CN114113924B - Method for evaluating damage degree of short-circuit electrodynamic force to epoxy resin - Google Patents
Method for evaluating damage degree of short-circuit electrodynamic force to epoxy resin Download PDFInfo
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- CN114113924B CN114113924B CN202111232401.6A CN202111232401A CN114113924B CN 114113924 B CN114113924 B CN 114113924B CN 202111232401 A CN202111232401 A CN 202111232401A CN 114113924 B CN114113924 B CN 114113924B
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- 239000003822 epoxy resin Substances 0.000 title claims abstract description 62
- 229920000647 polyepoxide Polymers 0.000 title claims abstract description 62
- 230000005520 electrodynamics Effects 0.000 title claims abstract description 31
- 238000000034 method Methods 0.000 title claims abstract description 10
- 238000002474 experimental method Methods 0.000 claims abstract description 4
- 238000011156 evaluation Methods 0.000 claims description 6
- 238000005259 measurement Methods 0.000 claims description 3
- 239000011810 insulating material Substances 0.000 description 3
- 238000004880 explosion Methods 0.000 description 1
- 238000011056 performance test Methods 0.000 description 1
- 238000010998 test method Methods 0.000 description 1
- 238000012360 testing method Methods 0.000 description 1
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/12—Testing dielectric strength or breakdown voltage ; Testing or monitoring effectiveness or level of insulation, e.g. of a cable or of an apparatus, for example using partial discharge measurements; Electrostatic testing
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Abstract
A method for evaluating the damage degree of short-circuit electrodynamic force to epoxy resin comprises the following steps: firstly, two identical epoxy resin samples are taken, equivalent short-circuit electrodynamic force is applied to one of the epoxy resin samples, the other epoxy resin sample is used for comparison, equivalent short-circuit electrodynamic force is not applied to the epoxy resin samples, then partial discharge experiments are carried out on the two epoxy resin samples, then a discharge frequency difference index, a discharge total energy difference index and a maximum discharge quantity difference index are calculated according to experimental data, and finally a factor for evaluating the damage degree of the short-circuit electrodynamic force to the epoxy resin is calculated.
Description
Technical Field
The invention belongs to the field of performance test of epoxy resin of transformer insulating materials, and particularly relates to a method for evaluating the damage degree of short-circuit electrodynamic force to the epoxy resin.
Background
Because the dry type transformer has the advantages of light weight, difficult explosion, safety and reliability, the dry type transformer is applied more and more in the power industry, the performance requirement of the dry type transformer on the insulating material is continuously developed, and because the epoxy resin has good mechanical and electrical properties, the epoxy resin is often used as the insulating material of the dry type transformer, however, when the transformer suffers from short-circuit fault, the short-circuit electrodynamic force can damage the epoxy resin, so that the mechanical and electrical capabilities of the transformer are reduced, hidden troubles are buried for the safe and stable operation of the transformer, therefore, the capability of the epoxy resin to resist the short-circuit electromotive force needs to be evaluated, and the current test evaluation method does not provide a specific index to quantitatively represent the damage degree of the short-circuit electromotive force to the epoxy resin, therefore, a test and evaluation method is needed to evaluate the damage level of the short circuit electromotive force to the epoxy resin.
Disclosure of Invention
The invention comprises the following steps:
the first step is as follows: taking two identical epoxy resin samples, applying equivalent short-circuit electrodynamic force F to one of the epoxy resin samples, and applying no equivalent short-circuit electrodynamic force to the other epoxy resin sample for comparison;
the second step: the epoxy resin sample applied with equivalent short-circuit electric power and the epoxy resin sample not applied with equivalent short-circuit electric power are subjected to partial discharge experiment, the epoxy resin samples are pressurized by using a step pressure increasing method, and 0.8U is sequentially applied0、1.0U0、1.2U0、1.4U0、1.6U0、1.8U0、2.0U0Voltage of, wherein U0The initial discharge voltage of the epoxy resin sample without the application of the equivalent short-circuit electric force is shown, each voltage level lasts for 5 minutes, and the discharge times N per second of the epoxy resin sample without the application of the equivalent short-circuit electric force is recorded0 tTotal discharge energy W0 tAnd maximum discharge Q0 tRecording the number of times N of discharge per second of the epoxy resin sample applied with equivalent short-circuit electromotive force1 tTotal discharge energy W1 tMaximum discharge capacity Q1 tWhere t denotes measurement time in seconds, t ═ 1, 2, 3 … …, 2100;
the third step: calculating the difference index lambda of the discharge timesNBy (t, N)0 t) Fitting N0 tFunction f in relation to time t0(t) by (t, N)1 t) Fitting N1 tFunction f in relation to time t 1(t) calculating a difference index lambda of the number of discharges according to the formula (1)N，
Wherein f is0' (t) denotes f0(t) a first derivative function with respect to time t, f1' (t) denotes f1(t) a first derivative function with respect to time t;
the fourth step: calculating discharge total energy difference index lambdaWThrough (t, W)0 t) Fitting W0 tFunction g in relation to time t0(t) by (t, W)1 t) Fitting W1 tFunction g with respect to time t1(t) calculating a difference index lambda of the number of discharges according to the formula (2)W，
Wherein g is0' (t) denotes g0(t) a first derivative function with respect to time t, g1' (t) denotes g1(t) a first derivative function with respect to time t; wherein g is0"(t) denotes g0(t) a second derivative function with respect to time t, g1"(t) denotes g1(t) a second derivative function with respect to time t;
the third step: calculating the maximum discharge difference index lambdaQThrough (t, Q)0 t) Fitting Q0 tFunction h with respect to time t0(t) by (t, Q)1 t) Fitting Q1 tFunction h with respect to time t1(t) calculating a difference index lambda of the number of discharges according to the formula (3)Q，
Wherein h is0' (t) denotes h0(t) a first derivative function with respect to time t, h1' (t) denotes h1(t) a first derivative function with respect to time t; wherein h is0"(t) means h0(t) a second derivative function with respect to time t, h1"(t) denotes h1(t) a second derivative function with respect to time t;
the fifth step: calculating the damage degree evaluation factor lambda of the short-circuit electrodynamic force to the epoxy resin,
When lambda is more than 0 and less than or equal to 5.6, the short-circuit electrodynamic force does not damage the epoxy resin sample, when lambda is more than or equal to 5.6 and less than or equal to 10.25, the short-circuit electrodynamic force slightly damages the epoxy resin sample, when lambda is more than or equal to 10.25 and less than or equal to 50, the short-circuit electrodynamic force moderately damages the epoxy resin sample, and when lambda is more than 50, the short-circuit electrodynamic force severely damages the epoxy resin sample.
Drawings
FIG. 1 is a flow chart of a method for evaluating the damage level of short-circuit electromotive force to epoxy resin.
Detailed Description
The invention is further explained by combining the attached drawings and the concrete implementation process, and the evaluation method of the damage degree of the short-circuit electrodynamic force to the epoxy resin comprises the following steps:
the first step is as follows: taking two identical epoxy resin samples, applying equivalent short-circuit electrodynamic force F to one of the epoxy resin samples, and applying no equivalent short-circuit electrodynamic force to the other epoxy resin sample for comparison;
the second step is that: the epoxy resin sample applied with equivalent short-circuit electric power and the epoxy resin sample not applied with equivalent short-circuit electric power are subjected to partial discharge experiment, the epoxy resin samples are pressurized by using a step pressure increasing method, and 0.8U is sequentially applied0、1.0U0、1.2U0、1.4U0、1.6U0、1.8U0、2.0U0Voltage of, wherein U0The initial discharge voltage of the epoxy resin sample without the equivalent short-circuit electromotive force is shown, each voltage level lasts for 5 minutes, and the discharge times N per second of the epoxy resin sample without the equivalent short-circuit electromotive force is recorded 0 tTotal discharge energy W0 tAnd maximum discharge amount Q0 tRecording the number of times N of discharge per second of the epoxy resin sample applied with equivalent short-circuit electromotive force1 tTotal discharge energy W1 tMaximum discharge capacity Q1 tWhere t denotes measurement time in seconds, t is 1, 2, 3 … …, 2100;
the third step: calculating the difference index lambda of the discharge timesNBy (t, N)0 t) Fitting N0 tFunction f in relation to time t0(t) by (t, N)1 t) Fitting N1 tFunction f in relation to time t1(t) calculating a difference index lambda of the number of discharges according to the formula (1)N，
Wherein f is0' (t) denotes f0(t) a first derivative function with respect to time t, f1' (t) denotes f1(t) a first derivative function with respect to time t;
the fourth step: calculating discharge total energy difference index lambdaWThrough (t, W)0 t) Fitting W0 tFunction g in relation to time t0(t) passing (t, W)1 t) Fitting W1 tFunction g in relation to time t1(t) calculating a difference index of the number of discharges lambda according to the formula (2)W，
Wherein g is0' (t) denotes g0(t) a first derivative function with respect to time t, g1' (t) denotes g1(t) a first derivative function with respect to time t; wherein g is0"(t) denotes g0(t) a second derivative function with respect to time t, g1"(t) denotes g1(t) a second derivative function with respect to time t;
the third step: calculating the maximum discharge difference index lambdaQThrough (t, Q) 0 t) Fitting Q0 tFunction h with respect to time t0(t) by (t, Q)1 t) Fitting Q1 tFunction h with respect to time t1(t) calculating a difference index lambda of the number of discharges according to the formula (3)Q，
Wherein h is0' (t) denotes h0(t) a first derivative function with respect to time t, h1' (t) denotes h1(t) a first derivative function with respect to time t; wherein h is0"(t) denotes h0(t) a second derivative function with respect to time t, h1"(t) denotes h1(t) a second derivative function with respect to time t;
the fifth step: calculating the damage degree evaluation factor lambda of the short-circuit electrodynamic force to the epoxy resin,
when lambda is more than 0 and less than or equal to 5.6, the short-circuit electrodynamic force does not damage the epoxy resin sample, when lambda is more than or equal to 5.6 and less than or equal to 10.25, the short-circuit electrodynamic force slightly damages the epoxy resin sample, when lambda is more than or equal to 10.25 and less than or equal to 50, the short-circuit electrodynamic force moderately damages the epoxy resin sample, and when lambda is more than 50, the short-circuit electrodynamic force severely damages the epoxy resin sample.
Claims (1)
1. A method for evaluating the damage degree of short-circuit electrodynamic force to epoxy resin is characterized by comprising the following steps:
the first step is as follows: taking two identical epoxy resin samples, applying equivalent short-circuit electrodynamic force F to one of the epoxy resin samples, and applying no equivalent short-circuit electrodynamic force to the other epoxy resin sample for comparison;
The second step: the epoxy resin sample applied with equivalent short-circuit electric power and the epoxy resin sample not applied with equivalent short-circuit electric power are subjected to partial discharge experiment, the epoxy resin sample is pressurized by using a step-boosting method, and 0.8U is sequentially applied0、1.0U0、1.2U0、1.4U0、1.6U0、1.8U0、2.0U0Voltage of wherein U0The initial discharge voltage of the epoxy resin sample without the application of the equivalent short-circuit electric force is shown, each voltage level lasts for 5 minutes, and the discharge times N per second of the epoxy resin sample without the application of the equivalent short-circuit electric force is recorded0 tTotal discharge energy W0 tAnd maximum discharge Q0 tRecording the number of times N of discharge per second of the epoxy resin sample applied with equivalent short-circuit electromotive force1 tTotal discharge energy W1 tMaximum discharge capacity Q1 tWhere t denotes measurement time in seconds, t is 1, 2, 3 … …, 2100;
the third step: calculating the difference index lambda of the discharge timesNBy (t, N)0 t) Fitting N0 tFunction f in relation to time t0(t) by (t, N)1 t) Fitting N1 tFunction f in relation to time t1(t) calculating a difference index lambda of the number of discharges according to the formula (1)N，
Wherein f is0' (t) denotes f0(t) a first derivative function with respect to time t, f1' (t) denotes f1(t) a first derivative function with respect to time t;
the fourth step: calculating discharge total energy difference index lambda WThrough (t, W)0 t) Fitting W0 tFunction g with respect to time t0(t) by (t, W)1 t) Fitting W1 tFunction g in relation to time t1(t) calculating a difference index of the number of discharges lambda according to the formula (2)W，
Wherein g is0' (t) denotes g0(t) a first derivative function with respect to time t, g1' (t) denotes g1(t) a first derivative function with respect to time t; wherein g is0"(t) denotes g0(t) a second derivative function with respect to time t, g1"(t) denotes g1(t) a second derivative function with respect to time t;
the third step: calculating the maximum discharge difference index lambdaQThrough (t, Q)0 t) Fitting Q0 tFunction h with respect to time t0(t) by (t, Q)1 t) Fitting Q1 tFunction h with respect to time t1(t) calculating a difference index lambda of the number of discharges according to the formula (3)Q，
Wherein h is0' (t) denotes h0(t) a first derivative function with respect to time t, h1' (t) denotes h1(t) a first derivative function with respect to time t; wherein h is0"(t) means h0(t) a second derivative function with respect to time t, h1"(t) denotes h1(t) a second derivative function with respect to time t;
the fifth step: calculating the damage degree evaluation factor lambda of the short-circuit electrodynamic force to the epoxy resin,
when lambda is more than 0 and less than or equal to 5.6, the short-circuit electrodynamic force does not damage the epoxy resin sample, when lambda is more than or equal to 5.6 and less than or equal to 10.25, the short-circuit electrodynamic force slightly damages the epoxy resin sample, when lambda is more than or equal to 10.25 and less than or equal to 50, the short-circuit electrodynamic force moderately damages the epoxy resin sample, and when lambda is more than 50, the short-circuit electrodynamic force severely damages the epoxy resin sample.
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| CN101135789A (en) * | 2007-09-25 | 2008-03-05 | 上海海晶电子有限公司 | Method for resolving breakdown of LCD device electrostatic |
| JP2009238436A (en) * | 2008-03-26 | 2009-10-15 | Yamari Sangyo Kk | Terminal sealing structure of sheath type heater, sheath type heater equipped with it, and terminal sealing method of sheath type heater |
| CN101812217A (en) * | 2010-04-15 | 2010-08-25 | 河南许绝电工绝缘材料有限公司 | Partial discharge resistant epoxy casting resin |
| CN102623151A (en) * | 2011-01-30 | 2012-08-01 | 张家港市沙洲特种变压器制造有限公司 | Stable compressed structure for reducing partial electrical discharge of dry type transformer |
| CN110940801A (en) * | 2019-12-09 | 2020-03-31 | 国网天津市电力公司 | Method for acquiring activation energy of dry-type insulating equipment based on equal conversion rate method |
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- 2021-10-22 CN CN202111232401.6A patent/CN114113924B/en active Active
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| CN1464838A (en) * | 2001-07-30 | 2003-12-31 | 三井金属鉱业株式会社 | Capacitor layer forming both side copper clad laminated heet and production method therefor |
| CN101135789A (en) * | 2007-09-25 | 2008-03-05 | 上海海晶电子有限公司 | Method for resolving breakdown of LCD device electrostatic |
| JP2009238436A (en) * | 2008-03-26 | 2009-10-15 | Yamari Sangyo Kk | Terminal sealing structure of sheath type heater, sheath type heater equipped with it, and terminal sealing method of sheath type heater |
| CN101812217A (en) * | 2010-04-15 | 2010-08-25 | 河南许绝电工绝缘材料有限公司 | Partial discharge resistant epoxy casting resin |
| CN102623151A (en) * | 2011-01-30 | 2012-08-01 | 张家港市沙洲特种变压器制造有限公司 | Stable compressed structure for reducing partial electrical discharge of dry type transformer |
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Effective date of registration: 20240118 Address after: 230000 floor 1, building 2, phase I, e-commerce Park, Jinggang Road, Shushan Economic Development Zone, Hefei City, Anhui Province Patentee after: Dragon totem Technology (Hefei) Co.,Ltd. Address before: 611756 Southwest Jiaotong University, Chengdu, Sichuan Patentee before: SOUTHWEST JIAOTONG University |