CN110208652A - A kind of Small Electric Current Earthing And Routing Device and selection method - Google Patents
A kind of Small Electric Current Earthing And Routing Device and selection method Download PDFInfo
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- CN110208652A CN110208652A CN201910533752.7A CN201910533752A CN110208652A CN 110208652 A CN110208652 A CN 110208652A CN 201910533752 A CN201910533752 A CN 201910533752A CN 110208652 A CN110208652 A CN 110208652A
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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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Abstract
The invention discloses a kind of Small Electric Current Earthing And Routing Device and selection methods, can effectively improve route selection precision.The device includes: exchange Input transformation module, and for input analog signals to be isolated and converted, transformed analog signals are transmitted to A/D conversion module；A/D conversion module for acquiring analog signals, and is transmitted to CPU module；Switching input module for acquiring intake, and is transmitted to CPU module；CPU module, the analog quantity for that will acquire carry out faulty line judgement, the output amount of outputing to switching value output module as route selection sample data；Switching value output module, for receiving the amount of outputing of CPU module output, control external equipment is opened and closed.
Description
Technical field
This disclosure relates to a kind of Small Electric Current Earthing And Routing Device and selection method.
Background technique
China 35kV and the power distribution network method of operation below mostly use the small current neutral grounding method of operation at present.In this operation
When singlephase earth fault occurring under mode, short circuit current very little, faulty line cannot be identified quickly, therefore, single-phase earthing occur
Faulty line can be rapidly and accurately selected when failure to be particularly important.
When low current singlephase earth fault occurs, since the line voltage of system keeps symmetrical, power grid is still in this case
It can run two hours, it is not necessary to trip immediately.But since non-faulting phase-to-ground voltage increases, the insulation being easy in breakdown system is thin
Weakness may develop into two-phase or three-phase shortcircuit.If fault point generates intermittence electric arc, or even series resonance mistake can be generated
Voltage, and then cause to burn out equipment and phase fault may be developed into.In order to avoid risk generation, this requires operators
Faulty line is found out at the appointed time, guarantees power distribution network safety and stability.
Inventor has found in R&D process, existing Small Electric Current Earthing And Routing Device exist when handling ground fault with
Lower Railway Project:
(1) there are mistakes, selection method Shortcomings to report ground path by mistake, can make for Small Electric Current Earthing And Routing Device wiring
At line outage is operated normally, power supply reliability is seriously affected.
(2) regulation personnel use " open line method " to try roping row line, be easy to cause normal operation line outage, seriously affect
Power supply reliability.
(3) Small Electric Current Earthing And Routing Device data processing performance is weak, so that ground fault is excluded time extension, may make system
In insulation weak spot breakdown, develop into two-phase or three-phase shortcircuit, influence power supply reliability.
Existing selection method be it is single which line failure provided, but failure at different conditions is sentenced
Disconnected accuracy is not high, in addition, the single result of existing selection method is also unfavorable for carrying out integrating with information fusion technology sentencing
It is disconnected.
Summary of the invention
In order to overcome the above-mentioned deficiencies of the prior art, present disclose provides a kind of Small Electric Current Earthing And Routing Device and route selection sides
Method can effectively improve route selection precision.
Technical solution used by the disclosure is:
A kind of Small Electric Current Earthing And Routing Device, the device include:
Input transformation module is exchanged, for input analog signals to be isolated and converted, by transformed analog quantity
Signal is transmitted to A/D conversion module；
A/D conversion module for acquiring analog signals, and is transmitted to CPU module；
Switching input module for acquiring intake, and is transmitted to CPU module；
CPU module, the analog quantity for that will acquire carry out faulty line judgement, output is outputed as route selection sample data
It measures to switching value output module；
Switching value output module, for receiving the amount of outputing of CPU module output, control external equipment is opened and closed.
A kind of small current earthing wire-selecting method, this method realized based on Small Electric Current Earthing And Routing Device as described above,
Method includes the following steps:
System initialization, setting starting voltage and each section of bus go out line number；
Route selection sample data is obtained, and judges whether switch conjugates；
Route selection sample data is handled, faulty line is selected.
Further, the acquisition route selection sample data, and judge that the step of whether switch conjugates includes:
Judge whether A/D conversion is completed, if completing, while sampling multiple analog quantity, and as route selection sample data；
Whether judging the starting of residual voltage Sudden Changing Rate, if inactive, the amount of outputing is exported；
Intake is obtained, judges whether intake changes, if there is a change, then generates switch changed position event note
Record.
Further, described the step of handling to route selection sample data, select faulty line, includes:
Whether judging the starting of residual voltage variable；If starting, acquires cycle data, and carry out wavelet analysis to it；
The calculating of Fu's formula is carried out to the cycle data after wavelet analysis, obtains the phase angle of residual voltage；Judge residual voltage
Phase angle whether be greater than the threshold value of setting.
If the phase angle of residual voltage is greater than the threshold value of setting, judge it whether more than 20ms；If being more than, judgement is
No is virtual ground failure；
If not virtual ground failure, then calculate the fault measurement of each route selection sample data, and right using information gain degree
The fault measurement of each route selection sample is analyzed, and is selected a part of sample as new route selection sample, is constituted sample set；
Route selection sample in sample set is handled using the Principal Component Analysis in machine learning, selects faulty line.
Through the above technical solutions, the beneficial effect of the disclosure is:
(1) disclosure can provide the sign degree to break down, under different route selection environment, give to certain selection method
Different weights are given, the serious consequence failed to judge and judged by accident is brought so as to avoid single method；
(2) whether each route of the disclosure no longer independent judgment is fault wire, but contacts the correlation between route, is led to
Cross the fault message feature of lateral comparison route；
(3) disclosure is establishing the fault measurement stage, the fault measurement of sample is calculated using information gain degree, this method is not
The weight of single selection method is only gived, and enhances line-internal data；
(4) disclosure has analysed in depth the characteristics of fault measurement sample and difficult point, and the route selection sample obtained is a dimension
High, unbalanced, complex distribution the data set of number, the Principal Component Analysis being introduced into machine learning reduce the dimension of route selection sample data
Number, can effectively improve route selection precision.
Detailed description of the invention
The Figure of description for constituting a part of this disclosure is used to provide further understanding of the disclosure, and the disclosure is shown
Meaning property embodiment and its explanation do not constitute the improper restriction to the disclosure for explaining the application.
Fig. 1 is the structural block diagram of the present embodiment Small Electric Current Earthing And Routing Device；
Fig. 2 is the circuit diagram of the present embodiment A/D conversion module；
Fig. 3 is the circuit diagram of the present embodiment starting control module；
Fig. 4 is the flow chart of the present embodiment small current earthing wire-selecting method；
Fig. 5 is the flow chart of the present embodiment sampling；
Fig. 6 is the flow chart of the present embodiment route selection.
Specific embodiment
The disclosure is described further with embodiment with reference to the accompanying drawing.
It is noted that following detailed description is all illustrative, it is intended to provide further instruction to the disclosure.Unless another
It indicates, all technical and scientific terms that the disclosure uses have logical with disclosure person of an ordinary skill in the technical field
The identical meanings understood.
It should be noted that term used herein above is merely to describe specific embodiment, and be not intended to restricted root
According to the illustrative embodiments of the application.As used herein, unless the context clearly indicates otherwise, otherwise singular
Also it is intended to include plural form, additionally, it should be understood that, when in the present specification using term "comprising" and/or " packet
Include " when, indicate existing characteristics, step, operation, device, component and/or their combination.
One or more embodiments provide a kind of Small Electric Current Earthing And Routing Device, improve the choosing of low current singlephase earth fault
Line accuracy.
Attached drawing 1 is please referred to, the Small Electric Current Earthing And Routing Device includes CPU module, exchange Input transformation module, A/D turns
Change the mold block, input and output module, power module and human-computer interaction module, the output end and A/D of the exchange Input transformation module
Conversion module connection, the input and output module includes switching input module and switching value output module, and the switching value is defeated
The input terminal for entering module is connect with the output end of A/D conversion module, and output end is connect with CPU module, the output of the CPU module
End is connect by switching value output module with external equipment, realizes that, to peripheral equipment control, the power module is used for other
Module for power supply, the human-computer interaction module are connect with CPU module, for showing data, state, are modified parameter, are recorded route selection number
According to；Wherein:
The exchange Input transformation module, for input analog signals to be isolated and converted, by transformed mould
Analog quantity signal is transmitted to A/D conversion module；
The A/D conversion module, for acquiring analog signals, and is transmitted to CPU module；
The switching input module for acquiring intake, and is transmitted to CPU module；
The CPU module, the analog quantity for that will acquire carry out faulty line judgement, output as route selection sample data
The amount of outputing is to switching value output module；
The switching value output module, for receiving the amount of outputing of CPU module output, control external equipment is opened and is closed
It closes.
In the present embodiment, the host use 32 high-performance ARM chip STM32F103VET6, have it is low in energy consumption, at
This low remarkable advantage；It is specifically configured to:
32 tunnel analog quantitys are obtained, as route selection sample data；Whether judging the starting of residual voltage Sudden Changing Rate, if inactive,
Then export the amount of outputing；Intake is obtained, judges whether intake changes, if there is a change, then generates switch changed position thing
Part record；
Whether judging the starting of residual voltage variable, cycle data are obtained, and wavelet analysis is carried out to it, after wavelet analysis
Cycle data carry out the calculating of Fu's formula, obtain the phase angle of residual voltage；Judge whether the phase angle of residual voltage is greater than threshold value,
If more than threshold value, judge whether more than 20ms；If being more than, judge whether virtual ground, if non-virtual ground, according to central point
Earthing mode calculates the fault measurement of each route selection sample data, and analyzes it, and obtains high-dimensional route selection sample, uses
The Principal Component Analysis of machine learning handles route selection sample, selects faulty line, exports the amount of outputing, control output relay
Device is outputed.
In the present embodiment, for the needs of microcomputer fault line detection, the exchange Input transformation module includes plurality of voltages
Input terminal, multichannel current input terminal, voltage transformer, current transformer, linear isolation module and conversion module, the electricity
Pressure mutual inductor is connect with voltage input-terminal, and for acquiring simulation current flow, the current transformer and current input terminal connect
It connects, for acquiring analog voltage amount；The voltage transformer, current transformer are connect with linear isolation module respectively, the line
Sexual isolation module is connect with conversion module, and the conversion module is connect with A/D conversion module, and analog quantity passes through linear isolation module
After isolation, conversion module transformation, it is input to A/D conversion module.
Specifically, prior art construction is respectively adopted in the linear isolation module and conversion module, in this application no longer
It repeats.
In the present embodiment, the 32 tunnel analog quantitys that need to be acquired for Small Electric Current Earthing And Routing Device, the A/D conversion module
Including four AD conversion chip MAXl316.Attached drawing 2 is please referred to, passes through PC0-PC3 tetra- of STM32F103VET6 universaling I/O port
4 tunnel AD conversion chip MAXl316s, the PA0- of STM32F103VET6 universaling I/O port of the pin as chip select pin gating extension
PA3 connects the CONVST pin of four MAXl316 to start A/D conversion, it can be achieved that sampling while 32 tunnel analog quantity；Four
The EOLC pin of MAXl316 meets the PA4-PA7 of STM32F103VET6 universaling I/O port.
The present embodiment simplifies sampling section design of hardware and software using AD conversion chip MAXl316, preferably solves mould
The speed and precision problem of analog quantity acquisition, so that the overall performance of the Small Electric Current Earthing And Routing Device be made to obtain larger raising.
In the present embodiment, the switching input module includes four photoelectric isolated chips and two buffers, is passed through
Four photoelectric isolated chips acquire 16 tunnel intakes, and are transmitted to two buffers, through two buffers that 16 tunnel intakes are defeated
Enter to CPU module.
It should be noted that the photoelectric isolated chip uses switching speed for the four-way TLP521-4 of more than 10 a microseconds
Type photoelectric isolated chip；The buffer uses tri-state inverter buffer 74HC240；By four TLP521-4 by 16 tunnels open into
Amount is sent to two panels buffer 74HC240, controls two panels respectively by STM32F103VET6 universaling I/O port pin PE0-PE15
The gating of tri-state inverter buffer 74HC240 realizes the acquisition inputted to 16 tunnel intakes.
In the present embodiment, the switching value output module includes sequentially connected photoisolator, driver and output
The output end of relay, the input terminal of the photoisolator and CPU module connects, the normally opened contact of the output relay with
External equipment connection, which can be closing coil, breaking coil；The output amount of outputing of CPU module passes through optical-electric module
After isolation, it is transferred to driver, output relay is driven by driver, output relay controls unlatching and the pass of external equipment
It closes.
Since the I/O pin output level of STM32F103VET6 is CMOS level, external equipment cannot be directly controlled, because
This could be used for the opening and closing of external equipment after needing to handle by interface conversion.Driving voltage is used in the present embodiment
For 24V, driving current is the energization and power-off that the miniature relay of 5A removes control closing coil, breaking coil；
The amount of outputing of STM32F103VET6 output passes through darlington array driver MC1416 driving output relay after Phototube Coupling
Device, by the energization and power-off of output relay control closing coil, breaking coil.In the present embodiment, the output switch parameter mould
Block is provided with 32 road output relays altogether, wherein ground connection alarm of the 28 road output relays for 28 routes, 4 tunnels export relay
Ground connection alarm of the device for 4 sections of buses.
Since the output of output relay directly controls tripping and the energization of closing coil and power-off, it is necessary to assure output after
Electric appliance action message.In order to guarantee the reliability of output relay movement, prevent other interference from causing output relay malfunction, institute
Stating switching value output module further includes starting control module, and the starting control module is used to control the confession of all output relays
Power supply.
Attached drawing 3 is please referred to, the starting control module includes four tunnels, two input nand gate 74HCT00 and starting relay
Two input terminals of Q1, NAND gate 74HCT00 are connect with the output end of CPU module respectively, the output end of NAND gate 74HCT00 with open
The coil of motor type relay Q1 connects, and the normally opened contact of the starting relay Q1 and the coil of output relay connect.
The course of work for the starting control module that the present embodiment proposes are as follows:
After STM32F103VET6 electrification reset program initialization, by two universaling I/O port pins of STM32F103VET6
QD0 and QD1 directly exports significant level control starting relay.When CPU module in Small Electric Current Earthing And Routing Device
When STM32F103VET6 does not export the amount of outputing, QD0 is high level, and QD1 is low level, and the end J9 exports low level, starting relay
Not charged, other output relay power supplys are disconnected, and can be effectively prevented output relay malfunction in this way；When there is output relay
When device is outputed, QD0 is low level, and QD1 is high level, and the end J9 exports high level, starting relay electrification, normally opened contact closure
Afterwards, STM32F103VET6 is just effective to the control of output relay.
I/O foot output level is uncertain when CPU module STM32F103VET6 is powered in order to prevent, CPU output end with
Latch is connected between the input terminal of switching value output module, the latch uses 74HC273, will by 74HC273
All output informations of STM32F103VET6 output are latched, 74HC273 when can guarantee STM32F103VET6 electrification reset
Output is low level, it is ensured that starting relay is failure to actuate.
In the present embodiment, the power supply needed for the power module is used to provide to whole device.The power module includes
Filter circuit and rectification module hand over (straight) stream 220V voltage after the input of jamproof filtered circuit, and rectified module is small electricity
Line-selected earthing device offer+5V, ± 12V and+24V power supply are provided.+ 5VCPU inside modules divide chip to provide power supply, and 24V is for driving
The power supply of motor type relay and the input of external switch amount.The operating voltage of core CPU chip STM32F103VET6 is+3.3V, should+
3.3V level be power module+5V level by linear transform circuit convert come.
Specifically, prior art construction is respectively adopted in the filter circuit and rectification module, repeats no more in this application.
In the present embodiment, the human-computer interaction module includes liquid crystal display, keyboard and indicator light, liquid crystal display,
Keyboard and indicator light are connect with CPU module respectively, and liquid crystal display selects the high-resolution liquid crystal of 320 × 240 dot matrix to show mould
Block can clearly show text and image, can show that information, the liquid crystal displays such as various data, parameter, route selection record are equipped with liquid
Brilliant sleep mode, liquid crystal auto sleep after 10 seconds in the case of fault-free, no alarm, when having keyboard operation, trouble-signal or announcement
Liquid crystal display is automatically opened when alert signal.The panel of the Small Electric Current Earthing And Routing Device is equipped with seven LED lights, respectively
Running indicator ,+24V lamp, plant failure lamp, mother I is grounded advance notice lamp, mother II is grounded advance notice lamp, mother III is grounded advance notice lamp and mother IV connects
Lamp is predicted on ground；When normal operation, running indicator constantly flashes, and+24V lamp is bright always, once running indicator no longer flash or+24V lamp not
It is bright, illustrate that exception occurs in device or power supply is faulty；When CPU module judges that single-phase earthing occurs for one section of bus or its outlet
When failure, control mother I be grounded advance notice lamp it is bright, mother II be grounded advance notice lamp, mother III be grounded advance notice lamp and mother IV be grounded advance notice lamp also
So.Trouble light is bright when device itself breaks down.Device panel is additionally provided with seven keys, respectively upper and lower, left and right, confirmation,
Cancel, involution, online modification parameter, modification time can be facilitated in conjunction with menu and checks that route selection records.
The route selection of singlephase earth fault has steady-state signal selection method and transient signal in existing small current neutral grounding system
Selection method.The steady-state signal selection method includes zero-sequence current than amplitude ratio phase route selection method, zero sequence power method, energy method, zero
Sequence node-pair method, quintuple harmonics method and injecting signal；These methods by neutral grounding mode due to being influenced and different event
The influence for hindering earthing mode has significant limitation.The transient signal selection method include first half-wave method, feature band method,
Wavelet analysis method and S-transformation method, although the arc resistance ground connection of transient signal selection method effective solution or intermittent electric arc
The failure line selection problem of ground connection, but when stable state ground connection especially high resistance ground occurs, wrapped in zero-sequence current and residual voltage
The transient signal contained is seldom even without Transient method all fails at this time, because the method has some limitations.
In order to solve the above-mentioned technical problem, one or more embodiments provide a kind of small current neutral grounding based on machine learning
Selection method, this method are realized based on Small Electric Current Earthing And Routing Device as described above.
The single-phase earth fault line selection of small current neutral grounding system is always the difficult point of relay protection field research, due to single
Selection method has limitation, and singlephase earth fault is complicated and changeable, so causing failure line selection accuracy rate lower.In order to mention
The precision of high route selection, the present embodiment go processing route selection sample data using machine learning algorithm, fast and effeciently screen out ground connection
Faulty line and ungrounded faulty line can effectively promote the route selection success of singlephase earth fault in small current neutral grounding system
Rate.
Please refer to attached drawing 4, the small current earthing wire-selecting method the following steps are included:
S101, Small Electric Current Earthing And Routing Device carry out initialization and self-test, and setting starting voltage, each section of bus go out line number
Deng.
Specifically, behind Small Electric Current Earthing And Routing Device shop, system initialization is first completed, completes to power on after system initialization
Self-test, including fixed value checking, RAM self-test, the self-test of input and output module, A/D conversion self-test, power module self-test.Self-test error
When, it issues alarm signal and generates corresponding event record.
S102 obtains route selection sample data.
Specifically, 32 tunnel analog quantitys are sampled, as route selection sample data；And the starting judgement of residual voltage Sudden Changing Rate is carried out,
The amount of outputing is outputed, intake is read, and judge whether intake changes, if there is a change, then switch changed position occurs,
Generate switch changed position logout.
Attached drawing 5 is please referred to, the concrete methods of realizing of the step 102 is as follows:
S102-1, judges whether A/D conversion is completed.If completing, 32 road A/D transformation results are read one by one.
Specifically, the state of the EOLC pin of sampling A/D chip MAXl316 is inquired, to determine whether A/D conversion is completed.If A/
D is converted, then gates four sampling A/D chip MAXl316 one by one, is completed 8 readings to every sampling A/D chip MAXl316, is completed
The acquisition of 32 tunnel analog quantitys.
S102-2, while sampling 32 tunnel analog quantitys.
Specifically, at the same gate four sampling A/D chip MAXl316 CONVST pin, start 32 tunnel analog quantity while adopt
Sample.
S102-3 whether judging the starting of residual voltage Sudden Changing Rate, if inactive, exports the amount of outputing.
S102-4 obtains intake, judges whether intake changes, if there is a change, then generate switch changed position
Logout.
The present embodiment will not only realize that analog acquisition and the starting judgement of residual voltage Sudden Changing Rate, also completion intake are adopted
Collect and the amount of outputing is outputed.
S103 goes processing route selection sample data using machine learning algorithm, judges earth fault line.
Machine learning, Machine Learning are a multi-field cross disciplines, are related to probability theory, statistics, approach
By multiple subjects such as, convextiry analysis, algorithm complexity theories.Specialize in the study row that the mankind were simulated or realized to computer how
To reorganize the existing structure of knowledge and being allowed to constantly improve the performance of itself to obtain new knowledge or skills.Machine learning
It is the core of artificial intelligence, is the fundamental way for making computer that there is intelligence, application spreads the every field of artificial intelligence, machine
Device study mainly using conclusion, synthesis rather than is deduced.
Attached drawing 6 is please referred to, the specific implementation of the step 103 is as follows:
S103-1, whether judging the starting of residual voltage variable.
In the present embodiment, residual voltage Sudden Changing Rate starting judgement is for clear failure sampled point, so as to fault point
The transient state sampled signal of 0.5 afterwards~1.0 frequency cycles effectively, accurately extract.
S103-2 acquires 6 cycle data, and carry out wavelet analysis to it if residual voltage variable starts.
S103-3 carries out the calculating of Fu's formula to the cycle data after wavelet analysis, obtains the phase angle of residual voltage.
S103-4, judges whether the phase angle of residual voltage is greater than the threshold value of setting.
Whether S103-5 judges it more than 20ms if the phase angle of residual voltage is greater than the threshold value of setting.
S103-6 judges whether it is virtual ground failure if being more than；
S103-7 then carries out voltage transformer disconnection if virtual ground failure.
S103-8, if not virtual ground failure, then surveyed using the failure that information gain degree calculates each route selection sample data
Degree, and the fault measurement of each route selection sample data is analyzed, a part of data are selected as new route selection sample, constitute sample
This collection.
Information gain degree is utilized according to the neutral point mode of connection in the fault measurement stage for calculating each route selection sample data
Fault measurement method is established, this method does not only give the weight of single selection method, and enhances line-internal data.And
The characteristics of analyzing the fault measurement of sample and difficult point have shown that route selection sample is a dimension height, unbalanced, complex distribution
Data set.
S103-9 is handled route selection sample in sample set using the Principal Component Analysis in machine learning, selects event
Hinder route.
In the present embodiment, the Principal Component Analysis being introduced into machine learning reduces the dimension of route selection sample data, can have
Improve route selection precision in effect ground.
S103-10 records the faulty line selected, and carries out failure wave-recording.
The small current earthing wire-selecting method that the present embodiment proposes, provides the sign degree to break down, in different route selections
Under environment, different weights are given to certain selection method, the serious consequence failed to judge and judged by accident is brought so as to avoid single method.
The small current earthing wire-selecting method that the present embodiment proposes, whether no longer each route of independent judgment is fault wire, but
The correlation between route is contacted, by the fault message feature of lateral comparison route, calculates each choosing using information gain degree
Line sample data fault measurement, does not only give the weight of single route selection sample data, and enhances line-internal data, deep
The characteristics of entering to analyze route selection sample fault measurement and difficult point have shown that route selection sample is a dimension height, unbalanced, distribution
Complicated data set, the Principal Component Analysis being introduced into machine learning reduce the dimension of route selection sample data, can effectively improve
Route selection precision.
The present embodiment is additionally provided to be tested using simulation dosage of the relay-protection tester to small current neutral grounding device.
Wiring: taking up an official post from relay-protection tester and take a phase voltage amount, and by its polar end and non-polar end, corresponding access is small
On the first via voltage input-terminal of current earthing line selection apparatus；A phase current amount is taken again, also according to the corresponding mode of polarity
It is linked on the first via current input terminal of device.
Outlet ground connection: setting relay-protection tester voltage output 31V, 20 degree of phase；Electric current 0.1A, 0 degree of phase, i.e., zero
20 degree of the advanced zero-sequence current of sequence voltage is at this time outlet ground connection, is grounded out wire size 1001, is obtained according to definite value, where the outlet
Bus wire size 1000 checks whether liquid crystal display is correct, and I section of bus indicator light is bright, while the 1st tunnel outlet alarm relay closes
It closes, if any tripping, then the 1st tunnel outlet tripping relay is closed, and measures whether its corresponding node is connected with multimeter.In this approach
Test the Grounding of all outlets.If any communication connection, then whether the device response message for checking that backstage receives is correct.
The phase of voltage can be changed to 30 degree, 60 degree, several values such as 90 degree are repeatedly tested.Using the small of the present embodiment
The results are shown in Table 1 for the route selection of current earthing line selection apparatus.
The simulation dosage of 1 Small Electric Current Earthing And Routing Device of table tests route selection result
In conclusion the Small Electric Current Earthing And Routing Device that the present embodiment proposes is simulating the single-phase earthing event in dosage test
Hindering route selection success rate is 100%, and the route selection accuracy of Small Electric Current Earthing And Routing Device is effectively promoted.
Although above-mentioned be described in conjunction with specific embodiment of the attached drawing to the disclosure, model not is protected to the disclosure
The limitation enclosed, those skilled in the art should understand that, on the basis of the technical solution of the disclosure, those skilled in the art are not
Need to make the creative labor the various modifications or changes that can be made still within the protection scope of the disclosure.
Claims (10)
1. a kind of Small Electric Current Earthing And Routing Device, characterized in that include:
Input transformation module is exchanged, for input analog signals to be isolated and converted, by transformed analog signals
It is transmitted to A/D conversion module；
A/D conversion module for acquiring analog signals, and is transmitted to CPU module；
Switching input module for acquiring intake, and is transmitted to CPU module；
CPU module, the analog quantity for that will acquire carry out faulty line judgement, the output amount of outputing is extremely as route selection sample data
Switching value output module；
Switching value output module, for receiving the amount of outputing of CPU module output, control external equipment is opened and closed.
2. Small Electric Current Earthing And Routing Device according to claim 1, characterized in that the exchange Input transformation module includes
Plurality of voltages input terminal, multichannel current input terminal, voltage transformer, current transformer, linear isolation module and transformation mould
Block, the voltage transformer are connect with voltage input-terminal, and for acquiring simulation current flow, the current transformer and electric current are defeated
Enter terminal connection, for acquiring analog voltage amount；The input terminal and the voltage transformer, electric current of the linear isolation module are mutual
Sensor connection, output end are connect with conversion module, and analog quantity is isolated, after conversion module transformation by linear isolation module, input
To A/D conversion module.
3. Small Electric Current Earthing And Routing Device according to claim 1, characterized in that the A/D conversion module includes at least
Four AD conversion chips being connect with CPU module.
4. Small Electric Current Earthing And Routing Device according to claim 1, characterized in that the switching input module includes extremely
Few four photoelectric isolated chips and at least two buffers acquire multichannel intake by photoelectric isolated chip, and are transmitted to slow
Device is rushed, multichannel intake is transmitted to CPU module by buffered device.
5. Small Electric Current Earthing And Routing Device according to claim 1, characterized in that the switching value output module include according to
Photoisolator, driver and the output relay of secondary connection, the output amount of outputing of CPU module after optical-electric module is isolated,
It is transferred to driver, output relay is driven by driver, output relay controls the opening and closing of external equipment.
6. Small Electric Current Earthing And Routing Device according to claim 5, characterized in that the switching value output module further includes
Start control module, the starting control module is used to control the power supply of output relay；Pass amount output module with
Latch is also connected between the output end of CPU.
7. Small Electric Current Earthing And Routing Device according to claim 6, characterized in that the starting control module includes four tunnels
Two input terminals of two input nand gates and starting relay, NAND gate are connect with the output end of CPU module respectively, NAND gate it is defeated
The connection of the coil of outlet and starting relay, the normally opened contact of the starting relay and the coil of output relay connect.
8. a kind of small current earthing wire-selecting method, this method is selected based on small current neutral grounding described in any one of claims 1 to 7
What line apparatus was realized, characterized in that method includes the following steps:
System initialization, setting starting voltage and each section of bus go out line number；
Route selection sample data is obtained, and judges whether switch conjugates；
Route selection sample data is handled, faulty line is selected.
9. small current earthing wire-selecting method according to claim 8, characterized in that the acquisition route selection sample data, and
Judge that the step of whether switch conjugates includes:
Judge whether A/D conversion is completed, if completing, while sampling multiple analog quantity, and as route selection sample data；
Whether judging the starting of residual voltage Sudden Changing Rate, if inactive, the amount of outputing is exported；
Intake is obtained, judges whether intake changes, if there is a change, then generates switch changed position logout.
10. small current earthing wire-selecting method according to claim 8, characterized in that described to be carried out to route selection sample data
Processing, the step of selecting faulty line include:
Whether judging the starting of residual voltage variable；If starting, acquires cycle data, and carry out wavelet analysis to it；
The calculating of Fu's formula is carried out to the cycle data after wavelet analysis, obtains the phase angle of residual voltage；Judge the phase of residual voltage
Whether parallactic angle is greater than the threshold value of setting；
If the phase angle of residual voltage is greater than the threshold value of setting, judge it whether more than 20ms；If being more than, judge whether it is
Virtual ground failure；
If not virtual ground failure, then calculate the fault measurement of each route selection sample data, and to each choosing using information gain degree
The fault measurement of line sample is analyzed, and is selected a part of sample as new route selection sample, is constituted sample set；
Route selection sample in sample set is handled using the Principal Component Analysis in machine learning, selects faulty line.
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