Fault location method of distribution network in unmanned area

Abstract

The present invention provides a method for locating a fault in a distribution network in an unmanned area, and relates to the technical field of distribution network fault diagnosis. The method comprises a distribution network, a connecting line, a spare line, a control switch, a first resistor, a second resistor and a monitoring device. The monitoring device is arranged on the connecting line between the distribution network and an adjacent distribution network to monitor the distribution situation. The lines between each distribution network and the distribution network are located by regional division and grade classification positioning, so as to facilitate accurate positioning of feedback information. At the same time, the first resistor and the second resistor are connected by the control switch to divide and shunt the line voltage and current, so as to facilitate timely fault inspection and repair according to the current and voltage conditions of the actual connecting line and the distribution network. The distribution network is connected in parallel with the spare line, so as to facilitate the overlapping of the connecting lines at both ends of the distribution network when the overall distribution network fails, without affecting the circulation of the actual circuit, and facilitating accurate positioning of the distribution network and the connecting line and automatic fault inspection and repair.

Description

Technical Field

[0001] The invention relates to the technical field of distribution network fault diagnosis, and in particular to a method for locating distribution network faults in an unmanned area. Background Art

[0002] According to the Chinese patent number "CN110988600A", a method for locating the fault interval of a distribution network is proposed. The present invention measures the line current and line electric field by deploying fault monitoring units in line segments to identify the line branches and phases where the broken line is located; and collects the electric field phase angles sent back by the fault monitoring units of the line where the broken line is located by deploying fault monitoring concentrators at the head ends of the lines and branches, compares the electric field phase angle differences of adjacent monitoring points, identifies the interval where the broken line point is located, and further narrows the broken line search range. The present invention does not require complex power flow calculations and voltage measurements, and only performs broken line fault identification and interval positioning based on current and electric field, which is low-cost and simple and reliable for field application.

[0003] When inspecting the working condition of the distribution network, the above-mentioned patent document only troubleshoots the distribution network and the lines, and is unable to accurately locate the fault location. At the same time, it is unable to automatically inspect and repair the fault. When the distribution network is used in an uninhabited area, it is unable to perform timely inspection and repair, which may easily lead to safety hazards. In addition, when the existing distribution network is damaged as a whole due to natural disasters such as lightning strikes, it is unable to carry out emergency treatment, which may easily cause the distribution network in a large area to be disconnected, which is not conducive to actual use. Summary of the invention

[0004] Technical issues solved

[0005] In view of the deficiencies in the prior art, the present invention provides a method for locating faults in distribution networks in unmanned areas, which solves the problem that the distribution network and connecting lines cannot be automatically repaired due to inaccurate positioning and the problem that the entire distribution network is damaged and emergency treatment cannot be carried out.

[0006] Technical Solution

[0007] To achieve the above objectives, the present invention is implemented by the following technical solutions: a method for locating a fault in a distribution network in an unmanned area, comprising a distribution network, a connecting line, a backup line, a control switch, a first resistor, a second resistor and a monitoring device, wherein the fault location of the distribution network comprises the following steps:

[0008] Sp1: Line installation, adjacent distribution networks are connected through connecting lines, control switches are provided at both ends of the distribution network, and a standby line is connected in parallel between the connecting lines at both ends of the distribution network, a first resistor and a second resistor are provided in parallel at the end of the connecting line and the distribution network, and the first resistor and the second resistor are controlled by the control switch;

[0009] Sp2: Equipment installation, the connection lines and distribution networks are equipped with monitoring equipment;

[0010] Sp3: Regional division: according to the installation location of the monitoring equipment, the specified number of distribution networks are divided into area A, area B, and area C in sequence. The distribution networks in the same area are named in sequence, and the lines between adjacent distribution networks are named in sequence;

[0011] Sp4: Fault monitoring and locating, the monitoring equipment moves to monitor the current and voltage conditions of the connecting lines and the distribution network, and the monitoring fault locating area is displayed by the corresponding label;

[0012] Sp5: Fault classification automatic maintenance A, according to the current and voltage conditions of the connection line and the distribution network, the monitoring equipment controls the control switch to automatically connect the corresponding parallel line to increase or decrease the resistance;

[0013] Sp6: Fault classification automatic maintenance B. In case of overall damage to the distribution network, the monitoring equipment issues a positioning maintenance notice. At the same time, the monitoring equipment controls the control switch to connect the connection lines at both ends of the distribution network to the backup lines for power supply.

[0014] Preferably, the resistance of the first resistor is twice the resistance of the second resistor, and three groups of parallel circuits are provided at the end of the connecting line, which are respectively connected to the first resistor, the second resistor and the spare line, and when the connecting line is used normally, the line where the second resistor is located is selected to work.

[0015] Preferably, the distribution network is provided with two lines in parallel, which are connected in sequence to the first resistor and the second resistor and are controlled by a control switch, and the line where the first resistor and the second resistor are located is connected in parallel with the backup line of the distribution network as a whole.

[0016] Preferably, the areas are divided according to the levels of the areas. The distribution network in area A is located through monitoring equipment and named A1, A2, A3... in sequence. The connecting lines between adjacent A1 and A2 distribution networks are named A1A2a1, A1A2a2, A1A2a3... in sequence. The connection lines and distribution networks in each area are divided, located and named in sequence.

[0017] Preferably, the monitoring device is internally provided with a voltage transformer, a current transformer, a power device, a main control module, a data module, an analysis module, a positioning module and a feedback module, and the external part of the monitoring device that is in contact with the connecting line and the distribution network is provided with a cleaning brush, and the monitoring devices of the connecting line and the distribution network are independently controlled from each other.

[0018] Preferably, the outer edges of the monitoring equipment are all waterproof and sealed, and the monitoring equipment is made of insulating waterproof material.

[0019] Preferably, the monitoring device is electrically connected to an external device via an internal feedback module and a positioning module.

[0020] Beneficial Effects

[0021] The present invention provides a method for locating faults in a power distribution network in an unmanned area. It has the following beneficial effects:

[0022] 1. The present invention uses a monitoring device to set up a connection line between a distribution network and an adjacent distribution network to monitor the distribution situation, and locates the lines between each distribution network and the distribution network through regional division and grade classification positioning, which is convenient for accurate positioning feedback information, and at the same time, a first resistor and a second resistor are connected by a control switch to divide the line voltage and current for use, which is convenient for timely fault inspection and repair according to the current and voltage conditions of the actual connection line and the distribution network. The distribution network is connected in parallel with a spare line, which is convenient for the overlapping of the connection lines at both ends of the distribution network when the entire distribution network fails, without affecting the circulation of the actual circuit, and is convenient for accurate positioning of the distribution network and the connection line and automatic fault inspection and repair.

[0023] 2. The present invention uses distribution network monitoring equipment to classify fault conditions, automatically repairs basic problems such as current and voltage, and provides timely warning reminders when the distribution network is damaged as a whole and cannot be automatically repaired. At the same time, it automatically makes line adjustments to ensure that the faulty distribution network connection is disconnected while maintaining the continuous connection of the connecting lines between adjacent distribution networks, avoiding the impact of distribution network failures on the entire regional line, maintaining the stability of the distribution network during failures, and having high safety, which is convenient for distribution network fault maintenance and early warning use.

[0024] 3. The present invention uses connecting lines between adjacent distribution networks to sequentially set monitoring equipment to inspect and locate the current and voltage of the connecting lines, which is convenient for locating and inspecting multiple lines of the distribution network one by one, improves the accuracy of the connecting lines, facilitates fault finding, and expands the scope of inspection. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 is a method diagram of the present invention;

[0026] Figure 2 This is a plan view of the connection between the connection line of the present invention and the distribution network. DETAILED DESCRIPTION

[0027] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention. Specific embodiment one:

[0029] like Figure 1-2As shown, the method for locating a fault in a distribution network in an unmanned area includes a distribution network, a connecting line, a backup line, a control switch, a first resistor, a second resistor and a monitoring device. The fault location of the distribution network includes the following steps:

[0030] Sp1: Line installation, adjacent distribution networks are connected through connecting lines, control switches are provided at both ends of the distribution network, and a standby line is connected in parallel between the connecting lines at both ends of the distribution network, a first resistor and a second resistor are provided in parallel at both ends of the connecting line and the distribution network, and the first resistor and the second resistor are controlled by the control switch;

[0031] Sp2: Equipment installation, connecting lines and distribution networks are equipped with monitoring equipment;

[0032] Sp3: Regional division: according to the installation location of the monitoring equipment, the specified number of distribution networks are divided into area A, area B, and area C in sequence. The distribution networks in the same area are named in sequence, and the lines between adjacent distribution networks are named in sequence;

[0033] Sp4: Fault monitoring and positioning. The monitoring equipment moves to monitor the current and voltage conditions of the connecting lines and distribution networks. The monitoring fault location area is displayed by the corresponding label;

[0034] Sp5: Fault classification automatic maintenance A, according to the current and voltage conditions of the connection line and the distribution network, the monitoring equipment controls the control switch to automatically connect the corresponding parallel line to increase or decrease the resistance;

[0035] Sp6: Fault classification automatic maintenance B. In case of overall damage to the distribution network, the monitoring equipment issues a positioning maintenance notice. At the same time, the monitoring equipment controls the control switch to connect the connection lines at both ends of the distribution network to the backup lines for power supply.

[0036] The resistance of the first resistor is twice the resistance of the second resistor. Three sets of parallel lines are arranged at the end of the connection line, which are respectively connected to the first resistor, the second resistor and the spare line. When the connection line is in normal use, the line where the second resistor is located is selected to work. The line where the second resistor is located is used to connect the connection lines between adjacent distribution networks. The monitoring equipment monitors the current of the connection line. The monitoring equipment sets a current threshold specified for the connection line. When the current exceeds or falls below the threshold, the monitoring equipment controls the control switch to automatically adjust. If the current is too large, the control switch connects the circuit where the first resistor is located, so that when the two ends of the connection circuit flow through the distribution network, they are shunted through the first resistor for use. By increasing the resistance, the current of the connection line is reduced. If the current is too small, the control switch is connected to At the standby line where the connection line is connected in parallel, the entire connection line is used without resistance. When the resistance is reduced, the current flowing through increases to within the threshold range, so as to adjust the current to be too large or too small. When the voltage is adjusted, the first resistor and the second resistor can be fixed resistors or variable resistors. The size of the resistance is adjusted by the variable resistor to facilitate the adjustment and adaptation with the voltage. The connection lines between adjacent distribution networks are used to set monitoring equipment in sequence to inspect and locate the current and voltage of the connection lines, which is convenient for locating and inspecting multiple lines of the distribution network one by one, improving the accuracy of the connection lines, facilitating fault finding, and expanding the scope of inspection. The distribution network is provided with two lines in parallel, which are connected in sequence to the first resistor and the second resistor, and are controlled by the control switch. And the line where the first resistor and the second resistor are located is connected in parallel with the backup line of the distribution network as a whole. The current and voltage of the distribution network are adjusted in the same way as the connection line adjustment. The connection line of the first resistor and the second resistor is selected for connection and use according to the control switch. The distribution network is used to classify fault conditions through monitoring equipment, and automatic maintenance is performed on basic problems such as current and voltage. Timely warning reminders are given for the situation where the distribution network is damaged as a whole and cannot be automatically maintained. At the same time, line adjustments are automatically made to ensure that the faulty distribution network connection is disconnected while maintaining the continuous connection of the connection lines between adjacent distribution networks, so as to avoid the distribution network failure affecting the entire regional line and maintain the stability of the distribution network during the failure process. It has high safety and is convenient for distribution network fault maintenance and early warning. When the area is divided According to the regional level, the distribution network in area A is located through monitoring equipment and named A1, A2, A3, etc. The connecting lines between adjacent A1 and A2 distribution networks are named A1A2a1, A1A2a2, A1A2a3, etc. The connecting lines and distribution networks in each area are divided, located and named in turn. The multiple distribution networks are divided into zones and numbered after the zones. The lines with the single numbers are numbered and connected, so that each distribution network and connecting line can be located, so that the fault location can be known in time. For example, B5B6b7 means that there is a problem with the b7 connecting line between the B5 distribution network and the B6 distribution network in area B. If the fault problem is D2,This means that D2 in zone D When the distribution network has an overall failure, the backup lines connected to each distribution network are named accordingly. For example, the backup line of the A1 distribution network is named A1a, and the backup line of the D7 distribution network is named D7d. Each distribution network is connected to only one corresponding named backup line. When the distribution network is normal, the backup line remains disconnected and unpowered. When the distribution network fails as a whole, the backup line is connected and powered on. That is, when the backup line works, it means that the corresponding distribution network as a whole has been seriously damaged, reminding the operating personnel to carry out timely maintenance. The connection lines between the distribution network and the adjacent distribution network are used to set up monitoring equipment to monitor the distribution situation. The lines between each distribution network and the distribution network are located through regional division and grade classification positioning, which is convenient for accurate positioning feedback information. At the same time, the first resistor and the second resistor are connected through the control switch to divide the line voltage and current for use, which is convenient for timely fault maintenance according to the current and voltage conditions of the actual connection line and the distribution network. The distribution network is connected in parallel with the backup line, which is convenient for the connection lines at both ends of the distribution network to be overlapped when the distribution network as a whole fails, without affecting the circulation of the actual circuit, and is convenient for accurate positioning of the distribution network and the connection line and automatic maintenance of the fault. The internal setting of the monitoring equipment There are voltage transformers, current transformers, power equipment, main control modules, data modules, analysis modules, positioning modules and feedback modules. The external part of the monitoring equipment that contacts the connection lines and distribution networks is equipped with a cleaning brush. The monitoring equipment of the connection lines and distribution networks are all controlled independently of each other. The external edges of the monitoring equipment are all waterproof and sealed. The monitoring equipment is made of insulating and waterproof materials. The monitoring equipment is electrically connected to the external equipment through the internal feedback module and positioning module. The internal monitoring equipment is equipped with the import of distribution parameters set through the data module, which is convenient for comparison after monitoring. The voltage transformer and the current transformer monitor the voltage and current. The connection of the control switch is controlled by the main control module. The positioning module locates the position of the detection equipment. The distribution network and the connection lines are located and coded through the monitoring module. The cleaning brush cleans the dust of the connection lines and the distribution network. The waterproof material and waterproof treatment keep the monitoring equipment stable and safe when used outdoors for a long time. The monitoring equipment is connected to the external equipment terminal, and the operator remotely monitors the connection status of each distribution network and the connection line in the unmanned area through the external equipment terminal, which is convenient for timely maintenance when a major warning occurs.

[0037] It should be noted that, in this article, relational terms such as first and second, etc. are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device. In the absence of further restrictions, the elements defined by the statement "comprising a reference structure" do not exclude the existence of other identical elements in the process, method, article or device including the elements.

[0038] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A method for locating faults in a distribution network in an unmanned area, comprising a distribution network, a connecting line, a backup line, a control switch, a first resistor, a second resistor and a monitoring device, characterized in that: The fault location of the distribution network comprises the following steps: Sp1: Line installation, adjacent distribution networks are connected through connecting lines, control switches are provided at both ends of the distribution network, and a standby line is connected in parallel between the connecting lines at both ends of the distribution network, a first resistor and a second resistor are provided in parallel at the end of the connecting line and the distribution network, and the first resistor and the second resistor are controlled by the control switch; Sp2: Equipment installation, the connection lines and distribution networks are equipped with monitoring equipment; Sp3: Regional division: according to the installation location of the monitoring equipment, the specified number of distribution networks are divided into area A, area B, and area C in sequence. The distribution networks in the same area are named in sequence, and the lines between adjacent distribution networks are named in sequence; Sp4: Fault monitoring and locating, the monitoring equipment moves to monitor the current and voltage conditions of the connecting lines and the distribution network, and the monitoring fault locating area is displayed by the corresponding label; Sp5: Fault classification automatic maintenance A, according to the current and voltage conditions of the connection line and the distribution network, the monitoring equipment controls the control switch to automatically connect the corresponding parallel line to increase or decrease the resistance; Sp6: Fault classification automatic maintenance B. In case of overall damage to the distribution network, the monitoring equipment issues a positioning maintenance notice. At the same time, the monitoring equipment controls the control switch to connect the connection lines at both ends of the distribution network to the backup lines for power supply.

2. The method for locating faults in a power distribution network in an unmanned area according to claim 1, characterized in that: The resistance of the first resistor is twice that of the second resistor. Three groups of parallel circuits are provided at the end of the connection line, which are respectively connected to the first resistor, the second resistor and the spare line. When the connection line is used normally, the line where the second resistor is located is selected to work.

3. The method for locating faults in a power distribution network in an unmanned area according to claim 1, characterized in that: The distribution network is provided with two lines in parallel, which are connected in sequence to a first resistor and a second resistor and are controlled by a control switch, and the line where the first resistor and the second resistor are located is connected in parallel with a standby line of the distribution network as a whole.

4. The method for locating faults in a power distribution network in an unmanned area according to claim 1, characterized in that: The areas are divided according to their levels. The distribution network in area A is located through monitoring equipment and named A1, A2, A3... in sequence. The connecting lines between adjacent A1 and A2 distribution networks are named A1A2a1, A1A2a2, A1A2a3... in sequence. The connecting lines and distribution networks in each area are divided, located and named in turn.

5. The method for locating faults in a power distribution network in an unmanned area according to claim 1, characterized in that: The monitoring device is internally provided with a voltage transformer, a current transformer, a power device, a main control module, a data module, an analysis module, a positioning module and a feedback module. The external part of the monitoring device in contact with the connecting line and the distribution network is provided with a cleaning brush. The monitoring devices of the connecting line and the distribution network are controlled independently of each other.

6. The method for locating faults in a power distribution network in an unmanned area according to claim 1, characterized in that: The outer edges of the monitoring equipment are all waterproof and sealed, and the monitoring equipment is made of insulating and waterproof material.

7. The method for locating faults in a power distribution network in an unmanned area according to claim 5, characterized in that: The monitoring device is electrically connected to an external device via an internal feedback module and a positioning module.

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