Synthetic ester insulating oil electrification degree detection device, processing device and control method

Abstract

The invention relates to the technical field of oil flow live line measurement, and discloses a synthetic ester insulating oil electrification degree detection device, a processing device and a control method, the synthetic ester insulating oil electrification degree detection device comprises an oil flow box, an insulating pipeline section, a friction charge separation unit and an electrometer; a top end opening and a bottom end opening are formed in the oil flow box in the vertical direction; the insulating pipeline section is arranged in the oil flow box; wherein the top of the insulating pipeline section is connected with the top end opening, and the bottom of the insulating pipeline section is connected with the bottom end opening; the triboelectric charge separation unit is arranged between the top end opening and the bottom end opening and is fixed in the insulating pipeline section; the triboelectric charge separation unit is used for being in frictional contact with synthetic ester insulating oil to generate test charges; and the electrometer is connected with the triboelectric charge separation unit and is used for detecting the test charge to obtain the electrification degree of the synthetic ester insulating oil. According to the invention, the electrification degree detection precision of the synthetic ester 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 a synthetic ester insulating oil charge degree detection device, a processing device and a control method. Background Art

[0002] As the core equipment for converting energy during power transmission and distribution, power transformers are vital and critical components to ensure the safe operation of equipment. In traditional oil-immersed power transformers, mineral oil is usually used as the working medium. However, this traditional transformer also has some disadvantages, such as its low flash point, poor biodegradability, difficulty in meeting high fire performance requirements, and non-compliance with environmental protection requirements. Environmentally friendly high-flash point ester insulating oil provides a new option for transformer insulation solutions. Ester insulating oils are mainly divided into natural esters and synthetic esters. Both insulating oils have the advantages of biodegradability, high flash point / flash point, and excellent fire safety. At the same time, synthetic esters have superior oxidation stability compared to natural esters.

[0003] At present, the main method for testing the charge of insulating oil is to pass the insulating oil through a charge separator composed of a filter and electrodes on both sides. The insulating oil will be charged after passing through the filter, and the charge will accumulate on the surface of the filter to form a leakage current. The current value can be tested by an electrometer, and then the charge per unit volume of the insulating oil can be calculated. However, the charge separation ability of the existing charge separator filter will gradually decrease during repeated use, and because the synthetic ester insulating oil has a higher viscosity, the service life of the filter will be shorter. In order to maintain the detection accuracy, it needs to be replaced regularly, which is not conducive to on-site portable detection and operation and maintenance; the surface leakage current formed by the accumulated charge on the filter surface will be polarized under the action of the positive and negative polarity ports of the external electrometer, forming a charge transfer channel, but when the filter is constantly flushed by the high-viscosity synthetic ester oil flow, it will affect its surface charge polarization process, thereby affecting the detection accuracy. Summary of the invention

[0004] The invention provides a synthetic ester insulating oil charged degree detection device, a processing device and a control method, which can improve the detection accuracy of the synthetic ester insulating oil charged degree.

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

[0006] In a first aspect, the present invention provides a synthetic ester insulating oil charged degree detection device, comprising: an oil flow box, an insulating pipe section, a friction charge separation unit and an electrometer;

[0007] The oil flow 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 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 friction charge separation unit is arranged between the top opening and the bottom opening and fixed inside the insulating pipe section;

[0010] The triboelectric charge separation unit is used for frictional contact with the synthetic ester insulating oil to generate a test charge;

[0011] The electrometer is connected to the friction charge separation unit and is used to detect the test charge and obtain the charge degree of the synthetic ester insulating oil.

[0012] Further, the triboelectric charge separation unit comprises: a charge probe;

[0013] An oil flow channel is formed between the top opening and the bottom opening;

[0014] The first end of the charge probe is fixed to the inner wall of the insulating pipe section;

[0015] The second end of the charge probe is disposed in the oil flow channel;

[0016] The charge probe is used for frictional contact with the synthetic ester insulating oil to generate a test charge;

[0017] The electrometer is connected to the charge probe and is used to detect the test charge and obtain the charge degree of the synthetic ester insulating oil.

[0018] Furthermore, the charge probe comprises: a copper electrode and a polytetrafluoroethylene film;

[0019] The surface of the copper electrode is covered with the polytetrafluoroethylene film;

[0020] The first end of the copper electrode is fixed to the inner wall of the insulating pipe section;

[0021] The second end of the copper electrode is disposed in the oil flow channel;

[0022] The copper electrode is used for frictional contact with the synthetic ester insulating oil to generate a test charge;

[0023] The electrometer is connected to the copper electrode and is used to detect the test charge and obtain the charge degree of the synthetic ester insulating oil.

[0024] Furthermore, the electrometer is connected to the copper electrode to detect the test charge and obtain the charge degree of the synthetic ester insulating oil, specifically:

[0025] The negative polarity port of the electrometer is connected to the second end of the copper electrode;

[0026] The positive polarity port of the electrometer is suspended in the oil flow channel below the copper electrode.

[0027] Further, the triboelectric charge separation unit further includes: fluorinated silicon dioxide material;

[0028] The fluorinated silicon dioxide material covers the surface of the polytetrafluoroethylene film.

[0029] In a second aspect, the present invention provides a synthetic ester insulating oil charged degree treatment device, comprising: a synthetic ester insulating oil input device connected through an insulating tube, a synthetic ester insulating oil charged degree detection device and a synthetic ester insulating oil charged degree purification device;

[0030] The synthetic ester insulating oil input device comprises a transformer oil outlet valve, a temperature control tank, a first connecting valve, a first discharge box and a second connecting valve which are sequentially connected through an insulating pipe;

[0031] The synthetic ester insulating oil charge degree detection device comprises an oil flow box, an insulating pipe section, a friction charge separation unit and an electrometer; the oil flow 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 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 friction charge separation unit is arranged in the middle of the top opening and the bottom opening, and is fixed inside the insulating pipe section; the friction charge separation unit is used for frictionally contacting with the synthetic ester insulating oil to generate a test charge; the electrometer is connected to the friction charge separation unit, and is used for detecting the test charge to obtain the charge degree of the synthetic ester insulating oil;

[0032] The synthetic ester insulating oil charged 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 an insulating pipe;

[0033] The synthetic ester insulating oil input device is used to obtain the synthetic ester insulating oil from the transformer box, and transmit the synthetic ester insulating oil to the synthetic ester insulating oil charged degree detection device through an insulating pipe;

[0034] The synthetic ester insulating oil charge degree detection device is used to frictionally contact with the synthetic ester insulating oil and generate a test charge, and the charge degree of the synthetic ester insulating oil is obtained by detecting the test charge;

[0035] The synthetic ester insulating oil charge purification device is used for circulatory purification of the synthetic ester insulating oil to reduce the charge of the synthetic ester insulating oil.

[0036] Furthermore, the synthetic ester insulating oil input device further comprises:

[0037] 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 connecting valve and the synthetic ester insulating oil charged degree detection device;

[0038] The flow meter is used to measure the flow rate of synthetic ester insulating oil.

[0039] Furthermore, the synthetic ester insulating oil input device further comprises:

[0040] 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;

[0041] The mechanical stirrer control motor is used to provide power to the mechanical stirrer;

[0042] The mechanical stirrer is used to mix the physical adsorbent and the synthetic ester insulating oil to perform physical adsorption treatment on the synthetic ester insulating oil.

[0043] In a third aspect, the present invention provides a control method for a synthetic ester insulating oil charged degree detection device, which is used to control the synthetic ester insulating oil charged degree detection device as described above, and the control method comprises:

[0044] Control the synthetic ester insulating oil to come into frictional contact with a preset oil drop friction power generation unit to generate a test charge;

[0045] By detecting the test charge, the charge degree of the synthetic ester insulating oil is obtained.

[0046] In a fourth aspect, the present invention provides a control method for a synthetic ester insulating oil charged degree treatment device, which is used to control the synthetic ester insulating oil charged degree treatment device as described above, and the control method comprises:

[0047] synthetic ester insulating oils from transformers;

[0048] Controlling the synthetic ester insulating oil to generate a test charge through friction, and obtaining the charge degree of the synthetic ester insulating oil by detecting the test charge;

[0049] The synthetic ester insulating oil is subjected to a circulating purification treatment to reduce the degree of charge of the synthetic ester insulating oil.

[0050] The synthetic ester insulating oil charge degree detection device of the present invention comprises an oil flow box, an insulating pipe section, a friction charge separation unit and an electrometer. The synthetic ester insulating oil enters the oil flow box through the top of the insulating pipe section. After the synthetic ester insulating oil enters the oil flow box, it frictionally contacts with the friction charge separation unit fixed inside the insulating pipe section, and flows out through the bottom of the insulating pipe section. After the synthetic ester insulating oil frictionally contacts with the friction charge separation unit, a test charge is generated. The electrometer is connected to the friction charge separation unit, and the charge degree of the synthetic ester insulating oil can be obtained by detecting the test charge. The present invention realizes charge separation of the synthetic ester insulating oil based on the friction effect, and then detects the charge degree of the synthetic ester insulating oil, which can effectively improve the detection accuracy of the charge degree of the synthetic ester insulating oil. BRIEF DESCRIPTION OF THE DRAWINGS

[0051] Figure 1 A schematic diagram of a flow chart of an embodiment of a device for detecting the charge level of synthetic ester insulating oil provided by the present invention;

[0052] Figure 2 A schematic diagram of a flow chart of an embodiment of a device for treating charged synthetic ester insulating oil provided by the present invention;

[0053] Figure 3 A schematic diagram of a flow chart of an embodiment of a synthetic ester insulating oil charged input device provided by the present invention;

[0054] Figure 4 A schematic diagram of a flow chart of another embodiment of the device for purifying charged synthetic ester insulating oil provided by the present invention;

[0055] Figure 5 A curve diagram of oil flow charge variation trend provided by an embodiment of the present invention;

[0056] Figure 6 Another oil flow charge variation trend curve diagram provided by an embodiment of the present invention;

[0057] Figure 7 Another oil flow charge variation trend curve diagram provided by an embodiment of the present invention;

[0058] Figure 8 An oleic acid value variation trend curve provided by an embodiment of the present invention;

[0059] Fig. 9 A moisture change trend curve provided by an embodiment of the present invention. DETAILED DESCRIPTION

[0060] 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.

[0061] 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.

[0062] 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.

[0063] like Figure 1 , which is a schematic structural diagram of an embodiment of a device for detecting the charge level of synthetic ester insulating oil provided by the present invention, the device comprises an oil flow box 1, an insulating pipe section 2, a friction charge separation unit 3 and an electrometer 4;

[0064] The oil flow box 1 is provided with a top opening and a bottom opening in the vertical direction;

[0065] The insulating pipe section 2 is arranged inside the oil flow 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;

[0066] The friction charge separation unit 3 is arranged between the top opening and the bottom opening and fixed inside the insulating pipe section 2;

[0067] The triboelectric charge separation unit 3 is used for frictionally contacting with the synthetic ester insulating oil to generate a test charge;

[0068] The electrometer 4 is connected to the friction charge separation unit 3 and is used to detect the test charge and obtain the charge degree of the synthetic ester insulating oil.

[0069] Further, in the embodiment of the present invention, the friction charge separation unit 3 comprises: a charge probe;

[0070] An oil flow channel is formed between the top opening and the bottom opening;

[0071] The first end of the charge probe is fixed to the inner wall of the insulating pipe section;

[0072] The second end of the charge probe is disposed in the oil flow channel;

[0073] The charge probe is used for frictional contact with the synthetic ester insulating oil to generate a test charge;

[0074] The electrometer 4 is connected to the charge probe and is used to detect the test charge and obtain the charge degree of the synthetic ester insulating oil.

[0075] Further, in an embodiment of the present invention, the charge probe comprises: a copper electrode and a polytetrafluoroethylene film;

[0076] The surface of the copper electrode is covered with the polytetrafluoroethylene film;

[0077] The first end of the copper electrode is fixed to the inner wall of the insulating pipe section;

[0078] The second end of the copper electrode is disposed in the oil flow channel;

[0079] The copper electrode is used for frictional contact with the synthetic ester insulating oil to generate a test charge;

[0080] The electrometer is connected to the copper electrode and is used to detect the test charge and obtain the charge degree of the synthetic ester insulating oil.

[0081] Further, in the embodiment of the present invention, the electrometer 4 is connected to the copper electrode to detect the test charge and obtain the charge degree of the synthetic ester insulating oil, specifically:

[0082] The negative polarity port of the electrometer 4 is connected to the second end of the copper electrode;

[0083] The positive polarity port of the electrometer 4 is suspended in the oil flow channel below the copper electrode.

[0084] Further, in an embodiment of the present invention, the triboelectric charge separation unit further includes: a fluorinated silicon dioxide material;

[0085] The fluorinated silicon dioxide material covers the surface of the polytetrafluoroethylene film.

[0086] Specifically, the synthetic ester insulating oil enters the oil flow box through the top of the insulating pipe section, and the synthetic ester insulating oil is in friction contact with the friction charge separation unit 3. The friction charge separation unit 3 includes a charge probe, which is a copper needle wrapped with a polytetrafluoroethylene (PTFE) film. PTFE is a solid dielectric material in solid-liquid friction, while the synthetic ester insulating oil is a dielectric liquid in solid-liquid friction. When the synthetic ester insulating oil passes through the charge probe at a certain flow rate, the synthetic ester insulating oil is in friction contact with the PTFE film. Since the PTFE film is a negative polarity material, the electrostatic induction on the PTFE surface generates negative charges, and the synthetic ester insulating oil carries a large amount of positive charges. The negative polarity port of the electrometer 4 is connected in parallel to the copper material in the charge probes on both sides, and the positive polarity port of the electrometer 4 is directly suspended in the oil flow channel below the charge probe through a lead wire, and is fully in contact with the flow oil passing through the charge probe, and finally forms an external measurement circuit, which can realize the transfer of positive and negative charges in the solid-liquid friction unit to form a current. Test the current value, and if it passes, the oil flow charge degree can be calculated. The solid-liquid friction power generation unit is vertically connected to the relaxation box through the insulating oil pipeline, so that the synthetic ester insulating oil passes through the solid-liquid friction power generation unit while continuing to flow through the relaxation box, so as to fully discharge the charged synthetic ester insulating oil.

[0087] Preferably, the charge probe is fixed inside the insulating pipe section 2. Under the action of the oil flow, the synthetic ester insulating oil entering the solid-liquid friction charge separation unit 3 comes into friction contact with the charge probe, and charge separation occurs. The leakage current I formed by the accumulated charge on the surface of the charge probe within a time t can be measured through the negative polarity port and the positive polarity port of the electrometer 4 connected to the charge probe.

[0088] See also Figure 2-Figure 4 The present invention provides a synthetic ester insulating oil charged degree treatment device, which comprises a synthetic ester insulating oil input device 101, a synthetic ester insulating oil charged degree detection device 102 and a synthetic ester insulating oil charged degree purification device 103 connected through an insulating tube;

[0089] The synthetic ester insulating oil input device 101 includes a transformer oil outlet valve 6, a temperature control tank 8, a first connecting valve 9, a first discharge box 10 and a second connecting valve 11 which are sequentially connected through an insulating pipe 5;

[0090] The synthetic ester insulating oil charged degree detection device 102 comprises an oil flow box 1, an insulating pipe section 2, a friction charge separation unit 3 and an electrometer 4; the oil flow 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 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 friction charge separation unit 3 is arranged in the middle of the top opening and the bottom opening, and is fixed inside the insulating pipe section 2; the friction charge separation unit 3 is used for frictionally contacting with the synthetic ester insulating oil to generate a test charge; the electrometer 4 is connected to the friction charge separation unit 3, and is used for detecting the test charge to obtain the charged degree of the synthetic ester insulating oil;

[0091] The synthetic ester insulating oil charged degree purification device 103 comprises a second discharge box 14, a reaction tank 16, a decanting tank 18, an oil filter tank 19 and a transformer oil inlet valve 21 which are sequentially connected through insulating pipes;

[0092] The synthetic ester insulating oil input device 101 is used to obtain the synthetic ester insulating oil from the transformer box and transmit the synthetic ester insulating oil to the synthetic ester insulating oil charged degree detection device through an insulating pipe;

[0093] The synthetic ester insulating oil charge degree detection device 102 is used for frictionally contacting with the synthetic ester insulating oil and generating a test charge, and obtaining the charge degree of the synthetic ester insulating oil by detecting the test charge;

[0094] The synthetic ester insulating oil charge purification device 103 is used to perform a circulating purification process on the synthetic ester insulating oil to reduce the charge of the synthetic ester insulating oil.

[0095] Furthermore, in the embodiment of the present invention, the synthetic ester insulating oil input device 101 further includes:

[0096] A first circulation pump 7 is provided on the insulating pipe between the transformer oil outlet valve 6 and the temperature control tank 8, and a second circulation pump 12 and a flow meter 13 are provided on the insulating pipe between the second connecting valve 11 and the synthetic ester insulating oil charged degree detection device 102;

[0097] The flow meter 13 is used to measure the flow rate of the synthetic ester insulating oil.

[0098] Furthermore, the synthetic ester insulating oil input device further comprises:

[0099] A third circulation pump 20 is provided on the insulating pipe between the oil filter tank 19 and the transformer oil inlet valve 21; a physical adsorbent, a mechanical stirrer control motor 15 and a mechanical stirrer 17 are provided inside the reaction tank 16;

[0100] The mechanical stirrer control motor 15 is used to provide power to the mechanical stirrer;

[0101] The mechanical stirrer 17 is used to mix the physical adsorbent and the synthetic ester insulating oil to perform physical adsorption treatment on the synthetic ester insulating oil.

[0102] In the embodiment of the present invention, the synthetic ester insulating oil charge degree processing device of the present embodiment is used to accurately evaluate the oil flow charge degree of the synthetic ester insulating oil and purify its charged substances under the condition of transformer live operation by utilizing the friction effect. The entire synthetic ester insulating oil charge degree processing device mainly comprises a synthetic ester insulating oil input device 101, a synthetic ester insulating oil charge degree detection device 102 and a synthetic ester insulating oil charge degree purification device 103, which are connected by an insulating pipe and are respectively connected to the upper and lower oil outlet valves of the transformer box to ensure that the entire synthetic ester insulating oil charge degree processing device forms a closed loop, so that the synthetic ester insulating oil can be circulated and its charge degree can be measured during operation.

[0103] Specifically, the synthetic ester insulating oil input device 101 includes a transformer oil outlet valve 6, a first circulation pump 7, a temperature control tank 8, a first connecting valve 9, a first discharge box 10, a second connecting valve 11, a second circulation pump 12 and a flow meter 13 connected in sequence through an insulating pipe 5. The synthetic ester insulating oil charge detection device 102 includes an oil flow box 1, an insulating pipe section 2, a friction charge separation unit 3 and an electrometer 4. These components are connected in sequence through insulating pipes. The friction charge separation unit 3 uses the sensing characteristics of the solid-liquid friction power generation unit to measure the charge of the synthetic ester insulating oil.

[0104] Preferably, based on the synthetic ester insulating oil input device and the synthetic ester insulating oil detection device, during the test, the transformer box is connected to the insulating pipe 5, and the insulating pipe 5 is connected to the transformer oil outlet valve 6. By controlling the switch of the transformer oil outlet valve 6, the synthetic ester insulating oil flows from the transformer box into the temperature control tank 8 under the action of the first circulation pump 7. The temperature range of the temperature control tank 8 is set at 60-90°C, which is used to control the temperature of the circulating insulating oil to ensure that the insulating oil is in a suitable temperature condition when the charged degree test and physical adsorption treatment are carried out. The synthetic ester insulating oil flowing out of the temperature control tank 8 flows into the first discharge box 10 under the action of the first circulation pump 7. A stainless steel filter is installed in the first discharge box 10 for fully discharging the synthetic ester insulating oil to ensure that the charge in the oil is fully discharged before flowing into the solid-liquid friction charge separation unit 3. The first discharge box 10 cooperates with the second circulation pump 12 through the second connecting valve 11 to control the time t of the synthetic ester insulating oil flowing into the friction charge separation unit 3. At the same time, the flow rate v of the insulating oil entering the friction charge separation unit 3 is measured by the flowmeter 13. By measuring the flow rate v and time t, the volume V of the synthetic ester insulating oil flowing into the friction charge separation unit 3 can be calculated. The charge degree of the synthetic ester is calculated using the following formula:

[0105]

[0106] Where ρ is the charge density in the oil (pC / mL), q is the charge amount of oil-paper charge separation (pC), i is the leakage current (pA), V is the oil sample volume (mL), and t is the measurement time (s).

[0107] In actual measurement, in order to avoid the influence of current fluctuations at the start and end of the measurement, the current value i* at the midpoint of the time can be taken as:

[0108] Specifically, the charged degree purification device 103 of synthetic ester insulating oil comprises a second discharge box 14, a mechanical stirrer control motor 15, a reaction tank 16, a mechanical stirrer 17, a decanting tank 18, an oil filter tank 19, a third circulating pump 20 and a transformer oil inlet valve 21, which are sequentially connected through an insulating pipe. The second discharge box 14 is connected to the reaction tank 16 through an insulating pipe. The synthetic ester insulating oil discharged by the second discharge box 14 flows into the reaction tank 16, and in the reaction tank 16, the synthetic ester insulating oil is purified and adsorbed by a physical adsorbent (such as clay, activated carbon, etc.). The mechanical stirrer 17 controlled by the mechanical stirrer control motor 15 fully mixes the synthetic ester insulating oil with the physical adsorbent. The treated synthetic ester insulating oil flows from the reaction tank 16 into the decanting tank 18, and the decanting tank 18 realizes the solid-liquid separation of the physical adsorbent and the synthetic ester insulating oil. Next, the synthetic ester insulating oil enters the oil filter tank 19, and the small amount of solid reagent in the decanting tank 18 is filtered and separated by the filter membrane in the oil filter tank 19. Ensure that there are no residual physical adsorbents and polar substances in the oil. Finally, the treated synthetic ester insulating oil is returned to the transformer box through the insulating pipe and the third circulating pump 20 to ensure the performance and reliability of the synthetic ester insulating oil in the transformer, and to achieve the optimization effect through the circulating purification treatment. Among them, the flow rate of the synthetic ester insulating oil can be controlled by the transformer oil inlet valve 21, so that the insulating oil returns to the transformer box at a certain flow rate. By regulating the opening degree of the third circulating pump 20 and the transformer oil inlet valve 21, it can be ensured that the flow rate of the synthetic ester insulating oil is within a controllable range, thereby avoiding the problem of oil flow electrification when the insulating oil returns to the box due to excessive circulation flow rate, which helps to maintain the stable state of the insulating oil.

[0109] The synthetic ester insulating oil charge detection device of the present invention introduces a solid-liquid triboelectric effect, which can not only realize real-time measurement of the charge tendency of the running transformer insulating oil, improve its measurement accuracy, and effectively evaluate the charge degree of the oil flow, but also purify and regenerate the transformer synthetic ester insulating oil, thereby suppressing the charge phenomenon of the oil flow to a certain extent.

[0110] In order to facilitate understanding and verify the effect of this solution, the oil flow charge test was conducted during the regeneration process of a synthetic ester insulating oil (400L) of a Southern Power Grid that had been in operation for 10 years. The adsorbent used in the circulation process was activated clay, the circulating insulating oil temperature was controlled at 60°C, and the vacuum pump flow rate was 0.5L / min. Figure 5 It can be seen that at a constant flow rate, the charge of the synthetic ester insulating oil decreases over time. After 12 hours of circulation treatment, the charge of the insulating oil decreases from the initial 213pC / mL to 34pC / mL. Figure 6It can be seen that the decreasing trend of the charge degree of synthetic ester insulating oil changes under different flow rates. Specifically, when the system flow rate increases, the oil charge degree also increases overall, but after 12 hours of circulation treatment, it can also be reduced to less than 50pC / mL. Figure 7 It can be seen that as the temperature of the circulating insulating oil increases, the overall charge of the synthetic ester insulating oil gradually decreases. The reason for this is that as the temperature of the insulating oil increases, the kinematic viscosity of the oil further decreases, and the oil-paper contact friction is smaller, resulting in a decrease in the charge of the oil flow. Figure 8 , 9 It also shows that under the above conditions, during the circulation treatment of synthetic ester insulating oil, the oil acid value and moisture content both show a downward trend, indicating that the polar substances in the oil are an important factor affecting the change of oil charge.

[0111] In one embodiment, the present invention provides a control method for a synthetic ester insulating oil charged degree detection device, which is used to control the synthetic ester insulating oil charged degree detection device as described above, and the control method includes:

[0112] Control the synthetic ester insulating oil to come into frictional contact with a preset oil drop friction power generation unit to generate a test charge;

[0113] By detecting the test charge, the charge degree of the synthetic ester insulating oil is obtained.

[0114] For the specific definition of the control method of a synthetic ester insulating oil live degree detection device, please refer to the above-mentioned definition of a synthetic ester 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 exceed the scope of this application.

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

[0116] synthetic ester insulating oils from transformers;

[0117] Controlling the synthetic ester insulating oil to generate a test charge through friction, and obtaining the charge degree of the synthetic ester insulating oil by detecting the test charge;

[0118] The synthetic ester insulating oil is subjected to a circulating purification treatment to reduce the degree of charge of the synthetic ester insulating oil.

[0119] For the specific definition of the control method of a synthetic ester insulating oil live degree treatment device, please refer to the above-mentioned definition of a synthetic ester 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 exceed the scope of this application.

[0120] In summary, the synthetic ester insulating oil charge degree detection device provided by the embodiment of the present invention includes an oil flow box, an insulating pipe section, a friction charge separation unit and an electrometer. The synthetic ester insulating oil enters the oil flow box through the top of the insulating pipe section. After the synthetic ester insulating oil enters the oil flow box, it frictionally contacts with the friction charge separation unit fixed inside the insulating pipe section, and flows out through the bottom of the insulating pipe section. After the synthetic ester insulating oil frictionally contacts with the friction charge separation unit, a test charge is generated. The electrometer is connected to the friction charge separation unit, and the charge degree of the synthetic ester insulating oil can be obtained by detecting the test charge. The present invention realizes charge separation of the synthetic ester insulating oil based on the friction effect, and then detects the charge degree of the synthetic ester insulating oil, which can effectively improve the detection accuracy of the charge degree of the synthetic ester insulating oil.

[0121] 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. A device for detecting the charge level of synthetic ester insulating oil, characterized in that: include: oil flow boxes, insulated pipe sections, tribocharge separation units, and electrometers; The oil flow 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 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 friction charge separation unit is arranged between the top opening and the bottom opening and fixed inside the insulating pipe section; The triboelectric charge separation unit is used for frictional contact with the synthetic ester insulating oil to generate a test charge; The electrometer is connected to the friction charge separation unit and is used to detect the test charge and obtain the charge degree of the synthetic ester insulating oil.

2. The synthetic ester insulating oil charge detection device according to claim 1, characterized in that: The triboelectric charge separation unit comprises: a charge probe; An oil flow channel is formed between the top opening and the bottom opening; The first end of the charge probe is fixed to the inner wall of the insulating pipe section; The second end of the charge probe is disposed in the oil flow channel; The charge probe is used for frictional contact with the synthetic ester insulating oil to generate a test charge; The electrometer is connected to the charge probe and is used to detect the test charge and obtain the charge degree of the synthetic ester insulating oil.

3. The synthetic ester insulating oil charge detection device according to claim 2, characterized in that: The charge probe comprises: a copper electrode and a polytetrafluoroethylene film; The surface of the copper electrode is covered with the polytetrafluoroethylene film; The first end of the copper electrode is fixed to the inner wall of the insulating pipe section; The second end of the copper electrode is disposed in the oil flow channel; The copper electrode is used for frictional contact with the synthetic ester 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 synthetic ester insulating oil.

4. The synthetic ester 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 synthetic ester insulating oil, specifically: The negative polarity port of the electrometer is connected to the second end of the copper electrode; The positive polarity port of the electrometer is suspended in the oil flow channel below the copper electrode.

5. The synthetic ester insulating oil charge detection device according to claim 3, characterized in that: The triboelectric charge separation unit further includes: a fluorinated silicon dioxide material; The fluorinated silicon dioxide material covers the surface of the polytetrafluoroethylene film.

6. A device for treating charged synthetic ester insulating oil, characterized in that: include: A synthetic ester insulating oil input device, a synthetic ester insulating oil charge detection device and a synthetic ester insulating oil charge purification device connected through an insulating tube; The synthetic ester insulating oil input device comprises a transformer oil outlet valve, a temperature control tank, a first connecting valve, a first discharge box and a second connecting valve which are sequentially connected through an insulating pipe; The synthetic ester insulating oil charge degree detection device comprises an oil flow box, an insulating pipe section, a friction charge separation unit and an electrostatic meter; the oil flow 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 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 friction charge separation unit is arranged in the middle of the top opening and the bottom opening, and is fixed inside the insulating pipe section; The friction charge separation unit is used for frictionally contacting with the synthetic ester insulating oil to generate a test charge; the electrometer is connected to the friction charge separation unit to detect the test charge and obtain the charge degree of the synthetic ester insulating oil; The synthetic ester insulating oil charged 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 an insulating pipe; The synthetic ester insulating oil input device is used to obtain the synthetic ester insulating oil from the transformer box, and transmit the synthetic ester insulating oil to the synthetic ester insulating oil charged degree detection device through an insulating pipe; The synthetic ester insulating oil charge degree detection device is used to frictionally contact with the synthetic ester insulating oil and generate a test charge, and the charge degree of the synthetic ester insulating oil is obtained by detecting the test charge; The synthetic ester insulating oil charge purification device is used for circulatory purification of the synthetic ester insulating oil to reduce the charge of the synthetic ester insulating oil.

7. The device for treating charged synthetic ester insulating oil according to claim 6, characterized in that: The synthetic ester 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 connecting valve and the synthetic ester insulating oil charged degree detection device; The flow meter is used to measure the flow rate of synthetic ester insulating oil.

8. The device for treating charged synthetic ester insulating oil according to claim 6, characterized in that: The synthetic ester insulating oil input device further comprises: 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 synthetic ester insulating oil to perform physical adsorption treatment on the synthetic ester insulating oil.

9. A control method for a synthetic ester insulating oil charged degree detection device, characterized in that: A device for controlling the charge degree detection of synthetic ester insulating oil according to any one of claims 1 to 5, the control method comprising: Control the synthetic ester 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 synthetic ester insulating oil is obtained.

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

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