CN206132914U - High frequency current sensor - Google Patents
High frequency current sensor Download PDFInfo
- Publication number
- CN206132914U CN206132914U CN201621033989.7U CN201621033989U CN206132914U CN 206132914 U CN206132914 U CN 206132914U CN 201621033989 U CN201621033989 U CN 201621033989U CN 206132914 U CN206132914 U CN 206132914U
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- China
- Prior art keywords
- magnetic core
- high frequency
- current sensor
- frequency current
- ring type
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Abstract
The utility model discloses a high frequency current sensor, including two split type metal shielding shell, metal shielding shell's inner wall is seted up flutedly, the embedding has semi -ring type magnetic core in the recess, offer the loop type gap that is used for through magnetic force on the recess, leave the space between semi -ring type magnetic core and the recess, fill in the space has insulating material, when two metal shielding shell's both ends are connected respectively, the loop type magnetic core is constituteed to two semi -ring type magnetic cores in the metal shielding shell, the winding of going up of one of them semi -ring type magnetic core has two sections coils, just the winding opposite direction of two sections coils. The utility model discloses with the principle that the difference is enlargied, introduce high frequency current sensor, the characteristics of the enlarged original information of the effective eliminating interference of make full use of differential circuit and twice have improved high frequency current sensor's interference killing feature effectively to the sensitivity of sensor has greatly improved.
Description
Technical field
This utility model is related to Partial Discharge Detecting Technology field, particularly a kind of to be used for cable and partial discharge of transformer
The High Frequency Current Sensor of test.
Background technology
Partial Discharge Detection is that the high voltage electric equipments such as inspection high-voltage switch gear GIS, transformator, electromotor, power cable are exhausted
The important tests of edge state.In prior art, except supercritical ultrasonics technology and hyperfrequency method can be used directly to high voltage electric equipment
Shelf depreciation measure it is outer, it is also possible to detected in it by detecting the high-frequency current signal of high voltage electric equipment earth lead
The shelf depreciation situation in portion.High frequency electric method not only can realize the cable local discharge that the insulation defect small to some causes
Microsignal detection, and the state of insulation of the apparatus insulated medium such as cable, transformator and generating set can be monitored on-line.Make
To detect and judging the effective ways of partial discharges fault, high frequency electric method is put in the office of electromotor, transformator and high tension cable
It is widely used in Site Detection and on-line monitoring.
High Frequency Current Sensor (HFCT) detects the sensor element of shelf depreciation as high frequency electric detection method, typically makes
Rogowski coil mode is used, multiturn conductive coil is surrounded on the core material of ring-type, high frequency electric draws through core center
The high-frequency alternating magnetic field for rising can produce faradic current in coil.The bandwidth of High Frequency Current Sensor and sensitivity are to weigh
Most important two parameters of sensor performance.Additionally, sensor scene capacity of resisting disturbance is also the weight for weighing sensor performance
Want index.However, there is bandwidth in design in existing High Frequency Current Sensor and sensitivity is not enough or sensitivity is high and frequency
The narrower defect of band, or due to there is electromagnetic shielding defect in design, cause to yet suffer from certain problem in actual applications.
Utility model content
In view of this, the purpose of this utility model is to propose a kind of High Frequency Current Sensor, to improve capacity of resisting disturbance,
Have the advantages that detection sensitivity is high simultaneously.
Based on above-mentioned purpose, the High Frequency Current Sensor that this utility model is provided is included outside two split type metallic shields
Shell, the inwall of the Metal shielding shell opens up fluted, and the groove has been embedded in half ring type magnetic core, opens up on the groove
Have for by the ring-like gap of magnetic force；Space is left between half ring type magnetic core and groove, the space is filled with insulation
Material, the two and half ring type magnetic core groups when the two ends of two Metal shielding shells connect respectively, in the Metal shielding shell
Into ring type magnetic core；Two sections of coils are wound with one of them half ring type magnetic core, and the winding direction of two sections of coils is contrary.
In some embodiments of the present utility model, two sections of coils are twined with the centrage of half ring type magnetic core as axial symmetry
Around.
In some embodiments of the present utility model, the length of two sections of coils, diameter, material and the winding number of turn are homogeneous
Cause.
In some embodiments of the present utility model, the Metal shielding shell includes the magnetic core groove and cover plate of arc, institute
State and cover plate is fixedly connected with the side wall of magnetic core groove, the cover plate is constituted for being embedded in half ring type magnetic core with the inwall of magnetic core groove
Groove.
In some embodiments of the present utility model, the cover plate be L fonts, the opposite side wall and cover plate of the magnetic core groove
Between leave ring-like gap.
In some embodiments of the present utility model, one end of the magnetic core groove lateral wall is hinged by hinge, the other end
It is hinged by hasp, one end of described two magnetic core grooves rotates around hinge, the hasp is used for the another of two magnetic core grooves
Open the latter and close in end.
In some embodiments of the present utility model, location hole is provided with an end face of the magnetic core groove, another
Locating piece is provided with end face, when two magnetic core grooves mutually close, the locating piece on one of magnetic core groove inserts another
In the location hole of magnetic core groove.
In some embodiments of the present utility model, one end of two sections of coils with the earth lead of signal output plug
Connection, the other end is connected respectively with two signal cores of signal output plug.
In some embodiments of the present utility model, the winding number of turn of every section of coil is 1 circle, and the coil is copper sheet, institute
The cross-sectional area for stating coil is 4-10mm2；
The width in the ring-like gap is 2-10mm, and the internal diameter of the ring type magnetic core is 40-55mm, and external diameter is 55-75m,
Highly it is 20-40mm.
In some embodiments of the present utility model, the insulant is polystyrene.
From the above it can be seen that this utility model is incorporated into high frequency electric creatively by the principle of differential amplification
In sensor, make full use of difference channel effectively to eliminate and disturb the characteristics of amplifying primary signal with twice, be effectively improved height
The capacity of resisting disturbance of frequency current sensor, and greatly improve the sensitivity of sensor.These all make what this utility model was provided
High Frequency Current Sensor can more preferably be applied to complicated test environment, effectively improve its Detection results and practicality.
Description of the drawings
Fig. 1 is the structural representation of this utility model embodiment High Frequency Current Sensor；
Fig. 2 is the half-sectional left view of this utility model embodiment High Frequency Current Sensor；
Fig. 3 winds schematic diagram for the coil of this utility model embodiment High Frequency Current Sensor；
Fig. 4 is the equivalent circuit of this utility model embodiment High Frequency Current Sensor；
Fig. 5 is the circuit connection of High Frequency Current Sensor sensitivity test described in the utility model.
Specific embodiment
To make the purpose of this utility model, technical scheme and advantage become more apparent, below in conjunction with specific embodiment, and
Referring to the drawings, this utility model is further described.
It should be noted that the statement of all uses " first " and " second " is for distinguishing in utility model embodiment
The entity of two same names non-equal or the parameter of non-equal, it is seen that " first " " second " only for statement convenience, no
It is interpreted as the restriction to utility model embodiment, subsequent embodiment is no longer illustrated one by one to this.
Referring to Fig. 1 and Fig. 2, the respectively structural representation of this utility model embodiment High Frequency Current Sensor and a half-sectional left side
View.Used as one embodiment of the present utility model, the High Frequency Current Sensor is included outside two split type metallic shields
Shell 1, the inwall of the Metal shielding shell 1 opens up fluted, and the groove has been embedded in half ring type magnetic core 4, on the groove
Offer for by the ring-like gap 9 of magnetic force；Space, the space filling are left between half ring type magnetic core 4 and groove
There is insulant 11, when the two ends of two Metal shielding shells 1 connect respectively, two and half in the Metal shielding shell 1
Ring type magnetic core 4 constitutes a ring type magnetic core.Alternatively, the insulant 11 can be waterproof silicone rubber.It is new as this practicality
One preferred embodiment of type, the width in the ring-like gap 9 is 2-10mm, is passed through for magnetic force, can well shield biography
Various interference signals on the outside of sensor.
As another embodiment of the present utility model, as shown in Fig. 2 the Metal shielding shell 1 includes the magnetic of arc
Core groove 2 and cover plate 3, are fixedly connected with the inwall group of cover plate 3, the cover plate 3 and magnetic core groove 2 on the side wall of the magnetic core groove 2
Into for being embedded in the groove of half ring type magnetic core 4.Preferably, the cover plate 3 is L fonts, the opposite side wall of the magnetic core groove 2 and lid
Ring-like gap 9 is left between plate 3, for by magnetic force.Preferably, the groove be it is half ring-like, with half ring type magnetic core 4
It coincide.Alternatively, the cross section of the groove can be square or rectangle.It should be noted that in this embodiment,
The inner side of the magnetic core groove 2 is semicircle, so that the groove for being formed is half ring-like, the outside of the magnetic core groove 2 can be other
Shape.Alternatively, several installation screw holes 10 are offered on the magnetic core groove 2 and cover plate 3, can be by installing screw by magnetic core
The side wall of groove 2 is fixedly connected with cover plate 3.
Used as a preferred embodiment of the present utility model, the two ends of described two Metal shielding shells 1 are respectively by hinge
Relay part is mutually hinged, to facilitate two Metal shielding shells 1 is taken apart or is closed.Preferably, as shown in figure 1, the magnetic
One end of the lateral wall of core groove 2 is hinged by hinge 6, and the other end is hinged by hasp 7, therefore, one end of described two magnetic core grooves 2
Can rotate around hinge 6, the hasp 7 closes for the other end of two magnetic core grooves 2 to be opened into the latter.
Location hole 12 is provided with one end face of the magnetic core groove 2, locating piece 13 is provided with another end face, it is described
Location hole 13 is inserted in location hole, when two magnetic core grooves 2 mutually close, the locating piece 13 on one of magnetic core groove 2
Insert in the location hole 12 of another magnetic core groove 2, in order to the installation positioning of two magnetic core grooves 2.
As further embodiment of the present utility model, two sections of coils 14 are wound with one and half ring type magnetic cores 4, are such as schemed
Shown in 3, the winding direction of two sections of coils 14 is contrary.Wherein, one end of two sections of coils with signal output plug 15
Earth lead connection, the other end is connected respectively with two signal cores of signal output plug 15.It is preferred that the signal output is inserted
15 can be twin-core differential signal output plug, and one end of the coil 14 is connected with the earth lead of the twin-core plug,
The other end is connected respectively with two signal cores.Preferably, the winding number of turn of two sections of coils 14 is identical, it is oppositely wound wherein
On one and half ring type magnetic cores 4.It is further preferable that two sections of coils 14 wind by axial symmetry of the centrage of half ring type magnetic core 4,
I.e. described two sections of coils 14 are with the centrage of half ring type magnetic core 4 as axisymmetrically reverse-winding.Alternatively, the coil 14 is twined
Can be 1 circle around the number of turn, 2 circles, 3 circles, etc..It is preferred that the differential signal amplitude for guarantee output is equal, two sections of coils
14 length, diameter, material are consistent.
Further, the signal output plug 15 is connected again with the input of preamplifier 16, preamplifier 16
It is connected with signal condition or detector unit (such as oscillograph), it is possible to which the high-frequency current signal to coupling is analyzed.Signal
The output signal of output plug 15 is differential signal, is connected with the preamplifier 16 by twin-concentric cable, it is described before
Put amplifier 16 and differential signal amplification is output as into single-ended signal.Alternatively, the preamplifier 16 is differential signal amplification
Device, its input is differential signal, and output signal is single-ended signal.This utility model creatively by the principle of differential amplification,
In being incorporated into high frequency sensors, make full use of difference channel effectively to eliminate and disturb the characteristics of amplifying primary signal with twice, effectively
Improve the capacity of resisting disturbance of High Frequency Current Sensor, and greatly improve the sensitivity of sensor.
Signal detection sensitivity test embodiment
The current sensor equivalent circuit that this utility model is provided is as shown in figure 4, wherein I1(t) be primary current, U1(t)
And U2T () is respectively the induced voltage of two sections of coils, Ls1And Ls2For the self-induction of two sections of coils, Rs1And Rs2For two coils from
Body resistance, Cs1And Cs2For the stray capacitance of two coils, R is load resistance.Differential signal amplitude to ensure output is equal,
It is required that two sections of loop lengths, diameter material are consistent, i.e. Ls1=Ls2、Rs1=Rs2、Cs1=Cs2, so for same primary current,
Two sections of coils can couple that amplitude is equal, the induced voltage U of opposite in phase1(t) and U2(t)。
In the present embodiment, core material internal-and external diameter used is respectively 48 and 65mm, coil section product 8m2, around wire turn
Number is 1, using 2 reverse winding output difference signals, with conventional current sensors, only exports single-ended letter using with 1 coil
Number as control.Circuit connection is as shown in Figure 5.Signal generator used is RIGOL DG4162, and output signal is a tentering
The sinusoidal signal or pulse signal of value；Signal detector used be RIGOL DS4034 four-way oscillographs, load used
Resistance is 50 ohm of noninductive resistance；Differential signal amplifier used has 3 different amplifications：20th, 40 and 60dB.
Table 1 shows signal generator output different frequency, the sinusoidal signal of different amplitudes, the high frequency electric sensing that this utility model is provided
Device and traditional sensors, the difference of the signal amplitude of output, it is seen that in the range of 1M to 150M, the high frequency that this utility model is provided
The signal that current sensor is coupled to is amplified much larger than traditional sensors.Even if can also have very high inspection to faint electric current
Survey sensitivity.
The High Frequency Current Sensor of table 1 is responded to the signal of different frequency, amplitude
Note：/ represent beyond oscillographic range
Transducer sensitivity is improved as far as possible winds the number of turn it is necessary to less coil.For this purpose, this utility model is using minimum
The winding circle of the number of turn 1, the coil is copper sheet.Alternatively, the sectional area of the coil can be 4-10mm2, sensing can be improved
The upper cut-off frequency of device sensing frequency band and the sensitivity of high band.In the case of coil turn is certain, other adjustable parameters pair
It is exactly its diameter of wire and isolation material in coil, selects the wire that diameter is big, insulant dielectric constant is little to reduce line
Enclose resistance to increase the bandwidth of sensor detection；Another adjustable parameter is exactly magnetic core.The copper sheet can be selected from red copper
Piece, latten(-tin), bronze flake and copper-nickel alloy piece.Preferably, the copper sheet is selected from copper sheet, to improve the detection sensitivity of sensor.
The design of magnetic core includes the internal-and external diameter of magnetic core and height and core material.This utility model with optimal conditions,
Through Theoretical Calculation and actual tests, this utility model preferably uses that 0.5-1.2mm is thick, and the copper sheet of width 5-15mm is used as twining
Coiling, using polystyrene as insulant.Used as another embodiment of the present utility model, this utility model is selected
0.8mm is thick, and width is the copper sheet of 10mm as wound around coil, the winding circle of the number of turn 1, to improve detection sensitivity.As this reality
With another new embodiment, this utility model can be thick from 1mm, width be the copper sheet of 8.8mm as wound around coil,
The winding circle of the number of turn 1, to improve detection sensitivity.Used as further embodiment of the present utility model, this utility model can be selected
0.9mm is thick, and width is the copper sheet of 10mm as wound around coil, the winding circle of the number of turn 1, to improve detection sensitivity.As this reality
With another new embodiment, this utility model can be thick from 1.2mm, width be the copper sheet of 6mm as wound around coil, twine
Around the circle of the number of turn 1, to improve detection sensitivity.The copper sheet
Magnetic core is selected in the good ferrite core of nickel-zinc of high frequency region performance, the size of magnetic core, is to be the bigger the better from principle,
In view of the size of cable itself, its optimal internal diameter just compares fixation, and the internal diameter of this utility model design magnetic core is 40-55mm,
External diameter is 55-75mm, is highly 20-40mm.Used as one embodiment of the present utility model, the internal diameter of the magnetic core is 50mm,
External diameter is 70mm, is highly 30mm, and used as another embodiment of the present utility model, the internal diameter of the magnetic core is 53mm, external diameter
It is highly 35mm for 68mm, used as another embodiment of the present utility model, the internal diameter of the magnetic core is 45mm, and external diameter is
60mm, is highly 28mm, can improve the upper cut-off frequency of sensor sensing frequency band and the sensitivity of high band.Need explanation
, the magnetic core refers to the ring type magnetic core being made up of two and half ring type magnetic cores 4.
Operationally, two Split type metals shield shell around hinge to the High Frequency Current Sensor that this utility model is provided
Open, shielding box is placed on earth cable, close hinge, buckle hasp to close Metal shielding shell.It is faint in cable
High-frequency current signal senses the magnetic field for generating respective change in magnetic core, and the magnetic field of the change senses generation in coil and mutually strains
The electromotive force of change, the output of induction electromotive force Jing signal outputs plug.
As can be seen here, this utility model in being incorporated into High Frequency Current Sensor, fills creatively by the principle of differential amplification
Divide the characteristics of effectively eliminating interference and twice amplification primary signal using difference channel, be effectively improved High Frequency Current Sensor
Capacity of resisting disturbance, and greatly improve the sensitivity of sensor.These all make the high frequency electric sensing that this utility model is provided
Device can more preferably be applied to complicated test environment, effectively improve its Detection results and practicality.
Those of ordinary skill in the art should be understood：The discussion of any of the above embodiment is exemplary only, not
It is intended to imply that the scope of the present disclosure (including claim) is limited to these examples；Under thinking of the present utility model, above reality
Applying can also be combined between example or the technical characteristic in different embodiments, and exist as above of the present utility model
Many other changes of different aspect, for simple and clear their no offers in details.Therefore, it is all in spirit of the present utility model
Within principle, any omission, modification, equivalent, improvement for being made etc. should be included in protection domain of the present utility model
Within.
Claims (10)
1. a kind of High Frequency Current Sensor, it is characterised in that including two split type Metal shielding shells, the metallic shield
The inwall of shell opens up fluted, and the groove has been embedded in half ring type magnetic core, offers on the groove for by magnetic force
Ring-like gap；Space is left between half ring type magnetic core and groove, the space is filled with insulant, when two metals
Two and half ring type magnetic cores composition ring type magnetic core when the two ends of shielding shell connect respectively, in the Metal shielding shell；Wherein
Two sections of coils are wound with one and half ring type magnetic cores, and the winding direction of two sections of coils is contrary.
2. High Frequency Current Sensor according to claim 1, it is characterised in that two sections of coils are with half ring type magnetic core
Centrage is axial symmetry winding.
3. High Frequency Current Sensor according to claim 2, it is characterised in that length, diameter, the material of two sections of coils
Matter and the homogeneous cause of the winding number of turn.
4. High Frequency Current Sensor according to claim 1, it is characterised in that the Metal shielding shell includes arc
Magnetic core groove and cover plate, are fixedly connected with cover plate on the side wall of the magnetic core groove, the cover plate is used with the inwall composition of magnetic core groove
In the groove of embedded half ring type magnetic core.
5. High Frequency Current Sensor according to claim 4, it is characterised in that the cover plate is L fonts, the magnetic core groove
Opposite side wall and cover plate between leave ring-like gap.
6. High Frequency Current Sensor according to claim 4, it is characterised in that one end of the magnetic core groove lateral wall passes through
Hinge is hinged, and the other end is hinged by hasp, and one end of described two magnetic core grooves rotates around hinge, and the hasp is used for two
The other end of individual magnetic core groove is opened the latter and is closed.
7. High Frequency Current Sensor according to claim 4, it is characterised in that arrange on an end face of the magnetic core groove
There is location hole, on another end face locating piece is provided with, when two magnetic core grooves mutually close, determining on one of magnetic core groove
Position block is inserted in the location hole of another magnetic core groove.
8. High Frequency Current Sensor according to claim 1, it is characterised in that one end of two sections of coils is and signal
The earth lead connection of output plug, the other end is connected respectively with two signal cores of signal output plug.
9. High Frequency Current Sensor according to claim 1, it is characterised in that the winding number of turn of every section of coil is 1 circle, institute
It is copper sheet to state coil, and the cross-sectional area of the coil is 4-10mm2；
The width in the ring-like gap is 2-10mm, and the internal diameter of the ring type magnetic core is 40-55mm, and external diameter is 55-75m, height
For 20-40mm.
10. High Frequency Current Sensor according to claim 1, it is characterised in that the insulant is polystyrene.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201621033989.7U CN206132914U (en) | 2016-08-31 | 2016-08-31 | High frequency current sensor |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201621033989.7U CN206132914U (en) | 2016-08-31 | 2016-08-31 | High frequency current sensor |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN206132914U true CN206132914U (en) | 2017-04-26 |
Family
ID=58568285
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201621033989.7U Expired - Fee Related CN206132914U (en) | 2016-08-31 | 2016-08-31 | High frequency current sensor |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN206132914U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106249116A (en) * | 2016-08-31 | 2016-12-21 | 北京兴泰学成仪器有限公司 | High Frequency Current Sensor |
| CN108761266A (en) * | 2018-06-06 | 2018-11-06 | 浙江巨磁智能技术有限公司 | Microminiature patch type leakage current sensor and its assemble method |
-
2016
- 2016-08-31 CN CN201621033989.7U patent/CN206132914U/en not_active Expired - Fee Related
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106249116A (en) * | 2016-08-31 | 2016-12-21 | 北京兴泰学成仪器有限公司 | High Frequency Current Sensor |
| CN108761266A (en) * | 2018-06-06 | 2018-11-06 | 浙江巨磁智能技术有限公司 | Microminiature patch type leakage current sensor and its assemble method |
| CN108761266B (en) * | 2018-06-06 | 2020-06-16 | 浙江巨磁智能技术有限公司 | Subminiature surface-mounted leakage current sensor and assembling method thereof |
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| Date | Code | Title | Description |
|---|---|---|---|
| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20170426 Termination date: 20210831 |