Optimal configuration method, system and equipment of circuit breaker insulation coordination arrester

Abstract

The application relates to the technical field of lightning protection of power system substation equipment, and discloses an optimization configuration method, system and equipment of a lightning arrester for circuit breaker insulation coordination. According to the maximum lightning current of the three-phase wire of the tower of the incoming line section in the station, the target phase wire for installing the lightning arrester is determined; the number of the lightning arrester is gradually increased from the preset initial value, the lightning arrester configuration scheme under different numbers of the lightning arrester is designed according to the target phase wire and the distances from the towers of the incoming line sections in the station to the substation; the overvoltage level of the circuit breaker under each lightning arrester configuration scheme is simulated and analyzed, the simulation result is compared with the rated lightning impulse withstand level of the circuit breaker, and the corresponding comparison result is obtained; if there is a lightning arrester configuration scheme with the overvoltage level of the circuit breaker being lower than the rated lightning impulse withstand level of the circuit breaker, the optimal lightning arrester configuration scheme is determined according to the comparison result. The application can guarantee the lightning protection effect and make the lightning arrester configuration more scientific, economic and reasonable.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of lightning protection of power system substation equipment, and particularly relates to an optimal configuration method, system and equipment of a lightning arrester for circuit breaker insulation coordination. BACKGROUND

[0002] The circuit breaker failure accidents caused by lightning account for a high proportion, and lightning arresters need to be installed on the lines of the substation to protect the circuit breakers.

[0003] The configuration of the lightning arrester directly affects the lightning overvoltage and insulation coordination of the circuit breaker, and plays a crucial role in the safe and stable operation of the circuit breaker. The existing lightning arrester configuration scheme is generally to install a non-gap lightning arrester at the line side of the circuit breaker in the substation. At this time, as long as the installed lightning arrester works normally, the overvoltage level of the circuit breaker can be limited within a safe range. However, due to the limitation of the substation site, the actual circuit breaker line side in the substation may not have the condition to install a lightning arrester. At this time, a gap lightning arrester needs to be installed on the tower conductor of the incoming line section. The existing scheme of installing a lightning arrester on the tower conductor of the incoming line section is generally to select the configuration according to experience or to configure all phases. Most of them do not fully consider the lightning protection effect and the economy of the scheme under the structure characteristics of the actual tower and the topographic factors, and have a certain blindness. SUMMARY

[0004] The present application provides an optimal configuration method, system and equipment of a lightning arrester for circuit breaker insulation coordination, which solves the technical problem of how to optimally configure the lightning arrester for circuit breaker insulation coordination considering the lightning protection effect and economic factors.

[0005] The present application provides an optimal configuration method, system and equipment of a lightning arrester for circuit breaker insulation coordination, which solves the technical problem of how to optimally configure the lightning arrester for circuit breaker insulation coordination considering the lightning protection effect and economic factors.

[0006] Obtain the maximum shielding lightning current of the three-phase tower conductor of the incoming line section in the substation, and determine the target phase conductor for installing the lightning arrester from the obtained maximum shielding lightning current in the corresponding A-phase conductor, B-phase conductor and C-phase conductor;

[0007] Start from the preset initial value to gradually increase the number of lightning arresters, until the number reaches the upper limit, and design lightning arrester configuration schemes under different numbers of lightning arresters according to the target phase conductor and the distance from each incoming line section tower in the substation to the substation;

[0008] Simulate and analyze the overvoltage level of the circuit breaker under each lightning arrester configuration scheme, compare the simulated overvoltage level of the circuit breaker with the rated lightning impulse withstand level of the circuit breaker, and obtain the corresponding comparison result;

[0009] If there is a configuration scheme of the arrester in which the circuit breaker overvoltage level is lower than the rated lightning impulse withstand level of the circuit breaker, the optimal arrester configuration scheme is determined according to the comparison result.

[0010] According to an implementable manner of the first aspect of the application, the target phase conductor for installing the arrester is determined from the obtained maximum shielding lightning currents in the corresponding A-phase conductor, B-phase conductor and C-phase conductor, comprising:

[0011] The maximum value of the maximum shielding lightning currents in the three-phase conductors of the in-station incoming line section tower is determined, and the phase conductor corresponding to the maximum value is taken as the target phase conductor of the corresponding incoming line section tower.

[0012] According to an implementable manner of the first aspect of the application, the arrester configuration schemes under different arrester installation quantities are designed according to the target phase conductor and the distances from the in-station incoming line section towers to the substation, comprising:

[0013] According to the order from near to far of the distances from the incoming line section towers to the substation, the incoming line section tower corresponding to the current arrester installation quantity is selected as the target tower from the in-station incoming line section towers.

[0014] One arrester is installed at the target phase conductor of each target tower, and an arrester scheme under the current arrester installation quantity is formed.

[0015] According to an implementable manner of the first aspect of the application, the circuit breaker overvoltage levels under each arrester configuration scheme are simulated and analyzed, comprising:

[0016] The circuit breaker overvoltage levels under each arrester configuration scheme are simulated and analyzed in turn according to the order from small to large of the arrester installation quantities.

[0017] The optimal arrester configuration scheme is determined according to the comparison result, comprising:

[0018] When the arrester configuration scheme in which the circuit breaker overvoltage level is lower than the rated lightning impulse withstand level of the circuit breaker is first found, the corresponding arrester configuration scheme is taken as the optimal arrester configuration scheme.

[0019] According to an implementable manner of the first aspect of the application, the optimal arrester configuration scheme is determined according to the comparison result, comprising:

[0020] According to the comparison result corresponding to each arrester configuration scheme, the arrester configuration scheme in which the circuit breaker overvoltage level is lower than the rated lightning impulse withstand level of the circuit breaker is classified into a first alternative scheme set.

[0021] Determine the arrester configuration scheme with the minimum number of installed arresters from the first alternative scheme set as the optimal arrester configuration scheme.

[0022] According to an implementable manner of the first aspect of the application, the method further comprises:

[0023] If there is no arrester configuration scheme with a circuit breaker overvoltage level lower than the rated lightning impulse withstand level of the circuit breaker, the overvoltage level rise difference value corresponding to each arrester configuration scheme is calculated according to the following formula:

[0024] ΔU k-1 = U k-1 - U k

[0025] In the formula, ΔU k-1 represents the overvoltage level rise difference value corresponding to the arrester configuration scheme with the number of installed arresters being k-1, U k-1 is the circuit breaker overvoltage level corresponding to the arrester configuration scheme with the number of installed arresters being k-1, U k is the circuit breaker overvoltage level corresponding to the arrester configuration scheme with the number of installed arresters being k.

[0026] The arrester configuration scheme with an overvoltage level rise difference value not less than a preset voltage threshold is classified into a second alternative scheme set.

[0027] Determine the arrester configuration scheme with the minimum number of installed arresters from the second alternative scheme set as the optimal arrester configuration scheme.

[0028] According to an implementable manner of the first aspect of the application, the method further comprises:

[0029] If there is no arrester configuration scheme with a circuit breaker overvoltage level lower than the rated lightning impulse withstand level of the circuit breaker, and there is no arrester configuration scheme with an overvoltage level rise difference value not less than a preset voltage threshold, the arrester configuration scheme with the maximum overvoltage level rise difference value is determined as the optimal arrester configuration scheme.

[0030] The second aspect of the application provides an optimal configuration system of an arrester for insulating coordination of a circuit breaker, comprising:

[0031] A target phase conductor determination module is configured to acquire the maximum shielding lightning current of a three-phase conductor of a tower on a station incoming line segment, and determine a target phase conductor for installing an arrester from the corresponding A-phase conductor, B-phase conductor and C-phase conductor according to the acquired maximum shielding lightning current.

[0032] The surge arrester configuration scheme design module is used to gradually increase the number of surge arresters installed from a preset initial value until the number of installations reaches the upper limit. Based on the target phase conductor and the distance from each incoming line section tower to the substation, the module designs surge arrester configuration schemes for different numbers of surge arresters installed.

[0033] The overvoltage level simulation comparison module is used to simulate and analyze the overvoltage level of the circuit breaker under various surge arrester configuration schemes, and compare the simulated overvoltage level of the circuit breaker with the rated lightning impulse withstand level of the circuit breaker to obtain the corresponding comparison results.

[0034] The first optimal solution determination module is used to determine the optimal surge arrester configuration scheme based on the comparison results when there is a surge arrester configuration scheme where the circuit breaker overvoltage level is lower than the circuit breaker's rated lightning impulse withstand level.

[0035] According to one achievable embodiment of the second aspect of the present invention, the target phase conductor determination module comprises:

[0036] The target phase conductor determination unit is used to determine the maximum value of the three-phase lightning strike current of the incoming line section tower conductors within the station, and to take the phase conductor corresponding to the maximum value of the maximum lightning strike current as the target phase conductor of the corresponding incoming line section tower.

[0037] According to one achievable method of the second aspect of the present invention, the surge arrester configuration design module includes:

[0038] The tower selection unit is used to select the target tower from the incoming line towers in the substation according to the order of the distance from the incoming line tower to the substation from near to far.

[0039] The scheme forming unit is used to install a surge arrester at the target phase conductor of each of the target towers to form a surge arrester scheme with the current number of surge arresters installed.

[0040] According to one embodiment of the second aspect of the present invention, the overvoltage level simulation comparison module includes:

[0041] The simulation analysis unit is used to perform simulation analysis on the overvoltage level of the circuit breaker under each surge arrester configuration scheme in ascending order of the number of surge arresters installed.

[0042] The first optimal solution determination module includes:

[0043] The first scheme determination unit is used to determine the optimal surge arrester configuration scheme when the overvoltage level of the circuit breaker is found to be lower than the rated lightning impulse withstand level of the circuit breaker.

[0044] According to an implementable manner of the second aspect of the present application, the first optimal scheme determining module comprises:

[0045] A scheme selection unit is configured to, according to the comparison results corresponding to each arrester configuration scheme, classify the arrester configuration scheme with the circuit breaker overvoltage level lower than the rated lightning impulse withstand level of the circuit breaker into the first candidate scheme set.

[0046] A second scheme determining unit is configured to determine, from the first candidate scheme set, the arrester configuration scheme with the minimum number of installed arresters as the optimal arrester configuration scheme.

[0047] According to an implementable manner of the second aspect of the present application, the system further comprises:

[0048] A calculating module is configured to, if there is no arrester configuration scheme with the circuit breaker overvoltage level lower than the rated lightning impulse withstand level of the circuit breaker, calculate the overvoltage level rise difference value corresponding to each arrester configuration scheme according to the following formula:

[0049] ΔU k-1 = U k-1 - U k

[0050] In the formula, ΔU k-1 represents the overvoltage level rise difference value corresponding to the arrester configuration scheme with the number of installed arresters being k-1, U k-1 represents the circuit breaker overvoltage level corresponding to the arrester configuration scheme with the number of installed arresters being k-1, U k represents the circuit breaker overvoltage level corresponding to the arrester configuration scheme with the number of installed arresters being k.

[0051] A scheme selection module is configured to classify the arrester configuration scheme with the overvoltage level rise difference value not less than the preset voltage threshold value into the second candidate scheme set.

[0052] A second optimal scheme determining module is configured to determine, from the second candidate scheme set, the arrester configuration scheme with the minimum number of installed arresters as the optimal arrester configuration scheme.

[0053] According to an implementable manner of the second aspect of the present application, the system further comprises:

[0054] A third optimal scheme determining module is configured to, if there is no arrester configuration scheme with the circuit breaker overvoltage level lower than the rated lightning impulse withstand level of the circuit breaker and there is no arrester configuration scheme with the overvoltage level rise difference value not less than the preset voltage threshold value, determine the arrester configuration scheme with the maximum overvoltage level rise difference value as the optimal arrester configuration scheme.

[0055] The third aspect of the present application provides a device for optimizing configuration of a lightning arrester for insulating coordination of a circuit breaker, comprising:

[0056] a memory for storing instructions; wherein the instructions are used to implement the method for optimizing configuration of a lightning arrester for insulating coordination of a circuit breaker as enabled by any of the above;

[0057] a processor for executing the instructions in the memory.

[0058] The fourth aspect of the present application provides a computer-readable storage medium, wherein the computer-readable storage medium stores a computer program, and the computer program is executed by a processor to implement the method for optimizing configuration of a lightning arrester for insulating coordination of a circuit breaker as enabled by any of the above.

[0059] From the above technical solutions, the present application has the following advantages:

[0060] According to the present application, the target phase conductor for installing a lightning arrester is determined from the corresponding A-phase conductor, B-phase conductor and C-phase conductor according to the maximum shielding failure lightning current of the three-phase conductor of a tower in a line section; the number of installed lightning arresters is gradually increased from a preset initial value until the number reaches an upper limit, and the lightning arrester configuration scheme under different numbers of installed lightning arresters is designed according to the target phase conductor and the distance from each tower in a line section to a substation; the circuit breaker overvoltage level under each lightning arrester configuration scheme is simulated and analyzed, the simulated circuit breaker overvoltage level is compared with the rated lightning impulse withstand level of the circuit breaker, and the corresponding comparison result is obtained; if there is a lightning arrester configuration scheme in which the circuit breaker overvoltage level is lower than the rated lightning impulse withstand level of the circuit breaker, the optimal lightning arrester configuration scheme is determined according to the comparison result; according to the present application, the target phase conductor for installing a lightning arrester is determined according to the maximum shielding failure lightning current, which realizes the optimization of the installation position of the lightning arrester, and based on the simulation data of the circuit breaker overvoltage level under different lightning arrester configuration schemes, the optimal lightning arrester configuration scheme is determined, which realizes the optimization of the number of installed lightning arresters, and can solve the technical problem of optimizing configuration of a lightning arrester for insulating coordination of a circuit breaker considering the lightning protection effect and economic factors. BRIEF DESCRIPTION OF DRAWINGS

[0061] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the following will briefly introduce the drawings needed to be used in the embodiments or prior art description. Obviously, the drawings in the following description are only some embodiments of the present application, and for those skilled in the art, other drawings can also be obtained without creative labor.

[0062] Figure 1A flow chart of an optimal configuration method of a lightning arrester for insulating coordination of a circuit breaker is provided for an optional embodiment of the present application.

[0063] Figure 2 A flow chart of an optimal configuration method of a lightning arrester for insulating coordination of a circuit breaker is provided for another optional embodiment of the present application.

[0064] Figure 3 A flow chart of an optimal configuration method of a lightning arrester for insulating coordination of a circuit breaker is provided for still another optional embodiment of the present application.

[0065] Figure 4 A structure connection block diagram of an optimal configuration system of a lightning arrester for insulating coordination of a circuit breaker is provided for an optional embodiment of the present application.

[0066] Figure 5 A structure connection block diagram of an optimal configuration system of a lightning arrester for insulating coordination of a circuit breaker is provided for another optional embodiment of the present application.

[0067] Figure 6 A structure connection block diagram of an optimal configuration system of a lightning arrester for insulating coordination of a circuit breaker is provided for still another optional embodiment of the present application.

[0068] Reference signs:

[0069] 1 - target phase conductor determination module; 2 - lightning arrester configuration scheme design module; 3 - overvoltage level simulation comparison module; 4 - first optimal scheme determination module; 5 - calculation module; 6 - scheme selection module; 7 - second optimal scheme determination module; 8 - third optimal scheme determination module. DETAILED DESCRIPTION

[0070] The embodiments of the present application provide an optimal configuration method, system and device of a lightning arrester for insulating coordination of a circuit breaker, and solve the technical problem of how to optimally configure a lightning arrester for insulating coordination of a circuit breaker considering lightning protection effect and economic factors.

[0071] In order to make the technical scheme of the present application clearer and easier to understand, the technical scheme in the embodiments of the present application will be described clearly and completely below with reference to the drawings in the embodiments of the present application. Obviously, the embodiments described below are only some of the embodiments of the present application, but not all the embodiments of the present application. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative work fall within the scope of the present application.

[0072] The present application provides an optimal configuration method of a lightning arrester for insulating coordination of a circuit breaker.

[0073] Please refer to Figure 1 ,Figure 1 A flow chart of an optimal configuration method of a lightning arrester for insulating coordination of a circuit breaker is shown.

[0074] The optimal configuration method of a lightning arrester for insulating coordination of a circuit breaker provided by the embodiment of the present application comprises steps S1-S4.

[0075] In step S1, the maximum shielding failure current of the three-phase conductor of the tower in the incoming line section is obtained, and the target phase conductor for installing the lightning arrester is determined from the A-phase conductor, the B-phase conductor and the C-phase conductor according to the obtained maximum shielding failure current.

[0076] In an implementable manner, the target phase conductor for installing the lightning arrester is determined from the A-phase conductor, the B-phase conductor and the C-phase conductor according to the obtained maximum shielding failure current, which comprises:

[0077] The maximum value of the maximum shielding failure current of the three-phase conductor of the tower in the incoming line section is determined, and the phase conductor corresponding to the maximum value is taken as the target phase conductor of the tower corresponding to the incoming line section.

[0078] The maximum shielding failure current IrmaxA of the A-phase conductor of the tower in the incoming line section, the maximum shielding failure current IrmaxB of the B-phase conductor of the tower in the incoming line section and the maximum shielding failure current IrmaxC of the C-phase conductor of the tower in the incoming line section can be determined through the electrical geometric model corresponding to the circuit breaker, and then the maximum value is selected from IrmaxA, IrmaxB and IrmaxC, and the phase conductor corresponding to the maximum value is taken as the target phase conductor of the tower corresponding to the incoming line section. For example, when the maximum shielding failure current of the B-phase conductor of the tower in the incoming line section is the maximum, the B-phase conductor of the tower in the incoming line section is taken as the target phase conductor, and the lightning arrester is installed on the B-phase conductor.

[0079] When one lightning arrester is installed on each target phase conductor of the tower in the incoming line section, the overvoltage level on the circuit breaker in the substation is the lowest. However, this method may result in excessive installation of lightning arresters. Considering the installation cost, it is necessary to determine the number of lightning arresters to be installed on the target phase conductors of the towers in the incoming line section to achieve the optimal technical and economic effect. Based on this, the embodiment further comprises subsequent steps to determine the optimal number of lightning arresters.

[0080] In step S2, the number of lightning arresters is gradually increased from the preset initial value until the number reaches the upper limit, and the lightning arrester configuration scheme under different numbers of lightning arresters is designed according to the distances from the target phase conductors and the towers in the incoming line section to the substation.

[0081] The preset initial value can be 0, 1 or other values set according to experience. The upper limit of the number can be set according to the number of incoming line section towers contained in the substation. As a specific embodiment, the upper limit of the number can be set as the number of incoming line section towers contained in the substation, so that the arrester configuration scheme with the number of the upper limit can be obtained. For example, the incoming line section towers contained in the substation are g1, g2,..., gn (1 < n ≤ 10), and the upper limit of the number can be set as 10.

[0082] In an implementable manner, the arrester configuration scheme under different arrester installation numbers is designed according to the distances from the target phase conductor and each incoming line section tower in the substation to the substation, and includes:

[0083] According to the order from near to far of the distances from each incoming line section tower in the substation to the substation, an incoming line section tower corresponding to the current arrester installation number is selected as a target tower from each incoming line section tower in the substation;

[0084] One arrester is installed at the target phase conductor of each target tower to form an arrester scheme under the current arrester installation number.

[0085] For example, for the incoming line section towers g1, g2,..., gn (1 < n ≤ 10), g1 is closest to the substation, g2 is second closest, and gn is farthest from the substation. One line arrester is installed at the target phase conductor of the g1 tower to obtain the first arrester scheme. Then, one line arrester is installed at the target phase conductor of each of the g1 tower and the g2 tower (two in total) to obtain the second arrester scheme. Next, one line arrester is installed at the target phase conductor of each of the g1, g2 and g3 towers (three in total) to obtain the third arrester scheme. In this way, the arrester configuration schemes under different arrester installation numbers are obtained.

[0086] Further, when selecting the target tower, the incoming line section tower with a lower probability of being hit can be determined according to the lightning data in the region, the incoming line section tower with a lower probability of being hit is excluded, and the remaining incoming line section towers are selected as the target tower according to the order from near to far of the distances from the incoming line section towers to the substation.

[0087] In step S3, the breaker overvoltage level under each arrester configuration scheme is simulated and analyzed, the simulated breaker overvoltage level is compared with the rated lightning impulse withstand level of the breaker, and a corresponding comparison result is obtained.

[0088] The breaker overvoltage level under each arrester configuration scheme can be simulated and analyzed by an electromagnetic transient program.

[0089] Step S4, if there is a configuration scheme of the arrester whose breaker overvoltage level is lower than the rated lightning impulse withstand level of the breaker, determining the optimal configuration scheme of the arrester according to the comparison result.

[0090] The rated lightning impulse withstand level of the breaker, specifically the nominal rated lightning impulse withstand level of the breaker of different voltage grades, can be obtained by querying relevant standards.

[0091] In an implementable manner, the simulation analysis of the breaker overvoltage level under each configuration scheme of the arrester includes:

[0092] The simulation analysis of the breaker overvoltage level under each configuration scheme of the arrester is performed in order of the number of installed arresters from small to large;

[0093] The determination of the optimal configuration scheme of the arrester according to the comparison result includes:

[0094] When the configuration scheme of the arrester whose breaker overvoltage level is lower than the rated lightning impulse withstand level of the breaker is first found, the corresponding configuration scheme of the arrester is taken as the optimal configuration scheme of the arrester.

[0095] For example, for the above incoming line section tower g1, g2, …, gn (1 < n ≤ 10), the simulation analysis of the breaker overvoltage level under the first configuration scheme of the arrester is performed, and the simulated breaker overvoltage level is compared with the rated lightning impulse withstand level of the breaker. If the breaker overvoltage level is not lower than the rated lightning impulse withstand level of the breaker, the simulation analysis of the breaker overvoltage level under the second configuration scheme of the arrester is performed.

[0096] If the configuration scheme of the arrester whose breaker overvoltage level is lower than the rated lightning impulse withstand level of the breaker is found under the second configuration scheme of the arrester, the corresponding configuration scheme of the arrester is taken as the optimal configuration scheme of the arrester, and the simulation analysis of the remaining configuration schemes of the arrester will not be continued.

[0097] The embodiment can reduce the number of simulation analyses of the configuration schemes of the arrester, improve the efficiency of determining the optimal configuration scheme of the arrester, and ensure that the selected configuration scheme of the arrester meets the principle of optimal economic cost.

[0098] In another implementable manner, the determination of the optimal configuration scheme of the arrester according to the comparison result includes:

[0099] According to the comparison result corresponding to each configuration scheme of the arrester, the configuration scheme of the arrester whose breaker overvoltage level is lower than the rated lightning impulse withstand level of the breaker is classified into the first alternative scheme set;

[0100] Determine the arrester configuration scheme with the least number of installed arresters from the first alternative scheme set as the optimal arrester configuration scheme.

[0101] If the first alternative scheme set only contains one arrester configuration scheme, directly take the arrester configuration scheme as the optimal arrester configuration scheme.

[0102] In this embodiment, the arrester configuration scheme with the least number of installed arresters is determined from the first alternative scheme set as the optimal arrester configuration scheme, which can ensure that the selected arrester configuration scheme meets the principle of optimal economic cost.

[0103] Please refer to Figure 2 , Figure 2 A flow chart of an optimal configuration method of an arrester for circuit breaker insulation coordination is shown in another optional embodiment of the application. In addition to steps S1-S4 shown in the method of this embodiment, the following steps can also be included: Figure 1

[0104] Step S5: If there is no arrester configuration scheme with a circuit breaker overvoltage level lower than the rated lightning impulse withstand level of the circuit breaker, calculate the overvoltage level rise difference value corresponding to each arrester configuration scheme according to the following formula:

[0105] ΔU k-1 = U k-1 -U k

[0106] In the formula, ΔU k-1 represents the overvoltage level rise difference value corresponding to the arrester configuration scheme with the number of installed arresters being k-1, U k-1 represents the circuit breaker overvoltage level corresponding to the arrester configuration scheme with the number of installed arresters being k-1, and U k represents the circuit breaker overvoltage level corresponding to the arrester configuration scheme with the number of installed arresters being k.

[0107] Step S6: Classify the arrester configuration scheme with an overvoltage level rise difference value not less than a preset voltage threshold into a second alternative scheme set.

[0108] Step S7: Determine the arrester configuration scheme with the least number of installed arresters from the second alternative scheme set as the optimal arrester configuration scheme.

[0109] In this embodiment, the arrester configuration scheme does not meet the condition that the circuit breaker overvoltage level is lower than the rated lightning impulse withstand level of the circuit breaker. The specific value of the preset voltage threshold can be set according to actual conditions to ensure that the lightning protection effect of the optimal arrester configuration scheme selected subsequently is accurate.

[0110] ​Please refer to Figure 3 , Figure 3 A flow chart of an optimization configuration method of a circuit breaker insulation coordination arrester is shown in another optional embodiment of the present application. The method of the present embodiment can include the following steps in addition to steps S1-S7 shown in the above embodiment: Figure 2

[0111] Step S8: If there is no arrester configuration scheme in which the circuit breaker overvoltage level is lower than the rated lightning impulse withstand level of the circuit breaker, and there is no arrester configuration scheme in which the overvoltage level rising difference is not less than the preset voltage threshold, the arrester configuration scheme with the largest overvoltage level rising difference is taken as the optimal arrester configuration scheme.

[0112] Further, for the optimal arrester configuration scheme determined by step S8, the lightning protection effect corresponding to the scheme can be improved by adjusting the insulation coordination coefficient of the arrester therein. At present, the insulation coordination coefficient of the arrester is recommended to be 1.4 in the national standard GB / T50064-2014 "Design Specification for Overvoltage Protection and Insulation Coordination of AC Electrical Installations". As an implementable way, the maximum overvoltage level Um of the circuit breaker in the station can be obtained based on the lightning overvoltage simulation results, and considering a safety margin of 10%, the insulation coordination coefficient of the corresponding arrester is adjusted to 1.1Um / U0, U0 being the lightning impulse protection level of the arrester, and the value being taken as the residual voltage value under the nominal discharge current of the arrester.

[0113] Please refer to Figure 4 , Figure 4 A structure connection block diagram of an optimization configuration system of a circuit breaker insulation coordination arrester is shown in an optional embodiment of the present application.

[0114] Corresponding to the method embodiment shown in Figure 1 , an optimization configuration system of a circuit breaker insulation coordination arrester is further disclosed in the present embodiment, Figure 1 the optimization configuration method of the circuit breaker insulation coordination arrester in the embodiment shown in Figure 1 is implemented based on the system described in the present embodiment. The technical solutions of the two are consistent in nature, the explanations in the embodiment shown in

[0115] are also applicable to the present embodiment. Figure 4 As shown in , an optimization configuration system of a circuit breaker insulation coordination arrester provided by an embodiment of the present application comprises:

[0116] A target phase conductor determination module 1 is configured to obtain the maximum shielding lightning current of the three-phase tower conductor of the incoming line section in the station, and determine a target phase conductor for installing an arrester among the corresponding A-phase conductor, B-phase conductor and C-phase conductor according to the obtained maximum shielding lightning current.

[0117] The arrester configuration scheme design module 2 is configured to gradually increase the installation quantity of the arrester from a preset initial value until the installation quantity reaches an upper limit, and design the arrester configuration scheme under different installation quantities of the arrester according to the target phase conductor and the distance from each incoming line section tower to the substation.

[0118] The overvoltage level simulation comparison module 3 is configured to simulate and analyze the circuit breaker overvoltage level under each arrester configuration scheme, compare the simulated circuit breaker overvoltage level with the rated lightning impulse withstand level of the circuit breaker, and obtain a corresponding comparison result.

[0119] The first optimal scheme determination module 4 is configured to determine the optimal arrester configuration scheme according to the comparison result when there is an arrester configuration scheme in which the circuit breaker overvoltage level is lower than the rated lightning impulse withstand level of the circuit breaker.

[0120] In an implementable manner, the target phase conductor determination module 1 comprises:

[0121] A target phase conductor determination unit is configured to determine the maximum value in the maximum shielding failure lightning currents of the three-phase conductors of the incoming line section towers in the substation, and take the phase conductor corresponding to the maximum value as the target phase conductor of the corresponding incoming line section tower.

[0122] In an implementable manner, the arrester configuration scheme design module 2 comprises:

[0123] A tower selection unit is configured to select the incoming line section tower corresponding to the current arrester installation quantity as the target tower from each incoming line section tower in the substation according to the distance from the incoming line section tower to the substation in the order from near to far.

[0124] A scheme formation unit is configured to install one arrester at the target phase conductor of each target tower to form the arrester scheme under the current arrester installation quantity.

[0125] In an implementable manner, the overvoltage level simulation comparison module 3 comprises:

[0126] A simulation analysis unit is configured to simulate and analyze the circuit breaker overvoltage level under each arrester configuration scheme in the order from small to large arrester installation quantity.

[0127] The first optimal scheme determination module 4 comprises:

[0128] A first scheme determination unit is configured to take the corresponding arrester configuration scheme as the optimal arrester configuration scheme when the arrester configuration scheme in which the circuit breaker overvoltage level is lower than the rated lightning impulse withstand level of the circuit breaker is first found.

[0129] In one feasible implementation, the first optimal solution determination module 4 includes:

[0130] The scheme selection unit is used to include the surge arrester configuration schemes whose circuit breaker overvoltage level is lower than the circuit breaker's rated lightning impulse withstand level into the first alternative scheme set based on the comparison results of each surge arrester configuration scheme.

[0131] The second scheme determination unit is used to determine the surge arrester configuration scheme with the minimum number of surge arresters installed from the first set of alternative schemes as the optimal surge arrester configuration scheme.

[0132] Please see Figure 5 , Figure 5 The diagram shows a structural connection block diagram of an optimized configuration system for a surge arrester for circuit breaker insulation coordination, provided by another optional embodiment of the present invention.

[0133] correspond Figure 2 The method embodiment shown further discloses an optimized configuration system for surge arresters used in circuit breaker insulation coordination. Figure 2 The optimized configuration method for surge arresters used in circuit breaker insulation coordination described in the illustrated embodiment will be implemented based on the system described in this embodiment. The technical solutions of the two are essentially the same. Figure 2 The descriptions in the illustrated embodiments also apply to this embodiment.

[0134] like Figure 5 As shown, the embodiment of the present invention provides an optimized configuration system for surge arresters used in circuit breaker insulation coordination, which includes, in addition to, Figure 4 In addition to the target phase conductor determination module 1, surge arrester configuration scheme design module 2, overvoltage level simulation comparison module 3, and first optimal scheme determination module 4 shown, it also includes:

[0135] Calculation module 5 is used to calculate the overvoltage level rise difference for each surge arrester configuration scheme if there is no surge arrester configuration scheme where the circuit breaker overvoltage level is lower than the circuit breaker's rated lightning impulse withstand level, according to the following formula:

[0136] ΔU k-1 =U k-1 -U k

[0137] In the formula, ΔU k-1 U represents the overvoltage level rise difference corresponding to the surge arrester configuration scheme with a surge arrester installation quantity of k-1. k-1 For the surge arrester configuration scheme with a surge arrester installation quantity of k-1, the corresponding circuit breaker overvoltage level, U k The circuit breaker overvoltage level corresponding to the surge arrester configuration scheme with a surge arrester quantity of k.

[0138] The scheme selection module 6 is configured to classify the arrester configuration scheme with the overvoltage level rising difference value not less than the preset voltage threshold into the second candidate scheme set.

[0139] The second optimal scheme determination module 7 is configured to determine the arrester configuration scheme with the minimum number of arresters from the second candidate scheme set as the optimal arrester configuration scheme.

[0140] Referring to Figure 6 , Figure 6 An optional embodiment of the application provides a structural connection block diagram of an optimal configuration system of an arrester for insulating coordination of a circuit breaker.

[0141] Corresponding Figure 3 to the method embodiment shown, the embodiment further discloses an optimal configuration system of an arrester for insulating coordination of a circuit breaker, Figure 3 The optimal configuration method of the arrester for insulating coordination of a circuit breaker in the embodiment can be implemented based on the system in the embodiment. The technical solutions of the two are consistent in essence, Figure 3 The explanations in the embodiment are also applicable to the embodiment.

[0142] As Figure 6 shown, the embodiment of the application provides an optimal configuration system of an arrester for insulating coordination of a circuit breaker, which comprises, in addition to the target phase conductor determination module 1, the arrester configuration scheme design module 2, the overvoltage level simulation comparison module 3, the first optimal scheme determination module 4, the calculation module 5, the scheme selection module 6 and the second optimal scheme determination module 7 shown in the embodiment, Figure 5

[0143] The third optimal scheme determination module 8 is configured to, if there is no arrester configuration scheme with the overvoltage level lower than the rated lightning impulse withstand level of the circuit breaker, and there is no arrester configuration scheme with the overvoltage level rising difference value not less than the preset voltage threshold, determine the arrester configuration scheme with the maximum overvoltage level rising difference value as the optimal arrester configuration scheme.

[0144] The application further provides an optimal configuration device of an arrester for insulating coordination of a circuit breaker, comprising:

[0145] The memory is configured to store instructions; and the instructions are configured to implement the optimal configuration method of the arrester for insulating coordination of a circuit breaker according to any one of the above embodiments.

[0146] The processor is configured to execute the instructions in the memory.

[0147] ​The application further provides a computer readable storage medium, wherein the computer readable storage medium stores a computer program, and the computer program is executed by a processor to implement the optimization configuration method of the arrester for insulating coordination of the circuit breaker according to any one of the above embodiments.

[0148] According to the above embodiments of the application, the target phase conductor for installing the arrester is determined according to the maximum shielding lightning current, the installation position of the arrester is optimized, the optimal arrester configuration scheme is determined based on the simulation data of the circuit breaker overvoltage level under different arrester configuration schemes, and the installation number of the arrester is optimized, so that the technical problem of optimizing the configuration of the arrester for insulating coordination of the circuit breaker considering the lightning protection effect and economic factors is solved.

[0149] In several embodiments provided in the present application, it should be understood that the disclosed system, device and method can be implemented in other manners. For example, the above described device embodiments are merely schematic, and the division of the modules is merely a logical function division, and there can be another division manner in actual implementation, for example, a plurality of modules or components can be combined or integrated into another system, or some features can be ignored or not executed. In addition, the displayed or discussed coupling or direct coupling or communication connection between modules can be indirect coupling or communication connection through some interfaces, devices or modules, and can be electrical, mechanical or other forms.

[0150] The modules illustrated as separated components can or can not be physically separated, and the components illustrated as modules can or can not be physical modules, that is, can be located in one place, or can be distributed on a plurality of network modules. According to actual needs, some or all of the modules can be selected to achieve the purpose of the embodiment scheme.

[0151] In addition, each functional module in each embodiment of the application can be integrated in one processing module, or each module can be physically present alone, or two or more modules can be integrated in one module. The integrated module can be realized in the form of hardware or in the form of a software functional module.

[0152] The integrated module, if implemented in the form of a software function module and sold or used as an independent product, can be stored in a computer readable storage medium. Based on such understanding, the technical solutions of the present application essentially or the part that contributes to the prior art, or all or part of the technical solutions can be embodied in the form of a software product. The computer software product is stored in a storage medium, and includes several instructions to make a computer device (which can be a personal computer, a server, or a network device, etc.) execute all or part of the steps of the methods described in the various embodiments of the present application. The aforementioned storage medium includes: a U disk, a mobile hard disk, a read-only memory (ROM, Read-Only Memory), a random access memory (RAM, Random Access Memory), a magnetic disk or an optical disk, and various media that can store program codes.

[0153] The above-described embodiments are only used to illustrate the technical solutions of the present application, rather than limit them; although the present application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that they can still modify the technical solutions recorded in the foregoing embodiments, or make equivalent replacements for some technical features; and these modifications or replacements do not make the corresponding technical solutions deviate from the spirit and scope of the technical solutions of the embodiments of the present application.

Claims

1. A method of optimizing configuration of a lightning arrester for insulation coordination of a circuit breaker, characterized by, The method comprises the following steps: obtaining the maximum shielding lightning current of the three-phase conductor of the tower of the incoming line section in the station, and determining the target phase conductor for installing the lightning arrester according to the obtained maximum shielding lightning current in the corresponding A-phase conductor, B-phase conductor and C-phase conductor; gradually increasing the installation quantity of the lightning arrester from the preset initial value until the installation quantity reaches the upper limit, and designing the lightning arrester configuration scheme under different installation quantities of the lightning arrester according to the target phase conductor and the distance from each tower of the incoming line section in the station to the substation; performing simulation analysis on the circuit breaker overvoltage level under each lightning arrester configuration scheme, comparing the simulation obtained circuit breaker overvoltage level with the rated lightning impulse withstand level of the circuit breaker, and obtaining the corresponding comparison result; if there is a lightning arrester configuration scheme in which the circuit breaker overvoltage level is lower than the rated lightning impulse withstand level of the circuit breaker, determining the optimal lightning arrester configuration scheme according to the comparison result; The method further comprises the following steps: if there is no lightning arrester configuration scheme in which the circuit breaker overvoltage level is lower than the rated lightning impulse withstand level of the circuit breaker, calculating the overvoltage level rising difference value corresponding to each lightning arrester configuration scheme according to the following formula: ； In the formula, The overvoltage level difference of the lightning arrester configuration scheme corresponding to the lightning arrester installation number The circuit breaker overvoltage level of the lightning arrester configuration scheme corresponding to the lightning arrester installation number The circuit breaker overvoltage level of the lightning arrester configuration scheme corresponding to the lightning arrester installation number The circuit breaker overvoltage level of the lightning arrester configuration scheme corresponding to the lightning arrester installation number The circuit breaker overvoltage level of the lightning arrester configuration scheme corresponding to the lightning arrester installation number​ putting the lightning arrester configuration scheme with the overvoltage level rising difference value not less than the preset voltage threshold into the second alternative scheme set; determining the lightning arrester configuration scheme with the minimum installation quantity of the lightning arrester from the second alternative scheme set as the optimal lightning arrester configuration scheme.

2. The method of optimal configuration of a surge arrester for insulation coordination of a circuit breaker according to claim 1, characterized in that, The method further comprises the following steps: determining the maximum value in the maximum shielding lightning current of the three-phase conductor of the tower of the incoming line section in the station, and taking the phase conductor corresponding to the maximum value in the maximum shielding lightning current as the target phase conductor of the corresponding tower of the incoming line section.

3. The method of optimal configuration of a surge arrester for insulation coordination of a circuit breaker according to claim 1, characterized in that, The method further comprises the following steps: selecting the tower of the incoming line section in the station corresponding to the current installation quantity of the lightning arrester as the target tower according to the order from near to far of the distance from the tower of the incoming line section in the station to the substation; installing one lightning arrester at the target phase conductor of each target tower to form the lightning arrester scheme under the current installation quantity of the lightning arrester.

4. The method of optimal configuration of a surge arrester for insulation coordination of a circuit breaker according to claim 3, characterized in that, The method further comprises the following steps: performing simulation analysis on the circuit breaker overvoltage level under each lightning arrester configuration scheme in the order from small to large of the installation quantity of the lightning arrester; The method further comprises the following steps: when the lightning arrester configuration scheme in which the circuit breaker overvoltage level is lower than the rated lightning impulse withstand level of the circuit breaker is found for the first time, taking the corresponding lightning arrester configuration scheme as the optimal lightning arrester configuration scheme.

5. The method of optimal configuration of a surge arrester for insulation coordination of a circuit breaker according to claim 3, characterized in that, The method further comprises the following steps: putting the lightning arrester configuration scheme in which the circuit breaker overvoltage level is lower than the rated lightning impulse withstand level of the circuit breaker into the first alternative scheme set according to the comparison result corresponding to each lightning arrester configuration scheme; determining the lightning arrester configuration scheme with the minimum installation quantity of the lightning arrester from the first alternative scheme set as the optimal lightning arrester configuration scheme.

6. The method of optimal configuration of a surge arrester for insulation coordination of a circuit breaker according to claim 1, characterized in that, The method further comprises the following steps: If there is no arrester configuration scheme in which the overvoltage level of the circuit breaker is lower than the rated lightning impulse withstand level of the circuit breaker, and no arrester configuration scheme in which the overvoltage level rising difference is not less than the preset voltage threshold, the arrester configuration scheme with the largest overvoltage level rising difference is taken as the optimal arrester configuration scheme.

7. An optimal configuration system of a lightning arrester for insulation coordination of a circuit breaker, characterized by, The method comprises the steps of: a target phase conductor determination module is configured to obtain the maximum shielding failure lightning current of the three-phase conductor of a tower of an incoming line section in a station, and determine a target phase conductor for installing an arrester from among the A-phase conductor, the B-phase conductor and the C-phase conductor according to the obtained maximum shielding failure lightning current; an arrester configuration scheme design module is configured to gradually increase the number of installed arresters from a preset initial value until the number of installed arresters reaches an upper limit, and design arrester configuration schemes under different numbers of installed arresters according to the target phase conductor and distances from towers of incoming line sections in the station to the substation; an overvoltage level simulation and comparison module is configured to simulate and analyze the overvoltage level of the circuit breaker under each arrester configuration scheme, compare the simulated overvoltage level of the circuit breaker with the rated lightning impulse withstand level of the circuit breaker, and obtain a corresponding comparison result; a first optimal scheme determination module is configured to determine an optimal arrester configuration scheme according to the comparison result if there is an arrester configuration scheme in which the overvoltage level of the circuit breaker is lower than the rated lightning impulse withstand level of the circuit breaker; The system further comprises: a calculation module is configured to calculate the overvoltage level rising difference corresponding to each arrester configuration scheme according to the following formula if there is no arrester configuration scheme in which the overvoltage level of the circuit breaker is lower than the rated lightning impulse withstand level of the circuit breaker: ； In the formula, The overvoltage level difference of the lightning arrester configuration scheme corresponding to the lightning arrester installation number The overvoltage level of the lightning arrester configuration scheme corresponding to the lightning arrester installation number The overvoltage level of the lightning arrester configuration scheme corresponding to the lightning arrester installation number The overvoltage level of the lightning arrester configuration scheme corresponding to the lightning arrester installation number The overvoltage level of the lightning arrester configuration scheme corresponding to the lightning arrester installation number​ a scheme selection module is configured to classify arrester configuration schemes in which the overvoltage level rising difference is not less than the preset voltage threshold into a second candidate scheme set; a second optimal scheme determination module is configured to determine an arrester configuration scheme with the smallest number of installed arresters as the optimal arrester configuration scheme from the second candidate scheme set.

8. An apparatus for optimizing configuration of a surge arrester for insulation coordination of a circuit breaker, characterized by, The method comprises the steps of: a memory is configured to store instructions; wherein the instructions are used to implement the optimal configuration method of the arrester for insulation coordination of the circuit breaker according to any one of claims 1-6; a processor is configured to execute the instructions in the memory.

9. A computer-readable storage medium, characterized in that, The computer program is stored on the computer readable storage medium and is executed by the processor to implement the optimal configuration method of the arrester for insulation coordination of the circuit breaker according to any one of claims 1-6.

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