CN108414875A - A kind of localization method and system of the large-scale enclosed busbar shell Abnormal Grounding of detection - Google Patents
A kind of localization method and system of the large-scale enclosed busbar shell Abnormal Grounding of detection Download PDFInfo
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- CN108414875A CN108414875A CN201810208928.7A CN201810208928A CN108414875A CN 108414875 A CN108414875 A CN 108414875A CN 201810208928 A CN201810208928 A CN 201810208928A CN 108414875 A CN108414875 A CN 108414875A
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- enclosed busbar
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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
Abstract
The invention discloses the localization methods and system of a kind of large-scale enclosed busbar shell Abnormal Grounding of detection.The system comprises：Current lifting device, induced electric field measuring device and Abnormal Grounding positioning device.The present invention to enclosed busbar shell to be measured by inputting preset alternating current, and along enclosed busbar direction to be measured, by away from the induced electric field data for measuring measurement point on enclosed busbar shell to be measured, whether it is more than pre-set threshold value finally by the induced electric field difference between two neighboring measurement point, quickly to position the position of Abnormal Grounding, the positioning system of the detection large size enclosed busbar shell Abnormal Grounding is used in this way, the position of quickly positioning Abnormal Grounding may be implemented, compared to artificial visual detection method, both working efficiency is greatly improved, shorten the problem investigation period, engineering cost is saved, and trouble shoot success rate is high, the missing inspection manually searched can effectively be avoided, it improves and checks on the quality, Checking on effect is ensured.
Description
Technical field
The present invention relates to overhaul of the equipments technical field, more particularly to a kind of large-scale enclosed busbar shell Abnormal Grounding of detection
Localization method and system.
Background technology
Large nuclear-power factory and conventional power plant generator outlet to main transformer, main transformer to booster stations are mostly used from mutually closing
Bus structure is contained high-current conductor with metal shell, and designing to have the ground connection of metal shell will strictly go, generally
Single-point grounding or multipoint earthing.And insulating element aging, due to live cross-operation is complicated and dirty etc., scene occurs
The case where other Abnormal Grounding points, is no longer a small number of, and fault point is hidden sometimes, and the method for conventional manpower inspection is difficult the institute that pinpoints the problems
Larger problem is being brought to engineering construction.
Since enclosed busbar volume is big, length is long, in-site installation narrow space, is mounted on height certain inside and outside workshop,
Occur workshop top-bottom cross operation conductive body (cable tray, scaffold or pipeline etc.) touch, cross-over block and gum cover tide
Situations such as wet, dirty, aging, easily introduces other abnormal earth points, and since shell insulation against ground number of packages amount is more, distribution is wide,
The place for Abnormal Grounding problem occur every time is not quite similar, and can only apply the strategy of throwing waves of people into action and carry out inch-by-inch search：It examines by visual observation
The mode looked into, more personnel, multifrequency time are searched.Using artificial lookup method, there are following defect problems：
Defect one, average long in time limit, inefficiency：Some Abnormal Grounding points ten minutes are hidden, such as gum cover insulation degradation, hidden
Cable tray overlap joint covered etc., the average trouble-shoots duration reaches 20 days or more, to the engineering master of nuclear power and conventional electric power project
The line duration affects greatly, and is unfavorable for the control of project cost；
Defect two, trouble shoot success rate be not high：Visual inspection can only see the Abnormal Grounding point in some angulars field of view,
The region for the blind area that can not be reached for personnel can not then check, hidden insulation degradation (such as insulating gum cover aging) also without
Method inspection causes to be handled even if most of Abnormal Grounding, but the underproof problem that remains unchanged that insulate；
Invention content
In order to solve problems in the prior art, an embodiment of the present invention provides a kind of large-scale enclosed busbar shell of detection is abnormal
The localization method and device of ground connection.The technical solution is as follows：
On the one hand, an embodiment of the present invention provides a kind of positioning system of the large-scale enclosed busbar shell Abnormal Grounding of detection,
Including：
Current lifting device is connect with one end of enclosed busbar shell to be measured, preset for being inputted to enclosed busbar shell to be measured
Alternating current；
Induced electric field measuring device, for along enclosed busbar direction to be measured, by being surveyed on enclosed busbar shell to be measured away from measuring
Measure the induced electric field data of point；
Whether Abnormal Grounding positioning device, the difference for judging induced electric field between all two adjacent measurement points are big
In pre-set threshold value；
The Abnormal Grounding positioning device is additionally operable to when there are the induced electric field differences between two neighboring measurement point to be more than
When pre-set threshold value, confirm between the two neighboring measurement point having differences have Abnormal Grounding.
It is described to induct in the positioning system of the large-scale enclosed busbar shell Abnormal Grounding of the above-mentioned detection of the embodiment of the present invention
Field measurement device is additionally operable to confirm in Abnormal Grounding positioning device when having Abnormal Grounding between two adjacent measurement points,
New measurement point is chosen between two adjacent measurement points, and acquires the induced electric field data of new measurement point；
The Abnormal Grounding positioning device is additionally operable to judge two measurement points that new measurement point is adjacent with new measurement point respectively
Between induced electric field difference, if be more than pre-set threshold value；
The Abnormal Grounding positioning device is additionally operable to when the electricity of inducting between new measurement point and one of adjacent measurement points
When field difference is more than pre-set threshold value, confirm between two measurement points having differences have Abnormal Grounding.
It is described to induct in the positioning system of the large-scale enclosed busbar shell Abnormal Grounding of the above-mentioned detection of the embodiment of the present invention
Field measurement device includes：
Horizontal antenna is parallel to enclosed busbar extending direction to be measured and places, the induced electric field signal for acquiring measurement point；
Signal handling equipment, signal input port is connected by the both ends of cable and horizontal antenna, for handling and showing
Show collected induced electric field signal.
In the positioning system of the large-scale enclosed busbar shell Abnormal Grounding of the above-mentioned detection of the embodiment of the present invention,
In the positioning system of the large-scale enclosed busbar shell Abnormal Grounding of the above-mentioned detection of the embodiment of the present invention, the signal
Processing equipment includes：
Differential amplifier circuit, for amplifying collected induced electric field signal；
Analog-digital converter is electrically connected with differential amplifier circuit, for amplified induced electric field signal to be converted to and can show
The digital signal shown；
Digital display is electrically connected with analog-to-digital conversion device, for showing the digital signal converted；
Power supply is connect with differential amplifier circuit, analog-digital converter, digital display respectively, for being signal handling equipment
Power supply.
In the positioning system of the large-scale enclosed busbar shell Abnormal Grounding of the above-mentioned detection of the embodiment of the present invention, the level
The length of antenna is 0.8~1.2m.
In the positioning system of the large-scale enclosed busbar shell Abnormal Grounding of the above-mentioned detection of the embodiment of the present invention, the level
Insulating layer is set with outside antenna, the cable is shielded cable, and the signal handling equipment is arranged in shielding box.
In the positioning system of the large-scale enclosed busbar shell Abnormal Grounding of the above-mentioned detection of the embodiment of the present invention, the level
Antenna midpoint is vertically installed with liftable insulating supporting structure, the short distance for keeping horizontal antenna and enclosed busbar shell
Contact.
On the other hand, an embodiment of the present invention provides a kind of positioning sides of the large-scale enclosed busbar shell Abnormal Grounding of detection
Method uses the positioning system of above-mentioned detection large size enclosed busbar shell Abnormal Grounding, the method includes：
Preset alternating current is inputted to one end of enclosed busbar shell to be measured；
Using preset induced electric field measuring device, along enclosed busbar direction to be measured, outside away from measurement enclosed busbar to be measured
The induced electric field data of measurement point on shell；
Judge whether the difference of induced electric field between all two adjacent measurement points is more than pre-set threshold value；
It is more than pre-set threshold value if there is the induced electric field difference between two neighboring measurement point, then confirmation has differences
There is Abnormal Grounding between two neighboring measurement point.
In the localization method of the large-scale enclosed busbar shell Abnormal Grounding of the above-mentioned detection of the embodiment of the present invention, the method
Further include：
When having Abnormal Grounding between confirming two adjacent measurement points, chosen between two adjacent measurement points new
Measurement point, and acquire the induced electric field data of new measurement point；
The difference of the induced electric field between new measurement point two measurement points adjacent with new measurement point is judged respectively, if big
In pre-set threshold value；
If newly the induced electric field difference between measurement point and one of adjacent measurement points is more than pre-set threshold value, confirm
There is Abnormal Grounding between two measurement points having differences.
It is described when true in the localization method of the large-scale enclosed busbar shell Abnormal Grounding of the above-mentioned detection of the embodiment of the present invention
Recognize between two adjacent measurement points when having Abnormal Grounding, new measurement point is chosen between two adjacent measurement points, and
The induced electric field data of new measurement point are acquired, including：
When having Abnormal Grounding between confirming two adjacent measurement points, in choosing between two adjacent measurement points
Point acquires the induced electric field data at midpoint as new measurement point.
The advantageous effect that technical solution provided in an embodiment of the present invention is brought is：
By inputting preset alternating current to enclosed busbar shell to be measured, and along enclosed busbar direction to be measured, by away from survey
The induced electric field data for measuring measurement point on enclosed busbar shell to be measured, finally by the induced electric field between two neighboring measurement point
Whether difference is more than pre-set threshold value, quickly to position the position of Abnormal Grounding, uses the detection large size enclosed busbar shell in this way
The position for quickly positioning Abnormal Grounding may be implemented, compared to artificial visual detection method, both greatly in the positioning system of Abnormal Grounding
Working efficiency is improved greatly, shortens the time between overhauls(TBO), has saved engineering cost, and trouble shoot success rate is high, can effectively keep away
The missing inspection that manpower-free searches, improves and checks on the quality, ensured Checking on effect.
Description of the drawings
To describe the technical solutions in the embodiments of the present invention more clearly, make required in being described below to embodiment
Attached drawing is briefly described, it should be apparent that, drawings in the following description are only some embodiments of the invention, for
For those of ordinary skill in the art, without creative efforts, other are can also be obtained according to these attached drawings
Attached drawing.
Fig. 1 is a kind of positioning system for detection large size enclosed busbar shell Abnormal Grounding that the embodiment of the present invention one provides
Structural schematic diagram；
Fig. 2 is a kind of positioning system work for detection large size enclosed busbar shell Abnormal Grounding that the embodiment of the present invention one provides
Make principle exemplary plot；
Fig. 3 is a kind of positioning system for detection large size enclosed busbar shell Abnormal Grounding that the embodiment of the present invention one provides
Concrete structure schematic diagram；
Fig. 4 is a kind of localization method of the large-scale enclosed busbar shell Abnormal Grounding of detection provided by Embodiment 2 of the present invention
Flow chart.
Specific implementation mode
To make the object, technical solutions and advantages of the present invention clearer, below in conjunction with attached drawing to embodiment party of the present invention
Formula is described in further detail.
Embodiment one
An embodiment of the present invention provides a kind of positioning systems of the large-scale enclosed busbar shell Abnormal Grounding of detection, are suitable for each
Class power plant, electric substation are to large-scale enclosed busbar shell due to failure caused by ground connection abnormal (few earth point has more earth point)
Analysis and processing, referring to Fig. 1, which may include：
Current lifting device 1 is connect with one end of enclosed busbar shell to be measured, preset for being inputted to enclosed busbar shell to be measured
Alternating current.
Induced electric field measuring device 2, for along enclosed busbar direction to be measured, by being surveyed on enclosed busbar shell to be measured away from measuring
Measure the induced electric field data of point.
Abnormal Grounding positioning device 3, for judge induced electric field between all two adjacent measurement points difference whether
More than pre-set threshold value.
Abnormal Grounding positioning device 3 is additionally operable to when there are the induced electric field differences between two neighboring measurement point to be more than in advance
If when threshold values, confirming between the two neighboring measurement point having differences have Abnormal Grounding.
In the present embodiment, using current lifting device 1 industrial-frequency alternating current is injected from enclosed busbar shell to be measured one end lower housings
Source, size of current, which can measure to differentiate with the data of induced electric field, to be advisable.When being passed through alternating current in conductor, around by generate friendship
The magnetic field of change and the electric field of alternation, this electric field are known as eddy electric field or induced electric field, electric field strength in conductor electric current it is big
Small, alternative frequency is related.According to Maxwell's Theory of Electromagnetic Field, when enclosed busbar shell to be measured is there are when Abnormal Grounding point, such as
Fruit is passed through certain alternating current (being provided using current lifting device 1) in enclosed busbar shell (generally aluminum material), to be measured
Enclosed busbar ambient envelope will be generated around the toroidal magnetic field of busbar circumference and along the axial induced electric field of generatrix direction.If deposited
In Abnormal Grounding, then shunting function can be generated to the alternating current being passed through in enclosed busbar shell so that Abnormal Grounding both sides
Apparent transition occurs for induced electric field, and then can judge the position of Abnormal Grounding accordingly.
The illustratively relationship in induced electric field and enclosed busbar shell between alternating current below, specifically, with electrostatic
Field is different, and induced electric field belongs to rotational field, circular rector field, according to Maxwell's law of electromagnetic induction：The circular rector of induced electric field integrates
Equal to the Line Integral of flux change amount, i.e.,：
From the above equation, we can see that cannot be satisfied requirement using unlimited long straight conductor model, the electricity of inducting of one closure of structure is needed
Field model, present invention employs ring-shaped current models, calculate magnetic flux Line Integral first, use (1) formula and find out induced electric field
Eg, the case where then considering to be far smaller than its radius with a distance from annulus, you can be considered the approximate processing of long straight conductor model.
By theory deduction, show that the induced electric field expression formula inside and outside ring-shaped current is respectively：
Wherein, Eg(a0) it is induced electric field intensity, a0For the distance apart from the annulus center of circle in plane, R is the radius of annulus,
μ0For dielectric constant,For the change rate of alternating current in annulus.
When two particles inside and outside annulus are equal with a distance from torus, and for the one thousandth of R belowWhen, particle is minimum with respect to annulus curvature, and the induced electric field at this 2 point is substantially close, can be approximately considered this
Shi Yuanhuan is long straight conductor model to 2 points of the model, and formula (2), (3) can be used as the approximation of long straight conductor induced electric field
Expression formula.I.e. by above-mentioned formula (2) and (3) Lai the pass between almost quantitative analysis induced electric field and measurement point alternating current
System, and then can be inferred that the influence that Abnormal Grounding generates induced electric field, provide the theoretical foundation of Abnormal Grounding judgement.
Participate in Fig. 2, it is assumed that there are two groups of Abnormal Grounding point g on enclosed busbar shell1、g2, when use 1 Injection Current of current lifting device
I1When, it is respectively Ig from two Abnormal Grounding point earth currents1、Ig2, bus current is respectively I1、I2、I3, since right side is without connecing
Place, therefore I3It is close to 0, magnetic induction density B3And induced electric field intensity E3Essentially 0, only environmental disturbances, in earth point g2
The induced electric field of left and right will have apparent transition (i.e. the difference of induced electric field is more than pre-set threshold value), be filled if being measured by induced electric field
Set the g measured2Left side induced electric field size is higher than environmental disturbances by a relatively large margin, then Abnormal Grounding point g2It will be carried out accurate
Positioning.Similarly, due to the presence of multipoint earthing shunting function, Abnormal Grounding point g1 both sides electric current I1>I2, in earth point g1Place is left
Right induced electric field E1>E2(i.e. E1And E2Difference be more than pre-set threshold value), then Abnormal Grounding point g1It can also realize and be accurately positioned.
In practical application, Abnormal Grounding positioning device 3 can be the computer etc. of installation corresponding data processing software, and induced electric field measures
The induced electric field data that device 2 acquires can be importing directly into Abnormal Grounding positioning device 3, can also be manually entered, certainly,
The work of Abnormal Grounding positioning device 3 can also be by manually replacing completing, but computational efficiency is low, can coordinate in calculation amount hour
It uses, is not limited here.In addition, the setting of pre-set threshold value, facilitates deciding on whether collected induced electric field is due to different
The transition for being often grounded and generating excludes interference of the environmental factor to induced electric field measuring device 2.
Optionally, in order to further be accurately positioned Abnormal Grounding point, induced electric field measuring device 2 is additionally operable to connect extremely
Ground positioning device confirms when having Abnormal Grounding between two adjacent measurement points, is chosen between two adjacent measurement points new
Measurement point, and acquire the induced electric field data of new measurement point.
Abnormal Grounding positioning device 3, be additionally operable to judge respectively new measurement point two measurement points adjacent with new measurement point it
Between induced electric field difference, if be more than pre-set threshold value.
Abnormal Grounding positioning device 3 is additionally operable to when the induced electric field between new measurement point and one of adjacent measurement points
When difference is more than pre-set threshold value, confirm between two measurement points having differences have Abnormal Grounding.
In the present embodiment, if it have been confirmed that the induced electric field difference there are two depositing between adjacent measurement points is more than default valve
When value (having Abnormal Grounding between the two measurement points), a new measurement point is reselected between the two measurement points
(new measurement point is preferably the midpoint between the two measurement points, can if midpoint has other equipment and is unable to measure
At midpoint, attachment selects new measurement point), and judge respectively between new measurement point two measurement points adjacent with new measurement point
The difference of induced electric field, if be more than pre-set threshold value, if new electricity of inducting between measurement point and one of adjacent measurement points
Field difference is more than pre-set threshold value, then judges Abnormal Grounding between new measurement point and above-mentioned measurement point, can further contract in this way
Range residing for small Abnormal Grounding repeats aforesaid operations process, Abnormal Grounding can be accurately positioned.
Optionally, referring to Fig. 3, induced electric field measuring device 2 may include：
Horizontal antenna 21 is parallel to enclosed busbar extending direction to be measured and places, and the induced electric field for acquiring measurement point is believed
Number；
Signal handling equipment 22, signal input port is connect by cable 23 with the both ends of horizontal antenna 21, for locating
It manages and shows collected induced electric field signal.
In the present embodiment, consider that the intensity of electromotive force signal in horizontal antenna 21 is directly proportional to length, horizontal antenna 21
It is unsuitable too short, but horizontal antenna 21 is long that it will cause the inconvenience of operation and the decline of positioning resolution, combine antenna are long
Degree is taken as 0.8~1.2m, and (when horizontal antenna 21 is set as 1m, the alternating current of 40A can be used i.e. in current lifting device 1 to preferably 1m
Can meet data acquisition demand), in addition, due to electric field strength with current source distance change, distance nearlyr signal it is stronger, and
Interference is weaker, is directly close together most preferably with enclosed busbar shell, it is preferred that it is set with insulating layer outside horizontal antenna 21,
It is directly close together with enclosed busbar shell when measurement.21 both ends of horizontal antenna are connected by cable 23 and signal handling equipment 22
It connects, if using general cable, when it moves towards not exclusively vertical with enclosed busbar shell, the projection in horizontal direction is grown
Degree can also induce induced electric field, be offseted with the induced electric field of horizontal antenna, cause to measure the introducing interfered, therefore preferably
Ground, cable 23 use shielded cable, meanwhile, the outside electromagnetic interference in order to prevent of signal handling equipment 22 need to use shielding box.
Further, referring to Fig. 3, signal handling equipment 22 may include：
Differential amplifier circuit 221, for amplifying collected induced electric field signal.
Analog-digital converter 222 is electrically connected with differential amplifier circuit 221, for converting amplified induced electric field signal
At displayable digital signal.
Digital display 223 is electrically connected with analog-to-digital conversion device, for showing the digital signal converted.
Power supply 224 is connect with differential amplifier circuit, analog-digital converter, digital display respectively, for being set for signal processing
Available electricity.
In the present embodiment, since the induced electromotive force signal in horizontal antenna 21 belongs to weak signal, and two-termial line can
External interference can be introduced, 22 anti-interference ability of signal handling equipment is can effectively improve using differential amplifier circuit, improves data
Readability.Meanwhile being packaged and showing using special A/D digital display modules, than using multimeter measurement can be further
Improve the integrated level and and operability of device.
Further, referring to Fig. 3,21 midpoint of horizontal antenna is vertically installed with liftable insulating supporting structure 24, is used for
Keep the close contact of horizontal antenna and enclosed busbar shell.
In the present embodiment, since enclosed busbar installation site is generally apart from ground 3m or more, the height in main transformer region exists
10m or more, in order to avoid the overlap joint of shell and scaffold, most of scaffold needs to remove after installation completion, in the case
Personnel, which carry out inch-by-inch search, has high falling risk, safety guarantee problem to highlight, and liftable insulation is equipped with for horizontal antenna 21
Support construction 24 can facilitate testing staff directly to measure operation on ground, and without setting up scaffold, measure work safety
It is convenient.
In the present embodiment, the positioning system of the detection large size enclosed busbar shell Abnormal Grounding overcomes original visual
The shortcomings that earth point scheme is long in time limit and there are personnel safeties is searched, by technology upgrading, uses the non-of test induced electric field
Contact method can obtain the output of high-resolution by theoretical calculation and actual measurement in relatively low power current, accurate
True property is strong, short time limit, safe.Simultaneously because induced electric field and the equidirectional feature of electric current, enclosed busbar enclosure current are
Horizontal direction, earth current are vertical direction, and antenna is vertical with the electric current that it is grounded direction when horizontal positioned, and measurement result will not
It is influenced by vertical direction earth current induced electric field, strong antijamming capability.
The embodiment of the present invention to enclosed busbar shell to be measured by inputting preset alternating current, and along enclosed busbar to be measured
Direction, by away from the induced electric field data for measuring measurement point on enclosed busbar shell to be measured, finally by two neighboring measurement point it
Between induced electric field difference whether be more than pre-set threshold value, quickly to position the position of Abnormal Grounding, use the detection large-scale in this way
The position for quickly positioning Abnormal Grounding may be implemented, compared to artificial visual in the positioning system of enclosed busbar shell Abnormal Grounding
Detection method both greatly improves working efficiency, shortens the time between overhauls(TBO), has saved engineering cost, and trouble shoot success
Rate is high, can effectively avoid the missing inspection manually searched, improve and check on the quality, ensured Checking on effect.
Embodiment two
An embodiment of the present invention provides a kind of localization methods of the large-scale enclosed busbar shell Abnormal Grounding of detection, use reality
The positioning system described in example one is applied, referring to Fig. 4, this method may include：
Step S11 inputs preset alternating current to one end of enclosed busbar shell to be measured.
In the present embodiment, current lifting device may be used and inject industrial frequency AC from enclosed busbar shell to be measured one end lower housings
Power supply, size of current, which can measure to differentiate with the data of induced electric field, to be advisable.
Step S12, using preset induced electric field measuring device, along enclosed busbar direction to be measured, by away from measurement envelope to be measured
Close the induced electric field data of measurement point on bus shell.
In the present embodiment, when being passed through alternating current in conductor, around will generate alternation magnetic field and alternation electric field,
This electric field is known as eddy electric field or induced electric field, the size of electric field strength and electric current in conductor, and alternative frequency is related.According to wheat
Ke Siwei Theories of Electromagnetic Field, when enclosed busbar shell to be measured is there are when Abnormal Grounding point, if be passed through in enclosed busbar shell
Certain alternating current will be generated around the toroidal magnetic field of busbar circumference and along generatrix direction in enclosed busbar ambient envelope to be measured
Axial induced electric field.If there is Abnormal Grounding, then shunting can be generated to the alternating current being passed through in enclosed busbar shell and made
With so that apparent transition occurs for the induced electric field of Abnormal Grounding both sides, and then can judge the position of Abnormal Grounding accordingly.
Step S13, judges whether the difference of induced electric field between all two adjacent measurement points is more than pre-set threshold value.
In the present embodiment, the setting of pre-set threshold value facilitates deciding on whether collected induced electric field is due to exception
The transition for being grounded and generating excludes interference of the environmental factor to induced electric field measuring device.
Step S14, is more than pre-set threshold value if there is the induced electric field difference between two neighboring measurement point, then confirms and deposit
There is Abnormal Grounding between the two neighboring measurement point of difference.
Further, in order to accurately judge the position of Abnormal Grounding, Fig. 4 is participated in, this method can also include：
Step S15, when having Abnormal Grounding between confirming adjacent two measurement points, two adjacent measurement points it
Between choose new measurement point, and acquire the induced electric field data of new measurement point.
In the present embodiment, new measurement point is preferably the midpoint between the two measurement points, if midpoint has it
His equipment and when being unable to measure, new measurement point can be selected in midpoint attachment, is not limited here.
Step S16 judges the difference of the induced electric field between new measurement point two measurement points adjacent with new measurement point respectively
Value, if be more than pre-set threshold value.
Step S17, if new induced electric field difference between measurement point and one of adjacent measurement points is more than default valve
Value, then confirm between two measurement points having differences have Abnormal Grounding.
In the present embodiment, if it have been confirmed that the induced electric field difference there are two depositing between adjacent measurement points is more than default valve
When value (having Abnormal Grounding between the two measurement points), a new measurement is reselected between the two measurement points
Point, and the difference of the induced electric field between new measurement point two measurement points adjacent with new measurement point is judged respectively, if it is more than
Pre-set threshold value is sentenced if new induced electric field difference between measurement point and one of adjacent measurement points is more than pre-set threshold value
Disconnected Abnormal Grounding can further reduce the range residing for Abnormal Grounding in this way between new measurement point and above-mentioned measurement point, weight
Multiple aforesaid operations process, can be accurately positioned Abnormal Grounding.
Need to illustrate when, the structure of positioning system used by the localization method describes in detail in embodiment one,
Which is not described herein again.
The embodiment of the present invention to enclosed busbar shell to be measured by inputting preset alternating current, and along enclosed busbar to be measured
Direction, by away from the induced electric field data for measuring measurement point on enclosed busbar shell to be measured, finally by two neighboring measurement point it
Between induced electric field difference whether be more than pre-set threshold value, quickly to position the position of Abnormal Grounding, use the detection large-scale in this way
The position for quickly positioning Abnormal Grounding may be implemented, compared to artificial visual in the localization method of enclosed busbar shell Abnormal Grounding
Detection method both greatly improves working efficiency, shortens the time between overhauls(TBO), has saved engineering cost, and trouble shoot success
Rate is high, can effectively avoid the missing inspection manually searched, improve and check on the quality, ensured Checking on effect.
The embodiments of the present invention are for illustration only, can not represent the quality of embodiment.
It should be noted that：The positioning system for the large-scale enclosed busbar shell Abnormal Grounding of detection that above-described embodiment provides exists
When realizing the localization method of the large-scale enclosed busbar shell Abnormal Grounding of detection, only illustrated with the division of above-mentioned each function module
Illustrate, in practical application, can be completed as needed and by above-mentioned function distribution by different function modules, i.e., it will be in equipment
Portion's structure is divided into different function modules, to complete all or part of the functions described above.In addition, above-described embodiment carries
The positioning system of the large-scale enclosed busbar shell Abnormal Grounding of detection of confession and determining for the large-scale enclosed busbar shell Abnormal Grounding of detection
Position embodiment of the method belongs to same design, and specific implementation process refers to embodiment of the method, and which is not described herein again.
One of ordinary skill in the art will appreciate that realizing that all or part of step of above-described embodiment can pass through hardware
It completes, relevant hardware can also be instructed to complete by program, the program can be stored in a kind of computer-readable
In storage medium, storage medium mentioned above can be read-only memory, disk or CD etc..
The foregoing is merely presently preferred embodiments of the present invention, is not intended to limit the invention, it is all the present invention spirit and
Within principle, any modification, equivalent replacement, improvement and so on should all be included in the protection scope of the present invention.
Claims (10)
1. a kind of positioning system of the large-scale enclosed busbar shell Abnormal Grounding of detection, which is characterized in that including：
Current lifting device is connect with one end of enclosed busbar shell to be measured, for inputting preset alternation to enclosed busbar shell to be measured
Electric current；
Induced electric field measuring device is used for along enclosed busbar direction to be measured, by away from measurement point on measurement enclosed busbar shell to be measured
Induced electric field data；
Abnormal Grounding positioning device, for judging it is pre- whether the difference of induced electric field between all two adjacent measurement points is more than
If threshold values；
The Abnormal Grounding positioning device is additionally operable to when there are the induced electric field differences between two neighboring measurement point more than default
When threshold values, confirm between the two neighboring measurement point having differences have Abnormal Grounding.
2. system according to claim 1, which is characterized in that the induced electric field measuring device is additionally operable to connect extremely
Ground positioning device confirms when having Abnormal Grounding between two adjacent measurement points, is chosen between two adjacent measurement points new
Measurement point, and acquire the induced electric field data of new measurement point；
The Abnormal Grounding positioning device is additionally operable to judge respectively between two measurement points that new measurement point is adjacent with new measurement point
Induced electric field difference, if be more than pre-set threshold value；
The Abnormal Grounding positioning device is additionally operable to when the induced electric field between new measurement point and one of adjacent measurement points is poor
When value is more than pre-set threshold value, confirm between two measurement points having differences have Abnormal Grounding.
3. system according to claim 1, which is characterized in that the induced electric field measuring device includes：
Horizontal antenna is parallel to enclosed busbar extending direction to be measured and places, the induced electric field signal for acquiring measurement point；
Signal handling equipment, signal input port are connected by the both ends of cable and horizontal antenna, are adopted for handling and showing
The induced electric field signal collected.
4. system according to claim 3, which is characterized in that the signal handling equipment includes：
Differential amplifier circuit, for amplifying collected induced electric field signal；
Analog-digital converter is electrically connected with differential amplifier circuit, displayable for amplified induced electric field signal to be converted to
Digital signal；
Digital display is electrically connected with analog-to-digital conversion device, for showing the digital signal converted；
Power supply is connect with differential amplifier circuit, analog-digital converter, digital display respectively, for powering for signal handling equipment.
5. system according to claim 3, which is characterized in that the length of the horizontal antenna is 0.8~1.2m.
6. system according to claim 3, which is characterized in that be set with insulating layer, the cable outside the horizontal antenna
For shielded cable, the signal handling equipment is arranged in shielding box.
7. system according to claim 6, which is characterized in that it is exhausted that the horizontal antenna midpoint is vertically installed with liftable
Edge support construction, the close contact for keeping horizontal antenna and enclosed busbar shell.
8. a kind of localization method of the large-scale enclosed busbar shell Abnormal Grounding of detection, uses described in claim any one of 1-7
System, which is characterized in that the method includes：
Preset alternating current is inputted to one end of enclosed busbar shell to be measured；
Using preset induced electric field measuring device, along enclosed busbar direction to be measured, by away from measurement enclosed busbar shell to be measured
The induced electric field data of measurement point；
Judge whether the difference of induced electric field between all two adjacent measurement points is more than pre-set threshold value；
If there is the induced electric field difference between two neighboring measurement point be more than pre-set threshold value, then confirm have differences it is adjacent
There is Abnormal Grounding between two measurement points.
9. according to the method described in claim 8, it is characterized in that, the method further includes：
When having Abnormal Grounding between confirming two adjacent measurement points, new survey is chosen between two adjacent measurement points
Point is measured, and acquires the induced electric field data of new measurement point；
The difference of the induced electric field between new measurement point two measurement points adjacent with new measurement point is judged respectively, if is more than pre-
If threshold values；
If newly the induced electric field difference between measurement point and one of adjacent measurement points is more than pre-set threshold value, presence is confirmed
There is Abnormal Grounding between two measurement points of difference.
10. according to the method described in claim 9, it is characterized in that, described have between confirming two adjacent measurement points
When Abnormal Grounding, new measurement point is chosen between two adjacent measurement points, and acquire the induced electric field data of new measurement point,
Including：
When having Abnormal Grounding between confirming two adjacent measurement points, the midpoint chosen between two adjacent measurement points is made
For new measurement point, and acquire the induced electric field data at midpoint.
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