CN108414798A - A kind of current sensor, monitoring system and monitoring method - Google Patents
A kind of current sensor, monitoring system and monitoring method Download PDFInfo
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- CN108414798A CN108414798A CN201810189204.2A CN201810189204A CN108414798A CN 108414798 A CN108414798 A CN 108414798A CN 201810189204 A CN201810189204 A CN 201810189204A CN 108414798 A CN108414798 A CN 108414798A
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- rogowski coil
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R1/00—Details of instruments or arrangements of the types included in groups G01R5/00 - G01R13/00 and G01R31/00
- G01R1/02—General constructional details
- G01R1/04—Housings; Supporting members; Arrangements of terminals
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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
Abstract
This application discloses a kind of current sensors, including insulation board, the first Rogowski coil and the second Rogowski coil.First Rogowski coil is fixed on the one side of insulation board, and the second Rogowski coil is fixed on the another side of insulation board.The number of turns of first Rogowski coil is less than the number of turns of the second Rogowski coil.Current sensor can to circuit under power frequency the low current range and signal of high current range measures in high frequency.The case where to avoid since there are iron cores when being measured using traditional ferromagnetic formula current transformer, containing DC component in primary current is easily saturated, and tested current range becomes smaller, and frequency band is narrow, and pickoff signals are easy distortion.During measurement amplitude prodigious fault current, is not in magnetic saturation phenomenon, there is excellent linear characteristic, be suitably applied to the higher occasion of current measurement required precision.Present invention also provides the monitoring systems comprising above-mentioned current sensor, and complete the monitoring method of monitoring process.
Description
Technical field
This application involves a kind of technical field of electromagnetic measurement more particularly to current sensor, monitoring system and monitoring methods.
Background technology
Current sensor has been more and more widely used in the power system.It is filled in DC transmission system, frequency control
It sets, inverter, ups power, inverter type welder, substation, be electrolysed plating, numerically-controlled machine tool, microcomputer detecting system, power network monitoring system
It unites and needs in each actual scene of isolation detection electric current, non-sinusoidal current is detected using current sensor, to judge electric power
Whether circuit and equipment are in normal operating condition.The information that current sensor will detect is converted to symbol according to certain rule
The signal output for closing electric signal or other required forms that certain standard needs, to meet the transmission, processing, storage of information
The requirements such as deposit, show, record and control.
Current sensor is broadly divided into two classes according to operation principle：One kind is according to tested electric current on known resistance
Voltage drop determines the measuring device of tested size of current, such as current divider；Another kind of is the magnetic field established according to electric current is tested
Determine the measuring device of tested size of current, as Magnetic Sensor, such as ferromagnetic formula current transformer.It is examined using current divider
When not being isolated between the exactly input of the greatest problem of survey and output, also, high frequency or high current are measured with current divider, it can not keep away
Carry inductive with exempting from.Therefore, after accessing current divider in power circuit, the waveform of tested electric current is influenced whether, and cannot
It is true to transmit current signal.
The dielectric strength of ferromagnetic formula current transformer is high, performance is stablized, and power consumption is smaller, can bear larger load,
Circuit-under-test can not be turned off when installation.But since ferromagnetic formula current transformer uses core material, not there is ideal magnetic
Change characteristic, contains DC component in primary current and be easily saturated, so that tested current range becomes smaller, frequency band is narrow,
Pickoff signals are easy distortion, are not suitable for being applied to the higher occasion of current measurement required precision.For example, adding for detected amplitude
When big transient current or high di/dt electric currents, ferromagnetic formula current transformer, which undistorted cannot reflect, is tested electric current, measures and misses
Difference is larger.
Invention content
A kind of current sensor of the application offer, monitoring system and monitoring method detect electric current to solve current sensor
Range is small, and frequency band is narrow, pickoff signals are distorted, and leads to the problem that measurement error is big.
A kind of current sensor, the current sensor include insulation board, the first Rogowski coil and second
Rogowski coil；
The center of the insulation board is equipped with through-hole；
The axis of the through-hole is equipped with conducting wire；
First Rogowski coil is fixed on the one side of the insulation board；
Second Rogowski coil is fixed on the another side of the insulation board；
The number of turns of first Rogowski coil is less than the number of turns of second Rogowski coil；
It is identical that the axis of first Rogowski coil and second Rogowski coil is equipped with structure snd size
Skeleton；
One end of first Rogowski coil and second Rogowski coil is equipped with first coil end；
The other end of first Rogowski coil and second Rogowski coil is equipped with the second coil end；
The first coil end is equipped with the first signal lead；
First signal lead is connect with the first coil end；
Second coil end is equipped with second signal lead；
The second signal lead is connect with second coil end.
Further, the skeleton is made of 4 round bars；
4 round bars head and the tail are surround by first Rogowski coil and second Rogowski coil to connect
Form square structure.
Further, the insulation board includes the first semi-ring, the second semi-ring, the first coupling head and the second coupling head；
One end of first semi-ring is connected by first coupling head with one end of second semi-ring；
The other end of first semi-ring is connected by second coupling head with the other end of second semi-ring.
Further, first coupling head and second coupling head are plug-in type coupling head；
The both ends of first coupling head and second coupling head are elastic bayonet lock shape.
Further, the first Rogoswki coils and second Rogowski coil are all made of enameled wire and uniformly twine
Coiled；
The outside of first Rogowski coil and second Rogowski coil by conductive metal strip uniformly around
Shielded layer processed；
The outside of the shielded layer is equipped with insulating protective layer.
Further, the insulation board is epoxy resin board.
A kind of monitoring system, the monitoring system include the current sensor, on the spot module, remote end module and optical fiber；
The current sensor is electrically connected with the module on the spot；
The module on the spot is connect by the optical fiber with the remote end module；
The module on the spot includes data acquisition unit and electro-optical signal converting unit；
The current sensor is electrically connected by the data acquisition unit with the electro-optical signal converting unit；
The data acquisition unit is connect by the electro-optical signal converting unit with the optical fiber；
The remote end module includes photoelectric signal transformation unit and data processing and analysis unit；
The optical fiber is electrically connected by the photoelectric signal transformation unit with the Data Management Analysis unit.
Further, monitoring system further includes non-metal shell；
The current sensor, the module on the spot, the remote end module and the optical fiber are encapsulated in the non-metal case
Internal portion.
A kind of monitoring method is applied to the monitoring system, includes the following steps：
Step S1：The current sensor measurement data；
Step S2：The signal of current sensor output, is transported to that described module, the data acquisition unit are adopted on the spot
Collect analog signals；
Step S3：Collected analog signals are input to the electro-optical signal converting unit, and analog signals are changed
For digital signal；
Step S4：Digital signal is transferred to the remote end module by the optical fiber, and digital signal inputs the optical telecommunications
Number converting unit, is changed into analog signals again by digital signal；
Step S5：Analog signals are transmitted to the processing that the Data Management Analysis unit carries out data.
The advantageous effect of the application is：
By above technical scheme it is found that this application provides a kind of current sensor, the current sensor includes insulation
Plate, the first Rogowski coil and the second Rogowski coil.First Rogowski coil is fixed on the insulation board
On one side, second Rogowski coil is fixed on the another side of the insulation board.The number of turns of first Rogowski coil
Less than the number of turns of second Rogowski coil.Current sensor can to circuit under power frequency low current range and in high frequency
The signal of high current range measures.To be avoided using the current sensor of the application and utilize traditional ferromagnetic formula electricity
Since there are iron cores when current transformer measures, containing DC component in primary current is easily saturated, and is tested electric current
Range becomes smaller, and frequency band is narrow, and pickoff signals are easy distortion.Be not in that magnetic is full during measurement amplitude prodigious fault current
And phenomenon, there is excellent linear characteristic, be suitably applied to the higher occasion of current measurement required precision.The application also provides
Include the monitoring system of above-mentioned current sensor, and completes the monitoring method of monitoring process.
Description of the drawings
In order to illustrate more clearly of the technical solution of the application, letter will be made to attached drawing needed in the embodiment below
Singly introduce, it should be apparent that, for those of ordinary skills, without having to pay creative labor,
Other drawings may also be obtained based on these drawings.
Fig. 1 is a kind of structural schematic diagram of current sensor of the embodiment of the present application；
Fig. 2 is a kind of end structure illustration of current sensor of the embodiment of the present application；
Fig. 3 is that structural schematic diagram cuts open in the office of Fig. 2；
Fig. 4 is a kind of current sensor output analysis structure model of the embodiment of the present application；
Fig. 5 is a kind of current sensor output analysis structure model enlarged drawing of the embodiment of the present application；
Fig. 6 is a kind of current sensor coil hop count simulation analysis figure of the embodiment of the present application；
Fig. 7 is a kind of structural schematic diagram of monitoring system of the embodiment of the present application；
Fig. 8 is a kind of flow diagram of monitoring method of the embodiment of the present application.
Wherein, 1- current sensors, 2- insulation boards, the first Rogowski coils of 3-, the second Rogowski coils of 4-, 5- are logical
Hole, 6- conducting wires, 7- skeletons, 8- first coils end, the second coil ends of 9-, the first signal leads of 10-, 11- second signals are drawn
Line, 12- round bars, the first semi-rings of 13-, the second semi-rings of 14-, the first coupling heads of 15-, the second coupling heads of 16-, 17- shielded layers, 18-
Insulating protective layer, module, 20- remote end modules, 21- optical fiber, 22- data acquisition units, the conversion of 23- electro-optical signals are single on the spot by 19-
Member, 24- photoelectric signal transformation units, 25- Data Management Analysis units, 26- non-metal shells.
Specific implementation mode
Here embodiment will be illustrated in detail, the example is illustrated in the accompanying drawings.In the following description when referring to the accompanying drawings,
Unless otherwise indicated, the same numbers in different drawings indicate the same or similar elements.Implementation described in following embodiment
Mode does not represent all embodiments consistent with the application.
Current sensor is broadly divided into two classes according to operation principle：One kind is according to tested electric current on known resistance
Voltage drop determines the measuring device of tested size of current, such as current divider；Another kind of is the magnetic field established according to electric current is tested
Determine the measuring device of tested size of current, as Magnetic Sensor, such as ferromagnetic formula current transformer.It is examined using current divider
When not being isolated between the exactly input of the greatest problem of survey and output, also, high frequency or high current are measured with current divider, it can not keep away
Carry inductive with exempting from.Therefore, after accessing current divider in power circuit, the waveform of tested electric current is influenced whether, and cannot
It is true to transmit current signal.The dielectric strength of ferromagnetic formula current transformer is high, performance is stablized, and power consumption is smaller, can bear compared with
Big load, when installation, can not turn off circuit-under-test.But since ferromagnetic formula current transformer uses core material, not have
There is ideal magnetization characteristic, containing DC component in primary current is easily saturated, so that tested current range becomes
Small, frequency band is narrow, and pickoff signals are easy distortion, is not suitable for being applied to the higher occasion of current measurement required precision.For example, for
When the transient current of detected amplitude increasing or high di/dt electric currents, ferromagnetic formula current transformer undistorted cannot reflect tested
Electric current, measurement error are larger.
The application provides a kind of current sensor, and the current sensor 1 includes insulation board 2, the first Rogowski coil 3
With the second Rogowski coil 4；
The center of the insulation board 2 is equipped with through-hole 5；
The axis of the through-hole 5 is equipped with conducting wire 6；
First Rogowski coil 3 is fixed on the one side of the insulation board 2；
Second Rogowski coil 4 is fixed on the another side of the insulation board 2；
The number of turns of first Rogowski coil 3 is less than the number of turns of second Rogowski coil 4；
The axis of first Rogowski coil 3 and second Rogowski coil 4 is equipped with structure snd size phase
Same skeleton 7；
One end of first Rogowski coil 3 and second Rogowski coil 4 is equipped with first coil end
8；
The other end of first Rogowski coil 3 and second Rogowski coil 4 is equipped with the second coil-end
First 9；
The first coil end 8 is equipped with the first signal lead 10；
First signal lead 10 is connect with the first coil end 8；
Second coil end 9 is equipped with second signal lead 11；
The second signal lead 11 is connect with second coil end 9.
Specifically, it is a kind of structural schematic diagram of current sensor of the embodiment of the present application referring to Fig. 1, Fig. 2 is that the application is real
Apply a kind of end structure illustration of current sensor of example；
First Rogowski coil 3 is equably wound on the skeleton 7 of 3 axis of the first Rogowski coil using enameled wire
On.Second Rogowski coil 4 is equably wound on using enameled wire on the skeleton 7 of 4 axis of the second Rogowski coil.Skeleton
7, which can be used the non-magnetic materials such as plastics, ceramics, is made, and relative permeability is identical as the relative permeability of air.Due to first
The magnetic circuit of Rogowski coil 3 and the second Rogowski coil 4 is free of iron core, therefore without saturation problem.By the first Rogowski
Coil 3 is fixed on the one side of the insulation board 2, and second Rogowski coil 4 is fixed on the another side of the insulation board 2.
It is a kind of output of current sensor 1 analysis structure model of the embodiment of the present application referring to Fig. 4, Fig. 5 is implemented for the application
A kind of output of current sensor 1 analysis structure model enlarged drawing of example.1 Output Signal Analysis process of specific current sensor is as follows.
Since the first Rogowski coil 3 is identical with 4 structure of the second Rogowski coil, only the number of turns is different, so only
A model need to be established.
In Fig. 5, kth the number of turns coil inner edge magnetic induction intensity is：
Outside magnetic induction intensity is：
Wherein, BknFor kth the number of turns coil inner edge magnetic induction intensity, BkmFor magnetic induction intensity outside kth the number of turns coil, μrμ0
For environment magnetic conductivity, i (t) is alternating current at hub of a spool O points, HknFor kth the number of turns coil inner edge magnetic field intensity, HkmFor kth
Magnetic field intensity outside the number of turns coil, l are distance of the hub of a spool O points apart from coil inner edge, and d is coil diameter, dkFor kth the number of turns
Vertical range of the section away from section where hub of a spool O points where coil.
If l>8d, then Bkn/Bkm<1.008, it is equal everywhere to be approximately considered coil section magnetic field.
Magnetic induction intensity perpendicular to kth the number of turns coil section direction is：
Wherein, Bk' it is perpendicular to kth the number of turns coil section direction magnetic induction intensity, lkIt is hub of a spool O away from coil section
The distance at center.
Magnetic flux perpendicular to kth the number of turns coil section direction is：
Wherein, φkFor perpendicular to the magnetic flux in kth the number of turns coil section direction, S is kth the number of turns sectional area.
Wherein,
Magnetic linkage：
Voltage output：
Wherein, N ' represents coil turn.
Citing is calculated, if a rated current, i.e. hub of a spool current in wire are 100A, d=5mm, l=
21mm, the circles of the number of turns N '=400 of the first Rogowski coil 3, the circles of the number of turns N '=2000 of the second Rogowski coil 4, at this time
The output u of two coilsoutRespectively 5.04mv and 25.24mv.
Due to the first Rogowski coil 3 the number of turns be less than the second Rogowski coil 4 the number of turns, first
Rogowski coil 3 for realizing larger current measurement, the second Rogowski coil 4 for realizing weak current measurement.
When circuit is under power frequency, electric current is detected using the first Rogowski coil 3；When circuit is in the malfunction of high frequency
When, electric current is detected using the second Rogowski coil 4.It detects obtained data and passes through the first signal lead 10 and second
Signal lead 11 is transmitted.As a result, to circuit under power frequency low current range and in high frequency the signal of high current range into
Row detection.It can measure milliampere grade within the scope of low current, high current range can measure hundred peace grade electric currents.To using the application's
Current sensor 1 is avoided when being measured using traditional ferromagnetic formula current transformer since there are iron cores, in primary current
Containing being easily saturated in the case of DC component, tested current range becomes smaller, and frequency band is narrow, and pickoff signals are easy distortion.Pass through design
Structure is identical and the first Rogowski coil 3 and the second Rogowski coil 4 that the number of turns is different, to circuit under power frequency low current
The range and signal of high current range can measure in high frequency.During measurement amplitude prodigious fault current, no
It will appear magnetic saturation phenomenon, there is excellent linear characteristic, be suitably applied to the higher occasion of current measurement required precision.
By above technical scheme it is found that this application provides a kind of current sensor, the current sensor 1 includes insulation
Plate 2, the first Rogowski coil 3 and the second Rogowski coil 4.First Rogowski coil 3 is fixed on the insulation
The one side of plate 2, second Rogowski coil 4 are fixed on the another side of the insulation board 2.First Rogowski coil
3 the number of turns is less than the number of turns of second Rogowski coil 4.Current sensor can to circuit under power frequency low current range and
The signal of high current range measures in high frequency.To be avoided using traditional using the current sensor 1 of the application
Since there are iron cores when ferromagnetic formula current transformer measures, containing DC component in primary current is easily saturated,
Tested current range becomes smaller, and frequency band is narrow, and pickoff signals are easy distortion.It, will not during measurement amplitude prodigious fault current
There is magnetic saturation phenomenon, there is excellent linear characteristic, be suitably applied to the higher occasion of current measurement required precision.
Further, the skeleton 7 is made of 4 round bars 12；
4 round bars, 12 head and the tail are surround by first Rogowski coil 3 and second Rogowski coil 4
Connect to forming square structure.
Specifically, it is a kind of current sensor coil quantity simulation analysis figure of the embodiment of the present application referring to Fig. 6.Wherein N
The hop count that coil is divided into is represented, d represents coil diameter.It is in current sensor coil quantity respectively using MATLAB softwares
1, it is emulated in the case of 2,3,4,8, obtains percentage error and distance, i.e. relational graph between coil diameter d.To
Influence to hop count N to circuit measurement accuracy.From fig. 6, it can be seen that hop count N is different, the percentage of circuit measurement
Ratio error is different.When the current sensor 1 for being uniformly placed on 6 surrounding of tested conducting wire composition using 4 sections of coils, i.e. current sensor
When the angle of middle adjacent segment coil is 90 degree, the percentage within the scope of coil diameter d shown in Fig. 6 measured by current sensor 1
Ratio error is respectively less than 0.2%, meets the requirement of measurement accuracy.When hop count N is less than 4, the angle of adjacent windings is less than 90 degree,
The percentage error that its measurement result can be become apparent from is greater than the percentage error of measurement result when hop count N is equal to 4.
When hop count N is more than 4, the percentage error of its measurement result coil diameter d ranges shown in Fig. 6 can be become apparent from
It is interior to be respectively less than 0.1%.It is that complex chart 6 obtains as a result, when coil diameter d is smaller, the percentage of the bigger measurement results of hop count N misses
Poor smaller, when coil diameter d is larger, the percentage error of measurement result is close under different coil hop count N.Therefore, synthesis is examined
Consider measurement accuracy and cost, 4 sections of coils is selected to constitute Rogowski coil to which current sensor be made.
Pass through first Rogowski coil 3 and second Rogowski coil 4 using 4 12 head and the tail of the round bar
It surround and connects to forming square structure so that easy to process and coiling, and the energy more coil turns of coiling in smaller space,
It can be easily mounted in smaller space.
Further, the insulation board 2 includes the first semi-ring 13, the second semi-ring 14, the first coupling head 15 and second connection
First 16；
One end of first semi-ring 13 is connected by first coupling head 15 with one end of second semi-ring 14；
The other end phase that the other end of first semi-ring 13 passes through second coupling head 16 and second semi-ring 14
Even.
Specifically, the first Rogowski coil 3 and the second Rogowski coil 4 are made of 4 sections of coils, by 4 sections of coils
It is divided into two groups, every group of 2 sections of adjacent windings form 2 sections of adjacent windings and constitute L-type, wherein arbitrarily group coil is located at the first semi-ring 13,
Another group of coil is located at the second semi-ring 14.When needing to be detected circuit, one end of the first semi-ring 13 is coupled from first
First 15 one end removes, and insulation board 2 is opened, and forms retractable structure.First semi-ring, 13 by-pass so that tested conducting wire 6
It is stuck among the first semi-ring 13 and the second semi-ring 14, then the first semi-ring 13 is inserted into one end of the first coupling head 15, made whole
A current sensor 1 is in closed hoop.Pass through 11 output signal of the first signal lead 10 and second signal lead, i.e. output electricity
Press Uout, to realize the on-line monitoring of current loop in operation.In turn, the electricity in tested conducting wire 6 can easily be detected
Stream is disconnected without conducting wire 6, can be measured to the current loop in work.Second coupling head 16 facilitates the another of the first semi-ring 13
The other end of one end and the second semi-ring 14 is rotatablely connected and is installed.
Further, first coupling head 15 and second coupling head 16 are plug-in type coupling head；
The both ends of first coupling head 15 and second coupling head 16 are elastic bayonet lock shape.
Specifically, the first coupling head 15 and the second coupling head 16 are plug-in type coupling head, will to be docked using plug-in type
First semi-ring 13 and the second semi-ring 14 are attached, easy for installation, and save installation space.First coupling head 15 and second
The both ends of connector 16 are made elastic bayonet lock shape, laborsaving and convenient for connection.
Further, it is uniform to be all made of enameled wire for the first Rogoswki coils 3 and second Rogowski coil 4
It winds spiral；
The outside of first Rogowski coil 3 and second Rogowski coil 4 is uniform by conductive metal strip
Coiling shielded layer 17；
The outside of the shielded layer is equipped with insulating protective layer 18.
Specifically, the current sensor 1 of the application is due to being a kind of Magnetic Sensor, when being detected, current sensor 1
In a kind of electromagnetic environment.To ensure that the various equipment in same electromagnetic environment of current sensor 1 can work normally and mutually
It does not interfere, that is, improves 1 anti-electromagnetic interference capability of current sensor, by the first Rogowski coil 3 and the 2nd Rogowski lines
The outside of circle 4 is by the uniform coiling shielded layer of conductive metal strip 17.The shielded layer 17 of first coil end 8 and the same end is in series connection
Connection.The shielded layer 17 of first coil end 8 and the same end is in be connected in series with.
Further, the insulation board 2 is epoxy resin board.
Specifically, epoxy resin board is a kind of superior isolation material with high dielectric property, resistance to surface leakage, resistance to electric arc
Material, to ensure the insulation performance of insulation board 2.Epoxy resin board has excellent mechanical property, to ensure first
Rogowski coil 3 and the second Rogowski coil 4 are stably installed on insulation board 2.Epoxy resin board has excellent resistance to
Alkalinity, acid resistance and solvent resistance, to ensure that insulation board 2 has longer service life.
A kind of monitoring system, the monitoring system include the current sensor 1, on the spot module 19, remote end module 20
With optical fiber 21；
The current sensor 1 is electrically connected with the module on the spot 19；
The module on the spot 19 is connect by the optical fiber 21 and the remote end module 20；
The module on the spot 19 includes data acquisition unit 22 and electro-optical signal converting unit 23；
The current sensor 1 is electrically connected by the data acquisition unit 22 with the electro-optical signal converting unit 23；
The data acquisition unit 22 is connect by the electro-optical signal converting unit 23 with the optical fiber 21；
The remote end module 20 includes photoelectric signal transformation unit 24 and data processing and analysis unit 25；
The optical fiber 21 is electrically connected by the photoelectric signal transformation unit 24 with the Data Management Analysis unit 25.
Specifically, it is a kind of structural schematic diagram of monitoring system of the embodiment of the present application referring to Fig. 7.By the first signal lead 10
It is directly connected to second signal lead 11 and module 19 on the spot, to realize that current sensor 1 is electrically connected with module 19 on the spot.Into
And low current range and the signal that high current range measures in high frequency enter module 19 on the spot under power frequency by circuit.
The medium of 21 signal transmission of optical fiber has excellent electrical insulation capability.The electric signal exported through over-current sensor 1
Be acquired by data acquisition unit 22, and have light modulation is digitized by electro-optical signal converting unit 23 after turned on the spot
It is changed to digitized light pulse signal, and remote end module 20 is transferred to by optical fiber 21, using photoelectric signal transformation unit by light
Pulse signal is converted to analog signals, and carries out data processing and analysis by Data Management Analysis unit 25.Analysis result is used
In being carried out to the electric current being tested in conducting wire 6, parameter calculating, trend prediction, data store, waveform is shown.With current sensor
1 entire monitoring system detectio accuracy is high, can effective monitoring current circuit operating status；System sensor is easy for installation,
It is small；Also, signal transmission is carried out using optical fiber 21 so that monitoring system has excellent anti-electromagnetic interference capability, system
Extra error will not be introduced, the stability and reliability of system are improved.
Further, monitoring system further includes non-metal shell 26；
The current sensor 1, the module on the spot 19, the remote end module 20 and the optical fiber 21 are encapsulated in described non-
Inside metal shell 26.
Specifically, non-metal shell 26 be current sensor 1, on the spot module 19, remote end module 20, optical fiber 21 and by
It surveys conducting wire 6 and provides closed, dry environment, to ensure monitoring system reliability service.
It is a kind of flow diagram of monitoring method of the embodiment of the present application referring to Fig. 8.A kind of monitoring method is applied to described
Monitoring system, include the following steps：
Step S1：1 measurement data of the current sensor；
The output data of tested electric current, i.e. the first Rogowski coil 3 and second are obtained by current sensor 1
The output voltage signal of Rogowski coil 4.
Step S2：The signal that the current sensor 1 exports, is transported to module 19 on the spot, and the data acquisition is single
Member 22 collects analog signals；
Output data is transported to module 19 on the spot by the first signal lead 10 and second signal lead 11, and by the spot
Data acquisition unit 22 in module 19 acquires analog signals.
Step S3：Collected analog signals are input to the electro-optical signal converting unit 23, and analog signals are turned
Become digital signal；
Step S4：Digital signal is transferred to the remote end module 20 by the optical fiber 21, and digital signal inputs optical telecommunications
Number converting unit 24, is changed into analog signals again by digital signal；
Step S5：Analog signals are transmitted to the processing that Data Management Analysis unit 25 carries out data.
Data are analyzed according to Data Management Analysis unit 25, realize the real-time detection to circuit-under-test.
By above technical scheme it is found that this application provides a kind of current sensor, the current sensor 1 includes insulation
Plate 2, the first Rogowski coil 3 and the second Rogowski coil 4.First Rogowski coil 3 is fixed on the insulation
The one side of plate 2, second Rogowski coil 4 are fixed on the another side of the insulation board 2.First Rogowski coil
3 the number of turns is less than the number of turns of second Rogowski coil 4.Current sensor can to circuit under power frequency low current range and
The signal of high current range measures in high frequency.To be avoided using traditional using the current sensor 1 of the application
Since there are iron cores when ferromagnetic formula current transformer measures, containing DC component in primary current is easily saturated,
Tested current range becomes smaller, and frequency band is narrow, and pickoff signals are easy distortion.It, will not during measurement amplitude prodigious fault current
There is magnetic saturation phenomenon, there is excellent linear characteristic, be suitably applied to the higher occasion of current measurement required precision.This Shen
The monitoring system comprising above-mentioned current sensor please be additionally provide, and completes the monitoring method of monitoring process.
It should be noted that herein, the relational terms of such as " first " and " second " or the like are used merely to one
A entity is distinguished with another entity, and without necessarily requiring or implying between these entities, there are any this actual
Relationship or sequence.Moreover, other variants such as term " comprising " are intended to non-exclusive inclusion, so that including a system
The equipment of row element includes not only those elements, but also includes having the other element being expressly recited, or further includes for this
The intrinsic element of kind equipment.
Similar portion cross-reference between embodiment provided by the present application, specific implementation mode provided above is only
It is several examples under the total design of the application, does not constitute the restriction of the application protection domain.For those skilled in the art
For member, any other embodiment expanded without creative efforts according to application scheme all belongs to
In the protection domain of the application.
Claims (9)
1. a kind of current sensor, which is characterized in that the current sensor (1) includes insulation board (2), the first Rogowski lines
Enclose (3) and the second Rogowski coil (4)；
The center of the insulation board (2) is equipped with through-hole (5)；
The axis of the through-hole (5) is equipped with conducting wire (6)；
First Rogowski coil (3) is fixed on the one side of the insulation board (2)；
Second Rogowski coil (4) is fixed on the another side of the insulation board (2)；
The number of turns of first Rogowski coil (3) is less than the number of turns of second Rogowski coil (4)；
The axis of first Rogowski coil (3) and second Rogowski coil (4) is equipped with structure snd size phase
Same skeleton (7)；
One end of first Rogowski coil (3) and second Rogowski coil (4) is equipped with first coil end
(8)；
The other end of first Rogowski coil (3) and second Rogowski coil (4) is equipped with the second coil-end
Head (9)；
The first coil end (8) is equipped with the first signal lead (10)；
First signal lead (10) connect with the first coil end (8)；
Second coil end (9) is equipped with second signal lead (11)；
The second signal lead (11) connect with second coil end (9).
2. current sensor as described in claim 1, which is characterized in that the skeleton (7) is made of 4 round bars (12)；
4 round bars (12) pass through first Rogowski coil (3) and second Rogowski coil (4) ring from beginning to end
Square structure is formed around connecting.
3. current sensor as claimed in claim 2, which is characterized in that the insulation board (2) includes the first semi-ring (13), the
Two semi-rings (14), the first coupling head (15) and the second coupling head (16)；
One end of first semi-ring (13) is connected by first coupling head (15) with one end of second semi-ring (14)；
The other end that the other end of first semi-ring (13) passes through second coupling head (16) and second semi-ring (14)
It is connected.
4. current sensor as claimed in claim 3, which is characterized in that first coupling head (15) and second connection
Head (16) is plug-in type coupling head；
The both ends of first coupling head (15) and second coupling head (16) are elastic bayonet lock shape.
5. current sensor as described in claim 1, which is characterized in that the first Rogoswki coils (3) and described
It is spiral that two Rogowski coils (4) are all made of enameled wire uniform winding；
The outside of first Rogowski coil (3) and second Rogowski coil (4) is uniform by conductive metal strip
Coiling shielded layer (17)；
The outside of the shielded layer is equipped with insulating protective layer (18).
6. current sensor as described in claim 1, which is characterized in that the insulation board (2) is epoxy resin board.
7. a kind of monitoring system, which is characterized in that the monitoring system includes such as claim 1 to 6 any one of them electric current
Sensor (1), on the spot module (19), remote end module (20) and optical fiber (21)；
The current sensor (1) is electrically connected with the module on the spot (19)；
The module on the spot (19) is connect by the optical fiber (21) with the remote end module (20)；
The module on the spot (19) includes data acquisition unit (22) and electro-optical signal converting unit (23)；
The current sensor (1) is electrically connected by the data acquisition unit (22) and the electro-optical signal converting unit (23)
It connects；
The data acquisition unit (22) is connect by the electro-optical signal converting unit (23) with the optical fiber (21)；
The remote end module (20) includes photoelectric signal transformation unit (24) and data processing and analysis unit (25)；
The optical fiber (21) is electrically connected by the photoelectric signal transformation unit (24) with the Data Management Analysis unit (25).
8. monitoring system as claimed in claim 7, which is characterized in that monitoring system further includes non-metal shell (26)；
The current sensor (1), the module on the spot (19), the remote end module (20) and the optical fiber (21) are encapsulated in institute
It is internal to state non-metal shell (26).
9. a kind of monitoring method, which is characterized in that be applied to monitoring system as claimed in claim 7 or 8, including following step
Suddenly：
Step S1：Current sensor (1) measurement data；
Step S2：The signal of current sensor (1) output, is transported to module (19) on the spot, and the data acquisition is single
First (22) collect analog signals；
Step S3：Collected analog signals are input to the electro-optical signal converting unit (23), and analog signals are changed
For digital signal；
Step S4：Digital signal is transferred to the remote end module (20) by the optical fiber (21), and digital signal inputs the light
Electric signal converting unit (24), is changed into analog signals again by digital signal；
Step S5：Analog signals are transmitted to the processing that the Data Management Analysis unit (25) carries out data.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201810189204.2A CN108414798A (en) | 2018-03-08 | 2018-03-08 | A kind of current sensor, monitoring system and monitoring method |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810189204.2A CN108414798A (en) | 2018-03-08 | 2018-03-08 | A kind of current sensor, monitoring system and monitoring method |
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| CN108414798A true CN108414798A (en) | 2018-08-17 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201810189204.2A Pending CN108414798A (en) | 2018-03-08 | 2018-03-08 | A kind of current sensor, monitoring system and monitoring method |
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| CN109613320A (en) * | 2018-11-29 | 2019-04-12 | 江阴市星火电子科技有限公司 | Measure low current Rogowski coil |
| CN113092844A (en) * | 2021-04-07 | 2021-07-09 | 云南电网有限责任公司迪庆供电局 | Voltage and current integrated sensing device and clamping sleeve |
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