CN107516870A - A kind of cable run automatic reclosing method based on short circuit current heat localization process - Google Patents
A kind of cable run automatic reclosing method based on short circuit current heat localization process Download PDFInfo
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- CN107516870A CN107516870A CN201710948475.7A CN201710948475A CN107516870A CN 107516870 A CN107516870 A CN 107516870A CN 201710948475 A CN201710948475 A CN 201710948475A CN 107516870 A CN107516870 A CN 107516870A
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- 230000004807 localization Effects 0.000 title abstract 4
- 239000002184 metal Substances 0.000 claims abstract description 7
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- 238000012544 monitoring process Methods 0.000 claims description 10
- 239000010410 layer Substances 0.000 claims description 9
- 239000002689 soil Substances 0.000 claims description 8
- 238000009413 insulation Methods 0.000 claims description 7
- 239000004020 conductor Substances 0.000 claims description 6
- 230000007613 environmental effect Effects 0.000 claims description 6
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Classifications
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H3/00—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection
- H02H3/02—Details
- H02H3/06—Details with automatic reconnection
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H3/00—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection
- H02H3/08—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection responsive to excess current
- H02H3/085—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection responsive to excess current making use of a thermal sensor, e.g. thermistor, heated by the excess current
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- Laying Of Electric Cables Or Lines Outside (AREA)
Abstract
The present invention provides a kind of cable run automatic reclosing method based on short circuit current heat localization process, including：Obtain cable laying type, the operation time limit and ambient parameter；The geometrical structure parameter of cable is measured, reads the resistance parameter of the corresponding thermal capacitance of cable above layers, thermal resistance and metal part, wherein ambient parameter, thermal capacitance, thermal resistance and resistance parameter are as calculating parameter；According to the calculating parameter and the geometrical structure parameter of cable, establish the mathematical modeling of cable dynamic heat localization process under short circuit current effect, and automatic reclosing strategy is formulated according to the temperature change during the heat localization of gained cable and laying type, the operation time limit, include the delay time and number of automatic reclosing.Pin of the present invention has filled up the blank of existing cable automatic reclosing strategy application, can formulate automatic reclosing strategy according to the running status of different cables, greatly reduce the workload and power off time of artificial reclosing, improve the reliability of power supply conscientiously.
Description
Technical Field
The invention relates to the technical field of high voltage and insulation, in particular to an automatic reclosing method for a cable line.
Background
With the continuous acceleration of urbanization construction and the improvement of the requirement on power supply reliability, the change of overhead lines into cables has become a necessary trend. For a long time, an automatic reclosing technology is widely used in an overhead line, power supply reliability is effectively improved, but at present, unified knowledge is not formed whether an automatic reclosing is adopted for a power distribution network cable-containing line or not. The existing regulations of the national grid company stipulate that the cable line does not adopt automatic reclosing, mainly consider that the fault of the cable line in the operation process is generally a permanent fault, and the reclosing operation brings serious short circuit impact and operation overvoltage, which brings damage to the equipment such as the cable and the transformer, and further enlarges the accident. However, from the analysis result of the distribution line fault of the operation department, the instantaneous fault of the full cable line still occupies a certain proportion, and the power supply reliability can be effectively improved if the pure cable line is put into automatic reclosing.
However, the blind reclosing of cables in different states may cause serious consequences of fire and explosion of the cables, which not only cannot fully play the role of improving the power supply reliability of the automatic reclosing, but also has hidden troubles of expanding faults and harming personal and equipment safety. Therefore, it is urgently needed to determine whether to reclose according to the actual situation of each cable line and through a scientific method.
Disclosure of Invention
The invention aims to provide a cable line automatic reclosing method based on a short-circuit current heat accumulation process, so as to solve the technical problem. The input quantity of the invention only needs the current of the cable at the time of short circuit fault acquisition by the existing current monitoring system, so the requirement of the applied hardware is lower, and the invention is easy to popularize. The cable state evaluation method and the cable state evaluation device can evaluate the cable state based on the existing current monitoring system and the ledger information so as to determine the reclosing times and the delay time. The invention can effectively improve the power supply reliability of the cable line, and has extremely important theoretical and practical values particularly under the large background that the neutral point grounding mode of the distribution network system is changed from high-resistance grounding to low-resistance grounding.
In order to achieve the purpose, the invention adopts the following technical scheme:
a cable line automatic reclosing method based on a short-circuit current heat accumulation process comprises the following steps:
the method comprises the following steps of monitoring and obtaining environmental parameters corresponding to the cable laying type of a corresponding cable line, wherein the monitoring and obtaining steps comprise: convection heat transferCoefficient a, soil bottom temperature TsoilSoil thermal resistivity rho and atmospheric real-time temperature Tamb；
Reading the geometric parameters of the cable structure, and solving the corresponding heat capacity and heat resistance of each layer of the cable and the resistance parameters of the metal part according to the geometric parameters;
step three, establishing a finite element calculation model of the short-circuit current heat accumulation process, and calculating the change relation of the temperature T (x, y, T) and the time T of the cable under the action of the short-circuit current according to a numerical iteration mode;
step four, after the temperature T (x, y, T) of each area of the cable under the action of the short-circuit current is obtained, the highest temperature T of the cable area is readmaxAnd configuring an automatic reclosing strategy of the cable line.
Further, the geometric parameters of the cable structure include: diameter D of conductor1Conductor shield thickness1Insulation thickness t1Insulation shielding thickness ti2Thickness t of metal shieldsThickness t of inner protective layer2Armor thickness and outer jacket thickness t3。
Further, the third step is specifically:
calculating to obtain a heat conductivity coefficient D according to the heat capacity and the heat resistance of each layer of the cable calculated in the step two, and solving the thermal diffusivity K by utilizing the heat capacity storage capacity; at the same time, according to the short-circuit current IFCalculating the heating rate of the internal heat source of each wire core according to the resistance parameter of the wire core
qv＝IF 2R/S0(1)
Wherein S is0The area of the area where the cable core is located; r is the direct current resistance of the cable;
establishing a cable solving area S according to the geometric structure parameters of each layer structure, and obtaining a heat transfer formula by coordinates x and y of a point on the cable solving area S where the cable solving area S is located, wherein the formula is shown as (2):
wherein T represents the temperature of the core of the cable, D is the coefficient of thermal conductivity of each region, K is the thermal diffusivity of each region, qvThe heat generation rate of an internal heat source;
taking the environmental parameters obtained in the first step as boundary conditions of a solving area S of the formula (2), and performing variation on the boundary conditions on the basis of the boundary conditions to obtain a functional I shown as the formula (3):
wherein L is the boundary of the region S;
the functional I is divided into a finite number of cells in the region S and discretized to yield equation (4):
wherein,in the form of a matrix of stiffness,and (3) a heat source density matrix, wherein NE is the number of units, and finally, the extreme value of the functional I is solved to obtain the variation relation between the temperature T (x, y, T) and the time T of each area of the cable under the action of the short-circuit current.
Further, according to the obtained score of the change relation between the temperature T (x, y, T) and the time T under the action of the short-circuit current, the score of the laying mode and the score of the operation period, the total score is obtained by combining the corresponding weight coefficients of the three, and the reclosing delay time and the reclosing time are determined according to the total score.
Furthermore, the ratio of the weight coefficients corresponding to the three is 40%: 40%: 20 percent.
Further, under the action of the short-circuit current, the variation relation between the temperature T (x, y, T) and the time T is obtained, the expected delay time T is utilized to solve the temperature T (x, y, T) at the corresponding moment, and the maximum value T of the temperature is obtainedmaxQuerying the corresponding score:
| Tmaxtemperature range of | Scoring |
| (-∞，90℃) | 100 |
| [90℃，135℃) | 80 |
| [135℃，250℃) | 60 |
| [250℃，+∞) | 0 |
Further, inquiring corresponding scores according to different laying mode types:
further, according to different operation years, inquiring corresponding scores:
| operating life | Scoring |
| Less than 5 years | 100 |
| More than 5 years and less than 15 years | 80 |
| More than 15 years and less than 25 years | 60 |
| More than 25 years | 0 |
Further, the delay time is automatically set according to a protection configuration strategy, and the setting of the reclosing times comprises the following steps:
| total score | Number of reclosure cycles |
| [90，100] | 2 |
| [80，90) | 1 |
| [0，80) | Automatic reclosing switch for strictly forbidden configuration |
Compared with the prior art, the invention has the following beneficial effects:
according to the invention, the monitoring system is used for collecting the current when the short-circuit fault occurs to the cable line, so that not only are the cost and potential safety hazards caused by additional monitoring equipment avoided, but also the problem that the collection of weak current by the traditional online monitoring means is interfered by the outside can be effectively avoided. Under the big background that the neutral point grounding mode of a distribution network system is changed from high-resistance grounding to low-resistance grounding, the cable tripping probability is inevitably greatly improved.
Drawings
FIG. 1 is a schematic flow diagram of a configuration reclosing method based on a short circuit current heat accumulation process according to the present invention;
Detailed Description
The technical solution of the present invention will be clearly and completely described below with reference to the accompanying drawings.
Referring to fig. 1, the invention provides a cable line automatic reclosing method based on a short-circuit current heat accumulation process, which comprises the following steps:
the method comprises the following steps of firstly, monitoring and obtaining environmental parameters corresponding to corresponding cable laying types, wherein the method comprises the following steps: convective heat transfer coefficient a and soil bottom temperature TsoilThermal resistance of soilRate rho, atmospheric real-time temperature Tamb；
Reading the geometric parameters of the cable structure, and solving the corresponding heat capacity and heat resistance of each layer and the resistance parameters of the metal part according to the geometric parameters;
step three, establishing a finite element calculation model of the short-circuit current heat accumulation process according to the parameters, and calculating the change relation between the temperature T (x, y, T) and the time T of the cable under the action of the short-circuit current according to a numerical iteration mode;
step four, reading the highest temperature T of the cable area after obtaining the temperature T (x, y, T) of each area of the cable under the action of the short-circuit currentmaxAnd configuring an automatic reclosing strategy of the cable line.
In the second step, the geometric parameters of the cable structure comprise the diameter D of the conductor1Conductor shield thickness1Insulation thickness t1Insulation shielding thickness ti2Thickness t of metal shieldsThickness t of inner protective layer2Armor thickness, outer jacket thickness t3。
The third step is specifically as follows:
and D, calculating to obtain a heat conductivity coefficient D according to the heat capacity and the heat resistance of each layer of the cable calculated in the step two, and solving the thermal diffusivity K by utilizing the heat capacity storage capacity. At the same time, according to the short-circuit current IFCalculating the heating rate of the internal heat source of each wire core according to the resistance parameter of the wire core
qv＝IF 2R/S0(1)
Wherein S is0The area of the area where the cable core is located; and R is the direct current resistance of the cable.
Establishing a cable solving area S according to the geometric structure parameters of each layer structure, and obtaining a heat transfer formula by coordinates x and y of a point on the cable solving area S where the cable solving area S is located, wherein the formula is shown as (2):
wherein T represents the temperature of the core of the cable, D is the coefficient of thermal conductivity of each region, K is the thermal diffusivity of each region, qvThe heat generation rate of an internal heat source;
taking the environmental parameters obtained in the first step as boundary conditions of a solving area S of the formula (2), and performing variation on the boundary conditions on the basis of the boundary conditions to obtain a functional I shown as the formula (3):
wherein L is the boundary of the region S;
the functional I is divided into a finite number of cells in the region S and discretized to yield equation (4):
wherein,in the form of a matrix of stiffness,and (3) obtaining a heat source density matrix, wherein NE is the number of units, and finally solving the extreme value of the functional I to obtain the variation relation between the temperature T (x, y, T) and the time T of each area of the cable under the action of the short-circuit current.
Then, calculating according to the obtained change relation of the temperature T (x, y, T) and the time T under the action of the short-circuit current and the weight coefficients of the laying mode and the operation period, and determining the time delay and the number of reclosing times, wherein the weight ratio of the three is 40%: 40%: 20 percent.
Specifically, the variation relation of temperature T (x, y, T) and time T under the action of short-circuit current is solved by using the expected delay time TThe temperature T (x, y, T) at the corresponding moment and the maximum value T of the temperature obtainedmaxThe corresponding score is queried. Wherein, the scoring comprises:
according to the laying mode, inquiring corresponding scores according to different laying mode types comprises the following steps:
| laying type | Scoring |
| Direct buried/overhead | 100 |
| Calandria | 80 |
| Groove | 60 |
| Tunnel | 0 |
As mentioned above, the query of the corresponding score according to different operation years includes:
| operating life | Scoring |
| Less than 5 years | 100 |
| More than 5 years and less than 15 years | 80 |
| More than 15 years and less than 25 years | 60 |
| More than 25 years | 0 |
The reclosing delay time and the reclosing frequency are as follows: the delay time is automatically established according to a protection configuration strategy, and the establishment of the reclosing times comprises the following steps:
| total score | Number of reclosure cycles |
| [90，100] | 2 |
| [80，90) | 1 |
| [0，80) | Automatic reclosing switch for strictly forbidden configuration |
Multiplying the scores of the three by the corresponding weights, and then adding the scores to obtain a final score, wherein the score is greater than or equal to 90, and the reclosure times are 2; less than 90 and greater than or equal to 80, and the reclosing times is 1; and if the current value is less than 80, the automatic reclosing is strictly forbidden to be configured.
The above description is only an embodiment of the present invention, but the scope of the present invention is not limited thereto, and any changes or substitutions that can be easily conceived by those skilled in the art within the technical scope of the present invention are included in the scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the claims.
Claims (9)
1. A cable line automatic reclosing method based on a short-circuit current heat accumulation process is characterized by comprising the following steps:
the method comprises the following steps of monitoring and obtaining environmental parameters corresponding to the cable laying type of a corresponding cable line, wherein the monitoring and obtaining steps comprise: convective heat transfer coefficient a and soil bottom temperature TsoilSoil thermal resistivity rho and atmospheric real-time temperature Tamb；
Reading the geometric parameters of the cable structure, and solving the corresponding heat capacity and heat resistance of each layer of the cable and the resistance parameters of the metal part according to the geometric parameters;
step three, establishing a finite element calculation model of the short-circuit current heat accumulation process, and calculating the change relation of the temperature T (x, y, T) and the time T of the cable under the action of the short-circuit current according to a numerical iteration mode;
step four, after the temperature T (x, y, T) of each area of the cable under the action of the short-circuit current is obtained, the highest temperature T of the cable area is readmaxAnd configuring an automatic reclosing strategy of the cable line.
2. The cable line automatic reclosing method based on the short-circuit current heat accumulation process as claimed in claim 1, wherein: the geometrical parameters of the cable structure include: diameter D of conductor1Conductor shield thickness1Insulation thickness t1Insulation shielding thickness ti2Thickness t of metal shieldsThickness t of inner protective layer2Armor thickness and outer jacket thickness t3。
3. The cable line automatic reclosing method based on the short-circuit current heat accumulation process as claimed in claim 1, wherein: the third step is specifically as follows:
calculating to obtain a heat conductivity coefficient D according to the heat capacity and the heat resistance of each layer of the cable calculated in the step two, and solving the thermal diffusivity K by utilizing the heat capacity storage capacity; at the same time, according to the short-circuit current IFCalculating the heating rate of the internal heat source of each wire core according to the resistance parameter of the wire core
qv＝IF 2R/S0(1)
Wherein S is0The area of the area where the cable core is located; r is the direct current resistance of the cable;
establishing a cable solving area S according to the geometric structure parameters of each layer structure, and obtaining a heat transfer formula by coordinates x and y of a point on the cable solving area S where the cable solving area S is located, wherein the formula is shown as (2):
<mrow> <mfrac> <mrow> <msup> <mo>&part;</mo> <mn>2</mn> </msup> <mi>T</mi> </mrow> <mrow> <mo>&part;</mo> <msup> <mi>x</mi> <mn>2</mn> </msup> </mrow> </mfrac> <mo>+</mo> <mfrac> <mrow> <msup> <mo>&part;</mo> <mn>2</mn> </msup> <mi>T</mi> </mrow> <mrow> <mo>&part;</mo> <msup> <mi>y</mi> <mn>2</mn> </msup> </mrow> </mfrac> <mo>+</mo> <mfrac> <msub> <mi>q</mi> <mi>v</mi> </msub> <mi>D</mi> </mfrac> <mo>=</mo> <mi>K</mi> <mfrac> <mrow> <mo>&part;</mo> <mi>T</mi> </mrow> <mrow> <mo>&part;</mo> <mi>t</mi> </mrow> </mfrac> <mo>-</mo> <mo>-</mo> <mo>-</mo> <mrow> <mo>(</mo> <mn>2</mn> <mo>)</mo> </mrow> </mrow>
wherein T represents the temperature of the core of the cable, D is the coefficient of thermal conductivity of each region, K is the thermal diffusivity of each region, qvThe heat generation rate of an internal heat source;
taking the environmental parameters obtained in the first step as boundary conditions of a solving area S of the formula (2), and performing variation on the boundary conditions on the basis of the boundary conditions to obtain a functional I shown as the formula (3):
wherein L is the boundary of the region S;
the functional I is divided into a finite number of cells in the region S and discretized to yield equation (4):
<mrow> <mi>I</mi> <mrow> <mo>(</mo> <mi>T</mi> <mo>)</mo> </mrow> <mo>=</mo> <munderover> <mo>&Sigma;</mo> <mrow> <mi>e</mi> <mo>=</mo> <mn>1</mn> </mrow> <mrow> <mi>N</mi> <mi>E</mi> </mrow> </munderover> <msub> <mi>I</mi> <mi>e</mi> </msub> <mo>=</mo> <msup> <mover> <mi>T</mi> <mo>&OverBar;</mo> </mover> <mi>T</mi> </msup> <mover> <mi>K</mi> <mo>&OverBar;</mo> </mover> <mover> <mi>T</mi> <mo>&OverBar;</mo> </mover> <mo>-</mo> <mn>2</mn> <msup> <mover> <mi>T</mi> <mo>&OverBar;</mo> </mover> <mi>T</mi> </msup> <mover> <mi>P</mi> <mo>&OverBar;</mo> </mover> <mo>-</mo> <mo>-</mo> <mo>-</mo> <mrow> <mo>(</mo> <mn>4</mn> <mo>)</mo> </mrow> </mrow>
wherein,in the form of a matrix of stiffness,and (3) a heat source density matrix, wherein NE is the number of units, and finally, the extreme value of the functional I is solved to obtain the variation relation between the temperature T (x, y, T) and the time T of each area of the cable under the action of the short-circuit current.
4. The cable line automatic reclosing method based on the short-circuit current heat accumulation process as claimed in claim 3, characterized in that: and calculating according to the obtained grade of the change relation between the temperature T (x, y, T) and the time T under the action of the short-circuit current, the grade of the laying mode and the grade of the operating life by combining the corresponding weight coefficients of the three to obtain a total grade, and determining the reclosing delay time and the reclosing frequency according to the total grade.
5. The cable line automatic reclosing method based on the short-circuit current heat accumulation process as claimed in claim 4, wherein: the ratio of the weight coefficients corresponding to the three is 40%: 40%: 20 percent.
6. The cable line automatic reclosing method based on the short-circuit current heat accumulation process as claimed in claim 4, wherein: under the action of short-circuit current, the variation relation between temperature T (x, y, T) and time T is obtained, the expected delay time T is used for solving the temperature T (x, y, T) at the corresponding moment, and the maximum value T of the obtained temperature is obtainedmaxQuerying the corresponding score:
7. The cable line automatic reclosing method based on the short-circuit current heat accumulation process as claimed in claim 4, wherein: inquiring corresponding scores according to different laying mode types:
8. The cable line automatic reclosing method based on the short-circuit current heat accumulation process as claimed in claim 4, wherein: inquiring corresponding scores according to different operation years:
9. The cable line automatic reclosing method based on the short-circuit current heat accumulation process as claimed in claim 4, wherein: the delay time is automatically established according to a protection configuration strategy, and the establishment of the reclosing times comprises the following steps:
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Citations (3)
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|---|---|---|---|---|
| EP1780858A1 (en) * | 2005-10-31 | 2007-05-02 | ABB Technology AG | Arrangement and method for protecting an electric power system |
| CN101789587A (en) * | 2010-01-08 | 2010-07-28 | 黄震 | Automatic reclosing method of A type overhead line- cable hybrid line |
| CN102749554A (en) * | 2012-06-19 | 2012-10-24 | 张忠华 | Electric power circuit fault detecting system |
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2017
- 2017-10-12 CN CN201710948475.7A patent/CN107516870B/en active Active
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP1780858A1 (en) * | 2005-10-31 | 2007-05-02 | ABB Technology AG | Arrangement and method for protecting an electric power system |
| CN101789587A (en) * | 2010-01-08 | 2010-07-28 | 黄震 | Automatic reclosing method of A type overhead line- cable hybrid line |
| CN102749554A (en) * | 2012-06-19 | 2012-10-24 | 张忠华 | Electric power circuit fault detecting system |
Non-Patent Citations (1)
| Title |
|---|
| 杨军: ""高温超导电缆保护理论与技术研究"", 《中国优秀博士学位论文全文数据库》 * |
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