CN108680780A - A kind of leakage current measurement device and method - Google Patents
A kind of leakage current measurement device and method Download PDFInfo
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- CN108680780A CN108680780A CN201810733903.9A CN201810733903A CN108680780A CN 108680780 A CN108680780 A CN 108680780A CN 201810733903 A CN201810733903 A CN 201810733903A CN 108680780 A CN108680780 A CN 108680780A
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R19/00—Arrangements for measuring currents or voltages or for indicating presence or sign thereof
- G01R19/0092—Arrangements for measuring currents or voltages or for indicating presence or sign thereof measuring current only
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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
- G01R31/12—Testing dielectric strength or breakdown voltage ; Testing or monitoring effectiveness or level of insulation, e.g. of a cable or of an apparatus, for example using partial discharge measurements; Electrostatic testing
- G01R31/1218—Testing dielectric strength or breakdown voltage ; Testing or monitoring effectiveness or level of insulation, e.g. of a cable or of an apparatus, for example using partial discharge measurements; Electrostatic testing using optical methods; using charged particle, e.g. electron, beams or X-rays
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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
- G01R31/12—Testing dielectric strength or breakdown voltage ; Testing or monitoring effectiveness or level of insulation, e.g. of a cable or of an apparatus, for example using partial discharge measurements; Electrostatic testing
- G01R31/1227—Testing dielectric strength or breakdown voltage ; Testing or monitoring effectiveness or level of insulation, e.g. of a cable or of an apparatus, for example using partial discharge measurements; Electrostatic testing of components, parts or materials
- G01R31/1245—Testing dielectric strength or breakdown voltage ; Testing or monitoring effectiveness or level of insulation, e.g. of a cable or of an apparatus, for example using partial discharge measurements; Electrostatic testing of components, parts or materials of line insulators or spacers, e.g. ceramic overhead line cap insulators; of insulators in HV bushings
Abstract
The embodiment of the invention discloses a kind of leakage current detection device and methods, are detected for the leakage current to transmission line of electricity, which is characterized in that the device includes：Optical emitting module, for exporting broadband spectral signal；Transmission module is used for the broadband spectral signal transmission to testing data acquisition module, and demodulation module will be received from the optical signal transmission that the testing data acquisition module returns to optical signal；Testing data acquisition module converts leakage current to be measured to the optical signal of specific wavelength, and by the transmission module, the optical signal transmission of the specific wavelength is received demodulation module to optical signal using the broadband spectral signal；Optical signal receives demodulation module, receives the optical signal returned from the testing data acquisition module, and by the optical signal demodulation at digital signal；Data processing module handles the digital signal, obtains real time leak current data.
Description
Technical field
The present embodiments relate to the sides that photoelectric field more particularly to a kind of leakage current to transmission line of electricity are detected
Method and device.
Background technology
With power grid commercialization deepen continuously and continuous promotion of the user to reliability of electric power and quality requirement,
Power industry is faced with unprecedented challenge and opportunity, builds controllable, safe, reliable, environmentally friendly, economic intelligent power grid system
System is just becoming the common objective of global power industry.Transmission line of electricity as flow of power, the important carrier of energy flow, transmission line of electricity
Safety becomes urgent problem to be solved.
When the accumulation of pollutants in air reaches ring to a certain degree and around insulator chain on transmission circuit insulator string
When border reaches certain condition (high humidity etc.), the resistance of insulator chain becomes smaller, and causes to occur outside insulator chain conducting and insulator chain
Electric arc, insulator chain occur flashover, electric grid large area power cut accident can occur when flashover is serious.
In order to reduce the generation of insulator chain flashover, traditional scheme is to carry out regular visit using artificial.According to previous
Flashover data, find out averagely each period that flashover may occur, periodically carry out hand sweeping insulator chain, it is this artificial fixed
Phase inspection scheme can ensure that power grid security is effectively run to a certain extent.But as electric system is constantly built,
Overhead transmission line is wide across range, and approach is with a varied topography, overhead transmission line insulator string quantity increasing drastically.In this insulator chain
Explosion type increase and insulator chain distribution it is wide under conditions of, if still using artificial regular visit clean method will consume
Take a large amount of manpower and materials, inefficiency no longer can effectively ensure power grid security.Insulator chain flashover on-line monitoring pair
Safe operation of electric network is improved to be of great significance.
Due to traditional electronic type measuring technique with electronic information processing be basis the characteristics of be doomed its will be powered,
The factors such as electromagnetic interference, signal transmission are unstable, data transmission capacity is limited restrict, and limit its safety and reliability.Cause
This, there is an urgent need for a kind of method and apparatus that can more easily the leakage current of transmission line of electricity is detected and be perceived.
Invention content
In view of this, the embodiment of the present invention provide a kind of method for being detected to the leakage current of transmission line of electricity and
Device solves the technical issues of carrying out monitoring in real time and/or early warning to the leakage current of transmission line of electricity.
In a first aspect, an embodiment of the present invention provides a kind of leakage current detection device, for the leakage to transmission line of electricity
Electric current is detected, which is characterized in that including：
Optical emitting module, for exporting broadband spectral signal；
Transmission module is used for the broadband spectral signal transmission to testing data acquisition module, and will be waited for from described
The optical signal transmission that measured data acquisition module returns to optical signal receives demodulation module；
Testing data acquisition module converts leakage current to be measured to specific wavelength using the broadband spectral signal
Optical signal, and by the transmission module, the optical signal transmission of the specific wavelength is received into demodulation module to optical signal；
Optical signal receives demodulation module, receives the optical signal that is returned from the testing data acquisition module, and by the light
Signal is demodulated to digital signal；
Data processing module handles the digital signal, obtains real time leak current data.
Optionally, the testing data acquisition module includes：
Leakage current collection submodule, for being acquired to leakage current；
Leakage current transform subblock, the optical signal for collected leakage current signal to be converted to specific wavelength.
Optionally, the leakage current collection submodule, including coil and at least one insulator chain；Wherein, it is described extremely
A few insulator chain, is serially connected in transmission line of electricity, and each insulator chain includes at least a piece of insulator；Wherein, described
The last a piece of insulator of coil and at least one insulator chain is connected in parallel.
Optionally, the leakage current transform subblock, including overarm arm, magnet and two fiber gratings, being used for will
Optical signal is converted to from the collected leakage current signal of the coil.
Optionally, the optical signal receives demodulation module, including fiber grating signal demodulation module, obtains from the optical fiber
The wavelength shift for the optical signal that grating returns；According to the mathematical model of the wavelength shift and insulator chain leakage current,
Obtain real-time insulator chain leakage current data.
Optionally, the coil is helmholtz coil pair, when leakage current passes through the helmholtz coil clock synchronization, production
Raw uniform magnetic field.
Optionally, the magnet is fixed on the side of the overarm arm, staggered relatively with the coil, is flowed through when there is electric current
The coil and when generating magnetic field, the magnet is caused the deformation or vibration of the overarm arm by the magnetic fields.
Optionally, described two fiber gratings are respectively placed in the both sides of the overarm arm, and are connected to institute by optical fiber
It states optical signal and receives demodulation module.
Optionally, when the overarm arm is deformed upon or vibrated, the output wavelength of the fiber grating will also occur partially
It moves, the wavelength shift by measuring the fiber grating obtains the leakage current data.
Optionally, the leakage current detection device further includes display module, for obtained leakage current data
It is shown.
Optionally, the leakage current detection device further includes warning device, for being reached when the leakage current values detected
When to first threshold, output alarm signal.
Second aspect, the embodiment of the present invention additionally provides a kind of leakage current detection method, for being let out to transmission line of electricity
Leakage current is detected, which is characterized in that including：
Export broadband spectral signal；
Using the broadband spectral signal, it converts leakage current to be measured to the optical signal of specific wavelength；
And by the optical signal demodulation at digital signal；
The digital signal is handled, real time leak current data is obtained.
Optionally, the optical signal for converting leakage current to be measured to specific wavelength includes：
Leakage current is acquired；
Collected leakage current signal is converted to the optical signal of specific wavelength.
Optionally, it is described to leakage current be acquired including：
At least one insulator chain is serially connected in transmission line of electricity, each insulator chain includes at least a piece of insulation
Son；
The last a piece of insulator of coil and at least one insulator chain is connected in parallel；
When leakage current is by the coil, uniform magnetic field is generated；
Magnet is fixed on to the side of the overarm arm, it is staggered relatively with the coil, flow through the coil when there is electric current
And when generating magnetic field, the magnet is caused the deformation or vibration of the overarm arm by the magnetic fields；
Two fiber gratings are respectively placed in the both sides of the overarm arm, and the optical signal is connected to by optical fiber and is connect
Receive demodulation module；
When the overarm arm is deformed upon or vibrated, the output wavelength of the fiber grating will also shift, and pass through
The wavelength shift for measuring the fiber grating obtains the leakage current data.
Optionally, the coil is helmholtz coil pair, when leakage current passes through the helmholtz coil clock synchronization, production
Raw uniform magnetic field.
Optionally, the method further includes being shown to obtained leakage current data.
Optionally, the method further includes：When the leakage current values detected reach first threshold, alarm signal is exported
Number.
Since fiber grating is not influenced by high-intensity magnetic field, and quality is small, and high sensitivity, accuracy are high.It is typically based on optical fiber light
The sensors of grid is placed on shaft tower in the wild, and the measuring device based on fiber grating can accomplish passive, need not power.It needs
The equipment of power supply is in transformer substation end.Realize entire optical fiber passive formula insulator chain leakage current not by electromagnetic interference, do not need
Power supply, and reliability is high.The scheme provided by the utility model embodiment can obtain the size of leakage current in real time,
Simple and fast convenience, it is at low cost, there is extraordinary effect.
Description of the drawings
In order to more clearly explain the embodiment of the invention or the technical proposal in the existing technology, to embodiment or will show below
There is attached drawing needed in technology description to be briefly described, it should be apparent that, the accompanying drawings in the following description is only this
Some embodiments of invention for those of ordinary skill in the art without creative efforts, can be with
Obtain other attached drawings according to these attached drawings.
Fig. 1 is the schematic diagram for the leakage current detection device that one embodiment of the invention provides；
Fig. 2 shows the signals that testing data acquisition module according to the ... of the embodiment of the present invention is acquired leakage current
Figure；
Fig. 3 shows the equivalent circuit schematic being acquired to leakage current in the embodiment of the present invention；
Fig. 4 shows a kind of flow diagram for leakage current detection method that another embodiment of the present invention provides；
Fig. 5 shows a kind of optical fiber passive formula insulator chain system for monitoring leakage current provided in an embodiment of the present invention；
Fig. 6 shows overarm arm stress change schematic diagram；
Fig. 7 shows the Distribution of Magnetic Field situation schematic diagram on hot-wire coil and its axis；
Fig. 8 shows the schematic diagram for the leakage current detection device that one embodiment of the invention provides.
Specific implementation mode
The present invention is described in further detail with reference to the accompanying drawings and examples.It is understood that this place is retouched
The specific embodiment stated is used only for explaining the present invention rather than limitation of the invention.It also should be noted that in order to just
Only the parts related to the present invention are shown in description, attached drawing rather than entire infrastructure.
It also should be noted that only the parts related to the present invention are shown for ease of description, in attached drawing rather than
Full content.It should be mentioned that some exemplary embodiments are described before exemplary embodiment is discussed in greater detail
At the processing or method described as flow chart.Although operations (or step) are described as the processing of sequence by flow chart,
It is that many of which operation can be implemented concurrently, concomitantly or simultaneously.In addition, the sequence of operations can be by again
It arranges.Processing can be terminated when its operations are completed, it is also possible to the additional step being not included in attached drawing.Processing
It can correspond to method, function, regulation, subroutine, subprogram etc..
Referenced herein " embodiment " is it is meant that a particular feature, structure, or characteristic described can wrap in conjunction with the embodiments
Containing at least one embodiment of the present invention.Each position in the description occur the phrase might not each mean it is identical
Embodiment, nor the independent or alternative embodiment with other embodiments mutual exclusion.Those skilled in the art explicitly and
Implicitly understand, embodiment described herein can be combined with other embodiments.
Fig. 1 shows a kind of schematic diagram of leakage current detection device, is examined for the leakage current to transmission line of electricity
It surveys.As shown in Figure 1, the device comprises the following modules：
Optical emitting module, for exporting broadband spectral signal to transmission module；
Wherein, which can be any light source that can send out broadband spectral signal, for example, it may be
ASE (amplified spontaneous emission) light source.
Transmission module is used for the broadband spectral signal transmission to testing data acquisition module, and will be waited for from described
The optical signal transmission that measured data acquisition module returns to optical signal receives demodulation module；
Wherein, which can be optical fiber；Optical signal reception demodulation module can be can be to optical wavelength signal solution
It is adjusted to the fiber grating signal demodulation module of digital signal.
Testing data acquisition module converts leakage current to be measured to specific wavelength using the broadband spectral signal
Optical signal, and by the transmission module, the optical signal transmission of the specific wavelength is received into demodulation module to optical signal；
Wherein, the testing data acquisition module includes：
Leakage current collection submodule, for being acquired to leakage current；
Leakage current transform subblock, the optical signal for collected leakage current signal to be converted to specific wavelength.
Wherein, which may include coil and at least one insulator chain；Wherein, it is described at least
One insulator chain, is serially connected in transmission line of electricity, and each insulator chain includes at least a piece of insulator；Wherein, the line
It encloses and is connected in parallel with the last a piece of insulator of at least one insulator chain.Wherein, which can be last of the twelve Earthly Branches nurse Hertz line
Circle pair generates uniform magnetic field when leakage current is by the helmholtz coil clock synchronization.
The leakage current transform subblock, including overarm arm, magnet and two fiber gratings, for will be from described
The collected leakage current signal of coil is converted to optical signal.The two fiber gratings are respectively placed in the two of the overarm arm
Side, and the optical signal is connected to by optical fiber and receives demodulation module.Wherein, fiber grating can be FBG.
Wherein, cantilever beam is a mechanical mechanism, and one end of cantilever beam is fixing end, and it is thick to be typically secured to a comparison
On bottom plate.The other end of cantilever beam is free end, can be caused by outer force effect cantilever beam free end bend or
Person stretches.When overarm arm deforms upon or vibrates, attaching the output wavelength of fiber grating thereon will also shift, and lead to
It crosses and measures the wavelength shift of the fiber grating and obtain the leakage current data.
In the embodiment of the present invention, cantilever beam and coil are placed on appropriate position, it is optionally, staggered relatively.The magnetic of alternation
Field action is in the magnet of cantilever beam free end.Due to the effect in magnetic field, the magnet on cantilever beam has received the effect of the power of variation,
The power of variation acts on cantilever beam so that cantilever beam up-down vibration, fiber grating the shaking also with cantilever beam on cantilever beam
Dynamic wavelength shift is also constantly changing.Insulator chain amount of leakage current to be measured is converted in this way, just having reached
Optic fiber grating wavelength offset.
Optical signal receives demodulation module, receives the optical signal that is returned from the testing data acquisition module, and by the light
Signal is demodulated to digital signal；
Wherein, optical signal receives demodulation module, may include fiber grating signal demodulation module, obtains from the optical fiber light
The wavelength shift for the optical signal that grid return；According to the mathematical model of the wavelength shift and insulator chain leakage current, obtain
Obtain real-time insulator chain leakage current data.
Optionally, fiber grating signal demodulation module is believed broadband light by the electric power special optical wire currently set up
Number by the way that on optical cable transmission to fiber grating, due to the self character of fiber grating, fiber grating goes out the light of specific wavelength.
The light of specific wavelength passes through optical cable transmission back into optical fibers grating signal demodulation module again, is filtered by photodetector and tunable FP
Wave device obtains the real-time wavelength of current return light.Fiber grating data processing distribution module is by fiber grating signal demodulation module
Obtained real-time wavelength imports the mathematical model of wavelength shift and insulator chain leakage current, and it is real-time to solve current time
Insulator chain leakage current values.
Data processing module handles the digital signal, obtains real time leak current data.
Optionally, which can also include display module, for obtained leakage current number
According to being shown.Leakage current values can be directly displayed, different degrees of leakage current can also be identified with different colors
Value.
Optionally, which can also include warning device, for when the leakage current values detected
When reaching first threshold, output alarm signal.Can sound the alarm sound, can also be sent out with particular color or lighting effect
Go out alarm signal.
In practical applications, the wavelength shift of fiber grating can be by temperature residing for fiber grating and suffered stress
Variation is influenced.In the measuring device based on fiber grating of practical application, in addition to measuring various environment using fiber grating
Temperature the case where, be typically the size of fiber grating institute stress by various thaumatropies by measured physical quantity.However
It being found in actual test, the position temperature that fiber-optic grating sensor is placed is hardly possible to be remained unchanged, which results in
Caused by not can determine that the effect that the wavelength shift of fiber grating generation is the power after having been converted by measured physical quantity,
Or caused by temperature action.
Based on this, we use two fiber gratings, the two fiber gratings are attached to the symmetrical both ends of cantilever beam, when
When cantilever beam is bent, one of fiber grating is stretched, another fiber grating is compressed.The total wavelength of whole system
Offset is the summation of two panels fiber grating and counteracts the influence of temperature on fiber grating wavelength offset, to reduce by
In the ratio that the wavelength shift that temperature generates occupies fiber grating pair is increased while improving the accuracy of measurement
The susceptibility of optic fiber grating wavelength offset under identical active force.
Since fiber grating is not influenced by high-intensity magnetic field, and quality is small, and high sensitivity, accuracy are high.It is typically based on optical fiber light
The sensors of grid is placed on shaft tower in the wild, and the measuring device based on fiber grating can accomplish passive, need not power.It needs
The equipment of power supply is in transformer substation end.Realize entire optical fiber passive formula insulator chain leakage current not by electromagnetic interference, do not need
Power supply, and reliability is high.The scheme provided through the embodiment of the present invention can obtain the size of leakage current, simply in real time
It is efficient and convenient, it is at low cost, there is extraordinary effect.
Fig. 2 shows the signals that testing data acquisition module according to the ... of the embodiment of the present invention is acquired leakage current
Figure, optical fiber passive formula insulator chain of the testing data acquisition module based on coil and cantilever beam adopt leakage current data
Collection.
An embodiment of the present invention provides one using helmholtz coil to, double optical fiber grating cantilever beam as the optical fiber of frame without
Source formula insulator chain leakage current measurement device, wherein helmholtz coil are to being core for conducting parts, fiber grating cantilever beam
Center portion part, small magnet are touchless stress development of evil in febrile disease component.By being introduced directly into the leakage current of insulator chain generation, by this
Electric current, to generating uniform magnetic field, the change of this uniform magnetic field is experienced by the small magnet on cantilever beam by helmholtz coil
Change, can be there are one the effect of power between magnetic field and small magnet, the effect drive cantilever beam of power bends, outstanding by FBG strains
Arm beam monitors the strain of cantilever beam beam surface curvature generation, and corresponding wave length shift occurs for FBG, to extrapolate at this time exhausted
The size of edge substring leakage current.
As shown in Fig. 2, first, insulator chain is connected in access high-tension line, insulator chain leakage current slave phase
Line flows into, and electric current flows through insulator chain, and before it will flow to last a piece of insulator, since the resistance value of coil is much smaller than monolithic
The resistance value of insulator, most of current direction coil, then electric current flow through shaft tower reach ground.Pass through short-circuit last a piece of insulation
Son achievees the purpose that leakage current collection.
After insulator chain leakage current flows into coil, magnetic field is generated in coil inside.Because of insulator chain leakage current
It is an exchange, i.e., also generates the magnetic field of alternation in coil inside.Then cantilever beam and coil are placed on appropriate position, alternation
Magnetic fields in the magnet of cantilever beam free end, due to the effect in magnetic field, the magnet on cantilever beam has received the power of variation
Effect, the power of variation act on cantilever beam so that cantilever beam deforms upon or up-down vibration, the fiber grating on cantilever beam
It is also constantly changing also with the vibration wavelength offset of cantilever beam.In this way, being achieved that insulator chain to be measured
Amount of leakage current is converted into optic fiber grating wavelength offset.
Fiber grating signal demodulation module is the electric power special optical wire by currently having set up, and broadband optical signal is passed through
On optical cable transmission to fiber grating, due to the self character of fiber grating, fiber grating goes out the light of specific wavelength, certain wave
Long light passes through optical cable transmission back into optical fibers grating signal demodulation module again, is obtained by photodetector and tunable FP filters
To the real-time wavelength of current return light, fiber grating data processing distribution module obtains fiber grating signal demodulation module
Real-time wavelength imports the mathematical model of wavelength shift and insulator chain leakage current, solves current time real-time insulator
String leakage current values.
Optical fiber passive formula insulator chain leakage current measurement system entirely based on coil and cantilever beam is passive, does not need volume
Outer power supply.It is drained into coil by the way of short-circuit last a piece of insulator, leakage current makes coil generate changing magnetic field work
For the magnet of cantilever beam free end, magnet is made cantilever beam vibration, cantilever beam vibration cause optical fiber light by the effect of power
The wavelength shift of grid changes, and wavelength shift data are transmitted by special optical cable into the server in substation,
And by calculating, data feedback is given to each monitoring side.By alarm mechanisms such as threshold values, early warning is carried out to insulator chain flashover.
Fig. 3 shows the equivalent circuit schematic being acquired to leakage current in the embodiment of the present invention.It can be with from Fig. 3
Know, it is R that insulator chain, which can regard multiple resistance as,InsulatorInsulator series connection made of, leakage current ILeakage currentIt is from insulation
The high potential of substring flows to zero potential.It can be obtained according to Ohm's law
U is transmission line of electricity phase voltage in formula (1), and n is the number of insulator chain insulator chain.
Leakage current measurement device is connected in parallel on to the both ends of monolithic insulator, such as by coils from parallel connection of coils and last in Fig. 2
The both ends of piece insulator.It can obtain
Wherein RIt is in parallelIt is the all-in resistance after single insulator and leakage current measurement device parallel connection, can obtains
If meeting insulator resistance is much larger than measuring device resistance, can obtain
RIt is in parallel＞ ＞ RMeasuring device (4)
Formula (3), (4) are brought into (2), and compared with (1), can be obtained
By formula (5) it is recognised that the electric current by measuring device is the multiple proportion of former leakage current.As long as exhausted in installation
When edge substring leakage current measurement device, the piece number of insulator chain is write down, you can be compensated on signal processing formula, from
And achieve the purpose that measure leakage current.
Fig. 4 shows a kind of flow diagram for leakage current detection method that another embodiment of the present invention provides, such as Fig. 4
Shown, this approach includes the following steps：
Export broadband spectral signal；
Wherein it is possible to broadband spectral signal be exported by any light source that can send out broadband spectral signal, for example, can
To send out broadband spectral signal by ASE (amplified spontaneous emission) light sources.
Using the broadband spectral signal, it converts leakage current to be measured to the optical signal of specific wavelength；
Wherein, the optical signal for converting leakage current to be measured to specific wavelength may include：Leakage current is acquired；
Collected leakage current signal is converted to the optical signal of specific wavelength.
Optionally, it is described to leakage current be acquired including：
At least one insulator chain is serially connected in transmission line of electricity, each insulator chain includes at least a piece of insulation
Son；
The last a piece of insulator of coil and at least one insulator chain is connected in parallel；
When leakage current is by the coil, uniform magnetic field is generated；
Magnet is fixed on to the side of the overarm arm, it is staggered relatively with the coil, flow through the coil when there is electric current
And when generating magnetic field, the magnet is caused the deformation or vibration of the overarm arm by the magnetic fields；
Two fiber gratings are respectively placed in the both sides of the overarm arm, and the optical signal is connected to by optical fiber and is connect
Receive demodulation module；
Wherein, cantilever beam is a mechanical mechanism, and one end of cantilever beam is fixing end, and it is thick to be typically secured to a comparison
On bottom plate.The other end of cantilever beam is free end, can be caused by outer force effect cantilever beam free end bend or
Person stretches.When overarm arm deforms upon or vibrates, the output wavelength of fiber grating will also shift, by measuring the light
The wavelength shift of fine grating obtains the leakage current data.
In the embodiment of the present invention, cantilever beam and coil are placed on appropriate position.The magnetic fields of alternation in cantilever beam from
By the magnet held.Due to the effect in magnetic field, the magnet on cantilever beam has received the effect of the power of variation, and the power of variation acts on outstanding
On arm beam so that cantilever beam up-down vibration, the fiber grating on cantilever beam also exist also with the vibration wavelength offset of cantilever beam
Constantly change.It converts insulator chain amount of leakage current to be measured to optic fiber grating wavelength offset in this way, just having reached
Amount.
When the overarm arm is deformed upon or vibrated, the output wavelength of the fiber grating will also shift, and pass through
The wavelength shift for measuring the fiber grating obtains the leakage current data.
Optionally, the coil is helmholtz coil pair, when leakage current passes through the helmholtz coil clock synchronization, production
Raw uniform magnetic field.
By the optical signal demodulation at digital signal；
Wherein it is possible to by fiber grating signal demodulation module, the wave of the optical signal returned from the fiber grating is obtained
Long offset；According to the mathematical model of the wavelength shift and insulator chain leakage current, obtains real-time insulator chain and let out
Leakage data.
Optionally, fiber grating signal demodulation module is believed broadband light by the electric power special optical wire currently set up
Number by the way that on optical cable transmission to fiber grating, due to the self character of fiber grating, fiber grating goes out the light of specific wavelength.
The light of specific wavelength passes through optical cable transmission back into optical fibers grating signal demodulation module again, is filtered by photodetector and tunable FP
Wave device obtains the real-time wavelength of current return light.Fiber grating data processing distribution module is by fiber grating signal demodulation module
Obtained real-time wavelength imports the mathematical model of wavelength shift and insulator chain leakage current, and it is real-time to solve current time
Insulator chain leakage current values.
The digital signal is handled, real time leak current data is obtained.
Optionally, which can also include being shown to obtained leakage current data.It can
To directly display leakage current values, with different colors different degrees of leakage current values can also be identified.
Optionally, which can also include when the leakage current values detected reach first threshold
When, output alarm signal.Can sound the alarm sound, can also carry out signal an alert with particular color or lighting effect.
In practical applications, the wavelength shift of fiber grating can be by temperature residing for fiber grating and suffered stress
Variation is influenced.In the measuring device based on fiber grating of practical application, in addition to measuring various environment using fiber grating
Temperature the case where, be typically the size of fiber grating institute stress by various thaumatropies by measured physical quantity.However
It being found in actual test, the position temperature that fiber-optic grating sensor is placed is hardly possible to be remained unchanged, which results in
Caused by not can determine that the effect that the wavelength shift of fiber grating generation is the power after having been converted by measured physical quantity,
Or caused by temperature action.
Based on this, we use two fiber gratings, the two fiber gratings are attached to the symmetrical both ends of cantilever beam, when
When cantilever beam is bent, one of fiber grating is stretched, another fiber grating is compressed.The total wavelength of whole system
Offset is the summation of two panels fiber grating and counteracts the influence of temperature on fiber grating wavelength offset, to reduce by
In the ratio that the wavelength shift that temperature generates occupies fiber grating pair is increased while improving the accuracy of measurement
The susceptibility of optic fiber grating wavelength offset under identical active force.
Since fiber grating is not influenced by high-intensity magnetic field, and quality is small, and high sensitivity, accuracy are high.It is typically based on optical fiber light
The sensors of grid is placed on shaft tower in the wild, and the measuring device based on fiber grating can accomplish passive, need not power.It needs
The equipment of power supply is in transformer substation end.Realize entire optical fiber passive formula insulator chain leakage current not by electromagnetic interference, do not need
Power supply, and reliability is high.The scheme provided through the embodiment of the present invention can obtain the size of leakage current, simply in real time
It is efficient and convenient, it is at low cost, there is extraordinary effect.
Fig. 5 shows a kind of optical fiber passive formula insulator chain system for monitoring leakage current provided in an embodiment of the present invention.By
Fig. 5 can be seen that on the electric power line pole tower installed optical fiber passive formula insulator chain leakage current measurement device in the wild, so
The fiber grating optical signal in optical fiber passive formula insulator chain leakage current measurement device is transmitted by special optical cable afterwards,
It transmits into the FBG information (FBG) demodulators in substation's computer room, the centre wavelength signal of fiber grating at this time is demodulated to come, then
During this partial data is uploaded onto the server.According to the mathematical model established in server, fiber bragg grating center wavelength is utilized
Information calculates the insulator chain leakage current on shaft tower at this time, is then stored, is distributed to each user terminal, and
When insulator chain leakage current is more than some threshold value, the page carries out corresponding early warning.
Fig. 6 shows overarm arm stress change schematic diagram.Cantilever beam is a mechanical mechanism, and one end of cantilever beam is fixed
End, is typically secured on a thick bottom plate of comparison.The other end of cantilever beam is free end, can be led by outer force effect
Cantilever beam free end is caused to bend or stretch.In structural mechanics, usually cantilever beam structure is carried out to simplify processing.Cantilever
The model of beam is as shown in Figure 6.
The length of cantilever beam, width, thickness are respectively L, W, H, and after free end is by a directed force F, cantilever beam is certainly
It is bent by end, the amount of deflection of relative displacement, that is, free end of free end movement is ω.Distance on cantilever beam is can be obtained to fix
The arbitrary point equation that end distance is x
M (x)=F (L-x) (7)
M is the moment of flexure of cantilever beam.When cantilever beam is the slender beam in elastic range, the differential equation can be obtained
In formula (8), E, I are respectively the moment of inertia of the Young's modulus and cantilever beam section of the material used in cantilever beam.By formula
(8) bringing into after (7) integrate afterwards can obtain
By boundary condition x=0, ω=0,Substitution formula (9), formula (10) can obtain
Therefore the equation for the free end amount of deflection that can obtain cantilever beam is
The direct stress σ of arbitrary point is on cantilever beam cross section
In formula (14), z is the distance between tested point on cantilever beam to cantilever beam central axes.For general in Fig. 6
For rectangular cantilever beam
Again according to strain definition
σ=E ε (17)
Simultaneous formula (7), formula (15), formula (16), formula (17) can obtain the strain at any point on cantilever beam and be
Fig. 7 shows the Distribution of Magnetic Field situation schematic diagram on hot-wire coil and its axis.Coil is one and is usually used in measuring
One device of electric current will usually compare the electric current for being difficult to measure and be converted into magnetic field produced by coil.When coil passes through electric current.
The distribution situation in magnetic field is as shown in Figure 7 by the coil center of circle and on the axis vertical with coil plane.
According to Biot-Savart law, certain magnetic induction density B put is on axis
I is the size by the current value on coil in formula (19), and N is the total number of turns of coil, and R is the radius of coil, and x is
Centre point is to the distance of central axes point, μ0For space permeability.It is apparent from, in the magnetic induction density B of coil circle centre position0For
By formula (20) it is found that the radius of the size of hot-wire coil external magnetic field and coil, the number of turns of coil and current related,
It must be fully considered when selecting coil.
In an optional embodiment of the embodiment of the present invention, device further includes：
It is schematical, only a kind of division of logic function to the division of module in the above embodiment of the present invention, it is practical
There may be another division manner when realization, in addition, each function module in each embodiment of the application can be integrated in one
Can also be to physically exist alone in a processor, can also two or more modules be integrated in a module.It is above-mentioned
The form that hardware had both may be used in integrated module is realized, can also be realized in the form of software function module.
The electronic equipment of the embodiment of the present invention exists in a variety of forms, including but not limited to:
(1) mobile communication equipment:The characteristics of this kind of equipment is that have mobile communication function, and to provide speech, data
Communication is main target.This Terminal Type includes:Smart mobile phone (such as iPhone), multimedia handset, functional mobile phone and low
Hold mobile phone etc..
(2) super mobile personal computer equipment:This kind of equipment belongs to the scope of personal computer, there is calculating and processing work(
Can, generally also have mobile Internet access characteristic.This Terminal Type includes:PDA, MID and UMPC equipment etc., such as iPad.
(3) portable entertainment device:This kind of equipment can show and play multimedia content.Such equipment includes:Sound
Frequently, video player (such as iPod), handheld device, e-book and intelligent toy and portable car-mounted navigation equipment.
(4) server:The equipment for providing the service of calculating, the composition of server include processor 1010, hard disk, memory, are
Bus of uniting etc., server is similar with general computer architecture, but due to needing to provide highly reliable service, is handling
Ability, stability, reliability, safety, scalability, manageability etc. are more demanding.
(5) other electronic devices with data interaction function.
The apparatus embodiments described above are merely exemplary, wherein can be as the module that separating component illustrates
Or may not be and be physically separated, the component shown as module may or may not be physical module, i.e.,
A place can be located at, or may be distributed on multiple network modules.It can select according to the actual needs therein
Some or all of module achieves the purpose of the solution of this embodiment.Those of ordinary skill in the art are not paying creative labor
In the case of dynamic, you can to understand and implement.
The embodiment of the present invention provides a kind of non-volatile computer readable storage medium storing program for executing, non-volatile computer readable storage
Media storage has program instruction, when electronic equipment executes program instructions, for execute the method in above method embodiment and
Step.
An embodiment of the present invention provides a kind of computer program products, wherein computer program product is non-including being stored in
Computer program in transitory computer readable storage medium, computer program include program instruction, wherein when program instruction quilt
When electronic equipment executes, electronic equipment is made to execute the method in above-mentioned any means embodiment.
Each function module in each embodiment of the present invention can be integrated in a processing unit, can also be each
Module physically exists alone, can also be during two or more modules are integrated in one unit.Above-mentioned integrated unit both may be used
It realizes, can also be realized in the form of hardware adds SFU software functional unit in the form of using hardware.
The above-mentioned integrated unit being realized in the form of SFU software functional unit can be stored in one and computer-readable deposit
In storage media.Above-mentioned SFU software functional unit is stored in a storage medium, including some instructions are used so that a computer
Device (can be personal computer, server or network equipment etc.) or intelligent terminal or processor (Processor)
Execute the part steps of each embodiment method of the present invention.And storage medium above-mentioned includes：USB flash disk, mobile hard disk, read-only storage
Device (Read-Only Memory, ROM), random access memory (Random Access Memory, RAM), magnetic disc or light
The various media that can store program code such as disk.
In above-described embodiment provided by the present invention, it should be understood that disclosed device and method can pass through it
Its mode is realized.For example, the apparatus embodiments described above are merely exemplary, for example, the division of module, only
A kind of division of logic function, formula that in actual implementation, there may be another division manner, for example, multiple module or components can combine or
Person is desirably integrated into another system, or some features can be ignored or not executed.
The module illustrated as separating component may or may not be physically separated, and be shown as module
Component may or may not be physical module, you can be located at a place, or may be distributed over multiple networks
On unit.Some or all of module therein can be selected according to the actual needs to achieve the purpose of the solution of this embodiment.
It these are only the embodiment of the present invention, the scope of the claims of the present invention be not intended to limit, although with reference to the foregoing embodiments
Invention is explained in detail, still can be to aforementioned each specific reality for those skilled in the art comes
It applies the technical solution recorded in mode to modify, or equivalence replacement is carried out to which part technical characteristic.It is every to utilize this
The equivalent structure that description of the invention and accompanying drawing content are done directly or indirectly is used in other related technical areas, similarly
Within scope of patent protection of the present invention.
Claims (17)
1. a kind of leakage current detection device, is detected for the leakage current to transmission line of electricity, which is characterized in that including：
Optical emitting module, for exporting broadband spectral signal；
Transmission module is used for the broadband spectral signal transmission to testing data acquisition module, and will be from the number to be measured
The optical signal transmission returned according to acquisition module to optical signal receives demodulation module；
Testing data acquisition module, using the broadband spectral signal, the light for converting leakage current to be measured to specific wavelength is believed
Number, and by the transmission module, the optical signal transmission of the specific wavelength is received into demodulation module to optical signal；
Optical signal receives demodulation module, receives the optical signal that is returned from the testing data acquisition module, and by the optical signal
It is demodulated to digital signal；
Data processing module handles the digital signal, obtains real time leak current data.
2. leakage current detection device according to claim 1, wherein the testing data acquisition module includes：
Leakage current collection submodule, for being acquired to leakage current；
Leakage current transform subblock, the optical signal for collected leakage current signal to be converted to specific wavelength.
3. leakage current detection device according to claim 2, wherein
The leakage current collection submodule, including coil and at least one insulator chain；Wherein, at least one insulator
String, is serially connected in the transmission line of electricity, and each insulator chain includes at least a piece of insulator；Wherein, the coil with
The last a piece of insulator of at least one insulator chain is connected in parallel.
4. leakage current detection device according to claim 3, wherein
The leakage current transform subblock, including overarm arm, magnet and two fiber gratings, being used for will be from the coil
Collected leakage current signal is converted to optical signal.
5. leakage current detection device according to claim 4, wherein
The optical signal receives demodulation module, including fiber grating signal demodulation module, what acquisition was returned from the fiber grating
The wavelength shift of optical signal；According to the mathematical model of the wavelength shift and insulator chain leakage current, obtain real-time
Insulator chain leakage current data.
6. according to claim 3-5 any one of them leakage current detection devices, wherein the coil is helmholtz coil
It is right, when leakage current is by the helmholtz coil clock synchronization, generate uniform magnetic field.
7. leakage current detection device according to claim 4, wherein the magnet is fixed on the one of the overarm arm
Side, staggered relatively with the coil, when having electric current to flow through the coil and generating magnetic field, the magnet is made by the magnetic field
With causing the deformation or vibration of the overarm arm.
8. leakage current detection device according to claim 7, wherein described two fiber gratings are respectively placed in described
The symmetrical both sides of overarm arm, and the optical signal is connected to by optical fiber and receives demodulation module.
9. leakage current detection device according to claim 8, wherein when the overarm arm is deformed upon or is vibrated,
The output wavelength of the fiber grating will also shift, and the wavelength shift by measuring the fiber grating obtains described let out
Leakage data.
10. leakage current detection device according to claim 1, wherein the leakage current detection device further includes：
Display module, for being shown to obtained leakage current data.
11. leakage current detection device according to claim 1, wherein the leakage current detection device further includes：
Warning device, for when the leakage current values detected reach first threshold, output alarm signal.
12. a kind of leakage current detection method, is detected for the leakage current to transmission line of electricity, which is characterized in that including：
Export broadband spectral signal；
Using the broadband spectral signal, it converts leakage current to be measured to the optical signal of specific wavelength；
And by the optical signal demodulation at digital signal；
The digital signal is handled, real time leak current data is obtained.
13. leakage current detection method according to claim 12, wherein it is described convert leakage current to be measured to it is specific
The optical signal of wavelength includes：
Leakage current is acquired；
Collected leakage current signal is converted to the optical signal of specific wavelength.
14. leakage current detection method according to claim 13, wherein it is described to leakage current be acquired including：
At least one insulator chain is serially connected in transmission line of electricity, each insulator chain includes at least a piece of insulator；
The last a piece of insulator of coil and at least one insulator chain is connected in parallel；
When leakage current is by the coil, uniform magnetic field is generated；
Magnet is fixed on to the side of the overarm arm, it is staggered relatively with the coil, when thering is electric current to flow through the coil and produce
When magnetisation field, the magnet is caused the deformation or vibration of the overarm arm by the magnetic fields；
Two fiber gratings are respectively placed in the symmetrical both sides of the overarm arm, and the optical signal is connected to by optical fiber
Receive demodulation module；
When the overarm arm is deformed upon or vibrated, the output wavelength of the fiber grating will also shift, and pass through measurement
The wavelength shift of the fiber grating obtains the leakage current data.
15. leakage current detection method according to claim 14, wherein the coil is helmholtz coil pair.
16. leakage current detection method according to claim 12, wherein the method further includes：
Obtained leakage current data is shown.
17. leakage current detection method according to claim 12, wherein the method further includes：
When the leakage current values detected reach first threshold, output alarm signal.
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| CN201810733903.9A CN108680780A (en) | 2018-07-06 | 2018-07-06 | A kind of leakage current measurement device and method |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110058176A (en) * | 2019-04-30 | 2019-07-26 | 华霆（合肥）动力技术有限公司 | Current measuring method, apparatus and system |
| CN111123157A (en) * | 2020-01-23 | 2020-05-08 | 国网江苏省电力有限公司无锡供电分公司 | Device and method for detecting leakage current of power transmission line |
| CN116973697A (en) * | 2023-06-20 | 2023-10-31 | 无锡广盈集团有限公司 | Leakage current identification system and method |
-
2018
- 2018-07-06 CN CN201810733903.9A patent/CN108680780A/en active Pending
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110058176A (en) * | 2019-04-30 | 2019-07-26 | 华霆（合肥）动力技术有限公司 | Current measuring method, apparatus and system |
| CN110058176B (en) * | 2019-04-30 | 2021-04-06 | 华霆（合肥）动力技术有限公司 | Current measuring method, device and system |
| CN111123157A (en) * | 2020-01-23 | 2020-05-08 | 国网江苏省电力有限公司无锡供电分公司 | Device and method for detecting leakage current of power transmission line |
| CN116973697A (en) * | 2023-06-20 | 2023-10-31 | 无锡广盈集团有限公司 | Leakage current identification system and method |
| CN116973697B (en) * | 2023-06-20 | 2024-03-26 | 无锡广盈集团有限公司 | Leakage current identification system and method |
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