CN112798853A - Assessment method for lightning invasion wave level of substation electrical equipment for resisting continuous lightning stroke - Google Patents
Assessment method for lightning invasion wave level of substation electrical equipment for resisting continuous lightning stroke Download PDFInfo
- Publication number
- CN112798853A CN112798853A CN202011586683.5A CN202011586683A CN112798853A CN 112798853 A CN112798853 A CN 112798853A CN 202011586683 A CN202011586683 A CN 202011586683A CN 112798853 A CN112798853 A CN 112798853A
- Authority
- CN
- China
- Prior art keywords
- lightning
- transformer substation
- electrical equipment
- stroke
- strike
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
Classifications
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R19/00—Arrangements for measuring currents or voltages or for indicating presence or sign thereof
- G01R19/165—Indicating that current or voltage is either above or below a predetermined value or within or outside a predetermined range of values
- G01R19/17—Indicating that current or voltage is either above or below a predetermined value or within or outside a predetermined range of values giving an indication of the number of times this occurs, i.e. multi-channel analysers
Landscapes
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Emergency Protection Circuit Devices (AREA)
Abstract
The invention provides a method for evaluating the level of lightning invasion waves of electrical equipment of a transformer substation for resisting continuous lightning strokes. The lightning invasion wave level of the electrical equipment of the transformer substation for resisting continuous lightning strokes is evaluated based on the overvoltage value in each lightning stroke and the actual lightning tolerance voltage value of the equipment in each lightning stroke. According to the assessment method for the level of the lightning invasion wave of the electrical equipment of the transformer substation for resisting continuous lightning strokes, the continuous lightning strokes are divided into the first and subsequent attack times, the working condition of each lightning stroke condition is independently analyzed, meanwhile, the cumulative effect caused by the last lightning stroke is considered, and the calculation result is more accurate.
Description
Technical Field
The invention relates to the field of electric power, in particular to a method for evaluating the level of lightning invasion waves of electrical equipment of a transformer substation for resisting continuous lightning strokes.
Background
The transformer substation is an important component of a power system, the transformer substation equipment is expensive, and for most electrical equipment, the insulation of the transformer substation equipment has no self-recovery capability, so that huge economic loss is caused if the transformer substation equipment is damaged due to lightning accidents. The existing standard specification gives many instructive opinions on the electrical performance indexes and the test technical indexes of related electrical equipment in the transformer substation, and many students also carry out a great deal of research work on the electrical characteristics and the failure mechanism of the electrical equipment such as a lightning arrester, a circuit breaker and the like under the lightning impact, so that a great research result is obtained. However, most of the current relevant standards and researches are based on single lightning stroke or multiple lightning strokes separated by a certain time to carry out work, and the performance analysis of electrical equipment under continuous lightning strokes is relatively less.
Continuous lightning stroke is a common phenomenon in nature, and compared with single lightning stroke, the continuous lightning stroke generally refers to continuous lightning strike with a time interval not exceeding 0.1s and a lightning strike position not exceeding 1km, and includes continuous lightning strike or multiple lightning strikes in a short time. The statistical results show that: the continuous lightning strike frequency in the continuous lightning is 2-6 times and accounts for most parts (about 89.53% of all continuous lightning strikes), and the lightning current generally has a negative polarity amplitude range of 5 kA-50 kA.
The damage of the lightning invasion wave of continuous lightning stroke to the circuit breaker and the line arrester on the line side of the transformer substation has become a new problem which is more and more emphasized. When continuous lightning strikes act on a transformer substation or a wire, if the current amplitude of the continuous lightning strikes is large, the lightning impact energy absorbed by the lightning arrester easily exceeds the through-current capacity of the lightning impact energy, and then the electrical energy is overloaded. The circuit breaker also can trip out after the first thunderbolt, when being in the running state of hot reserve, the bus metal oxide arrester can't form good protection to the circuit breaker, if the circuit suffers the thunderbolt again, takes place accidents such as inside breakdown and outer insulation flashover circuit breaker very easily. Therefore, how to evaluate the lightning invasion wave level of the substation electrical equipment for resisting continuous lightning strokes provides guidance for the insulation cooperation of a newly built station and the insulation cooperation optimization of a modified station, and the method has important significance.
Disclosure of Invention
In order to solve the problems in the prior art, the invention provides an assessment method for the level of lightning invasion waves of electrical equipment of a transformer substation for resisting continuous lightning strokes. In order to achieve the purpose of the invention, the technical scheme of the invention is as follows.
A method for evaluating the level of lightning intrusion waves of electrical equipment of a transformer substation against continuous lightning strikes comprises the following steps:
the method comprises the steps of obtaining lightning stroke monitoring data of a power transmission line, and calculating overvoltage, lightning current amplitude and lightning wave impedance of electrical equipment of a transformer substation caused by lightning invasion waves in each lightning stroke based on the lightning stroke monitoring data;
acquiring running state data of the transformer substation, and calculating a rated lightning withstand voltage value Ub of electrical equipment of the transformer substation based on the running state data;
according to Un＝αn·In·ZnCalculating overvoltage U of electrical equipment of the transformer substation caused by lightning intrusion wave in the nth lightning strokenWherein, InIs the nth lightning current amplitude, ZnIs the impedance of lightning waves, αnIs the attenuation coefficient;
will be over-voltage U at the 1 st lightning stroke1Rated lightning withstand voltage value U of electrical equipment of transformer substationbMaking a comparison if U1Less than UbObtaining that the electrical equipment of the transformer substation can resist overvoltage during the 1 st lightning stroke; if U is1Greater than UbWill be over-voltage U in the 2 nd lightning stroke2Actual lightning withstand voltage value U of electrical equipment of transformer substationsMaking a comparison if U2Less than UsObtaining the overvoltage when the electrical equipment of the transformer substation resists the 2 nd lightning stroke, if U2Greater than UsAnd analogizing in turn the overvoltage U at the mth lightning strokemActual lightning withstand voltage value U of electrical equipment of transformer substationxComparing; wherein m is more than 2 and less than n;
preferably, the lightning strike monitoring data comprises: the lightning protection method comprises the steps of the number of a lightning struck power transmission line tower, the lightning strike time, the lightning strike mode and lightning information, wherein the lightning strike mode comprises lightning strike lightning conductor data, lightning strike tower data and lightning strike power transmission conductor data, and the lightning strike information comprises a lightning current amplitude and the number of strike-back times of subsequent continuous lightning strikes.
Preferably, the operation state data includes: the operation state data of the transformer substation comprises the voltage grade of the transformer substation, the wiring mode of the transformer substation and the electrical equipment parameters of the transformer substation.
Preferably, the actual lightning withstand voltage value Us＝β·UbWherein the insulation recovery coefficient of the electrical equipment of the beta transformer substation is more than 0 and less than 1.
Compared with the prior art, the invention has the beneficial technical effects that:
1. the method provided by the invention considers the continuous lightning stroke working condition, the damage probability of the electrical equipment of the transformer substation is higher under the working condition, and the working condition is rarely considered in the prior art, so that the evaluation of the level of the electrical equipment of the transformer substation for resisting the lightning invasion wave of the continuous lightning stroke is a blank field.
2. The method divides the continuous lightning stroke into the 1 st and subsequent strike-back times, independently analyzes the working condition of each lightning stroke condition, considers the cumulative effect caused by the last lightning stroke, and has more accuracy in the calculation result.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present application clearer, the technical solutions in the embodiments of the present application are clearly and completely described below, and it is obvious that the described embodiments are only a part of the embodiments of the present application, and not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments of the present application without making any creative effort, shall fall within the protection scope of the present application.
The method for evaluating the level of lightning invasion waves of the electrical equipment of the transformer substation for resisting continuous lightning strokes comprises the following steps:
obtaining operation state data of the transformer substation, and calculating rated lightning withstand voltage value U of electrical equipment of the transformer substation based on the operation state datab；
According to Un＝αn·In·ZnCalculating overvoltage U of electrical equipment of the transformer substation caused by lightning intrusion wave in the nth lightning strokenWherein, InIs the nth lightning current amplitude, ZnIs the impedance of lightning waves, αnIs the attenuation coefficient;
will be over-voltage U at the 1 st lightning stroke1Rated lightning withstand voltage value U of electrical equipment of transformer substationbMaking a comparison if U1Less than UbObtaining that the electrical equipment of the transformer substation can resist overvoltage during the 1 st lightning stroke; if U is1Greater than UbWill be over-voltage U in the 2 nd lightning stroke2Actual lightning withstand voltage value U of electrical equipment of transformer substationsMaking a comparison if U2Less than UsObtaining the overvoltage when the electrical equipment of the transformer substation resists the 2 nd lightning stroke, if U2Greater than UsAnd analogizing in turn the overvoltage U at the mth lightning strokemActual lightning withstand voltage value U of electrical equipment of transformer substationxComparing; wherein m is more than 2 and less than n;
the actual lightning withstand voltage value Us＝β·UbWherein the insulation recovery coefficient of the electrical equipment of the beta transformer substation is more than 0 and less than 1. For example, β is 0.8.
Specifically, the method comprises the following steps: firstly, acquiring lightning stroke monitoring data and lightning positioning system monitoring data of an actually measured power transmission line body, and analyzing to obtain the number of a tower, the lightning stroke time (accurate to millisecond level), the lightning stroke mode (including lightning stroke lightning conductor data, lightning stroke tower data and lightning stroke power transmission conductor data) and lightning information (including lightning current amplitude, the number of return strokes of subsequent continuous lightning strokes and the like) of a certain address within the range of 1km in diameter.
And secondly, acquiring relevant data of the running state of the transformer substation to be calculated, wherein the relevant data comprises the voltage grade of the transformer substation, the wiring mode of the transformer substation, the parameters of electrical equipment of the transformer substation, the real-time running mode, the configuration condition of a lightning arrester of the transformer substation, the electrical distance of the electrical equipment of the transformer substation and the like.
Thirdly, calculating the overvoltage of the electrical equipment of the transformer substation caused by the lightning invasion wave of the continuous lightning stroke, and setting the 1 st lightning current amplitude of the continuous lightning stroke as I0A, lightning wave impedance is Z0Omega, the lightning intrusion wave voltage U of the lightning strike pointT＝I0·Z0(ii) a Considering the effects of lightning current shunting effect, transmission attenuation effect of a power transmission line, voltage limitation of a lightning arrester and the like after the tower is struck by lightning in the 1 st lightning stroke, the attenuation coefficient alpha is set0If the overvoltage of the circuit breaker, the CT and other equipment in the power station is U when the 1 st lightning stroke occurs1＝α0·I0·Z0。
2 nd lightning current of continuous lightning strikeAmplitude of I1A, lightning wave impedance is Z1Omega, the lightning intrusion wave voltage UT at the lightning strike point is I1·Z1(ii) a The method includes the steps of considering the effects of lightning current shunting effect, transmission attenuation effect of a power transmission line, voltage limitation of a lightning arrester and the like after lightning strikes on a tower in the 2 nd lightning strike, considering relay protection action possibly caused in the 1 st lightning strike, enabling part of circuit breakers to be in an off state, changing the operation mode of a transformer substation, forming total reflection lifting overvoltage amplitude at the circuit breakers by lightning invasion waves, comprehensively considering gain and attenuation conditions, and setting a coefficient alpha1And the overvoltage of the circuit breaker, the CT and other equipment in the power station is U when the 2 nd lightning stroke is changed2＝α1·I1·Z1. In a similar way, the 3 rd and/or nth lightning stroke overvoltage values U of the circuit breaker and the CT can be calculated3，......Un。
Fourthly, evaluating the lightning invasion level of the electrical equipment of the transformer substation for resisting continuous lightning strokes, wherein the overvoltage U is over-voltage at the 1 st lightning stroke1Lightning withstand voltage U corresponding to rated equipmentbMaking a comparison if U1Less than UbAnd considering that the equipment can resist overvoltage at the 1 st lightning stroke, otherwise, the equipment cannot resist. For overvoltage U in 2 nd lightning stroke2Considering that the equipment is insulated and pressure-bearing during the 1 st lightning stroke and is not completely recovered, the actual lightning withstand voltage value Us of the equipment is greatly lower than the rated lightning withstand voltage value UbThen U isb2Should correspond to the actual lightning withstand voltage value U of the equipmentsMaking a comparison if Ub2Less than UsAnd considering that the equipment can resist overvoltage at the 1 st lightning stroke, otherwise, the equipment cannot resist. Similarly, the level of the intrusion wave can be calculated from the 3 rd strike to the nth strike. If each lightning stroke can be borne, the electrical equipment of the transformer substation can resist the lightning invasion waves of the continuous lightning stroke, otherwise, the electrical equipment of the transformer substation cannot bear the lightning invasion waves.
The above-mentioned embodiments are only specific embodiments of the present application, and are used for illustrating the technical solutions of the present application, but not limiting the same, and the scope of the present application is not limited thereto, and although the present application is described in detail with reference to the foregoing embodiments, those skilled in the art should understand that: any person skilled in the art can modify or easily conceive the technical solutions described in the foregoing embodiments or equivalent substitutes for some technical features within the technical scope disclosed in the present application; such modifications, changes or substitutions do not depart from the spirit and scope of the present disclosure, which should be construed in light of the above teachings. Are intended to be covered by the scope of the present application. Therefore, the protection scope of the present application shall be subject to the protection scope of the claims.
Claims (4)
1. A method for evaluating the level of lightning intrusion waves of electrical equipment of a transformer substation against continuous lightning strikes is characterized by comprising the following steps:
the method comprises the steps of obtaining lightning stroke monitoring data of a power transmission line, and calculating overvoltage, lightning current amplitude and lightning wave impedance of electrical equipment of a transformer substation caused by lightning invasion waves in each lightning stroke based on the lightning stroke monitoring data;
obtaining operation state data of the transformer substation, and calculating rated lightning withstand voltage value U of electrical equipment of the transformer substation based on the operation state datab；
According to Un＝αn·In·ZnCalculating overvoltage U of electrical equipment of the transformer substation caused by lightning intrusion wave in the nth lightning strokenWherein, InIs the nth lightning current amplitude, ZnIs the impedance of lightning waves, αnIs the attenuation coefficient;
will be over-voltage U at the 1 st lightning stroke1Rated lightning withstand voltage value U of electrical equipment of transformer substationbMaking a comparison if U1Less than UbObtaining that the electrical equipment of the transformer substation can resist overvoltage during the 1 st lightning stroke; if U is1Greater than UbWill be over-voltage U in the 2 nd lightning stroke2Actual lightning withstand voltage value U of electrical equipment of transformer substationsMaking a comparison if U2Less than UsObtaining the overvoltage when the electrical equipment of the transformer substation resists the 2 nd lightning stroke, if U2Greater than UsAnd analogizing in turn the overvoltage U at the mth lightning strokemActual lightning withstand voltage value U of electrical equipment of transformer substationxComparing; therein, 2<m<n。
2. A method of assessing a level of lightning intrusion of a substation electrical device against successive lightning strikes according to claim 1, the lightning strike monitoring data comprising: the lightning protection method comprises the steps of the number of a lightning struck power transmission line tower, the lightning strike time, the lightning strike mode and lightning information, wherein the lightning strike mode comprises lightning strike lightning conductor data, lightning strike tower data and lightning strike power transmission conductor data, and the lightning strike information comprises a lightning current amplitude and the number of strike-back times of subsequent continuous lightning strikes.
3. A method of assessing the level of lightning intrusion of a substation electrical device against successive lightning strikes according to claim 1, the operational status data comprising: the operation state data of the transformer substation comprises the voltage grade of the transformer substation, the wiring mode of the transformer substation and the electrical equipment parameters of the transformer substation.
4. Method for assessing the level of lightning intrusion of an electrical substation equipment against successive lightning strikes according to any one of claims 1 to 3, said actual lightning withstand voltage value Us＝β·UbWherein the insulation recovery coefficient of the electrical equipment of the beta substation, 0<β<1。
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011586683.5A CN112798853B (en) | 2020-12-28 | 2020-12-28 | Assessment method for lightning invasion wave level of substation electrical equipment for resisting continuous lightning stroke |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011586683.5A CN112798853B (en) | 2020-12-28 | 2020-12-28 | Assessment method for lightning invasion wave level of substation electrical equipment for resisting continuous lightning stroke |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN112798853A true CN112798853A (en) | 2021-05-14 |
| CN112798853B CN112798853B (en) | 2022-05-27 |
Family
ID=75806048
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202011586683.5A Active CN112798853B (en) | 2020-12-28 | 2020-12-28 | Assessment method for lightning invasion wave level of substation electrical equipment for resisting continuous lightning stroke |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN112798853B (en) |
Citations (12)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2000166079A (en) * | 1998-11-30 | 2000-06-16 | Nec Corp | Lightning surge protective circuit |
| JP2003143749A (en) * | 2001-11-02 | 2003-05-16 | Ace Lion Kk | Inside lightning protective device |
| CN103048598A (en) * | 2012-12-21 | 2013-04-17 | 广州供电局有限公司 | Method and device for evaluating lightning protection performance of back striking of poles and towers of transmission line |
| KR20140029865A (en) * | 2012-08-30 | 2014-03-11 | 한국전력공사 | Apparatus and method of evaluating performance for lightning protection in distribution lines |
| CN103743968A (en) * | 2013-12-17 | 2014-04-23 | 上海交通大学 | Metal oxide arrester multiple-lightning-current withstand test method |
| CN105067911A (en) * | 2015-07-23 | 2015-11-18 | 国网电力科学研究院武汉南瑞有限责任公司 | Intelligent transformer station light current system lightning protection performance assessing method |
| CN106443144A (en) * | 2015-08-11 | 2017-02-22 | 中国电力科学研究院 | Distributed transient overvoltage monitoring system for EHV (extra-high voltage) GIS |
| CN107728016A (en) * | 2017-09-05 | 2018-02-23 | 国网上海市电力公司 | A kind of multiple lightning current operating duty cycle test method of Surge Protector |
| CN110161304A (en) * | 2019-05-27 | 2019-08-23 | 国网浙江省电力有限公司电力科学研究院 | A kind of multiple thunder acts on the calculation method of lower leakage conductor absorption energy and residual voltage |
| CN110488165A (en) * | 2019-08-29 | 2019-11-22 | 南方电网科学研究院有限责任公司 | A kind of lightning discharge comprehensive analysis method, device, terminal device and storage medium |
| CN211826326U (en) * | 2020-03-11 | 2020-10-30 | 南宁超伏电气科技有限公司 | Test system for simulating multiple lightning strokes |
| CN112067987A (en) * | 2020-09-16 | 2020-12-11 | 广东电网有限责任公司电力科学研究院 | Method and device for judging breaker fracture breakdown under continuous lightning stroke |
-
2020
- 2020-12-28 CN CN202011586683.5A patent/CN112798853B/en active Active
Patent Citations (12)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2000166079A (en) * | 1998-11-30 | 2000-06-16 | Nec Corp | Lightning surge protective circuit |
| JP2003143749A (en) * | 2001-11-02 | 2003-05-16 | Ace Lion Kk | Inside lightning protective device |
| KR20140029865A (en) * | 2012-08-30 | 2014-03-11 | 한국전력공사 | Apparatus and method of evaluating performance for lightning protection in distribution lines |
| CN103048598A (en) * | 2012-12-21 | 2013-04-17 | 广州供电局有限公司 | Method and device for evaluating lightning protection performance of back striking of poles and towers of transmission line |
| CN103743968A (en) * | 2013-12-17 | 2014-04-23 | 上海交通大学 | Metal oxide arrester multiple-lightning-current withstand test method |
| CN105067911A (en) * | 2015-07-23 | 2015-11-18 | 国网电力科学研究院武汉南瑞有限责任公司 | Intelligent transformer station light current system lightning protection performance assessing method |
| CN106443144A (en) * | 2015-08-11 | 2017-02-22 | 中国电力科学研究院 | Distributed transient overvoltage monitoring system for EHV (extra-high voltage) GIS |
| CN107728016A (en) * | 2017-09-05 | 2018-02-23 | 国网上海市电力公司 | A kind of multiple lightning current operating duty cycle test method of Surge Protector |
| CN110161304A (en) * | 2019-05-27 | 2019-08-23 | 国网浙江省电力有限公司电力科学研究院 | A kind of multiple thunder acts on the calculation method of lower leakage conductor absorption energy and residual voltage |
| CN110488165A (en) * | 2019-08-29 | 2019-11-22 | 南方电网科学研究院有限责任公司 | A kind of lightning discharge comprehensive analysis method, device, terminal device and storage medium |
| CN211826326U (en) * | 2020-03-11 | 2020-10-30 | 南宁超伏电气科技有限公司 | Test system for simulating multiple lightning strokes |
| CN112067987A (en) * | 2020-09-16 | 2020-12-11 | 广东电网有限责任公司电力科学研究院 | Method and device for judging breaker fracture breakdown under continuous lightning stroke |
Non-Patent Citations (2)
| Title |
|---|
| 郝建成 等: "线路遭受连续雷击对线路断路器的影响", 《东北电力技术》 * |
| 钱海 等: "500 kV断路器多重雷击事故分析", 《南方电网技术》 * |
Also Published As
| Publication number | Publication date |
|---|---|
| CN112798853B (en) | 2022-05-27 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN105242133B (en) | A kind of improvement distribution line lightning trip-out rate calculation method | |
| CN104808109B (en) | Based on ultra-high-tension power transmission line fault recognition method and the system of recorder data | |
| CN105426671B (en) | The reliability evaluating method of overhead distribution under a kind of Thunderstorm Weather | |
| CN112785117B (en) | Multidimensional analysis method for risk of full-line lightning shielding failure tripping of power transmission line | |
| CN102175936B (en) | Unrestrictive expected operation life assessment method for distribution network lightning arrester under given confidence level | |
| CN110879333B (en) | High-voltage direct-current transmission line lightning stroke restart rate calculation and evaluation method | |
| CN104319733A (en) | Neutral point grounding impedance device of transformer and multipurpose direct current magnetic bias protection method of impedance device | |
| CN112257238B (en) | Method and device for evaluating insulation damage risk of circuit breaker under multiple thunder | |
| CN111880046A (en) | Device and method for quickly identifying line fault reason | |
| Malcolm et al. | Analysis of transient overvoltage phenomena due to direct lightning strikes on wind turbine blade | |
| CN110320422B (en) | Line arrester action reliability assessment method based on multi-parameter fusion | |
| CN101320066A (en) | Thunderbolt attack distance of electric power transmission line lightning shielding failure based on electric geometric model and method for confirming the same | |
| CN112798853B (en) | Assessment method for lightning invasion wave level of substation electrical equipment for resisting continuous lightning stroke | |
| Lopes et al. | A procedure to evaluate the risk of failure of distribution transformers insulation due to lightning induced voltages | |
| CN110765666A (en) | Simulation method for indirect breakdown fault of power transmission line caused by lightning stroke due to bifurcated lightning | |
| CN101122623A (en) | High voltage electricity transmission system thunder-proof property parameter test method | |
| CN115098899A (en) | Multi-lightning risk grading method considering equipment difference and storage medium | |
| CN113178852B (en) | Insulation matching method, device, equipment and medium for lightning invasion waves of transformer substation | |
| CN113447768B (en) | Method and device for evaluating insulation level of circuit breaker under multiple thunder | |
| CN113804978B (en) | Lightning stroke waveform identification method based on fault indicator | |
| CN114172131B (en) | Distribution line lightning stroke section fault evaluation method and system | |
| Hosseini et al. | Reliability Analysis of Surge Arrester Location Effect in High voltage substations | |
| D'Orazio et al. | New tool for the improvement of maintenance and expected life monitoring procedures of surge arresters installed on overhead MV lines | |
| Zhao et al. | Research on Continuous Lightning Strokes Analysis and Protection of 220kV Substation | |
| CN116794437A (en) | Lightning arrester degradation judgment method, device, electronic equipment and storage medium |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |