Distribution line short-circuit fault processing system based on panoramic information

Abstract

The invention provides a distribution line short-circuit fault processing system based on panoramic information. The distribution line short-circuit fault processing system based on panoramic information comprises a plurality of groups of fault processing assemblies which are respectively arranged at a plurality of measuring points of a distribution line, and each fault processing assembly comprises a measuring device, a controller and a circuit breaker. According to the distribution line short-circuit fault processing system based on panoramic information, the requirements of rapid power supply recovery of instantaneous faults and accurate isolation of permanent faults can be met.

Description

Technical Field

[0001] The present application relates to the technical field of power systems, and in particular to a distribution line short-circuit fault handling system based on panoramic information. Background Art

[0002] Distribution networks can be divided into overhead distribution networks, cable distribution networks, and mixed overhead and cable distribution networks based on the type of distribution lines. Overhead distribution line short-circuit faults can occur in two ways: transient faults and permanent faults.

[0003] In related technologies, when it is detected that the section to be tested is a fault section, no distinction is made between a transient fault and a permanent fault in the fault section, and the switches on both sides of the fault section are directly tripped, which cannot meet the needs of rapid power restoration in transient faults and precise isolation of permanent faults. Summary of the Invention

[0004] This application aims to solve one of the technical problems existing in the prior art or related technologies.

[0005] To this end, this application proposes a distribution line short circuit fault handling system based on panoramic information.

[0006] In view of this, according to the present application, a distribution line short circuit fault processing system based on panoramic information is proposed, which is applied to the distribution line. The distribution line short circuit fault processing system based on panoramic information includes: Multiple fault handling components are respectively arranged at multiple measuring points of the distribution line, each fault handling component includes a measuring device, a controller and a circuit breaker; A first fault processing component is provided at a first measuring point, and the first fault processing component includes a first measuring device, a first controller and a first circuit breaker; The first measuring device is used to collect a first current measurement value and a first voltage measurement value at a first measurement point; The first controller is connected to the first measuring device and the first circuit breaker. The first controller is used to determine the effective value of the first current based on the first current measurement value. When the effective value of the first current is greater than the current threshold and exceeds the first time length, the first measurement point is determined to be the power supply side measurement point, and the power supply side measurement point is located on the power supply side of the fault point; the first circuit breaker is controlled to be disconnected and delayed for a second time length, and the first circuit breaker is controlled to be reclosed. The first circuit breaker is located at the power supply side measurement point of the fault section; after the first circuit breaker is reclosed, when it is determined whether the effective value of the first current is less than or equal to the current threshold, the fault type is determined to be a transient fault; when the effective value of the first current is greater than the current threshold after the first circuit breaker is reclosed, the fault type is determined to be a permanent fault; if the fault type is a permanent fault, the first circuit breaker is controlled to be disconnected.

[0007] A second fault processing component is provided at a second measuring point, the second fault processing component including a second measuring device, a second controller and a second circuit breaker; The second measuring device is used to collect a second current measurement value and a second voltage measurement value at a second measurement point; The second controller is connected to the second measuring device and the second circuit breaker. The second controller is used to determine the second current effective value according to the second current measurement value, and to determine the second voltage effective value according to the second voltage measurement value; when the second current effective value is not greater than the current threshold and the second voltage effective value is less than the voltage threshold, the second measurement point is determined to be the load side measurement point, and the load side measurement point is located on the load side of the fault point; when the second controller detects that the second voltage effective value is less than the voltage threshold, it starts timing until the three-phase voltage disappears, thereby obtaining a third time length; the second controller detects the second voltage effective value. If the third time period is within the preset time window, the current measurement point is determined to be the load-side measurement point of the fault section; after determining that the current measurement point is the load-side measurement point of the fault section, the second controller detects whether three-phase voltage loss is detected again after the fourth time period. The fourth time period is the sum of the reclosing action time and the re-disconnection time of the first circuit breaker of the power supply side measurement point. If three-phase voltage loss is detected after the fourth time period, the fault type is determined to be a permanent fault; if the second controller determines that the fault type is a permanent fault, it controls the second circuit breaker to disconnect. The second circuit breaker is the load-side circuit breaker of the fault section.

[0008] In this technical solution, multiple measurement points are set up on the distribution line, dividing the distribution line into multiple sections to be measured. Each measurement point on the distribution line is equipped with a measurement device, a circuit breaker, and a controller. The measurement device at each measurement point is connected to the corresponding controller. The measurement device can transmit the collected current and voltage measurement values ​​to the controller, which calculates the corresponding effective current and voltage values ​​based on the current and voltage measurement values. The circuit breaker is connected to the controller and is controlled by the controller. The controller can control the on and off state of the circuit breaker based on the effective current and voltage values.

[0009] It should be noted that the panoramic information includes a variety of information on the distribution line, including: voltage information, current information, and information at each switch on the distribution line.

[0010] The distribution line short-circuit fault processing system based on panoramic information includes controllers, circuit breakers and measuring devices at multiple measuring points.

[0011] The following describes the working process of the first measuring device, the first controller, and the first circuit breaker located at the first measuring point: The first measuring device collects a first current measurement value and a first voltage measurement value at a first measurement point, and transmits the first current measurement value and the first voltage measurement value to a first controller. The first controller calculates a first current effective value based on the first current measurement value, and calculates a first voltage effective value based on the first voltage measurement value. The first controller compares the numerical relationship between the first current effective value and a current threshold value. If the first current effective value is greater than the current threshold value and persists for a period exceeding a first duration, the first measurement point is determined to be located on the power supply side of the fault section, i.e., the first measurement point is a measurement point on the power supply side of the fault section.

[0012] The first circuit breaker is controlled by the first controller. When the first controller detects that the first measurement point is located on the power supply side of the fault section, the first controller controls the first circuit breaker to operate and disconnect the first circuit breaker. After controlling the first circuit breaker to disconnect for a second period of time, the first controller controls the first circuit breaker to reclose.

[0013] The first controller is capable of analyzing and determining the fault type. After the first circuit breaker recloses, the first controller obtains the current effective value of the first current and compares the numerical relationship between the first effective value of the current and the current threshold. If the comparison result shows that the effective value of the first current is less than or equal to the current threshold, the fault at the fault point is determined to have been cleared, and the fault type of the fault point is determined to be a transient fault. If the comparison result shows that the effective value of the first current is greater than the current threshold, the fault at the fault point is determined to still exist, and the fault type of the fault point is determined to be a permanent fault.

[0014] When it is detected that the fault type is a permanent fault, it is necessary to isolate the fault section where the fault point is located. At this time, the first controller controls the first circuit breaker to be opened again after reclosing.

[0015] The following describes the working process of the second measuring device, the second controller, and the second circuit breaker located at the second measuring point: The second measuring device collects a second current measurement value and a second voltage measurement value at a second measurement point, and transmits the second current measurement value and the second voltage measurement value to a second controller. The second controller calculates a second current effective value based on the second current measurement value and a second voltage effective value based on the second voltage measurement value. The second controller is capable of comparing the numerical relationship between the second current effective value and the current threshold, and comparing the numerical relationship between the second voltage effective value and the voltage threshold.

[0016] When the second current effective value is not greater than the current threshold and the second voltage effective value is less than the voltage threshold, it is determined that the second measurement point is located on the load side of the fault point.

[0017] When the second controller detects that the second voltage effective value is less than the voltage threshold, it uses the moment when the second voltage effective value is less than the voltage threshold as the starting point of timing and the moment when the three-phase voltage disappears as the ending point of timing. The second controller then determines whether the third time duration is within a preset time window. If the third time duration is within the preset time window, the second measurement point is determined to be the load-side measurement point of the fault section.

[0018] After the second controller detects that the second measurement point is the load-side measurement point of the faulty section, it begins timing. After the fourth duration is reached, it determines whether a three-phase voltage loss is detected again. If a three-phase voltage loss is detected again, it is determined that the first circuit breaker on the power supply side of the faulty section has been opened again, and the fault type is determined to be a permanent fault. It should be noted that the fourth duration is the sum of the reclosing operation time and the re-opening time of the power supply-side measurement point. Therefore, if a three-phase voltage loss is detected again after the fourth duration is reached, it is determined that the first circuit breaker at the power supply-side measurement point has been opened again after reclosing.

[0019] The second circuit breaker is controlled by a second controller. If the second controller determines that the second measurement point is the load-side measurement point of the faulty section and the fault type in the faulty section is a permanent fault, it controls the second circuit breaker at the second measurement point to open. Because the first circuit breaker at the first measurement point opens again after reclosing, the second circuit breaker is controlled to open by the second controller. At this point, both the first and second circuit breakers are in the open state, isolating the faulty section experiencing the permanent fault.

[0020] In the technical solution of the present application, the fault handling component includes a measuring device, a controller, and a circuit breaker. The measuring device is capable of collecting current and voltage measurement values ​​at each measurement point, and the controller is capable of determining the effective current value and the effective voltage value based on the current and voltage measurement values ​​collected by the measuring device. The controller is also capable of locating the power supply side measurement point of the fault section based on the duration of time that the effective current value is greater than the current threshold, and controlling the first circuit breaker at the power supply side measurement point to disconnect and then delay reclosing for a first time period. If the fault in the fault section disappears after reclosing, the fault is determined to be a transient fault, and power supply to the fault section has been restored at this time. If the fault in the fault section still exists after reclosing, the fault type is determined to be a permanent fault, and at this time, the first circuit breaker is quickly disconnected again. When it is detected that the effective value of the voltage is less than the voltage threshold, the measurement point is determined to be on the load side of the fault point, and the timing is started until the first three-phase voltage loss is detected. When the third time duration obtained by timing is within the preset time window, the measurement point is determined to be the load side measurement point of the fault section, and the positioning of the load side measurement point of the fault section is completed. When it is detected that the three-phase voltage loss occurs again within the fourth time duration, the fault section is determined to be a permanent fault. At this time, the second circuit breaker at the load side measurement point of the fault section is controlled to disconnect again to isolate the permanent fault. The distribution line short-circuit fault processing system based on panoramic information in this application can meet the needs of rapid power restoration of transient faults and precise isolation of permanent faults.

[0021] In some technical solutions, optionally, the preset time window is the sum of the first duration and the action duration of the first circuit breaker.

[0022] In the technical solution of the present application, since the first circuit breaker is controlled to disconnect after the effective current value is detected to be continuously greater than the current threshold value for more than the first time period at the power supply side measurement point, the load side measurement point of the fault section will detect the three-phase voltage loss at the load side measurement point after the first time period after detecting that the effective voltage value is less than the voltage threshold value plus the action time period of the first circuit breaker. Therefore, the preset time window is set to the sum of the first time period and the action time period of the first circuit breaker, and whether the measurement point is the load side measurement point of the fault section can be detected based on whether the third time period is within the preset time period window.

[0023] In the technical solution of the present application, by setting the preset time window to the sum of the first time length and the opening time window of the first circuit breaker, it is possible to ensure that the complete opening information of the power side circuit breaker can be obtained within the judgment time limit, thereby further improving the accuracy of short-circuit fault judgment.

[0024] In some technical solutions, optionally, multiple measurement points correspond to multiple first time lengths, and the first time lengths corresponding to the measurement points close to the end of the power supply increase step by step to the measurement points close to the beginning of the power supply.

[0025] In this technical solution, multiple measurement points are set in the power distribution line, and a corresponding first duration is set for each measurement point. The first duration is set in a step-by-step manner from the end of the power supply to the beginning of the power supply. Therefore, the first duration corresponding to the measurement point near the end of the power supply increases step-by-step from the measurement point near the beginning of the power supply.

[0026] In the present technical solution, since the distance between each measurement point and the power supply is different, the first time length corresponding to each measurement point is set based on the positional relationship between the measurement point and the power supply, thereby improving the accuracy of the power supply side measurement point positioning to determine whether the measurement point is in the fault section.

[0027] In some technical solutions, optionally, the current threshold value ranges from 1.1 times to 1.3 times the maximum load current value of the distribution line, and the voltage threshold value ranges from 0.6 times to 0.8 times the rated voltage value of the distribution line.

[0028] In some technical solutions, optionally, the measurement point is located on a pole outside the substation.

[0029] Additional aspects and advantages of the present application will become apparent in the following description or may be learned through practice of the present application. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] The above and / or additional aspects and advantages of the present application will become apparent and easily understood from the description of the embodiments in conjunction with the following drawings, in which: Figure 1 One of the schematic diagrams of a distribution line short circuit fault processing system based on panoramic information provided in some embodiments of the present application is shown; Figure 2 A second schematic diagram of a power distribution line short circuit fault processing system based on panoramic information provided in some embodiments of the present application is shown; Figure 3 A third schematic diagram of a power distribution line short circuit fault processing system based on panoramic information provided in some embodiments of the present application is shown; Figure 4 One of the switch timing diagrams of a transient fault in some embodiments of the present application is shown; Figure 5 One of the switch timing diagrams of a permanent fault in some embodiments of the present application is shown; Figure 6 The second switching timing diagram of a transient fault in some embodiments of the present application is shown; Figure 7 The second switching timing diagram of a permanent fault in some embodiments of the present application is shown; Figure 8A schematic diagram showing the on-off state of a switch in some embodiments of the present application is shown; Figure 9 A schematic diagram of the on-off state of a switch with a permanent fault in some embodiments of the present application is shown.

[0031] Figure 1 and Figure 2 The reference numerals are as follows: 100 Distribution line short-circuit fault handling system based on panoramic information, 110 Fault handling component, 1102 First fault handling component, 1104 Second fault handling component, 112 Measuring device, 1122 First measuring device, 1124 Second measuring device, 114 Controller, 1142 First controller, 1144 Second controller, 116 Circuit breaker, 1162 First circuit breaker, 1164 Second circuit breaker, 200 Distribution line, 210 Measuring point, 211 First measuring point, 212 Second measuring point, 220 Fault section. DETAILED DESCRIPTION

[0032] In order to more clearly understand the above-mentioned objectives, features and advantages of the present application, the present application is further described in detail below in conjunction with the accompanying drawings and specific embodiments. It should be noted that, in the absence of conflict, the features of this embodiment and the embodiments can be combined with each other.

[0033] In the following description, many specific details are set forth to facilitate a full understanding of the present application. However, the present application may also be implemented in other ways different from those described herein. Therefore, the scope of protection of the present application is not limited to the specific embodiments disclosed below.

[0034] Refer to the following Figures 1 to 9 A distribution line short circuit fault processing system based on panoramic information according to some embodiments of the present application is described.

[0035] According to one embodiment of the present application, Figure 1 One of the schematic diagrams of a distribution line short circuit fault processing system based on panoramic information provided in some embodiments of the present application is shown. Figure 2 FIG2 shows a schematic diagram of a power distribution line short circuit fault processing system based on panoramic information provided in some embodiments of the present application. Figure 1 and Figure 2 As shown, a distribution line short circuit fault processing system 100 based on panoramic information is proposed, which is applied to a distribution line 200. The distribution line short circuit fault processing system 100 based on panoramic information includes: Multiple fault processing components 110 are respectively arranged at multiple measuring points 210 of the power distribution line 200 , and each fault processing component 110 includes a measuring device 112 , a controller 114 and a circuit breaker 116 ; The first fault processing component 1102 is disposed at the first measurement point 211 , and includes a first measuring device 1122 , a first controller 1142 , and a first circuit breaker 1162 ; The first measuring device 1122 is used to collect a first current measurement value and a first voltage measurement value at the first measuring point 211; The first controller 1142 is connected to the first measuring device 1122 and the first circuit breaker 1162. The first controller 1142 is configured to determine a first current effective value based on the first current measurement value. When the first current effective value is greater than a current threshold and exceeds a first duration, the first measurement point 211 is determined to be a power-side measurement point, which is located on the power-side side of the fault point. The first controller 1142 controls the first circuit breaker 1162 to open and delay for a second duration, and controls the first circuit breaker 1162 to reclose. The first circuit breaker 1162 is located at the power-side measurement point of the fault section 220. After the first circuit breaker 1162 is reclosed, if it is determined whether the first current effective value is less than or equal to the current threshold, the fault type is determined to be a transient fault. If the first current effective value is greater than the current threshold after the first circuit breaker 1162 is reclosed, the fault type is determined to be a permanent fault. If the fault type is a permanent fault, the first circuit breaker 1162 is controlled to open.

[0036] The second fault processing component 1104 is disposed at the second measurement point 212 , and the second fault processing component 1104 includes a second measuring device 1124 , a second controller 1144 , and a second circuit breaker 1164 ; The second measuring device 1124 is used to collect the second current measurement value and the second voltage measurement value at the second measuring point 212; The second controller 1144 is connected to the second measuring device 1124 and the second circuit breaker 1164. The second controller 1144 is used to determine the second current effective value based on the second current measurement value, and to determine the second voltage effective value based on the second voltage measurement value; when the second current effective value is not greater than the current threshold and the second voltage effective value is less than the voltage threshold, the second measuring point 212 is determined to be a load-side measuring point, and the load-side measuring point is located on the load side of the fault point; when the second controller 1144 detects that the second voltage effective value is less than the voltage threshold, it starts timing until the three-phase voltage disappears, thereby obtaining a third time length; the second controller 1144 detects that the third time length is within the predetermined time length. Assume that within the time window, the current measurement point 210 is determined to be the load-side measurement point of the fault section 220; after the second controller 1144 determines that the current measurement point 210 is the load-side measurement point of the fault section 220, it detects whether the three-phase voltage loss is detected again after the fourth time period. The fourth time period is the sum of the reclosing action time and the re-disconnection time of the first circuit breaker 1162 at the power supply side measurement point. If the three-phase voltage loss is detected after the fourth time period, the fault type is determined to be a permanent fault; when the second controller 1144 determines that the fault type is a permanent fault, it controls the second circuit breaker 1164 to disconnect. The second circuit breaker 1164 is the load-side circuit breaker 116 of the fault section 220.

[0037] In this embodiment, multiple measurement points 210 are provided on the distribution line 200, dividing the distribution line 200 into multiple sections to be measured. Each measurement point 210 on the distribution line 200 is equipped with a measurement device 112, a circuit breaker 116, and a controller 114. The measurement device 112 at each measurement point 210 is connected to the corresponding controller 114. The measurement device 112 is capable of transmitting the collected current and voltage measurement values ​​to the controller 114. The controller 114 calculates the corresponding effective current value and effective voltage value based on the current and voltage measurement values. The circuit breaker 116 is connected to the controller 114 and is controlled by the controller 114. The controller 114 is capable of controlling the on / off state of the circuit breaker 116 based on the effective current value and effective voltage value.

[0038] It should be noted that the panoramic information includes a variety of information on the distribution line, including: voltage information, current information, and information at each switch on the distribution line.

[0039] The distribution line short-circuit fault processing system based on panoramic information includes a controller 114 , a circuit breaker 116 , and a measuring device 112 at multiple measuring points 210 .

[0040] The following describes the working process of the first measuring device 1122, the first controller 1142, and the first circuit breaker 1162 located at the first measuring point 211: First measuring device 1122 collects a first current measurement value and a first voltage measurement value at first measurement point 211 and transmits the first current measurement value and the first voltage measurement value to first controller 1142. First controller 1142 calculates a first current effective value based on the first current measurement value and a first voltage effective value based on the first voltage measurement value. First controller 1142 compares the numerical relationship between the first current effective value and a current threshold value. If the first current effective value is greater than the current threshold value and persists for a period exceeding a first duration, first controller 1142 determines that first measurement point 211 is located on the power supply side of fault section 220, i.e., first measurement point 211 is a measurement point on the power supply side of fault section 220.

[0041] For example, the following relation (1) is used as a criterion for determining whether the first controller 1142 starts timing: ; (1) in, 、 、 is the effective value of the first current, is the current threshold, which is the current setting value obtained through adjustment.

[0042] When detecting that the first current effective value is greater than the current threshold, the first controller 1142 starts timing. After the current effective value is greater than the current threshold for a period exceeding a first time, the first measurement point 211 is determined to be located at the power supply side of the fault section 220 .

[0043] The first circuit breaker 1162 is controlled by the first controller 1142. When the first controller 1142 detects that the first measurement point 211 is located on the power supply side of the fault section 220, the first controller 1142 controls the first circuit breaker 1162 to operate, so that the first circuit breaker 1162 is disconnected. After controlling the first circuit breaker 1162 to be disconnected for a second period of time, the first circuit breaker 1162 is controlled to reclose.

[0044] The first controller 1142 is capable of analyzing and determining the type of fault. After the first circuit breaker 1162 recloses, the first controller 1142 obtains the current effective value of the first current and compares the numerical relationship between the first effective value of the current and the current threshold. If the comparison result shows that the effective value of the first current is less than or equal to the current threshold, the fault at the fault point is determined to have been cleared, and the fault type of the fault point is determined to be a transient fault. If the comparison result shows that the effective value of the first current is greater than the current threshold, the fault at the fault point is determined to still exist, and the fault type of the fault point is determined to be a permanent fault.

[0045] When it is detected that the fault type is a permanent fault, it is necessary to isolate the fault section 220 where the fault point is located. At this time, the first controller 1142 controls the first circuit breaker 1162 to open again after reclosing.

[0046] The following describes the working process of the second measuring device 1124, the second controller 1144, and the second circuit breaker 1164 located at the second measuring point 212: The second measuring device 1124 collects the second current measurement value and the second voltage measurement value at the second measuring point 212 and transmits the second current measurement value and the second voltage measurement value to the second controller 1144. The second controller 1144 calculates a second current effective value based on the second current measurement value and a second voltage effective value based on the second voltage measurement value. The second controller 1144 can compare the numerical relationship between the second current effective value and the current threshold, and the numerical relationship between the second voltage effective value and the voltage threshold.

[0047] When the second current effective value is not greater than the current threshold and the second voltage effective value is less than the voltage threshold, it is determined that the second measurement point 212 is located on the load side of the fault point.

[0048] For example, when the effective voltage value satisfies the following relation (2), it is determined that the second measurement point 212 is located on the load side of the fault point: ; (2) in, 、 、 is the effective value of the second voltage, is the voltage threshold, which is the voltage setting value obtained through adjustment.

[0049] When the second controller 1144 detects that the second voltage effective value is less than the voltage threshold, it uses the time when the second voltage effective value is less than the voltage threshold as the starting point and the time when the three-phase voltage disappears as the ending point. The third duration is obtained by timing, and the second controller 1144 determines whether the third duration is within a preset time window. If the third duration is within the preset time window, the second measurement point 212 is determined to be the load-side measurement point of the fault section 220.

[0050] After second controller 1144 detects that second measurement point 212 is the load-side measurement point of fault section 220, it begins timing. After the fourth time period has elapsed, it determines whether a three-phase voltage loss has been detected again. If a three-phase voltage loss is detected again, it is determined that first circuit breaker 1162 on the power supply side of fault section 220 has been opened again, and the fault type is determined to be a permanent fault. It should be noted that the fourth time period is the sum of the reclosing operation time and the re-opening time of the power supply-side measurement point. Therefore, if a three-phase voltage loss is detected again after the fourth time period has elapsed, it is determined that first circuit breaker 1162 at the power supply-side measurement point has been opened again after reclosing.

[0051] Second circuit breaker 1164 is controlled by second controller 1144. When second controller 1144 determines that second measuring point 212 is the load-side measuring point of faulty section 220 and that the fault type in faulty section 220 is a permanent fault, second circuit breaker 1164 at second measuring point 212 is controlled to open. Since first circuit breaker 1162 at first measuring point 211 opens again after reclosing, second circuit breaker 1164 is controlled to open by second controller 1144. At this point, both first circuit breaker 1162 and second circuit breaker 1164 are in the open state, isolating faulty section 220, which is experiencing a permanent fault.

[0052] In the embodiment of the present application, the fault handling component 110 includes a measuring device 112, a controller 114, and a circuit breaker 116. The measuring device 112 is capable of collecting current and voltage measurement values ​​at each measurement point 210. The controller 114 is capable of determining the effective current value and the effective voltage value based on the current and voltage measurement values ​​collected by the measuring device 112. The controller 114 is also capable of locating the power supply-side measurement point of the faulty section 220 based on the duration that the effective current value exceeds a current threshold, and controlling the first circuit breaker 1162 at the power supply-side measurement point to open and then delay reclosing for a first time period. If the fault in the faulty section 220 disappears after reclosing, the fault is determined to be a transient fault, and power supply to the faulty section 220 has been restored. If the fault in the faulty section 220 still exists after reclosing, the fault type is determined to be a permanent fault, and the first circuit breaker 1162 is quickly opened again. When it is detected that the effective value of the voltage is less than the voltage threshold, the measurement point 210 is determined to be on the load side of the fault point, and the timing is started until the first three-phase voltage loss is detected. When the third time duration obtained by timing is within the preset time window, the measurement point 210 is determined to be the load side measurement point of the fault section 220, and the positioning of the load side measurement point of the fault section 220 is completed. When the three-phase voltage loss is detected again within the fourth time duration, the fault section 220 is determined to be a permanent fault. At this time, the second circuit breaker 1164 at the load side measurement point of the fault section 220 is controlled to be disconnected again to isolate the permanent fault. The distribution line short circuit fault processing system based on panoramic information in this application can meet the needs of rapid power restoration of transient faults and precise isolation of permanent faults.

[0053] In some embodiments, optionally, the preset time window is the sum of the first duration and the operation duration of the first circuit breaker 1162 .

[0054] In the embodiment of the present application, since the first circuit breaker 1162 is controlled to disconnect after the effective current value is detected to be continuously greater than the current threshold value for more than the first time period at the power supply side measurement point, the load side measurement point of the fault section 220 will detect the three-phase voltage loss at the load side measurement point after the first time period after detecting that the effective voltage value is less than the voltage threshold value plus the action time period of the first circuit breaker 1162. Therefore, the preset time window is set to the sum of the first time period and the action time period of the first circuit breaker 1162, and whether the measurement point 210 is the load side measurement point of the fault section 220 can be detected based on whether the third time period is within the preset time period window.

[0055] For example, the preset time window is expressed by the following equation (3): t3=t1+t0;(3) Wherein, t3 is the preset time window, t1 is the first duration, and t0 is the action duration of the first circuit breaker 1162 .

[0056] Exemplarily, the first time duration is set to 1s, the action duration of the first circuit breaker 1162 is 0.1s, and the preset time window corresponding to the load side measurement point is set to 1.1s, which is slightly longer than the tripping time of the first circuit breaker 1162, ensuring that complete tripping information can be obtained within the load side judgment time limit.

[0057] In the embodiment of the present application, by setting the preset time window to the sum of the first time length and the opening time window of the first circuit breaker 1162, it is possible to ensure that the complete opening information of the power side circuit breaker 116 can be obtained within the judgment time limit, thereby further improving the accuracy of short circuit fault judgment.

[0058] In some embodiments, optionally, multiple measurement points 210 correspond to multiple first time lengths, and the first time lengths corresponding to the measurement points 210 close to the end of the power supply increase gradually to the measurement points 210 close to the beginning of the power supply.

[0059] In this embodiment, a plurality of measurement points 210 are provided in the power distribution line 200, and a corresponding first duration is set for each measurement point 210. The first duration is set in a stepwise manner from the end of the power source to the beginning of the power source. Thus, the first duration corresponding to the measurement point 210 closer to the end of the power source increases stepwise toward the measurement point 210 closer to the beginning of the power source.

[0060] In the embodiment of the present application, since the distance between each measurement point 210 and the power supply is different, the first time length corresponding to each measurement point 210 is set based on the positional relationship between the measurement point 210 and the power supply, thereby improving the accuracy of locating whether the measurement point 210 is a power supply side measurement point of the fault section 220.

[0061] In some embodiments, optionally, the current threshold value ranges from 1.1 times to 1.3 times the maximum load current value of the distribution line 200 , and the voltage threshold value ranges from 0.6 times to 0.8 times the rated voltage value of the distribution line 200 .

[0062] In some embodiments, the measurement point 210 is optionally located on a pole outside the substation.

[0063] Figure 3 FIG3 shows a schematic diagram of a power distribution line short circuit fault processing system based on panoramic information provided in some embodiments of the present application. Figure 3 As shown, in some specific embodiments, the distribution line includes three sections to be tested, which are section 1, section 2 and section 3. The first circuit breaker and the second circuit breaker at both ends of section 1 are switch 1 and switch 2 respectively, the first circuit breaker and the second circuit breaker at both ends of section 2 are switch 2 and switch 3 respectively, and the first circuit breaker and the second circuit breaker at both ends of section 3 are switch 3 and switch 4 respectively.

[0064] Take the case of a BC two-phase short circuit fault in a distribution system with an ineffective neutral grounding in the section to be tested as an example, as follows: A two-phase short circuit fault occurred at a point in Section 2. After the fault, the currents in phases BC at switches 1 and 2 increased, while the voltages in phases BC at switches 3 and 4 decreased. The measured currents in phases BC at switches 1 and 2 exceeded the current threshold, meeting the power supply-side startup criteria and timing, preparing for output tripping. The effective voltages in phases BC at switches 1 and 2 were also less than the voltage threshold, but the current criteria took precedence, so the voltage criteria was not activated. The currents in phases BC at switches 3 and 4 in Section 3 decreased, falling below the set value, while the voltages in phases BC were less than the voltage threshold. The voltage criteria were activated and timing was initiated to determine the faulty section. The output tripping delay at switch 2 was the shortest, occurring 0.2 seconds after the fault occurred. Switch 2 opens, isolating the fault from the power supply. The currents at switches 1 and 2 decrease, and the voltage recovers. At this point, for switch 1, the effective current drops below the current threshold within the 0.3s output action time delay, so it returns to normal operation at 0.2s. At switch 3, the effective voltage is detected to be less than the second voltage threshold, and with the fault occurring as the starting time, the voltage and current disappear within the 0.1s time window after the opposite-end protection delay. The faulty section is determined to be in section 2, and preparations are made to isolate the permanent fault. Switch 4 determines that the faulty section is within this section, assuming the opposite-end trips at the output at 0.1s. In fact, the opposite-end trips at the output at 0.2s, so the fault is determined not to be within the protected section 3. Therefore, it returns to normal operation at 0.1s.

[0065] Figure 4 FIG. 1 shows one of the switch timing diagrams of transient faults in some embodiments of the present application, such as Figure 4 As shown, when a transient fault occurs in section 2, after switch 2 opens, the protection closes switch 2 after a 1s closing delay. Switch 3 detects incoming power, meeting the criteria that all three-phase voltage RMS values ​​are greater than the voltage threshold. Voltage appears, and the opposite end is considered closed. If the fault is transient, after switch 2 closes, power is restored, and switch 3 detects incoming power, determining the fault is transient, and the lockout does not operate.

[0066] Figure 5 FIG. 1 shows one of the switching timing diagrams of a permanent fault in some embodiments of the present application, such as Figure 5As shown, in the case of a permanent fault in section 2, after switch 2 opens, the protection closes switch 2 after a 1s closing delay. Switch 3 detects incoming power, meeting the incoming power criteria (all three-phase RMS voltages are greater than the voltage threshold). Voltage appears, and the opposite end is considered closed. If a permanent fault occurs, protection is activated after switch 2 closes, and switch 2 opens again without delay. Switch 3 detects a power loss, and all three-phase RMS voltages are less than the second voltage threshold. The opposite end is considered tripped, indicating a permanent fault. Switch 3 then trips the output.

[0067] Take the case of a single-phase short circuit fault on phase A in a neutral point effectively grounded distribution system as an example, as follows: A phase short circuit fault occurs at a point on section 2. After the fault, the current of phase A at switches 1 and 2 increases, and the voltage of phase A at switches 3 and 4 decreases. Figure 2 As shown, the RMS current of phase A at switches 1 and 2 exceeds the current threshold, satisfying the power supply-side triggering criteria and timing, preparing for output tripping. The RMS voltage of phases B and C at switches 1 and 2 also falls below the voltage threshold, but the current criterion takes precedence, so the voltage criterion is not activated. The current of phase A at switches 3 and 4 decreases, falling below the set value, while the RMS voltage of phase A falls below the voltage threshold. The voltage criterion is activated and timing is initiated to determine the faulty section. The output tripping delay at switch 2 is the shortest, occurring 0.2 seconds after the fault occurs. Switch 2 opens, isolating the fault from the power supply side. The current at switches 1 and 2 decreases, and the voltage recovers. At this point, for switch 1, the effective current decreases by less than the effective current value within the 0.3s output action time delay, so it returns to normal operation at 0.2s. At switch 3, the effective voltage is detected to be less than the second voltage threshold, and with the fault occurrence as the starting time, the voltage and current disappear within the 0.1s circuit breaker action time window after the opposite-end protection delay. The fault section is judged to be within this section, and preparations are made to isolate the permanent fault. Switch 4 determines that the fault section is within this section based on the condition that the opposite-end trips at the output at 0.1s, but in fact the opposite-end trips at the output at 0.2s. It is judged that the fault is not within the protected section, so it returns to normal operation at 0.1s.

[0068] In the case of a transient fault, after Switch 2 opens, the protection closes Switch 2 after a 1s closing delay. Switch 3 detects incoming power, and if the three-phase RMS voltages are all greater than the voltage threshold, the voltage appears, and the opposite end is considered closed. In the case of a transient fault, after Switch 2 closes, power is restored, and Switch 3 detects incoming power, determining the fault is transient and preventing the lockout from operating.

[0069] In the case of a permanent fault, after Switch 2 opens, the protection closes Switch 2 after a 1s closing delay. Switch 3 detects incoming power, meeting the incoming power criteria (all three-phase RMS voltages are greater than the voltage threshold). Voltage appears, and the peer-to-peer connection is considered closed. In the case of a permanent fault, protection is accelerated after Switch 2 closes, and Switch 2 opens again without delay. Switch 3 detects a power loss, and all three-phase RMS voltages are less than the second voltage threshold. The peer-to-peer connection is considered tripped, indicating a permanent fault. Switch 3 then trips the output.

[0070] A short circuit fault occurred at a point in section 3. After the fault, the current increased at switches 1, 2, and 3, while the voltage decreased at switch 4. The current measurements at switches 1, 2, and 3 exceeded the current threshold, and a timer was set, preparing for an output trip. The voltage at switches 1, 2, and 3 also fell below the voltage threshold, but the current criterion took precedence, so the voltage criterion was not activated. At switch 4, the current decreased, but remained below the current threshold, while the voltage was below the voltage threshold. The voltage criterion was activated and a timer was set to determine the faulty section. The output trip delay at switch 3 was the shortest, operating 0.1 seconds after the fault occurred. Switch 3 opened, isolating the fault from the power supply. The current at switches 1, 2, and 3 decreased, and the voltage recovered. At switch 4, the power loss, voltage, and current all disappeared. Starting from the fault onset, the voltage and current disappeared within the time window after the opposite-end protection delay. The fault was determined to be within section 3, and preparations were made to isolate the permanent fault.

[0071] Figure 6 The second switching timing diagram of a transient fault in some embodiments of the present application is shown. Figure 7 The second switching sequence diagram for a permanent fault in some embodiments of the present application is shown. After switch 3 opens, after a delay of, for example, 1 second, protection closes switch 3. Switch 4 detects incoming power, voltage and current appear, and determines that the other end is closed. If the fault is permanent, switch 3 closes and protection is activated, accelerating the action. Switch 3 opens again without delay. Switch 4 detects power loss, deeming the other end tripped and the fault permanent. Switch 4 then trips the output. If the fault is transient, switch 3 closes and power is restored. Switch 4 detects incoming power, deeming the fault transient, and the protection is locked out.

[0072] Figure 8 Schematic diagram of the switch on-off state of a transient fault in some embodiments of the present application is shown. Figure 8 As shown, the circuit breakers at each measurement point on the distribution line include switches PU1, PU2, PU3, PU4, and PU5. After detecting a fault, the source-side circuit breaker in faulty section 220 is located as switch PU3 based on the first duration. After a delay of the second duration, switch PU3 is controlled to reclose. After reclosing, the fault disappears, and the fault type in the faulty section is determined to be transient.

[0073] Figure 9 Schematic diagram of the on-off state of a switch with a permanent fault in some embodiments of the present application is shown. Figure 9 As shown, the circuit breakers at each measuring point on the distribution line include switches PU1, PU2, PU3, PU4, and PU5. After detecting a fault, the source-side circuit breaker in faulty section 220 is located as switch PU3 based on the first duration. After a second delay, switch PU3 is controlled to reclose. If the fault persists after reclosing, PU3 is controlled to open again. Based on the third duration corresponding to the three-phase voltage loss caused by the initial disconnection of PU3, the load-side circuit breaker PU4 is located as the faulty section. That is, the section between PU3 and PU4 is faulty section 220. After a fourth delay, PU4 detects the three-phase voltage loss again and determines the fault type of the faulty section is permanent, PU4 is controlled to open, isolating faulty section 220.

[0074] In the claims, specification and drawings of this application, the term "plurality" refers to two or more. Unless otherwise expressly defined, the terms "upper" and "lower" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings. They are intended only to more conveniently describe this application and simplify the description process, and are not intended to indicate or imply that the device or element referred to must have the specific orientation described, be constructed and operated in a specific orientation. Therefore, these descriptions should not be understood as limiting this application. The terms "connect," "install," and "fix" should be understood in a broad sense. For example, "connection" can be a fixed connection between multiple objects, a detachable connection between multiple objects, or an integral connection; it can be a direct connection between multiple objects, or an indirect connection between multiple objects through an intermediate medium. For those of ordinary skill in the art, the specific meanings of the above terms in this application can be understood based on the specific circumstances of the above data.

[0075] In the claims, specification, and drawings of this application, the terms "one embodiment," "some embodiments," "a specific embodiment," and the like mean that the specific features, structures, materials, or characteristics described in conjunction with that embodiment or example are included in at least one embodiment or example of this application. In the claims, specification, and drawings of this application, schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.

[0076] The above are merely preferred embodiments of the present application and are not intended to limit the present application. Those skilled in the art will readily appreciate that various modifications and variations are possible. Any modifications, equivalent substitutions, or improvements made within the spirit and principles of the present application shall be included within the scope of protection of the present application.

Claims

1. A distribution line short circuit fault processing system based on panoramic information, characterized in that: Applied to distribution lines, the distribution line short-circuit fault processing system based on panoramic information includes: A plurality of fault processing components are respectively arranged at a plurality of measuring points of the power distribution line, each of the fault processing components comprising a measuring device, a controller and a circuit breaker; A first fault processing component is disposed at a first measuring point, wherein the first fault processing component includes a first measuring device, a first controller and a first circuit breaker; The first measuring device is used to collect a first current measurement value and a first voltage measurement value at a first measurement point; The first controller is connected to the first measuring device and the first circuit breaker. The first controller is used to determine the first current effective value according to the first current measurement value. When the first current effective value is greater than the current threshold value and exceeds the first time length, the first measurement point is determined to be a power supply side measurement point, and the power supply side measurement point is located on the power supply side of the fault point; the first circuit breaker is controlled to be disconnected, and the first circuit breaker is controlled to be reclosed after a delay of a second time length. The first circuit breaker is located at the power supply side measurement point of the fault section; after the first circuit breaker is reclosed, when it is determined whether the first current effective value is less than or equal to the current threshold value, the fault type is determined to be a transient fault; when the first current effective value is greater than the current threshold value after the first circuit breaker is reclosed, the fault type is determined to be a permanent fault; when the fault type is the permanent fault, the first circuit breaker is controlled to be disconnected; A second fault processing component is disposed at a second measuring point, wherein the second fault processing component includes a second measuring device, a second controller, and a second circuit breaker; The second measuring device is used to collect a second current measurement value and a second voltage measurement value at a second measurement point; The second controller is connected to the second measuring device and the second circuit breaker, and is used to determine a second current effective value according to the second current measurement value, and to determine a second voltage effective value according to the second voltage measurement value; when the second current effective value is not greater than the current threshold value and the second voltage effective value is less than the voltage threshold value, the second measurement point is determined to be a load side measurement point, and the load side measurement point is located on the load side of the fault point; when the second controller detects that the second voltage effective value is less than the voltage threshold value, the timing starts until the three-phase voltage disappears, and a third time length is obtained; The second controller detects that the third time duration is within the preset time window, and determines that the current measurement point is the load-side measurement point of the fault section; after determining that the current measurement point is the load-side measurement point of the fault section, the second controller detects whether three-phase voltage loss is detected again after a fourth time duration, and the fourth time duration is the sum of the reclosing action time and the re-disconnection time of the first circuit breaker of the power supply side measurement point. If three-phase voltage loss is detected after the fourth time duration, it is determined that the fault type is a permanent fault; when the second controller determines that the fault type is a permanent fault, the second circuit breaker is controlled to disconnect, and the second circuit breaker is the load-side circuit breaker of the fault section.

2. The distribution line short circuit fault processing system based on panoramic information according to claim 1 is characterized in that: The preset time window is the sum of the first duration and the action duration of the circuit breaker.

3. The distribution line short circuit fault processing system based on panoramic information according to claim 1 is characterized in that: The plurality of measurement points correspond to the plurality of first time lengths, and the first time length corresponding to the measurement point close to the end of the power source increases step by step to the measurement point close to the beginning of the power source.

4. The distribution line short circuit fault processing system based on panoramic information according to any one of claims 1 to 3, characterized in that: The current threshold value ranges from 1.1 to 1.3 times the maximum load current value of the distribution line, and the voltage threshold value ranges from 0.6 to 0.8 times the rated voltage value of the distribution line.

5. The distribution line short circuit fault processing system based on panoramic information according to any one of claims 1 to 3, characterized in that: The measuring points are located on poles outside the substation.

Images