CN113690869B - Transformer substation's line side arrester - Google Patents
Transformer substation's line side arrester Download PDFInfo
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- CN113690869B CN113690869B CN202111095329.7A CN202111095329A CN113690869B CN 113690869 B CN113690869 B CN 113690869B CN 202111095329 A CN202111095329 A CN 202111095329A CN 113690869 B CN113690869 B CN 113690869B
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H9/00—Emergency protective circuit arrangements for limiting excess current or voltage without disconnection
- H02H9/04—Emergency protective circuit arrangements for limiting excess current or voltage without disconnection responsive to excess voltage
- H02H9/042—Emergency protective circuit arrangements for limiting excess current or voltage without disconnection responsive to excess voltage comprising means to limit the absorbed power or indicate damaged over-voltage protection device
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Abstract
The invention discloses a transformer substation line side arrester, comprising: the first lightning arrester, the second lightning arrester and the third lightning arrester are sequentially installed on a transformer substation incoming line section from inside to outside; the rated voltage ratio of the first lightning arrester, the second lightning arrester and the third lightning arrester is 1: 1.05: 1.1. according to the transformer substation line side lightning arrester provided by the invention, rated voltage is differentially selected in a distributed mode of a plurality of lightning arresters, so that the graded absorption of the energy of lightning invasion waves in continuous lightning strokes is realized, the burden of each lightning arrester is reduced, the energy absorption capacity is higher, and the problem of thermal collapse of the line side lightning arrester caused by the lightning invasion waves along the line under the severe working condition of continuous lightning strokes due to insufficient energy absorption capacity can be solved.
Description
Technical Field
The invention relates to the technical field of electric power lightning protection, in particular to a transformer substation line side lightning arrester.
Background
After the power transmission line of the transformer substation is struck by lightning, on one hand, the generated lightning invasion wave can be transmitted to the transformer substations on two sides along the line. Thus, the line-side arrester becomes the first line of defense for substation lightning ingress protection, and its parameters are typically designed according to the lightning withstand level of the substation line-side equipment. On the other hand, the line side arrester absorbs the energy of the lightning aggression waves, and therefore the parameters of the arrester are chosen taking into account the absorption capacity of the lightning aggression waves, in addition to its protective properties.
The energy absorption capacity (current capacity) of existing line side arresters is often checked against a single lightning strike. However, most lightning processes are continuous lightning strokes consisting of a main discharge and several subsequent back strikes, which generally refers to a short period of continuous lightning loss or multiple lightning strokes with a time interval of no more than 100ms compared to a single lightning stroke. Because the time of the continuous lightning stroke process is extremely short, the heat dissipation effect of the existing line side lightning arrester is usually ignored. However, the resistance card continuously absorbs the energy of the lightning invading wave to cause higher temperature rise, the accumulated absorbed energy is easy to reach a higher level, even approaches or exceeds the through-current capacity of the resistance card, the irreversible accelerated degradation of the resistance card is caused, and further the thermal breakdown accident is caused under the subsequent power frequency voltage action.
Disclosure of Invention
The invention aims to provide a transformer substation line side lightning arrester, which aims to solve the problem that the existing line side lightning arrester is easy to generate thermal collapse phenomenon due to insufficient energy absorption capacity under the severe working condition of continuous lightning strike.
In order to achieve the above object, the present invention provides a substation line side arrester, comprising:
the first lightning arrester, the second lightning arrester and the third lightning arrester are sequentially installed on a transformer substation incoming line section from inside to outside; the rated voltage ratio of the first lightning arrester, the second lightning arrester and the third lightning arrester is 1: 1.05: 1.1.
preferably, the first lightning arrester is a 110 kV-500 kV composite jacket gapless metal oxide lightning arrester.
Preferably, when said first arrester is an arrester of the order of 110kV or 220kV, the corresponding nominal discharge current is 10 kA.
Preferably, when said first arrester is an arrester of the 500kV class, the corresponding nominal discharge current is 20 kA.
Preferably, the second lightning arrester is a 110 kV-500 kV composite jacket gapless metal oxide lightning arrester.
Preferably, when said second arrester is of the order of 110kV or 220kV, the corresponding nominal discharge current is 10 kA.
Preferably, when said second arrester is an arrester of the 500kV class, the corresponding nominal discharge current is 20 kA.
Preferably, the third lightning arrester is a 110 kV-500 kV composite jacket gapless metal oxide lightning arrester.
Preferably, when said third arrester is an arrester of the order of 110kV or 220kV, the corresponding nominal discharge current is 10 kA.
Preferably, when said third arrester is an arrester of the 500kV class, the corresponding nominal discharge current is 20 kA.
Compared with the prior art, the invention has the beneficial effects that:
(1) the energy of lightning intruding waves is absorbed in stages by changing a single lightning arrester into a group of lightning arrester arrangements in a distributed arrangement.
(2) By adjusting the rated voltage of the lightning arresters in a differentiated manner (the rated voltage is higher when the lightning arresters are far away from a transformer substation), the energy of lightning invasion waves can be uniformly transmitted to each lightning arrester, and grading and balanced energy absorption of each lightning arrester is realized.
(3) The protection level of the line side lightning arrester is determined by the lightning arrester closest to the transformer substation, the rated voltage of the line side lightning arrester is selected according to the insulation matching requirement of the transformer substation, and the residual voltage under the nominal discharge current is matched with the lightning impulse tolerance level of the line side switch fracture, so that the lightning intrusion wave protection function of the transformer substation can be met.
Compared with the prior art, the transformer substation line side lightning arrester disclosed by the invention considers the adverse factor of the increase of the absorption energy of the line side lightning arrester under the severe working condition of continuous lightning strike lines, carries out differential selection on rated voltage by a mode of distributing a plurality of lightning arresters, realizes the graded absorption of the energy of lightning invasion waves in continuous lightning strikes, reduces the burden of each lightning arrester, has the advantage of higher energy absorption capacity, can solve the problem of thermal breakdown of the line side lightning arrester caused by the lightning invasion waves along the lines under the severe working condition of continuous lightning strikes due to insufficient energy absorption capacity, can maintain the excellent transformer substation lightning invasion wave protection performance of the line side lightning arrester in the prior art, effectively considers the protection performance of the lightning arresters and the safety of the line side lightning invasion waves under the severe working condition of continuous lightning strikes and realizes the effective protection of the transformer substation against the lightning invasion waves of the continuous lightning strikes, the method is suitable for a thunderbolt area and a strong lightning activity area, in particular to a continuous lightning stroke operation environment of a power transmission line.
Drawings
In order to more clearly illustrate the technical solution of the present invention, the drawings needed to be used in the embodiments will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art that other drawings can be obtained according to the drawings without creative efforts.
Fig. 1 is a schematic structural diagram of a substation line-side arrester according to an embodiment of the present invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
It should be understood that the step numbers used herein are for convenience of description only and are not intended as limitations on the order in which the steps are performed.
It is to be understood that the terminology used in the description of the invention herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. As used in the specification of the present invention and the appended claims, the singular forms "a," "an," and "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise.
The terms "comprises" and "comprising" indicate the presence of the described features, integers, steps, operations, elements, and/or components, but do not preclude the presence or addition of one or more other features, integers, steps, operations, elements, components, and/or groups thereof.
The term "and/or" refers to and includes any and all possible combinations of one or more of the associated listed items.
Referring to fig. 1, fig. 1 is a schematic structural diagram of a substation line-side arrester according to an embodiment of the present invention. As shown in fig. 1, the substation line side arrester includes: the first lightning arrester, the second lightning arrester and the third lightning arrester are sequentially installed on a transformer substation incoming line section from inside to outside; wherein, the rated voltage ratio of first arrester, second arrester and third arrester is 1: 1.05: 1.1.
it should be noted that the overvoltage protection device on the line side of the transformer substation in the prior art mainly relies on the gapless metal oxide arrester on the line side installed at the same position as the first arrester in fig. 1, and the residual voltage under the nominal discharge current of the arrester is required to be matched with the lightning impulse tolerance level of the break of the switch on the line side. However, the energy absorption capacity (current capacity) of the line side arrester is checked according to single lightning impulse, because the time of the continuous lightning stroke process is extremely short, the heat dissipation effect of the line side arrester is ignored, the lightning arrester resistance sheet continuously absorbs the energy of lightning invading waves to cause higher temperature rise, the accumulated absorption energy can reach a higher level, even approaches or exceeds the current capacity of the lightning arrester, the irreversible accelerated degradation of the lightning arrester is caused, and the thermal breakdown accident can be caused under the subsequent power frequency voltage action.
In order to avoid the above problem, in this embodiment, the first lightning arrester, the second lightning arrester, and the third lightning arrester are sequentially installed on the substation incoming line section from inside to outside. Based on the idea of graded absorption of lightning invasion wave energy by the distributed lightning arresters, the group of lightning arresters consists of a plurality of lightning arresters arranged on a plurality of base towers. It can be understood that the more the number of the lightning arresters is, the lighter the burden of each lightning arrester for absorbing the energy of the lightning intruding wave is, but meanwhile, the cost problem also needs to be considered, so that in the embodiment, the final determination is that 3 lightning arresters are adopted by combining with simulation calculation and analysis, and the better configuration can take the technology and the cost into consideration.
In this embodiment, the lightning arrester is installed on the first three-base tower of the substation outgoing line, and is installed in three phases. As shown in fig. 1, the first lightning arrester is installed on a terminal tower, and the second lightning arrester and the third lightning arrester are installed on a second base and a third base tower outward from the transformer substation, respectively.
In this embodiment, the rated voltage of the first lightning arrester closest to the substation is selected according to the insulation matching requirement of the substation, and the rated voltages of the other two lightning arresters are gradually increased from inside to outside of the substation according to a proportion of 5%.
Specifically, the rated voltage of the first lightning arrester can refer to the existing line side lightning arrester, and for areas with severe continuous lightning stroke operation conditions, the rated voltage is recommended to be selected according to the special requirements of insulation matching of a transformer substation, and a slightly lower rated voltage value can be selected.
The rated voltages of the second arrester and the third arrester are increased step by step according to the proportion alpha, for example, alpha can be 5%, that is, the rated voltages of the second arrester and the third arrester are respectively 1.05 times and 1.1 times higher than that of the first arrester.
Taking the existing line side arrester as an example, the parameters of the first arrester are as follows:
(1)110kV grade: rated voltage 108kV, rated discharge current 10kA, residual voltage under the rated discharge current lower than 281kV, and 2ms square wave current capacity (18 times) of 1000A.
(2)220kV grade: rated voltage 204kV, nominal discharge current 10kA, residual voltage under the nominal discharge current lower than 532kV, and 2ms square wave through-current capacity (18 times) 1000A.
(3)500kV grade: rated voltage 444kV, rated discharge current 20kA, residual voltage under the rated discharge current lower than 1106kV, and 2ms square wave current capacity (18 times) of 1800A.
Correspondingly, the residual voltage of the second lightning arrester and the third lightning arrester of 110 kV-500 kV under the rated voltage and the nominal discharge current is respectively 1.05 times and 1.1 times of that of the first lightning arrester, and the nominal discharge current and the 2ms square wave through-current capacity (18 times) are the same as those of the first lightning arrester.
Taking a 500kV line side lightning arrester which is triggered by excessive continuous lightning strikes and has thermal breakdown fault under the subsequent system voltage as an example, establishing a line model according to the attached drawing 1, wherein the span of a tower is 300m, the distance between a terminal tower and a circuit breaker at the line side of a transformer substation is 100m, and the distance between the lightning strike point and an MOA3 is set to be 2 km; considering that the peak value of 1.2/50 mus lightning current which does not flashover around the line insulator is 10kA, the wave speed is the light speed, and the line wave impedance is taken as Z equal to 300 omega; the values of the parameters of the first arrester to the third arrester are the same as the above.
For the sake of accuracy, during the intrusion of lightning waves, the circuit breaker is in an open state, the lightning intruding waves are totally reflected at the cut of the circuit breaker, the reflected waves continue to act on the lightning arrester, and the energy absorption burden of the lightning arrester is heavy.
Based on PSCAD simulation software, calculating to obtain the energy absorbed by each arrester, and displaying the result: (1) the problem of overlarge energy absorption of the existing primary lightning arrester can be well solved by installing the tertiary lightning arrester; (2) when the rated voltage gradient of the three-column arrester is set to be 5%, the energy absorbed by the three-column arrester is distributed uniformly.
In an optional specific embodiment, the first arrester is a 110 kV-500 kV composite jacket gapless metal oxide arrester. When the first lightning arrester is a 110kV or 220kV grade lightning arrester, the corresponding nominal discharge current is 10 kA; and when the first lightning arrester is a lightning arrester with 500kV grade, the corresponding nominal discharge current is 20 kA.
In an optional specific embodiment, the second arrester is a 110 kV-500 kV composite jacket gapless metal oxide arrester. When the second lightning arrester is a 110kV or 220kV grade lightning arrester, the corresponding nominal discharge current is 10 kA; and when the second lightning arrester is a lightning arrester with 500kV grade, the corresponding nominal discharge current is 20 kA.
In an optional specific embodiment, the third arrester is a 110 kV-500 kV composite jacket gapless metal oxide arrester. When the third lightning arrester is a 110kV or 220kV grade lightning arrester, the corresponding nominal discharge current is 10 kA; and when the third lightning arrester is a lightning arrester with the 500kV grade, the corresponding nominal discharge current is 20 kA.
The transformer substation line side lightning arrester disclosed by the embodiment of the invention can realize the following functions:
(1) the energy of lightning intruding waves is absorbed in stages by changing a single lightning arrester into a group of lightning arrester arrangements in a distributed arrangement.
(2) By adjusting the rated voltage of the lightning arresters in a differentiated manner (the rated voltage of the person far away from the transformer substation is higher), the energy of lightning invasion waves can be uniformly transmitted to each lightning arrester, and grading and balanced energy absorption of the lightning arresters are realized.
(3) The protection level of the line side lightning arrester is determined by the first lightning arrester closest to the transformer substation, the rated voltage of the line side lightning arrester is selected according to the insulation matching requirement of the transformer substation, and the residual voltage under the nominal discharge current is matched with the lightning impulse tolerance level of the line side switch fracture, so that the lightning intrusion protection function of the transformer substation can be met.
Compared with the prior art, the transformer substation line side lightning arrester disclosed by the embodiment of the invention considers the adverse factor that the line side lightning arrester absorbs energy increase under the severe working condition of continuous lightning strike line, carries out differential selection on rated voltage in a distributed mode of a plurality of lightning arresters, realizes graded absorption of the energy of lightning invasion waves in continuous lightning strike, reduces the burden of each lightning arrester, has the advantage of higher energy absorption capacity, can solve the problem of thermal breakdown of the line side lightning arrester caused by insufficient energy absorption capacity due to the lightning invasion waves along the line under the severe working condition of continuous lightning strike, can maintain the excellent protection performance of the transformer substation invasion waves of the line side lightning arrester in the prior art, effectively considers the protection performance of the lightning arresters and the safety of the transformer substation under the severe working condition of continuous lightning strike, and realizes the effective protection of the transformer substation against the lightning invasion waves of the continuous lightning strike, the method is suitable for a thunderbolt area and a strong lightning activity area, in particular to a continuous lightning stroke operation environment of a power transmission line.
It should be noted that the above-described device embodiments are merely illustrative, where the units described as separate parts may or may not be physically separate, and the parts displayed as units may or may not be physical units, may be located in one place, or may be distributed on multiple network units. Some or all of the modules may be selected according to actual needs to achieve the purpose of the solution of the present embodiment. In addition, in the drawings of the embodiment of the apparatus provided by the present invention, the connection relationship between the modules indicates that there is a communication connection between them, and may be specifically implemented as one or more communication buses or signal lines. One of ordinary skill in the art can understand and implement it without inventive effort.
While the foregoing is directed to the preferred embodiment of the present invention, it will be understood by those skilled in the art that various changes and modifications may be made without departing from the spirit and scope of the invention.
Claims (3)
1. A transformer substation line side arrester characterized by comprising:
the first lightning arrester, the second lightning arrester and the third lightning arrester are sequentially installed on a transformer substation incoming line section from inside to outside; the first lightning arrester, the second lightning arrester and the third lightning arrester are 110 kV-500 kV composite jacket gapless metal oxide lightning arresters, and the ratio of rated voltage is 1: 1.05: 1.1, during the invasion of lightning waves, a circuit breaker is in a disconnection state, the lightning invasion waves are totally reflected at the fracture of the circuit breaker, reflected waves continuously act on a first lightning arrester, a second lightning arrester and a third lightning arrester, the first lightning arrester, the second lightning arrester and the third lightning arrester enable the energy of the lightning invasion waves to be uniform to each lightning arrester, grading and balanced energy absorption of the lightning arresters are achieved, the protection performance of the lightning arresters and the safety of the lightning arresters under the severe operation working condition of continuous lightning strikes are effectively considered, and the lightning invasion waves of the continuous lightning strikes can be effectively protected.
2. The substation line side arrester according to claim 1, characterized in that when the first, second and third arresters are all arresters of the 110kV or 220kV class, the corresponding nominal discharge current is 10 kA.
3. The substation line side arrester according to claim 1, characterized in that when the first, second and third arresters are all 500kV class arresters, the corresponding nominal discharge current is 20 kA.
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN107979080A (en) * | 2017-10-26 | 2018-05-01 | 中国电力科学研究院有限公司 | The definite method and apparatus of arrester rated voltage along half-wave power transmission circuit |
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| JPS54129454A (en) * | 1978-03-31 | 1979-10-06 | Toshiba Corp | Transmission line |
| JP2011166915A (en) * | 2010-02-08 | 2011-08-25 | Toshiba Corp | Power station/substation equipment and lightning surge absorber |
| CN107834528B (en) * | 2017-10-31 | 2022-04-29 | 中国电力科学研究院有限公司 | Optimal control method and device for power fluctuation overvoltage of half-wavelength power transmission line |
| CN113178853B (en) * | 2021-04-29 | 2023-03-14 | 广东电网有限责任公司电力科学研究院 | Overvoltage protection system for lightning invasion waves on transformer substation line side |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN107979080A (en) * | 2017-10-26 | 2018-05-01 | 中国电力科学研究院有限公司 | The definite method and apparatus of arrester rated voltage along half-wave power transmission circuit |
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