10KV distribution line fault semi-automatic positioning alarm system

Abstract

The invention discloses a 10KV distribution line fault semi-automatic positioning alarm system which comprises a signal generator, a fault indicator, a cable fault tester, a master station communication terminal, a master station host system, a communication system and a remote monitoring center. The signal generator is used for injecting a special detection signal and is installed on a transformer substation bus. The fault indicator is used for locking a preliminary fault section and is installed at a key position of a distribution line. The cable fault tester is used for accurate fault positioning. The master station communication terminal and the communication system are used for data transmission among the fault indicator, the master station host system and the remote monitoring center; current signals at key positions of a cable line are automatically monitored through the signal generator and the fault indicator, the approximate position interval of a fault is preliminarily locked, and then the accurate position of the fault is positioned on site through the cable fault tester, so that maintenance is rapidly completed, the power failure time is shortened, and the power supply service quality is improved; and the user satisfaction is improved.

Description

Technical Field

[0001] The invention belongs to the technical field of distribution line fault alarm, and in particular relates to a 10KV distribution line fault semi-automatic positioning alarm system. Background Art

[0002] Power distribution is the link in the power system that is directly connected to the user and distributes electric energy to the user. The distribution system consists of distribution substations, high-voltage distribution lines, distribution transformers, low-voltage distribution lines and corresponding control and protection equipment. For users, power distribution is the link closest to the user, among which the 10kV distribution line is the last layer of the power grid structure facing the end user. With the development of my country's economy and the improvement of people's living standards, the demand for electricity is increasing, which has led to an increasing number of 10kV distribution lines being put into use, and at the same time, there are higher requirements for power supply reliability.

[0003] When an existing 10kV distribution line fails, generally only the outlet circuit breaker trips. Even if switches are used to divide the trunk line into sections, only a limited number of sections can be isolated. To find the specific fault location, it often takes a lot of manpower, material resources and time. In addition, the actual power grid operating environment is more complex, which brings many difficulties to the line inspection work after equipment failure.

[0004] At present, most power supply companies still use the method of manual line patrol to find the specific location of the fault. Maintenance personnel need certain work experience, heavy workload, and long time. The actual number of 10kV distribution lines has increased, but the staffing cannot keep up, which has caused great troubles in restoring power supply as soon as possible and reduced the quality of power supply service. In order to solve the above problems, it is necessary to develop a semi-automatic positioning alarm system for 10KV distribution line faults. Summary of the invention

[0005] The purpose of the present invention is to overcome the deficiencies of the prior art and to provide a 10KV distribution line fault semi-automatic location alarm system which has semi-automatic fault detection, accurate fault location, short fault repair time and helps to improve the quality of power supply service.

[0006] The object of the present invention is achieved as follows: a 10KV distribution line fault semi-automatic positioning alarm system, comprising a signal generator, a fault indicator, a cable fault tester, a master station communication terminal, a master station host system, a communication system and a remote monitoring center; the signal generator is used to inject a special detection signal; the fault indicator is used to lock the preliminary fault interval; the cable fault tester is used for accurate fault positioning; the master station communication terminal and the communication system are used for data transmission between the fault indicator and the master station host system and the remote monitoring center; The signal generator is installed on the substation bus, and multiple fault indicators are installed at key positions of the distribution line. The master station communication terminal and the master station host system are installed in the substation. The signal generator continuously injects detection signals through the substation bus. When the fault indicator detects a fault, it will alarm on site and send the alarm signal to the master station communication terminal through the communication system. The master station communication terminal forwards the alarm signal to the master station host system. The master station host system sends the maintenance work order to the maintenance personnel and the remote monitoring center. The maintenance personnel carry the cable fault tester to the approximate location of the fault indicated by the fault indicator for fault maintenance. The maintenance personnel quickly detect and locate the exact location of the fault through the cable fault detector for the cable where the on-site alarm fault indicator is located, and then quickly complete the maintenance work. The remote monitoring center supervises the completion of the maintenance work according to the maintenance work order.

[0007] Furthermore, the fault indicator is specifically installed at the substation outlet, the connection between the cable and the overhead line, the user's high-voltage distribution line, the middle section of the long line, the branch entrance, the medium-voltage overhead line trunk section, the head end of the longer branch line, the head end of the cable branch line, the medium-voltage power user line, and the plain or open area.

[0008] Furthermore, the fault indicator gives an on-site alarm by mechanically flipping or emitting light from a light emitting diode.

[0009] Furthermore, the master station host system is equipped with geographic location information of all fault indicators. After receiving the alarm signal, the master station host system writes the geographic location information of the fault indicator that sends the alarm signal into the maintenance work order and sends it to the maintenance personnel in the form of a short message.

[0010] Furthermore, the communication system includes wireless communication technology and serial port communication technology.

[0011] Furthermore, it also includes a high-voltage signal generator, which is carried by maintenance personnel and used in conjunction with the cable fault tester to enhance the detection function of high-resistance faults.

[0012] Furthermore, it also includes an insulation resistance tester, which is carried by maintenance personnel and is used to measure the insulation resistance of the faulty cable before fault location and after maintenance is completed to ensure that the insulation performance of the faulty cable is restored to a normal level.

[0013] Due to the adoption of the above technical scheme, the beneficial effects of the present invention are as follows: the present invention adopts a signal generator, a fault indicator and a cable fault tester, which can first automatically monitor the current signal at the key position of the cable line through the signal generator and the fault indicator, preliminarily lock the approximate position interval of the fault, and then locate the precise position of the fault on-site through the cable fault tester, so as to quickly complete the maintenance, greatly shorten the power supply restoration time after the fault occurs, and improve the power supply service quality; the present invention adopts a signal generator, a fault indicator, a cable fault tester, a master station communication terminal, a master station host system, a communication system and a remote monitoring center, most of the detection work can be completed automatically, effectively reducing the usage and workload of staff, and adapting to the current use of insufficient staff; in general, the present invention has the advantages of semi-automatic fault detection, accurate fault location, short fault repair time and helps to improve the quality of power supply service. DETAILED DESCRIPTION

[0014] It should be understood that the 10KV distribution line is a medium-voltage distribution line, which is mainly used to transmit the power from the substation to various power users, such as factories, residential areas, commercial areas, etc. Structurally, it generally includes overhead lines and cable lines. Overhead lines are composed of poles, insulators, conductors, hardware, etc. The conductors are usually made of aluminum stranded wire or steel-core aluminum stranded wire, which are erected on poles and towers and insulated from the poles and towers by insulators. The construction cost is relatively low and it is easy to maintain and repair, but it is greatly affected by the environment. Cable lines are cables laid in underground pipelines, cable trenches or bridges. They do not occupy surface space, are less affected by the natural environment, and have high power supply reliability, but the construction and maintenance costs are relatively high.

[0015] During operation, 10KV distribution lines will be subjected to certain voltage, current and various environmental factors. First of all, the quality of electric energy needs to be guaranteed, such as voltage stability, qualified frequency, etc. At the same time, due to its wide distribution, it may face various faults, such as short circuit faults (which may be caused by foreign objects connecting wires, small animals climbing onto towers, etc.), ground faults (which may be caused by insulation damage, etc.), and line break faults (which may be caused by severe weather such as strong winds, ice and snow), which may cause power outages. Therefore, fault diagnosis and maintenance of 10KV distribution lines are important links in ensuring the end-to-end power supply.

[0016] The technical solution of the present invention is further specifically described below through embodiments.

[0017] The present invention provides a 10KV distribution line fault semi-automatic positioning alarm system, comprising a signal generator, a fault indicator, a cable fault tester, a master station communication terminal, a master station host system, a communication system and a remote monitoring center, etc. The system first performs preliminary interval positioning of the fault part through an online signal injection method, and then accurately locates the fault part through on-site testing. Then, on the basis of accurate positioning, the system achieves the purpose of quickly completing maintenance and quickly restoring power supply, thereby reducing the occurrence of power consumption accidents such as unstable power quality, safety hazards in power transmission, and long-term power outages, and improving user satisfaction.

[0018] Among them, the signal generator is used to inject special detection signals; the signal generator is mainly used to inject specific electrical signals into the distribution line. When diagnosing faults such as short circuit, open circuit or low resistance of the distribution line, a pulse signal or audio signal is sent to the distribution line. The signal propagates along the distribution line. When encountering a fault point, the signal will be reflected or otherwise changed, so that it will be detected by the fault indicator located near the fault point, thereby completing the section fault location function.

[0019] Among them, the fault indicator is used to lock the preliminary fault interval; the fault indicator mainly determines whether there is a fault by monitoring the changes in electrical parameters such as current and voltage in the distribution line. When the distribution line works normally, it will maintain a stable current and voltage state, but once a fault occurs, such as a short circuit or a grounding fault, the current and voltage will suddenly change, which will be captured online by the fault indicator. Through the built-in sensor, the fault indicator is triggered to act, such as mechanical flipping or light-emitting diode lighting, which intuitively shows the occurrence of the fault and issues an on-site alarm. At the same time, the alarm is sent to the main station communication terminal through wireless communication, providing the operation and maintenance personnel with the approximate location of the fault in real time, quickly locating the fault area, and thus dispatching maintenance personnel to repair it in time to reduce power outage time.

[0020] Among them, the cable fault tester is used for accurate fault location; the cable fault tester contains a signal generator, a signal receiver, an analysis and processing unit and a display unit. The signal generator sends a detection signal, the signal receiver receives the reflected signal, and the analysis and processing unit digitizes the transmitted signal to extract key information such as signal round-trip time and waveform characteristics (such as amplitude, frequency changes), and calculates the distance from the fault point to the test end based on the signal round-trip time and the known signal propagation speed, thereby accurately detecting various faults such as short circuit, open circuit, high resistance and low resistance of the distribution line. The display unit displays waveform and other data to maintenance personnel in an intuitive manner, making it convenient for them to analyze the fault situation.

[0021] The fault indicator and cable fault tester work together to achieve the functions of real-time monitoring of the fault point, rapid positioning of the fault interval, and precise positioning of the fault point.

[0022] Among them, the main station communication terminal and communication system are used for data transmission between the fault indicator and the main station host system and the remote monitoring center, completing the online fault detection function of the fault indicator, timely discovering the occurrence of faults and reminding the staff to deal with them in time.

[0023] Fault indicators are generally installed at the outlet of the substation (used to determine whether the fault occurs inside or outside the station), the connection between the cable and the overhead line (used to distinguish whether the fault occurs in the cable section or the overhead section), the user's high-voltage incoming line (used to determine whether the fault is caused by the user), the middle section of the long line (used to indicate the line fault section), the branch entrance (used to indicate the faulty branch), the medium-voltage overhead line trunk section (used to monitor line faults), the head end of a longer branch line (used to monitor branch line faults), the head end of a cable branch line (used to monitor cable faults), the medium-voltage power user incoming line (used to monitor user incoming line faults) and plains or open areas (used to reduce line search pressure), etc. Specifically, it can be installed and used according to the installation points of the existing technology.

[0024] The main station host system is equipped with the geographic location information of all fault indicators. After receiving the alarm signal, the main station host system will write the geographic location information of the fault indicator that sent the alarm signal into the maintenance work order and send it to the maintenance personnel in the form of a short message, so that the maintenance personnel can directly and quickly reach the fault point to troubleshoot the fault.

[0025] The communication system includes wireless communication technology and serial communication technology. Wireless communication technology is preferred. Wireless communication technology is flexible and convenient in networking and is easy to expand later.

[0026] During specific implementation, maintenance personnel can also carry a high-voltage signal generator, which can generate a higher voltage to cause an obvious flashover at the fault point, so that the cable fault tester can better detect the reflected signal and enhance the detection function of high-resistance faults.

[0027] During specific implementation, maintenance personnel can also carry an insulation resistance tester to measure the insulation resistance of the faulty cable before fault location and after maintenance is completed, evaluate the insulation performance of the faulty cable after maintenance, and ensure that the insulation performance of the faulty cable returns to normal levels.

[0028] During operation, the signal generator is installed on the substation bus, and multiple fault indicators are installed at key positions of the distribution line. The master station communication terminal and the master station host system are installed in the substation. The signal generator continuously injects detection signals through the substation bus. When the fault indicator detects a fault, it will alarm on site and send the alarm signal to the master station communication terminal through the communication system. The master station communication terminal forwards the alarm signal to the master station host system. The master station host system sends the maintenance work order to the maintenance personnel and the remote monitoring center. The maintenance personnel carry the cable fault tester to the approximate location of the fault indicated by the fault indicator for fault maintenance. The maintenance personnel quickly detect and locate the exact location of the fault through the cable fault detector for the cable where the on-site alarm fault indicator is located, and then quickly complete the maintenance work. The remote monitoring center supervises the completion of the maintenance work according to the maintenance work order.

[0029] In summary, the present invention uses a signal generator, a fault indicator and a cable fault tester to automatically monitor the current signal at the key position of the cable line, preliminarily lock the approximate position interval of the fault, and then use the cable fault tester to locate the precise position of the fault on site, thereby quickly completing the maintenance, greatly shortening the power supply restoration time after the fault occurs, and improving the power supply service quality; the present invention uses a signal generator, a fault indicator, a cable fault tester, a master station communication terminal, a master station host system, a communication system and a remote monitoring center, most of the detection work can be automatically completed, effectively reducing the usage and workload of staff, and adapting to the current use of insufficient staff; in general, the present invention has the advantages of semi-automatic fault detection, accurate fault location, short fault repair time and help to improve the quality of power supply services.

[0030] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention rather than to limit it. Although the present invention has been described in detail with reference to the above embodiments, those skilled in the art should understand that the specific implementation modes of the present invention can still be modified or replaced by equivalents, and any modification or equivalent replacement that does not depart from the spirit and scope of the present invention should be included in the scope of the claims of the present invention.

Claims

1. A 10KV distribution line fault semi-automatic location alarm system, characterized by: It includes a signal generator, a fault indicator, a cable fault tester, a master station communication terminal, a master station host system, a communication system and a remote monitoring center; the signal generator is used to inject a special detection signal; the fault indicator is used to initially lock the fault interval; The cable fault tester is used for accurate fault location; the master station communication terminal and communication system are used for data transmission between the fault indicator and the master station host system and the remote monitoring center; The signal generator is installed on the substation bus, and multiple fault indicators are installed at key positions of the distribution line. The master station communication terminal and the master station host system are installed in the substation. The signal generator continuously injects detection signals through the substation bus. When the fault indicator detects a fault, it will alarm on site and send the alarm signal to the master station communication terminal through the communication system. The master station communication terminal forwards the alarm signal to the master station host system. The master station host system sends the maintenance work order to the maintenance personnel and the remote monitoring center. The maintenance personnel carry the cable fault tester to the approximate location of the fault indicated by the fault indicator for fault maintenance. The maintenance personnel quickly detect and locate the exact location of the fault through the cable fault detector for the cable where the on-site alarm fault indicator is located, and then quickly complete the maintenance work. The remote monitoring center supervises the completion of the maintenance work according to the maintenance work order.

2. The 10KV distribution line fault semi-automatic location alarm system according to claim 1 is characterized by: The fault indicator is specifically installed at the transformer substation outlet, the connection between the cable and the overhead line, the user's high-voltage distribution line entry point, the middle section of a long line, the branch entrance, the medium-voltage overhead line trunk section, the head end of a longer branch line, the head end of a cable branch line, the medium-voltage power user entry point, and plains or open areas.

3. The 10KV distribution line fault semi-automatic positioning alarm system according to claim 1 is characterized by: The fault indicator gives an on-site alarm by mechanically turning over or emitting light from a light emitting diode.

4. The 10KV distribution line fault semi-automatic location alarm system according to claim 1 is characterized by: The master station host system is equipped with the geographical location information of all fault indicators. After receiving the alarm signal, the master station host system writes the geographical location information of the fault indicator that sends the alarm signal into the maintenance work order and sends it to the maintenance personnel in the form of a short message.

5. The 10KV distribution line fault semi-automatic location alarm system according to claim 1 is characterized by: The communication system includes wireless communication technology and serial port communication technology.

6. The 10KV distribution line fault semi-automatic positioning alarm system according to claim 1 is characterized by: It also includes a high-voltage signal generator, which is carried by maintenance personnel and used in conjunction with the cable fault tester to enhance the detection function of high-resistance faults.

7. The 10KV distribution line fault semi-automatic location alarm system according to claim 1 is characterized by: It also includes an insulation resistance tester, which is carried by maintenance personnel and is used to measure the insulation resistance of the faulty cable before fault location and after maintenance is completed to ensure that the insulation performance of the faulty cable returns to normal levels.