CN111999600B - Intelligent distribution network terminal secondary current loop fault diagnosis positioning method and system - Google Patents
Intelligent distribution network terminal secondary current loop fault diagnosis positioning method and system Download PDFInfo
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- CN111999600B CN111999600B CN202010861664.2A CN202010861664A CN111999600B CN 111999600 B CN111999600 B CN 111999600B CN 202010861664 A CN202010861664 A CN 202010861664A CN 111999600 B CN111999600 B CN 111999600B
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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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- 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
- G01R19/25—Arrangements for measuring currents or voltages or for indicating presence or sign thereof using digital measurement techniques
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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
- G01R31/50—Testing of electric apparatus, lines, cables or components for short-circuits, continuity, leakage current or incorrect line connections
- G01R31/52—Testing for short-circuits, leakage current or ground faults
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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
- 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
- Y04S10/50—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 discloses a fault diagnosis and positioning method and a system for a secondary current loop of an intelligent distribution network terminal, belonging to the field of fault location and detection of the secondary current loop of a distribution terminal, wherein the system comprises the following steps: the power supply plug-in unit is used for supplying power to the CPU plug-in unit, the first current amplifier plug-in unit and the second current amplifier plug-in unit; the current amplifier plug-in can output 6 intersected direct current signals, each current output channel can simulate alternating current and direct current signals with different amplitudes, simulation of sampling signals of a secondary current loop of the power distribution terminal is achieved, each current output channel has a current recovery function, and virtual connection faults of the secondary current loop of the power distribution terminal can be judged at the first time; and the CPU plug-in unit controls the current amplifier plug-in unit to flexibly output the amplitude, recover the current amplitude of each current output channel and position faults. The problem that various physical wiring faults such as virtual connection, short circuit and phase change of a secondary current loop of a power distribution terminal cannot be correctly distinguished, positioned and rapidly eliminated can be solved.
Description
Technical Field
The invention belongs to the field of power distribution terminal secondary current loop fault location detection, and particularly relates to a method and a system for diagnosing and locating a secondary current loop fault of an intelligent distribution network terminal.
Background
The distribution automation terminal is used as important equipment for distribution network automation, and the stability and reliability of the functions and the performance of the distribution automation terminal directly influence the electricity safety and the property safety of industry and residents. In order to realize the safety and reliability of the distribution network, no matter the factory detection of a power distribution terminal factory or the acceptance detection and annual scheduled inspection test of a power company, a large amount of manpower and material resources are required to be invested by related enterprises and units to carry out the detection test of the power distribution terminal.
At present, detection aiming at the power distribution terminal is mainly concentrated on the aspect of testing of single devices of the power distribution terminal, but because the quantity of power distribution stations, power distribution terminals and the like in each area is large, the workload of performing regular inspection on all the power distribution terminals every year is large, and the requirement of intelligent operation and maintenance of a national power grid company is not met. From the considerations of practicability, economy and safety, the method for eliminating the defects is mainly adopted to carry out operation and maintenance operation on most power distribution stations at present. When a power distribution station is found to have a fault, the problem is located through a related auxiliary testing tool of the power distribution terminal, the fault caused by the fault of the power distribution terminal body or the fault caused by the virtual connection of a return circuit is determined, and the purpose is to eliminate the defects and the faults, recover power supply and ensure the safety of a power distribution network. However, at present, the positioning of the body fault or the current loop fault corresponding to the power distribution terminal mainly depends on the mode of measuring the multimeter assisted by a current signal source to position the fault, the positioning efficiency is low, and a method or a system capable of realizing intelligent positioning of the current loop fault of the power distribution terminal is lacked.
Disclosure of Invention
Aiming at the defects or improvement requirements of the prior art, the invention provides a method and a system for diagnosing and positioning the secondary current loop fault of the intelligent distribution network terminal, which solve the problem that various physical wiring faults such as virtual connection, short circuit, phase commutation and the like of the secondary current loop of the distribution terminal cannot be correctly distinguished, positioned and quickly solved, and finally ensure that the distribution network can reliably and safely supply power.
In order to achieve the above object, according to an aspect of the present invention, there is provided an intelligent distribution network terminal secondary current loop fault diagnosis and location system, including: the power supply plug-in unit, the CPU plug-in unit, the first current amplifier plug-in unit and the second current amplifier plug-in unit;
the power supply plug-in provides a power supply and a driving power supply for the CPU plug-in, the first current amplifier plug-in and the second current amplifier plug-in;
the first current amplifier plug-in and the second current amplifier plug-in can both output 3 crossed direct current signals, each current output channel can simulate alternating current and direct current signals with different amplitudes, simulation of sampling signals of a secondary current loop of the power distribution terminal is achieved, each current output channel has a current back-sampling function, and virtual connection faults of the secondary current loop of the power distribution terminal can be judged;
the CPU plug-in is used for controlling the first current amplifier plug-in and the second current amplifier plug-in to carry out flexible amplitude output, current amplitude recovery of each current output channel and fault location.
Preferably, the CPU card includes: the device comprises a D/A conversion unit, a control unit, a logic calculation unit and a monitoring unit;
the D/A conversion unit is used for controlling the first current amplifier plug-in unit and the second current amplifier plug-in unit to carry out amplitude flexible output;
the control unit is used for controlling the current amplitude recovery of each current output channel of the first current amplifier plug-in unit and the second current amplifier plug-in unit and finding the virtual connection fault of a secondary current loop of the power distribution terminal in time;
the logic calculation unit is used for controlling the sending value, comparing the sending value with the recovery value and controlling the Ethernet interface to communicate with the power distribution terminal;
the monitoring unit is used for monitoring the first current amplifier plug-in unit and the second current amplifier plug-in unit so that fault protection test equipment can be timely removed when an internal fault occurs in a test system.
Preferably, the first current amplifier card comprises three single phase amplifiers; the second current amplifier card comprises three single phase amplifiers;
the output end of the power supply plug-in is respectively connected with the power supply ends of each single-phase amplifier in the first current amplifier plug-in and each single-phase amplifier in the second current amplifier plug-in;
the output end of the D/A conversion unit is respectively connected with the signal input end of each single-phase amplifier in the first current amplifier plug-in unit and the signal input end of each single-phase amplifier in the second current amplifier plug-in unit;
the output end of each single-phase amplifier in the first current amplifier plug-in unit and each single-phase amplifier in the second current amplifier plug-in unit outputs six-phase current.
According to another aspect of the invention, a method for diagnosing and positioning a fault of a secondary current loop of an intelligent distribution network terminal based on any one of the above is provided, and the method comprises the following steps:
each phase of the current output channel is connected with a secondary circuit of the power distribution terminal in a parallel shunt output mode, so that the current output channel is mapped with a sampling channel of the current circuit of the power distribution terminal according to the phase;
mapping a power distribution terminal current telemetry channel corresponding to the IEC104 master station client with a current output channel;
and analyzing and judging according to the self-extraction current amplitude of the current output channel and the actual sampling amplitude of each phase current sampling channel of the power distribution terminal, and judging the fault type of a secondary current loop of the power distribution terminal and the position of a fault joint.
Preferably, before analyzing and judging the type of the fault of the secondary current loop of the power distribution terminal and the position of the fault connection point according to the self-sampling current amplitude of the output channel and the actual sampling amplitude of each phase current sampling channel of the power distribution terminal, the method further comprises:
the fault diagnosis positioning system applies rated current In to the power distribution terminal In sequence according to the phase sequence A, the phase sequence B and the phase sequence C, the fault diagnosis positioning system recovers the amplitude condition of each circuit of current channel output by the fault diagnosis positioning system In real time, and meanwhile, the IEC104 main station acquires the current telemetering value sent to the main station background from the power distribution terminal In real time.
Preferably, the analyzing and judging according to the self-sampling current amplitude of the output channel and the actual sampling amplitude of each phase current sampling channel of the power distribution terminal, and determining the fault type of the secondary current loop of the power distribution terminal and the position of the fault contact, includes:
judging whether a secondary current loop of the power distribution terminal has a virtual connection fault according to a recovery value of a current output channel;
analyzing the current telemetering value acquired by the IEC104 master station, judging according to the current telemetering amplitude transmitted to the background on each phase, and determining whether the current loop of the detected phase has virtual connection, short circuit and phase change faults;
and judging the fault type of the actual secondary current loop and the position of the fault joint according to the current recovery amplitude and the current telemetering amplitude which is sent to the IEC104 main station.
Preferably, the determining whether the secondary current loop of the power distribution terminal has the virtual connection fault according to the extraction value of the current output channel includes:
and judging whether the stoping current value of each phase current output channel is In, and determining that the virtual connection fault occurs In the phase current loop channel when the stoping current value of any phase current output channel is not In.
Preferably, the analyzing the current telemetry value obtained by the IEC104 master station, determining whether the current loop of the detected phase has a virtual connection fault, a short circuit fault or a phase change fault according to the current telemetry amplitude sent to the background by each phase, includes:
judging whether the telemetering sampling values of all the phase current channels are 0 or not, and if the telemetering sampling values of all the phase current channels are 0, determining that the phase current loop channels have a ground short circuit fault and a virtual connection mixed fault;
if the telemetering sampling value of a certain target phase current channel is not 0, judging whether the telemetering value of the target phase current channel is In, if so, judging whether the telemetering value of other phase current channels is 0, if so, determining that the target phase current channel is normal, if not, judging whether the telemetering value of other phase current channels is In, if so, determining that the other phase current channels and the common end have a phase change fault, and if not, determining that the other phase current channels have a ground short circuit fault;
if the remote measuring value of the target phase current channel is not In, judging whether the remote measuring value of the target phase current channel is 0, if so, determining that the phase change fault occurs In the target phase current channel, if not, judging whether the remote measuring values of other phase current channels are not 0, if not, determining that the ground short circuit fault occurs In the target phase current channel, if not, judging whether the sum of the remote measuring values of the target phase current channel and the other phase current channels is In, if so, determining that the short circuit fault occurs In the target phase current channel and the other phase current channels, and if not, determining that the ground short circuit fault occurs In the target phase current channel and the other phase current channels.
According to another aspect of the invention, a computer-readable storage medium is provided, on which a computer program is stored which, when being executed by a processor, carries out the steps of the method of any of the above.
In general, compared with the prior art, the above technical solution contemplated by the present invention can achieve the following beneficial effects:
the closed-loop maintenance test of the whole secondary current loop of the power distribution terminal is realized, various faults such as virtual connection, short circuit and phase change of the secondary current loop of the power distribution terminal are effectively and accurately positioned under the coordination of a model prediction theory, operation and maintenance staff can find that the secondary current loop fault exists in the power distribution terminal in time, the quick elimination of the distribution network fault is realized, the on-site operation and maintenance efficiency of the power distribution network is greatly improved, and the safety and reliability of the distribution network are ensured.
Drawings
Fig. 1 is a schematic diagram of a fault diagnosis positioning system for a secondary current loop of an intelligent power distribution terminal according to an embodiment of the present invention;
fig. 2 is an application schematic diagram of a secondary current loop fault diagnosis positioning system of an intelligent power distribution terminal according to an embodiment of the present invention;
fig. 3 is a flow chart of a closed loop test of a current loop of a power distribution terminal according to an embodiment of the present invention;
fig. 4 is a logic flow diagram for diagnosing and positioning a fault of an overall secondary current loop of a power distribution terminal according to an embodiment of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is described in further detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention. In addition, the technical features involved in the embodiments of the present invention described below may be combined with each other as long as they do not conflict with each other.
In the present examples, "first", "second", etc. are used for distinguishing different objects, and are not necessarily used for describing a particular order or sequence.
The fault diagnosis and positioning system for the secondary current loop of the power distribution terminal completes diagnosis and positioning of various faults of virtual connection, short circuit, phase change and the like of the secondary current loop by means of a closed-loop automatic detection method through a control theory of analog prediction, and provides a basis for eliminating faults of the secondary current loop.
Example one
The system adopts a plug-in hardware technical scheme, and has 6 paths of current output channels, wherein the current output channels can simulate alternating current/direct current signals with different amplitudes to realize the simulation of sampling signals of a secondary current loop of the power distribution terminal, and the current output channels have a back-sampling function to realize the judgment of current virtual connection faults of the power distribution terminal; meanwhile, each phase of the current output channel is connected with a secondary circuit of the power distribution terminal in a parallel shunt output mode, so that the position of a specific fault contact of the power distribution terminal is judged.
Fig. 1 is a schematic diagram of a fault diagnosis and location system for a secondary current loop of an intelligent power distribution terminal according to an embodiment of the present invention, where the schematic diagram includes: the power supply plug-in unit, the CPU plug-in unit, the first current amplifier plug-in unit and the second current amplifier plug-in unit;
the power supply plug-in provides a power supply and a driving power supply for the CPU plug-in, the first current amplifier plug-in and the second current amplifier plug-in;
the first current amplifier plug-in and the second current amplifier plug-in can both output 3 intersecting direct current signals, each current output channel can simulate alternating current and direct current signals with different amplitudes, simulation of sampling signals of a secondary current loop of the power distribution terminal is achieved, each current output channel has a current back-sampling function, and virtual connection faults of the secondary current loop of the power distribution terminal can be judged at the first time;
and the CPU plug-in is used for controlling the first current amplifier plug-in and the second current amplifier plug-in to carry out flexible amplitude output, current amplitude recovery of each current output channel and fault positioning.
Further, the CPU card includes: the device comprises a D/A conversion unit, a control unit, a logic calculation unit and a monitoring unit;
the D/A conversion unit is used for controlling the first current amplifier plug-in unit and the second current amplifier plug-in unit to carry out amplitude flexible output;
the control unit is used for controlling the current amplitude recovery of each current output channel of the first current amplifier plug-in unit and the second current amplifier plug-in unit and finding the virtual connection fault of the secondary current loop of the power distribution terminal in time;
the logic calculation unit is used for controlling the sending value, comparing the sending value with the recovery value and controlling the Ethernet interface to communicate with the power distribution terminal;
the monitoring unit is used for monitoring the first current amplifier plug-in unit and the second current amplifier plug-in unit so that the fault protection test equipment can be timely removed when an internal fault occurs in the test system.
The control unit can be realized by an FPGA (field programmable gate array) on hardware, and the logic calculation unit can be realized by an ARM (advanced RISC machine) on hardware.
Further, the first current amplifier card comprises three single-phase amplifiers; the second current amplifier card comprises three single-phase amplifiers;
the output end of the power supply plug-in is respectively connected with the power supply ends of each single-phase amplifier in the first current amplifier plug-in and each single-phase amplifier in the second current amplifier plug-in;
the output end of the D/A conversion unit is respectively connected with the signal input end of each single-phase amplifier in the first current amplifier plug-in unit and the signal input end of each single-phase amplifier in the second current amplifier plug-in unit;
the output end of each single-phase amplifier in the first current amplifier plug-in unit and each single-phase amplifier in the second current amplifier plug-in unit outputs six-phase current.
Example two
When the test is carried out, an automatic maintenance model is established by utilizing a closed-loop automatic test principle, a secondary circuit of the power distribution terminal is tested, a current output channel of a hardware system is mapped with a current circuit of the power distribution terminal by adopting a channel according to phase difference, a current remote measurement channel of the power distribution terminal corresponding to a client side of a main station of an IEC104 software system is mapped with the current output channel of the hardware system, and finally, the amplitude values of the current circuit channel of the power distribution terminal and the current output channels of different phases of the test system are subjected to closed-loop automatic comparison.
A prediction model is constructed on the basis of a closed-loop automatic test principle by utilizing a model prediction theory, comprehensive analysis and judgment are carried out according to the self-extraction current amplitude of an output channel of a test system and the actual sampling amplitude of each phase current sampling channel of the power distribution terminal, various fault types of virtual connection, short circuit, phase change and the like of a secondary current loop of the power distribution terminal and the positions of fault connection points are judged, and finally, the fault of the secondary current loop of the power distribution terminal is correctly eliminated.
Fig. 3 is a flowchart illustrating a closed-loop test of a current loop of a power distribution terminal according to an embodiment of the present invention, including:
s1: each phase of the current output channel is connected with a secondary circuit of the power distribution terminal in a parallel shunt output mode, and the current output channel is mapped with a sampling channel of the current circuit of the power distribution terminal according to the phase;
s2: mapping a power distribution terminal current telemetering channel and a current output channel corresponding to the IEC104 master station client;
s3: and analyzing and judging according to the self-sampling current amplitude of the output channel and the actual sampling amplitude of each phase current sampling channel of the power distribution terminal, and judging the fault type of a secondary current loop of the power distribution terminal and the position of a fault joint.
Specifically, as shown in fig. 1, a hardware portion in the fault diagnosis positioning system is implemented by using a distributed plug-in structure, and is composed of a power supply plug-in, a CPU plug-in, 2 current amplifier plug-ins, and the like. The power supply plug-in provides a power supply and a driving power supply for the CPU plug-in and the current amplifier plug-in; the current amplifier plug-in can output 3 intersected direct current signals, each current output channel has a current recovery function, and the virtual connection fault of a secondary current loop of the power distribution terminal can be judged at the first time; the CPU plug-in is composed of a DA conversion module, an FPGA, an ARM and a monitoring unit, the DA conversion module controls a current amplifier plug-in to carry out amplitude flexible output, the FPGA control module controls current amplitude recovery of a current output channel of the current amplifier plug-in, virtual connection faults of a secondary current loop of a power distribution terminal are found in time, the ARM carries out related logic calculation and controls an Ethernet interface to carry out IEC104 communication with the power distribution terminal, the recovery value of current input is finally transmitted to the monitoring unit through the ARM, the monitoring unit carries out discriminant analysis, when a test system hardware sends faults, the monitoring unit cuts off current output in time, monitoring on the current amplifier plug-in is achieved, and fault protection test equipment can be cut off in time when the test system has internal faults.
As shown in fig. 2, when performing a test, it is necessary to perform a connection with a distribution terminal, where A1/B1/C1 is a system current output terminal, N1 is a current input terminal, the positions of the contacts 1, 2, 3, and 4 in fig. 2 of ABCN are actual application wiring positions of the distribution terminal on site, and the diagnostic system is connected to the system through the contacts 1 and 2 instead of a CT transformer on site. The method comprises the following specific steps:
the 6 current output channels are respectively output, each phase is formed by connecting two current channels in parallel and outputting at the same frequency, three-phase current outputs A, B and C are formed (Ia 1 and Ia2 of a system corresponding to A, ib1 and Ib2 of a system corresponding to B and Ic1 and Ic2 of a system corresponding to C), and the two currents of each phase are respectively connected to different positions of a secondary current loop of the power distribution terminal, so that support is provided for distinguishing and positioning fault types. Meanwhile, a current output channel of the diagnosis system is directly and physically connected with an integral secondary current loop of the power distribution terminal at the secondary side of the CT according to phases, phase current acquisition of the power distribution terminal A, B and C replaces phase CT transformers at a connection point 1 and a connection point 2 in a parallel input mode, and a mapping relation between the current output channel of the diagnosis system and a current loop acquisition channel of the power distribution terminal is constructed; the method comprises the steps that an IEC104 main station client side actively obtains a current remote measurement value of a power distribution terminal, a power distribution terminal current remote measurement channel is mapped with a diagnosis system current output channel, phase A, phase B and phase C connection lines in an IEC104 main station are mapped with phase A, phase B and phase C remote measurement in the IEC104 main station respectively, mapping of a current channel input to the power distribution terminal by a diagnosis system and power distribution terminal remote measurement current transmitted to the IEC104 main station is finally achieved, a power distribution terminal current sampling and up-transmission closed loop comparison model is built, therefore, closed loop test of a power distribution terminal current loop is achieved, and data support is provided for integral secondary loop current fault diagnosis and positioning of the power distribution terminal.
Further, as shown In fig. 4, the system sequentially applies rated current In to the power distribution terminal according to the phase sequence a, B, and C, the system itself recovers the amplitude condition of each circuit of current channel output by itself In real time, and the IEC104 master station acquires the current telemetry value sent to the master station background from the power distribution terminal In real time. Establishing a preset criterion in advance according to a prediction model, and judging whether a secondary current loop of a power distribution terminal has a virtual connection fault or not according to a recovery value of a current output channel; secondly, analyzing the current telemetering value obtained by the IEC104 main station, carrying out comprehensive logic judgment according to the current telemetering amplitude transmitted to the background on each phase, and determining whether various faults such as virtual connection, short circuit, phase commutation and the like occur in the current loop of the detected phase; secondly, summarizing fault judgment results, and judging the fault type of an actual secondary current loop and the position of a fault joint according to the current recovery amplitude of the system and the current telemetering amplitude of the IEC104 main station; and finally, performing a round of closed loop judgment and diagnosis on all current loops in sequence, confirming the loop fault type and the fault joint position, and automatically generating a related fault diagnosis detection report.
Specifically, whether the secondary current loop of the power distribution terminal has a virtual connection fault is judged according to the extraction value of the current output channel, and the method comprises the following steps:
and judging whether the stoping current value of each phase current output channel is In, and determining that the virtual connection fault occurs In the phase current loop channel when the stoping current value of any phase current output channel is not In.
Specifically, analyzing the current telemetry value obtained by the IEC104 master station, determining whether the current loop of the detected phase has a virtual connection fault, a short circuit fault or a phase change fault according to the current telemetry amplitude sent to the background on each phase, and including:
judging whether the telemetering sampling values of all the phase current channels are 0 or not, and if the telemetering sampling values of all the phase current channels are 0, determining that the phase current loop channels have a ground short circuit fault and a virtual connection mixed fault;
if the telemetering sampling value of a certain target phase current channel is not 0, judging whether the telemetering value of the target phase current channel is In, if so, judging whether the telemetering value of other phase current channels is 0, if so, determining that the target phase current channel is normal, if not, judging whether the telemetering value of other phase current channels is In, if so, determining that the other phase current channels and the common end have a phase change fault, and if not, determining that the other phase current channels have a ground short circuit fault;
if the remote measuring value of the target phase current channel is not In, judging whether the remote measuring value of the target phase current channel is 0, if so, determining that the phase change fault occurs In the target phase current channel, if not, judging whether the remote measuring values of other phase current channels are not 0, if not, determining that the ground short circuit fault occurs In the target phase current channel, if not, judging whether the sum of the remote measuring values of the target phase current channel and the other phase current channels is In, if so, determining that the short circuit fault occurs In the target phase current channel and the other phase current channels, and if not, determining that the ground short circuit fault occurs In the target phase current channel and the other phase current channels.
EXAMPLE III
The application also provides a computer readable storage medium, such as a flash memory, a hard disk, a multimedia card, a card type memory (e.g., SD or DX memory, etc.), a Random Access Memory (RAM), a Static Random Access Memory (SRAM), a Read Only Memory (ROM), an Electrically Erasable Programmable Read Only Memory (EEPROM), a Programmable Read Only Memory (PROM), a magnetic memory, a magnetic disk, an optical disk, a server, an App application mall, etc., on which a computer program is stored, and when the program is executed by a processor, the method for diagnosing and locating the fault of the secondary current loop of the intelligent distribution network terminal in the method embodiment is implemented.
It should be noted that, according to the implementation requirement, each step/component described in the present application can be divided into more steps/components, and two or more steps/components or partial operations of the steps/components can be combined into new steps/components to achieve the purpose of the present invention.
It will be understood by those skilled in the art that the foregoing is only a preferred embodiment of the present invention, and is not intended to limit the invention, and that any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the scope of the present invention.
Claims (8)
1. A method based on a fault diagnosis and positioning system for a secondary current loop of an intelligent distribution network terminal comprises the following steps: the power supply plug-in unit, the CPU plug-in unit, the first current amplifier plug-in unit and the second current amplifier plug-in unit; the power supply plug-in provides a power supply and a driving power supply for the CPU plug-in, the first current amplifier plug-in and the second current amplifier plug-in; the first current amplifier plug-in and the second current amplifier plug-in can both output 3 crossed direct current signals, each current output channel can simulate alternating current and direct current signals with different amplitudes, simulation of sampling signals of a secondary current loop of the power distribution terminal is achieved, each current output channel has a current back-sampling function, and virtual connection faults of the secondary current loop of the power distribution terminal can be judged; the CPU plug-in is used for controlling the first current amplifier plug-in and the second current amplifier plug-in to carry out amplitude flexible output, current amplitude recovery and fault location of each current output channel, and the method is characterized by comprising the following steps:
each phase of the current output channel is connected with a secondary circuit of the power distribution terminal in a parallel shunt output mode, so that the current output channel is mapped with a sampling channel of the current circuit of the power distribution terminal according to the phase;
mapping a power distribution terminal current telemetering channel and a current output channel corresponding to the IEC104 master station client;
and analyzing and judging according to the self-extraction current amplitude of the current output channel and the actual sampling amplitude of each phase current sampling channel of the power distribution terminal, and judging the fault type of a secondary current loop of the power distribution terminal and the position of a fault joint.
2. The method of claim 1, wherein before the analyzing and determining according to the self-sampled current amplitude of the current output channel and the actual sampled amplitude of each phase current sampling channel of the power distribution terminal to determine the fault type of the secondary current loop of the power distribution terminal and the location of the fault contact, the method further comprises:
the fault diagnosis positioning system applies rated current In to the power distribution terminal In sequence according to the phase sequence A, the phase sequence B and the phase sequence C, the fault diagnosis positioning system recovers the amplitude condition of each circuit of current channel output by the fault diagnosis positioning system In real time, and meanwhile, the IEC104 main station acquires the current telemetering amplitude transmitted to the main station background on the power distribution terminal In real time.
3. The method of claim 2, wherein the analyzing and judging according to the self-sampled current amplitude of the current output channel and the actual sampled amplitude of each phase current sampling channel of the power distribution terminal to determine the fault type of the secondary current loop of the power distribution terminal and the position of the fault connection point comprises:
judging whether a secondary current loop of the power distribution terminal has a virtual connection fault according to the recovery value of the current output channel;
analyzing the current telemetering amplitude obtained by the IEC104 master station, judging according to the current telemetering amplitude sent to the background on each phase, and determining whether the current loop of the detected phase has virtual connection, short circuit and phase change faults;
and judging the fault type of the actual secondary current loop and the position of the fault joint according to the current recovery amplitude and the current telemetering amplitude which is sent to the IEC104 main station.
4. The method according to claim 3, wherein the determining whether the virtual connection fault occurs in the secondary current loop of the power distribution terminal according to the sampled value of the current output channel comprises:
and judging whether the stoping current value of each phase current output channel is In, and determining that the virtual connection fault occurs In the phase current loop channel when the stoping current value of any phase current output channel is not In.
5. The method of claim 3, wherein the analyzing the current telemetry amplitude obtained by the IEC104 master station, determining whether the current loop of the phase to be tested has a virtual connection, a short circuit, or a phase change fault according to the current telemetry amplitude sent to the background on each phase, comprises:
judging whether the current telemetering amplitude values of all the phase current channels are 0 or not, and if the current telemetering amplitude values of all the phase current channels are 0, determining that the ground short circuit fault and the virtual connection mixed fault occur in each phase current loop channel;
if the current telemetering amplitude values of all the phase current channels are not 0, judging whether the current telemetering amplitude value of a certain target phase current channel is In, if so, judging whether the current telemetering amplitude values of other phase current channels are 0, if so, determining that the target phase current channel is normal, if not, judging whether the current telemetering amplitude values of other phase current channels are In, if so, determining that phase change faults occur between other phase current channels and a public end, and if not, determining that the other phase current channels have ground short circuit faults;
if the current telemetering amplitude of the target phase current channel is not In, judging whether the current telemetering amplitude of the target phase current channel is 0, if so, determining that the phase change fault occurs In the target phase current channel, if not, judging whether the current telemetering amplitudes of other phase current channels are not 0, if not, determining that the ground short circuit fault occurs In the target phase current channel, if not, judging whether the sum of the current telemetering amplitudes of the target phase current channel and the other phase current channels is In, if so, determining that the short circuit fault occurs In the target phase current channel and the other phase current channels, and if not, determining that the ground short circuit fault occurs In the target phase current channel and the other phase current channels.
6. The method of claim 1, wherein the CPU plug-in comprises: the device comprises a D/A conversion unit, a control unit, a logic calculation unit and a monitoring unit;
the D/A conversion unit is used for controlling the first current amplifier plug-in unit and the second current amplifier plug-in unit to carry out amplitude flexible output;
the control unit is used for controlling the current amplitude recovery of each current output channel of the first current amplifier plug-in unit and the second current amplifier plug-in unit so as to find the virtual connection fault of the secondary current loop of the power distribution terminal;
the logic calculation unit is used for controlling the sending value, comparing the sending value with the recovery value and controlling the Ethernet interface to communicate with the power distribution terminal;
the monitoring unit is used for monitoring the first current amplifier plug-in unit and the second current amplifier plug-in unit so as to cut off fault protection test equipment when an internal fault occurs in a test system.
7. The method of claim 6, wherein the first current amplifier card comprises three single phase amplifiers; the second current amplifier card comprises three single phase amplifiers;
the output end of the power supply plug-in is respectively connected with the power supply ends of each single-phase amplifier in the first current amplifier plug-in and each single-phase amplifier in the second current amplifier plug-in;
the output end of the D/A conversion unit is respectively connected with the signal input end of each single-phase amplifier in the first current amplifier plug-in unit and the signal input end of each single-phase amplifier in the second current amplifier plug-in unit;
the output end of each single-phase amplifier in the first current amplifier plug-in unit and each single-phase amplifier in the second current amplifier plug-in unit outputs six-phase current.
8. A computer-readable storage medium, on which a computer program is stored, which, when being executed by a processor, carries out the steps of the method of any one of claims 1 to 7.
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| CN115754881B (en) * | 2023-01-04 | 2023-04-25 | 武汉格蓝若智能技术股份有限公司 | Virtual connection judging method and device for secondary side loop of voltage transformer |
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| CN2562195Y (en) * | 2002-04-22 | 2003-07-23 | 重庆龙源科技产业发展有限公司 | Anomalous running measuring and recording instrument for intellectual network kilowatt meter |
| CN102331757B (en) * | 2011-07-13 | 2012-11-07 | 上海毅昊自动化有限公司 | Online detecting system and detecting method for outlet circuit of non-electric quantity protective device |
| CN103743966B (en) * | 2013-11-26 | 2017-01-18 | 广东威灵电机制造有限公司 | PWM module detection method and system in motor driver |
| CN105259476B (en) * | 2015-11-04 | 2018-07-06 | 海南电力技术研究院 | The detection method and system of distribution network line fault alignment system |
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| CN108089119B (en) * | 2017-11-17 | 2021-01-29 | 国网湖南省电力有限公司 | Secondary circuit electrification detection method and system for relay protection secondary equipment of transformer substation |
| CN109831034A (en) * | 2018-11-14 | 2019-05-31 | 国网新疆电力有限公司奎屯供电公司 | A kind of protection equipment on-line monitoring of intelligent substation and diagnostic device |
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