CN104537465A - Determining method and device of setting current of power distribution network - Google Patents

Abstract

The invention discloses a determining method and device of a setting current of a power distribution network. The determining method comprises the steps of obtaining line parameter information of the power distribution network, obtaining total impedance of the power distribution network according to the line parameter information, obtaining the protection type and the power supply voltage grade of the power distribution network, determining a preset algorithm corresponding to the protection type and a voltage value corresponding to the power supply voltage grade, and determining the setting value of the setting current of the power distribution network according to the voltage value, the total impedance and the preset algorithm. The determining method and device of the setting current of the power distribution network solve the technical problem that as setting calculation needs to be carried out by people according to experience, efficiency is low in the prior art.

Description

Method and device for determining setting current of distribution network

technical field

The present invention relates to the field of power systems, in particular to a method and device for determining a set current of a distribution network.

Background technique

The distribution network is composed of overhead lines, cables, towers, distribution transformers, isolating switches, reactive power compensation capacitors, and some ancillary facilities. It plays an important role in distributing electric energy in the power network. The distribution network generally adopts closed-loop design and open-loop operation, and its structure is radial. In small and medium-sized cities and vast rural areas, the distribution network is mainly composed of overhead lines, which are characterized by a large number of lines, long lengths, and different types and parameters of lines.

At present, when calculating the set value of the set current of the distribution network, it is necessary to manually calculate the relevant parameters based on experience, resulting in a large workload and low efficiency.

For the above problems, no effective solution has been proposed yet.

Contents of the invention

Embodiments of the present invention provide a method and device for determining a set current of a distribution network, so as to at least solve the technical problem of low efficiency in the prior art that requires manual setting calculation based on experience.

According to an aspect of an embodiment of the present invention, a method for determining the set current of a distribution network is provided, including: obtaining line parameter information of the distribution network; obtaining the total impedance of the distribution network according to the above line parameter information; obtaining The above-mentioned protection type and power supply voltage level of the distribution network, and determine the preset algorithm corresponding to the above-mentioned protection type, and the voltage value corresponding to the above-mentioned power supply voltage level; according to the above-mentioned voltage value, the above-mentioned total impedance and the above-mentioned preset algorithm, determine The setting value of the setting current of the above-mentioned distribution network.

The above-mentioned line parameter information includes line type, line length and internal impedance of the power supply; wherein, the above-mentioned total impedance of the distribution network is obtained according to the above-mentioned line parameter information, including: determining the line impedance corresponding to the above-mentioned line model; according to the above-mentioned line impedance, The above-mentioned line length and the above-mentioned internal impedance of the power supply are used to obtain the total impedance of the above-mentioned distribution network.

The above-mentioned obtaining the total impedance of the distribution network according to the above-mentioned line impedance, the above-mentioned line length and the above-mentioned internal impedance of the power supply includes: summing the product of the above-mentioned line impedance and the above-mentioned line length and the above-mentioned internal impedance of the power supply to obtain the above-mentioned total impedance.

The above-mentioned determination of the setting value of the setting current of the distribution network according to the above-mentioned voltage value, the above-mentioned total impedance and the above-mentioned preset algorithm includes: determining the above-mentioned setting value through the following above-mentioned preset algorithm: the above-mentioned setting value = the above-mentioned voltage value / the above-mentioned total Impedance × preset coefficient.

After determining the setting value of the setting current of the distribution network according to the above-mentioned voltage value, the above-mentioned total impedance and the above-mentioned preset algorithm, it also includes: displaying the above-mentioned setting value; receiving the actual setting value input by the user according to the above-mentioned setting value; obtaining The above-mentioned load current of the distribution network; according to the above-mentioned load current and the preset sensitivity coefficient, the above-mentioned actual setting value is verified.

The acquisition of the load current of the distribution network includes: receiving the load power of the distribution network input by the user; dividing the load power by the voltage value to obtain the load current.

The above-mentioned verification of the above-mentioned actual setting value according to the above-mentioned load current and the preset sensitivity coefficient includes: if the above-mentioned actual setting value is greater than the product of the above-mentioned load current and the above-mentioned preset sensitivity coefficient, displaying the first verification result, Wherein, the above-mentioned first verification result indicates that the above-mentioned actual setting value is correct; if the above-mentioned actual setting value is less than or equal to the product of the above-mentioned load current and the above-mentioned preset sensitivity coefficient, the second verification result is displayed, wherein the above-mentioned second verification The result indicates that the above actual setting value is wrong.

According to another aspect of the embodiments of the present invention, there is also provided a device for determining a set current of a distribution network, including: a first acquisition unit, configured to acquire line parameter information of a distribution network; a first calculation unit, configured to According to the above-mentioned line parameter information, the total impedance of the above-mentioned distribution network is obtained; the second acquisition unit is used to obtain the protection type and power supply voltage level of the above-mentioned distribution network, and determine the preset algorithm corresponding to the above-mentioned protection type, and the above-mentioned The voltage value corresponding to the power supply voltage level; the second calculation unit is used to determine the setting value of the setting current of the distribution network according to the above voltage value, the above total impedance and the above preset algorithm.

The device for determining the set current of the distribution network further includes: a display unit for displaying the above set value; a receiving unit for receiving the actual set value input by the user according to the above set value; a third obtaining unit for obtaining the above set value The load current of the distribution network; the verification unit is used to verify the above actual setting value according to the above load current and the preset sensitivity coefficient.

The above verification unit is used to perform the following steps to verify the above actual setting value according to the above load current and the preset sensitivity coefficient: if the above actual setting value is greater than the product of the above load current and the above preset sensitivity coefficient, then Displaying the first verification result, wherein the first verification result indicates that the actual setting value is correct; if the actual setting value is less than or equal to the product of the load current and the preset sensitivity coefficient, the second verification result is displayed, Wherein, the above-mentioned second verification result indicates that the above-mentioned actual setting value is wrong.

In the embodiment of the present invention, by obtaining the line parameter information of the distribution network, according to the line parameter information, the total impedance of the distribution network is obtained, the protection type and the power supply voltage level of the distribution network are obtained, and the preset value corresponding to the protection type is determined. The setting algorithm, and the voltage value corresponding to the power supply voltage level, according to the voltage value, total impedance and preset algorithm, determine the setting value of the setting current of the distribution network, and achieve the purpose of automatically calculating the setting current of the distribution network, thereby realizing It improves the technical effect of determining the efficiency of setting current for different distribution networks, and further solves the technical problem of low efficiency caused by manual setting calculation based on experience in the prior art.

Description of drawings

The accompanying drawings described here are used to provide a further understanding of the present invention and constitute a part of the application. The schematic embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute improper limitations to the present invention. In the attached picture:

FIG. 1 is a schematic flowchart of an optional method for determining a set current of a distribution network according to an embodiment of the present invention;

Fig. 2 is a schematic flowchart of another optional method for determining a set current of a distribution network according to an embodiment of the present invention;

Fig. 3 is a schematic flowchart of another optional method for determining a set current of a distribution network according to an embodiment of the present invention;

Fig. 4 is a schematic structural diagram of an optional device for determining a set current of a distribution network according to an embodiment of the present invention;

Fig. 5 is a schematic structural diagram of an optional device for determining a set current of a distribution network according to an embodiment of the present invention.

Detailed ways

In order to enable those skilled in the art to better understand the solutions of the present invention, the following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only It is an embodiment of a part of the present invention, but not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without making creative efforts shall fall within the protection scope of the present invention.

It should be noted that the terms "first" and "second" in the description and claims of the present invention and the above drawings are used to distinguish similar objects, but not necessarily used to describe a specific sequence or sequence. It is to be understood that the data so used are interchangeable under appropriate circumstances such that the embodiments of the invention described herein can be practiced in sequences other than those illustrated or described herein. Furthermore, the terms "comprising" and "having", as well as any variations thereof, are intended to cover a non-exclusive inclusion, for example, a process, method, system, product or device comprising a sequence of steps or elements is not necessarily limited to the expressly listed instead, may include other steps or elements not explicitly listed or inherent to the process, method, product or apparatus.

Example 1

According to an embodiment of the present invention, a method for determining a set current of a distribution network is provided, as shown in FIG. 1 , the method includes:

S102. Obtain line parameter information of the distribution network;

S104. Obtain the total impedance of the distribution network according to the line parameter information;

S106. Obtain the protection type and power supply voltage level of the distribution network, and determine a preset algorithm corresponding to the protection type and a voltage value corresponding to the power supply voltage level;

S108. Determine a set value of a set current of the distribution network according to the voltage value, the total impedance, and a preset algorithm.

Optionally, in the embodiment of the present invention, the set current refers to a standard value compared with the time current when the relay protection judges to trip. The device for determining the set current of the distribution network can provide a human-computer interaction interface, and then, the staff of the power supply enterprise can input and obtain relevant information through the human-computer interaction interface.

Optionally, the line parameter information includes line type, line length and internal impedance of the power supply. Wherein, as shown in FIG. 2, obtaining the total impedance of the distribution network according to the line parameter information may include the following steps:

S202. Determine the line impedance corresponding to the line model;

S204. Obtain the total impedance of the distribution network according to the line impedance, the line length, and the internal impedance of the power supply.

It should be noted that the above-mentioned line parameter information may be input to the device for determining the set current of the distribution network by the staff of the power supply company through the above-mentioned human-computer interaction interface.

Wherein, the embodiment of the present invention may use an Access database, and the device for determining the set current of the distribution network may store the line impedance, line conductance, and line capacitance corresponding to different line types in the database. That is, the aforementioned determination of the line impedance corresponding to the line model may include searching the database for the line impedance corresponding to the line model.

Optionally, in the embodiment of the present invention, the total impedance of the distribution network may include the total impedance of the distribution network in a maximum operation mode and the total impedance in a minimum operation mode. Among them, the maximum operation mode refers to an operation mode in which the distribution network has the smallest short-circuit impedance value and the largest short-circuit current after a short-circuit occurs when the distribution network operates in this mode. The minimum operation mode refers to an operation mode in which the distribution network has the largest short-circuit impedance value and the short-circuit current is the smallest after a short-circuit occurs when the distribution network operates in this mode.

Optionally, obtaining the total impedance of the distribution network according to the line impedance, the line length and the internal impedance of the power supply includes: summing the product of the line impedance and the line length and the internal impedance of the power supply to obtain the total impedance. Right now,

Total impedance = line impedance × line length + internal impedance of the power supply.

Optionally, after obtaining the total impedance of the distribution network, the device for determining the set current of the distribution network can display the parameter setting result through the above-mentioned human-computer interaction interface, and the parameter setting result can include the total impedance and line parameter information , so that the staff can check it. After checking, the staff can click the "calculate" button in the human-computer interaction interface, and the device for determining the set current of the distribution network will calculate the set current.

Optionally, the protection type and voltage level of the distribution network can be input by the staff through the above-mentioned human-computer interaction interface, and the device for determining the set current of the distribution network can determine different preset algorithms according to different protection types. Types can include quick break protection and overcurrent protection. The staff can input one or more of them, and then the device for determining the set current of the distribution network can obtain different set values.

Optionally, determining the set value of the set current of the distribution network according to the voltage value, the total impedance and a preset algorithm includes: determining the set value through the following preset algorithm: set value=voltage value/total impedance×preset coefficient.

It should be noted that the preset coefficients in the preset algorithms corresponding to different protection types are different.

Optionally, as shown in Figure 3, after determining the set value of the set current of the distribution network according to the voltage value, the total impedance, and the preset algorithm, it also includes:

S302, displaying the setting value;

S304. Receive the actual setting value input by the user according to the setting value;

S306. Obtain the load current of the distribution network;

S308. Verify the actual setting value according to the load current and the preset sensitivity coefficient.

In the embodiment of the present invention, after determining the set value of the set current of the distribution network, the device for determining the set current of the distribution network can display the set value through the above-mentioned human-computer interaction interface, and the user can input the actual value according to the set value. setting value. Wherein, the user can select the actual setting value nearby according to the setting value. For example, the setting value calculated by the device for determining the setting current of the distribution network is "101A", then the user can input the actual setting value "100A" according to the nearest principle (or rounding principle).

After receiving the actual setting value input by the user according to the setting value, the device for determining the setting current of the distribution network may obtain the load current of the distribution network, wherein the method for obtaining the load current of the distribution network may include: receiving the user input The load power of the distribution network; divide the load power by the voltage value to get the load current. Right now,

Load current = load power/voltage value.

Wherein, the load power may refer to the power of devices such as air conditioners and refrigerators on the user side.

In the embodiment of the present invention, the device for determining the set current of the distribution network can check the actual set value input by the user, including displaying the first check if the actual set value is greater than the product of the load current and the preset sensitivity coefficient Results, wherein the first verification result indicates that the actual setting value is correct; if the actual setting value is less than or equal to the product of the load current and the preset sensitivity coefficient, the second verification result is displayed, wherein the second verification result indicates the actual setting Wrong value.

For example, if the actual setting value input by the staff is "100A", it means that when the current in the distribution network exceeds 100A, quick-break protection or over-current protection will be performed. If the load current is "40A" and the preset sensitivity coefficient is 2, then 100A>40A×2 means that the actual setting value is correct, and the first verification result is displayed, and the first verification result indicates that the actual setting value is correct. On the contrary, if the actual setting value is less than or equal to the product of the load current and the preset sensitivity coefficient, a second verification result is displayed, wherein the second verification result indicates that the actual setting value is wrong.

In an optional implementation manner, the method for determining the set current of the distribution network in the embodiment of the present invention may include:

1. The user enters the line parameter information through the human-computer interaction interface, including selecting the protection type, entering the line name, line model, line length, selecting the power supply voltage level, entering the internal impedance of the power supply, and entering the load impedance or load power. The device for determining the set current of the distribution network calculates the total impedance of the distribution network in the maximum operation mode and the total impedance in the minimum operation mode according to the above-mentioned line parameter information.

2. The device for determining the set current of the distribution network displays the parameter setting results, and the user checks the corresponding information and clicks the "calculate" button to start the calculation process.

3. The device for determining the setting current of the distribution network calculates the setting value of the quick-break protection and the setting value of the overcurrent protection in the maximum operation mode according to the preset algorithm corresponding to the protection type.

4. The user selects the actual setting value nearby according to the calculation result.

5. The device for determining the set current of the distribution network calls and displays the preset sensitivity coefficient from the database, so that the user can modify and confirm it.

6. The device for determining the set current of the distribution network is calculated according to the sensitivity verification algorithm. If the result is greater than the preset sensitivity coefficient, it means that the sensitivity is sufficient, and it is indicated by √. If the result is less than the preset sensitivity coefficient, it means that the sensitivity is insufficient. Need Reset and calculation, indicated by ×.

It should be noted that the sensitivity coefficient=actual setting value/load current. Here, the sensitivity coefficient can also be calculated and compared with the preset sensitivity coefficient to determine whether the actual setting value is correct, which is not limited in the embodiment of the present invention.

7. Output and print calculation results. At the same time, the device for determining the set current of the distribution network stores the calculation results in the database, which is convenient for calling and querying in the future.

In the embodiment of the present invention, by obtaining the line parameter information of the distribution network, according to the line parameter information, the total impedance of the distribution network is obtained, the protection type and the power supply voltage level of the distribution network are obtained, and the preset value corresponding to the protection type is determined. The setting algorithm, and the voltage value corresponding to the power supply voltage level, according to the voltage value, total impedance and preset algorithm, determine the setting value of the setting current of the distribution network, and achieve the purpose of automatically calculating the setting current of the distribution network, thereby realizing The technical effect of improving the efficiency of determining the set current for different distribution networks is obtained. That is to say, due to the strong repetition of the setting work of the distribution network, the amount of calculation is large, the labor cost is high, and the efficiency is low. Therefore, the method for determining the set current of the distribution network provided by the embodiment of the present invention can improve work efficiency, reduce work error rate, and benefit the safety of power grid operation.

It should be noted that for the foregoing method embodiments, for the sake of simple description, they are expressed as a series of action combinations, but those skilled in the art should know that the present invention is not limited by the described action sequence. Because of the present invention, certain steps may be performed in other orders or simultaneously. Secondly, those skilled in the art should also know that the embodiments described in the specification belong to preferred embodiments, and the actions and modules involved are not necessarily required by the present invention.

Through the description of the above embodiments, those skilled in the art can clearly understand that the method according to the above embodiments can be implemented by means of software plus a necessary general-purpose hardware platform, and of course also by hardware, but in many cases the former is better implementation. Based on such an understanding, the essence of the technical solution of the present invention or the part that contributes to the prior art can be embodied in the form of software products, and the computer software products are stored in a storage medium (such as ROM/RAM, disk, CD) contains several instructions to make a terminal device (which may be a mobile phone, a computer, a server, or a network device, etc.) execute the method of each embodiment of the present invention.

Example 2

According to an embodiment of the present invention, there is also provided a device for determining a set current of a distribution network for implementing the method for determining a set current of a distribution network, as shown in FIG. 4 , the device includes:

The first acquiring unit 402 is configured to acquire line parameter information of the distribution network;

The first calculation unit 404 is configured to obtain the total impedance of the distribution network according to the line parameter information;

The second acquiring unit 406 is configured to acquire the protection type and power supply voltage level of the distribution network, and determine a preset algorithm corresponding to the protection type and a voltage value corresponding to the power supply voltage level;

The second calculation unit 408 is configured to determine the set value of the set current of the distribution network according to the voltage value, the total impedance and the preset algorithm.

Optionally, in the embodiment of the present invention, the device for determining the set current of the distribution network can provide a human-computer interaction interface, then, the staff of the power supply enterprise can input and obtain relevant information through the human-computer interaction interface.

Optionally, in the embodiment of the present invention, the total impedance of the distribution network may include the total impedance of the distribution network in a maximum operation mode and the total impedance in a minimum operation mode. Among them, the maximum operation mode refers to an operation mode in which the distribution network has the smallest short-circuit impedance value and the largest short-circuit current after a short-circuit occurs when the distribution network operates in this mode. The minimum operation mode refers to an operation mode in which the distribution network has the largest short-circuit impedance value and the short-circuit current is the smallest after a short-circuit occurs when the distribution network operates in this mode.

Optionally, the obtaining the total impedance of the distribution network according to the line impedance, the line length, and the internal impedance of the power supply includes: multiplying the product of the line impedance and the line length by the The internal impedances of the power supplies are summed to obtain the total impedance. Right now,

Total impedance = line impedance × line length + internal impedance of the power supply.

Optionally, after obtaining the total impedance of the distribution network, the device for determining the set current of the distribution network can display the parameter setting result through the above-mentioned human-computer interaction interface, and the parameter setting result can include the total impedance and the line Parameter information for staff to check. After checking, the staff can click the "calculate" button in the human-computer interaction interface, and the device for determining the set current of the distribution network will calculate the set current.

Optionally, as shown in Figure 5, the device for determining the set current of the distribution network further includes:

a display unit 502, configured to display the setting value;

a receiving unit 504, configured to receive the actual setting value input by the user according to the setting value;

A third obtaining unit 506, configured to obtain the load current of the distribution network;

The verification unit 508 is configured to verify the actual setting value according to the load current and the preset sensitivity coefficient.

In the embodiment of the present invention, after determining the set value of the set current of the distribution network, the device for determining the set current of the distribution network can display the set value through the above-mentioned human-computer interaction interface, and the user can input the actual value according to the set value. setting value. Wherein, the user can select the actual setting value nearby according to the setting value. For example, the setting value calculated by the device for determining the setting current of the distribution network is "101A", then the user can input the actual setting value "100A" according to the nearest principle (or rounding principle).

After receiving the actual setting value input by the user according to the setting value, the device for determining the setting current of the distribution network can obtain the load current of the distribution network, wherein the method for obtaining the load current of the distribution network can be The method includes: receiving the load power of the distribution network input by the user; dividing the load power by the voltage value to obtain the load current. Right now,

Load current = load power/voltage value.

Wherein, the load power may refer to the power of devices such as air conditioners and refrigerators on the user side.

In the embodiment of the present invention, the device for determining the set current of the distribution network can verify the actual set value input by the user, including if the actual set value is greater than the product of the load current and the preset sensitivity coefficient, Then display the first verification result, wherein the first verification result indicates that the actual setting value is correct; if the actual setting value is less than or equal to the product of the load current and the preset sensitivity coefficient, then display A second verification result, wherein the second verification result indicates that the actual setting value is wrong.

For example, if the actual setting value input by the staff is "100A", it means that when the current in the distribution network exceeds 100A, quick-break protection or over-current protection will be performed. If the load current is "40A" and the preset sensitivity coefficient is 2, then 100A>40A×2 means that the actual setting value is correct, and the first verification result will be displayed, and the first verification result indicates the actual setting value correct. Conversely, if the actual setting value is less than or equal to the product of the load current and the preset sensitivity coefficient, a second verification result is displayed, wherein the second verification result indicates that the actual setting value is wrong .

Optionally, the verification unit is configured to perform the following steps to verify the actual setting value according to the load current and a preset sensitivity coefficient:

If the actual setting value is greater than the product of the load current and the preset sensitivity coefficient, a first verification result is displayed, wherein the first verification result indicates that the actual setting value is correct;

If the actual setting value is less than or equal to the product of the load current and the preset sensitivity coefficient, a second verification result is displayed, wherein the second verification result indicates that the actual setting value is wrong.

In the embodiment of the present invention, by obtaining the line parameter information of the distribution network, according to the line parameter information, the total impedance of the distribution network is obtained, the protection type and the power supply voltage level of the distribution network are obtained, and the preset value corresponding to the protection type is determined. The setting algorithm, and the voltage value corresponding to the power supply voltage level, according to the voltage value, total impedance and preset algorithm, determine the setting value of the setting current of the distribution network, and achieve the purpose of automatically calculating the setting current of the distribution network, thereby realizing The technical effect of improving the efficiency of determining the set current for different distribution networks is obtained. That is to say, due to the strong repetition of the setting work of the distribution network, the amount of calculation is large, the labor cost is high, and the efficiency is low. Therefore, the method for determining the set current of the distribution network provided by the embodiment of the present invention can improve work efficiency, reduce work error rate, and benefit the safety of power grid operation.

The serial numbers of the above embodiments of the present invention are for description only, and do not represent the advantages and disadvantages of the embodiments.

If the integrated units in the above embodiments are realized in the form of software function units and sold or used as independent products, they can be stored in the above computer-readable storage medium. Based on this understanding, the essence of the technical solution of the present invention or the part that contributes to the prior art or all or part of the technical solution can be embodied in the form of a software product, and the computer software product is stored in a storage medium. Several instructions are included to make one or more computer devices (which may be personal computers, servers or network devices, etc.) execute all or part of the steps of the methods described in the various embodiments of the present invention.

In the above-mentioned embodiments of the present invention, the descriptions of each embodiment have their own emphases, and for parts not described in detail in a certain embodiment, reference may be made to relevant descriptions of other embodiments.

In the several embodiments provided in this application, it should be understood that the disclosed client can be implemented in other ways. Wherein, the device embodiments described above are only illustrative, for example, the division of the units is only a logical function division, and there may be other division methods in actual implementation, for example, multiple units or components can be combined or can be Integrate into another system, or some features may be ignored, or not implemented. In another point, the mutual coupling or direct coupling or communication connection shown or discussed may be through some interfaces, and the indirect coupling or communication connection of units or modules may be in electrical or other forms.

The units described as separate components may or may not be physically separated, and the components shown as units may or may not be physical units, that is, they may be located in one place, or may be distributed to multiple network units. Part or all of the units can be selected according to actual needs to achieve the purpose of the solution of this embodiment.

In addition, each functional unit in each embodiment of the present invention may be integrated into one processing unit, each unit may exist separately physically, or two or more units may be integrated into one unit. The above-mentioned integrated units can be implemented in the form of hardware or in the form of software functional units.

The above is only a preferred embodiment of the present invention, it should be pointed out that, for those of ordinary skill in the art, without departing from the principle of the present invention, some improvements and modifications can also be made, and these improvements and modifications can also be made. It should be regarded as the protection scope of the present invention.

Claims (10)

1. A method for determining a set current of a distribution network, comprising: Obtain line parameter information of the distribution network; Obtaining the total impedance of the distribution network according to the line parameter information; Obtain the protection type and power supply voltage level of the distribution network, and determine a preset algorithm corresponding to the protection type and a voltage value corresponding to the power supply voltage level; A set value of the set current of the distribution network is determined according to the voltage value, the total impedance, and the preset algorithm. 2. The method according to claim 1, wherein the line parameter information includes line type, line length and internal impedance of the power supply; Wherein, the obtaining the total impedance of the distribution network according to the line parameter information includes: determining the line impedance corresponding to the line type; The total impedance of the distribution network is obtained according to the line impedance, the line length, and the internal impedance of the power supply. 3. The method according to claim 2, wherein the obtaining the total impedance of the distribution network according to the line impedance, the line length, and the internal impedance of the power supply includes: summing the product of the line impedance and the line length and the internal impedance of the power supply to obtain the total impedance. 4. The method according to any one of claims 1 to 3, wherein the determination of the set current of the distribution network according to the voltage value, the total impedance and the preset algorithm Settings, including: The setting is determined by a preset algorithm as described below: The setting value=the voltage value/the total impedance×a preset coefficient. 5. The method according to claim 1, characterized in that, after determining the setting value of the setting current of the distribution network according to the voltage value, the total impedance and the preset algorithm, further include: display said setting; receiving the actual setting value input by the user according to the setting value; obtaining the load current of the distribution network; The actual setting value is verified according to the load current and the preset sensitivity coefficient. 6. The method according to claim 5, wherein the obtaining the load current of the distribution network comprises: receiving the load power of the distribution network input by the user; The load current is obtained by dividing the load power by the voltage value. 7. The method according to claim 5 or 6, wherein the verification of the actual setting value according to the load current and the preset sensitivity coefficient includes: If the actual setting value is greater than the product of the load current and the preset sensitivity coefficient, a first verification result is displayed, wherein the first verification result indicates that the actual setting value is correct; If the actual setting value is less than or equal to the product of the load current and the preset sensitivity coefficient, a second verification result is displayed, wherein the second verification result indicates that the actual setting value is wrong. 8. A device for determining a set current of a distribution network, comprising: a first acquisition unit, configured to acquire line parameter information of the distribution network; a first calculation unit, configured to obtain the total impedance of the distribution network according to the line parameter information; A second acquisition unit, configured to acquire the protection type and power supply voltage level of the distribution network, and determine a preset algorithm corresponding to the protection type and a voltage value corresponding to the power supply voltage level; The second calculation unit is configured to determine the set value of the set current of the distribution network according to the voltage value, the total impedance, and the preset algorithm. 9. The device according to claim 8, further comprising: a display unit for displaying the set value; a receiving unit, configured to receive the actual setting value input by the user according to the setting value; a third obtaining unit, configured to obtain the load current of the distribution network; The verification unit is configured to verify the actual setting value according to the load current and the preset sensitivity coefficient. 10. The device according to claim 9, wherein the verification unit is configured to perform the following steps to verify the actual setting value according to the load current and a preset sensitivity coefficient: If the actual setting value is greater than the product of the load current and the preset sensitivity coefficient, a first verification result is displayed, wherein the first verification result indicates that the actual setting value is correct; If the actual setting value is less than or equal to the product of the load current and the preset sensitivity coefficient, a second verification result is displayed, wherein the second verification result indicates that the actual setting value is wrong.