CN112487710A - Power distribution network protection configuration optimization method and system - Google Patents
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Abstract
The invention discloses a power distribution network protection configuration optimization method and system, belonging to the technical field of power system relay protection and comprising the following steps: according to a real-time operation mode, the opening and closing states of all circuit breakers of the outgoing line unit and the protection configuration of all the circuit breakers are obtained, and an initial group of the outgoing line unit is randomly generated based on the power flow distribution; calculating a fitness function of each group and recording an optimal chromosome; selecting individuals for crossing and mutation to form a new generation of population; calculating a fitness function of the new population and recording the final individual; and judging whether the maximum iteration number is reached, if so, ending the circulation and outputting the optimal individual, otherwise, carrying out cross variation operation again. The method and the system combine the real-time trend to identify the main line and the branch line, improve the reliability of the setting fixed value of the power distribution network, reduce the power failure range of the power distribution network, and ensure the safe and reliable operation of the power distribution network.
Description
Technical Field
The invention relates to the technical field of power system relay protection, in particular to a power distribution network protection configuration optimization method and system.
Background
The power distribution network is used as the last link of the power transmission and distribution system and closely contacts terminal power utilization users, the safe and stable operation of the power distribution network is the guarantee of high quality and high reliable power utilization of the users, and therefore the relay protection of the power distribution network is very important as the first defense line of the safe operation of the power distribution network. The power distribution network switches are divided into four types, namely an outgoing line switch, a main line section switch, a branch switch and a user boundary switch. The configuration of the overhead distribution line protection in China is generally divided into two-stage protection and three-stage protection according to the actual setting condition, and because the grid structure of the power distribution network is complex, the number of T connection lines is large, the change is frequent, the fixed values on switches at all stages during actual setting are not accurate enough, and the matching between different stages is mainly realized by time stage difference. Taking a distribution network in a certain place as an example, three-level protection is mainly adopted, namely zero-level protection, first-level protection and second-level protection, each level adopts three-stage overcurrent protection, and the I-stage time limit of each level of protection in actual setting is 0 s; the time limit obtained by matching the II-stage time limit of the zero-level protection with the backup protection of the superior transformer is generally 0.6s, and the II-stage time limits of the primary protection and the secondary protection obtained by adopting a 0.2s time difference mechanism are respectively 0.4s and 0.2 s; the time limit obtained by matching the III section time limit of the zero-level protection with the backup protection of the upper-level transformer is generally 1.0s, and the III section time limit of the first-level protection and the III section time limit of the second-level protection are respectively 0.8s and 0.6s by adopting a 0.2s time level difference mechanism.
Because no unified standard exists, the protection configuration in the actual setting is manually realized, the configuration is unreasonable, and the set fixed value and time fixed value of each level of protection cannot completely meet the requirements of an actual power grid, so that the capability of guaranteeing the power utilization reliability is greatly influenced. The positions and the fixed values of all levels of protection are reasonably configured, when a power distribution network line fails, the orderly tripping of all protection switches can be realized, the power failure range is reduced, the power supply reliability of the power distribution network can be improved, and therefore, the optimization of the protection configuration of the power distribution network line protection becomes a key research point.
Disclosure of Invention
The invention aims to overcome the defects in the background technology so as to improve the reliability of the setting fixed value of the power distribution network.
In order to achieve the above object, on one hand, a power distribution network protection configuration optimization method is adopted, which includes the following steps:
s1, acquiring the opening and closing state of each breaker of the outlet unit and the protection configuration of each breaker;
s2, randomly generating an initial population of the outgoing line units according to the opening and closing state and protection configuration of each circuit breaker and based on real-time power flow distribution;
s3, calculating a fitness function of the initial population and recording the optimal individual;
s4, selecting individuals according to the fitness of the individuals in the problem domain to carry out combination crossing and variation to obtain a new generation of population;
s5, calculating a fitness function of the new generation of population and recording the optimal individuals;
s6, judging whether the target iteration number is reached, if so, executing a step S7, and if not, executing a step S4;
and S7, ending the loop and outputting the optimal individual.
Further, the randomly generating an initial population of the outgoing line units according to the opening and closing states and the protection configuration of each circuit breaker and based on real-time power flow distribution includes:
determining a main line and a branch line of the power distribution network based on the real-time power flow;
determining a protection configuration code of a trunk line and a protection configuration code of a branch line according to the opening and closing state and the protection configuration of each circuit breaker by adopting binary codes;
and combining the protection configuration codes of the trunk line and the branch line to obtain the coding individuals of the outgoing line unit, and forming the initial population of the outgoing line unit.
Further, the determining the main line and the branch line of the power distribution network based on the real-time power flow comprises the following steps:
starting from the outgoing switch, searching all loads along the direction of each branch tide after T connection, and taking the load sum as a main line;
and after all the main lines of the outgoing line units are found out, the rest main lines are used as branch lines.
Further, the determining, by using binary coding, the protection configuration code of the trunk line and the protection configuration code of the branch line according to the switching state and the protection configuration of each circuit breaker includes:
carrying out grading operation on the circuit breakers which are in a closed state and are configured with protection in the main line and the branch line;
and coding the primary switch into 0 and coding the secondary switch into 1 to respectively obtain the protection configuration code of the main line and the protection configuration code of the branch line.
Further, the fitness function of the initial population is the inverse of an objective function, and the objective function is: min and C, wherein C is the annual power failure loss cost of the power system, and C is (a)1K+a2bd)WENSK is the power generation ratio, a1Weighting coefficients for the power generation ratio, a2Is a weighted coefficient of average electricity price conversion multiple method, b is the ratio of unit power failure electricity price to average electricity price, d is average electricity price, W isENSAnticipating a power shortage for the power system;
the constraint conditions are as follows:
wherein:
r is a system reliability index under a certain protection switch configuration mode;
R0reliability index required for planning;
Viis the ith node voltage;
Vimaxthe maximum voltage allowed for node i;
Viminthe minimum voltage allowed for node i;
Iiis the ith branch current;
Iimaxthe maximum current allowed for the ith branch;
Fmaxthe average maximum annual fault rate of the line.
Further, before acquiring the open/close state of each breaker of the outlet unit and the protection configuration of each breaker, the method further includes:
scanning the operation mode file, comparing the operation mode file obtained by scanning with the switch opening and closing state of the outlet unit under the current operation mode file, and judging whether the operation mode file changes;
if yes, execute the step S2;
if not, the loop is ended.
On the other hand, a power distribution network protection configuration optimization system is adopted, and the system comprises an acquisition module, an initial population forming module, a first calculation module, a cross mutation operation module, a second calculation module, a judgment module and an output module, wherein:
the acquisition module is used for acquiring the opening and closing states of all circuit breakers of the outgoing line unit and the protection configuration of all circuit breakers;
the initial population forming module is used for randomly generating an initial population of the outgoing line unit according to the opening and closing state and protection configuration of each circuit breaker and based on real-time tide distribution;
the first calculation module is used for calculating a fitness function of the initial population and recording the optimal individual;
the cross variation operation module is used for selecting individuals according to the fitness of the individuals in the problem domain to carry out combined cross and variation to obtain a new generation of population;
the second calculation module is used for calculating the fitness function of the new generation of population and recording the optimal individual;
the judging module is used for judging whether the set iteration times are reached;
the output module is used for ending circulation and outputting the optimal individual when the output result of the judging module is yes;
and the second calculation module is used for re-executing the steps when the output result of the judgment module is negative.
Further, the initial population forming module comprises a determining unit, a coding unit and a combining unit, wherein:
the determining unit is used for determining a main line and branch lines of the power distribution network based on the real-time power flow;
the coding unit is used for determining a protection configuration code of a trunk line and a protection configuration code of a branch line according to the opening and closing state and the protection configuration of each circuit breaker by adopting binary coding;
the combination unit is used for combining the protection configuration codes of the trunk line and the branch line to obtain the coding individuals of the outgoing line unit, and an initial population of the outgoing line unit is formed.
Further, the determining unit is specifically configured to:
starting from the outgoing switch, searching all loads along the direction of each branch tide after T connection, and taking the load sum as a main line;
and after all the main lines of the outgoing line units are found out, the rest main lines are used as branch lines.
Further, the encoding unit is specifically configured to:
carrying out grading operation on the circuit breakers which are in a closed state and are configured with protection in the main line and the branch line;
and coding the primary switch into 0 and coding the secondary switch into 1 to respectively obtain the protection configuration code of the main line and the protection configuration code of the branch line.
Further, the fitness function of the initial population is the inverse of an objective function, and the objective function is: min and C, wherein C is the annual power failure loss cost of the power system, and C is (a)1K+a2bd)WENSK is the power generation ratio, a1Weighting coefficients for the power generation ratio, a2Is a weighted coefficient of average electricity price conversion multiple method, b is the ratio of unit power failure electricity price to average electricity price, d is average electricity price, W isENSAnticipating a power shortage for the power system;
the constraint conditions are as follows:
wherein:
r is a system reliability index under a certain protection switch configuration mode;
R0reliability index required for planning;
Viis the ith node voltage;
Vimaxthe maximum voltage allowed for node i;
Viminthe minimum voltage allowed for node i;
Iiis the ith branch current;
Iimaxthe maximum current allowed for the ith branch;
Fmaxthe average maximum annual fault rate of the line.
Compared with the prior art, the invention has the following technical effects: the grading protection switch technology based on the improved genetic algorithm solves the problem that a setting fixed value cannot adapt to actual trend caused by manual work without a unified grading protection switch; and the identification of the main line and the branch line is carried out by combining with the real-time tide, so that the reliability of the setting fixed value of the power distribution network is improved, the power failure range of the power distribution network is reduced, and the safe and reliable operation of the power distribution network is ensured.
Drawings
The following detailed description of embodiments of the invention refers to the accompanying drawings in which:
FIG. 1 is a flow chart of a method for optimizing protection configuration of a power distribution network;
FIG. 2 is a flow chart of another method for optimizing protection configurations for a power distribution network;
FIG. 3 is a schematic diagram of the optimization results of the protection configuration of the distribution network;
fig. 4 is a block diagram of a power distribution network protection configuration optimization system.
Detailed Description
To further illustrate the features of the present invention, refer to the following detailed description of the invention and the accompanying drawings. The drawings are for reference and illustration purposes only and are not intended to limit the scope of the present disclosure.
As shown in fig. 1, the present embodiment discloses a power distribution network protection configuration optimization method, which includes the following steps:
s1, acquiring the opening and closing state of each breaker of the outlet unit and the protection configuration of each breaker;
s2, randomly generating an initial population of the outgoing line units according to the opening and closing state and protection configuration of each circuit breaker and based on real-time power flow distribution;
s3, calculating a fitness function of the initial population and recording the optimal individual;
s4, selecting individuals according to the fitness of the individuals in the problem domain to carry out combination crossing and variation to obtain a new generation of population;
s5, calculating a fitness function of the new generation of population and recording the optimal individuals;
s6, judging whether the target iteration number is reached, if so, executing a step S7, and if not, executing a step S4;
and S7, ending the loop and outputting the optimal individual.
It should be noted that the initial population number of the randomly generated outlet units in this embodiment includes, but is not limited to, 600, the target iteration number in this embodiment is a number corresponding to the minimum value of the objective function, and the reciprocal of the objective function is the fitness function.
More preferably, in step S2: according to the opening and closing state and the protection configuration of each circuit breaker and based on real-time power flow distribution, an initial population of the outgoing line units is randomly generated, and the method comprises the following subdivision steps:
determining a main line and a branch line of the power distribution network based on the real-time power flow;
determining a protection configuration code of a trunk line and a protection configuration code of a branch line according to the opening and closing state and the protection configuration of each circuit breaker by adopting binary codes;
and combining the protection configuration codes of the trunk line and the branch line to obtain the coding individuals of the outgoing line unit, and forming the initial population of the outgoing line unit.
As a further preferable scheme, the determining the trunk line and the branch line of the power distribution network based on the real-time power flow includes:
starting from the outgoing switch, searching all loads along the direction of each branch tide after T connection, and taking the load sum as a main line;
and after all the main lines of the outgoing line units are found out, the rest main lines are used as branch lines.
It should be noted that the initial population is generated by using a random function, and since the distribution network has many branches, the trunk line needs to be determined first, and here, the trunk line is determined by using real-time power flow, so as to obtain the trunk line of the outgoing line unit, and the rest are branch lines. The embodiment fully combines real-time power flow to identify the main line and the branch line, greatly improves the reliability of the setting fixed value of the power distribution network, reduces the power failure range of the power distribution network, and ensures the safe and reliable operation of the power distribution network.
As a further preferable scheme, the determining, by using a binary code, a protection configuration code of a trunk line and a protection configuration code of a branch line according to an opening/closing state and a protection configuration of each circuit breaker includes:
carrying out grading operation on the circuit breakers which are in a closed state and are configured with protection in the main line and the branch line;
and coding the primary switch into 0 and coding the secondary switch into 1 to respectively obtain the protection configuration code of the main line and the protection configuration code of the branch line.
It should be noted that, in the present application, a specific process of performing a grading operation on a circuit breaker is as follows: and when the target function is minimum, the corresponding protection configuration switch stage number is the stage number of the circuit breaker in the outgoing line unit, and the stage operation is completed.
It should be noted that, in this embodiment, binary coding is adopted, and because there are many circuit breakers configured for the outgoing line unit of the power distribution network, coding is complex and affects convergence effect, in this embodiment, only grading operation is performed on switches that are closed and configured with protection in the outgoing line unit, if the switches are primary switches, the coding is 0, and the coding of the secondary switches is 1, so as to obtain a protection configuration coding of the trunk line and a protection configuration coding of the branch line respectively, and obtain a total coding of the outgoing line unit as a chromosome through combination.
As a further preferred scheme, the fitness function of the initial population is the inverse of an objective function, and the objective function is: min and C, wherein C is the annual power failure loss cost of the power system, and C is (a)1K+a2bd)WENSK is the power generation ratio, a1Weighting coefficients for the power generation ratio, a2Is a weighted coefficient of average electricity price conversion multiple method, b is the ratio of unit power failure electricity price to average electricity price, d is average electricity price, W isENSAnticipating a power shortage for the power system;
the constraint conditions are as follows:
wherein:
r is a system reliability index under a certain protection switch configuration mode;
R0reliability index required for planning;
Viis the ith node voltage;
Vimaxthe maximum voltage allowed for node i;
Viminthe minimum voltage allowed for node i;
Iiis the ith branch current;
Iimaxthe maximum current allowed for the ith branch;
Fmaxthe average maximum annual fault rate of the line.
It should be noted that the configuration problem of the protection switch of the power distribution network, that is, the configuration protection problem of the circuit breaker, belongs to a nonlinear and discrete multi-objective combination optimization problem, the power distribution network is used as the end of the power network, the safe and stable operation of the power distribution network directly affects the requirements of users in the aspects of power quality, power supply reliability and the like, and the loss caused by the power failure of the users is less and represents that the power supply reliability of the power distribution network is higher, so the power failure loss is minimum as a target function.
As a more preferable mode, as shown in fig. 2, in the step S1: before the protection configuration of the open and shut state and each circuit breaker of acquireing each circuit breaker of the unit of being qualified for the next round of competitions, still include:
scanning the operation mode file, comparing the operation mode file obtained by scanning with the switch opening and closing state of the outlet unit under the current operation mode file, and judging whether the operation mode file changes;
if yes, execute the step S2;
if not, ending the circulation, namely if the scanned running file is consistent with the current file, determining that the circuit breaker grades of the outgoing line unit are consistent. .
The method for automatically identifying the operation mode of the power distribution network switch, the technology for automatically identifying the matching point of the power distribution network based on the real-time power flow and the intelligent optimization algorithm, and the automatic matching protection constant value scheme are adopted to realize the intelligent setting of the constant value of the power distribution network, so that the verification of the existing operation constant value is realized, an auxiliary decision is provided for the switching of the constant value area of the power distribution network, the adaptability of the constant value under the change of the real-time check power flow and the change of the operation mode can be realized, and the selection rule results of the zero-level, primary and secondary switches in the branch line form obtained by the method are shown in fig.
It should be noted that, in the present embodiment, the matching points are defined as good-quality, first-level, and second-level matching points; the good grade matching point is a 10- (20) kilovolt outgoing switch of a transformer substation, and the first-grade and second-grade matching points can be a ring main unit, an opening and closing station on a 10- (20) kilovolt distribution line or an intelligent circuit breaker with a microcomputer protection function and a fixed value free setting function.
As shown in fig. 4, the present embodiment discloses a power distribution network protection configuration optimization system, which includes an obtaining module 10, an initial population forming module 20, a first calculating module 30, a cross mutation operating module 40, a second calculating module 50, a determining module 60, and an output module 70, wherein:
the obtaining module 10 is used for obtaining the opening and closing states of the circuit breakers of the outgoing line unit and the protection configuration of the circuit breakers;
the initial population forming module 20 is used for randomly generating an initial population of the outgoing line unit according to the opening and closing state and protection configuration of each circuit breaker and based on real-time power flow distribution;
the first calculating module 30 is used for calculating a fitness function of the initial population and recording the optimal individual;
the cross variation operation module 40 is used for selecting individuals according to the fitness of the individuals in the problem domain to perform combined cross and variation to obtain a new generation of population;
the second calculating module 50 is used for calculating a fitness function of the new generation population and recording the optimal individual;
the judging module 60 is configured to judge whether a set iteration number is reached;
the output module 70 is used for ending the cycle and outputting the optimal individual when the output result of the judging module 60 is yes;
the second calculating module 70 is used for re-executing the steps when the output result of the judging module 60 is negative.
As a further preferred scheme, the initial population forming module 20 includes a determining unit, an encoding unit and a combining unit, wherein:
the determining unit is used for determining a main line and branch lines of the power distribution network based on the real-time power flow;
the coding unit is used for determining a protection configuration code of a trunk line and a protection configuration code of a branch line according to the opening and closing state and the protection configuration of each circuit breaker by adopting binary coding;
the combination unit is used for combining the protection configuration codes of the trunk line and the branch line to obtain the coding individuals of the outgoing line unit, and an initial population of the outgoing line unit is formed.
As a further preferred scheme, the determining unit is specifically configured to:
starting from the outgoing switch, searching all loads along the direction of each branch tide after T connection, and taking the load sum as a main line;
and after all the main lines of the outgoing line units are found out, the rest main lines are used as branch lines.
As a further preferred aspect, the encoding unit is specifically configured to:
carrying out grading operation on the circuit breakers which are in a closed state and are configured with protection in the main line and the branch line;
and coding the primary switch into 0 and coding the secondary switch into 1 to respectively obtain the protection configuration code of the main line and the protection configuration code of the branch line.
As a further preferred scheme, the fitness function of the initial population is the inverse of an objective function, and the objective function is: min and C, wherein C is the annual power failure loss cost of the power system, and C is (a)1K+a2bd)WENSK is the power generation ratio, a1Weighting coefficients for the power generation ratio, a2Is a weighted coefficient of average electricity price conversion multiple method, b is the ratio of unit power failure electricity price to average electricity price, d is average electricity price, W isENSAnticipating a power shortage for the power system;
the constraint conditions are as follows:
wherein:
r is a system reliability index under a certain protection switch configuration mode;
R0reliability index required for planning;
Viis the ith node voltage;
Vimaxthe maximum voltage allowed for node i;
Viminthe minimum voltage allowed for node i;
Iiis the ith branch current;
Iimaxthe maximum current allowed for the ith branch;
Fmaxthe average maximum annual fault rate of the line.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents, improvements and the like that fall within the spirit and principle of the present invention are intended to be included therein.
Claims (10)
1. A power distribution network protection configuration optimization method is characterized by comprising the following steps:
s1, acquiring the opening and closing state of each breaker of the outlet unit and the protection configuration of each breaker;
s2, randomly generating an initial population of the outgoing line units according to the opening and closing state and protection configuration of each circuit breaker and based on real-time power flow distribution;
s3, calculating a fitness function of the initial population and recording the optimal individual;
s4, selecting individuals according to the fitness of the individuals in the problem domain to carry out combination crossing and variation to obtain a new generation of population;
s5, calculating a fitness function of the new generation of population and recording the optimal individuals;
s6, judging whether the target iteration number is reached, if so, executing a step S7, and if not, executing a step S4;
and S7, ending the loop and outputting the optimal individual.
2. The power distribution network protection configuration optimization method according to claim 1, wherein the randomly generating an initial population of outlet units according to the switching states and protection configurations of the circuit breakers and based on real-time power flow distribution comprises:
determining a main line and a branch line of the power distribution network based on the real-time power flow;
determining a protection configuration code of a trunk line and a protection configuration code of a branch line according to the opening and closing state and the protection configuration of each circuit breaker by adopting binary codes;
and combining the protection configuration codes of the trunk line and the branch line to obtain the coding individuals of the outgoing line unit, and forming the initial population of the outgoing line unit.
3. The power distribution network protection configuration optimization method of claim 2, wherein the determining the trunk lines and branch lines of the power distribution network based on the real-time power flow comprises:
starting from the outgoing switch, searching all loads along the direction of each branch tide after T connection, and taking the load sum as a main line;
and after all the main lines of the outgoing line units are found out, the rest main lines are used as branch lines.
4. The method for optimizing the protection configuration of the power distribution network according to claim 2, wherein the determining, by using the binary code, the protection configuration code of the trunk line and the protection configuration code of the branch line according to the switching state and the protection configuration of each circuit breaker comprises:
carrying out grading operation on the circuit breakers which are in a closed state and are configured with protection in the main line and the branch line;
and coding the primary switch into 0 and coding the secondary switch into 1 to respectively obtain the protection configuration code of the main line and the protection configuration code of the branch line.
5. The power distribution network protection configuration optimization method according to claim 1, wherein the fitness function of the initial population is an inverse of an objective function, and the objective function is: min and C, wherein C is the annual power failure loss cost of the power system, and C is (a)1K+a2bd)WENSK is the power generation ratio, a1Weighting coefficients for the power generation ratio, a2Is a weighted coefficient of average electricity price conversion multiple method, b is the ratio of unit power failure electricity price to average electricity price, d is average electricity price, W isENSAnticipating a power shortage for the power system;
the constraint conditions are as follows:
wherein:
r is a system reliability index under a certain protection switch configuration mode;
R0reliability index required for planning;
Viis the ith node voltage;
Vimaxthe maximum voltage allowed for node i;
Viminthe minimum voltage allowed for node i;
Iiis the ith branch current;
Iimaxthe maximum current allowed for the ith branch;
Fmaxthe average maximum annual fault rate of the line.
6. The power distribution network protection configuration optimization method according to any one of claims 1 to 5, wherein before the obtaining of the on-off state of each breaker of the outlet unit and the protection configuration of each breaker, the method further comprises:
scanning the operation mode file, comparing the operation mode file obtained by scanning with the switch opening and closing state of the outlet unit under the current operation mode file, and judging whether the operation mode file changes;
if yes, execute the step S2;
if not, the loop is ended.
7. The utility model provides a distribution network protection configuration optimization system, its characterized in that includes acquisition module, initial population form module, first calculation module, cross variation operation module, second calculation module, judgement module and output module, wherein:
the acquisition module is used for acquiring the opening and closing states of all circuit breakers of the outgoing line unit and the protection configuration of all circuit breakers;
the initial population forming module is used for randomly generating an initial population of the outgoing line unit according to the opening and closing state and protection configuration of each circuit breaker and based on real-time tide distribution;
the first calculation module is used for calculating a fitness function of the initial population and recording the optimal individual;
the cross variation operation module is used for selecting individuals according to the fitness of the individuals in the problem domain to carry out combined cross and variation to obtain a new generation of population;
the second calculation module is used for calculating the fitness function of the new generation of population and recording the optimal individual;
the judging module is used for judging whether the set iteration times are reached;
the output module is used for ending circulation and outputting the optimal individual when the output result of the judging module is yes;
and the second calculation module is used for re-executing when the output result of the judgment module is negative.
8. The power distribution network protection configuration optimization system of claim 7, wherein the initial population forming module comprises a determining unit, an encoding unit, and a combining unit, wherein:
the determining unit is used for determining a main line and branch lines of the power distribution network based on the real-time power flow;
the coding unit is used for determining a protection configuration code of a trunk line and a protection configuration code of a branch line according to the opening and closing state and the protection configuration of each circuit breaker by adopting binary coding;
the combination unit is used for combining the protection configuration codes of the trunk line and the branch line to obtain the coding individuals of the outgoing line unit, and an initial population of the outgoing line unit is formed.
9. The system according to claim 8, wherein the determining unit is specifically configured to:
starting from the outgoing switch, searching all loads along the direction of each branch tide after T connection, and taking the load sum as a main line;
and after all the main lines of the outgoing line units are found out, the rest main lines are used as branch lines.
10. The system according to claim 8, wherein the encoding unit is specifically configured to:
carrying out grading operation on the circuit breakers which are in a closed state and are configured with protection in the main line and the branch line;
and coding the primary switch into 0 and coding the secondary switch into 1 to respectively obtain the protection configuration code of the main line and the protection configuration code of the branch line.
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