Transformer fire risk assessment method, processor and readable storage medium

Abstract

The present invention discloses a transformer fire risk assessment method, a processor and a readable storage medium. The transformer fire risk assessment method includes: obtaining the oil quality parameters and temperature of the insulating oil in the transformer, determining the first fire probability according to the oil quality parameters and the temperature, obtaining the oxygen concentration in the insulating oil, determining the second fire probability according to the oxygen concentration, calculating the comprehensive fire probability of the transformer according to the first fire probability, the second fire probability and the fire weight coefficient, and determining the fire risk level of the transformer according to the comprehensive fire probability. Through the above technical scheme, the comprehensive fire probability of the transformer can be quantitatively calculated by comprehensively considering the ignition characteristics of the insulating oil and gas in the transformer, so as to scientifically assess the probability of the transformer fire, ensure the credibility of the fire risk level determined according to the comprehensive fire probability, and achieve the purpose of truly and effectively carrying out fire warning and avoiding fire.

Description

Technical Field

[0001] The present invention belongs to the technical field of power engineering and fire risk assessment, and in particular relates to a transformer fire risk assessment method, a processor and a readable storage medium. Background Art

[0002] Fire is one of the most serious types of transformer failures. Transformer fires not only cause serious damage to equipment, but also affect nearby electrical equipment, causing serious damage to substations, and even seriously threatening the personal safety of operation and maintenance personnel. Although the probability of transformer fires is low, once they occur, they will have serious consequences, and as the voltage level gradually increases, the consequences and losses caused by transformer fires will become more serious.

[0003] Since transformer fires are mostly sudden failures, the power industry has taken a lot of fire prevention measures to reduce the losses caused by transformer fires. In addition, there is no effective means to predict the potential fire risk according to the operating status of the transformer, and to timely warn and take preventive measures to reduce the probability of transformer fires. Although some studies on the occurrence and development mechanism of fires caused by transformer failures have been carried out at home and abroad, due to the very complex relationship between transformer status data and fault (such as fire) risks, there is still a lack of corresponding comprehensive evaluation methods and fire fault classification algorithms. Therefore, it is urgent to provide a transformer fire risk assessment method that can scientifically assess the probability of transformer fires, so as to provide fire warnings and avoid fires. Summary of the invention

[0004] In view of the above-mentioned defects or shortcomings of the prior art, the present invention provides a transformer fire risk assessment method, a processor and a readable storage medium, aiming to solve the technical problem in the prior art that fire warning cannot be performed due to the lack of a method for assessing the probability of a transformer fire.

[0005] In order to achieve the above object, the first aspect of the present invention provides a method for assessing transformer fire risk, wherein the method for assessing transformer fire risk comprises:

[0006] Obtain the oil quality parameters and temperature of the insulating oil in the transformer;

[0007] Determine the first fire probability based on oil quality parameters and temperature;

[0008] Obtain oxygen concentration in insulating oil;

[0009] Determine the second fire probability based on the oxygen concentration;

[0010] The comprehensive fire probability of the transformer is calculated based on the first fire probability, the second fire probability and the fire weight coefficient;

[0011] Determine the fire risk level of the transformer based on the comprehensive fire probability.

[0012] In the embodiment of the present invention, the oil quality parameters include a quantitative score of water content, a quantitative score of acid value, a quantitative score of dielectric loss, a quantitative score of interfacial tension and a quantitative score of dielectric strength.

[0013] In the embodiment of the present invention, determining the first fire probability according to the oil quality parameter and the temperature includes:

[0014] Obtain oil quality weight coefficient;

[0015] The oil quality factor is calculated based on the quantitative score of water content, the quantitative score of acid value, the quantitative score of dielectric loss, the quantitative score of interfacial tension, the quantitative score of dielectric strength and the oil quality weight coefficient;

[0016] Substitute the oil quality factor and temperature into the insulating oil fire probability formula to calculate the first fire probability.

[0017] In the embodiment of the present invention, the calculation formula of the oil quality factor is:

[0018]

[0019] Among them, F oil_water It is the quantitative fraction of moisture content, in ppm; F oil_acid F is the quantitative fraction of acid value, in mg KOH / g; oil_dielectric_loss F is the quantitative fraction of dielectric loss, in %; oil_tension F is the quantitative fraction of interfacial tension, in mN / m; oil_dielectric_strengh is the quantitative fraction of dielectric strength, the unit is kV; k1, k2, k3, k4 and k5 are oil quality weight coefficients, and k1+k2+k3+k4+k5=1, k1, k2, k3, k4 and k5 are all positive numbers.

[0020] In the embodiment of the present invention, the insulating oil fire probability formula is:

[0021]

[0022] Among them, T oil is the oil temperature, F oil It is an oily factor.

[0023] In an embodiment of the present invention, obtaining the oxygen concentration in the insulating oil includes:

[0024] Obtain the combustible gas content, inert gas content and oxygen content in insulating oil;

[0025] The oxygen concentration is calculated based on the combustible gas content, inert gas content and oxygen content.

[0026] In the embodiment of the present invention, determining the second fire probability according to the oxygen concentration includes:

[0027] Get the preset flammable range;

[0028] The second fire probability is determined based on whether the oxygen concentration is within a preset flammable range.

[0029] In the embodiment of the present invention, the preset flammable range includes a preset flammable lower limit and a preset flammable upper limit, and the calculation formula of the preset flammable lower limit is:

[0030]

[0031] The calculation formula for the preset upper flammable limit is:

[0032]

[0033] Among them, G Fuel is the combustible gas concentration in the transformer, LFL mix is the lower flammable limit of the mixed gas in the transformer, UFL mix is the upper flammable limit of the mixed gas in the transformer, C st is the ratio of the stoichiometric number of the mixed gas in the transformer, LOC mix It is the limiting oxygen concentration of the mixed gas in the transformer.

[0034] In order to achieve the above objective, a second aspect of the present invention provides a processor configured to execute the transformer fire risk assessment method described above.

[0035] In order to achieve the above-mentioned object, the third aspect of the present invention provides a machine-readable storage medium, on which instructions are stored, and when the instructions are executed by a processor, the transformer fire risk assessment method described above is implemented.

[0036] In the above technical scheme, the first fire probability is determined according to the oil quality parameters and temperature of the insulating oil in the transformer, that is, the probability of fire occurrence is evaluated from the ignition characteristics of the insulating oil itself in the transformer, and the second fire probability is determined according to the oxygen concentration, that is, the probability of fire occurrence is further evaluated from the ignition characteristics of the gas in the insulating oil. The comprehensive fire probability of the transformer is calculated according to the first fire probability, the second fire probability and the fire weight coefficient, and the fire risk level of the transformer can be determined by the calculated comprehensive fire probability. The comprehensive fire probability of the transformer can be quantified by combining the ignition characteristics of the insulating oil itself and the gas, so as to scientifically evaluate the probability of transformer fire occurrence, ensure the credibility of the fire risk level determined according to the comprehensive fire probability, and achieve the purpose of truly and effectively carrying out fire warning and avoiding fire.

[0037] Other features and advantages of the embodiments of the present invention will be described in detail in the subsequent detailed description. BRIEF DESCRIPTION OF THE DRAWINGS

[0038] The accompanying drawings are used to provide a further understanding of the embodiments of the present invention and constitute a part of the specification. Together with the following specific implementations, they are used to explain the embodiments of the present invention, but do not constitute a limitation on the embodiments of the present invention. In the accompanying drawings:

[0039] Figure 1 A flowchart of a method for assessing transformer fire risk according to an embodiment of the present invention is schematically shown;

[0040] Figure 2 A flowchart schematically shows step 200 of a method for assessing transformer fire risk according to an embodiment of the present invention;

[0041] Figure 3 A flowchart schematically shows step 300 of a method for assessing transformer fire risk according to an embodiment of the present invention;

[0042] Figure 4 The flowchart of step 400 in the method for assessing transformer fire risk according to an embodiment of the present invention is schematically shown. DETAILED DESCRIPTION

[0043] The specific implementation of the embodiment of the present invention is described in detail below in conjunction with the accompanying drawings. It should be understood that the specific implementation described here is only used to illustrate and explain the embodiment of the present invention, and is not used to limit the embodiment of the present invention.

[0044] It should be noted that if the implementation methods of the present application involve directional indications (such as up, down, left, right, front, back...), such directional indications are only used to explain the relative position relationship, movement status, etc. between the components under a certain specific posture (as shown in the accompanying drawings). If the specific posture changes, the directional indication will also change accordingly.

[0045] In addition, if there are descriptions involving "first", "second", etc. in the implementation methods of this application, the descriptions of "first", "second", etc. are only used for descriptive purposes and cannot be understood as indicating or suggesting their relative importance or implicitly indicating the number of technical features indicated. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In addition, the technical solutions between the various implementation methods can be combined with each other, but they must be based on the ability of ordinary technicians in the field to implement them. When the combination of technical solutions is contradictory or cannot be implemented, it should be deemed that such combination of technical solutions does not exist and is not within the scope of protection required by this application.

[0046] Figure 1 The flowchart of the method for assessing transformer fire risk according to an embodiment of the present invention is schematically shown. Figure 1 As shown, in one embodiment of the present invention, a method for assessing transformer fire risk is provided, wherein the method for assessing transformer fire risk comprises the following steps:

[0047] Step 100, obtaining the oil quality parameters and temperature of the insulating oil in the transformer.

[0048] Specifically, the insulating oil can be first taken out from the oil tank of the transformer, and then the oil quality parameters and temperature of the insulating oil can be obtained through various instruments.

[0049] Step 200, determining a first fire probability according to oil quality parameters and temperature.

[0050] Specifically, the first fire probability can be calculated by substituting the oil quality parameter and temperature into a preset calculation formula. Of course, the present invention is not limited thereto, and a table can be preset to obtain the corresponding first fire probability by looking up the table according to the oil quality parameter and temperature.

[0051] Step 300, obtaining the oxygen concentration in the insulating oil.

[0052] Specifically, the oxygen concentration in the mixed gas in the insulating oil can be measured by an instrument.

[0053] Step 400: determining a second fire probability according to the oxygen concentration.

[0054] Step 500, calculating the comprehensive fire probability of the transformer according to the first fire probability, the second fire probability and the fire weight coefficient.

[0055] Step 600, determining the fire risk level of the transformer according to the comprehensive fire probability.

[0056] In the above technical solution, the first fire probability is determined according to the oil quality parameters and temperature of the insulating oil in the transformer, that is, the probability of fire occurrence is evaluated from the ignition characteristics of the insulating oil itself in the transformer, and the second fire probability is determined according to the oxygen concentration, that is, the probability of fire occurrence is further evaluated from the ignition characteristics of the gas in the insulating oil. The comprehensive fire probability of the transformer is calculated according to the first fire probability, the second fire probability and the fire weight coefficient, and the fire risk level of the transformer can be determined by the calculated comprehensive fire probability. The comprehensive fire probability of the transformer can be quantitatively calculated by combining the ignition characteristics of the insulating oil itself and the gas, so as to scientifically evaluate the probability of transformer fire occurrence, ensure the credibility of the fire risk level determined according to the comprehensive fire probability, and achieve the purpose of truly and effectively carrying out fire warning and avoiding fire. It should be particularly noted that the present invention does not limit the order of step 100 and step 300.

[0057] In the embodiment of the present invention, the oil quality parameters include a quantitative fraction of water content, a quantitative fraction of acid value, a quantitative fraction of dielectric loss, a quantitative fraction of interfacial tension, and a quantitative fraction of dielectric strength. Specifically, the quantitative parameter of water content can be obtained by oil and gas chromatography, the quantitative fraction of acid value can be obtained by acid value measuring instrument, the quantitative fraction of dielectric loss can be obtained by dielectric loss meter, the quantitative fraction of interfacial tension can be obtained by surface tension meter, and the quantitative fraction of dielectric strength can be obtained by dielectric strength meter, so that a variety of oil quality parameters are integrated to further ensure the credibility of the determined first fire probability.

[0058] Figure 2 The flowchart schematically shows step 200 of a method for assessing transformer fire risk according to an embodiment of the present invention. Figure 2 As shown, in the embodiment of the present invention, step 200, determining the first fire probability according to the oil quality parameter and the temperature includes:

[0059] Step 201, obtaining oil quality weight coefficient.

[0060] Step 202, calculating the oil quality factor according to the quantified score of water content, the quantified score of acid value, the quantified score of dielectric loss, the quantified score of interfacial tension, the quantified score of dielectric strength and the oil quality weight coefficient.

[0061] Step 203: Substitute the oil quality factor and the temperature into the insulating oil fire probability formula to calculate a first fire probability.

[0062] Specifically, the five oil quality parameters, namely, the quantitative score of moisture content, the quantitative score of acid value, the quantitative score of dielectric loss, the quantitative score of interfacial tension and the quantitative score of dielectric strength, are respectively preset with oil quality weight coefficients k1, k2, k3, k4 and k5, and k1+k2+k3+k4+k5=1, and k1, k2, k3, k4 and k5 are all positive numbers, so that different oil quality weight coefficients can be set for different oil quality parameters to accurately evaluate the influence of different oil quality parameters on the probability of fire. At the same time, by using the insulating oil fire probability formula to calculate the first fire probability, the determination of the first fire probability is more convenient and quick.

[0063] In the embodiment of the present invention, the calculation formula of the oil quality factor is:

[0064]

[0065] Among them, F oil_water It is the quantitative fraction of moisture content, in ppm; F oil_acid F is the quantitative fraction of acid value, in mg KOH / g; oil_dielectric_loss F is the quantitative fraction of dielectric loss, in %; oil_tension F is the quantitative fraction of interfacial tension, in mN / m; oil_dielectric_strengh is the quantitative fraction of dielectric strength, the unit is kV; k1, k2, k3, k4 and k5 are oil quality weight coefficients, and k1+k2+k3+k4+k5=1, k1, k2, k3, k4 and k5 are all positive numbers.

[0066] Specifically, k1 = 0.4, k2 = 0.2, k3 = 0.15, k4 = 0.15, k5 = 0.1, then the calculation formula of the oil quality factor can be more specifically:

[0067]

[0068] In the embodiment of the present invention, the insulating oil fire probability formula is:

[0069]

[0070] Among them, T oil is the oil temperature, F oil is the oil quality factor. Then the oil quality factor and temperature can be substituted into the insulating oil fire probability formula to calculate the first fire probability. It should be noted that the insulating oil fire probability formula in the embodiment of the present invention is determined through repeated derivation and demonstration and multiple test verifications, which can well ensure the credibility of the first fire probability.

[0071] Figure 3 The flowchart of step 300 in the method for assessing transformer fire risk according to an embodiment of the present invention is schematically shown. Figure 3 As shown, in the embodiment of the present invention, step 300, obtaining the oxygen concentration in the insulating oil includes:

[0072] Step 301, obtaining the combustible gas content, the inert gas content and the oxygen content in the insulating oil.

[0073] Specifically, the combustible gas content, inert gas content and oxygen content in the transformer can be detected by oil gas chromatography.

[0074] Step 302, calculating the oxygen concentration according to the combustible gas content, the inert gas content and the oxygen content.

[0075] Specifically, the oxygen concentration may be a ratio of the oxygen content to the sum of the combustible gas content, the inert gas content and the oxygen content. In addition, the combustible gas concentration may be a ratio of the combustible gas content to the sum of the combustible gas content, the inert gas content and the oxygen content. The inert gas concentration may be a ratio of the inert gas content to the sum of the combustible gas content, the inert gas content and the oxygen content. At the same time, the combustible gas concentration, the inert gas concentration and the oxygen concentration may be expressed in G respectively. Fuel , G Nitrogen and G Oxygen express.

[0076] Figure 4 The flowchart of step 400 in the transformer fire risk assessment method according to an embodiment of the present invention is schematically shown. Figure 4 As shown, in the embodiment of the present invention, step 400, determining the second fire probability according to the oxygen concentration includes:

[0077] Step 401, obtaining a preset flammable range.

[0078] Step 402, determining a second fire probability according to whether the oxygen concentration is within a preset flammable range.

[0079] Specifically, if the oxygen concentration is within the preset flammable range, the second fire probability can be determined to be 80%; if the oxygen concentration is not within the preset flammable range, the second fire probability can be determined to be 30%. Of course, the present invention is not limited to this, and the second fire probability can also be other appropriate values. It is mainly to determine whether the oxygen concentration has reached the flammable range where fire is prone to occur. If it has reached, the probability of fire occurrence is relatively large, so a higher second fire probability can be determined. If it has not reached, the probability of fire occurrence is relatively small, so a lower second fire probability can be determined.

[0080] In the embodiment of the present invention, the preset flammable range includes a preset flammable lower limit and a preset flammable upper limit, and the calculation formula of the preset flammable lower limit is:

[0081]

[0082] The calculation formula for the preset upper flammable limit is:

[0083]

[0084] Among them, G Fuel is the combustible gas concentration in the transformer, LFL mix is the lower flammable limit of the mixed gas in the transformer, UFL mix is the upper flammable limit of the mixed gas in the transformer, C st is the ratio of the stoichiometric number of the mixed gas in the transformer, LOC mix It is the limiting oxygen concentration of the mixed gas in the transformer.

[0085] Specifically, LFL mix The calculation formula is:

[0086] UFL mix The calculation formula is:

[0087] C st The calculation formula is: z represents the equivalent moles of O2 divided by the moles of fuel;

[0088] LOC mix The calculation formula is: LOC mix =∑y i z i / ∑y i z i / LOC i , LOC i Represents the LOC of a single compound.

[0089] The LFL involved in the above formulas i Represents the lower flammability limit of a certain combustible gas, UFL i Represents the upper limit of combustion of a certain combustible gas, y i represents the molar fraction of component i in the gas phase (%), Z i Represents the equivalent moles of O2 divided by the fuel moles of compound i in the gas phase.

[0090] In the embodiment of the present invention, step 500, calculating the comprehensive fire probability of the transformer according to the first fire probability, the second fire probability and the fire weight coefficient includes:

[0091] Step 501, obtaining a comprehensive fire probability formula.

[0092] Step 502: Substitute the first fire probability, the second fire probability and the fire weight coefficient into the comprehensive fire probability formula to calculate the comprehensive fire probability of the transformer.

[0093] Specifically, the comprehensive fire probability formula can be:

[0094] Risk fire =t1×Risk air (T oil ,F oil )+t2×Risk Lean oxygen ;

[0095] Wherein, t1 and t2 are fire weight coefficients. Specifically, t1 can be 30% and t2 can be 70%. Then the comprehensive fire probability formula can also be:

[0096] Risk fire =30%×Risk air (T oil ,F oil )+70%×Risk Lean oxygen .

[0097] In an embodiment of the present invention, the fire risk level can be divided into three levels: A, B and C. Level C is a low risk level, and the corresponding comprehensive fire probability is below 30%; Level B is a medium risk level, and the corresponding comprehensive fire probability is above 30% and below 60%; Level A is a high risk level, and the corresponding comprehensive fire probability is above 60%.

[0098] Specifically, specific numerical values ​​will be substituted to calculate and illustrate the comprehensive fire probability of the transformer.

[0099] (1) When the oil quality factor is calculated to be 40 according to the oil quality parameters in the transformer insulating oil utilization table and the calculation formula of the oil quality factor, and the temperature of the insulating oil in the transformer is 85°C as detected by the temperature detection instrument, the first fire probability can be calculated according to the insulating oil fire probability formula:

[0100]

[0101] This indicates that the transformer is operating normally and is not prone to fire.

[0102] If the insulating oil overheats at this time, and the temperature of the insulating oil at the overheat point is 130°C, then the first fire probability of the overheat point is:

[0103]

[0104] This means that if the insulating oil at the hot spot leaks, combined with other uncertain external conditions (arc discharge), a fire is likely to occur.

[0105] (2) When the flammable content of dissolved gas in a certain insulating oil is 14.04 ppm, including 2.07 ppm methane (14.72%), 2.09 ppm methanol (14.87%), 0.68 ppm ethane (4.85%), 1.10 ppm ethylene (7.85%), 3.11 ppm acetylene (22.17%), 4.32 ppm propane (30.77%), and 0.67 ppm propylene (4.77%), by consulting the corresponding flammable upper and lower limits of each component, the flammable upper and lower limits of the mixed gas are:

[0106]

[0107]

[0108] Therefore, the lower flammable limit of the mixed gas can be calculated to be 2.79% and the upper flammable limit is 17.19%.

[0109] Similarly, the LOC of the mixed gas can also be calculated example 10.49%, C st-example It is 0.31%.

[0110] At this point, knowing that the oxygen and nitrogen test quantities in the insulating oil in the transformer are 2ppm and 10ppm respectively, then G Fuel =53.92%, G Oxygen =7.68%. According to the calculation formula of the preset lower flammable limit and the preset upper flammable limit, we can get:

[0111]

[0112]

[0113] but According to Risk Lean oxygen =30%, indicating that fire is unlikely to occur at this time.

[0114] If a transformer fails and air infiltration occurs, causing the oxygen and nitrogen test levels in the transformer oil to become 10ppm and 20ppm, then G Fuel =31%, G Oxygen =22.7%. Recalculating according to the calculation formula of the preset lower flammable limit and the preset upper flammable limit yields:

[0115]

[0116]

[0117] At this time, G Oxygen =22.7%∈[G LFL ,GUFL ], then Risk Lean oxygen =80%, there is a high possibility of fire.

[0118] (3) Calculate the comprehensive fire probability of the transformer and determine the fire risk level of the transformer

[0119] In summary, if the first fire probability is 77.75% and the second fire probability is 80%, then according to the calculation formula of the comprehensive fire probability, we can get:

[0120] Risk fire =30%×Risk air (T oil ,F oil )+70%×Risk Lean oxygen

[0121] =77.75%×30%+70%×80%

[0122] =79.325%

[0123] Since the comprehensive fire probability is calculated to be 79.325%, which is above 60%, it is determined to be a high-risk level A. At this time, the alarm can be controlled to give a warning, so that manual intervention can be carried out in time to avoid the occurrence of fire.

[0124] Another embodiment of the present invention provides a processor configured to execute the transformer fire risk assessment method described above.

[0125] In yet another embodiment of the present invention, a machine-readable storage medium is provided, on which instructions are stored. When the instructions are executed by a processor, the transformer fire risk assessment method described above is implemented.

[0126] Those skilled in the art will appreciate that the embodiments of the present application may be provided as methods, systems, or computer program products. Therefore, the present application may adopt the form of a complete hardware embodiment, a complete software embodiment, or an embodiment in combination with software and hardware. Moreover, the present application may adopt the form of a computer program product implemented in one or more computer-usable storage media (including but not limited to disk storage, CD-ROM, optical storage, etc.) that include computer-usable program code.

[0127] The present application is described with reference to the flowcharts and / or block diagrams of the methods, devices (systems), and computer program products according to the embodiments of the present application. It should be understood that each process and / or box in the flowchart and / or block diagram, as well as the combination of the processes and / or boxes in the flowchart and / or block diagram, can be implemented by computer program instructions. These computer program instructions can be provided to a processor of a general-purpose computer, a special-purpose computer, an embedded processor, or other programmable data processing device to generate a machine, so that the instructions executed by the processor of the computer or other programmable data processing device generate instructions for implementing the processes in the flowchart and / or block diagram. Figure 1 A process or multiple processes and / or boxes Figure 1 A device that provides the functions specified in a block or multiple blocks.

[0128] These computer program instructions may also be stored in a computer readable memory capable of directing a computer or other programmable data processing device to operate in a specific manner, so that the instructions stored in the computer readable memory produce an article of manufacture including an instruction device, which implements the process Figure 1 A process or multiple processes and / or boxes Figure 1 A function specified in one or more boxes.

[0129] These computer program instructions can also be loaded onto a computer or other programmable data processing device so that a series of operating steps are executed on the computer or other programmable device to produce a computer-implemented process, thereby providing instructions for implementing the process. Figure 1 A process or multiple processes and / or boxes Figure 1 The steps for the functions specified in one or more boxes.

[0130] In a typical configuration, a computing device includes one or more processors (CPU), input / output interfaces, network interfaces, and memory.

[0131] The memory may include non-permanent memory in a computer-readable medium, random access memory (RAM) and / or non-volatile memory in the form of read-only memory (ROM) or flash RAM. The memory is an example of a computer-readable medium.

[0132] Computer readable media include permanent and non-permanent, removable and non-removable media that can be implemented by any method or technology to store information. Information can be computer readable instructions, data structures, program modules or other data. Examples of computer storage media include, but are not limited to, phase change memory (PRAM), static random access memory (SRAM), dynamic random access memory (DRAM), other types of random access memory (RAM), read-only memory (ROM), electrically erasable programmable read-only memory (EEPROM), flash memory or other memory technology, compact disk read-only memory (CD-ROM), digital versatile disk (DVD) or other optical storage, magnetic cassettes, magnetic tape magnetic disk storage or other magnetic storage devices or any other non-transmission media that can be used to store information that can be accessed by a computing device. As defined herein, computer readable media does not include temporary computer readable media (transitory media), such as modulated data signals and carrier waves.

[0133] It should also be noted that the terms "include", "comprises" or any other variations thereof are intended to cover non-exclusive inclusion, so that a process, method, commodity or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, commodity or device. In the absence of more restrictions, the elements defined by the sentence "comprises a ..." do not exclude the existence of other identical elements in the process, method, commodity or device including the elements.

[0134] The above are only embodiments of the present application and are not intended to limit the present application. For those skilled in the art, the present application may have various changes and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application should be included within the scope of the claims of the present application.

Claims

1. A method for assessing transformer fire risk, characterized in that: The evaluation methods include: Obtaining oil quality parameters and temperature of the insulating oil in the transformer, wherein the oil quality parameters include a quantified fraction of moisture content, a quantified fraction of acid value, a quantified fraction of dielectric loss, a quantified fraction of interfacial tension, and a quantified fraction of dielectric strength; determining a first fire probability according to the oil quality parameter and the temperature; Obtaining the oxygen concentration in the insulating oil; determining a second fire probability based on the oxygen concentration; Calculating a comprehensive fire probability of the transformer according to the first fire probability, the second fire probability and a fire weight coefficient; Determining a fire risk level of the transformer according to the comprehensive fire probability; Determining the first fire probability according to the oil quality parameter and the temperature comprises: Obtain oil quality weight coefficient; The oil quality factor is calculated according to the quantified fraction of moisture content, the quantified fraction of acid value, the quantified fraction of dielectric loss, the quantified fraction of interfacial tension, the quantified fraction of dielectric strength and the oil quality weight coefficient; Calculate the first fire probability according to the oil quality factor and the temperature; Determining the second fire probability according to the oxygen concentration includes: Get the preset flammable range; The second fire probability is determined according to whether the oxygen concentration is within the preset flammable range.

2. The transformer fire risk assessment method according to claim 1, characterized in that: The calculation formula of the oil quality factor is: ； in, F oil_water It is the quantitative fraction of moisture content, in ppm; F oil_acid F is the quantitative fraction of acid value, the unit is mgKOH / g; oil_dielectric_loss It is the quantitative fraction of dielectric loss, the unit is %; F oil_oil_interfacial_tension_tension F is the quantitative fraction of interfacial tension, in mN / m; oil_dielectric_strengh is the quantitative fraction of dielectric strength, the unit is kV; k1, k2, k3, k4 and k5 are oil quality weight coefficients, and k1+k2+k3+k4+k5=1, k1, k2, k3, k4 and k5 are all positive numbers.

3. The transformer fire risk assessment method according to claim 2, characterized in that: Substituting the oil quality factor and the temperature into the following insulating oil fire probability formula to calculate the first fire probability, the insulating oil fire probability formula is: ； in, is the oil temperature, Oil factor.

4. The transformer fire risk assessment method according to any one of claims 1 to 3, characterized in that: The obtaining of the oxygen concentration in the insulating oil comprises: Obtaining the combustible gas content, the inert gas content and the oxygen content in the insulating oil; The oxygen concentration is calculated according to the combustible gas content, the inert gas content and the oxygen content.

5. The transformer fire risk assessment method according to claim 1, characterized in that: The preset flammable range includes a preset flammable lower limit and a preset flammable upper limit. The calculation formula of the preset flammable lower limit is: ； The calculation formula of the preset flammable upper limit is: ； in, is the combustible gas concentration in the transformer, is the lower flammable limit of the mixed gas in the transformer, is the upper flammable limit of the mixed gas in the transformer, is the ratio of the stoichiometric number of the mixed gas in the transformer, It is the limiting oxygen concentration of the mixed gas in the transformer.

6. A processor, characterized in that: The method is configured to execute the transformer fire risk assessment method according to any one of claims 1 to 5.

7. A machine-readable storage medium having instructions stored thereon, characterized in that: When the instructions are executed by the processor, the transformer fire risk assessment method according to any one of claims 1 to 5 is implemented.

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