are only examples and do not necessarily include all the contents and operations / steps, nor must they be executed in the order described. For example, some operations / steps may also be decomposed, combined or partially merged, so the actual execution order may change according to actual conditions.

[0064] Some embodiments of the present invention are described in detail below in conjunction with the accompanying drawings. In the absence of conflict, the following embodiments and features in the embodiments can be combined with each other.

[0065] like Figure 1 , which is a schematic structural diagram of an embodiment of a device for detecting the charge degree of ester-based insulating oil provided by the present invention, the device comprises an oil flow charge box 1, an insulating pipe section 2, a first permeation valve 3, an oil droplet friction power generation unit 4, a second permeation valve 5 and an electrometer 6;

[0066] The oil flow charging box 1 is provided with a top opening and a bottom opening in the vertical direction;

[0067] The insulating pipe section 2 is arranged inside the oil flow charging box; wherein the top of the insulating pipe section 2 is connected to the top opening, and the bottom of the insulating pipe section 2 is connected to the bottom opening;

[0068] The first permeation valve 3 is arranged at the top of the insulating pipe section;

[0069] The second permeation valve 5 is arranged at the bottom of the insulating pipe section;

[0070] The first end of the oil droplet friction power generation unit 4 is connected to the first permeation valve 3; the second end of the oil droplet friction power generation unit 4 is connected to the second permeation valve 5;

[0071] The oil droplet friction power generation unit 4 is used for friction contact with the ester-based insulating oil to generate a test charge;

[0072] The electrometer 6 is connected to the oil droplet friction power generation unit 4 and is used to detect the test charge and obtain the charge degree of the ester-based insulating oil.

[0073] Further, in the embodiment of the present invention, the oil drop friction power generation unit 4 comprises: a friction drop surface 41, a recovery device 42 and a recovery drainage pipe 43;

[0074] The first end of the friction dripping surface 41 is connected to the first permeation valve 3; the second end of the friction dripping surface 41 is connected to the recoverer 42;

[0075] The recycler 42 is arranged on the inner wall of the oil flow charging box 1;

[0076] The first end of the recovery drainage tube 43 is connected to the recovery device 42; the first end of the recovery drainage tube 43 is connected to the second permeation valve 5;

[0077] The friction dripping surface 41 is used for friction contact with the ester-based insulating oil to generate a test charge;

[0078] The electrometer 6 is connected to the friction dripping surface 41 and is used to detect the test charge and obtain the charge degree of the ester-based insulating oil.

[0079] Further, in the embodiment of the present invention, the friction dripping surface 41 includes: a copper electrode and a polyimide film;

[0080] The surface of the copper electrode is covered with the polyimide film;

[0081] The first end of the copper electrode is connected to the first permeation valve; the second end of the copper electrode is connected to the first permeation valve;

[0082] The copper electrode is used for frictional contact with the ester-based insulating oil to generate a test charge;

[0083] The electrometer is connected to the copper electrode and is used to detect the test charge and obtain the charge degree of the ester-based insulating oil.

[0084] Further, in the embodiment of the present invention, the electrometer 6 is connected to the copper electrode to detect the test charge and obtain the charge degree of the ester-based insulating oil, specifically:

[0085] The positive polarity port of the electrometer 6 is connected to the first preset side of the copper electrode;

[0086] The negative polarity port of the electrometer 6 is connected to the second preset side of the copper electrode;

[0087] Wherein, when the first preset side of the copper electrode is the first side of the copper electrode, determining the second preset side of the copper electrode to be the second side of the copper electrode;

[0088] When the first preset side of the copper electrode is the second side of the copper electrode, the second preset side of the copper electrode is determined to be the first side of the copper electrode.

[0089] Furthermore, in the embodiment of the present invention, the friction dripping surface 41 further includes: fluorinated silicon dioxide material;

[0090] The fluorinated silicon dioxide material covers the surface of the polyimide film.

[0091] Specifically, the ester-based insulating oil enters the oil flow charging box 1 through the top of the insulating pipe section 2. The first permeation valve 3 is arranged on both sides of the top of the insulating pipe section. The ester-based insulating oil drips through the first permeation valve 3 to the oil drop friction power generation unit 4. The oil drop friction power generation unit includes a friction dripping surface 41, a recovery device 42 and a recovery drainage pipe 43. The friction dripping surface 41 is set as a copper electrode with a certain inclination angle. The surface of the copper electrode is covered with a polyimide film (Kapton) covered with a fluorinated silicon dioxide material as a strong negative polarity dielectric material. The ester-based insulating oil with a large amount of positive charge is used as a positive polarity dielectric material. When the ester-based insulating oil drips onto the Kapton covered by fluorinated silica material through the first permeation valve 3 at a certain flow rate, the ester-based insulating oil carries a large amount of positive charge, which causes electrostatic induction on the surface of the Kapton to generate negative charge. As the oil slides along the inclined surface, friction and electrostatic induction act, causing a large amount of positive and negative charge to be induced in the copper electrode covered by the Kapton. The positive and negative polarity ports of the electrometer 6 are connected to the upper and lower ends of the inclined copper electrode, respectively, and the current formed by the charge transfer can be measured. The ester-based insulating oil enters the second permeation valve 5 through the recovery device 42 and the recovery drainage pipe 43 at the bottom of the oil drop friction power generation unit 4, and finally enters the insulating pipeline section 2, and flows out through the bottom of the insulating pipeline section 2.

[0092] Preferably, under the action of the oil flow, the ester-based insulating oil droplets entering the oil flow charging box penetrate from the first permeation valves 3 on both sides, and come into friction contact with the friction dripping surfaces 41 on both sides, resulting in charge separation. By connecting the copper electrodes in the friction dripping surfaces 41 to the electrometer 6 respectively, the accumulated current I generated by the charge on the solid insulating surface can be measured, which is the rush current value of the oil flow, and is used to evaluate the degree of oil flow charging of the ester-based insulating oil in operation. In order to ensure the accuracy of the measurement, a metal electromagnetic shielding box can be installed outside the oil flow charging box and the measuring box to reduce the impact of external electromagnetic interference on the measurement and improve the accuracy and reliability of the test.

[0093] The ester-based insulating oil charge detection device of the present invention can be effectively applied to the circulation treatment process of ester-based insulating oil in on-site transformers, accurately evaluate the charge degree of the oil flow, and provide a corresponding insulating oil charge purification treatment plan, providing strong support for the stable operation of the power system.

[0094] See also Figure 2-Figure 4 The present invention provides an ester-based insulating oil charged degree treatment device, which comprises an ester-based insulating oil charged degree treatment device 101, an ester-based insulating oil charged degree detection device 102 and an ester-based insulating oil charged degree purification device 103 connected through an insulating tube;

[0095] The ester-based insulating oil input device 101 includes a transformer oil outlet valve 8, a temperature control tank 10, a first switch valve 11, a first discharge box 12, and a second switch valve 13, which are sequentially connected through an insulating pipe 7;

[0096] The ester-based insulating oil charge degree detection device 102 comprises an oil flow charge box 1, an insulating pipe section 2, a first permeation valve 3, an oil droplet friction power generation unit 4, a second permeation valve 5 and an electrometer 6; the oil flow charge box 1 is provided with a top opening and a bottom opening in the vertical direction; the insulating pipe section 2 is arranged inside the oil flow charge box; wherein the top of the insulating pipe section 2 is connected to the top opening, and the bottom of the insulating pipe section 2 is connected to the bottom opening; the first permeation valve 3 is arranged at the top of the insulating pipe section; the second permeation valve 5 is arranged at the bottom of the insulating pipe section; the first end of the oil droplet friction power generation unit 4 is connected to the first permeation valve 3; the second end of the oil droplet friction power generation unit 4 is connected to the second permeation valve 5; the oil droplet friction power generation unit 4 is used for frictionally contacting with the ester-based insulating oil to generate a test charge; the electrometer 6 is connected to the oil droplet friction power generation unit to detect the test charge and obtain the charge degree of the ester-based insulating oil;

[0097] The ester-based insulating oil charged purification device 103 comprises a second discharge box 16, a reaction tank 18, a decanting tank 20, an oil filter tank 21 and a transformer oil inlet valve 23 which are sequentially connected through an insulating pipe 7;

[0098] The ester-based insulating oil input device 101 is used to obtain the ester-based insulating oil from the transformer box, and transmit the ester-based insulating oil to the ester-based insulating oil charged degree detection device through an insulating pipe;

[0099] The ester-based insulating oil charge degree detection device 102 is used for frictionally contacting with the ester-based insulating oil and generating a test charge, and obtaining the charge degree of the ester-based insulating oil by detecting the test charge;

[0100] The ester-based insulating oil charged degree purification device 103 is used to perform a circulating purification process on the ester-based insulating oil to reduce the charged degree of the ester-based insulating oil.

[0101] Furthermore, in the embodiment of the present invention, the ester-based insulating oil input device 101 further includes:

[0102] A first circulation pump 9 is provided on the insulating pipe between the transformer oil outlet valve 8 and the temperature control tank 10, and a second circulation pump 14 and a flow meter 15 are provided on the insulating pipe between the second switch valve 13 and the ester-based insulating oil charged degree detection device 102;

[0103] The flow meter 15 is used to measure the flow rate of the ester-based insulating oil.

[0104] Furthermore, in the embodiment of the present invention, the ester-based insulating oil charged degree purification device 103 further includes:

[0105] A third circulation pump 22 is provided on the insulating pipe between the oil filter tank 21 and the transformer oil inlet valve 23; a physical adsorbent, a mechanical stirrer control motor 17 and a mechanical stirrer 19 are provided inside the reaction tank 18;

[0106] The mechanical stirrer control motor 17 is used to provide power to the mechanical stirrer;

[0107] The mechanical stirrer 19 is used to mix the physical adsorbent and the ester-based insulating oil to perform physical adsorption treatment on the ester-based insulating oil.

[0108] In the embodiment of the present invention, the friction effect is utilized, and the ester-based insulating oil charge degree treatment device of the embodiment is used to accurately evaluate the oil flow charge degree of the ester-based insulating oil under the condition of live operation of the transformer, and effectively suppress the oil flow charge phenomenon through purification treatment. The entire ester-based insulating oil charge degree treatment device mainly comprises an ester-based insulating oil input device 101, an ester-based insulating oil charge degree detection device 102 and an ester-based insulating oil charge degree purification device 103. The ester-based insulating oil charge degree treatment device is connected to the inside of the transformer box, thereby realizing the oil flow charge test and charge elimination of the ester-based insulating oil in the transformer operating on site.

[0109] Specifically, the ester-based insulating oil input device 101 includes a transformer oil outlet valve 8, a first circulation pump 9, a temperature control tank 10, a first switch valve 11, a first discharge box 12, a second switch valve 13, a second circulation pump 14 and a flow meter 15 connected in sequence through an insulating pipe 7. The ester-based insulating oil charge detection device 102 includes an oil flow charge box 1, an insulating pipe section 2, a first permeation valve 3, an oil drop friction power generation unit 4, a second permeation valve 5 and an electrometer 6. These components are connected in order through an insulating pipe to ensure the accuracy and safety of the charge test. Through such a design and configuration, the ester-based insulating oil processing device of the embodiment of the present invention can be effectively applied to the circulation processing process of ester-based insulating oil in the on-site transformer, accurately evaluate the charge degree of the oil flow, and provide a corresponding insulating oil charge purification treatment plan, which provides strong support for the stable operation of the power system.

[0110] Preferably, based on the ester-based insulating oil input device and the ester-based insulating oil detection device, during the test, the transformer box is connected to the transformer oil outlet valve 8 through the insulating pipe 7, and then connected to the first circulating pump 9. Under the action of the first circulating pump 9, the ester-based insulating oil is drawn out of the transformer box and enters the temperature control tank 10 for temperature control, and its temperature control range is set at 60-90°C. In order to ensure that the transformer oil flowing into the oil flow charged box is electrically neutral, the temperature control tank 10 is connected to the first discharge box 12 through the first switch valve 11. A stainless steel filter is installed in the first discharge box 12 to ensure that the charge in the oil can be fully released before flowing into the oil flow charged box. The first switch valve 11 can control the time that the ester-based insulating oil stays in the first discharge box 12, so as to better discharge the charged insulating oil. Afterwards, the first discharge box 12 is connected to the electromagnetic shielding box through the second switch valve 13. Driven by the first circulating pump 9 , the ester-based insulating oil enters the oil flow charging box 1 at a certain flow rate, and the flow rate of the insulating oil entering the oil flow charging box is accurately measured by the flow meter 15 .

[0111] Specifically, the ester-based insulating oil charged degree purification device 103 includes a second discharge box 16, a mechanical stirrer control motor 17, a reaction tank 18, a mechanical stirrer 19, a decanting tank 20, an oil filter tank 21, a third circulation pump 22 and a transformer oil inlet valve 23, which are sequentially connected through an insulating pipe 7. The main task of the ester-based insulating oil charged degree purification device 103 is to eliminate the charge of the ester-based insulating oil in the transformer, thereby suppressing the oil flow charge phenomenon.

[0112] Preferably, the ester-based insulating oil with a large amount of charge flowing out from the bottom of the insulating pipe section 2 first enters the second discharge box 16 in the ester-based insulating oil charged degree purification device 103. The function of the second discharge box 16 is to fully discharge the insulating oil to ensure that the charge in the oil has been fully released before returning to the transformer box, thereby effectively avoiding the problem of oil flow charge in the insulating oil in the transformer box during operation. The insulating oil discharged by the second discharge box 16 will continue to flow into the reaction tank 18. A certain amount of physical adsorbent can be placed in the reaction tank 18. Under the action of the mechanical stirrer control motor 17, the mechanical stirrer 19 works at a certain speed so that the physical adsorbent inside the reaction tank 18 is fully in contact with the insulating oil, and the insulating oil is adsorbed. The insulating oil after physical adsorption treatment will enter the decanting tank 20. The decanting tank 20 can realize the solid-liquid separation of the insulating oil and the adsorbent, ensuring that the adsorbent can be effectively separated. After that, the insulating oil will flow into the oil filter tank 21, and the filter membrane in the oil filter tank 21 can block a small amount of solid reagent passing through the decanting tank 20. A third circulation pump 22 is installed at the bottom of the transformer box, and the flow rate of the insulating oil is controlled by the transformer oil inlet valve 23, thereby further preventing the insulating oil flowing back into the box from being charged due to excessive circulation flow rate, thereby ensuring the normal operation of the transformer.

[0113] The ester-based insulating oil charge degree detection device of the embodiment of the present invention can not only purify the charged ester-based insulating oil, but also measure the oil flow rush current of the ester-based insulating oil in operation in real time during the purification process to evaluate its charge degree. Combining the charge measurement and purification of the oil flow, a deeper understanding of the charge characteristics of the insulating oil flow can be obtained. This provides an effective solution for the purification and regeneration of ester-based insulating oil in transformers in operation on site, and also provides a practical tool for evaluating the degree of hazard of the charge of the ester-based insulating oil flow.

[0114] In order to facilitate understanding and verify the effect of this solution, the insulating oil treatment device proposed in this embodiment was used to measure the flow current of 500L of ester-based insulating oil that was subjected to accelerated thermal aging at 130°C for 20 days in the laboratory. In the circulation purification process, filtration and physical adsorption methods were used to further improve the degree of oil flow charge. The adsorbent used in the circulation treatment is activated clay, the temperature of the circulating insulating oil is controlled at 60°C, and the flow rate of the vacuum pump is set to 0.5L / min. Figure 5 It can be seen that under a constant flow rate, the inrush current curve of the ester-based insulating oil shows a downward trend over time. In particular, after 10 hours, the change trend of the inrush current has gradually become gentle. Figure 6 The graph shows the change in the inrush current measurement curve of ester-based insulating oil when the system flow rate increases. It can be seen that as the flow rate increases, the overall value of the inrush current also increases. However, after 40 hours of cyclic purification treatment, the inrush current values ​​at all flow rates tend to the same value. This shows that the purification cycle treatment has a significant effect on suppressing the electrification of the oil flow. In addition, Figure 7 and Figure 8 It also shows that under the above experimental conditions, the oil acid value and moisture content of ester-based insulating oil show a downward trend during the circulation process. This shows that polar substances in the oil are an important factor affecting the change of rush current. Through filtration and adsorption treatment, the oil flow can be effectively suppressed.

[0115] In one embodiment, the present invention provides a control method for an ester-based insulating oil charged degree detection device, which is used to control the ester-based insulating oil charged degree detection device as described above, and the control method includes:

[0116] Controlling the ester-based insulating oil to come into frictional contact with a preset oil drop friction power generation unit to generate a test charge;

[0117] By detecting the test charge, the charge degree of the ester-based insulating oil is obtained.

[0118] For the specific definition of the control method of an ester-based insulating oil live degree detection device, please refer to the above-mentioned definition of an ester-based insulating oil live degree detection device, which will not be repeated here. A person of ordinary skill in the art can appreciate that the various modules and steps described in conjunction with the embodiments disclosed in this application can be implemented in hardware, software, or a combination of both. Whether these functions are performed in hardware or software depends on the specific application and design constraints of the technical solution. Professional and technical personnel can use different methods to implement the described functions for each specific application, but such implementation should not be considered to be beyond the scope of this application.

[0119] In one embodiment, the present invention provides a control method for an ester-based insulating oil charged degree treatment device, which is used to control the ester-based insulating oil charged degree treatment device as described above, and the control method includes:

[0120] Ester-based insulating oils are obtained from transformers;

[0121] Controlling the ester-based insulating oil to generate a test charge through friction, and obtaining the charge degree of the ester-based insulating oil by detecting the test charge;

[0122] The ester-based insulating oil is subjected to a circulating purification treatment to reduce the degree of charge of the ester-based insulating oil.

[0123] For the specific definition of the control method of an ester-based insulating oil live degree treatment device, please refer to the above-mentioned definition of an ester-based insulating oil live degree treatment device, which will not be repeated here. A person of ordinary skill in the art can appreciate that the various modules and steps described in conjunction with the embodiments disclosed in this application can be implemented in hardware, software, or a combination of both. Whether these functions are performed in hardware or software depends on the specific application and design constraints of the technical solution. Professional and technical personnel can use different methods to implement the described functions for each specific application, but such implementation should not be considered to be beyond the scope of this application.

[0124] In summary, the ester-based insulating oil charge degree detection device provided by the embodiment of the present invention includes an oil flow charge box, an insulating pipeline section, a first permeation valve, an oil droplet friction power generation unit, a second permeation valve and an electrometer. The ester-based insulating oil enters the oil flow charge box through the top of the insulating pipeline section, and drips to the oil droplet friction power generation unit through the first permeation valve. The ester-based insulating oil is in friction contact with the oil droplet friction power generation unit, enters the insulating pipeline section through the second permeation valve, and flows out through the bottom of the insulating pipeline section. After the ester-based insulating oil is in friction contact with the oil droplet friction power generation unit, a test charge is generated, and the electrometer is connected to the oil droplet friction power generation unit. The charge degree of the ester-based insulating oil can be known by detecting the test charge. The present invention realizes charge separation of the ester-based insulating oil based on the friction effect, and then detects the charge degree of the ester-based insulating oil, which can effectively improve the detection accuracy of the charge degree of the ester-based insulating oil.

[0125] The specific embodiments described above further illustrate the purpose, technical solutions and beneficial effects of the present invention. It should be understood that the above description is only a specific embodiment of the present invention and is not intended to limit the scope of protection of the present invention. It is particularly pointed out that for those skilled in the art, any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention should be included in the scope of protection of the present invention.

Claims

1. An ester-based insulating oil charge detection device, characterized in that: include: An oil flow charging box, an insulating pipe section, a first permeation valve, an oil droplet friction power generation unit, a second permeation valve and an electrometer; The oil flow charging box is provided with a top opening and a bottom opening in the vertical direction; The insulating pipe section is arranged inside the oil flow charging box; wherein the top of the insulating pipe section is connected to the top opening, and the bottom of the insulating pipe section is connected to the bottom opening; The first permeation valve is disposed at the top of the insulating pipe section; The second permeation valve is arranged at the bottom of the insulating pipe section; The first end of the oil droplet friction power generation unit is connected to the first permeation valve; the second end of the oil droplet friction power generation unit is connected to the second permeation valve; The oil droplet friction power generation unit is used for friction contact with the ester-based insulating oil to generate a test charge; The electrometer is connected to the oil droplet friction power generation unit and is used to detect the test charge and obtain the charge degree of the ester-based insulating oil.

2. The ester-based insulating oil charge detection device according to claim 1, characterized in that: The oil drop friction power generation unit comprises: a friction drop surface, a recovery device and a recovery drainage pipe; The first end of the friction dripping surface is connected to the first permeation valve; the second end of the friction dripping surface is connected to the recoverer; The recycler is arranged on the inner wall of the oil flow charging box; The first end of the recovery drainage tube is connected to the recovery device; the first end of the recovery drainage tube is connected to the second permeation valve; The friction dripping surface is used for friction contact with the ester-based insulating oil to generate a test charge; The electrometer is connected to the friction dripping surface and is used to detect the test charge and obtain the charge degree of the ester-based insulating oil.

3. The ester-based insulating oil charge detection device according to claim 2, characterized in that: The friction dripping surface comprises: a copper electrode and a polyimide film; The surface of the copper electrode is covered with the polyimide film; The first end of the copper electrode is connected to the first permeation valve; the second end of the copper electrode is connected to the first permeation valve; The copper electrode is used for frictional contact with the ester-based insulating oil to generate a test charge; The electrometer is connected to the copper electrode and is used to detect the test charge and obtain the charge degree of the ester-based insulating oil.

4. The ester-based insulating oil charge detection device according to claim 3 is characterized in that: The electrometer is connected to the copper electrode to detect the test charge and obtain the charge degree of the ester-based insulating oil, specifically: The positive polarity port of the electrometer is connected to a first predetermined side of the copper electrode; The negative polarity port of the electrometer is connected to a second predetermined side of the copper electrode; Wherein, when the first preset side of the copper electrode is the first side of the copper electrode, determining the second preset side of the copper electrode to be the second side of the copper electrode; When the first preset side of the copper electrode is the second side of the copper electrode, the second preset side of the copper electrode is determined to be the first side of the copper electrode.

5. The ester-based insulating oil charge detection device according to claim 3, characterized in that: The friction dripping surface further includes: fluorinated silicon dioxide material; The fluorinated silicon dioxide material covers the surface of the polyimide film.

6. An ester-based insulating oil charged degree treatment device, characterized in that: include: An ester-based insulating oil input device, an ester-based insulating oil charge detection device and an ester-based insulating oil charge purification device connected through an insulating tube; The ester-based insulating oil input device comprises a transformer oil outlet valve, a temperature control tank, a first switch valve, a first discharge box and a second switch valve which are sequentially connected through an insulating pipe; The ester-based insulating oil charge degree detection device comprises an oil flow charge box, an insulating pipe section, a first permeation valve, an oil droplet friction power generation unit, a second permeation valve and an electrometer; the oil flow charge box is provided with a top opening and a bottom opening in the vertical direction; the insulating pipe section is arranged inside the oil flow charge box; wherein the top of the insulating pipe section is connected to the top opening, and the bottom of the insulating pipe section is connected to the bottom opening; the first permeation valve is arranged at the top of the insulating pipe section; the second permeation valve is arranged at the bottom of the insulating pipe section; the first end of the oil droplet friction power generation unit is connected to the first permeation valve; the second end of the oil droplet friction power generation unit is connected to the second permeation valve; the oil droplet friction power generation unit is used to frictionally contact with the ester-based insulating oil to generate a test charge; the electrometer is connected to the oil droplet friction power generation unit to detect the test charge and obtain the charge degree of the ester-based insulating oil; The ester-based insulating oil live degree purification device comprises a second discharge box, a reaction tank, a decanting tank, an oil filter tank and a transformer oil inlet valve which are sequentially connected through insulating pipes; The ester-based insulating oil input device is used to obtain the ester-based insulating oil from the transformer box, and transmit the ester-based insulating oil to the ester-based insulating oil charged degree detection device through an insulating pipe; The ester-based insulating oil charge degree detection device is used to frictionally contact with the ester-based insulating oil and generate a test charge, and the charge degree of the ester-based insulating oil is obtained by detecting the test charge; The ester-based insulating oil charged degree purification device is used for performing a circulating purification process on the ester-based insulating oil to reduce the charged degree of the ester-based insulating oil.

7. The device for treating charged ester-based insulating oil according to claim 6, characterized in that: The ester-based insulating oil input device further comprises: A first circulation pump is provided on the insulating pipe between the transformer oil outlet valve and the temperature control tank, and a second circulation pump and a flow meter are provided on the insulating pipe between the second switch valve and the ester-based insulating oil charged degree detection device; The flow meter is used to measure the flow rate of ester-based insulating oil.

8. The device for treating charged ester-based insulating oil according to claim 6, characterized in that: The ester-based insulating oil charged degree purification device also includes: A third circulation pump is arranged on the insulating pipe between the oil filter tank and the transformer oil inlet valve; a physical adsorbent, a mechanical stirrer control motor and a mechanical stirrer are arranged inside the reaction tank; The mechanical stirrer control motor is used to provide power to the mechanical stirrer; The mechanical stirrer is used to mix the physical adsorbent and the ester-based insulating oil to perform physical adsorption treatment on the ester-based insulating oil.

9. A control method for an ester-based insulating oil charge detection device, characterized in that: The device for detecting the charge level of ester-based insulating oil according to any one of claims 1 to 5 is used to control the control method comprising: Controlling the ester-based insulating oil to come into frictional contact with a preset oil drop friction power generation unit to generate a test charge; By detecting the test charge, the charge degree of the ester-based insulating oil is obtained.

10. A control method for an ester-based insulating oil charged degree treatment device, characterized in that: Used to control the ester-based insulating oil charged degree treatment device according to any one of claims 6 to 8, the control method comprises: Ester-based insulating oils are obtained from transformers; Controlling the ester-based insulating oil to generate a test charge through friction, and obtaining the charge degree of the ester-based insulating oil by detecting the test charge; The ester-based insulating oil is subjected to a circulating purification treatment to reduce the degree of charge of the ester-based insulating oil.

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