CN108347042B - Ring main unit intelligent and accurate measurement in-situ removal protection system and implementation method thereof - Google Patents
Ring main unit intelligent and accurate measurement in-situ removal protection system and implementation method thereof Download PDFInfo
- Publication number
- CN108347042B CN108347042B CN201810281852.0A CN201810281852A CN108347042B CN 108347042 B CN108347042 B CN 108347042B CN 201810281852 A CN201810281852 A CN 201810281852A CN 108347042 B CN108347042 B CN 108347042B
- Authority
- CN
- China
- Prior art keywords
- data
- line
- fault
- controller
- module
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
- 238000011065 in-situ storage Methods 0.000 title claims abstract description 11
- 238000005259 measurement Methods 0.000 title claims description 12
- 238000000034 method Methods 0.000 title claims description 10
- 238000012544 monitoring process Methods 0.000 claims abstract description 64
- 238000012545 processing Methods 0.000 claims abstract description 17
- 238000007726 management method Methods 0.000 claims description 24
- 230000009471 action Effects 0.000 claims description 21
- 238000004891 communication Methods 0.000 claims description 21
- 238000002955 isolation Methods 0.000 claims description 21
- 241000854291 Dianthus carthusianorum Species 0.000 claims description 19
- 230000008878 coupling Effects 0.000 claims description 16
- 238000010168 coupling process Methods 0.000 claims description 16
- 238000005859 coupling reaction Methods 0.000 claims description 16
- 230000003287 optical effect Effects 0.000 claims description 16
- 230000002159 abnormal effect Effects 0.000 claims description 11
- 238000005070 sampling Methods 0.000 claims description 9
- 230000005540 biological transmission Effects 0.000 claims description 6
- 230000003750 conditioning effect Effects 0.000 claims description 6
- 238000001514 detection method Methods 0.000 claims description 6
- 230000007246 mechanism Effects 0.000 claims description 5
- 230000010365 information processing Effects 0.000 claims description 4
- 230000035945 sensitivity Effects 0.000 claims description 4
- 238000013500 data storage Methods 0.000 claims description 3
- 238000007599 discharging Methods 0.000 claims description 3
- 239000013074 reference sample Substances 0.000 claims description 3
- 239000000523 sample Substances 0.000 claims description 3
- 238000006243 chemical reaction Methods 0.000 claims description 2
- 229910052573 porcelain Inorganic materials 0.000 claims description 2
- 230000003068 static effect Effects 0.000 claims description 2
- 238000004364 calculation method Methods 0.000 abstract description 3
- 238000004458 analytical method Methods 0.000 abstract description 2
- 230000008569 process Effects 0.000 description 3
- 230000003321 amplification Effects 0.000 description 2
- 230000008859 change Effects 0.000 description 2
- 239000000306 component Substances 0.000 description 2
- 230000007547 defect Effects 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 238000009413 insulation Methods 0.000 description 2
- 238000012423 maintenance Methods 0.000 description 2
- 239000002184 metal Substances 0.000 description 2
- 238000003199 nucleic acid amplification method Methods 0.000 description 2
- 230000011218 segmentation Effects 0.000 description 2
- 238000002679 ablation Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000008358 core component Substances 0.000 description 1
- 238000007405 data analysis Methods 0.000 description 1
- 238000013480 data collection Methods 0.000 description 1
- 238000013523 data management Methods 0.000 description 1
- 230000003111 delayed effect Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 239000000284 extract Substances 0.000 description 1
- 239000000835 fiber Substances 0.000 description 1
- 238000001914 filtration Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 229910052755 nonmetal Inorganic materials 0.000 description 1
- 239000013307 optical fiber Substances 0.000 description 1
- 230000011664 signaling Effects 0.000 description 1
- 238000012360 testing method Methods 0.000 description 1
Images
Classifications
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H7/00—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions
- H02H7/26—Sectionalised protection of cable or line systems, e.g. for disconnecting a section on which a short-circuit, earth fault, or arc discharge has occured
-
- H02J13/0017—
-
- 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
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
-
- 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
- Y04—INFORMATION OR COMMUNICATION TECHNOLOGIES HAVING AN IMPACT ON OTHER TECHNOLOGY AREAS
- 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
- Y04S10/20—Systems supporting electrical power generation, transmission or distribution using protection elements, arrangements or systems
-
- 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
- Y04—INFORMATION OR COMMUNICATION TECHNOLOGIES HAVING AN IMPACT ON OTHER TECHNOLOGY AREAS
- 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
- Y04S40/00—Systems for electrical power generation, transmission, distribution or end-user application management characterised by the use of communication or information technologies, or communication or information technology specific aspects supporting them
- Y04S40/12—Systems for electrical power generation, transmission, distribution or end-user application management characterised by the use of communication or information technologies, or communication or information technology specific aspects supporting them characterised by data transport means between the monitoring, controlling or managing units and monitored, controlled or operated electrical equipment
- Y04S40/124—Systems for electrical power generation, transmission, distribution or end-user application management characterised by the use of communication or information technologies, or communication or information technology specific aspects supporting them characterised by data transport means between the monitoring, controlling or managing units and monitored, controlled or operated electrical equipment using wired telecommunication networks or data transmission busses
-
- 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
- Y04—INFORMATION OR COMMUNICATION TECHNOLOGIES HAVING AN IMPACT ON OTHER TECHNOLOGY AREAS
- 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
- Y04S40/00—Systems for electrical power generation, transmission, distribution or end-user application management characterised by the use of communication or information technologies, or communication or information technology specific aspects supporting them
- Y04S40/12—Systems for electrical power generation, transmission, distribution or end-user application management characterised by the use of communication or information technologies, or communication or information technology specific aspects supporting them characterised by data transport means between the monitoring, controlling or managing units and monitored, controlled or operated electrical equipment
- Y04S40/126—Systems for electrical power generation, transmission, distribution or end-user application management characterised by the use of communication or information technologies, or communication or information technology specific aspects supporting them characterised by data transport means between the monitoring, controlling or managing units and monitored, controlled or operated electrical equipment using wireless data transmission
Landscapes
- Remote Monitoring And Control Of Power-Distribution Networks (AREA)
Abstract
The invention discloses a system for intelligently and accurately measuring in-situ excision protection of a ring main unit, wherein the ring main unit comprises a primary chamber and a secondary chamber; a current transformer and a voltage transformer are respectively additionally arranged on a distribution line and a switch line in a primary room; the current transformer and the voltage transformer transmit collected monitoring data to a controller in the secondary chamber, the ring main unit primary chamber monitoring sensor and the secondary chamber are connected through a data line, and a circuit breaker is arranged in the primary chamber. The invention has the advantages that: the current transformer and the voltage transformer transmit the collected monitoring data to the controller in the secondary chamber, and the data processing module of the controller performs calculation analysis on the collected data, so that the purpose of performing targeted processing on faults with different properties is achieved.
Description
Technical Field
The invention relates to the technical field of electrical equipment, in particular to a looped network cabinet intelligent and accurate measurement in-situ cutting protection system and an implementation method thereof.
Background
The Ring Main Unit (Ring Main Unit) is a group of electric equipment (high-voltage switch equipment) which is arranged in a metal or nonmetal insulating cabinet body or is made into an assembled interval Ring Main power supply Unit, and the core part of the Ring Main Unit adopts a load switch and a fuse, so that the Ring Main Unit has the advantages of simple structure, small volume, low price, capability of improving power supply parameters and performance, power supply safety and the like. The transformer substation is widely applied to distribution stations and box-type substations of load centers of urban residential districts, high-rise buildings, large public buildings, factory enterprises and the like.
At present, the feeder automation system scheme of the distribution network is mainly realized by reclosing, and the following schemes are provided:
a voltage type load switch is adopted to be matched with a feeder line outlet breaker switch for secondary reclosing, so that isolation of a permanent fault area is realized.
The traditional feeder automation mode has the characteristics of simple equipment configuration, no need of communication and high fault isolation success rate, but also has the following defects: each fault can cause the feeder outlet switch to trip; non-faulted segments can also cause power outages; the isolation fault needs the cooperation of multiple brake opening and closing of a feeder line outlet switch, so that multiple repeated power failure of a non-fault area and multiple impact on a system are caused; the time for isolating faults is long, and the sectional load switch needs to be switched on section by section in a delayed manner; and the remote monitoring control of feeder tide and switch working conditions cannot be realized.
Common intelligent protection modes of the power system include local control and remote control; the local control does not depend on remote communication, and depends on equipment such as fault identification and circuit breakers, so that the local identification and fault isolation are realized, the reliability is higher, but the unified management is difficult, and the fault maintenance work is more complicated. The remote control realizes the centralized management of the control station, realizes the functions of remote measurement, remote signaling, remote control and the like, is convenient and quick, but has higher dependence on a communication system and has lower stability than in-situ control.
Through retrieval, chinese patent CN 202435021U discloses a distribution network feeder automation fault isolation system, which can directly isolate short-circuit fault points by setting ring network switch stations on each node of a backbone network, and does not need tripping and reclosing of a breaker of a transformer substation, thereby realizing uninterrupted power supply, achieving the purpose of zero power failure, and enabling the distribution network system to have self-protection and self-healing capabilities of short-circuit fault. However, the system can only realize simple fault isolation and cannot realize targeted processing aiming at faults with different properties; in the prior art, an execution component in the ring main unit cannot be monitored, the execution component often has the conditions of 'operation rejection' and 'misoperation', and an execution command cannot be effectively executed, so that the fault is enlarged.
Disclosure of Invention
Aiming at the defects of the existing products, the invention provides the system for intelligently and accurately measuring the in-situ removal protection of the ring main unit and the implementation method thereof, wherein the system can cut off a fault line to ensure the normal work of other normal lines, collect fault data and classify and process faults.
The invention discloses a system for intelligently and accurately measuring in-situ excision protection of a ring main unit, wherein the ring main unit comprises a primary chamber and a secondary chamber; a current transformer and a voltage transformer are respectively additionally arranged on a distribution line and a switch line in a primary room; the current transformer and the voltage transformer transmit collected monitoring data to a controller in a secondary chamber, a primary chamber monitoring sensor of the ring main unit is connected with the secondary chamber through a data line, a circuit breaker is arranged in the primary chamber, a data processing module in the controller judges whether abnormal output occurs or not by comparing the phase current value of an output line with a set standard value, any phase current of the abnormal output line is larger than the set standard value, and the controller judges that the line is a fault line and calibrates and stores information of the fault line; the controller sends an instruction to the circuit breaker on the fault line, the circuit breaker on the fault line is isolated, other circuit breakers normally operate, faults of the output line are relieved through remote control or manual operation, the instruction is sent to the circuit breaker on the fault line to be switched on, and normal operation is recovered.
The current transformer and the voltage transformer are connected with a signal conditioning circuit through a wire, the signal conditioning circuit is electrically connected with a signal sampling module, the signal sampling module is connected with an SPI port of a main control chip, an I/O interface of the main control chip is connected with a switch optical coupling isolation module, the switch optical coupling isolation module controls an intelligent circuit breaker to realize switch-on, the switch optical coupling isolation module controls the intelligent circuit breaker to realize switch-on through a control circuit, and the main control chip is respectively connected with a Zigbee connection module, an Ethernet connection module, a GPRS connection module, an RS232 interface and an RS485 interface through a UART interface; the main control chip is also provided with a data storage module and a clock management module.
The main control chip adopts an RS232 interface and an RS485 interface to transmit the monitoring data in an asynchronous transmission communication mode.
Temperature and humidity sensors are arranged at a breaker contact, a flexible connection part and a cable joint in a primary chamber of the ring main unit; the temperature and humidity sensor is connected with a data interface of the main control chip through a data interface and outputs digital signals; the tail end connecting rod of each phase of the circuit breaker is connected with a vibration sensor through a magnetic mounting seat, and the vibration sensor is connected with a data interface of a main control chip through a data interface; install the sub cluster head node of several high frequency sensor and the integrated cluster head node of a high frequency sensor on the indoor SF6 gas tank inner wall of a time of looped netowrk cabinet, the sub cluster head node of high frequency sensor sends the acquisition signal for the integrated cluster head node of high frequency sensor, the integrated cluster head node data interface of high frequency sensor and main control chip's data interface connection, the integrated cluster head node of high frequency sensor is drawn forth from the SF6 gas tank through the sleeve pipe for the position and the intensity of discharging of monitoring SF6 gas tank.
An implementation method of an intelligent and accurate measurement in-situ cutting protection system of a ring main unit comprises the following steps:
step 2, a data processing module of the controller sends a control command to a switch optical coupling isolation module according to the calculated value, and the switch optical coupling isolation module controls the intelligent circuit breaker to realize switching on and switching off through a control circuit;
step 3, acquiring data by a temperature and humidity sensor, a high-frequency sensor, a vibration sensor, a current transformer, a voltage transformer and the like, and sending the data to a monitoring server through a communication module;
step 4, the main control chip sends the fault execution data to a monitoring server through a communication module, the monitoring server transmits the data to a monitoring database, and a remote monitoring platform is connected with the monitoring server through a data line; the remote monitoring platform collects, analyzes and manages protection action information, different types of faults, time and phase of occurrence of the faults, zero sequence current and voltage, information of action or abnormity of an operating mechanism and the like;
and 5, the remote monitoring platform sends information such as tripping, alarming, electrical parameters, state parameters, controller parameters, action records, channel conditions and the like to the mobile management terminal through the master station operation management module.
The controller compares the instantaneous zero-sequence current of the fault line with the zero-sequence current of the normal line under the condition of meeting the detection sensitivity of the fault line, extracts the maximum value of the instantaneous zero-sequence current for judgment, and the judgment formula is as follows:
(ii) a The above-mentioned
And the r-th data sampling value of the zero sequence current after the fault is obtained, wherein N is the total times.
The controller selects any one of the output lines to operateAnd respectively acquiring data information of other output lines for a sample line, calculating the positive and negative directions to determine whether the output lines are normal, wherein the judgment formula is as follows:
said
Is the R-th data acquisition value of the reference sample line, N is the total times,
the No. R data acquisition value of the No. Y output line is abnormal;
a value greater than zero indicates that the output line is normal,
less than zero indicates an abnormal output line.
The invention has the beneficial effects that:
(1) the current transformer and the voltage transformer transmit the collected monitoring data to the controller in the secondary chamber, and the data processing module of the controller performs calculation analysis on the collected data, so that the purpose of performing targeted processing on faults with different properties is achieved.
(2) The main control chip integrates various data interfaces, the realization of the automatic fault removal function of the circuit breaker is guaranteed, the safe and reliable operation of the ring main unit is guaranteed, and the smooth, reliable and safe transmission of information data is guaranteed, so that data signals are smoothly sent to the controller.
(3) The temperature and humidity sensor realizes monitoring of temperature and humidity in the ring main unit, and the high-frequency sensor realizes monitoring of SF6 gas box insulation state data; and finding out faults in advance and removing the faults.
(4) The controller controls the switch to timely remove a fault line, so that the protection of a power system is realized, and the power supply stability is improved; the intelligent control system can perform real-time overcurrent protection, current quick-break protection and zero sequence protection on a line, timely isolate a fault line, communicate with a GPRS network and a remote monitoring platform through an optical fiber channel, upload real-time electric power data and fault information, perform fault segmentation positioning, and meanwhile, perform close-range on-site control through a handheld mobile terminal, so that the organic combination of remote control and on-site control is realized.
Drawings
FIG. 1 is a schematic diagram of the use of the present invention;
FIG. 2 is a schematic diagram of the controller according to the present invention;
FIG. 3 is a flow chart of the operation of the remote monitoring platform of the present invention;
fig. 4 is a schematic structural view of the high-frequency sensor of the present invention.
Detailed Description
The invention is further described below with reference to the accompanying drawings.
As shown in fig. 1-4, a system for intelligent and precise measurement of on-site ablation protection for a ring main unit, the ring main unit includes a primary chamber and a secondary chamber; a current transformer and a voltage transformer are respectively additionally arranged on a distribution line and a switch line in a primary room; the current transformer and the voltage transformer transmit collected monitoring data to a controller in a secondary chamber, a primary chamber monitoring sensor of the ring main unit is connected with the secondary chamber through a data line, a breaker is arranged in the primary chamber, a data processing module in the controller judges whether abnormal output occurs or not by comparing each phase value of an output line with a set standard value, and information of a fault line is calibrated and stored; the controller sends an instruction to the circuit breaker on the fault line, the circuit breaker on the fault line is isolated, other circuit breakers normally operate, faults of the output line are relieved through remote control or manual operation, the instruction is sent to the circuit breaker on the fault line to be switched on, and normal operation is recovered.
An implementation method of an intelligent and accurate measurement in-situ cutting protection system of a ring main unit comprises the following steps:
step 2, a data processing module of the controller sends a control command to a switch optical coupling isolation module according to the calculated value, and the switch optical coupling isolation module controls the intelligent circuit breaker to realize switching on and switching off through a control circuit;
step 3, acquiring data by a temperature and humidity sensor, a high-frequency sensor, a vibration sensor, a current transformer, a voltage transformer and the like, and sending the data to a monitoring server through a communication module;
step 4, the main control chip sends the fault execution data to a monitoring server through a communication module, the monitoring server transmits the data to a monitoring database, and a remote monitoring platform is connected with the monitoring server through a data line; the remote monitoring platform collects, analyzes and manages protection action information, different types of faults, time and phase of occurrence of the faults, zero sequence current and voltage, information of action or abnormity of an operating mechanism and the like;
and 5, the remote monitoring platform sends information such as tripping, alarming, electrical parameters, state parameters, controller parameters, action records, channel conditions and the like to the mobile management terminal through the master station operation management module.
The data processing module in the controller judges the fault calculation method as follows:
the instantaneous zero sequence current value is judged, the controller compares the instantaneous zero sequence current of the fault line with the zero sequence current of the normal line under the condition of meeting the detection sensitivity on the fault line, the maximum value of the instantaneous zero sequence current is extracted for judgment, and the judgment formula is as follows:
(ii) a The above-mentioned
And the r-th data sampling value of the zero sequence current after the fault is obtained, wherein N is the total times.
Judging positive and negative directions, selecting any output line as a sample line by the controller, respectively acquiring data information of other output lines, and calculating the positive and negative directions to determineWhether the output line is normal or not is judged according to the following formula:
said
Is the R-th data acquisition value of the reference sample line, N is the total times,
the No. R data acquisition value of the No. Y output line is abnormal;
a value greater than zero indicates that the output line is normal,
less than zero indicates an abnormal output line.
The current transformer and the voltage transformer are connected with a signal conditioning circuit through a wire, the signal conditioning circuit is electrically connected with a signal sampling module, the signal sampling module is connected with an SPI port of a main control chip, an I/O interface of the main control chip is connected with a switch optical coupling isolation module, the switch optical coupling isolation module controls an intelligent circuit breaker to realize switch-on, the switch optical coupling isolation module controls the intelligent circuit breaker to realize switch-on through a control circuit, and the main control chip is respectively connected with a Zigbee connection module, an Ethernet connection module, a GPRS connection module, an RS232 interface and an RS485 interface through a UART interface; the main control chip is also provided with a data storage module and a clock management module. The main control chip is a core component of the controller, integrates various data interfaces, ensures the realization of the automatic fault removal function of the circuit breaker, and ensures the safe and reliable operation of the ring main unit.
The main control chip adopts an RS232 interface and an RS485 interface to transmit the monitoring data in an asynchronous transmission communication mode. In order to ensure the smooth, reliable and safe transmission of information data, if the RS232 interface output is disconnected, the optical modem sends the data through RS485 to form loop communication, so that the data signal is sent to the controller smoothly.
Temperature and humidity sensors are arranged at a breaker contact, a flexible connection part and a cable joint in a primary chamber of the ring main unit; the temperature and humidity sensor is connected with a data interface of the main control chip through a data interface and outputs wireless digital signals;
the tail end connecting rod of each phase of the circuit breaker is connected with a vibration sensor through a magnetic mounting seat, and the vibration sensor is connected with a data interface of a main control chip through a data interface; the vibration sensor can record according to the vibration conditions of switching on and switching off of the circuit breaker to form unique fault identification information for monitoring, analyzing and recording the operation condition of the circuit breaker; the occurrence of the conditions of 'operation refusal' and 'misoperation' of an execution part of the ring main unit control system in the operation process can be effectively solved, if the circuit breaker receives a command instruction sent by the controller, the vibration sensor monitors that the circuit breaker does not execute the command and then acts, the conditions of 'operation refusal' and 'misoperation' occur, the vibration sensor monitors that vibration information is fed back to the controller, and the controller is forcibly executed through the control circuit, so that the conditions of 'operation refusal' and 'misoperation' are avoided. The vibration sensor sends the monitored vibration signal to
The circuit breaker contact, flexible coupling department, the cable joint department of looped netowrk cabinet are key monitoring area, because under heavy current, highly compressed service condition, the resistance in monitoring area takes place undulantly, will lead to the temperature rise in monitoring area, in case the temperature rise in monitoring area, do not in time get rid of the damage that will lead to the circuit breaker, form the bad cycle.
Install the sub cluster head node of several high frequency sensor and the integrated cluster head node of a high frequency sensor on the indoor SF6 gas tank inner wall of a time of looped netowrk cabinet, the sub cluster head node of high frequency sensor sends the acquisition signal for the integrated cluster head node of high frequency sensor, the integrated cluster head node data interface of high frequency sensor and main control chip's data interface connection, the integrated cluster head node of high frequency sensor is drawn forth from the SF6 gas tank through the sleeve pipe for the position and the intensity of discharging of monitoring SF6 gas tank.
The SF6 gas tank is a totally sealed metal box body, and the high-frequency sensor is arranged inside the gas tank, so that the data acquisition efficiency can be improved, and the interference of external signals can be effectively avoided.
The data of the gas state of the SF6 gas box and the data of cable partial discharge collected by the high-frequency sensor integrated cluster head node are sent to a data interface of a main control chip, and the monitoring of the insulation state data of the SF6 gas box is realized.
The high-frequency sensor comprises an ultrahigh-frequency antenna for receiving ultrahigh-frequency electromagnetic wave signals sent by the ring main unit controller, and an Archimedes antenna with a built-in special-shaped reflection cavity with the frequency of 500MHz-1.5GMHz is selected; the ultrahigh frequency antenna is connected with a preamplifier circuit for improving the sensitivity of the ultrahigh frequency antenna, and the frequency of the preamplifier circuit is 500MHz-1.5 GMHz; the pre-amplification circuit is connected with a filter circuit used for filtering interference signals, the filter circuit is connected with a radio frequency detection circuit, and the radio frequency detection circuit is connected with a partial discharge detection signal through a phase-locked amplification circuit.
The system comprises a temperature and humidity sensor, a high-frequency sensor, a vibration sensor, a current transformer, a voltage transformer and the like, wherein the temperature and humidity sensor, the high-frequency sensor, the vibration sensor, the current transformer, the voltage transformer and the like acquire data and then send the data to a monitoring server through a communication module; the remote monitoring platform is provided with an information platform for collecting network fault information, and the information platform is provided with a fault information processing module, a local control management module and a master station operation management module.
The fault information processing module: after the line fault protection action, the fault field controller collects data and keeps the data in the monitoring database for three months; the data acquisition comprises the following steps: protection action information, different types of faults, time and phase types of faults, zero sequence current and voltage, and information of actions or abnormity of an operating mechanism; the equipment fault information provides action information for mechanical old mechanical current protection actions, and comprises power supply power failure time reporting, current secondary line and phase breaking reports, voltage secondary line and phase breaking reports and the like;
fault location information, which provides measured impedance conversion distance for accurate positioning and facilitates the search of hidden electrical equipment such as cables, insulated wires, porcelain bottles, lightning arresters and the like; the equipment measurement information comprises the high-resistance zero-sequence current direction, the equipment position coordinate and digital recording before and after the fault, so that the fault reason can be conveniently analyzed.
The local control management module: for the manager of the equipment, the mobile phone installs APP software which is remotely registered and authenticated, and for the local controller, the static password management mode is cancelled by using dynamic or remote authentication. And (4) operating authentication management, wherein the communication is normal, and authentication is performed in a dynamic two-dimensional code mode. For unsmooth communication, password authentication is performed between the controller and the controller through technologies such as Bluetooth (BT), Near Field Communication (NFC), Radio Frequency Identification (RFID), dynamic password and the like.
Protection parameter setting, in alternate protection, ground protection on the spot, to protection device on the spot, manage by control panel, realize the artifical type-in of protection definite value on the controller, also can carry out remote management.
The master station operation management module is a whole network equipment management center and is mainly used for completing data collection, analysis and management, and the specific implementation is as follows:
the mobile terminal registers, permits the maintenance of operators and management equipment owners, and inquires information of the operators after the equipment state is changed.
The master station pushes out a picture to give a distance measurement reference while pushing out a dynamic event, tripping and alarming; remote adjustment, namely, after the operation of a line connection switch and a station bus connection switch, the change of a system structure is caused, the hierarchical relation of each level is dynamically adjusted, and a fixed value cutting area is protected; remote data acquisition: and the appointed circuit breaker calling and testing comprises electrical parameters, state parameters, controller parameters, action records, channel conditions and the like, so that a remote calling function is realized.
The controller controls the switch to timely remove the fault line, so that the protection of the power system is realized, and the power supply stability is improved. The intelligent control system can perform real-time overcurrent protection, current quick-break protection and zero sequence protection on a line, timely isolate a fault line, communicate with a GPRS network through a fiber channel, upload real-time electric power data and fault information, perform fault segmentation positioning, and perform close-range local control through a handheld mobile terminal to realize organic combination of remote control and local control. The system has the complete in-situ fault recognition, positioning, removal and coincidence protection functions, ensures the stable operation of the power system, can realize power data transmission and manual instruction change through remote communication, and is convenient for a control center to monitor and manage.
The above description is only an embodiment of the present invention, and not intended to limit the scope of the present invention, and all modifications of equivalent structures and equivalent processes, which are made by the present specification, or directly or indirectly applied to other related technical fields, are included in the scope of the present invention.
Claims (2)
1. A looped network cabinet intelligent accurate measurement is system of excision protection on spot, the looped network cabinet includes primary chamber and secondary chamber; a current transformer and a voltage transformer are respectively additionally arranged on a distribution line and a switch line in a primary room; the ring main unit primary chamber monitoring sensor is connected with the secondary chamber through a data line, a circuit breaker is arranged in the primary chamber, a data processing module in the controller judges whether abnormal output occurs or not by comparing each phase value of an output line with a set standard value, the line is judged to be a fault line, and information of the fault line is calibrated and stored; the controller sends an instruction to a breaker on a fault line, the breaker on the fault line is isolated, other breakers run normally, faults of an output line are relieved through remote control or manual operation, the instruction is sent to the breaker on the fault line to be switched on, and normal running is recovered, wherein a vibration signal monitoring system is installed on the breaker and used for analyzing and judging an execution action instruction of the breaker; the current transformer and the voltage transformer are connected with a signal conditioning circuit through wires, the signal conditioning circuit is electrically connected with a signal sampling module, the signal sampling module is connected with an SPI port of a main control chip, an I/O interface of the main control chip is connected with a switch optical coupling isolation module, the switch optical coupling isolation module controls an intelligent circuit breaker to realize switch-on, the switch optical coupling isolation module controls the intelligent circuit breaker to realize switch-on through a control circuit, and the main control chip is respectively connected with a Zigbee connection module, an Ethernet connection module, a GPRS connection module, an RS232 interface and an RS485 interface through a UART interface; the main control chip is also provided with a data storage module and a clock management module; the main control chip adopts an RS232 interface and an RS485 interface to transmit the monitoring data in an asynchronous transmission communication mode;
temperature and humidity sensors are arranged at a breaker contact, a flexible connection part and a cable joint in a primary chamber of the ring main unit; the temperature and humidity sensor is connected with a data interface of the main control chip through a data interface and outputs digital signals; the tail end connecting rod of each phase of the circuit breaker is connected with a vibration sensor through a magnetic mounting seat, and the vibration sensor is connected with a data interface of a main control chip through a data interface; install the sub cluster head node of several high frequency sensor and the integrated cluster head node of a high frequency sensor on the indoor SF6 gas tank inner wall of a time of looped netowrk cabinet, the sub cluster head node of high frequency sensor sends the acquisition signal for the integrated cluster head node of high frequency sensor, the integrated cluster head node data interface of high frequency sensor and main control chip's data interface connection, the integrated cluster head node of high frequency sensor is drawn forth from the SF6 gas tank through the sleeve pipe for the position and the intensity of discharging of monitoring SF6 gas tank.
2. A realization method of an intelligent and accurate measurement in-situ cutting protection system of a ring main unit is characterized by comprising the following steps:
step 1, a current transformer and a voltage transformer send collected monitoring data to a controller in a secondary room, and a data processing module of a main control chip of the controller analyzes and judges the monitoring data; the data processing module analyzes and judges the monitoring data, the controller judges the instantaneous zero sequence current value under the condition of meeting the detection sensitivity on the fault line, the instantaneous zero sequence current of the fault line is compared with the zero sequence current of the normal line, the maximum value of the instantaneous zero sequence current is extracted for judgment, and the judgment formula is as follows:
(ii) a The above-mentioned
The r-th data sampling value of the zero sequence current after the fault is obtained, and N is the total times;
the data processing module analyzes and judges the monitoring data, judges the positive and negative directions, the controller selects any output line as a sample line, respectively collects data information of other output lines, calculates the positive and negative directions to determine whether the output line is normal, and the judgment formula is as follows:
said
Is the R-th data acquisition value of the reference sample line, N is the total times,
the No. R data acquisition value of the No. Y output line is abnormal;
a value greater than zero indicates that the output line is normal,
less than zero indicates that the output line is abnormal;
step 2, a data processing module of the controller sends a control command to a switch optical coupling isolation module according to the calculated value, and the switch optical coupling isolation module controls the intelligent circuit breaker to realize switching on and switching off through a control circuit;
step 3, collecting data of the temperature and humidity sensor, the high-frequency sensor, the vibration sensor, the current transformer and the voltage transformer, and sending the data to the monitoring server through the communication module;
step 4, the main control chip sends the fault execution data to a monitoring server through a communication module, the monitoring server transmits the data to a monitoring database, and a remote monitoring platform is connected with the monitoring server through a data line; the remote monitoring platform collects, analyzes and manages protection action information, different types of faults, time and phase of occurrence of the faults, zero sequence current and voltage, and action or abnormal information data of an operating mechanism;
the remote monitoring platform is provided with an information platform for collecting network fault information, and the information platform is provided with a fault information processing module, a local control management module and a master station operation management module;
the fault information processing module: after the line fault protection action, the fault field controller collects data and keeps the data in the monitoring database for three months; the data acquisition comprises the following steps: protection action information, different types of faults, time and phase types of faults, zero sequence current and voltage, and information of actions or abnormity of an operating mechanism; the equipment fault information provides action information for mechanical old mechanical current protection actions, and comprises power supply power failure time report, current secondary line break and phase break report and voltage secondary line break and phase break report;
fault location information, which provides measured impedance conversion distance for accurate positioning, and facilitates the searching of cables, insulated wires, porcelain bottles and lightning arresters, and the hidden electrical equipment; the equipment measurement information comprises high-resistance zero-sequence current direction, equipment position coordinates and digital recording before and after a fault, so that the fault reason can be conveniently analyzed;
the local control management module: for a manager of the equipment, the mobile phone installs APP software which is remotely registered and authenticated, and for a local controller, the static password management mode is cancelled by using dynamic or remote authentication; operating authentication management, wherein the communication is normal, and authentication is performed in a dynamic two-dimensional code mode; for unsmooth communication, password authentication is performed between the controller and the controller through Bluetooth (BT), Near Field Communication (NFC), Radio Frequency Identification (RFID) and dynamic passwords;
and 5, the remote monitoring platform sends information of tripping, alarming, electrical parameters, state parameters, controller parameters, action records and channel conditions to the mobile management terminal through the master station operation management module.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810281852.0A CN108347042B (en) | 2018-04-02 | 2018-04-02 | Ring main unit intelligent and accurate measurement in-situ removal protection system and implementation method thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810281852.0A CN108347042B (en) | 2018-04-02 | 2018-04-02 | Ring main unit intelligent and accurate measurement in-situ removal protection system and implementation method thereof |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN108347042A CN108347042A (en) | 2018-07-31 |
| CN108347042B true CN108347042B (en) | 2020-04-10 |
Family
ID=62956835
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201810281852.0A Active CN108347042B (en) | 2018-04-02 | 2018-04-02 | Ring main unit intelligent and accurate measurement in-situ removal protection system and implementation method thereof |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN108347042B (en) |
Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110896208B (en) * | 2019-11-29 | 2022-04-08 | 广东欧文特电气有限公司 | Intelligent load-limiting universal circuit breaker |
| CN113467358B (en) * | 2020-03-31 | 2022-06-28 | 宝山钢铁股份有限公司 | Portable intelligent synchronous close control device for hot rolling finishing line |
| CN114325151A (en) * | 2021-11-12 | 2022-04-12 | 国网浙江省电力有限公司平湖市供电公司 | Ring main unit fault acquisition method |
Family Cites Families (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN202940637U (en) * | 2012-10-23 | 2013-05-15 | 江苏南瑞帕威尔电气有限公司 | Power distribution automation intelligent terminal device |
| CN103245862A (en) * | 2013-05-08 | 2013-08-14 | 国家电网公司 | Condition monitoring system used for ring main unit of intelligent power distribution network |
| CN103969562A (en) * | 2014-05-29 | 2014-08-06 | 广州供电局有限公司 | Simulated partial discharge detection device for switch cabinet |
| CN206742847U (en) * | 2017-03-22 | 2017-12-12 | 珠海博威智能电网有限公司 | A kind of band in-situ protection station institute terminal device |
| CN107706891A (en) * | 2017-09-13 | 2018-02-16 | 湖南长高思瑞自动化有限公司 | A kind of integrated protection and monitoring device and method for ring main unit |
-
2018
- 2018-04-02 CN CN201810281852.0A patent/CN108347042B/en active Active
Also Published As
| Publication number | Publication date |
|---|---|
| CN108347042A (en) | 2018-07-31 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN108462255A (en) | A kind of cable high-voltage ring main unit monitor control system and its implementation | |
| CN102937675B (en) | The method of work of Real-time Electrical Distribution Network Data collection and fault location system | |
| CN106199341B (en) | Fault line identification method and device under single-phase fault grounding working condition | |
| CN108448724A (en) | A kind of the ring main unit control system and its implementation of Intellectual computer protection | |
| CN105093061A (en) | Power distribution network line fault on-line monitoring and alarming system | |
| CN108347042B (en) | Ring main unit intelligent and accurate measurement in-situ removal protection system and implementation method thereof | |
| CN106569089A (en) | Power distribution line dynamic Information-based power distribution network fault monitoring method | |
| CN107238774B (en) | State monitoring system for drop-out fuse | |
| CN111352028A (en) | Molded case circuit breaker and line loss analysis method | |
| CN102891533B (en) | A kind of 800kV intelligent breaker | |
| CN108132425A (en) | Power grid distribution line failure on-line monitoring method and system | |
| CN114609468B (en) | Cloud edge end cooperation-based single-phase earth fault interval distinguishing method for power distribution network | |
| CN110579693A (en) | High GIS partial discharge online monitoring device and method based on wireless transmission | |
| CN202870234U (en) | Online fault monitoring system for 10KV circuit | |
| CN111579917A (en) | Low-voltage distribution network fault positioning system and method | |
| CN201780348U (en) | Fault indicator and online line-fault monitoring system | |
| CN207799852U (en) | A kind of intelligent electric fire hazard monitoring early warning system | |
| CN212008850U (en) | Intelligent primary and secondary fused on-column circuit breaker | |
| CN203445696U (en) | Power distribution line online monitoring system | |
| CN210270548U (en) | Distribution box monitoring system based on wireless data transmission technology | |
| CN212483779U (en) | Moulded case circuit breaker device | |
| CN206132904U (en) | Novel wisdom fault indication system of 10kv circuit | |
| CN109412899A (en) | Concentrate receiving and displaying system | |
| CN201270385Y (en) | Intelligent synthetic electric distribution box | |
| CN210775721U (en) | Power distribution network cable fault on-line monitoring device based on transient residual current |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |