CN108693442A - The detection method and system of electric network fault - Google Patents
The detection method and system of electric network fault Download PDFInfo
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- CN108693442A CN108693442A CN201810470688.8A CN201810470688A CN108693442A CN 108693442 A CN108693442 A CN 108693442A CN 201810470688 A CN201810470688 A CN 201810470688A CN 108693442 A CN108693442 A CN 108693442A
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- against ground
- insulation against
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/08—Locating faults in cables, transmission lines, or networks
- G01R31/081—Locating faults in cables, transmission lines, or networks according to type of conductors
- G01R31/086—Locating faults in cables, transmission lines, or networks according to type of conductors in power transmission or distribution networks, i.e. with interconnected conductors
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- 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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- Testing Of Short-Circuits, Discontinuities, Leakage, Or Incorrect Line Connections (AREA)
Abstract
The invention discloses a kind of detection method of electric network fault and systems, it is related to technical field of electric power detection, main purpose is after solving to occur for short trouble and singlephase earth fault, it is required for artificial line walking to search fault point, the problem of taking a significant amount of time on searching fault point, and the unexpected injury of personnel will also result in for the detection of high-voltage electricity.Including:The high voltage leg voltage that the three-phase alternating current acquired on test point position is converted to voltage stabilization is combined with LC filtering by EMI filtering;The high voltage leg voltage is delivered to after voltage transformer and is converted to alternating voltage, and the first voltage signal as voltage acquisition signal, and the second voltage signal as power supply are decomposed by inductor voltage regulator;Using balance bridge and uneven bridge switching mode, the insulation against ground state of the busbar of test point is determined according to the high voltage leg voltage of the test point acquired in real time, the insulation against ground state is sent in electric network fault server.
Description
Technical field
The present invention relates to technical field of electric power detection more particularly to the detection methods and system of a kind of electric network fault.
Background technology
With the fast development of intelligent grid, the power supply capacity and power supply quality of intelligent grid have become electric power enterprise and sentence
The leading indicator of disconnected economic benefit.In the network that distribution is connected with user terminal, fault detect, which just becomes, influences the most main of power supply
Want factor.
Currently, due to the distribution line complicated network structure, easily by external force and natural environment influence, for short trouble and list
After phase earth fault occurs, artificial line walking is required for search fault point, taken a significant amount of time on searching fault point, and for height
The detection of piezoelectricity will also result in the unexpected injury of personnel, not only waste time and affect to repair fault point and restore electric power to damage
It loses.
Invention content
In view of the above problems, it is proposed that the present invention overcoming the above problem in order to provide one kind or solves at least partly
State the detection method and system of the electric network fault of problem.
In order to achieve the above objectives, present invention generally provides following technical solutions:
On the one hand, the present invention provides a kind of detection methods of electric network fault, including:
It is combined with LC filtering by EMI filtering and the three-phase alternating current acquired on test point position is converted into voltage stabilization
High voltage leg voltage, the test point are the fault detecting point in the network system of double charging double cell compositions;
The high voltage leg voltage is delivered to after voltage transformer and is converted to alternating voltage, and is adjusted by induced voltage
Device is decomposed into the first voltage signal as voltage acquisition signal, and as the second voltage signal of power supply, first electricity
Pressure signal is used to be delivered to the abnormal conditions that current electric grid system is detected in electric network fault server after A/D digital-to-analogue conversions,
The second voltage signal provides electric energy for current electric grid fault detection system;
Using balance bridge and uneven bridge switching mode, is determined and examined according to the high voltage leg voltage of the test point acquired in real time
The insulation against ground state is sent in electric network fault server, so as to the electricity by the insulation against ground state of the busbar of measuring point
Net failed server carries out judging whether to early warning.
On the other hand, the present invention provides a kind of detecting systems of electric network fault, including:Management module, power supply take electric mould
Block, acquisition module,
The management module is connected with the power supply electricity-fetching module, for that will be examined by EMI filtering and LC filtering combinations
The three-phase alternating current acquired on point position is converted to the high voltage leg voltage of voltage stabilization, and the test point is the double electricity of double chargings
Fault detecting point in the network system of pond composition;
The power supply electricity-fetching module is connected with the acquisition module, the high pressure branch for receiving the management module transmission
Line voltage, and the high voltage leg voltage is delivered to after voltage transformer and is converted to alternating voltage, and pass through induced voltage
Adjuster is decomposed into the first voltage signal as voltage acquisition signal, and as the second voltage signal of power supply, and described
One voltage signal is used to be delivered to the abnormal feelings that current electric grid system is detected in electric network fault server after A/D digital-to-analogue conversions
Condition, the second voltage signal provide electric energy for current electric grid fault detection system;
The acquisition module is connected with the power supply electricity-fetching module, the height for receiving the power supply electricity-fetching module transmission
Branch line voltage is pressed, and using balance bridge and uneven bridge switching mode, according to the high voltage leg voltage of the test point acquired in real time
The insulation against ground state is sent in electric network fault server by the insulation against ground state for determining the busbar of test point, so as to
The electric network fault server carries out judging whether to early warning.
The detection method and system of a kind of electric network fault provided by the invention will be examined by EMI filtering and LC filtering combinations
The three-phase alternating current acquired on point position is converted to the high voltage leg voltage of voltage stabilization, and the test point is the double electricity of double chargings
Fault detecting point in the network system of pond composition;The high voltage leg voltage is delivered to after voltage transformer and is converted to exchange
Voltage, and it is decomposed into the first voltage signal as voltage acquisition signal by inductor voltage regulator, and as power supply
Second voltage signal, the first voltage signal are detected for being delivered to after A/D digital-to-analogue conversions in electric network fault server
The abnormal conditions of current electric grid system, the second voltage signal provide electric energy for current electric grid fault detection system;Using flat
Heng Qiao and uneven bridge switching mode, pair of the busbar of test point is determined according to the high voltage leg voltage of the test point acquired in real time
The insulation against ground state is sent in electric network fault server by ground state of insulation, so as to the electric network fault server into
Row judges whether to early warning, realizes the accurate high-voltage electricity bypass position for determining failure and occurring, improves the exclusion efficiency of failure, greatly
It is big to improve power supply reliability, quantity and the hunting time of failure track walker are reduced, working efficiency is largely improved.
Description of the drawings
By reading the detailed description of hereafter preferred embodiment, various other advantages and benefit are common for this field
Technical staff will become clear.Attached drawing only for the purpose of illustrating preferred embodiments, and is not considered as to the present invention
Limitation.And throughout the drawings, the same reference numbers will be used to refer to the same parts.In the accompanying drawings:
Fig. 1 is a kind of detection method flow chart of electric network fault provided in an embodiment of the present invention;
Fig. 2 is a kind of network system structural schematic diagram to be detected provided in an embodiment of the present invention;
Fig. 3 is the high voltage leg voltage flow that a kind of three-phase alternating current provided in an embodiment of the present invention is converted to voltage stabilization
Schematic diagram;
Fig. 4 is a kind of detecting system block diagram of electric network fault provided in an embodiment of the present invention;
Fig. 5 is the detecting system block diagram of another electric network fault provided in an embodiment of the present invention;
Specific implementation mode
The exemplary embodiment of the disclosure is more fully described below with reference to accompanying drawings.Although showing the disclosure in attached drawing
Exemplary embodiment, it being understood, however, that may be realized in various forms the disclosure without should be by embodiments set forth here
It is limited.On the contrary, these embodiments are provided to facilitate a more thoroughly understanding of the present invention, and can be by the scope of the present disclosure
Completely it is communicated to those skilled in the art.
The advantages of to make technical solution of the present invention, is clearer, makees specifically to the present invention with reference to the accompanying drawings and examples
It is bright.
An embodiment of the present invention provides a kind of detection methods of electric network fault, as shown in Figure 1, the method includes:
101, it is filtered by EMI steady in conjunction with the three-phase alternating current acquired on test point position is converted to voltage with LC filtering
Fixed high voltage leg voltage.
Wherein, the test point is the fault detecting point in the network system of double charging double cell compositions, the EMI filtering
Combined with LC filtering refers to by rectification, inversion and power regulation, the power frequency AC of outputting high quality, to obtain surely
Fixed voltage to be detected.In the embodiment of the present invention, three-phase alternating-current supply can be collected from fault detecting point, is then passed through
EMI is filtered to be filtered to obtain the high voltage leg voltage of voltage stabilization with LC.
It should be noted that using dual-host backup, such electricity in the network system formed due to double charging double cells
For net system suitable for the power plant for the power generation that cannot have a power failure for a long time, substation, therefore, it is necessary to the detections of electric network fault not to limit to
In some element or device, but will be to the monitoring of the whole network status information of wide area.In addition, by the electricity detected in this present embodiment
Net is the large-scale modernization electrical network facilities of a dynamic, real-time information and electric power interaction, and therefore, fault detecting point can be set
It is set to the branch location of the branch of every power grid, to be examined to the branch for more being possible to generate failure and abnormal voltage
It surveys.
For the embodiment of the present invention, in order to be refined to step 101, step 101 specifically includes:Test point is adopted on position
The three-phase alternating current of collection filters the input of input and the pulsewidth modulation respectively as industrial frequency rectifying by EMI;By the work
Three-phase alternating current after frequency rectification respectively after PFC power factors, the frequency conversion of DC/AC high frequencies, high-voltage frequency converter, LC filtering, then
Input of the secondary result for carrying out EMI filtering outputs as the pulse-width adjustment, modulated result feed back to the DC/AC high frequencies
In frequency conversion, the exchange to form closed loop detects;It will be made by exchanging the result detected and by the filtering outputs of EMI again
For the high voltage leg voltage of voltage stabilization.
For in the embodiment of the present invention, in order to which rectification goes out glitch-free voltage from alternating current, to be detected, acquiring
The input that is filtered as EMI of three-phase alternating current, filtered output valve is in the input as industrial frequency rectifying, and exchange detection
The input of pulse-width adjustment in the process, as shown in Fig. 2, the voltage after rectification is handed over pulsation by inactivity factor correction pfc circuit
Circulation is changed to stable power supply, and exchange is converted to high-frequency ac power, also, DC/AC high frequency conversions by DC/AC high frequency transformers
Circuit under the control of pulse-width modulation PWM circuit by adjusting the pulse width of translation circuit, then, by high-voltage frequency converter with
And LC filtering, EMI filter the power supply exported, the high voltage leg voltage of fault detecting point as to be detected.In addition, last
The input of pulse-width adjustment pwm circuit, DC/AC is fed back to by modulated pulse width during out-put supply will also be detected as exchange
In high frequency transformer, to realize that stablizing for high voltage leg voltage exports.
102, the high voltage leg voltage is delivered to after voltage transformer and is converted to alternating voltage, and pass through induced voltage
Adjuster is decomposed into the first voltage signal as voltage acquisition signal, and the second voltage signal as power supply.
Wherein, the first voltage signal is detected for being delivered to after A/D digital-to-analogue conversions in electric network fault server
The abnormal conditions of current electric grid system, the second voltage signal provide electric energy for current electric grid fault detection system.Due to this
The corresponding hardware system needs of the detection method of electric network fault are individually powered in inventive embodiments, and are avoided as detecting system
Power supply is separately configured, therefore, can be isolated from high voltage leg voltage can as power supply second voltage signal into
Row power supply.In the embodiment of the present invention, high voltage leg voltage can be converted into AC alternating voltages by voltage transformer, using
Inductor voltage regulator is decomposed into first voltage signal and second voltage signal, one as fault detect of first voltage signal
Detection object is delivered in electric network fault server.
It should be noted that in order to ensure the stabilization and reliability of detecting system, a suppression is configured on voltage adjuster
The immunity module of crest voltage processed and reversed surge so that collected first voltage is sent into electricity after A/D digital-to-analogue conversions
It is handled in net failed server.
103, true according to the high voltage leg voltage of the test point acquired in real time using balance bridge and uneven bridge switching mode
The insulation against ground state is sent in electric network fault server by the insulation against ground state of the busbar of regular inspection measuring point.
For the embodiment of the present invention, so that the electric network fault server carries out judging whether to early warning.Wherein, described
Insulation against ground state is the conductor inside cable and the resistance value between the earth is how many, if the too low explanation of resistance value will appear
The case where electric leakage or even short circuit grounding.The high voltage leg voltage acquired in real time can calculate busbar insulation against ground state,
Mathematic interpolation is used, accurately calculates positive and negative busbar grounding impedance and its impedance value, and obtained insulation against ground state is sent out
It send into electric network fault server, to be compared with preset impedance value according to this insulation against ground state, determines whether
There are exception or failures.
It should be noted that the balance bridge determines that insulation against ground state is to utilize balance with uneven bridge switching mode
The sensor detection busbar of bridge circuit, uneven bridge circuit and a branch and the Grounding of branch, when detecting system executes certainly
When dynamic detection, it is detected using balanced bridge circuit, if there is Grounding generation, balanced bridge is destroyed, detecting system
Then start uneven bridge circuit detection, to accurately detect impedance ground value, completes the busbar electricity of on-line monitoring straight-flow system
Pressure and insulation against ground resistance, determine bus voltage value and positive and negative, busbar insulation against ground resistance value.
In addition, in the embodiment of the present invention, two group storage battery paired runnings, leads to ring between two group storage batteries in order to prevent
Stream, is configured with isolating diode, and two sections of busbares is made to share a set of microcomputer seal, to avoid when checking ground connection over the ground
Injection Signal is closed busbar short-circuit device switch when any one charging equipment failure, and two sections of busbares can be combined into one section, when
When having earth fault, two sets of seals all to earth point Injection Signal, influence the accurate lookup of earth point, to the electricity of detection
It by two sets of chargers, two groups of batteries, two sets of battery inspection devices, a set of microcomputer seal, two sections of busbares and is opened in net system
It closes and constitutes, as shown in Figure 3.
In the embodiment of the present invention, in order to accurately determine that insulation against ground state, step 103 are specifically as follows:According to described
The busbar of test point chooses balance bridge detection mode and one kind among uneven bridge detection mode with grounding situation;If root
After busbar and the earth-free selection balance bridge detection mode of branch of the test point, the inspection that acquires using balanced bridge and in real time
The high voltage leg voltage of measuring point calculate the first impedance differences of positive and negative busbar, the positive and negative grounding of high voltage leg voltage second
Impedance differences, and determine insulation against ground state according to first impedance differences and the second impedance differences, by the insulation against ground
State is sent in electric network fault server;If being examined or, choosing uneven bridge according to the busbar of the test point and grounding
After survey mode, the high voltage leg voltage of the test point acquired using unbalanced bridge and in real time calculates busbar voltage and positive and negative
Busbar insulation against ground resistance value, and it is exhausted over the ground according to the busbar voltage and the positive and negative busbar insulation against ground resistance value determination
The insulation against ground state is sent in electric network fault server by edge state.
In the embodiment of the present invention, busbar and the branch line Grounding of the test point choose balanced bridge circuit and uneven bridge
Circuit is to be defaulted as earth-free, then choose balanced bridge circuit and be detected when detecting system starts detection, when being grounded
When situation, balanced bridge is destroyed, and detecting system then starts uneven bridge circuit detection.In the embodiment of the present invention, balance is used
When bridge circuit using uneven bridge circuit with detecting, determine that the mode of insulation against ground state is different, so as to realize different standards
The detection of exactness.
Further, after step 102 and 103, in order to carry out the specific judgement of fault detect, the method further includes:
After the electric network fault server receives the first voltage signal, it is preset to judge whether the first voltage signal meets
Abnormal level signal triggers interruption system if meeting, so that the network system stops power supply;And/or the power grid
After failed server receives the insulation against ground state, it is pre- to judge whether the busbar voltage in the insulation against ground state is less than
If whether voltage value and/or insulation against ground resistance are less than predetermined resistance value, if less than the predetermined resistance value and/or described pre-
If resistance value then sends alarm signal.
For the embodiment of the present invention, for first voltage signal, electric network fault server is receiving first voltage signal
First voltage signal, i.e., be compared, judgement is by the judgement for carrying out abnormal level signal afterwards with preset abnormal level signal
It is no to meet, if meeting, illustrate occur the case where abnormal failure in network system, start interruption system, the system of interruption can be right
Network system is powered off, so that staff overhauls.In addition, being directed to insulation against ground state, electric network fault server connects
After receiving insulation against ground state, judge whether busbar voltage or bus bar resistance are less than preset voltage or resistance respectively, to take
It obtains and whether breaks down, alarm.
It should be noted that in the present embodiment, first voltage signal and the output of insulation against ground state can pass through RS485
Or RS422 serial ports is communicated, and can first voltage signal, insulation against ground state be directly uploaded to electric network fault server
In, interrupt instruction, alarm signal are sent out by electric network fault server.Detecting system can by LED screen or LCD screen into
Row instruction, and the information such as delay parameter can be configured by the control keyboard of panel, it may be necessary to infrared distant
Control device is configured.To ensure the stable operation of detecting system, prevents electric network fault server from crashing, prevented using " house dog "
Only software unexpectedly occurs;To obtain the in due course fault detection information of system, it is in due course to be carried out using RTC clock and to detecting system
Monitoring, and fault message is stored in the EERPOM of 8K, prevent power down information from losing, and can believe in due course System History
Breath is inquired;Data communication is communicated using 485 buses and electric network fault server.
Further, in order to realize the increase property and scalability of network system test point, the electricity in the present embodiment
The detection method of net failure further includes:When the fault detecting point of network system update branch road, according to preset branch pair
Already present each road insulation against ground state and state of insulation calculation formula in ground insulation list calculate newer event
Hinder the predetermined resistance value and/or preset voltage value in test point insulation against ground state, the state of insulation calculation formula is:Wherein, n is circuitry number, aiFor pair of i-th branch road
Ground state of insulation, JRFor the resistance rated value of insulation against ground state, JUFor the voltage rating of insulation against ground state.
For the embodiment of the present invention, since increased fault detecting point is to increase high voltage leg, every is increased
Branch line, be required for setting different critical voltage values and critical resistance value, so that every high pressure branch road is all in accordance with the pre- of itself
If voltage value, predetermined resistance value carry out judging whether to break down, enhance the accuracy of detection of network system.In addition, the present invention is real
It applies in example, state of insulation calculation formula is according to parsing branch case, each branch road insulation against ground state, insulation against ground state
Resistance rated value, voltage rating set, due to insulation against ground state meeting under unfaulty conditions of other branches
It stores in real time into preset branch insulation against ground list and is analyzed and checked, and increased branch is impacted, therefore,
The insulation against ground state of branch road is the important parameter in insulation against ground state computation formula.
A kind of detection method of electric network fault provided by the invention realizes the accurate high-voltage electricity branch position for determining failure and occurring
It sets, improves the exclusion efficiency of failure, substantially increase power supply reliability, reduce quantity and the hunting time of failure track walker,
Largely improve working efficiency.
Further, the specific implementation as method shown in Fig. 1, an embodiment of the present invention provides a kind of inspections of electric network fault
Examining system, as shown in figure 4, the system comprises:Management module 21, power supply electricity-fetching module 22, acquisition module 23,
The management module 21 is connected with the power supply electricity-fetching module 22, for being combined by EMI filtering and LC filtering
The three-phase alternating current acquired on test point position is converted to the high voltage leg voltage of voltage stabilization, the test point is double chargings
Fault detecting point in the network system of double cell composition;
The power supply electricity-fetching module 22 is connected with the acquisition module 23, for receiving the transmission of the management module 21
High voltage leg voltage, and the high voltage leg voltage is delivered to after voltage transformer and is converted to alternating voltage, and by sense
Voltage adjuster is answered to be decomposed into the first voltage signal as voltage acquisition signal, and as the second voltage signal of power supply,
The first voltage signal is used to be delivered in electric network fault server the current electric grid system that detects after A/D digital-to-analogue conversions
Abnormal conditions, the second voltage signal provide electric energy for current electric grid fault detection system;
The acquisition module 23 is connected with the power supply electricity-fetching module 22, is passed for receiving the power supply electricity-fetching module 22
Defeated high voltage leg voltage, and using balance bridge and uneven bridge switching mode, according to the high pressure branch of the test point acquired in real time
Line voltage determines the insulation against ground state of the busbar of test point, and the insulation against ground state is sent to electric network fault server
In, so that the electric network fault server carries out judging whether to early warning.
Further, the acquisition module 23 is specifically used for being selected with grounding situation according to the busbar of the test point
Take balance bridge detection mode and one kind among uneven bridge detection mode;If not connect with branch according to the busbar of the test point
After balance bridge detection mode is chosen on ground, the high voltage leg voltage of the test point acquired using balanced bridge and in real time calculates positive and negative
First impedance differences of busbar, the second impedance differences of the positive and negative grounding of high voltage leg voltage, and according to first impedance
Difference and the second impedance differences determine insulation against ground state, and the insulation against ground state is sent in electric network fault server;
If or, after choosing uneven bridge detection mode according to the busbar of the test point and grounding, using unbalanced bridge and reality
When the high voltage leg voltage of test point that acquires calculate busbar voltage and positive and negative busbar insulation against ground resistance value, and according to institute
It states busbar voltage and the positive and negative busbar insulation against ground resistance value determines insulation against ground state, the insulation against ground state is sent out
It send into electric network fault server.
Further, as shown in figure 5, the system also includes:Electric network fault server 24,
The electric network fault server 24 judges the first voltage letter after receiving the first voltage signal
Number whether meet preset abnormal level signal, if meeting, trigger interruption system, so that the network system stops supplying
Electricity;And/or
The electric network fault server 24 is additionally operable to after receiving the insulation against ground state, judges the insulation against ground
Whether the busbar voltage in state is less than preset voltage value and/or whether insulation against ground resistance is less than predetermined resistance value, if being less than
The predetermined resistance value and/or the predetermined resistance value, then send alarm signal.
Further, the management module 21 is specifically additionally operable to the three-phase alternating current acquired on test point position and passes through EMI
Filter the input of input and the pulsewidth modulation respectively as industrial frequency rectifying;Three-phase alternating current point after the industrial frequency rectifying
Not after PFC power factors, the frequency conversion of DC/AC high frequencies, high-voltage frequency converter, LC filtering, the result of EMI filtering outputs is carried out again
As the input of the pulse-width adjustment, modulated result is fed back in the DC/AC high frequencies frequency conversion, to form closed loop
Exchange detection;The high voltage leg electricity of voltage stabilization will be used as by exchanging the result detected and by the filtering outputs of EMI again
Pressure.
Specifically, the electric network fault server 24, is additionally operable to the fault detect when network system update branch road
When point, according to the already present each road insulation against ground state and state of insulation meter in preset branch insulation against ground list
It calculates formula and calculates predetermined resistance value and/or preset voltage value in newer fault detecting point insulation against ground state, the insulation
State computation formula is:Wherein, n is circuitry number, ai
For the insulation against ground state of i-th branch road, JRFor the resistance rated value of insulation against ground state, JUFor the electricity of insulation against ground state
Press rated value.
A kind of detection method of electric network fault provided by the invention realizes the accurate high-voltage electricity branch position for determining failure and occurring
It sets, improves the exclusion efficiency of failure, substantially increase power supply reliability, reduce quantity and the hunting time of failure track walker,
Largely improve working efficiency.
It should be understood by those skilled in the art that, embodiments herein can be provided as method, system or computer program
Product.Therefore, complete hardware embodiment, complete software embodiment or reality combining software and hardware aspects can be used in the application
Apply the form of example.Moreover, the application can be used in one or more wherein include computer usable program code computer
The computer program production implemented in usable storage medium (including but not limited to magnetic disk storage, CD-ROM, optical memory etc.)
The form of product.
The application is with reference to method, the flow of equipment (system) and computer program product according to the embodiment of the present application
Figure and/or block diagram describe.It should be understood that can be realized by computer program instructions every first-class in flowchart and/or the block diagram
The combination of flow and/or box in journey and/or box and flowchart and/or the block diagram.These computer programs can be provided
Instruct the processor of all-purpose computer, special purpose computer, Embedded Processor or other programmable data processing devices to produce
A raw machine so that the instruction executed by computer or the processor of other programmable data processing devices is generated for real
The device for the function of being specified in present one flow of flow chart or one box of multiple flows and/or block diagram or multiple boxes.
These computer program instructions, which may also be stored in, can guide computer or other programmable data processing devices with spy
Determine in the computer-readable memory that mode works so that instruction generation stored in the computer readable memory includes referring to
Enable the manufacture of device, the command device realize in one flow of flow chart or multiple flows and/or one box of block diagram or
The function of being specified in multiple boxes.
These computer program instructions also can be loaded onto a computer or other programmable data processing device so that count
Series of operation steps are executed on calculation machine or other programmable devices to generate computer implemented processing, in computer or
The instruction executed on other programmable devices is provided for realizing in one flow of flow chart or multiple flows and/or block diagram one
The step of function of being specified in a box or multiple boxes.
In a typical configuration, computing device includes one or more processors (CPU), input/output interface, net
Network interface and memory.
Memory may include computer-readable medium in volatile memory, random access memory (RAM) and/
Or the forms such as Nonvolatile memory, such as read-only memory (ROM) or flash memory (flashRAM).Memory is computer-readable medium
Example.
Computer-readable medium includes permanent and non-permanent, removable and non-removable media can be by any method
Or technology realizes information storage.Information can be computer-readable instruction, data structure, the module of program or other data.
The example of the storage medium of computer includes, but are not limited to phase transition internal memory (PRAM), static RAM (SRAM), moves
State random access memory (DRAM), other kinds of random access memory (RAM), read-only memory (ROM), electric erasable
Programmable read only memory (EEPROM), fast flash memory bank or other memory techniques, read-only disc read only memory (CD-ROM) (CD-ROM),
Digital versatile disc (DVD) or other optical storages, magnetic tape cassette, tape magnetic disk storage or other magnetic storage apparatus
Or any other non-transmission medium, it can be used for storage and can be accessed by a computing device information.As defined in this article, it calculates
Machine readable medium does not include temporary computer readable media (transitorymedia), such as data-signal and carrier wave of modulation.
It these are only embodiments herein, be not intended to limit this application.To those skilled in the art,
The application can have various modifications and variations.It is all within spirit herein and principle made by any modification, equivalent replacement,
Improve etc., it should be included within the scope of claims hereof.
Claims (10)
1. a kind of detection method of electric network fault, which is characterized in that including:
The high pressure that the three-phase alternating current acquired on test point position is converted to voltage stabilization is combined with LC filtering by EMI filtering
Branch line voltage, the test point are the fault detecting point in the network system of double charging double cell compositions;
The high voltage leg voltage is delivered to after voltage transformer and is converted to alternating voltage, and by inductor voltage regulator point
Solution is the first voltage signal as voltage acquisition signal, and as the second voltage signal of power supply, the first voltage letter
Number for be delivered to after A/D digital-to-analogue conversions in electric network fault server detect current electric grid system abnormal conditions, it is described
Second voltage signal provides electric energy for current electric grid fault detection system;
Using balance bridge and uneven bridge switching mode, test point is determined according to the high voltage leg voltage of the test point acquired in real time
Busbar insulation against ground state, the insulation against ground state is sent in electric network fault server, so as to the power grid therefore
Barrier server carries out judging whether to early warning.
2. according to the method described in claim 1, it is characterized in that, described using balance bridge and uneven bridge switching mode, root
The high voltage leg voltage of the test point acquired when factually determines the insulation against ground state of the busbar of test point, by the insulation against ground
State is sent to electric network fault server:
According to the busbar of the test point and grounding situation choose balance bridge detection mode and uneven bridge detection mode it
In one kind;
If after the busbar of the test point and the earth-free selection balance bridge detection mode of branch, using balanced bridge and in real time
The high voltage leg voltage of the test point of acquisition calculates the first impedance differences of positive and negative busbar, the positive and negative branch of high voltage leg voltage connects
Second impedance differences on ground, and determine insulation against ground state according to first impedance differences and the second impedance differences, it will be described
Insulation against ground state is sent in electric network fault server;Or,
If after choosing uneven bridge detection mode according to the busbar of the test point and grounding, using unbalanced bridge and reality
When the high voltage leg voltage of test point that acquires calculate busbar voltage and positive and negative busbar insulation against ground resistance value, and according to institute
It states busbar voltage and the positive and negative busbar insulation against ground resistance value determines insulation against ground state, the insulation against ground state is sent out
It send into electric network fault server.
3. according to the method described in claim 1, it is characterized in that, the method further includes:
After the electric network fault server receives the first voltage signal, it is pre- to judge whether the first voltage signal meets
If abnormal level signal trigger interruption system if meeting so that the network system stop power supply;And/or
After the electric network fault server receives the insulation against ground state, the busbar electricity in the insulation against ground state is judged
Whether pressure is less than preset voltage value and/or whether insulation against ground resistance is less than predetermined resistance value, if being less than the predetermined resistance value
And/or the predetermined resistance value, then send alarm signal.
4. according to the method described in claim 1, it is characterized in that, described combined by EMI filtering and LC filtering by test point
The high voltage leg voltage that the three-phase alternating current acquired on position is converted to voltage stabilization includes:
The three-phase alternating current acquired on test point position filters the input and pulsewidth modulation respectively as industrial frequency rectifying by EMI
Input;
Three-phase alternating current after the industrial frequency rectifying passes through PFC power factors, the frequency conversion of DC/AC high frequencies, high-pressure frequency-conversion respectively
After device, LC filtering, input of the result of EMI filtering outputs as the pulse-width adjustment, modulated result feedback are carried out again
To in the DC/AC high frequencies frequency conversion, the exchange to form closed loop detects;
The high voltage leg voltage of voltage stabilization will be used as by exchanging the result detected and by the filtering outputs of EMI again.
5. according to the method described in claim 4, it is characterized in that, the method further includes:
When the fault detecting point of network system update branch road, according to existing in preset branch insulation against ground list
Each road insulation against ground state and state of insulation calculation formula calculate newer fault detecting point insulation against ground state
In predetermined resistance value and/or preset voltage value, the state of insulation calculation formula is:
Wherein, n is circuitry number, aiFor i-th branch road
Insulation against ground state, JRFor the resistance rated value of insulation against ground state, JUFor the voltage rating of insulation against ground state.
6. a kind of detecting system of electric network fault, which is characterized in that including:Management module, power supply electricity-fetching module, acquisition module,
The management module is connected with the power supply electricity-fetching module, for being combined test point by EMI filtering and LC filtering
The three-phase alternating current acquired on position is converted to the high voltage leg voltage of voltage stabilization, and the test point is double charging double cell groups
At network system in fault detecting point;
The power supply electricity-fetching module is connected with the acquisition module, the high voltage leg electricity for receiving the management module transmission
Pressure, and the high voltage leg voltage is delivered to after voltage transformer and is converted to alternating voltage, and adjusted by induced voltage
Device is decomposed into the first voltage signal as voltage acquisition signal, and as the second voltage signal of power supply, first electricity
Pressure signal is used to be delivered to the abnormal conditions that current electric grid system is detected in electric network fault server after A/D digital-to-analogue conversions,
The second voltage signal provides electric energy for current electric grid fault detection system;
The acquisition module is connected with the power supply electricity-fetching module, the high pressure branch for receiving the power supply electricity-fetching module transmission
Line voltage, and using balance bridge and uneven bridge switching mode, determined according to the high voltage leg voltage of the test point acquired in real time
The insulation against ground state is sent in electric network fault server, so as to described by the insulation against ground state of the busbar of test point
Electric network fault server carries out judging whether to early warning.
7. system according to claim 6, which is characterized in that
The acquisition module is specifically used for choosing balance bridge detection mode with grounding situation according to the busbar of the test point
With one kind among uneven bridge detection mode;If being detected according to the busbar of the test point and the earth-free selection balance bridge of branch
After mode, the high voltage leg voltage of the test point acquired using balanced bridge and in real time calculates the first impedance contrast of positive and negative busbar
Second impedance differences of value, the positive and negative grounding of high voltage leg voltage, and according to first impedance differences and the second impedance contrast
Value determines insulation against ground state, and the insulation against ground state is sent in electric network fault server;If or, according to the detection
After busbar and the grounding of point choose uneven bridge detection mode, the height of the test point acquired using unbalanced bridge and in real time
Press branch line voltage to calculate busbar voltage and positive and negative busbar insulation against ground resistance value, and according to the busbar voltage and it is described just,
Negative busbar insulation against ground resistance value determines insulation against ground state, and the insulation against ground state is sent to electric network fault server
In.
8. system according to claim 6, which is characterized in that the system also includes:Electric network fault server,
Whether the electric network fault server judges the first voltage signal after receiving the first voltage signal
Meet preset abnormal level signal, if meeting, trigger interruption system, so that the network system stops power supply;With/
Or,
The electric network fault server is additionally operable to after receiving the insulation against ground state, judges in the insulation against ground state
Busbar voltage whether be less than whether preset voltage value and/or insulation against ground resistance are less than predetermined resistance value, if less than described pre-
If resistance value and/or the predetermined resistance value, then send alarm signal.
9. system according to claim 6, which is characterized in that
The management module is specifically additionally operable to the three-phase alternating current acquired on test point position and is filtered respectively as work by EMI
The input of frequency rectification and the input of pulsewidth modulation;Three-phase alternating current after the industrial frequency rectifying passes through PFC power respectively
After factor, the frequency conversion of DC/AC high frequencies, high-voltage frequency converter, LC filtering, the result of EMI filtering outputs is carried out again as the pulsewidth
The input of adjustment, modulated result are fed back in the DC/AC high frequencies frequency conversion, and the exchange to form closed loop detects;It will
Result by exchanging detection and by the filtering outputs of EMI again is used as the high voltage leg voltage of voltage stabilization.
10. system according to claim 9, which is characterized in that
The electric network fault server is additionally operable to when the fault detecting point of network system update branch road, according to preset
Already present each road insulation against ground state and state of insulation calculation formula in branch insulation against ground list calculate more
Predetermined resistance value and/or preset voltage value in new fault detecting point insulation against ground state, the state of insulation calculation formula
For: Wherein, n is circuitry number, aiFor i-th branch road
Insulation against ground state, JRFor the resistance rated value of insulation against ground state, JUFor the voltage rating of insulation against ground state.
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| CN112578186A (en) * | 2020-12-21 | 2021-03-30 | 山东积成智通新能源有限公司 | Direct-current insulation detection system and device and balance bridge measurement method |
| CN112904226A (en) * | 2021-01-19 | 2021-06-04 | 国网河北省电力有限公司 | Method for rapidly judging short-circuit fault of high-voltage bus based on induced electricity |
| WO2023193529A1 (en) * | 2022-04-08 | 2023-10-12 | 东方电气集团东方电机有限公司 | Insulation monitoring method and apparatus, electronic device and storage medium |
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