CN109507515A - A kind of automation ground detection device and method - Google Patents
A kind of automation ground detection device and method Download PDFInfo
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- CN109507515A CN109507515A CN201710829089.6A CN201710829089A CN109507515A CN 109507515 A CN109507515 A CN 109507515A CN 201710829089 A CN201710829089 A CN 201710829089A CN 109507515 A CN109507515 A CN 109507515A
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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
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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
- G01R31/005—Testing of electric installations on transport means
- G01R31/008—Testing of electric installations on transport means on air- or spacecraft, railway rolling stock or sea-going vessels
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- Testing Of Short-Circuits, Discontinuities, Leakage, Or Incorrect Line Connections (AREA)
Abstract
The invention discloses a kind of automation ground detection device and method, which includes: detection circuit, for constructing corresponding measure loop and sampling resistor being arranged；Voltage detection unit is detected for the voltage to sampling resistor；Voltage ratio adjusts unit, for voltage signal to be carried out scaling；Alternating current and direct current signal processing unit, for carrying out stopping direct current to input signal respectively, being handled every exchange；A/D converting unit, for converting analog signals into digital signal；Isolated location, for signal to be carried out isolation processing, so that Signal separator；CPU control unit obtains earthing detection result for carrying out control calculating to input signal.The detection device and method can accurately realize the positioning of fault point and the judgement of fault degree and fault type, enable vehicle-mounted microcomputer directly to carry out ground fault investigation and processing by testing result, improve the efficiency and intelligence degree of troubleshooting.
Description
Technical field
The present invention relates to locomotive earthing detection correlative technology field, a kind of automation ground detection device and side are particularly related to
Method.
Background technique
For the ground fault that locomotive occurs, it is broadly divided into three kinds: auxiliary generator ground fault, battery ground fault
And excitation circuit ground fault；Furthermore ground fault is divided into DC earthing and AC earth again.When ground fault occurs in locomotive
When, how accurate positioning both ground position and determine fault type subsequent overhaul plan is very important, in order to
Detect be which bar line which point ground connection occur ground fault, need to remove one rule of all conducting, with ohmmeter pair
Ground measures one by one, until finding out earth fault.Alternatively, being simply simply to judge whether to be grounded and cannot judge to be grounded
Position or fault type.
Such as: existing earthing detection mode on diesel locomotive at present, there are mainly two types of: mechanical grounding relay/electricity
Flow sensor detects earth current and ground connection examination lamp, can only judge that locomotive with the presence or absence of grounding phenomenon, can not judge ground connection degree
And mode, the microcomputer in locomotive can not make different disposal according to ground connection degree.Moreover, these earthing detection modes can not be right
The degree of ground fault makes the judgement of quantization, and ground connection is usually series at the positive and negative both ends of battery depending on lamp, by two lamp groups at,
Intermediate point is connected to the earth, and when no ground failure, two lamp brightness are identical, and when ground fault occurs, then brightness changes, and one
Bright one is dark.Grounding relay detection mode can only be supplied to locomotive microcomputer system in a manner of digital input signals, and ground connection examination lamp is then
Be judged with human eye lamp it is bright/lamp goes out to judge ground fault, can only judge that there are ground faults for locomotive, but can not equally navigate to
Specific earth fault is unfavorable for the investigation of failure.
Therefore, inventor has found that existing ground detection device or method can not be accurate during realizing the application
Fault point and earth fault type can not more judge ground fault severity, be merely able to simply using ground connection after
Electric appliance set action current value to judge whether locomotive has ground fault, or using ground connection examination lamp, judges that lamp is bright by human eye
Or lamp goes out, and causes vehicle-mounted microcomputer that can not participate in ground fault processing investigation in this way, reduces locomotive intelligence and troubleshooting
Efficiency.
Summary of the invention
In view of this, it is an object of the invention to propose a kind of automation ground detection device and method, it can be accurately real
The positioning of existing fault point and the judgement of fault degree and fault type, enable vehicle-mounted microcomputer directly by testing result into
Row ground fault investigation and processing, improve the efficiency and intelligence degree of troubleshooting.
Based on a kind of above-mentioned purpose automation ground detection device provided by the invention, comprising:
Detection circuit for constructing corresponding measure loop based on different grounding paths, and is arranged in measure loop
Sampling resistor；
Voltage detection unit is detected and is sent for the voltage to the sampling resistor both ends in the detection circuit
It is adjusted in unit to voltage ratio；
Voltage ratio adjusts unit, for voltage signal to be carried out scaling and output signal is sent to friendship respectively
Flow signal processing unit and direct current signal processing unit；
AC signal processing unit, for carrying out blocking stream process to input signal, output AC signal to A/D is converted single
Member；
Direct current signal processing unit, for handle every exchange to input signal, output direct current signal to A/D is converted single
Member；
A/D converting unit, for converting analog signals into digital signal and being output in isolated location；
Isolated location, for signal to be carried out isolation processing, so that corresponding electric signal separates and is output to CPU control
In unit；
CPU control unit obtains earthing detection result for carrying out control calculating to input signal.
Optionally, the detection circuit includes at least four divider resistances and three sampling resistors；The auxiliary power generation of locomotive
The first divider resistance and the first sampling resistor have been sequentially connected in series between machine winding neutral point and vehicle frame the earth；Excitation power supply around
The second divider resistance and the second sampling resistor have been sequentially connected in series between group neutral point and vehicle frame the earth；Battery positive voltage and vehicle
Third divider resistance and third sampling resistor have been sequentially connected in series between frame the earth；Between battery positive voltage and battery terminal negative
It is sequentially connected in series third divider resistance, third sampling resistor and the 4th divider resistance, alternatively, battery positive voltage and electric power storage
Third divider resistance, the 4th divider resistance have been sequentially connected in series between the cathode of pond；
Optionally, the AC signal processing unit includes capacitance unit, half-wave shaping unit, reversed sum-average arithmetic
Value circuit and amplifier follow unit；
AC signal passes sequentially through capacitance unit, half-wave shaping unit, reversed sum average value circuit and amplifier
Follow the cell processing AC signal that obtains that treated；
The direct current signal processing unit includes that low-pass filter unit and amplifier follow unit；
Direct current signal passes sequentially through low-pass filter unit and amplifier follows the cell processing direct current signal that obtains that treated.
Optionally, the isolated location is real using one of Magnetic isolation, sensor isolation, analog isolation or various ways
Existing signal isolation.
Optionally, the AC signal processing unit is first output to the output signal of direct current signal processing unit is isolated list
Member carries out isolation processing, is then input to A/D converting unit and carries out conversion process.
Optionally, the A/D converting unit replaces with comparator, the ground signalling for that will input and preset threshold value
It is compared and exports comparison result and give CPU control unit.
It optionally, further include communication unit, for being passed accordingly according to the testing result exported in the CPU control unit
It is defeated into locomotive control network, realize corresponding safeguard measure.
Present invention also provides a kind of automation ground detecting methods, construct ground connection accordingly for different grounding paths
Measure loop, and sampling resistor is set in each circuit and is used for voltage detecting；
The ground detecting method includes:
Detection obtains the voltage value at each sampling resistor both ends；
The voltage value at sampling resistor both ends is handled by voltage ratio adjustment, so that the voltage signal that output obtains is advantageous
In subsequent signal conversion processes；
Alternating current-direct current mixed signal adjusted is passed through into blocking stream process elimination DC component respectively and obtains full-wave AC letter
Number, DC component is eliminated by filtering processing and obtains pure direct current signal；
AC signal and direct current signal to treatment process carry out analog-to-digital conversion respectively and are converted to the analog signal of input
Digital signal；
Isolation processing is carried out to the digital signal after conversion, so that signal carries out electrical separation；
The signal after isolation is controlled and calculated by CPU control unit, obtains earthing detection result.
Optionally, the isolation processing includes one of Magnetic isolation, sensor isolation, analog isolation or various ways.
Optionally, it is described obtain earthing detection result after further include: will test result and be transferred in locomotive control network,
So that locomotive realizes safeguard measure corresponding with earthing detection data.
From the above it can be seen that automation ground detection device provided by the invention and method, by being directed to every
Earth fault line constructs corresponding measuring circuit respectively and is located at the sampling resistor both ends in measuring circuit by measurement
Voltage be grounded situation quantized data obtain, then by voltage ratio adjustment, alternating current-direct current signal processing, A/D convert with
And the processes such as isolation processing are split and optimization processing accordingly to providing, calculating analysis finally by certain data can
Obtain the analysis of the type and corresponding ground connection degree of ground fault.Therefore, herein described automation ground detection device and
Method can accurately realize the positioning of fault point and the judgement of fault degree and fault type, enable vehicle-mounted microcomputer direct
Ground fault investigation and processing are carried out by testing result, improves the efficiency and intelligence degree of troubleshooting.
Detailed description of the invention
Fig. 1 is a kind of structural schematic diagram of one embodiment for automating ground detection device provided by the invention；
Fig. 2 is the structural schematic diagram of one embodiment of detection circuit provided by the invention；
Fig. 3 is the structural schematic diagram of another embodiment of detection circuit provided by the invention；
Fig. 4 is the schematic illustration of one embodiment of voltage ratio provided by the invention adjustment；
Fig. 5 is the block diagram of alternating current-direct current signal processing provided by the invention；
Fig. 6 is the schematic illustration of signal provided by the invention conversion and isolation processing；
Fig. 7 is transmission principle schematic diagram of the CPU control unit provided by the invention to locomotive control network；
Fig. 8 is a kind of flow chart of one embodiment for automating ground detecting method provided by the invention.
Specific embodiment
To make the objectives, technical solutions, and advantages of the present invention clearer, below in conjunction with specific embodiment, and reference
Attached drawing, the present invention is described in more detail.
It should be noted that all statements for using " first " and " second " are for differentiation two in the embodiment of the present invention
The non-equal entity of a same names or non-equal parameter, it is seen that " first " " second " only for the convenience of statement, does not answer
It is interpreted as the restriction to the embodiment of the present invention, subsequent embodiment no longer illustrates this one by one.
For the ineffective situation of current earthing detection, the application targetedly proposes a kind of improved earthing detection dress
It sets and method, can effectively detect ground fault position and ground fault degree, while can also be real with locomotive control network
Existing data connection, and then it is grounded fault detection and implementation processing.
It is that a kind of structure of one embodiment for automating ground detection device provided by the invention is shown shown in referring to Fig.1
It is intended to.The automation ground detection device, comprising:
Detection circuit for constructing corresponding measure loop based on different grounding paths, and is arranged in measure loop
Sampling resistor；Wherein, it for the detection for different ground faults different faults position in other words, needs for different ground connection
Path or route construct measure loop accordingly, so that every kind of ground fault has corresponding measure loop corresponding, in this way can
Realize the detection of all ground faults, while also passing through setting sampling resistor and detect the voltage at sampling resistor both ends can be real
Now to the further analysis of ground connection degree.
Optionally, referring to shown in Fig. 2 or Fig. 3, the detection circuit includes at least four divider resistances and three sampling electricity
Resistance；It exchanges and has been sequentially connected in series the first divider resistance between the auxiliary generator winding neutral point and vehicle frame the earth of diesel locomotive
With the first sampling resistor；The second divider resistance and the have been sequentially connected in series between excitation power supply winding neutral point and vehicle frame the earth
Two sampling resistors；Third divider resistance and third sampling resistor have been sequentially connected in series between battery positive voltage and vehicle frame the earth；
Third divider resistance, third sampling resistor and the 4th partial pressure have been sequentially connected in series between battery positive voltage and battery terminal negative
Resistance, alternatively, being sequentially connected in series third divider resistance, the 4th divider resistance between battery positive voltage and battery terminal negative.
Wherein, it optionally designs circuit structure accordingly according to the resistance value of different divider resistances and sampling resistor or increases the number of resistance
Amount.
That is, the application, which mainly passes through 2 high-tension resistive connection auxiliary generator power supply winding neutral points, closes excitation power supply
Between winding neutral point and vehicle frame the earth, when ground fault is not present in main circuit, sampling resistor no current passes through, i.e., voltage is examined
Surveying is 0V, and when there is AC earth or DC ground fault, grounding point is formed into a loop by vehicle frame the earth, on sampling resistor
Can accordingly occur exchanging or direct current or hand over straight blended voltage signals.Accumulator anode and cathode is connected by 3 high-tension resistives, when
When the no ground failure in battery circuit, sampling resistor voltage is fixed value, when battery circuit is there are when ground fault, either
Positive ending grounding or negativing ending grounding, the voltage on sampling resistor can all change therewith.Further pass through detection sampling resistor at this time
On voltage, can realize the quantitative analysis to Grounding.
Voltage detection unit is detected and is sent for the voltage to the sampling resistor both ends in the detection circuit
It is adjusted in unit to voltage ratio；Namely need to acquire the electric current change of corresponding sampling resistor on every a kind of ground path accordingly
Change, therefore the application can also be grounded detection by detecting the variation of electric current.
Voltage ratio adjusts unit, for voltage signal to be carried out scaling and output signal is sent to friendship respectively
Flow signal processing unit and direct current signal processing unit；Referring to shown in Fig. 4, the tune of voltage signal is realized using operational amplifier
Section, specifically, the input signal on sampling resistor is generally 0VDC~12VDC and peak value is 15VAC voltage signal, a-c cycle
For 30Hz~107Hz, voltage magnitude is zoomed within -10V~+10V to after input signal progress scaling, is facilitated subsequent
A/D conversion process.Signal processing efficiency both can be improved in this way, and improved the accuracy of signal processing.
AC signal processing unit, for carrying out blocking stream process to input signal, output AC signal to A/D is converted single
Member；
Direct current signal processing unit, for handle every exchange to input signal, output direct current signal to A/D is converted single
Member；
Optionally, the AC signal processing unit includes capacitance unit, half-wave shaping unit, reversed sum-average arithmetic
Value circuit and amplifier follow unit；AC signal passes sequentially through capacitance unit, half-wave shaping unit, reversed sum-average arithmetic
Value circuit and amplifier follow the cell processing AC signal that obtains that treated；
The direct current signal processing unit includes that low-pass filter unit and amplifier follow unit；Direct current signal passes sequentially through low
Pass filtering unit and amplifier follow the cell processing direct current signal that obtains that treated.
It referring to Figure 5, is the block diagram of alternating current-direct current signal processing provided by the invention.By the way that AC signal and direct current are believed
It number is respectively processed, so that AC, DC mixed signal after adjustment ratio carry out separating processing, AC signal passes through capacitance
Afterwards, half-wave shaping is carried out, after averaging with original signal progress summation operation, amplifier is carried out and follows, be finally sent to D/A and turn
In changing.DC signal is followed by low-pass filtering, amplifier, is sent to D/A and is converted.Therefore input signal corresponds to two-way output letter all the way
Number, AC signal and direct current signal are separately handled, earthing detection refinement easily can be judged that ground fault connects for direct current
Earth fault or AC earth failure.
A/D converting unit, for converting analog signals into digital signal and being output in isolated location；Wherein, A/D turns
It changes unit and corresponds to chip using common technical grade chip, precision is higher.
Optionally, the A/D converting unit could alternatively be comparator, the ground signalling for that will input and preset door
Threshold value, which is compared and exports comparison result, gives CPU control unit.
Isolated location, for signal to be carried out isolation processing, so that corresponding electric signal separates and is output to CPU control
In unit；
Optionally, the isolated location is real using one of Magnetic isolation, sensor isolation, analog isolation or various ways
Existing signal isolation.Wherein, external high pressure system and internal weakness low-pressure system signal can electrically be divided by Magnetic isolation
From.
Optionally, the AC signal processing unit is first output to the output signal of direct current signal processing unit is isolated list
Member carries out isolation processing, is then input to A/D converting unit and carries out conversion process.
CPU control unit obtains earthing detection result for carrying out control calculating to input signal.
Referring to shown in Fig. 6,0~10V voltage signal is first subjected to A/D conversion, A/D change data interface is that serial ports SPI connects
Mouthful, serial data interface has the few feature of semaphore, facilitates the digital isolation of progress, and the digital signal by number isolation enters
CPU control unit, digital signal can be reduced to the voltage magnitude of sampling resistor sampling by operation by CPU, and can be marked
Know is direct current signal or AC signal.
As can be seen from the above embodiments, herein described automation ground detection device, by being directed to every ground fault line
Road constructs corresponding measuring circuit respectively and is connect by the voltage realization that measurement is located at the sampling resistor both ends in measuring circuit
The quantized data of ground situation obtains, and then passes through voltage ratio adjustment, alternating current-direct current signal processing, A/D conversion and isolation processing
Etc. processes split accordingly and optimization processing to providing, finally by certain data calculate analysis can obtain ground connection therefore
The analysis of the type of barrier and corresponding ground connection degree.Therefore, the automation ground detection device can accurately realize fault point
Positioning and fault degree and fault type judgement, enable vehicle-mounted microcomputer directly by testing result carry out ground connection therefore
Barrier investigation and processing, improve the efficiency and intelligence degree of troubleshooting.
Further, in some alternative embodiments, detection device further includes communication unit, for being controlled according to the CPU
The testing result exported in unit processed is transferred to accordingly in locomotive control network, realizes corresponding safeguard measure.
Referring to shown in Fig. 7, CPU sends MVB network for earthing detection data, facilitates locomotive by access dual port RAM
Main control unit carries out protection control, which can be omitted, but if earthing detection unit must be controlled independently without network
System, and display can not show earthing detection data and failure.
Referring to shown in Fig. 8, for a kind of flow chart of the one embodiment for automating ground detecting method provided by the invention.
The detection method first choice needs to construct earthing detection circuit accordingly for different grounding paths, and sets in each circuit
Sampling resistor is set for voltage detecting；
The ground detecting method includes:
Step 101, detection obtains the voltage value at each sampling resistor both ends；
Step 102, the voltage value at sampling resistor both ends is handled by voltage ratio adjustment, so that the voltage that output obtains
Signal is conducive to subsequent signal conversion processes；
Step 103, alternating current-direct current mixed signal adjusted is passed through blocking stream process elimination DC component respectively to obtain entirely
Wave AC signal eliminates DC component by filtering processing and obtains pure direct current signal；
Step 104, analog-to-digital conversion is carried out respectively to the AC signal for the treatment of process and direct current signal to believe the simulation of input
Number be converted to digital signal；
Step 105, isolation processing is carried out to the digital signal after conversion, so that signal carries out electrical separation；
Step 106, the signal after isolation is controlled and is calculated by CPU control unit, obtain earthing detection result.
In some optional embodiments of the application, it is described obtain earthing detection result after further include: will test result
It is transferred in locomotive control network, so that locomotive realizes safeguard measure corresponding with earthing detection data.
As can be seen from the above embodiments, although herein described automation ground detection device and method are only to exchange internal combustion
It is illustrated for machine, but is equally applicable to have in the relevant device of similar ground fault with exchange internal combustion engine.The application
The detection device and detection method have at least the following advantages:
(1) detection of automation will be improved to by human eye judgement in the prior art.Since main circuit of electric locomotive is grounded, in addition to
Except damaging to locomotive equipment, hidden danger can be more brought to vehicle crew's personal safety, and the application passes through automation
Detection, vehicle-mounted microcomputer can make breakdown judge at the first time by testing result, carry out the safeguard measure such as unloading to locomotive, mention
High security.
(2) former ground detecting method can only judge whether ground fault occurs, and can not judge the severity of ground fault,
Sampling of the application to earth current can judge automatically the size and fault mode of earth current.
(3) the current program is shunt in 4400HP internal combustion and is used in batches, and driver can be direct by Vehicular display device
Current locomotive Grounding and insulation situation are inquired, vehicle-mounted microcomputer is grounded data progress grounding alarm by real-time monitoring, connects
The modes such as earth fault record and ground fault unloading carry out ground protection measure.
It should be understood by those ordinary skilled in the art that: the discussion of any of the above embodiment is exemplary only, not
It is intended to imply that the scope of the present disclosure (including claim) is limited to these examples；Under thinking of the invention, above embodiments
Or can also be combined between the technical characteristic in different embodiments, step can be realized with random order, and be existed such as
Many other variations of the upper different aspect of the invention, for simplicity, they are not provided in details.
In addition, to simplify explanation and discussing, and in order not to obscure the invention, it can in provided attached drawing
It is connect with showing or can not show with the well known power ground of integrated circuit (IC) chip and other components.Furthermore, it is possible to
Device is shown in block diagram form, to avoid obscuring the invention, and this has also contemplated following facts, i.e., about this
The details of the embodiment of a little block diagram arrangements be height depend on will implementing platform of the invention (that is, these details should
It is completely within the scope of the understanding of those skilled in the art).Elaborating that detail (for example, circuit) is of the invention to describe
In the case where exemplary embodiment, it will be apparent to those skilled in the art that can be in these no details
In the case where or implement the present invention in the case that these details change.Therefore, these descriptions should be considered as explanation
Property rather than it is restrictive.
Although having been incorporated with specific embodiments of the present invention, invention has been described, according to retouching for front
It states, many replacements of these embodiments, modifications and variations will be apparent for those of ordinary skills.Example
Such as, discussed embodiment can be used in other memory architectures (for example, dynamic ram (DRAM)).
The embodiment of the present invention be intended to cover fall into all such replacements within the broad range of appended claims,
Modifications and variations.Therefore, all within the spirits and principles of the present invention, any omission, modification, equivalent replacement, the improvement made
Deng should all be included in the protection scope of the present invention.
Claims (10)
1. a kind of automation ground detection device characterized by comprising
For constructing corresponding measure loop based on different grounding paths, and sampling is arranged in detection circuit in measure loop
Resistance；
Voltage detection unit is detected for the voltage to the sampling resistor both ends in the detection circuit and is sent to electricity
It presses in proportion adjustment unit；
Voltage ratio adjusts unit, for voltage signal to be carried out scaling and output signal is sent to exchange letter respectively
Number processing unit and direct current signal processing unit；
AC signal processing unit, for carrying out blocking stream process, output AC signal to A/D converting unit to input signal；
Direct current signal processing unit, for handle every exchange to input signal, output direct current signal to A/D converting unit；
A/D converting unit, for converting analog signals into digital signal and being output in isolated location；
Isolated location, for signal to be carried out isolation processing, so that corresponding electric signal separates and is output to CPU control unit
In；
CPU control unit obtains earthing detection result for carrying out control calculating to input signal.
2. detection device according to claim 1, which is characterized in that the detection circuit includes at least four divider resistances
With three sampling resistors；The first partial pressure has been sequentially connected in series between the auxiliary generator winding neutral point and vehicle frame the earth of locomotive
Resistance and the first sampling resistor；The second divider resistance has been sequentially connected in series between excitation power supply winding neutral point and vehicle frame the earth
With the second sampling resistor；Third divider resistance and third sampling electricity have been sequentially connected in series between battery positive voltage and vehicle frame the earth
Resistance；Third divider resistance, third sampling resistor and the 4th have been sequentially connected in series between battery positive voltage and battery terminal negative
Divider resistance, alternatively, being sequentially connected in series third divider resistance, the 4th partial pressure electricity between battery positive voltage and battery terminal negative
Resistance.
3. detection device according to claim 1, which is characterized in that the AC signal processing unit includes capacitance
Unit, half-wave shaping unit, reversed sum average value circuit and amplifier follow unit；
AC signal passes sequentially through capacitance unit, half-wave shaping unit, reversed sum average value circuit and amplifier and follows
Cell processing obtains that treated AC signal；
The direct current signal processing unit includes that low-pass filter unit and amplifier follow unit；
Direct current signal passes sequentially through low-pass filter unit and amplifier follows the cell processing direct current signal that obtains that treated.
4. detection device according to claim 1, which is characterized in that the isolated location using Magnetic isolation, sensor every
Signal isolation is realized from one of, analog isolation or various ways.
5. detection device according to claim 1, which is characterized in that at the AC signal processing unit and direct current signal
The output signal of reason unit is first output to isolated location and carries out isolation processing, is then input to A/D converting unit and carries out at conversion
Reason.
6. detection device according to claim 1, which is characterized in that the A/D converting unit replaces with comparator, is used for
The ground signalling of input is compared with preset threshold value and exports comparison result and gives CPU control unit.
7. detection device according to claim 1, which is characterized in that further include communication unit, for being controlled according to the CPU
The testing result exported in unit processed is transferred to accordingly in locomotive control network, realizes corresponding safeguard measure.
8. a kind of automation ground detecting method, which is characterized in that construct earthing detection accordingly for different grounding paths
Circuit, and sampling resistor is set in each circuit and is used for voltage detecting；
The ground detecting method includes:
Detection obtains the voltage value at each sampling resistor both ends；
The voltage value at sampling resistor both ends is handled by voltage ratio adjustment, so that after the voltage signal that output obtains is conducive to
Continuous signal conversion processes；
Alternating current-direct current mixed signal adjusted is passed through into blocking stream process elimination DC component respectively and obtains full-wave AC signal, is led to
It crosses filtering processing elimination DC component and obtains pure direct current signal；
AC signal and direct current signal to treatment process carry out analog-to-digital conversion respectively and the analog signal of input are converted to number
Signal；
Isolation processing is carried out to the digital signal after conversion, so that signal carries out electrical separation；
The signal after isolation is controlled and calculated by CPU control unit, obtains earthing detection result.
9. detection method according to claim 8, which is characterized in that the isolation processing include Magnetic isolation, sensor every
From one of, analog isolation or various ways.
10. detection method according to claim 8, which is characterized in that it is described obtain earthing detection result after further include:
It will test result to be transferred in locomotive control network, so that locomotive realizes safeguard measure corresponding with earthing detection data.
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110880800A (en) * | 2019-11-27 | 2020-03-13 | 何雪平 | Charging connector for state display |
| CN113933646A (en) * | 2021-09-22 | 2022-01-14 | 中航光电科技股份有限公司 | Circuit and method for detecting voltage and grounding of low-voltage distribution network |
| CN113985177A (en) * | 2021-10-29 | 2022-01-28 | 江铃汽车股份有限公司 | Method and device for quickly diagnosing 48V system fault of hybrid electric vehicle |
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| CN2705337Y (en) * | 2004-05-13 | 2005-06-22 | 株洲联诚集团富力实业有限责任公司 | Passive earthing detector |
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| CN104457850A (en) * | 2014-12-02 | 2015-03-25 | 中国船舶工业集团公司第七〇八研究所 | Signal processing system and method |
| CN106711932A (en) * | 2017-01-04 | 2017-05-24 | 山东中大电源科技有限公司 | DC side ground fault protection device in DC power supply system |
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| CN110880800A (en) * | 2019-11-27 | 2020-03-13 | 何雪平 | Charging connector for state display |
| CN113933646A (en) * | 2021-09-22 | 2022-01-14 | 中航光电科技股份有限公司 | Circuit and method for detecting voltage and grounding of low-voltage distribution network |
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