CN115420912A - Composite insulation straight-through combined sensor with electromagnetic electronic type - Google Patents
Composite insulation straight-through combined sensor with electromagnetic electronic type Download PDFInfo
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- 238000009413 insulation Methods 0.000 title claims abstract description 13
- 239000002131 composite material Substances 0.000 title claims description 17
- 239000003990 capacitor Substances 0.000 claims abstract description 44
- 238000000819 phase cycle Methods 0.000 claims abstract description 27
- 239000004020 conductor Substances 0.000 claims abstract description 10
- 150000001875 compounds Chemical class 0.000 claims abstract description 4
- 238000004080 punching Methods 0.000 claims abstract description 4
- 239000003822 epoxy resin Substances 0.000 claims description 24
- 229920000647 polyepoxide Polymers 0.000 claims description 24
- 229920002379 silicone rubber Polymers 0.000 claims description 14
- 238000005070 sampling Methods 0.000 claims description 11
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical group [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims description 9
- 239000002184 metal Substances 0.000 claims description 9
- 229910052751 metal Inorganic materials 0.000 claims description 9
- 238000005266 casting Methods 0.000 claims description 5
- 230000005684 electric field Effects 0.000 claims description 5
- 238000004804 winding Methods 0.000 claims description 5
- 238000000034 method Methods 0.000 claims description 4
- 229910000976 Electrical steel Inorganic materials 0.000 claims description 3
- 229910045601 alloy Inorganic materials 0.000 claims description 3
- 239000000956 alloy Substances 0.000 claims description 3
- 230000003139 buffering effect Effects 0.000 claims description 3
- 239000000463 material Substances 0.000 claims description 3
- 239000004945 silicone rubber Substances 0.000 claims description 3
- 230000005611 electricity Effects 0.000 claims description 2
- 239000004744 fabric Substances 0.000 claims description 2
- 239000011087 paperboard Substances 0.000 claims description 2
- 238000009434 installation Methods 0.000 abstract description 2
- 238000002955 isolation Methods 0.000 description 7
- 238000005259 measurement Methods 0.000 description 4
- 238000010586 diagram Methods 0.000 description 3
- 230000032683 aging Effects 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 230000018109 developmental process Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000005350 ferromagnetic resonance Effects 0.000 description 1
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- 238000012544 monitoring process Methods 0.000 description 1
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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
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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
- G01R1/18—Screening arrangements against electric or magnetic fields, e.g. against earth's field
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R15/00—Details of measuring arrangements of the types provided for in groups G01R17/00 - G01R29/00, G01R33/00 - G01R33/26 or G01R35/00
- G01R15/14—Adaptations providing voltage or current isolation, e.g. for high-voltage or high-current networks
- G01R15/16—Adaptations providing voltage or current isolation, e.g. for high-voltage or high-current networks using capacitive devices
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R15/00—Details of measuring arrangements of the types provided for in groups G01R17/00 - G01R29/00, G01R33/00 - G01R33/26 or G01R35/00
- G01R15/14—Adaptations providing voltage or current isolation, e.g. for high-voltage or high-current networks
- G01R15/18—Adaptations providing voltage or current isolation, e.g. for high-voltage or high-current networks using inductive devices, e.g. transformers
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R19/00—Arrangements for measuring currents or voltages or for indicating presence or sign thereof
- G01R19/25—Arrangements for measuring currents or voltages or for indicating presence or sign thereof using digital measurement techniques
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Abstract
The utility model provides a take electromagnetism electronic type compound insulation punching formula combination sensor, belongs to electrified magnet electronic type current transformer and voltage transformer degree of depth and fuses sensor technical field, comprises three single-phase combination sensor, a current terminal box, a voltage terminal box totally triplex. The single-phase combined sensor is of a straight-through structure, three-phase A, three-phase B and three-phase C are measured respectively, and a primary conductor shielding net, a zero-sequence coil and a phase-sequence coil of an electromagnetic current transformer, a high-voltage capacitor, a medium-voltage capacitor and the like are arranged in the sensor. The current junction box can convert the phase currents A, B and C and the zero sequence current into analog voltage small signals to be output. The voltage junction box can convert A, B and C phase voltages and zero sequence voltage into analog voltage small signals to be output in a capacitance voltage division mode. The invention has small volume, light weight, installation space saving and compact structure, and is suitable for measuring, metering and protecting three types of power lines with rated voltage of 10kV or below.
Description
Technical Field
The invention belongs to the technical field of a current transformer with an electromagnetic electronic type and a voltage transformer depth fusion sensor, and particularly relates to a composite insulation straight-through combined sensor with an electromagnetic electronic type.
Background
With the development of power systems, smart grids with information, automation and interaction as important features are commonly applied, and electronic sensors are increasingly gaining attention.
The traditional high-voltage metering device is formed by a mutual inductor, an electric energy meter and connecting wires, and the mutual inductor and the electric energy meter are respectively designed, so that the performance matching is poor; the mutual inductor has large volume and complex installation, and particularly, the electromagnetic voltage mutual inductor is easy to generate ferromagnetic resonance to cause burnout, thereby seriously influencing the safety of a power supply system; the precision of the mutual inductor and the electric energy meter is respectively checked, and the precision of the metering device cannot be uniquely determined after combination; the mutual inductor and the electric energy meter need to be connected through a wire, and the problem that the overall metering precision is influenced by human factors exists.
Disclosure of Invention
In order to solve the existing problems, the invention provides: the utility model provides a take electronic type compound insulation punching formula combined sensor of electromagnetism, includes three independent single-phase combined sensor, a current terminal box and a voltage terminal box respectively, three single-phase combined sensor links to each other with ABC three-phase electricity respectively, three single-phase combined sensor passes through the cable conductor and links to each other with current terminal box, voltage terminal box respectively, the current terminal box passes through parallelly connected sampling resistance and converts zero sequence current and phase current into analog voltage small signal and export from the current output line, voltage terminal box passes through isolation coil and converts zero sequence voltage and looks voltage into analog voltage small signal and export from the voltage output line.
The beneficial effects of the invention are as follows:
1. the sensor adopts composite insulation, has good hydrophobicity, can greatly improve pollution flashover voltage, effectively prevents pollution flashover faults, and has the performances of ageing resistance and tracking resistance.
2. The outer layer of the sensor through hole is designed with a shielding net as an equipotential shielding layer, and when the sensor through hole is installed, the shielding net is connected with a primary conductor, so that an electric field around the primary through hole can be more uniform.
3. The secondary output of current and voltage is analog voltage small signal, and is convenient to be connected with digital instrument and microcomputer measurement and control protection equipment, and it has no need of secondary conversion, and its application is very flexible.
4. The system integrates measurement and protection, can quickly, completely and accurately transmit primary information to a computer for data processing or measurement and protection devices such as a digital instrument and the like, and realizes measurement, protection and state monitoring.
Drawings
Fig. 1 is a structural view of a combination sensor.
Fig. 2 is a structure diagram of a primary shielding net.
Fig. 3 is an outline view of a single-phase sensor.
Fig. 4 is a schematic circuit diagram of the current portion of the combined sensor.
Fig. 5 is a schematic circuit diagram of the combined sensor voltage section.
Wherein the reference numerals are: 1. silicone rubber; 2. epoxy resin; 3. a primary shielding mesh; 4. a primary shielding net energy-taking ring; 5. a voltage high side lead; 6. a current zero sequence coil; 7. a current phase-sequence coil; 8. a current coil support; 9. a high-voltage capacitor; 10. a voltage low side conductive rod; 11. a current secondary side lead; 12. a medium voltage capacitor; 13. a current junction box; 14. a voltage junction box; 15. a cable wire; 16. a current output line; 17. a voltage output line;
Detailed Description
1. Example one
A compound insulation punching type combined sensor with an electromagnetic electronic type comprises three independent single-phase combined sensors, a current junction box 13 and a voltage junction box 14, wherein the three single-phase combined sensors are respectively connected with ABC three-phase power, the three single-phase combined sensors are respectively connected with the current junction box 13 and the voltage junction box 14 through cables 15, the current junction box 13 converts zero-sequence current and phase current into analog voltage small signals through parallel sampling resistors and outputs the analog voltage small signals from a current output line 16, and the voltage junction box 14 converts the zero-sequence voltage and phase voltage into analog voltage small signals through an isolation coil and outputs the analog voltage small signals from a voltage output line 17.
The three single-phase combined sensors respectively comprise a current zero-sequence coil 6, a current phase-sequence coil 7 and a current secondary side lead 11, the current zero-sequence coil 6 and the current phase-sequence coil 7 are electromagnetic current transformer coils, an iron core formed by winding ultracrystalline alloy is arranged inside the current zero-sequence coil 6, an iron core formed by winding silicon steel sheets is arranged inside the current phase-sequence coil 7, an enameled wire is wound on the outer layer of the iron core after wrapping insulating and buffering materials to serve as a secondary winding of the coil, enough length of the enameled wire is reserved to extend out of the coil to serve as the current secondary side lead 11, and the current secondary side lead 11 is connected with a current junction box 13 through a cable 15.
Wherein, the current zero sequence coil 6, the current phase sequence coil 7 are separated by the insulating paper board and are bound and fixedly connected by the current coil support 8 cloth belt, and the lower end of the current coil support 8 is fixed on the casting mould as the support.
The single-phase combined sensor further comprises a primary shielding net 3, a primary shielding net energy-taking ring 4, a voltage high-voltage side lead 5, a high-voltage capacitor 9 and a low-voltage side electric conducting rod 10, wherein the primary shielding net 3 is a structural member with two ends being circular metal nets and a middle being a cylindrical metal cylinder, one end of the primary shielding net 3 is connected with the primary shielding net energy-taking ring 4, the primary shielding net energy-taking ring 4 is a metal circular ring with a threaded hole, the primary shielding net energy-taking ring 4 is connected into a tested power grid, the tested power grid is a primary through conductor which is equivalent to a primary wire passing through the middle of the sensor in a hollow mode, namely, a power grid ABC three-phase cable passes through, and the primary shielding net 3 and the tested power grid are in equipotential, so that electric fields around a current zero-sequence coil 6 and a current phase-sequence coil 7 are distributed uniformly;
the high-voltage capacitor 9 is connected with the primary shielding net energy-taking ring 4 through the voltage high-voltage side lead 5 to obtain the voltage of the primary detected conductor, and the voltage is divided by the high-voltage capacitor 9 and then led out through the low-voltage side lead pole 10.
The voltage low-voltage side conducting pole 10 is connected in parallel with the medium-voltage capacitor 12 and then output from the single-phase sensor, the voltage low-voltage side conducting pole is input into a voltage junction box 14 through a cable 15, and phase voltage and zero sequence voltage are converted into analog voltage small signals through the voltage junction box 14 and then output through a voltage output line 17. The medium-voltage capacitor 12 belongs to a capacitor element, is not suitable for being wrapped by epoxy resin in order to ensure stable performance, and is arranged in a cavity of the epoxy resin 2 by utilizing the existing space;
the single-phase combined sensor further comprises epoxy resin 2, a primary shielding net 3, a voltage high-voltage side lead 5, a current zero sequence coil 6, a current phase sequence coil 7, a current coil support 8, a high-voltage capacitor 9, a low-voltage side lead pole 10 and a current secondary side lead 11 are all poured inside the epoxy resin 2 by using vacuum pouring, half of an energy taking ring 4 of the primary shielding net is poured in the epoxy resin 2, the other half of the energy taking ring is exposed, and a medium-voltage capacitor 12 is not poured inside the epoxy resin 2 but is arranged in a cavity of the epoxy resin 2.
The single-phase combined sensor further comprises silicon rubber 1, the silicon rubber 1 is bonded to the surface of the epoxy resin 2 through an APG pressure gel process to form a composite insulating whole, and one end face of the primary shielding net energy-taking ring 4 is exposed out of the silicon rubber 1. Half of the primary shielding net energy-taking ring 4 is poured in the epoxy resin 2, and the other half is exposed to facilitate wiring with a tested circuit;
the umbrella skirt with a large umbrella structure and a small umbrella structure is designed at the lower pillar part of the silicon rubber 1, the size from the tip part to the root part of the large umbrella is P, the distance between the large umbrella and the large umbrella is S, and the ratio of the umbrella distance to the umbrella extension S/P is more than or equal to 0.8. The effect of full skirt enlarges the creep distance and improves the insulating level of the product.
The current junction box 13 outputs analog voltage small signals through sampling resistors R1, R2, R3, and R4.
The voltage junction box 14 outputs analog voltage small signals through the isolation coils T1, T2, T3, T4, T5 and T6.
The single-phase combined sensor is in a pillar shape, the umbrella skirt at the lower part is in a large umbrella shape and a small umbrella shape, and the middle part is in a straight-through structure. The single-phase combined sensor is characterized in that a sensor body is integrally formed by epoxy resin 2, a silicon rubber 1 insulating layer is arranged outside the epoxy resin 2, and composite insulation is realized by two insulating materials.
As shown in fig. 1, the current zero-sequence coil 6 and the current phase-sequence coil 7 are electromagnetic current transformer coils, an iron core made of an ultra-microcrystalline alloy is arranged inside the current zero-sequence coil 6, and an iron core made of a silicon steel sheet is arranged inside the current phase-sequence coil 7. After the outer layer of the iron core is bound with an insulating and buffering material, an enameled wire is wound to be used as a secondary winding of the coil, and the enameled wire is reserved with enough length to extend out of the coil to be used as a current secondary side lead 11.
As shown in fig. 1, the upper end of the current coil support 8 is bound and fixed with the current zero sequence coil 6 and the current phase sequence coil 7, and the lower end is fixed on the casting mold as a support. The current zero sequence coil 6 and the current phase sequence coil 7 output corresponding secondary current by inducing a magnetic field generated by a primary detected conductor passing through the sensor, and the secondary current is output from the single-phase sensor through a current secondary side lead 11. The currents output by the three single-phase sensors are input into a current junction box 13 through a cable 15, and finally the phase currents and the zero-sequence currents are converted into analog voltage small signals through the current junction box 13 and output through a current output line 16.
As shown in fig. 1 and 2, the primary shielding net 3 is a structural member with two ends being circular metal nets and a middle being a cylindrical metal cylinder, one end of the primary shielding net 3 is connected with the primary shielding net energy-taking ring 4, and the primary shielding net energy-taking ring 4 is a metal ring with a threaded hole. In actual operation, the primary shielding net energy-taking ring 4 is connected to a power grid to be tested, and the primary shielding net 3 and the power grid to be tested are at the same potential, so that electric fields around the current zero-sequence coil 6 and the current phase-sequence coil 7 are uniformly distributed, and partial discharge caused by nonuniform electric fields is avoided.
As shown in fig. 1, the high-voltage capacitor 9 is connected to the primary shielding mesh energy-taking ring 4 through the voltage high-voltage side lead 5 to obtain the voltage of the primary conductor to be tested. After voltage is divided by a high-voltage capacitor 9, the voltage is led out through a low-voltage side conducting pole 10 and then is output from the single-phase sensor after being connected with a medium-voltage capacitor 12 in parallel. The voltages output by the three single-phase sensors are input into a voltage junction box 14 through a cable 15, and finally the phase voltages and the zero sequence voltages are converted into small analog voltage signals through the voltage junction box 14 and output through a voltage output line 17.
As shown in fig. 1, a primary shielding mesh 3, a voltage high-voltage side lead 5, a current zero-sequence coil 6, a current phase-sequence coil 7, a current coil bracket 8, a high-voltage capacitor 9, a voltage low-voltage side lead pole 10, and a current secondary side lead 11 are all cast inside an epoxy resin 2 by using a vacuum casting technique, and the epoxy resin 2 provides insulation between these components. Half of the primary shielding net energy-taking ring 4 is poured in the epoxy resin 2, and the other half is exposed. The medium voltage capacitor 12 is not cast inside the epoxy resin 2 but is placed inside the cavity of the epoxy resin 2.
As shown in fig. 1, a silicon rubber 1 is adhered to the surface of an epoxy resin 2 by an APG pressure gelation process to form a composite insulating whole. The silicone rubber 1 has excellent outdoor performance, good hydrophobicity, ageing resistance and tracking resistance. One end face of the primary shielding net energy-taking ring 4 is exposed out of the silicon rubber 1.
As shown in figure 3, the lower pillar part of the silicon rubber 1 is designed with a shed with a large and small umbrella structure, the size from the tip part to the root part of the large umbrella is P, the distance between the large umbrella and the large umbrella is S, and the ratio of the umbrella distance to the umbrella extension S/P is more than or equal to 0.8.
2. The principle of signal acquisition and output of the current part of the combined sensor is as follows:
as shown in fig. 4, phase a current is measured by a phase a sensor consisting of TA1 and TA2, phase B current is measured by a phase B sensor consisting of TA3 and TA4, and phase C current is measured by a phase C sensor consisting of TA5 and TA 6.
TA1, TA3 and TA5 are phase sequence coils of the electromagnetic current transformer; the primary large current of the phase A passes through a coil TA1 and then outputs a phase sequence small current IaS1IaS2 of the phase A, the primary large current of the phase B passes through a coil TA3 and then outputs a phase sequence small current IbS1IbS2 of the phase B, and the primary large current of the phase C passes through a coil TA5 and then outputs a phase sequence small current IcS1IcS2 of the phase C.
TA2, TA4 and TA6 are zero sequence coils of the electromagnetic current transformer; the primary large current of the phase A passes through a coil TA2 and then outputs a phase A zero-sequence small current, the primary large current of the phase B passes through a coil TA4 and then outputs a phase B zero-sequence small current, and the primary large current of the phase C passes through a coil TA6 and then outputs a phase C zero-sequence small current; the single-phase zero-sequence small currents of the three phases A, B and C output by the TA2, TA4 and TA6 are connected in parallel and are combined and output as three-phase zero-sequence small current IoS1IoS2.
R1, R2 and R3 are sampling resistors of A, B and C phases; the phase sequence A low current IaS1IaS2 is connected with the phase sampling resistor R1 in parallel, and an analog voltage small signal VaVn of the phase current A is output; b phase sequence small current IbS1IbS2 is connected with a B phase sampling resistor R2 in parallel, and an analog voltage small signal VbVn of B phase current is output; the C-phase sequence small current ICS1ICS2 is connected with the C-phase sampling resistor R3 in parallel, and an analog voltage small signal VcVn of the C-phase current is output; A. the Vn terminals of the B and C three-phase analog voltage small signals share 1 output terminal.
R4 is a zero sequence sampling resistor; the three-phase zero-sequence small current IoS1IoS2 is connected in parallel with the zero-sequence sampling resistor R4 to output a zero-sequence analog voltage small signal Vovon.
By the principle, the A, B and C three-phase large currents of three-phase power can be respectively output as an A-phase analog voltage small signal VaVn, a B-phase analog voltage small signal VVbVn, a C-phase analog voltage small signal VcVn and a zero-sequence analog voltage small signal VoVovon through 6 output terminals.
3. The principle of signal acquisition and output of the voltage part of the combined sensor is as follows:
the voltage part of the combined sensor is realized by dividing the voltage through a capacitive voltage divider, the primary high voltage is divided into lower intermediate voltage, and the lower intermediate voltage is converted into a standard analog voltage small signal through an isolation coil.
As shown in fig. 5, the a-phase voltage is measured by an a-phase sensor composed of Ca1 and Ca2, the B-phase voltage is measured by a B-phase sensor composed of Cb1 and Cb2, and the C-phase voltage is measured by a C-phase sensor composed of Cc1 and Cc 2.
The capacitive voltage divider of the phase A sensor is formed by connecting a high-voltage capacitor Ca1 and a medium-voltage capacitor Ca2 in series, the high-voltage capacitor Ca1 is a capacitor between a high-voltage end of a phase A of a power grid and a medium-voltage terminal Vada, the medium-voltage capacitor Ca2 is a capacitor between the medium-voltage terminal Vada and a grounding point, and isolation coils T1 and T2 are connected in parallel at two ends of the medium-voltage capacitor Ca2 to convert intermediate voltage after voltage division of the capacitive voltage divider into a phase A analog voltage small signal an and a phase A zero-sequence analog voltage small signal dadn.
The capacitive voltage divider of the B-phase sensor is formed by connecting a high-voltage capacitor Cb1 and a medium-voltage capacitor Cb2 in series, the high-voltage capacitor Cb1 is a capacitor between a high-voltage end of a B-phase of a power grid and a medium-voltage terminal Vbda, the medium-voltage capacitor Cb2 is a capacitor between the medium-voltage terminal Vbda and a grounding point, and isolation coils T3 and T4 are connected to two ends of the medium-voltage capacitor Cb2 in parallel, so that the intermediate voltage after voltage division of the capacitive voltage divider is converted into a B-phase analog voltage small signal bn and a B-phase zero-sequence analog voltage small signal dadn.
The capacitive voltage divider of the C-phase sensor is formed by connecting a high-voltage capacitor Cc1 and a medium-voltage capacitor Cc2 in series, the high-voltage capacitor Cc1 is a capacitor between a high-voltage end of a C-phase of a power grid and a medium-voltage terminal Vcda, the medium-voltage capacitor Cc2 is a capacitor between the medium-voltage terminal Vcda and a grounding point, and isolation coils T5 and T6 are connected to two ends of the medium-voltage capacitor Cc2 in parallel, so that intermediate voltage after voltage division of the capacitive voltage divider is converted into a C-phase analog voltage small signal cn and a C-phase zero-sequence analog voltage small signal dadn.
A. And B and C three-phase single-phase zero-sequence analog voltage small signal output ends are connected in a triangular mode according to an opening, and the combined analog voltage small signals output by the dadn end are three-phase voltage zero-sequence signals.
A. The single-phase voltage terminal n and the zero-sequence voltage terminal dn of the three phases B and C are combined into a terminal n (dn).
By the principle, the A, B and C three-phase large voltages of the three-phase power can be respectively output as an A-phase analog voltage small signal an (dn), a B-phase analog voltage small signal bn (dn), a C-phase analog voltage small signal cn (dn) and a zero-sequence analog voltage small signal dan (dn) through 5 output terminals.
The above description is only for the preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art should be considered to be within the technical scope of the present invention, and the technical solutions and their concepts should be equivalent or changed within the technical scope of the present invention.
Claims (10)
1. The utility model provides a take electronic type compound insulation punching formula combined sensor of electromagnetism, characterized in that, including three independent single-phase combined sensor each other, a current terminal box (13) and a voltage terminal box (14), three single-phase combined sensor links to each other with ABC three-phase electricity respectively, three single-phase combined sensor passes through cable conductor (15) and links to each other with current terminal box (13), voltage terminal box (14) respectively, current terminal box (13) are through parallelly connected sampling resistor with zero sequence current and phase current transform analog voltage small signal and export from current output line (16), voltage terminal box (14) are through isolating coil with zero sequence voltage and phase voltage transform analog voltage small signal and export from voltage output line (17).
2. The charged-electromagnetic-type composite insulated feedthrough combined sensor as recited in claim 1, wherein each of the single-phase combined sensors comprises a current zero-sequence coil (6), a current phase-sequence coil (7) and a current secondary-side lead (11), the current zero-sequence coil (6) and the current phase-sequence coil (7) are electromagnetic current transformer coils, an iron core made of ultra-microcrystalline alloy is arranged inside the current zero-sequence coil (6), an iron core made of silicon-steel sheet is arranged inside the current phase-sequence coil (7), an enameled wire is wound on the outer layer of the iron core after being wrapped with an insulating and buffering material and used as a secondary winding of the coil, the enameled wire is left with enough length to extend out of the coil and used as the current secondary-side lead (11), and the current secondary-side lead (11) is connected with a current junction box (13) through a cable (15).
3. The charged-electromagnetic electronic composite insulated feed-through combination sensor according to claim 2, characterized in that the current zero-sequence coil (6) and the current phase-sequence coil (7) are separated by an insulating paper board and are bound and fixedly connected by a current coil support (8) cloth tape, and the lower end of the current coil support (8) is fixed on a casting mold as a support.
4. The charged-electromagnetic-electronic composite insulation feedthrough combined sensor according to claim 2, further comprising a primary shielding net (3), a primary shielding net energy-taking ring (4), a voltage high-voltage side lead (5), a high-voltage capacitor (9) and a voltage low-voltage side conductive rod (10), wherein the primary shielding net (3) is a structural member with two ends being circular metal nets and a middle being cylindrical metal cylinder, one end of the primary shielding net (3) is connected with the primary shielding net energy-taking ring (4), the primary shielding net energy-taking ring (4) is a metal circular ring with a threaded hole, the primary shielding net energy-taking ring (4) is connected into the measured grid, the measured grid is a primary feedthrough conductor equivalent to a primary wire passing through the middle of the sensor, i.e. a grid ABC three-phase cable passes through, the primary shielding net (3) and the measured grid are at equal potential, so that the electric field around the current zero-sequence coil (6) and the current phase sequence coil (7) is uniformly distributed;
the high-voltage capacitor (9) is connected with the primary shielding net energy-taking ring (4) through a voltage high-voltage side lead (5) to obtain the voltage of a primary detected conductor, and the voltage is divided by the high-voltage capacitor (9) and then is led out through the low-voltage side conducting rod (10).
5. The magnetoelectric composite insulating feedthrough combination sensor according to claim 4, characterized in that the voltage low-voltage side conducting rod (10) is connected in parallel with the medium-voltage capacitor (12) and then output from the single-phase sensor, and then input into the voltage junction box (14) through the cable (15), and the voltage junction box (14) converts the phase voltage and the zero sequence voltage into analog voltage small signals and outputs the analog voltage small signals through the voltage output line (17).
6. The charged-magnet electronic composite insulated feedthrough combination sensor according to claim 5, characterized in that the single-phase combination sensor further comprises epoxy resin (2), the primary shielding mesh (3), the voltage high-voltage side lead (5), the current zero-sequence coil (6), the current phase-sequence coil (7), the current coil support (8), the high-voltage capacitor (9), the low-voltage side conductive rod (10), and the current secondary side lead (11) are all cast inside the epoxy resin (2) using vacuum casting, half of the primary shielding mesh energy-extracting ring (4) is cast inside the epoxy resin (2), the other half is exposed, the medium-voltage capacitor (12) is not cast inside the epoxy resin (2), but is placed inside the cavity of the epoxy resin (2).
7. The charged-magnet electronic composite insulation feed-through combination sensor according to claim 6, wherein the single-phase combination sensor further comprises silicon rubber (1), the silicon rubber (1) is bonded on the surface of the epoxy resin (2) through an APG pressure gel process to form a composite insulation whole, and one end face of the primary shielding net energy-taking ring (4) is exposed out of the silicon rubber (1).
8. The charged-electromagnetic-electronic-type composite insulated straight-through combined sensor according to claim 7, characterized in that the lower pillar part of the silicone rubber (1) is designed with a shed with a large-small umbrella structure, the size from the tip to the root of the large umbrella is P, the distance between the large umbrella and the large umbrella is S, and the S/P ratio of the umbrella distance to the umbrella extension is not less than 0.8.
9. The charged-magnet electronic composite insulated feed-through combi-sensor according to claim 1, characterized in that the current junction box (13) realizes analog voltage small signal output through sampling resistors R1, R2, R3, R4.
10. The charged-electromagnetic electronic composite insulated feedthrough combination sensor according to claim 1, characterized in that the voltage junction box (14) enables analog voltage small-signal output by isolating coils T1, T2, T3, T4, T5, T6.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202211070814.3A CN115420912A (en) | 2022-09-02 | 2022-09-02 | Composite insulation straight-through combined sensor with electromagnetic electronic type |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202211070814.3A CN115420912A (en) | 2022-09-02 | 2022-09-02 | Composite insulation straight-through combined sensor with electromagnetic electronic type |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN117214505A (en) * | 2023-09-28 | 2023-12-12 | 国网江苏省电力有限公司宿迁供电分公司 | ECT/EVT and insulating sleeve depth fusion type sensor |
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