CN101650403B - Current sensor for polluted insulator leakage of AC high-voltage electric transmission line - Google Patents
Current sensor for polluted insulator leakage of AC high-voltage electric transmission line Download PDFInfo
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- 229910052802 copper Inorganic materials 0.000 claims abstract description 77
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Abstract
The invention relates to a current sensor for the polluted insulator leakage of an AC high-voltage electric transmission line, in particular to a current sensor for monitoring pollution flashover of an electric transmission line. The current sensor mainly comprises a Rogowski coil with an iron core, a copper shielding shell and a coaxial cable joint and is characterized in that the iron core of the Rogowski coil is in a two semi-circle ring shape and is provided with two windings; and the shielding shell consists of a hollow groove in the two semi-circle ring shape and an upper cover in the two semi-circle ring shape. The invention has the advantages of simple assembling and disassembling process, very convenient field assembly and disassembly, high leakage current measuring precision, wide frequency band, good linearity, safe and reliable operation, and the like, thereby being widely used for newly-established and operated high-voltage electric transmission lines.
Description
Technical field
The invention belongs to electrical equipment pollution flashover on-line monitoring technique field, be specifically related to the leakage current sensor of transmission line of electricity pollution flashover monitoring.
Background technology
Pollution flashover is one of catastrophic failure of harm power system transmission line safety.In recent years, China's pollution flashover accident constantly took place, and had caused very big loss to national economy.Because leakage current is closely related with the pollution flashover process, the research leakage current has great significance to grasping pollution flashover mechanism and carrying out the pollution flashover early warning, and leakage current measurement device then is the main means of research leakage current.
Leakage current sensor can be divided into electric contact current sensor and non-electric contact current sensor from installation form.Electric contact current sensor is shunt or collector ring normally, though can reach the higher precision and the frequency band of broad, adopts this mode to want short circuit a slice insulator usually, has reduced the insulating property of circuit, and this is unallowed in a lot of occasions.Existing contactless leakage current sensor, as on February 20th, 2008 disclosed publication number be " high precision broad frequency contaminated insulator leakage current sensor " patent of CN101126785A, disclosed current sensor is made up of the Rogowski coil of ribbon core and integration amplifying unit and concentric cable, and the Rogowski coil is made of annular core, coil, insulation film, permalloy film, iron sheet film, shielding box and BNC.This sensor major defect is: this sensor is a core-theaded type closed loop current sensor, it is extremely inconvenient when annular core loads and unloads at the scene, especially for the circuit that has put into operation, must earlier circuit be stopped transport during loading and unloading, pull down insulator chain again, sensor could be loaded and unloaded on circuit then, very inconvenient, it is consuming time to take a lot of work.The input that this has just increased power department manpower, financial resources greatly can not satisfy the requirement of power system security economy.
Summary of the invention
The objective of the invention is deficiency at existing contactless leakage current sensor, a kind of current sensor for polluted insulator leakage of AC high-voltage electric transmission line is provided, have easy to loading and unloading, precision is high, bandwidth, the linearity is good, antijamming capability is strong and satisfy characteristics such as engineering actual motion requirement.
The technical scheme that realizes the object of the invention is: a kind of current sensor for polluted insulator leakage of AC high-voltage electric transmission line mainly comprises Rogowski coil and the screening can and the coaxial fitting of ribbon core.The Rogowski coil is made up of iron core and winding, feature is: iron core is 2 semi-round ring shape iron cores, the material of 2 semi-round ring shape iron cores is a ferrite, and the internal diameter of each semi-round ring shape iron core is that 42mm～44mm, external diameter are that 65mm～67mm, thickness are 17mm～19mm.2 synthetic 1 annular iron cores of semi-round ring shape iron core group.Winding is divided into 2 windings: number of turn of copper enameled wire formation that tight coiling diameter is 0.5mm～0.65mm on the semi-round ring shape iron core in top is 65～75 winding, and in the outlet of the winding at these iron core two ends, respectively with a copper contact pin and the welding of copper enamel-cover the end of a thread; Closely coiling diameter is that to constitute another number of turn be 65～75 winding for the copper enameled wire of 0.5mm～0.65mm on another semi-round ring shape iron core of bottom, two taps are cut off and drawn in place, center at this iron core with the copper enameled wire, two taps are welded on respectively on the cable core and crust of a coaxial fitting, and respectively a copper jack and copper enamel-cover the end of a thread are welded in the winding outlet at these iron core two ends.2 copper contact pins and 2 copper jacks are embedded in respectively in the insulating fixing piece of 4 epoxy resin formations, 4 insulating fixing piece are bonded in 4 L shaped insulation fixed installation grooves 2 semi-round ring shape groove outer wall two ends of copper shield shell scribing with glue respectively, and the copper jack at a semi-round ring shape iron core of copper contact pin and the bottom two ends at semi-round ring shape iron core two ends, top aligns respectively, two copper contact pins insert respectively in the two bronze medal jacks, with 2 windings winding that to connect into 1 number of turn be 130～150 circles.The material of screening can is a copper material, and the copper shield shell mainly is made of the groove of 2 semi-round ring shapes and the loam cake of 2 semi-round ring shapes.Place the winding of 2 band semi-round ring shape iron cores in 2 semi-round ring shape grooves respectively, 2 semi-round ring shape loam cakes are fixed on the groove of 2 semi-round ring shapes by bolt respectively, in order to the winding of boundary belt semi-round ring shape iron core.On the outer wall at semi-round ring shape groove two ends, top, be carved with L shaped insulation fixed installation groove respectively, and be welded with housing mount respectively in the outside, two ends of its groove outer wall, also be drilled with screw respectively in the outer end of two housing mount.On the outer wall at semi-round ring shape groove two ends, bottom, and corresponding to cutting place on the semi-round ring shape groove outer wall of top, be carved with L shaped insulation fixed installation groove respectively, and be welded with housing mount respectively in the outside, the two ends of its groove outer wall, outer end in two housing mount also is drilled with screw respectively, it also is the inverted T-shaped cable splice fixture of through hole at the center of being welded with, middle part of its groove, the central through hole of cable splice fixture is passed in 2 extension line taps of winding, is welded on the concentric cable street corner.The groove interior diameter of 2 semi-round ring shapes be 30mm～35mm, overall diameter be 95mm～100mm, highly for 26mm～30mm; The inner wall thickness of the groove of semi-round ring shape is that 3mm～5mm, outer wall thickness are 8mm～12mm; The interior diameter of semi-round ring shape loam cake is that 30mm～35mm, overall diameter are that 95mm～100mm, thickness are 3mm～5mm.The size of coaxial fitting fixture determines according to the coaxial fitting size.A slit that width is 1.0mm～1.5mm, the measuring accuracy that has influence on sensor in order to prevent to form eddy current have been offered at the inwall of copper shield shell.Installing a layer thickness uniformly at the outside surface of screening can is the epoxy resin layer of 4mm～6mm, plays insulation and waterproof action.Because this leakage current sensor is to be enclosed within the leakage current that detects insulator on the connection hardware ball-head link of tested insulator chain upper end, therefore the size of leakage current sensor is that the leakage current signal that this leakage current sensor collects is transferred to on-the-spot weak current amplifying unit and subsequent treatment system by concentric cable by the size decision of ball-eye.The umber of turn of leakage current sensor of the present invention is 130～150 circles, and detecting the leakage current amplitude range is 0.5mA～500mA, and frequency range is 10Hz～30kHz, and sensitivity is 57.8～61.1mV/mA.
After the present invention adopted technique scheme, principal feature was as follows:
1, leakage current sensor of the present invention is to be sleeved on the ball-eye of insulator upper end, its size is by the size decision of ball-eye, and the size of ball-eye is all much smaller with respect to the size of other junction of insulator chain, therefore the volume and weight of sensor of the present invention is less relatively, easily on-the-spot loading and unloading and operation.
2, the iron core of leakage current sensor of the present invention is selected the Ferrite Material with high magnetic permeability for use, precision height, bandwidth, the linearity are good, both guaranteed the measurement requirement of coil, what the surface of Ferrite Material processed easily simultaneously is very smooth, to the requirement of ferromagnetic materials surface finish, this is the not available advantage of ferromagnetic material of other kind when well having satisfied the butt joint of semi-circular iron core.
3, the screening can of leakage current sensor of the present invention adopts copper material, has the advantages that shield effectiveness is good and physical strength is high, and will connect copper contact pin and the copper jack is fixed on its outer wall, provides support for the winding realization is electrically connected.Simultaneously with thickness be the epoxy resin of 4mm～6mm with copper shield shell parcel, in order to copper shield shell and working line insulation and play waterproof action, therefore can guarantee reliable, safe operation.
4, leakage current sensor of the present invention is that 2 semi-round ring shapes assemble, load and unload very convenient, only two pairs of copper contact pin and butt joints of copper jack that are fixed on the winding two ends in the screening can need be tightened the bolt on the outer shell outer wall then and are just finished loading and unloading when loading and unloading at the scene.Insulator chain need not be pulled down, use easily.
Leakage current sensor use of the present invention is: at first the bolt on the screening can is taken off, then with sensor sleeve of the present invention on ball-eye, bolt is tightened, the slit of sealing the joint with anti-cement or marine glue gets final product at last.Cargo handling process is extremely simple.
Leakage current sensor of the present invention can be widely used in newly-built ultra-high-tension power transmission line and the ultra-high-tension power transmission line that put into operation in.
Description of drawings
Fig. 1 is a structural drawing of the present invention;
Among the figure: 1 winding, 2 bronze medal jacks, 3 copper contact pins, 4 bolts, 5 screws, 6 epoxy resin layers, 7 outer walls, 8 inwalls, 9 iron cores, 10 insulating fixing piece, 11 fixed installation grooves, 12 cable splice fixtures, 13 coaxial fittings, 14 housing mount, 15 bolts.
Fig. 2 is the amplitude-versus-frequency curve figure of present embodiment 1 leakage current sensor actual measurement;
Fig. 3 is the linearity curve of present embodiment 1 leakage current sensor gamut;
Among the figure: horizontal ordinate is for once surveying electric current I
i, ordinate is secondary side voltage V
o
Fig. 4 is the linearity curve of 0.5mA～10mA weak current for present embodiment 1 leakage current sensor primary side current;
Among the figure: horizontal ordinate is for once surveying electric current I
i, ordinate is secondary side voltage V
o
Fig. 5 is the performance test figure of present embodiment 1 leakage current sensor actual measurement;
Among the figure: curve a is the output signal of embodiment 1 leakage current sensor, and curve b is the signal that function generator produces, signal in contrast, and frequency is 50Hz.
Fig. 6 is the performance test figure of present embodiment 1 leakage current sensor actual measurement;
Among the figure: curve a is the output signal of embodiment 1 leakage current sensor, and curve b is the signal that function generator produces, signal in contrast, frequency 250Hz.
Fig. 7 is the performance test figure of present embodiment 1 leakage current sensor actual measurement;
Among the figure: curve a is the output signal of embodiment 1 leakage current sensor, and curve b is the signal that function generator produces, signal in contrast, frequency 450Hz.
Fig. 8 is a leakage current oscillogram under the slight filthy situation of present embodiment 1 leakage current sensor actual measurement;
Fig. 9 is a leakage current oscillogram under the filthy situation of the moderate of present embodiment 1 leakage current sensor actual measurement;
Figure 10 is a leakage current oscillogram under the filthy situation of the severe of present embodiment 1 leakage current sensor actual measurement;
Figure 11 is the leakage current oscillogram of present embodiment 1 leakage current sensor actual measurement;
Among the figure: curve a is for detecting the leakage current waveform that the resistance two ends record, and curve b is the leakage current waveform that leakage current sensor of the present invention records, and the voltage that test is applied is 15kV.
Figure 12 is the leakage current oscillogram of present embodiment 1 leakage current sensor actual measurement.
Among the figure: curve a is for detecting the leakage current waveform that the resistance two ends record, and curve b is the leakage current waveform that leakage current sensor of the present invention records, and the voltage that test is applied is 20kV.
Embodiment
Below by embodiment, further specify the present invention.
As shown in Figure 1, a kind of current sensor for polluted insulator leakage of AC high-voltage electric transmission line mainly comprises Rogowski coil and the screening can and the coaxial fitting 13 of ribbon core.The Rogowski coil is made up of iron core 9 and winding 1, and feature is: iron core 9 is 2 semi-round ring shape iron cores, and the material of 2 semi-round ring shape iron cores 9 is a ferrite, and the internal diameter of each semi-round ring shape iron core 9 is that 44mm, external diameter are that 67mm, thickness are 19mm.2 semi-round ring shape iron cores 9 are combined into 1 annular iron core 9.Winding 1 is divided into 2 windings: number of turn of copper enameled wire formation that tight coiling diameter is 0.65mm on the semi-round ring shape iron core 9 in top is 65 winding, and in winding 1 outlet at these iron core 9 two ends, respectively with a copper contact pin 3 and the welding of copper enamel-cover the end of a thread; Closely coiling diameter is that to constitute another number of turn be 65 winding for the copper enameled wire of 0.65mm on another semi-round ring shape iron core 9 of bottom, two taps are cut off and drawn in place, center at this iron core 9 with the copper enameled wire, two taps are welded on respectively on the cable core and crust of a coaxial fitting 13, and respectively a copper jack 2 and copper enamel-cover the end of a thread are welded in winding 1 outlet at these iron core 9 two ends.2 copper contact pins 3 and 2 copper jacks 2 are embedded in respectively in the insulating fixing piece 10 of 4 epoxy resin formations, 4 insulating fixing piece 10 are bonded in 4 L shaped insulation fixed installation grooves 11 2 semi-round ring shape groove outer wall 7 two ends of copper shield shell scribing with glue respectively, and the copper jack 2 at semi-round ring shape iron core 9 two ends of the copper contact pin 3 at semi-round ring shape iron core 9 two ends, top and bottom aligns respectively, two copper contact pins 3 insert respectively in the two bronze medal jacks 2, with 2 windings 1 winding 1 that to connect into 1 number of turn be 130 circles.The material of screening can is a copper material, and the copper shield shell mainly is made of the groove of 2 semi-round ring shapes and the loam cake of 2 semi-round ring shapes.Place the winding of 2 band semi-round ring shape iron cores in 2 semi-round ring shape grooves respectively, the loam cake of 2 semi-round ring shapes is fixed on the groove of 2 semi-round ring shapes by bolt respectively, in order to the winding of boundary belt semi-round ring shape iron core.On the outer wall 7 at semi-round ring shape groove two ends, top, be carved with L shaped insulation fixed installation groove 11 respectively, and be welded with housing mount 14 respectively in the outside, two ends of its groove outer wall 7, also be drilled with screw respectively in the outer end of two housing mount 14.On the outer wall 7 at semi-round ring shape groove two ends, bottom, and corresponding to cutting place on the top semi-round ring shape groove outer wall 7, be carved with L shaped insulation fixed installation groove 11 respectively, and be welded with housing mount 14 respectively in the outside, the two ends of its groove outer wall 7, outer end in two housing mount 14 also is drilled with screw respectively, it also is the inverted T-shaped cable splice fixture 12 of through hole at the center of being welded with, middle part of its groove, the central through hole of cable splice fixture 12 is passed in 2 extension line taps of winding 1, be welded in the coaxial fitting 13, its cable splice fixture 12 is affixed by bolt 15 and coaxial fitting 13.The groove interior diameter of 2 semi-round ring shapes be 35mm, overall diameter be 100mm, highly for 30mm; Inwall 8 thickness of the groove of semi-round ring shape are that 5mm, outer wall 7 thickness are 12mm; The interior diameter of semi-round ring shape loam cake is that 35mm, overall diameter are that 100mm, thickness are 5mm.The size of coaxial fitting fixture 12 determines according to coaxial fitting 13 sizes.A slit that width is 1.5mm, the measuring accuracy that has influence on sensor in order to prevent to form eddy current have been offered at the inwall 8 of copper shield shell.Installing a layer thickness uniformly at the outside surface of screening can is the epoxy resin layer 6 of 6mm, plays insulation and waterproof action.Because this leakage current sensor is to be enclosed within the leakage current that detects insulator on the connection hardware ball-head link of tested insulator chain upper end, therefore the size of leakage current sensor is that the leakage current signal that this leakage current sensor collects is transferred to on-the-spot weak current amplifying unit and subsequent treatment system by concentric cable by the size decision of ball-eye.Winding 1 number of turn of leakage current sensor of the present invention is 130 circles, and detecting the leakage current amplitude range is 0.5mA～500mA, and frequency range is 10Hz～30kHz, and sensitivity is 61.1mV/mA.
A kind of current sensor for polluted insulator leakage of AC high-voltage electric transmission line, with embodiment 1, wherein: the internal diameter of 2 semi-round ring shape iron cores 9 is that 43mm, external diameter are that 66mm, thickness are that 18mm winding 1 enameled wire diameter is 0.6mm; The groove internal diameter of copper shield shell is that 33mm, external diameter are 98mm, highly are 28mm, and inwall 8 thickness of groove are that 4mm, outer wall 7 thickness are 10mm; The internal diameter of the loam cake of copper shield shell is that 33mm, external diameter are that 98mm, thickness are 4mm; Offering width on the inwall 8 of the groove of copper shield shell is the 1.2mm slit; Outermost layer epoxy resin layer 6 thickness of copper shield shell are 5mm; Winding 1 number of turn of leakage current sensor is 140 circles, and detecting the current amplitude scope is 0.5mA～500mA, and frequency range is 10Hz～30kHz, and sensitivity is about 59.4mV/mA.
A kind of current sensor for polluted insulator leakage of AC high-voltage electric transmission line, with embodiment 1, wherein: the internal diameter of 2 semi-round ring shape iron cores 9 is that 42mm, external diameter are that 65mm, thickness are 17mm; Winding 1 enameled wire diameter is 0.5mm; The internal diameter of the groove of copper shield shell is that 30mm, external diameter are 95mm, highly are 26mm, and inwall 8 thickness of groove are that 3mm, outer wall 7 thickness are 8mm; The internal diameter of the loam cake of copper shield shell is that 30mm, external diameter are that 95mm, thickness are 3mm; On the inwall 8 of the groove of copper shield shell, offer the slit that width is 1.0mm; Outermost layer epoxy resin layer 6 thickness of copper shield shell are 4mm; Winding 1 number of turn of leakage current sensor is 150 circles, and detecting the current amplitude scope is 0.5mA～500mA, and frequency range is 10Hz～30kHz, and sensitivity is about 57.8mV/mA.
Test findings
Leakage current sensor to the embodiment of the invention 1 carries out following test:
1, the test of the amplitude versus frequency characte and the linearity.Method of testing is: produce the sine voltage signal of different voltage magnitudes with function generator, the resistance of known resistance is connected on the voltage signal two ends to produce the current signal of certain amplitude, as the former edge test signal of current sensor.The output signal of current sensor is the input oscillograph after adapter circuit amplifies, read magnitude of voltage by oscillograph, the record test figure also adopts trace-point method to draw out the amplitude versus frequency characte and the linearity curve of current sensor of the present invention, and its result is shown in Fig. 2,3,4.
2, the testing experiment of contaminated insulator leakage current.Test is the organic glass jar with the fog chamber, and volumetric parameter is φ 1000 * 1500mm, and testing transformer is YDW-50/50, rated capacity is 50kVA, rated output voltage is 50kV, and output-current rating is 1A, satisfies IEC60507 and GB/T4584-2004 to exchanging the requirement of pollution test power supply.Test product is the plate-shaped suspension type porcelain insulator, model XP-70.Be 0.05mg/mm with equivalent salt deposit density respectively in the test
2, 0.1mg/mm
2And 0.2mg/mm
2Filthy degree simulate the operating condition of light filth, middle filth and heavy pollution.Test result such as Fig. 8～shown in Figure 12.
Know from above test result, leakage current sensor of the present invention satisfies the requirement of engineering reality to overhead transmission line insulator leakage current on-line monitoring fully, characteristics such as have precision height, bandwidth, the linearity is good, antijamming capability is strong, and load and unload very conveniently, can be widely used in newly-built ultra-high-tension power transmission line and the ultra-high-tension power transmission line that has put into operation.
Claims (5)
1. current sensor for polluted insulator leakage of AC high-voltage electric transmission line, mainly comprise Rogowski coil and the screening can and the coaxial fitting (13) of ribbon core, it is characterized in that iron core (9) is 2 semi-round ring shape iron cores (9), the material of 2 semi-round ring shape iron cores (9) is a ferrite, the internal diameter of each semi-round ring shape iron core (9) is 42mm～44mm, external diameter is 65mm～67mm, thickness is 17mm～19mm, winding (1) is divided into 2 windings: number of turn of copper enameled wire formation that the last tight coiling diameter of a semi-round ring shape iron core (9) is 0.5mm～0.65mm on top is 65～75 winding (1), and in the outlet of the winding (1) at this iron core (9) two ends, respectively with a copper contact pin (3) and the welding of copper enamel-cover the end of a thread; To go up tight coiling diameter be that to constitute another number of turn be 65～75 winding (1) for the copper enameled wire of 0.5mm～0.65mm to another semi-round ring shape iron core (9) in the bottom, two taps are cut off and drawn in place, center at this iron core (9) with the copper enameled wire, two taps are welded on respectively on the cable core and crust of a coaxial fitting (13), and in winding (1) outlet at this iron core (9) two ends, respectively with a copper jack (2) and the welding of copper enamel-cover the end of a thread, 2 copper contact pins (3) and 2 copper jacks (2) are embedded in respectively in the insulating fixing piece (10) of 4 epoxy resin formations, 4 insulating fixing piece (10) are bonded in 4 L shaped insulation fixed installation grooves (11) of 2 semi-round ring shape groove outer walls (7) two ends of copper shield shell scribing with glue respectively, and the copper contact pin (3) at the semi-round ring shape iron core in top (9) two ends aligns respectively with the copper jack (2) at the semi-round ring shape iron core in bottom (9) two ends, two copper contact pins (3) insert respectively in the two bronze medal jacks (2), with 2 windings (1) winding (1) that to connect into 1 number of turn be 130～150 circles, the material of screening can is a copper material, the copper shield shell mainly is made of the groove of 2 semi-round ring shapes and the loam cake of 2 semi-round ring shapes, in 2 semi-round ring shape grooves, place the winding of 2 band semi-round ring shape iron cores respectively, 2 semi-round ring shape loam cakes are fixed on the groove of 2 semi-round ring shapes by bolt respectively, on the outer wall (7) at semi-round ring shape groove two ends, top, be carved with L shaped insulation fixed installation groove (11) respectively, and be welded with housing mount (14) respectively in the outside, the two ends of its groove outer wall (7), outer end in two housing mount (14) also is drilled with screw respectively, on the outer wall (7) at semi-round ring shape groove two ends, bottom, and corresponding to cutting place on the top semi-round ring shape groove outer wall (7), be carved with L shaped insulation fixed installation groove (11) respectively, and be welded with housing mount (14) respectively in the outside, the two ends of its groove outer wall (7), outer end in two housing mount (14) also is drilled with screw respectively, it also is the inverted T-shaped cable splice fixture (12) of through hole at the center of being welded with, middle part of its groove, bottom at cable splice fixture (12) is affixed by bolt (15) and coaxial fitting (13), the central through hole of cable splice fixture (12) is passed in 2 extension line taps of winding (1), be welded in the coaxial fitting (13), the groove interior diameter of 2 semi-round ring shapes is 30mm～35mm, overall diameter is 95mm～100mm, highly be 26mm～30mm; The inwall of the groove of semi-round ring shape (8) thickness is 3mm～5mm, and outer wall (7) thickness is 8mm～12mm; The interior diameter of semi-round ring shape loam cake is that 30mm～35mm, overall diameter are that 95mm～100mm, thickness are 3mm～5mm, the size of coaxial fitting fixture (12) determines according to coaxial fitting (13) size, inwall (8) at the copper shield shell has been offered a slit that width is 1.0mm～1.5mm, and installing a layer thickness uniformly at the outside surface of screening can is the epoxy resin layer (6) of 4mm～6mm.
2. according to the described current sensor for polluted insulator leakage of AC high-voltage electric transmission line of claim 1, the amplitude range that it is characterized in that detecting leakage current is that 0.5mA～500mA, frequency are that 10Hz～30kHz, sensitivity are 57.8～61.1mV/mA.
3. according to the described current sensor for polluted insulator leakage of AC high-voltage electric transmission line of claim 1, the internal diameter that it is characterized in that 2 semi-round ring shape iron cores (9) is 44mm, external diameter is 67mm, thickness is 19mm, the enameled wire diameter of winding (1) is 0.65mm, the number of turn is 130 circles, the internal diameter of the groove of copper shield shell is 35mm, external diameter is 100mm, highly be 30mm, the inwall of groove (8) thickness is 5mm, outer wall (7) thickness is 12mm, the internal diameter of the loam cake of copper shield shell is 35mm, external diameter is 100mm, thickness is 5mm, inwall (8) at the groove of copper shield shell is offered the slit that width is 1.5mm, and outermost layer epoxy resin layer (6) thickness of copper shield shell is 6mm.
4. according to the described current sensor for polluted insulator leakage of AC high-voltage electric transmission line of claim 1, the internal diameter that it is characterized in that 2 semi-round ring shape iron cores (9) is 43mm, external diameter is 66mm, thickness is 18mm, the enameled wire diameter of winding (1) is 0.6mm, the number of turn is 140 circles, the internal diameter of the groove of copper shield shell is 33mm, external diameter is 98mm, highly be 28mm, the inwall of groove (8) thickness is 4mm, outer wall (7) thickness is 10mm, the internal diameter of the loam cake of copper shield shell is 33mm, external diameter is 98mm, thickness is 4mm, inwall (8) at the groove of copper shield shell is offered the slit that width is 1.2mm, and outermost layer epoxy resin layer (6) thickness of copper shield shell is 5mm.
5. according to the described current sensor for polluted insulator leakage of AC high-voltage electric transmission line of claim 1, the internal diameter that it is characterized in that 2 semi-round ring shape iron cores (9) is that 42mm, external diameter are that 65mm, thickness are 17mm; The enameled wire diameter of winding (1) is that 0.5mm, the number of turn are 130 circles, the internal diameter of the groove of copper shield shell be 30mm, external diameter be 95mm, highly for 26mm, the inwall of groove (8) thickness is that 3mm, outer wall (7) thickness are 8mm, the internal diameter of the loam cake of copper shield shell is that 30mm, external diameter are that 95mm, thickness are 3mm, inwall (8) at the groove of copper shield shell is offered the slit that width is 1.0mm, and outermost layer epoxy resin layer (6) thickness of copper shield shell is 4mm.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2009101908535A CN101650403B (en) | 2009-09-15 | 2009-09-15 | Current sensor for polluted insulator leakage of AC high-voltage electric transmission line |
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| CN2009101908535A CN101650403B (en) | 2009-09-15 | 2009-09-15 | Current sensor for polluted insulator leakage of AC high-voltage electric transmission line |
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| CN101650403B true CN101650403B (en) | 2011-08-10 |
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