Electrical protection selective region analysis method, device, equipment and medium

Abstract

The invention provides an electrical protection selective region analysis method, device, equipment and medium, and the analysis method comprises the steps: respectively applying a downstream definite time-lag protection constant value current, an upstream definite time-lag protection constant value current and a three-phase short-circuit current to a bus, calculating the corresponding protection action time and the intersection point of the first inverse time limit over-current protection action function and the second inverse time limit over-current protection action function; judging whether the first area, the second area and the third area have selectivity or not; and when any one of the first region, the second region and the third region does not have selectivity, adjusting parameters of the first inverse-time-limit overcurrent protection action function and / or the second inverse-time-limit overcurrent protection action function, and repeatedly judging until the first region, the second region and the third region have selectivity at the same time. According to the analysis method, device and equipment for the electrical protection selective area and the medium provided by the invention, the selectivity of the whole system can be comprehensively verified.

Description

Technical Field

[0001] The invention relates to the field of nuclear power, and in particular to an analysis method, device, equipment and medium for an electrical protection selective area. Background Art

[0002] In modern power systems, selective protection means that the protection device can accurately identify the specific area and / or fault phase where the fault occurs, and only remove the faulty part from the system to minimize the scope of the power outage and ensure that the fault-free part of the system continues to operate safely. The importance of selective protection lies in its ability to improve the reliability and stability of the power system, reduce unnecessary power outages, and ensure normal power consumption for users. Traditional electrical system protection schemes usually use two selective protection methods: current selectivity and time selectivity.

[0003] However, the existing technology has certain limitations in terms of selective protection. The measured action time of the time-limited overcurrent protection is only measured in each level of the switch, and the selectivity of the entire system cannot be fully verified. Therefore, there is room for improvement. Summary of the invention

[0004] The object of the present invention is to provide an analysis method, device, equipment and medium for the selective area of ​​electrical protection, which can comprehensively verify the selectivity of the entire system.

[0005] In order to solve the above technical problems, the present invention is achieved through the following technical solutions:

[0006] The present invention provides an analysis method for an electrical protection selective area, comprising:

[0007] Obtain the first inverse time overcurrent protection action function and the upstream definite time protection fixed value current of the upstream switch circuit breaker; obtain the second inverse time overcurrent protection action function and the downstream definite time protection fixed value current of the downstream switch circuit breaker; obtain the three-phase short-circuit current of the busbar;

[0008] Apply the downstream definite time protection fixed value current, the upstream definite time protection fixed value current, and the three-phase short-circuit current to the busbar respectively to calculate the corresponding protection action time and the intersection point of the first inverse time overcurrent protection action function and the second inverse time overcurrent protection action function;

[0009] Judging whether the corresponding area is selective according to the protection action time, the intersection and the preset area;

[0010] When any area is not selective, the parameters of the first inverse time overcurrent protection action function and / or the second inverse time overcurrent protection action function are adjusted, and the determination is repeated until all areas are selective at the same time.

[0011] In one embodiment of the present invention, the step of judging whether the corresponding area is selective according to the protection action time, the intersection and the preset area includes:

[0012] When applying the downstream definite time protection set value current to the bus, judging whether the first area is selective by comparing the corresponding protection action time, the intersection and the first area, wherein the first area is represented by a current range less than the downstream definite time protection set value current;

[0013] When applying the upstream definite time protection set current to the bus, judging whether the second area is selective by comparing the corresponding protection action time, the intersection and the second area, wherein the second area is represented by a current range greater than or equal to the downstream definite time protection set current and less than the upstream definite time protection set current;

[0014] When a three-phase short-circuit current is applied to the bus, whether the third area is selective is determined by comparing the corresponding protection action time, the intersection and the third area, wherein the third area is represented by a current range that is greater than or equal to the upstream time-limited protection set current and less than or equal to the three-phase short-circuit current.

[0015] In one embodiment of the present invention, when applying the downstream definite time protection fixed value current to the bus, the step of judging whether the first area is selective by comparing the corresponding protection action time, the intersection and the first area comprises:

[0016] When applying a downstream time-limited protection fixed value current to the busbar, a first upstream inverse time overcurrent protection time of the upstream switch circuit breaker is calculated according to the first inverse time overcurrent protection action function, and a first downstream inverse time overcurrent protection time of the downstream switch circuit breaker is calculated according to the second inverse time overcurrent protection action function;

[0017] Obtain the downstream fixed-limit time of the downstream switch circuit breaker; determine whether the first area is selective based on the comparison result of the first upstream inverse time overcurrent protection time, the first downstream inverse time overcurrent protection time, the downstream fixed-limit time, and the comparison result between the intersection and the first area.

[0018] In one embodiment of the present invention, the step of judging whether the first area is selective according to the comparison result of the first upstream inverse time overcurrent protection time, the first downstream inverse time overcurrent protection time, the upstream definite time, and the comparison result of the intersection and the first area includes:

[0019] Determine the first upstream inverse time overcurrent protection time, the first downstream inverse time overcurrent protection time, the downstream definite time, the intersection, and the first area:

[0020] When the first upstream inverse time overcurrent protection time is greater than or equal to the downstream definite time, the first area is selective;

[0021] When the first upstream inverse time overcurrent protection time is greater than or equal to the first downstream inverse time overcurrent protection time and the intersection is not within the first area, the first area is selective;

[0022] Otherwise, the first region is not selective.

[0023] In one embodiment of the present invention, when applying the upstream definite time protection fixed value current to the bus, the step of judging whether the second area is selective by comparing the corresponding protection action time, the intersection and the second area comprises:

[0024] When applying an upstream time-limited protection fixed value current to the busbar, a second upstream inverse time-limited overcurrent protection time of the upstream switch circuit breaker is calculated according to the first inverse time-limited overcurrent protection action function, and a second downstream inverse time-limited overcurrent protection time of the downstream switch circuit breaker is calculated according to the second inverse time-limited overcurrent protection action function;

[0025] Obtain the upstream fixed-limit time of the upstream switch circuit breaker; determine whether the second area is selective based on the comparison result of the second upstream inverse time overcurrent protection time, the second downstream inverse time overcurrent protection time, the upstream fixed-limit time, the downstream fixed-limit time, and the comparison result between the intersection and the second area.

[0026] In one embodiment of the present invention, the step of judging whether the second area is selective according to the comparison result of the second upstream inverse time overcurrent protection time, the second downstream inverse time overcurrent protection time, the upstream definite time, the downstream definite time, and the comparison result of the intersection and the second area includes:

[0027] Determine the second upstream inverse time overcurrent protection time, the second downstream inverse time overcurrent protection time, the upstream definite time, the downstream definite time, the intersection, and the second area:

[0028] When the upstream definite time is greater than or equal to the downstream definite time, the second area is selective;

[0029] When the upstream definite time is greater than or equal to the second downstream inverse time overcurrent protection time, the second area is selective;

[0030] When the second upstream inverse time overcurrent protection time is greater than or equal to the second downstream inverse time overcurrent protection time and the intersection is not within the second area, the second area is selective;

[0031] The second area is selective when the second upstream inverse time overcurrent protection time is greater than or equal to the second downstream inverse time overcurrent protection time, the intersection is within the second area, the second upstream inverse time overcurrent protection time is greater than the downstream definite time, and the second downstream inverse time overcurrent protection time is greater than the downstream definite time;

[0032] Otherwise, the second region is not selective.

[0033] In one embodiment of the present invention, when a three-phase short-circuit current is applied to the bus, the step of judging whether the third area is selective by comparing the corresponding protection action time, the intersection and the third area includes:

[0034] When a three-phase short-circuit current is applied to the busbar, a third upstream inverse time overcurrent protection time of the upstream switch circuit breaker is calculated according to the first inverse time overcurrent protection action function, and a third downstream inverse time overcurrent protection time of the downstream switch circuit breaker is calculated according to the second inverse time overcurrent protection action function;

[0035] Whether the third area is selective is determined based on the comparison results of the third upstream inverse time overcurrent protection time, the third downstream inverse time overcurrent protection time, the upstream definite time, the downstream definite time, and the comparison results between the intersection and the third area.

[0036] In one embodiment of the present invention, the step of judging whether the third area is selective according to the comparison result of the third upstream inverse time overcurrent protection time, the third downstream inverse time overcurrent protection time, the upstream definite time, the downstream definite time, and the comparison result of the intersection and the third area includes:

[0037] Determine the third upstream inverse time overcurrent protection time, the third downstream inverse time overcurrent protection time, the upstream definite time, the downstream definite time, the intersection, and the third area:

[0038] When the third upstream inverse time overcurrent protection time is greater than or equal to the third downstream inverse time overcurrent protection time and the intersection is not within the third area, the third area is selective;

[0039] When the third upstream inverse time overcurrent protection time is greater than or equal to the third downstream inverse time overcurrent protection time, the intersection is within the third area, the third upstream inverse time overcurrent protection time is less than or equal to the upstream definite time, and the third downstream inverse time overcurrent protection time is greater than the downstream definite time, the third area is selective;

[0040] The third area is selective when the third upstream inverse time overcurrent protection time is greater than or equal to the third downstream inverse time overcurrent protection time, the intersection is within the third area, the third upstream inverse time overcurrent protection time is greater than the upstream definite time, the third downstream inverse time overcurrent protection time is less than or equal to the upstream definite time, and the third downstream inverse time overcurrent protection time is greater than the downstream definite time;

[0041] Otherwise, the third region is not selective.

[0042] In one embodiment of the present invention, when any area does not have selectivity, the step of adjusting the parameters of the first inverse time overcurrent protection action function and / or the second inverse time overcurrent protection action function, and repeating the judgment until all areas have selectivity at the same time includes:

[0043] Determine whether the first area, the second area, and the third area are all selective:

[0044] When any one of the first area, the second area, and the third area is not selective, adjust the parameters of the first inverse time overcurrent protection action function and / or the second inverse time overcurrent protection action function, and repeat the judgment until the first area, the second area, and the third area are all selective.

[0045] The present invention also provides an analysis device for an electrical protection selective area, comprising:

[0046] A data acquisition module is used to acquire the first inverse time overcurrent protection action function, the upstream definite time, and the upstream definite time protection fixed value current of the upstream switch circuit breaker; acquire the second inverse time overcurrent protection action function, the downstream definite time, and the downstream definite time protection fixed value current of the downstream switch circuit breaker; and acquire the three-phase short-circuit current of the busbar;

[0047] A data calculation module, used for applying the downstream definite time protection fixed value current, the upstream definite time protection fixed value current, and the three-phase short-circuit current to the busbar respectively, so as to calculate the corresponding protection action time, and the intersection point of the first inverse time overcurrent protection action function and the second inverse time overcurrent protection action function;

[0048] A data judgment module, used to judge whether the corresponding area is selective according to the protection action time, the intersection and the preset area; and

[0049] The analysis and adjustment module is used to adjust the parameters of the first inverse time overcurrent protection action function and / or the second inverse time overcurrent protection action function when any area is not selective, and repeat the judgment until all areas are selective at the same time.

[0050] The present invention also provides a computer device, comprising a memory, a processor, and a computer program stored in the memory and executable on the processor. When the processor executes the computer program, the steps of the analysis method for the electrical protection selective area are implemented.

[0051] The present invention also provides a computer-readable storage medium, which stores a computer program. When the computer program is executed by a processor, the steps of analyzing the electrical protection selective area are implemented.

[0052] As described above, the present invention provides an analysis method, device, equipment and medium for the selective area of ​​electrical protection. By verifying and analyzing the cross-influence between the inverse time overcurrent protection and the fixed time overcurrent protection, it is ensured that the switches and circuit breakers at all levels can operate correctly and orderly, avoid simultaneous operation or malfunction, and improve the overall reliability of the system. By evaluating the selectivity of the inverse time and fixed time protection settings of the switches and circuit breakers at all levels under actual fault conditions, it is ensured that when a fault occurs, only the faulty part is cut off, while the other parts of the system can continue to operate normally, avoiding unnecessary large-scale power outages. Through comprehensive verification and analysis, problems in the protection settings can be discovered and corrected in a timely manner, reducing the risk of malfunction and refusal to operate due to improper protection settings, and improving the safety and stability of the power system.

[0053] Of course, any product implementing the present invention does not necessarily need to achieve all of the advantages described above at the same time. BRIEF DESCRIPTION OF THE DRAWINGS

[0054] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the accompanying drawings required for describing the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other accompanying drawings can be obtained based on these accompanying drawings without paying creative work.

[0055] Figure 1 is a flow chart of a method for analyzing a selective area of ​​electrical protection in one embodiment of the present invention;

[0056] Figure 2A schematic diagram of the connection between an upstream switch circuit breaker and a downstream switch circuit breaker in one embodiment of the present invention;

[0057] Figure 3 is a schematic diagram of analyzing a first region in one embodiment of the present invention;

[0058] Figure 4 is a schematic diagram of analyzing the second region in one embodiment of the present invention;

[0059] Figure 5 is a schematic diagram of analyzing the third area in one embodiment of the present invention;

[0060] Figure 6 A schematic diagram of an analysis device for electrical protection selective areas according to an embodiment of the present invention;

[0061] Figure 7 FIG. 4 is a schematic diagram of an electronic device according to an embodiment of the present invention.

[0062] In the figure: 100, data acquisition module; 200, data calculation module; 300, data judgment module; 400, analysis and adjustment module; 1, electronic device; 12, memory; 13, processor. DETAILED DESCRIPTION

[0063] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0064] See also Figure 1 The present invention provides an analysis method for the electrical protection selectivity area, which can analyze whether the electrical protection of the electrical system of a nuclear power plant has selectivity. The analysis method may include the following steps:

[0065] Step S10, obtaining the first inverse time overcurrent protection action function (T1) of the upstream switch circuit breaker (QF1), the upstream definite time protection constant current (I st-QF1 ); obtain the second inverse time overcurrent protection action function (T2) of the downstream switch circuit breaker (QF2), the downstream definite time protection fixed value current (I st-QF2 ); Get the three-phase short-circuit current of the busbar (I d-三相短路 );

[0066] Step S20: Apply downstream definite time protection fixed value current (I st-QF2 ), upstream definite time protection fixed value current (I st-QF1), three-phase short-circuit current (I d-三相短路 ), to calculate the corresponding protection action time, the intersection point of the first inverse time overcurrent protection action function (T1) and the second inverse time overcurrent protection action function (T2);

[0067] Step S30, judging whether the corresponding area is selective according to the protection action time, the intersection and the preset area;

[0068] Step S40: When any area is not selective, adjust the parameters of the first inverse time overcurrent protection action function (T1) and / or the second inverse time overcurrent protection action function (T2), and repeat the judgment until all areas are selective at the same time.

[0069] See also Figure 2 In one embodiment, when executing step S10, specifically, the upstream switch circuit breaker (QF1) refers to the incoming circuit breaker of the upstream system of the nuclear power plant electrical system. The downstream switch circuit breaker (QF2) refers to the incoming circuit breaker of the downstream system of the nuclear power plant electrical system. When an abnormal current (such as a short circuit or overload) is detected in the circuit, the incoming circuit breaker will automatically disconnect, thereby protecting the nuclear power plant electrical system and the electrical equipment thereon from damage. The upstream switch circuit breaker (QF1) refers to the incoming circuit breaker located upstream of the downstream switch circuit breaker (QF2).

[0070] In one embodiment, inverse time overcurrent protection is a protection mechanism that adjusts its action time according to the magnitude of the current flowing through the switch circuit breaker. The greater the fault current, the shorter the action time of the circuit breaker. Each switch circuit breaker will have a corresponding inverse time overcurrent protection action function. Therefore, the first inverse time overcurrent protection action function (T1) of the upstream switch circuit breaker (QF1) and the second inverse time overcurrent protection action function (T2) of the downstream switch circuit breaker (QF2) can be obtained. Among them, T1 = f(x1); T2 = f(x2). Among them, x1 / x2 represents the magnitude of the fault current, and T1 / T2 represents the action time of the circuit breaker.

[0071] In one embodiment, time-limited protection refers to maintaining a fixed action time within the entire protection current range. This protection method is suitable for short-circuit protection and is usually used in conjunction with inverse time protection to provide more comprehensive protection. Each switch circuit breaker will have a corresponding time-limited protection current setting. The time-limited protection current setting is the set current value of the time-limited protection of the switch circuit breaker. When the actual current exceeds this set current value, the corresponding switch circuit breaker will be disconnected within a predetermined time to protect the upstream power system from the impact of short-circuit faults. Therefore, the upstream time-limited protection setting current (I st-QF1) and the downstream definite time protection setting current (I st-QF2 ).

[0072] In one embodiment, the three-phase short-circuit current (I d-三相短路 ) refers to the short-circuit current value flowing when a three-phase short circuit occurs at the busbar (i.e., the main conductor used to distribute electricity in the power system). Three-phase short circuit is the most serious form of short circuit in the power system because its current value is the largest and the impact on the system and equipment is also the greatest. Obtaining this value helps to design and select appropriate circuit breakers and protective devices to ensure that the system can be safely cut off when a three-phase short circuit occurs.

[0073] In one embodiment, when executing step S20, specifically, in the electrical system of the nuclear power plant, the action time of the inverse time overcurrent protection is nonlinear and decreases with the increase of the fault current. In order to ensure selective protection, it is necessary to calculate the intersection of the inverse time overcurrent protection action time function of the upstream switch circuit breaker (QF1) and the downstream switch circuit breaker (QF2), that is, calculate the intersection of the first inverse time overcurrent protection action function (T1) and the second inverse time overcurrent protection action function (T2). The intersection means that under a certain specific fault current, the action time of the two protection devices is the same. Through this intersection, the action time of each level of protection devices can be better coordinated and set to ensure the effective implementation of selective protection.

[0074] In one embodiment, due to the downstream definite time protection setting current (I st-QF2 ) is less than the upstream definite time protection setting current (I st-QF1 ), upstream definite time protection setting current (I st-QF1 ) is less than the three-phase short-circuit current (I d-三相短路 ), therefore, the downstream definite time protection fixed current (I st-QF2 ), upstream definite time protection fixed value current (I st-QF1 ), three-phase short-circuit current (I d-三相短路 ) sets different areas. The different areas include a first area, a second area, and a third area.

[0075] In one embodiment, the first region can be represented as a current less than the downstream definite time protection setting value current (I st-QF2 ) current range. The second region can be expressed as a current range greater than or equal to the downstream definite time protection setting current (I st-QF2 ) and is less than the upstream definite time protection setting current (I st-QF1 ) current range. The third region can be represented by the fault current being greater than or equal to the upstream definite time protection setting current (I st-QF1 ) and is less than or equal to the three-phase short-circuit current (I d-三相短路) current range. By judging whether there is a matching interval between the inverse time overcurrent protection action time of the upstream switch circuit breaker (QF1), the definite time of the upstream switch circuit breaker (QF1), the inverse time overcurrent protection action time of the downstream switch circuit breaker (QF2), and the definite time of the downstream switch circuit breaker (QF2) in each area, it is judged whether there is selectivity in each area.

[0076] In one embodiment, when step S30 is executed, specifically, step S30 may include the following steps:

[0077] Step S31: Apply downstream definite time protection fixed value current (I st-QF2 ), the first area is judged to be selective by comparing the intersection point with the first area, where the first area is represented by a current less than the downstream definite time protection set value current (I st-QF2 ) current range;

[0078] Step S32: Applying the upstream definite time protection fixed value current (I st-QF1 ), the second area is judged to be selective by comparing the intersection point with the second area, where the second area is represented by a current greater than or equal to the downstream definite time protection set value current (I st-QF2 ) and is less than the upstream definite time protection setting current (I st-QF1 ) current range;

[0079] Step S33: Applying a three-phase short-circuit current (I d-三相短路 ), the comparison result between the intersection point and the third area is used to determine whether the third area is selective, wherein the third area is represented by a current greater than or equal to the upstream definite time protection set value current (I st-QF1 ) and is less than or equal to the three-phase short-circuit current (I d-三相短路 ) current range.

[0080] In one embodiment, when step S31 is executed, specifically, step S31 may include the following steps:

[0081] Step S311, when applying the downstream time-limited protection fixed value current (Ist-QF2) to the busbar, calculating the first upstream inverse time-limited overcurrent protection time (T11) of the upstream switch circuit breaker (QF1) according to the first inverse time-limited overcurrent protection action function (T1), and calculating the first downstream inverse time-limited overcurrent protection time (T21) of the downstream switch circuit breaker (QF2) according to the second inverse time-limited overcurrent protection action function (T2);

[0082] Step S312, obtain the downstream fixed-time limit time (T2D) of the downstream switch circuit breaker (QF2), and determine whether the first area is selective based on the comparison results of the first upstream inverse time overcurrent protection time (T11), the first downstream inverse time overcurrent protection time (T21), and the downstream fixed-time limit time (T2D), as well as the comparison results between the intersection and the first area.

[0083] In one embodiment, when executing step S311, specifically, in the electrical system of a nuclear power plant, in order to verify and ensure the selectivity of electrical protection, the actual operating time of the upstream switch circuit breaker (QF1) can be obtained through field tests. st-QF2 ), the first upstream inverse time overcurrent protection time (T11) of the upstream switch circuit breaker (QF1) and the first downstream inverse time overcurrent protection time (T21) of the downstream switch circuit breaker (QF2) can be obtained. The first upstream inverse time overcurrent protection time (T11) can also be calculated and obtained by the first inverse time overcurrent protection action function (T1). The first downstream inverse time overcurrent protection time (T21) can also be calculated and obtained by the second inverse time overcurrent protection action function (T2).

[0084] In one embodiment, when step S312 is executed, specifically, step S312 may include the following steps:

[0085] Step S3121, determine the first upstream inverse time overcurrent protection time (T11), the first downstream inverse time overcurrent protection time (T21), the downstream definite time (T2D), the intersection, and the first area:

[0086] Step S3122: when the first upstream inverse time overcurrent protection time (T11) is greater than or equal to the downstream definite time (T2D), the first area is selective;

[0087] Step S3123: When the first upstream inverse time overcurrent protection time (T11) is greater than or equal to the first downstream inverse time overcurrent protection time (T21) and the intersection is not within the first area, the first area is selective;

[0088] Step S3124: Otherwise, the first area is not selective.

[0089] See also Figure 3 In one embodiment, when executing step S3121, specifically, the downstream time-limited time (T2D) of the downstream switch circuit breaker (QF2) can be first obtained. The downstream time-limited time (T2D) refers to the downstream switch circuit breaker (QF2) acting after the downstream time-limited time (T2D) delays when the fault current (I) exceeds the set value. The downstream time-limited time (T2D) is preset.

[0090] In one embodiment, after obtaining the first upstream inverse time overcurrent protection time (T11), the first downstream inverse time overcurrent protection time (T21), the upstream definite time (T1D), the intersection, and the first area, these parameters can be judged to determine whether the first area has selectivity. Among them, selectivity means that when a fault occurs in the power system, the switch circuit breaker can accurately detect the fault area and / or fault phase, and minimize the power outage scope, only cut off the faulty part, and ensure that the fault-free part of the system can still operate safely.

[0091] In one embodiment, when executing step S3122 and step S3124, specifically, the magnitude of the first upstream inverse time overcurrent protection time (T11) and the downstream definite time (T2D) can be determined.

[0092] In one embodiment, when the first upstream inverse time overcurrent protection time (T11) is greater than or equal to the downstream definite time (T2D), the upstream switch circuit breaker (QF1) is actuated after or simultaneously with the downstream switch circuit breaker (QF2), that is, the first upstream inverse time overcurrent protection time is coordinated with the downstream definite time, and the first area is selective.

[0093] In one embodiment, when the first upstream inverse time overcurrent protection time (T11) is less than the downstream definite time (T2D), the upstream switch circuit breaker (QF1) is actuated before the downstream switch circuit breaker (QF2), that is, the first upstream inverse time overcurrent protection time is not coordinated with the downstream definite time, and the first area is not selective.

[0094] In one embodiment, when executing step S3123 and step S3124, specifically, the magnitudes of the first upstream inverse time overcurrent protection time (T11) and the first downstream inverse time overcurrent protection time (T21) can be determined.

[0095] In one embodiment, when the first upstream inverse time overcurrent protection time (T11) is less than the first downstream inverse time overcurrent protection time (T21), the upstream switch circuit breaker (QF1) is actuated before the downstream switch circuit breaker (QF2), that is, the first upstream inverse time overcurrent protection time is not coordinated with the first downstream inverse time overcurrent protection time, and the first area is not selective.

[0096] In one embodiment, when the first upstream inverse time overcurrent protection time (T11) is greater than or equal to the first downstream inverse time overcurrent protection time (T21), it is necessary to further determine the relationship between the location of the intersection and the first area.

[0097] In one embodiment, when the intersection is not within the first region, it can be considered that the first upstream inverse time overcurrent protection time is coordinated with the first downstream inverse time overcurrent protection time, and the first region is selective.

[0098] In one embodiment, when the intersection point is within the first region, it can be considered that the first upstream inverse time overcurrent protection time does not match the first downstream inverse time overcurrent protection time, and the first region is not selective.

[0099] In one embodiment, when step S32 is executed, specifically, step S32 may include the following steps:

[0100] Step S321: Apply upstream definite time protection fixed value current (I st-QF1 ), calculating the second upstream inverse time overcurrent protection time (T12) of the upstream switch circuit breaker by the first inverse time overcurrent protection action function (T1), and calculating the second downstream inverse time overcurrent protection time (T22) of the downstream switch circuit breaker by the second inverse time overcurrent protection action function (T2);

[0101] Step S322, obtain the upstream definite time (T1D) of the upstream switch circuit breaker (QF1); determine whether the second area is selective based on the comparison results of the second upstream inverse time overcurrent protection time (T12), the second downstream inverse time overcurrent protection time (T22), the upstream definite time (T1D), the downstream definite time (T2D), and the comparison results between the intersection and the second area.

[0102] In one embodiment, when executing step S321, specifically, in the electrical system of a nuclear power plant, in order to verify and ensure the selectivity of electrical protection, the actual action time of the upstream switch circuit breaker (QF1) can be obtained through field tests. st-QF1 ), the second upstream inverse time overcurrent protection time (T12) of the upstream switch circuit breaker (QF1) and the second downstream inverse time overcurrent protection time (T22) of the downstream switch circuit breaker (QF2) can be obtained. Among them, the second upstream inverse time overcurrent protection time (T12) can be calculated and obtained by the first inverse time overcurrent protection action function (T1). The second downstream inverse time overcurrent protection time (T22) can be calculated and obtained by the second inverse time overcurrent protection action function (T2).

[0103] In one embodiment, when step S322 is executed, specifically, step S322 may include the following steps:

[0104] Step S3221, determine the second upstream inverse time overcurrent protection time (T12), the second downstream inverse time overcurrent protection time (T22), the upstream definite time (T1D), the downstream definite time (T2D), the intersection, and the second area:

[0105] Step S3222: when the upstream definite time (T1D) is greater than or equal to the downstream definite time (T2D), the second area is selective;

[0106] Step S2223, when the upstream definite time (T1D) is greater than or equal to the second downstream inverse time overcurrent protection time (T22), the second area is selective;

[0107] Step S3224: when the second upstream inverse time overcurrent protection time (T12) is greater than or equal to the second downstream inverse time overcurrent protection time (T22) and the intersection is not within the second area, the second area is selective;

[0108] Step S3225: When the second upstream inverse time overcurrent protection time (T12) is greater than or equal to the second downstream inverse time overcurrent protection time (T22), the intersection is in the second area, the second upstream inverse time overcurrent protection time (T12) is greater than the downstream definite time (T2D), and the second downstream inverse time overcurrent protection time (T22) is greater than the downstream definite time (T2D), the second area is selective;

[0109] Step S3226: Otherwise, the second area is not selective.

[0110] See also Figure 4 In one embodiment, when executing step S3221, specifically, the upstream definite time (T1D) of the upstream switch circuit breaker (QF1) can be first obtained. The upstream definite time (T1D) refers to the upstream switch circuit breaker (QF1) acting after the upstream definite time (T1D) delays when the upstream switch circuit breaker (QF1) detects that the fault current exceeds the set value. The upstream definite time (T1D) is preset.

[0111] In one embodiment, after obtaining the second upstream inverse time overcurrent protection time (T12), the second downstream inverse time overcurrent protection time (T22), the upstream fixed time (T1D), the downstream fixed time (T2D), the intersection, and the second area, these parameters can be judged to determine whether the second area is selective.

[0112] In one embodiment, when step S3222 and step S3226 are executed, specifically, the size of the upstream definite time (T1D) and the downstream definite time (T2D) can be determined.

[0113] In one embodiment, when the upstream time-limited time (T1D) is greater than or equal to the downstream time-limited time (T2D), the upstream switch circuit breaker (QF1) is actuated after or simultaneously with the downstream switch circuit breaker (QF2), that is, the upstream time-limited time (T1D) is coordinated with the downstream time-limited time (T2D), and the second area is selective.

[0114] In one embodiment, when the upstream time-limited time (T1D) is less than the downstream time-limited time (T2D), the upstream switch circuit breaker (QF1) is actuated before the downstream switch circuit breaker (QF2), that is, the upstream time-limited time (T1D) and the downstream time-limited time (T2D) are not coordinated, and the second area is not selective.

[0115] In one embodiment, when executing step S3223 and step S3226, specifically, the size of the upstream definite time (T1D) and the second downstream inverse time overcurrent protection time (T22) can be determined.

[0116] In one embodiment, when the upstream definite time (T1D) is greater than or equal to the second downstream inverse time overcurrent protection time (T22), the upstream switch circuit breaker (QF1) is actuated after or simultaneously with the downstream switch circuit breaker (QF2), that is, the upstream definite time (T1D) is coordinated with the second downstream inverse time overcurrent protection time (T22), and the second area is selective.

[0117] In one embodiment, when the upstream definite time (T1D) is less than the second downstream inverse time overcurrent protection time (T22), the upstream switch circuit breaker (QF1) is actuated before the downstream switch circuit breaker (QF2), that is, the upstream definite time (T1D) is not coordinated with the second downstream inverse time overcurrent protection time (T22), and the second area is not selective.

[0118] In one embodiment, when executing step S3224 and step S3226, specifically, the magnitudes of the second upstream inverse time overcurrent protection time (T12) and the second downstream inverse time overcurrent protection time (T22) can be determined.

[0119] In one embodiment, when the second upstream inverse time overcurrent protection time (T12) is greater than or equal to the second downstream inverse time overcurrent protection time (T22), the upstream switch circuit breaker (QF1) is actuated after or at the same time as the downstream switch circuit breaker (QF2), that is, the second upstream inverse time overcurrent protection time (T12) and the second downstream inverse time overcurrent protection time (T22) are not coordinated, and the second area is not selective.

[0120] In one embodiment, when the second upstream inverse time overcurrent protection time (T12) is less than the second downstream inverse time overcurrent protection time (T22), it is necessary to further determine the relationship between the location of the intersection and the second area.

[0121] In one embodiment, when the intersection is not within the second region, it can be considered that the second upstream inverse time overcurrent protection time (T12) is less than the second downstream inverse time overcurrent protection time (T22), and the second region is selective.

[0122] In one embodiment, when executing steps S3225 and S3226, specifically, when the second upstream inverse time overcurrent protection time (T12) is greater than or equal to the second downstream inverse time overcurrent protection time (T22), and the intersection is within the second area, it is necessary to further judge the second upstream inverse time overcurrent protection time (T12) and the downstream fixed time (T2D).

[0123] In one embodiment, when the second upstream inverse time overcurrent protection time (T12) is less than or equal to the downstream fixed time (T2D), the second upstream inverse time overcurrent protection time (T12) is less than or equal to the downstream fixed time (T2D) and does not cooperate, the downstream switch circuit breaker (QF2) operates after the second downstream inverse time overcurrent protection time (T22), and the upstream switch circuit breaker (QF1) operates or does not operate after the second upstream inverse time overcurrent protection time (T12), and the second area is not selective.

[0124] In one embodiment, when the second upstream inverse time overcurrent protection time (T12) is greater than the downstream definite time (T2D), it is necessary to further determine the size of the second downstream inverse time overcurrent protection time (T22) and the downstream definite time (T2D).

[0125] In one embodiment, when the second downstream inverse time overcurrent protection time (T22) is greater than the downstream fixed time (T2D), the downstream switch circuit breaker (QF2) operates after the downstream fixed time (T2D), and the upstream switch circuit breaker (QF1) operates or does not operate after the second upstream inverse time overcurrent protection time (T12), and the second area is selective.

[0126] In one embodiment, when the second downstream inverse time overcurrent protection time (T22) is less than or equal to the downstream fixed time (T2D), the downstream switch circuit breaker (QF2) operates after the second downstream inverse time overcurrent protection time (T22), and the upstream switch circuit breaker (QF1) operates or does not operate after the second upstream inverse time overcurrent protection time (T12), and the second area is not selective.

[0127] In one embodiment, when step S33 is executed, specifically, step S33 may include the following steps:

[0128] Step S331: Apply a three-phase short-circuit current (I d-三相短路 ), a third upstream inverse time overcurrent protection time (T13) of the upstream switch circuit breaker is calculated by the first inverse time overcurrent protection action function (T1), and a third downstream inverse time overcurrent protection time (T23) of the downstream switch circuit breaker is calculated by the second inverse time overcurrent protection action function (T2);

[0129] Step S332, judging whether the third area is selective according to the comparison results of the third upstream inverse time overcurrent protection time (T13), the third downstream inverse time overcurrent protection time (T23), the upstream definite time (T1D), the downstream definite time (T2D), and the comparison results between the intersection and the third area.

[0130] In one embodiment, when executing step S331, specifically, in the electrical system of a nuclear power plant, in order to verify and ensure the selectivity of electrical protection, the actual action time of the upstream switch circuit breaker (QF1) can be obtained through field tests. d-三相短路 ), the third upstream inverse time overcurrent protection time (T13) of the upstream switch circuit breaker (QF1) and the third downstream inverse time overcurrent protection time (T23) of the downstream switch circuit breaker (QF2) can be obtained. Among them, the third upstream inverse time overcurrent protection time (T13) can be calculated and obtained by the first inverse time overcurrent protection action function (T1). The third downstream inverse time overcurrent protection time (T23) can be calculated and obtained by the second inverse time overcurrent protection action function (T2).

[0131] In one embodiment, when step S332 is executed, specifically, step S332 may include the following steps:

[0132] Step S3321, determine the third upstream inverse time overcurrent protection time (T13), the third downstream inverse time overcurrent protection time (T23), the upstream definite time (T1D), the downstream definite time (T2D), the intersection, and the third area:

[0133] Step S3322: when the third upstream inverse time overcurrent protection time (T13) is greater than or equal to the third downstream inverse time overcurrent protection time (T23) and the intersection is not within the third area, the third area is selective;

[0134] Step S3323: when the third upstream inverse time overcurrent protection time (T13) is greater than or equal to the third downstream inverse time overcurrent protection time (T23), the intersection is within the third area, the third upstream inverse time overcurrent protection time (T13) is less than or equal to the upstream definite time (T1D), and the third downstream inverse time overcurrent protection time (T23) is greater than the downstream definite time (T2D), the third area is selective;

[0135] Step S3324: when the third upstream inverse time overcurrent protection time (T13) is greater than or equal to the third downstream inverse time overcurrent protection time (T23), the intersection is within the third area, the third upstream inverse time overcurrent protection time (T13) is greater than the upstream definite time (T1D), the third downstream inverse time overcurrent protection time (T23) is less than or equal to the upstream definite time (T1D), and the third downstream inverse time overcurrent protection time (T23) is greater than the downstream definite time (T2D), the third area is selective;

[0136] Step S3325: Otherwise, the third area is not selective.

[0137] See also Figure 5 In one embodiment, when executing step S3321, specifically, after obtaining the third upstream inverse time overcurrent protection time (T13), the third downstream inverse time overcurrent protection time (T23), the upstream fixed time (T1D), the downstream fixed time (T2D), the intersection, and the third area, these parameters can be judged to determine whether the third area is selective.

[0138] In one embodiment, when executing step S3322 and step S3325, specifically, the magnitudes of the third upstream inverse time overcurrent protection time (T13) and the third downstream inverse time overcurrent protection time (T23) can be determined.

[0139] In one embodiment, when the third upstream inverse time overcurrent protection time (T13) is less than or equal to the third downstream inverse time overcurrent protection time (T23), the upstream switch circuit breaker (QF1) operates before or at the same time as the downstream switch circuit breaker (QF2), that is, the third upstream inverse time overcurrent protection time (T13) and the third downstream inverse time overcurrent protection time (T23) do not cooperate, and the third area is not selective.

[0140] In one embodiment, when the third upstream inverse time overcurrent protection time (T13) is greater than the third downstream inverse time overcurrent protection time (T23), it is necessary to further determine the relationship between the location of the intersection and the third area. When the intersection is not within the third area, the third upstream inverse time overcurrent protection time (T13) cooperates with the third downstream inverse time overcurrent protection time (T23), and the third area is selective.

[0141] In one embodiment, when executing step S3323 and step S3325, specifically, when the third upstream inverse time overcurrent protection time (T13) is greater than or equal to the third downstream inverse time overcurrent protection time (T23) and the intersection is within the third area, it is necessary to further judge the size of the third upstream inverse time overcurrent protection time (T13) and the upstream fixed time (T1D).

[0142] In one embodiment, when the third upstream inverse time overcurrent protection time (T13) is less than or equal to the upstream definite time (T1D), it is necessary to further determine the size of the third downstream inverse time overcurrent protection time (T23) and the downstream definite time (T2D).

[0143] In one embodiment, when the third downstream inverse time overcurrent protection time (T23) is greater than the downstream fixed time (T2D), the upstream switch circuit breaker (QF1) is actuated after the third upstream inverse time overcurrent protection time (T13), and the downstream switch circuit breaker (QF2) is actuated after the downstream fixed time (T2D), and the third area is selective.

[0144] In one embodiment, when the third downstream inverse time overcurrent protection time (T23) is less than or equal to the downstream definite time (T2D), it is necessary to further determine the size of the third upstream inverse time overcurrent protection time (T13) and the downstream definite time (T2D).

[0145] In one embodiment, when the third upstream inverse time overcurrent protection time (T13) is greater than the downstream fixed time (T2D), the third upstream inverse time overcurrent protection time (T13) is coordinated with the downstream fixed time (T2D), the upstream switch circuit breaker (QF1) is actuated after the third upstream inverse time overcurrent protection time (T13), and the downstream switch circuit breaker (QF2) is actuated after the third downstream inverse time overcurrent protection time (T23), and the third area is not selective.

[0146] In one embodiment, when the third upstream inverse time overcurrent protection time (T13) is less than or equal to the downstream definite time (T2D), the third upstream inverse time overcurrent protection time (T13) does not match the downstream definite time (T2D), and the third area is not selective.

[0147] In one embodiment, when executing step S3324 and step S3325, specifically, when the third upstream inverse time overcurrent protection time (T13) is greater than the upstream fixed time (T1D), it is necessary to further judge the size of the third downstream inverse time overcurrent protection time (T23) and the upstream fixed time (T1D).

[0148] In one embodiment, when the third downstream inverse time overcurrent protection time (T23) is greater than the upstream definite time (T1D), the third downstream inverse time overcurrent protection time (T23) does not match the upstream definite time (T1D), and the third area is not selective.

[0149] In one embodiment, when the third downstream inverse time overcurrent protection time (T23) is less than or equal to the upstream definite time (T1D), it is necessary to further determine the size of the third downstream inverse time overcurrent protection time (T23) and the downstream definite time (T2D).

[0150] In one embodiment, when the third downstream inverse time overcurrent protection time (T23) is greater than the downstream fixed time (T2D), the upstream switch circuit breaker (QF1) is actuated after the upstream fixed time (T1D), and the downstream switch circuit breaker (QF2) is actuated after the downstream fixed time (T2D), and the third area is selective.

[0151] In one embodiment, when the third downstream inverse time overcurrent protection time (T23) is less than or equal to the downstream definite time (T2D), the upstream switch circuit breaker (QF1) operates after the upstream definite time (T1D), and the downstream switch circuit breaker (QF2) operates after the third downstream inverse time overcurrent protection time (T23) or the downstream definite time (T2D), and the third area is not selective.

[0152] In one embodiment, when step S40 is executed, specifically, step S40 may include the following steps:

[0153] Step S41, determining whether the first area, the second area, and the third area are all selective:

[0154] Step S42, when any one of the first area, the second area, and the third area is not selective, adjusting the parameters of the first inverse time overcurrent protection action function (T1) and / or the second inverse time overcurrent protection action function (T2), and repeating the judgment until the first area, the second area, and the third area are all selective;

[0155] Step S43, when the first area, the second area, and the third area are all selective, the analysis of the electrical protection selective area is completed.

[0156] See also Figure 3 , Figure 4 and Figure 5In one embodiment, when executing step S41, step S42 and step S43, when the first area is not selective and the second area and the third area are selective, the parameters of the first inverse time overcurrent protection action function (T1) and / or the second inverse time overcurrent protection action function (T2) can be adjusted to adjust the values ​​of T11, T12, T13, T21, T22 and T23, and then re-judge. At this time, the first area and the second area may be selective, while the third area is not selective. Subsequently, the parameters can be adjusted again until all areas are selective. For example, the curve of the first inverse time overcurrent protection action function (T1) before adjustment is QF1 inverse time action curve 1.1, and the curve of the second inverse time overcurrent protection action function (T2) before adjustment is QF2 inverse time action curve 2. After adjustment, the adjusted curve of the first inverse time overcurrent protection action function (T1) is QF1 inverse time action curve 1.2.

[0157] In one embodiment, during the above-mentioned process of applying the fault current, the magnitude of the fault current needs to be equal to the upstream definite time protection set value current (I st-QF1 ), downstream definite time protection fixed value current (I st-QF2 ), three-phase short-circuit current (I d-三相短路 ). In actual process, the applied fault current needs to be greater than the corresponding current setting value. For example, the magnitude of the fault current can be set to 1.05 times the upstream definite time protection setting current (I st-QF1 ), 1.05 times the downstream definite time protection setting current (I st-QF2 ), three-phase short-circuit current (I d-三相短路 ).

[0158] It can be seen that in the above scheme, by verifying and analyzing the cross-influence between the inverse time overcurrent protection and the definite time overcurrent protection, it is ensured that the switches and circuit breakers at all levels can operate correctly and orderly, avoiding simultaneous operation or malfunction, and improving the overall reliability of the system. By evaluating the selectivity of the inverse time and definite time protection settings of the switches and circuit breakers at all levels under actual fault conditions, it is ensured that when a fault occurs, only the faulty part is cut off, while the rest of the system can continue to operate normally, avoiding unnecessary large-scale power outages. Through comprehensive verification and analysis, problems in the protection settings can be discovered and corrected in a timely manner, reducing the risk of malfunction and refusal to operate due to improper protection settings, and improving the safety and stability of the power system.

[0159] It should be understood that the order of execution of the steps in the above embodiment does not necessarily mean the order of execution. The execution order of each process should be determined by its function and internal logic, and should not constitute any limitation on the implementation process of the embodiment of the present invention.

[0160] See also Figure 6 The present invention also provides an analysis device for electrical protection selective areas, which can be applied in the above analysis method. The analysis device can include a data acquisition module 100, a data calculation module 200, a data judgment module 300 and an analysis and adjustment module 400.

[0161] In one embodiment, the data acquisition module 100 can be used to obtain the first inverse time overcurrent protection action function (T1) of the upstream switch circuit breaker (QF1), the upstream definite time protection fixed value current (I st-QF1 ); obtain the second inverse time overcurrent protection action function (T2) of the downstream switch circuit breaker (QF2), the downstream definite time protection fixed value current (I st-QF2 ); Get the three-phase short-circuit current of the busbar (I d-三相短路 ).

[0162] In one embodiment, the data calculation module 200 can be used to apply downstream definite time protection fixed value current (I st-QF2 ), upstream definite time protection fixed value current (I st-QF1 ), three-phase short-circuit current (I d-三相短路 ) to calculate the intersection of the corresponding first inverse time overcurrent protection action function (T1) and the second inverse time overcurrent protection action function (T2).

[0163] In one embodiment, the data determination module 300 may be used to determine whether the corresponding area is selective based on the intersection and the preset area.

[0164] In one embodiment, the analysis and adjustment module 400 can be used to adjust the parameters of the first inverse time overcurrent protection action function (T1) and / or the second inverse time overcurrent protection action function (T2) when any area is not selective, and repeat the judgment until all areas are selective at the same time.

[0165] See also Figure 7 In one embodiment, the electronic device 1 may include a memory 12, a processor 13 and a bus, and may also include a computer program stored in the memory 12 and executable on the processor 13, such as an analysis program.

[0166] In one embodiment, the memory 12 includes at least one type of readable storage medium, and the readable storage medium includes a flash memory, a mobile hard disk, a multimedia card, a card-type memory (e.g., SD or DX memory, etc.), a magnetic memory, a disk, an optical disk, etc. In some embodiments, the memory 12 may be an internal storage unit of the electronic device 1, such as a mobile hard disk of the electronic device 1. In other embodiments, the memory 12 may also be an external storage device of the electronic device 1, such as a plug-in mobile hard disk, a smart memory card (Smart Media Card, SMC), a secure digital (Secure Digital, SD) card, a flash card (Flash Card), etc. equipped on the electronic device 1. Further, the memory 12 may also include both an internal storage unit of the electronic device 1 and an external storage device. The memory 12 may be used not only to store application software and various types of data installed in the electronic device 1, such as analysis codes, etc., but also to temporarily store data that has been output or is to be output.

[0167] In one embodiment, the processor 13 may be composed of an integrated circuit, for example, a single packaged integrated circuit, or a plurality of packaged integrated circuits with the same or different functions, including one or more central processing units (CPUs), microprocessors, digital processing chips, graphics processors, and combinations of various control chips. The processor 13 is the control core (ControlUnit) of the electronic device 1, and uses various interfaces and lines to connect various components of the entire electronic device 1, and executes or executes programs or modules stored in the memory 12, and calls data stored in the memory 12, so as to execute various functions of the electronic device 1 and process data.

[0168] In one embodiment, the processor 13 executes the operating modules and various installed applications of the electronic device 1. The processor 13 executes the application to implement the steps in the above analysis method.

[0169] In one embodiment, the computer program may be divided into one or more modules, one or more modules are stored in the memory 12, and executed by the processor 13 to complete the present application. One or more modules may be a series of computer program instruction segments capable of completing specific functions, and the instruction segments are used to describe the execution process of the computer program in the electronic device 1.

[0170] The embodiments of the present invention disclosed above are only used to help illustrate the present invention. The embodiments do not describe all the details in detail, nor do they limit the invention to the specific embodiments described. Obviously, many modifications and changes can be made according to the content of this specification. This specification selects and specifically describes these embodiments in order to better explain the principles and practical applications of the present invention, so that those skilled in the art can understand and use the present invention well. The present invention is limited only by the claims and their full scope and equivalents.

Claims

1. A method for analyzing electrical protection selective areas, characterized in that: include: Obtaining the first inverse time overcurrent protection action function and the upstream definite time protection fixed value current of the upstream switch circuit breaker; Obtain the second inverse time overcurrent protection action function of the downstream switch circuit breaker and the downstream definite time protection fixed value current; obtain the three-phase short-circuit current of the busbar; Apply the downstream definite time protection fixed value current, the upstream definite time protection fixed value current, and the three-phase short-circuit current to the busbar respectively, so as to calculate the corresponding protection action time and the intersection point of the corresponding first inverse time overcurrent protection action function and the second inverse time overcurrent protection action function; Judging whether the corresponding area is selective according to the protection action time, the intersection and the preset area; When any area is not selective, the parameters of the first inverse time overcurrent protection action function and / or the second inverse time overcurrent protection action function are adjusted, and the determination is repeated until all areas are selective at the same time.

2. The method for analyzing the electrical protection selective area according to claim 1, characterized in that: The step of judging whether the corresponding area is selective according to the protection action time, the intersection and the preset area includes: When applying the downstream definite time protection set value current to the bus, judging whether the first area is selective by comparing the corresponding protection action time, the intersection and the first area, wherein the first area is represented by a current range less than the downstream definite time protection set value current; When applying the upstream definite time protection set current to the bus, judging whether the second area is selective by comparing the corresponding protection action time, the intersection and the second area, wherein the second area is represented by a current range greater than or equal to the downstream definite time protection set current and less than the upstream definite time protection set current; When a three-phase short-circuit current is applied to the bus, whether the third area is selective is determined by comparing the corresponding protection action time, the intersection and the third area, wherein the third area is represented by a current range that is greater than or equal to the upstream time-limited protection set current and less than or equal to the three-phase short-circuit current.

3. The method for analyzing the electrical protection selective area according to claim 2, characterized in that: The step of judging whether the first area is selective by comparing the corresponding protection action time, the intersection and the first area when applying the downstream definite time protection fixed value current to the bus comprises: When applying a downstream time-limited protection fixed value current to the busbar, a first upstream inverse time overcurrent protection time of the upstream switch circuit breaker is calculated according to the first inverse time overcurrent protection action function, and a first downstream inverse time overcurrent protection time of the downstream switch circuit breaker is calculated according to the second inverse time overcurrent protection action function; Obtain the downstream fixed-limit time of the downstream switch circuit breaker; determine whether the first area is selective based on the comparison result of the first upstream inverse time overcurrent protection time, the first downstream inverse time overcurrent protection time, the downstream fixed-limit time, and the comparison result between the intersection and the first area.

4. The method for analyzing the electrical protection selective area according to claim 3, characterized in that: The step of judging whether the first area is selective according to the comparison result of the first upstream inverse time overcurrent protection time, the first downstream inverse time overcurrent protection time, the upstream definite time, and the comparison result of the intersection and the first area comprises: Determine the first upstream inverse time overcurrent protection time, the first downstream inverse time overcurrent protection time, the downstream definite time, the intersection, and the first area: When the first upstream inverse time overcurrent protection time is greater than or equal to the downstream definite time, the first area is selective; When the first upstream inverse time overcurrent protection time is greater than or equal to the first downstream inverse time overcurrent protection time and the intersection is not within the first area, the first area is selective; Otherwise, the first region is not selective.

5. The method for analyzing the electrical protection selective area according to claim 3, characterized in that: The step of judging whether the second area is selective by comparing the corresponding protection action time, the intersection and the second area when applying the upstream definite time protection fixed value current to the bus comprises: When applying an upstream time-limited protection fixed value current to the busbar, a second upstream inverse time-limited overcurrent protection time of the upstream switch circuit breaker is calculated according to the first inverse time-limited overcurrent protection action function, and a second downstream inverse time-limited overcurrent protection time of the downstream switch circuit breaker is calculated according to the second inverse time-limited overcurrent protection action function; Obtain the upstream fixed-limit time of the upstream switch circuit breaker; determine whether the second area is selective based on the comparison result of the second upstream inverse time overcurrent protection time, the second downstream inverse time overcurrent protection time, the upstream fixed-limit time, the downstream fixed-limit time, and the comparison result between the intersection and the second area.

6. The method for analyzing the electrical protection selective area according to claim 5, characterized in that: The step of judging whether the second area is selective according to the comparison result of the second upstream inverse time overcurrent protection time, the second downstream inverse time overcurrent protection time, the upstream definite time, the downstream definite time, and the comparison result of the intersection and the second area comprises: Determine the second upstream inverse time overcurrent protection time, the second downstream inverse time overcurrent protection time, the upstream definite time, the downstream definite time, the intersection, and the second area: When the upstream definite time is greater than or equal to the downstream definite time, the second area is selective; When the upstream definite time is greater than or equal to the second downstream inverse time overcurrent protection time, the second area is selective; When the second upstream inverse time overcurrent protection time is greater than or equal to the second downstream inverse time overcurrent protection time and the intersection is not within the second area, the second area is selective; The second area is selective when the second upstream inverse time overcurrent protection time is greater than or equal to the second downstream inverse time overcurrent protection time, the intersection is within the second area, the second upstream inverse time overcurrent protection time is greater than the downstream definite time, and the second downstream inverse time overcurrent protection time is greater than the downstream definite time; Otherwise, the second region is not selective.

7. The method for analyzing the electrical protection selective area according to claim 5, characterized in that: The step of judging whether the third area is selective by comparing the corresponding protection action time, the intersection and the third area when applying the three-phase short-circuit current to the bus comprises: When a three-phase short-circuit current is applied to the busbar, a third upstream inverse time overcurrent protection time of the upstream switch circuit breaker is calculated according to the first inverse time overcurrent protection action function, and a third downstream inverse time overcurrent protection time of the downstream switch circuit breaker is calculated according to the second inverse time overcurrent protection action function; Whether the third area is selective is determined based on the comparison results of the third upstream inverse time overcurrent protection time, the third downstream inverse time overcurrent protection time, the upstream definite time, the downstream definite time, and the comparison results between the intersection and the third area.

8. The method for analyzing the electrical protection selective area according to claim 7, characterized in that: The step of judging whether the third area is selective according to the comparison result of the third upstream inverse time overcurrent protection time, the third downstream inverse time overcurrent protection time, the upstream definite time, the downstream definite time, and the comparison result of the intersection and the third area comprises: Determine the third upstream inverse time overcurrent protection time, the third downstream inverse time overcurrent protection time, the upstream definite time, the downstream definite time, the intersection, and the third area: When the third upstream inverse time overcurrent protection time is greater than or equal to the third downstream inverse time overcurrent protection time and the intersection is not within the third area, the third area is selective; When the third upstream inverse time overcurrent protection time is greater than or equal to the third downstream inverse time overcurrent protection time, the intersection is within the third area, the third upstream inverse time overcurrent protection time is less than or equal to the upstream definite time, and the third downstream inverse time overcurrent protection time is greater than the downstream definite time, the third area is selective; The third area is selective when the third upstream inverse time overcurrent protection time is greater than or equal to the third downstream inverse time overcurrent protection time, the intersection is within the third area, the third upstream inverse time overcurrent protection time is greater than the upstream definite time, the third downstream inverse time overcurrent protection time is less than or equal to the upstream definite time, and the third downstream inverse time overcurrent protection time is greater than the downstream definite time; Otherwise, the third region is not selective.

9. The method for analyzing the electrical protection selective area according to claim 7, characterized in that: The step of adjusting the parameters of the first inverse time overcurrent protection action function and / or the second inverse time overcurrent protection action function when any area does not have selectivity, and repeating the judgment until all areas have selectivity at the same time includes: Determine whether the first area, the second area, and the third area are all selective: When any one of the first area, the second area, and the third area is not selective, adjust the parameters of the first inverse time overcurrent protection action function and / or the second inverse time overcurrent protection action function, and repeat the judgment until the first area, the second area, and the third area are all selective.

10. An analysis device for electrical protection selective areas, characterized in that: include: A data acquisition module is used to acquire the first inverse time overcurrent protection action function, the upstream definite time, and the upstream definite time protection fixed value current of the upstream switch circuit breaker; acquire the second inverse time overcurrent protection action function, the downstream definite time, and the downstream definite time protection fixed value current of the downstream switch circuit breaker; and acquire the three-phase short-circuit current of the busbar; A data calculation module, used for applying the downstream definite time protection fixed value current, the upstream definite time protection fixed value current, and the three-phase short-circuit current to the busbar respectively, so as to calculate the corresponding protection action time, and the intersection point of the first inverse time overcurrent protection action function and the second inverse time overcurrent protection action function; A data judgment module, used to judge whether the corresponding area is selective according to the protection action time, the intersection and the preset area; as well as The analysis and adjustment module is used to adjust the parameters of the first inverse time overcurrent protection action function and / or the second inverse time overcurrent protection action function when any area is not selective, and repeat the judgment until all areas are selective at the same time.

11. A computer device comprising a memory, a processor, and a computer program stored in the memory and executable on the processor, characterized in that: When the processor executes the computer program, the steps of the method for analyzing the electrical protection selectivity zone according to any one of claims 1 to 9 are implemented.

12. A computer-readable storage medium storing a computer program, characterized in that: When the computer program is executed by a processor, the steps of analyzing the electrical protection selectivity zone according to any one of claims 1 to 9 are implemented.

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