CN112990664A - Method for evaluating fire resistance of transformer insulating material - Google Patents
Method for evaluating fire resistance of transformer insulating material Download PDFInfo
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- CN112990664A CN112990664A CN202110172373.7A CN202110172373A CN112990664A CN 112990664 A CN112990664 A CN 112990664A CN 202110172373 A CN202110172373 A CN 202110172373A CN 112990664 A CN112990664 A CN 112990664A
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06Q—INFORMATION AND COMMUNICATION TECHNOLOGY [ICT] SPECIALLY ADAPTED FOR ADMINISTRATIVE, COMMERCIAL, FINANCIAL, MANAGERIAL OR SUPERVISORY PURPOSES; SYSTEMS OR METHODS SPECIALLY ADAPTED FOR ADMINISTRATIVE, COMMERCIAL, FINANCIAL, MANAGERIAL OR SUPERVISORY PURPOSES, NOT OTHERWISE PROVIDED FOR
- G06Q10/00—Administration; Management
- G06Q10/06—Resources, workflows, human or project management; Enterprise or organisation planning; Enterprise or organisation modelling
- G06Q10/063—Operations research, analysis or management
- G06Q10/0639—Performance analysis of employees; Performance analysis of enterprise or organisation operations
- G06Q10/06393—Score-carding, benchmarking or key performance indicator [KPI] analysis
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N25/00—Investigating or analyzing materials by the use of thermal means
- G01N25/20—Investigating or analyzing materials by the use of thermal means by investigating the development of heat, i.e. calorimetry, e.g. by measuring specific heat, by measuring thermal conductivity
- G01N25/22—Investigating or analyzing materials by the use of thermal means by investigating the development of heat, i.e. calorimetry, e.g. by measuring specific heat, by measuring thermal conductivity on combustion or catalytic oxidation, e.g. of components of gas mixtures
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N31/00—Investigating or analysing non-biological materials by the use of the chemical methods specified in the subgroup; Apparatus specially adapted for such methods
- G01N31/12—Investigating or analysing non-biological materials by the use of the chemical methods specified in the subgroup; Apparatus specially adapted for such methods using combustion
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F16/00—Information retrieval; Database structures therefor; File system structures therefor
- G06F16/20—Information retrieval; Database structures therefor; File system structures therefor of structured data, e.g. relational data
- G06F16/24—Querying
- G06F16/245—Query processing
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06Q—INFORMATION AND COMMUNICATION TECHNOLOGY [ICT] SPECIALLY ADAPTED FOR ADMINISTRATIVE, COMMERCIAL, FINANCIAL, MANAGERIAL OR SUPERVISORY PURPOSES; SYSTEMS OR METHODS SPECIALLY ADAPTED FOR ADMINISTRATIVE, COMMERCIAL, FINANCIAL, MANAGERIAL OR SUPERVISORY PURPOSES, NOT OTHERWISE PROVIDED FOR
- G06Q10/00—Administration; Management
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y04—INFORMATION OR COMMUNICATION TECHNOLOGIES HAVING AN IMPACT ON OTHER TECHNOLOGY AREAS
- Y04S—SYSTEMS INTEGRATING TECHNOLOGIES RELATED TO POWER NETWORK OPERATION, COMMUNICATION OR INFORMATION TECHNOLOGIES FOR IMPROVING THE ELECTRICAL POWER GENERATION, TRANSMISSION, DISTRIBUTION, MANAGEMENT OR USAGE, i.e. SMART GRIDS
- Y04S10/00—Systems supporting electrical power generation, transmission or distribution
- Y04S10/50—Systems or methods supporting the power network operation or management, involving a certain degree of interaction with the load-side end user applications
Abstract
The invention discloses a method for evaluating the fire resistance of a transformer insulating material, which comprises the following steps: carrying out combustion test on the insulating material to be evaluated to obtain state quantity data; inputting the obtained data of each state quantity into a processor to obtain a membership vector corresponding to each state quantity; forming a state quantity importance matrix according to an importance level scale stored in a first database; obtaining a weight vector based on the state quantity importance matrix, and calculating to obtain an initial score value of the insulating material; obtaining a loss value of an insulating material in the lower transformer under the action of electricity and heat mixing, and matching the loss value with a deduction value stored in a second database to obtain a deduction value corresponding to the loss value; adding the initial score value and the deduction value to obtain a comprehensive score of the fire resistance of the transformer solid insulating material considering the electricity and heat aging effects; the fire resistance of the insulation material is evaluated based on the composite score. The invention can accurately reflect the fire resistance of the solid insulating material.
Description
Technical Field
The invention relates to the technical field of power transmission and transformation equipment, in particular to a method for evaluating the fire resistance of a transformer insulating material.
Background
The transformer is one of the key devices in power transmission, and the state of the transformer affects not only the safe operation of the transformer, but also the stability and reliability of the operation of the power system. The faults of the power transformer caused by factors such as manufacturing, transportation, installation and maintenance quality not only affect the transmission capacity of the power system, but also can cause large-scale power failure of the power system, thereby bringing huge losses to the power system and national economy. With the development of economy in China and the increase of the capacity of a power grid, the failure of a power transformer can cause more serious consequences.
In the event of a transformer failure, the enormous arc energy may cause a fire. Recently, a fire disaster happens in a converter station due to the fault of the oil paper insulating sleeve on the network side, the fire disaster spreads from the converter transformer body to the valve hall, the whole valve hall collapses, and 6 converter transformers, converter valves and other equipment in the same valve hall are on fire; a sleeve on the converter transformer side of a certain converter station fails to catch fire, and the converter transformer is in fire; and a fire disaster happens to HD converter transformer faults of a certain converter station. The converter transformer has a large fire risk, and the direct current system is shut down due to the converter transformer fire, so that great economic loss is directly caused.
The solid insulating material plays an important role in not only playing a role in electrical insulation, but also playing a role in whether the transformer is ignited or not in case of accidents. However, at present, sufficient attention to the combustion performance of the electrical solid insulating material is not paid, and standards, documents and patents related to the evaluation of the combustion performance of the transformer solid insulating material are rarely reported. GB/T5169.16-2017 test for risk of ignition of electrical and electronic products-part 16: test flame 50W horizontal and vertical flame test method provides that a 50W flame is adopted to carry out two tests of vertical combustion and horizontal combustion to evaluate the fire resistance grade of the material. However, the standard is a general criterion, and the evaluated fire resistance grade is relatively extensive, so that the method cannot play a good guiding role in material selection.
Disclosure of Invention
In order to solve the technical problems in the background art, the invention provides a method for evaluating the fire resistance of a transformer insulating material.
In order to achieve the purpose, the technical scheme of the invention is as follows:
a fire resistance assessment method for transformer insulation materials comprises the following steps:
carrying out combustion test on the insulating material to be evaluated to obtain state quantity data;
inputting the obtained data of each state quantity into a processor to obtain a membership vector corresponding to each state quantity;
forming a state quantity importance matrix according to an importance level scale stored in a first database;
obtaining a weight vector based on the state quantity importance matrix, and calculating to obtain an initial score value of the insulating material;
obtaining a loss value of an insulating material in the lower transformer under the action of electricity and heat mixing, and matching the loss value with a deduction value stored in a second database to obtain a deduction value corresponding to the loss value;
adding the initial score value and the deduction value to obtain a comprehensive score of the fire resistance of the transformer solid insulating material considering the electricity and heat aging effects;
the fire resistance of the insulation material is evaluated based on the composite score.
Compared with the prior art, the invention has the beneficial effects that:
the method is suitable for the insulation material selection in the transformer manufacturing stage and the fire resistance evaluation of the transformer solid insulation material for the fire resistance evaluation of the transformer insulation material, and can accurately reflect the fire resistance of the solid insulation material.
Drawings
FIG. 1 is a flow chart of a method for evaluating fire resistance of a transformer insulation according to an embodiment of the present invention;
fig. 2 is a schematic diagram of the evaluation of the fire resistance of the transformer insulating material according to the embodiment of the invention.
Detailed Description
Example (b):
the technical solution of the present invention is further described below with reference to the accompanying drawings and examples.
Referring to fig. 1-2, the method for evaluating the fire resistance of the transformer insulation material provided by the embodiment includes the following steps:
101. carrying out combustion test on the insulating material to be evaluated to obtain state quantity data; the step is mainly used for obtaining the state condition of the insulating material when the insulating material leaves a factory, and is beneficial to the selection of the insulating material in the manufacturing stage of the transformer.
102. And inputting the obtained data of each state quantity into a processor to obtain a membership vector corresponding to each state quantity.
103. A state quantity importance matrix is formed in compliance with an importance level scale stored in a first database.
104. And obtaining a weight vector based on the state quantity importance matrix, and calculating to obtain an initial score value of the insulating material.
105. Obtaining a loss value of an insulating material in the lower transformer under the action of electricity and heat mixing, and matching the loss value with a deduction value stored in a second database to obtain a deduction value corresponding to the loss value; the influence condition of the transformer on the insulating material in operation can be obtained, and the evaluation of the flame retardant property of the insulating material for operating the transformer can be seen
106. And adding the initial score value and the deduction value to obtain the comprehensive score of the fire resistance of the transformer solid insulating material considering the electricity and heat aging effects.
107. The fire resistance of the insulation material is evaluated based on the composite score.
Therefore, the method is suitable for the insulation material type selection in the manufacturing stage of the transformer, is also suitable for the fire resistance evaluation of the transformer solid insulation material for the fire resistance evaluation of the transformer insulation material, and can accurately reflect the fire resistance of the solid insulation material.
Specifically, in step 101, the state quantity data includes: ignition point F and ignition heating time T in oil steam environment1Average combustion rate under burner VFAverage afterflame burning velocity VRAverage oxygen consumption rate OCRAverage yield of carbon monoxide CMPAverage yield of carbon dioxide CDPMass loss ratio WLThe calculated scoring function for each amount of the trait is as follows:
in this way, the value of each state quantity can be accurately calculated by the above calculation method.
Specifically, the inputting the obtained data of each state quantity into the processor to obtain the membership function corresponding to each state quantity includes:
and (3) substituting each state quantity into a corresponding scoring function to score (percent), substituting into the membership function of each grade shown in the following table to obtain 1 x 4 row vector membership of each state quantity corresponding to each state, wherein x represents the scoring value of each state quantity:
that is, the refractory performance of the insulation material is divided into L1、L2、L3、L4Four levels, i.e. V ═ L1、L2、L3、L4}. Specifically, the importance level scale stored in the first database includes:
0.05-0.95 scale of importance level
Specifically, the obtaining of the weight vector based on the state quantity importance matrix and the calculating of the initial score value of the insulating material include:
weight vector wiSatisfies the following conditions:
the score is calculated according to the following formula:
wherein N is the total number of evaluation objects,
weight vector (line) for a certain evaluation object, BiIs a membership matrix of a certain evaluation object,
score vector (column), f for a certain evaluation objectscoreInitial scoring of the insulation material, wherein the scoring is measured as L1、L2、L3、L4The four levels yield intermediate numbers between the zones.
Specifically, the calculation method of the loss value of the insulating material in the lower transformer for electricity and heat mixed use is as follows:
wherein T is the accumulated time (h) of the winding at 60 ℃ and above, T2For the operation life, the voltage components of k1, k2 and k3 are 50hz, 150hz and 250 hz.
The loss value of the insulating material in the transformer and the deduction value stored in the second database have the following criteria:
evaluating the fire resistance of the insulation based on the composite score includes:
in the L1 grade, the fire resistance of the insulating material is rated from 0 to 40, and the insulating material needs to be immediately overhauled or completely replaced;
in the L2 grade, the fire resistance of the insulating material is graded to be 41-70 points, and minor repair or partial replacement needs to be arranged as soon as possible;
the grade L3, the fire resistance rating of the insulating material is 71-88, and the insulating material needs to be maintained preferentially or evaluated as a common qualified material;
the grade L4, the fire resistance rating of the insulating material is 89-100, and the insulating material can be maintained for a long time or evaluated as a qualified material
The invention is further described in detail below with reference to an application scenario example:
the numerical value of the state quantity of the solid insulating material with the operation voltage of 500kV of a certain high-end converter transformer is shown in the following table. The transformer operates. T is 87h, T is 3.7 years, k1 is 0.99, k3 is 0.003 and k5 is 0.0007.
Numerical value of state quantity
Calculating the state quantity score according to the state quantity value and the score function
Calculating membership degree matrix of various materials
Membership matrix
Medium density paperboard weight vector: (0.135,0.119,0.107,0.119,0.133,0.127,0.105,0.155).
Weight vector of high density paperboard: (0.129,0.101,0.117,0.139,0.133,0.127,0.121,0.133).
Laminated paperboard weight vector: (0.111,0.111,0.107,0.131,0.139,0.106,0.121,0.183).
Shaped insulator weight vector: (0.195,0.093,0.103,0.107,0.121,0.105,0.121,0.155).
Corrugated board weight vector: (0.205,0.092,0.103,0.095,0.127,0.117,0.126,0.135).
The medium density paperboard scoring is (0.761658, 0.29603, 0, 0) (94.5, 79.5, 55.5, 20) and T is 95.511066
High density board score is (weight vector membership matrix) (score vector) (0.836305, 0.15259, 0, 0) (94.5, 79.5, 55.5, 20) T (91.1617275)
The laminated paperboard is scored as weight vector membership matrix (0.844751, 0.037185, 0.109668, 0) (94.5, 79.5, 55.5, 20) T (88.871307)
The molded insulation is scored as a weight vector membership matrix (0.766218, 0.26801, 0, 0) (94.5, 79.5, 55.5, 20) T93.714396
The corrugated cardboard is scored as (weight vector membership matrix) (score vector) (0.933419, 0.105714, 0, 0) (94.5, 79.5, 55.5, 20) T ═ 96.6123585
The solid insulating material is classified into the following components in the factory: 0.2 × 95.511066+0.2 × 91.1617275+0.2 × 88.871307+0.2 × 93.714396+0.2 × 96.6123585 ═ 93.174171, belongs to the excellent { L4} grade, and belongs to the selected excellent qualified material.
Under the combined action of electric heat: (loss) 0.3995 to obtain a score of-1.
Finally, the on-load transformer solid insulation material was found to be 92.174171 points. Belongs to the superior L4 grade and can be repaired in a proper delay way.
The above embodiments are only for illustrating the technical concept and features of the present invention, and the purpose thereof is to enable those skilled in the art to understand the contents of the present invention and implement the present invention accordingly, and not to limit the protection scope of the present invention accordingly. All equivalent changes or modifications made in accordance with the spirit of the present disclosure are intended to be covered by the scope of the present disclosure.
Claims (10)
1. A method for evaluating the fire resistance of a transformer insulating material is characterized by comprising the following steps:
carrying out combustion test on the insulating material to be evaluated to obtain state quantity data;
inputting the obtained data of each state quantity into a processor to obtain a membership vector corresponding to each state quantity;
forming a state quantity importance matrix according to an importance level scale stored in a first database;
obtaining a weight vector based on the state quantity importance matrix, and calculating to obtain an initial score value of the insulating material;
obtaining a loss value of an insulating material in the lower transformer under the action of electricity and heat mixing, and matching the loss value with a deduction value stored in a second database to obtain a deduction value corresponding to the loss value;
adding the initial score value and the deduction value to obtain a comprehensive score of the fire resistance of the transformer solid insulating material considering the electricity and heat aging effects;
the fire resistance of the insulation material is evaluated based on the composite score.
2. The method for assessing the fire resistance of a transformer insulation material according to claim 1, wherein the state quantity data includes: ignition point F and ignition heating time T in oil steam environment1Average combustion rate under burner VFAverage afterflame burning velocity VRAverage oxygen consumption rate OCRAverage yield of carbon monoxide CMPAverage yield of carbon dioxide CDPMass loss ratio WL。
3. The method for evaluating the fire resistance of the transformer insulation material according to claim 2, wherein the score of the ignition point F in the oil vapor environment is calculated by the formula:
the ignition heating time T1The score calculation formula of (a) is:
average burning rate V under the flame burnerFThe score calculation formula of (a) is:
the average burning rate V of the after flameRThe score calculation formula of (a) is:
4. the method for evaluating the fire resistance of the transformer insulation material according to claim 2 or 3, wherein the average oxygen consumption rate OCRThe score calculation formula of (a) is:
the average yield of carbon monoxide CMPThe score calculation formula of (a) is:
average yield C of carbon dioxideDPThe score calculation formula of (a) is:
the mass loss ratio WLThe score calculation formula of (a) is:
5. the method for evaluating fire resistance of transformer insulation according to claim 4, wherein the inputting the obtained data of each state quantity into the processor to obtain the membership vector corresponding to each state quantity comprises:
and (3) substituting each state quantity into a corresponding scoring function for scoring, and substituting the scoring function into the membership function of each grade shown in the following table to obtain the membership degree of 1 x 4 row vectors corresponding to each state of each state quantity, wherein x represents the scoring value of each state quantity:
6. the method of claim 5, wherein the first database stores a scale of importance levels comprising:
0.05-0.95 scale of importance level
7. The method according to claim 6, wherein the obtaining of the initial value of the insulation material by calculation based on the state quantity importance matrix is a weight vector comprises:
weight vector wiSatisfies the following conditions:
the score is calculated according to the following formula:
wherein N is an evaluation pairSuch as the total number of the components,
a weight vector for a certain evaluation object, BiIs a membership matrix of a certain evaluation object,
a score vector for a certain evaluation object, fscoreInitial scoring of the insulation material, wherein the scoring is measured as L1、L2、L3、L4The four levels yield intermediate numbers between the zones.
8. The method for evaluating the fire resistance of the transformer insulation material according to claim 7, wherein the loss value of the transformer insulation material under the action of the electric and thermal combination is calculated by:
wherein T is the accumulated time (h) of the winding at 60 ℃ and above, T2For the operation life, the voltage components of k1, k2 and k3 are 50hz, 150hz and 250 hz.
9. The method for evaluating the fire resistance of the transformer insulation according to claim 8, wherein the loss value of the transformer insulation and the deduction value stored in the second database have the following criteria:
。
10. The method of claim 9, wherein the evaluating the insulation refractory based on the composite score comprises:
the fire resistance of the insulating material is graded to be 0-40 min, and the insulating material needs to be immediately overhauled or completely replaced;
the fire resistance of the insulating material is graded to be 41-70 points, and minor repair or partial replacement needs to be arranged as soon as possible;
the fire resistance of the insulating material is graded to 71-88 points, and the insulating material needs to be maintained preferentially or evaluated as a common qualified material;
the fire resistance of the insulating material is 89-100 points, and the insulating material can be maintained for a long time or evaluated as a qualified material.
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