CN111426983A - Single-phase earth fault positioning system of power distribution overhead cable hybrid line - Google Patents
Single-phase earth fault positioning system of power distribution overhead cable hybrid line Download PDFInfo
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- CN111426983A CN111426983A CN202010428081.0A CN202010428081A CN111426983A CN 111426983 A CN111426983 A CN 111426983A CN 202010428081 A CN202010428081 A CN 202010428081A CN 111426983 A CN111426983 A CN 111426983A
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R19/00—Arrangements for measuring currents or voltages or for indicating presence or sign thereof
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/08—Locating faults in cables, transmission lines, or networks
- G01R31/081—Locating faults in cables, transmission lines, or networks according to type of conductors
- G01R31/086—Locating faults in cables, transmission lines, or networks according to type of conductors in power transmission or distribution networks, i.e. with interconnected conductors
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
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- Y04S—SYSTEMS INTEGRATING TECHNOLOGIES RELATED TO POWER NETWORK OPERATION, COMMUNICATION OR INFORMATION TECHNOLOGIES FOR IMPROVING THE ELECTRICAL POWER GENERATION, TRANSMISSION, DISTRIBUTION, MANAGEMENT OR USAGE, i.e. SMART GRIDS
- Y04S10/00—Systems supporting electrical power generation, transmission or distribution
- Y04S10/50—Systems or methods supporting the power network operation or management, involving a certain degree of interaction with the load-side end user applications
- Y04S10/52—Outage or fault management, e.g. fault detection or location
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Abstract
The invention relates to a single-phase earth fault positioning system for a power distribution overhead cable hybrid line. The small current line selection device comprises a voltage component for acquiring three-phase voltage or zero-sequence voltage and a current component for acquiring three-phase current or zero-sequence current, and further comprises a voltage transformation module, a zero-sequence current acquisition module, a current/voltage conversion module, an analog-to-digital conversion module, a data processing module, a controller module, a power supply module and a wireless communication module; the positioning device comprises a voltage component for acquiring three-phase voltage or zero-sequence voltage and a current component for acquiring three-phase current or zero-sequence current, and further comprises a voltage transformation module, a zero-sequence current acquisition module, a current/voltage conversion module, an analog-to-digital conversion module, a data processing module, a controller module, a power supply module and a wireless communication module; the system also comprises a background management host. The method and the device improve the accuracy and the rapidity of the unidirectional grounding fault positioning of the distribution line.
Description
Technical Field
The invention belongs to the technical field of power transmission and distribution fault detection, and particularly relates to a single-phase earth fault positioning system for a power distribution overhead cable hybrid line.
Background
Distribution networks are typically power grids of 110KV and below, and are responsible for supplying power directly to consumers in power systems. The reliability of power supply of the power distribution network directly influences the safety and the economical efficiency of power utilization of users. According to statistics, more than 95% of the power failure time suffered by power consumers is caused by the reason of a power distribution system, and about half of the loss of the power system is generated in a power distribution network. In recent years, with the development of national economy, the electrical load is greatly increased, and phenomena such as switching-off and electricity limiting, frequent faults and the like occur in some regions because the construction of a power distribution network cannot keep pace with the increase of the electrical load level. Meanwhile, the power quality requirements of users are higher and higher. Both power grid dispatching personnel and users urgently hope that quantitative analysis can be carried out on the safety and the economy of power supply of the power distribution network so as to improve the decision accuracy of the dispatching personnel and the intelligent level of the power distribution network. The research on the risk assessment and early warning technology of the power distribution network before the fault, the rapid fault positioning technology in the fault process and the power distribution network fault diagnosis technology after the fault have important theoretical research significance and engineering practice value for the intelligent construction of the current power distribution network.
The single-phase earth fault positioning problem troubles the operation department for a long time, at present, field workers often determine a fault section by a circuit trial-and-error method, namely firstly disconnecting an outgoing breaker of a fault line in a transformer substation, then disconnecting a section switch in the middle of the line, finally reclosing the outgoing breaker of the transformer substation, and if no fault occurs, indicating that a fault point is positioned behind the section switch, and so on. The power grid is impacted by the opening and closing of the switch every time, operation overvoltage and resonance overvoltage are easy to generate, and the service life of the switch is shortened by frequent switching operation. For an unattended substation, remote operation is needed, and the burden of equipment is increased. Therefore, the rapid and accurate fault location technology is beneficial to maintaining the power grid equipment, prolonging the service life of the equipment and reducing the maintenance and overhaul burden.
In conclusion, the single-phase earth fault positioning technology of the low-current grounding system can improve the power supply reliability, improve the economic benefits of power supply departments and users, and maintain power grid equipment, and has important significance. The implementation of distribution automation is a fundamental guarantee for solving the problems existing in the distribution network at present, and the fault location of the distribution network is one of the key technologies of distribution automation, so that how to quickly and accurately locate the fault of the distribution network plays an important role in the economic and reliable operation of the distribution network system in China. However, fault positioning methods are various, and the obtained positioning results are different, so that a method for testing the fault handling performance of the power distribution network is necessary to be researched to ensure the accuracy of fault positioning, the safety, stability and economic operation of the power distribution network are ensured, the popularization and the use of a new energy technology in a power system are facilitated, the social and economic benefits of power supply departments and users can be improved, and the method has important significance for the safe production of the power system.
Disclosure of Invention
The invention provides a single-phase earth fault positioning system of a power distribution overhead cable hybrid line, which is reasonable in structural design and aims to solve the technical problems in the known technology, so that the accuracy and the rapidity of the one-way earth fault positioning of a power distribution line are improved.
The technical scheme adopted by the invention is as follows:
a single-phase earth fault positioning system for a power distribution overhead cable hybrid line comprises a small current line selection device arranged in a transformer substation, wherein the small current line selection device comprises a voltage component which is arranged on a power distribution bus of the transformer substation and is used for acquiring three-phase voltage or zero-sequence voltage, a current component which is arranged on a power distribution branch line and is used for acquiring three-phase current or zero-sequence current at the position, a voltage transformation module, a zero-sequence current acquisition module, a current/voltage conversion module, an analog-to-digital conversion module, a data processing module, a controller module, a power supply module and a wireless communication module, wherein the output end of the zero-sequence current acquisition module is connected with the input end of the current/voltage conversion module, the output ends of the voltage transformation module and the current/voltage conversion module are connected with the analog-to-digital conversion module, and the output end of the, the data processing module, the power supply module and the wireless communication module are all connected with the controller module, the output end of the voltage component is connected to the input end of the voltage transformation module, and the output end of the current component is connected to the input end of the zero sequence current acquisition module; the positioning device comprises a voltage component which is arranged on a distribution line and used for acquiring three-phase voltage or zero-sequence voltage and a current component which is arranged on the distribution line and used for acquiring three-phase current or zero-sequence current, a voltage transformation module, a zero-sequence current acquisition module, a current/voltage conversion module, an analog-to-digital conversion module, a data processing module, a controller module, a power supply module and a wireless communication module, wherein the output end of the zero-sequence current acquisition module is connected with the input end of the current/voltage conversion module, the output ends of the voltage transformation module and the current/voltage conversion module are connected with the analog-to-digital conversion module, the output end of the analog-to-digital conversion module is connected with the input end of the data processing module, the power supply module and the wireless communication module are all connected with the controller module, and the output end of the, the output end of the current component is connected to the input end of the zero sequence current acquisition module; the low-current line selection device and the positioning devices are in communication connection with the background management host through respective wireless communication modules.
Further, the voltage components of the small current line selection device are voltage transformers, and the current components are three current transformers and a zero sequence current transformer which are respectively arranged on each phase line; the voltage component of the positioning device is a voltage transformer, and the current component is an intelligent circuit breaker.
Further, a power supply module of the low-current line selection device directly obtains electric energy from a power supply facility of a transformer substation, and the power supply module comprises a voltage converter; the power module of the positioning device comprises a rechargeable battery and a storage battery management circuit, wherein the rechargeable battery is powered by a voltage transformer.
Further, the voltage transformers of the small current line selection devices and the positioning devices are selected to be three-phase five-column voltage transformers.
Furthermore, master station software is arranged in the background management host; the main station software comprises a data processing module for processing data transmitted by each small-current line selection device and each positioning device, and a positioning module for determining the position of the one-way grounding fault according to the data processing result.
The invention has the advantages and positive effects that:
1. according to the invention, the small current line selection device with the voltage component and the current component is arranged on the distribution bus of the transformer substation, so that the three-phase voltage and the zero-sequence voltage on the distribution bus and the three-phase current and the zero-sequence current on the distribution branch line are obtained, and the line selection operation of a fault line is realized through comprehensive calculation by taking the three-phase current, the zero-sequence current, the three-phase voltage and the zero-sequence voltage as parameters.
2. The voltage component and the current component are arranged on the wire rods of the power distribution branch line, the purpose of multi-point three-phase voltage, zero-sequence voltage, three-phase current and zero-sequence current on the power distribution branch line is achieved, the judgment of the one-way grounding fault position is achieved through comprehensive calculation with the three-phase current, the zero-sequence current, the three-phase voltage and the zero-sequence voltage as parameters, the one-way grounding fault point obtained through judgment is located between two adjacent wire rods on the power distribution branch line, therefore, the relatively accurate positioning of the fault position is achieved, and the fault is more easily processed in time.
3. Through setting up backstage management host computer and each undercurrent route selection device all with background management host computer wireless communication connection, realized the automated processing of above-mentioned fault diagnosis process, the fault location process is more rapid.
Drawings
FIG. 1 is a schematic structural view of the present invention;
FIG. 2 is a block diagram showing the installation state of the small current line selection device in FIG. 1;
FIG. 3 is a block diagram showing an installation state of the positioning apparatus of FIG. 1;
in the figure: 1-low current line selection device, 2-positioning device, 3-line pole, 4-background management host.
Detailed Description
In order to further understand the contents, features and effects of the present invention, the following embodiments are described in detail as follows:
as shown in fig. 1 to 3, the single-phase earth fault location system of the distribution overhead cable hybrid line of the present invention includes a low current line selection device 1 disposed in a substation, where the low current line selection device 1 includes a voltage component disposed on a distribution bus of the substation for obtaining three-phase voltage or zero-sequence voltage, and a current component disposed on a distribution branch for obtaining three-phase current or zero-sequence current at the position.
In this embodiment, the voltage components of the small current line selection device 1 are voltage transformers, and the current components are three current transformers and one zero sequence current transformer respectively arranged on each phase line. Further, the voltage transformer is selected to be a three-phase five-column voltage transformer. The three current transformers are respectively arranged on the three phase lines of the distribution branch line to respectively obtain phase currents on the three phase lines, the zero sequence current transformers are used for obtaining zero sequence currents on the distribution branch line, and the phase currents on the three phase lines can be synthesized to obtain the zero sequence currents.
The small current line selection device 1 further comprises a voltage transformation module, a zero sequence current acquisition module, a current/voltage transformation module, an analog-to-digital conversion module, a data processing module, a controller module, a power supply module and a wireless communication module, wherein the output end of the zero sequence current acquisition module is connected with the input end of the current/voltage transformation module, the output ends of the voltage transformation module and the current/voltage transformation module are connected with the analog-to-digital conversion module, the output end of the analog-to-digital conversion module is connected with the input end of the data processing module, the power supply module and the wireless communication module are connected with the controller module, the output end of the voltage component is connected to the input end of the voltage transformation module, and the output end of.
The transformation module, the zero sequence current acquisition module, the current/voltage conversion module, the analog-to-digital conversion module, the data processing module, the controller module, the power module and the wireless communication module are packaged in a shell to form integrated equipment, the wiring port is arranged on the shell of the equipment, and the voltage component, namely the voltage transformer, the current component, namely three current transformers and one zero sequence current transformer are connected to the corresponding wiring port through the wiring terminals and the lead wires to input signals.
The voltage component, namely the voltage transformer, acquires phase voltage and zero sequence voltage from each phase line, the voltage signals are output to the transformation module, low-voltage signals formed after voltage reduction/filtering processing of the transformation module are transmitted to the analog-to-digital conversion module for analog-to-digital conversion, digitized signals are formed, and the digitized signals enter the data processing module for data processing and calculation. The current assembly, namely three current transformers and a zero sequence current transformer, acquires phase current and zero sequence current from each phase line, the current signals are output to a zero sequence current acquisition module to acquire final zero sequence current, the zero sequence current signals enter a current/voltage conversion module to be converted into voltage signals, the converted voltage signals are transmitted to an analog-to-digital conversion module to be subjected to analog-to-digital conversion to form digitized signals, and the digitized signals enter a data processing module to be subjected to data processing and calculation.
The controller module transmits the signals and the results of the preliminary processing and calculation to the outside through the wireless communication module.
The power module provides power for the whole low-current line selection device 1, and because the low-current line selection device 1 is installed in a cabinet of a transformer substation and a power supply facility is usually arranged in the transformer substation, the power module of the low-current line selection device 1 directly obtains electric energy from the power supply facility of the transformer substation, and comprises a voltage converter which is used for transforming the power provided by the power supply facility of the transformer substation to a voltage value received by the low-current line selection device 1.
The power distribution system further comprises a positioning device 2 arranged on each wire pole 3 of the power distribution branch line, wherein the positioning device 2 comprises a voltage component and a current component, the voltage component is arranged on the power distribution line and used for obtaining three-phase voltage or zero-sequence voltage, and the current component is used for obtaining three-phase current or zero-sequence current.
In this embodiment, the voltage component of the positioning device 2 is a voltage transformer, and the current component is an intelligent circuit breaker. Further, the voltage transformer is selected to be a three-phase five-column voltage transformer. The intelligent circuit breaker is an existing component, is mainly used for controlling and protecting a low-voltage distribution network, and is generally installed and configured on each wire rod 3 of a distribution branch. The basic working mode of the intelligent circuit breaker is that the preset working conditions of the operating mechanism and the arc extinguish chamber are automatically selected according to the monitored different fault currents, if the normal running current is small, the operation is carried out at a low speed, and if the system short-circuit current is large, the operation is carried out at a high speed, so that the optimal operation effect on the electrical and mechanical properties is obtained. The working process of the intelligent circuit breaker is as follows: when the system fault is sent out by a relay protection device and an opening signal or an operation signal by an operator, firstly, the intelligent identification module is started to work, the working condition of the current circuit breaker is judged, different quantitative control information is sent to the adjusting device to automatically adjust the parameters of the operating mechanism so as to obtain the motion characteristic which is adaptive to the working state of the current system, and then the circuit breaker is enabled to act.
The voltage transformer is used for obtaining phase voltages and zero sequence voltages of three phase lines of a distribution line, and phase currents and zero sequence currents on the three phase lines are directly obtained through the intelligent circuit breaker.
The positioning device 2 further comprises a voltage transformation module, a zero sequence current acquisition module, a current/voltage transformation module, an analog-to-digital conversion module, a data processing module, a controller module, a power supply module and a wireless communication module, wherein the output end of the zero sequence current acquisition module is connected with the input end of the current/voltage transformation module, the output ends of the voltage transformation module and the current/voltage transformation module are connected with the analog-to-digital conversion module, the output end of the analog-to-digital conversion module is connected with the input end of the data processing module, the power supply module and the wireless communication module are connected with the controller module, the output end of the voltage component is connected to the input end of the voltage transformation module, and the output end of.
The transformation module, the zero sequence current acquisition module, the current/voltage conversion module, the analog-to-digital conversion module, the data processing module, the controller module, the power module and the wireless communication module are packaged in a shell to form integrated equipment, a wiring port is arranged on the shell of the equipment, and the voltage component, namely the voltage transformer and the current component, namely the intelligent circuit breaker are connected to the corresponding wiring port through the wiring terminals and the lead wires to input signals.
The voltage component, namely the voltage transformer, acquires phase voltage and zero sequence voltage from each phase line, the voltage signals are output to the transformation module, low-voltage signals formed after voltage reduction/filtering processing of the transformation module are transmitted to the analog-to-digital conversion module for analog-to-digital conversion, digitized signals are formed, and the digitized signals enter the data processing module for data processing and calculation. The current component, namely the intelligent circuit breaker, acquires phase current and zero sequence current from each phase line, the current signals are output to the zero sequence current acquisition module to acquire final zero sequence current, the zero sequence current signals enter the current/voltage conversion module to be converted into voltage signals, the converted voltage signals are transmitted to the analog-to-digital conversion module to be subjected to analog-to-digital conversion to form digitized signals, and the digitized signals enter the data processing module to be subjected to data processing and calculation.
The controller module transmits the signals and the results of the preliminary processing and calculation to the outside through the wireless communication module.
Power module provides the power for whole positioner 2, because positioner 2 installs on pole 3, and does not have power supply facility usually on the pole 3, therefore positioner 2's power module includes the rechargeable battery who obtains the electric energy by voltage transformer, still includes battery management circuit, and voltage transformer obtains the electric energy through the mode of induction electricity, and this electric energy is carried to rechargeable battery and is stored and use.
The low-current line selection device comprises a positioning device 2 and a background management host 4, wherein the positioning device 2 is connected with the low-current line selection device 1 through a wireless communication module, and the wireless communication module is connected with the background management host 4 through a wireless communication module.
The background management host 4 is internally provided with master station software; the main station software comprises a data processing module for processing data transmitted by each small-current line selection device 1 and each positioning device 2, and a positioning module for determining the position of the one-way ground fault according to the data processing result. The data processing module is internally provided with a data processing algorithm which carries out comprehensive calculation by taking the three-phase current, the zero-sequence current, the three-phase voltage and the zero-sequence voltage as parameters to judge the one-way earth fault, the positioning module is used for judging the position of the single-phase earth fault, the position of the single-phase earth fault is positioned to the position between two adjacent wire poles 3 on the power distribution branch line, and after the fault is positioned, troubleshooting and maintenance personnel carry out accurate troubleshooting and maintenance on the position of the fault point on the line between the two wire poles 3.
Claims (5)
1. The utility model provides a single-phase earth fault positioning system of distribution overhead cable hybrid line which characterized in that: the low-current line selection device comprises a voltage component which is arranged on a distribution bus of the transformer substation and used for acquiring three-phase voltage or zero-sequence voltage, and a current component which is arranged on a distribution branch line and used for acquiring three-phase current or zero-sequence current of the position, and also comprises a voltage transformation module, a zero-sequence current acquisition module, a current/voltage conversion module, an analog-to-digital conversion module, a data processing module, a controller module, a power supply module and a wireless communication module, wherein the output end of the zero-sequence current acquisition module is connected with the input end of the current/voltage conversion module, the output ends of the voltage transformation module and the current/voltage conversion module are connected with the analog-to-digital conversion module, the output end of the analog-to-digital conversion module is connected with the input end of the data processing module, and the data processing module, the power supply module and the wireless communication module, the output end of the voltage component is connected to the input end of the voltage transformation module, and the output end of the current component is connected to the input end of the zero sequence current acquisition module; the positioning device comprises a voltage component which is arranged on a distribution line and used for acquiring three-phase voltage or zero-sequence voltage and a current component which is arranged on the distribution line and used for acquiring three-phase current or zero-sequence current, a voltage transformation module, a zero-sequence current acquisition module, a current/voltage conversion module, an analog-to-digital conversion module, a data processing module, a controller module, a power supply module and a wireless communication module, wherein the output end of the zero-sequence current acquisition module is connected with the input end of the current/voltage conversion module, the output ends of the voltage transformation module and the current/voltage conversion module are connected with the analog-to-digital conversion module, the output end of the analog-to-digital conversion module is connected with the input end of the data processing module, the power supply module and the wireless communication module are all connected with the controller module, and the output end of the, the output end of the current component is connected to the input end of the zero sequence current acquisition module; the low-current line selection device and the positioning devices are in communication connection with the background management host through respective wireless communication modules.
2. The power distribution overhead cable hybrid line single phase ground fault location system of claim 1, wherein: the voltage components of the small current line selection device are voltage transformers, and the current components are three current transformers and a zero sequence current transformer which are respectively arranged on each phase line; the voltage component of the positioning device is a voltage transformer, and the current component is an intelligent circuit breaker.
3. The power distribution overhead cable hybrid line single phase ground fault location system of claim 1, wherein: the power module of the low-current line selection device directly obtains electric energy from a power supply facility of a transformer substation and comprises a voltage converter; the power module of the positioning device comprises a rechargeable battery and a storage battery management circuit, wherein the rechargeable battery is powered by a voltage transformer.
4. The power distribution overhead cable hybrid line single phase ground fault location system of claim 1, wherein: and the voltage transformers of the small current line selection devices and the positioning devices are selected to be three-phase five-column voltage transformers.
5. The power distribution overhead cable hybrid line single phase ground fault location system of claim 1, wherein: a master station software is arranged in the background management host; the main station software comprises a data processing module for processing data transmitted by each small-current line selection device and each positioning device, and a positioning module for determining the position of the one-way ground fault according to the data processing result.
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Application publication date: 20200717 |