CN117250394B - Anti-interference integrated sensor and manufacturing method thereof - Google Patents
Anti-interference integrated sensor and manufacturing method thereof Download PDFInfo
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- CN117250394B CN117250394B CN202311229777.0A CN202311229777A CN117250394B CN 117250394 B CN117250394 B CN 117250394B CN 202311229777 A CN202311229777 A CN 202311229777A CN 117250394 B CN117250394 B CN 117250394B
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- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 claims description 32
- 229910052802 copper Inorganic materials 0.000 claims description 31
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- 230000001105 regulatory effect Effects 0.000 claims description 15
- 239000000463 material Substances 0.000 claims description 13
- 239000002994 raw material Substances 0.000 claims description 9
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- 239000011810 insulating material Substances 0.000 claims description 3
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- 229910000589 SAE 304 stainless steel Inorganic materials 0.000 description 1
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Classifications
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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
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C39/00—Shaping by casting, i.e. introducing the moulding material into a mould or between confining surfaces without significant moulding pressure; Apparatus therefor
- B29C39/02—Shaping by casting, i.e. introducing the moulding material into a mould or between confining surfaces without significant moulding pressure; Apparatus therefor for making articles of definite length, i.e. discrete articles
- B29C39/10—Shaping by casting, i.e. introducing the moulding material into a mould or between confining surfaces without significant moulding pressure; Apparatus therefor for making articles of definite length, i.e. discrete articles incorporating preformed parts or layers, e.g. casting around inserts or for coating articles
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C69/00—Combinations of shaping techniques not provided for in a single one of main groups B29C39/00 - B29C67/00, e.g. associations of moulding and joining techniques; Apparatus therefore
- B29C69/02—Combinations of shaping techniques not provided for in a single one of main groups B29C39/00 - B29C67/00, e.g. associations of moulding and joining techniques; Apparatus therefore of moulding techniques only
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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
-
- 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
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R3/00—Apparatus or processes specially adapted for the manufacture or maintenance of measuring instruments, e.g. of probe tips
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- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Mechanical Engineering (AREA)
- Measuring Instrument Details And Bridges, And Automatic Balancing Devices (AREA)
Abstract
The invention discloses an anti-interference integrated sensor which comprises a casting body, a hoisting piece arranged in the casting body, a current winding, a high-voltage shielding element, a current-voltage conversion element, a voltage dividing element, a cavity arranged at the bottom in the casting body and a compensation capacitance error adjusting element, wherein a rubber layer is wrapped on the periphery of the casting body, the high-voltage shielding element is coaxially arranged with the current winding, the current-voltage conversion element is electrically connected with the current winding and is used for converting zero sequence current into phase zero sequence voltage small signals, the voltage dividing element is electrically connected with the high-voltage shielding element, and the compensation capacitance error adjusting element is electrically connected with the voltage dividing element. The invention also discloses a manufacturing method of the anti-interference integrated sensor. The sensor solves the technical problems that the existing sensor is unstable in precision and easy to interfere with each other. The sensor manufactured by the manufacturing method has excellent mechanical property, good insulativity, strong anti-interference capability and high metering precision.
Description
Technical Field
The invention relates to the technical field of sensors, in particular to an anti-interference integrated sensor and a manufacturing method thereof.
Background
With the rapid development of distribution networks, the intelligent sensors are widely applied to the distribution networks, and the problems of sensitivity, accuracy and the like of the sensors directly influence the service conditions of power grid monitoring equipment. Based on the current product use and test conditions, the secondary output of the sensor is an analog voltage small signal, the anti-interference performance is poor, the sensor is greatly influenced by transmission cable parameters, and the operation variation requirements of metering precision are difficult to meet in different environment temperature ranges.
In addition, the existing sensor is unreasonable in internal structure arrangement, and cannot ensure that parts among all parts are not mutually interfered while ensuring compactness, so that the accuracy is unstable after operation. The manufacturing method is simple, stable dimensional accuracy cannot be ensured, and the whole mechanical and electrical properties are not ideal. Therefore, there is a need to develop a high-precision, anti-interference, miniaturized integrated sensor that solves at least one of the above technical problems.
Disclosure of Invention
The invention aims to provide an anti-interference integrated sensor, which solves the technical problems of unstable accuracy and easy mutual interference of the existing sensor. The invention further aims to provide a manufacturing method of the anti-interference integrated sensor, and the manufactured sensor is excellent in mechanical performance, good in insulativity, strong in anti-interference capability and high in metering precision.
In order to achieve the technical purpose and meet the technical requirements, the invention adopts the technical scheme that: an anti-interference integrated sensor, comprising:
The periphery of the casting body is wrapped with a rubber layer;
the hoisting piece is arranged in the casting body and is made of insulating materials;
a current winding arranged on the hoisting piece;
the high-voltage shielding element is inserted into the casting body and is coaxially arranged with the current winding;
The current-voltage conversion element is arranged in the pouring cavity and is electrically connected with the current winding and used for converting the phase zero sequence current into a phase zero sequence voltage small signal;
The voltage dividing element is arranged in the pouring cavity and is electrically connected with the high-voltage shielding element;
The cavity is arranged at the bottom of the casting body;
And the compensating capacitance error adjusting element is arranged in the cavity and is electrically connected with the voltage dividing element.
As the preferable technical scheme, the hoisting piece comprises a connecting part and a hoisting part arranged at the lower end of the connecting part, the hoisting part is of an arc-shaped structure, the arc-shaped structure is matched with the appearance of the current winding, two ends of the surface of the hoisting part, which deviate from the current winding, are respectively provided with 1 limiting groove for limiting the binding belt, and the current winding is bound on the hoisting part through the binding belt.
As the preferable technical scheme, the high-voltage shielding element comprises an epoxy pipe, a shielding cylinder sleeved on the epoxy pipe, a left shielding ring and a right shielding ring which are respectively arranged at the left side and the right side of the shielding cylinder, a copper contact arranged at the left side of the epoxy pipe, a copper lug hung on the copper contact, a high-voltage outgoing line hung on the copper lug, and an electric connecting bolt arranged at the free end of the high-voltage outgoing line.
As the preferable technical scheme, the voltage dividing element comprises a voltage dividing PCB, a plurality of high-voltage arm capacitors arranged on two sides of the length direction of the voltage dividing PCB at intervals, a high-voltage insert arranged at the upper end of the voltage dividing PCB, a low-voltage arm capacitor arranged at the lower part of the voltage dividing PCB, a low-voltage arm capacitor positive end arranged at the lower part of the voltage dividing PCB, a low-voltage arm capacitor negative end arranged at the lower part of the voltage dividing PCB, a through groove arranged at the lower part of the voltage dividing PCB, a positive-end low-voltage insert arranged at the bottom end of the voltage dividing PCB and a negative-end low-voltage insert arranged between the positive end of the low-voltage arm capacitor and the negative end of the low-voltage arm capacitor, wherein the positive-end low-voltage insert is electrically connected with the positive end of the low-voltage arm capacitor, and the negative end low-voltage insert is electrically connected with the high-voltage shielding element.
As the preferable technical scheme, the compensating capacitance error adjusting element comprises a capacitance error adjusting PCB board, a shielding cable positive electrode connecting point, a shielding cable negative electrode connecting point, 2 parallel compensating capacitors, a capacitance error adjusting positive electrode connecting terminal, a capacitance error adjusting negative electrode connecting terminal, a positive shielding cable and a negative shielding cable, wherein the capacitance error adjusting positive electrode connecting terminal is electrically connected with the shielding cable positive electrode connecting point, the capacitance error adjusting negative electrode connecting terminal is electrically connected with the shielding cable negative electrode connecting point, the capacitance error adjusting positive electrode connecting terminal is electrically connected with the positive end low-voltage insert, and the capacitance error adjusting negative electrode connecting terminal is electrically connected with the negative end low-voltage insert.
As an optimal technical scheme, a plurality of groups of through holes are linearly and uniformly formed in the hoisting part in a penetrating mode.
As an preferable technical scheme, 2 connection copper columns are arranged between the voltage dividing element and the compensation capacitance error adjusting element, the capacitance error adjusting positive end connecting terminal is electrically connected with the positive end low voltage insert through 1 connection copper column, and the capacitance error adjusting negative end connecting terminal is electrically connected with the negative end low voltage insert through the other 1 connection copper column.
As the preferable technical scheme, the hoisting piece is made of nylon.
As an optimal technical scheme, the high-voltage arm capacitor and the low-voltage arm capacitor are of a composite membrane structure.
The invention also discloses a manufacturing method of the anti-interference integrated sensor, which is characterized by comprising the following steps of:
binding the current to the hoisting piece in a winding manner, and fixing the hoisting piece;
The high-voltage shielding element is arranged in the center of the current winding in a penetrating way, so that concentricity of the high-voltage shielding element and the current winding is ensured;
the current-voltage conversion element and the voltage dividing element are connected, the current-voltage conversion element is connected with the current winding, the voltage dividing element is connected with the high-voltage shielding element, and the hoisting piece, the current winding, the high-voltage shielding element, the current-voltage conversion element and the voltage dividing element are all arranged in a closed casting mould;
Injecting epoxy material into the casting mold for casting, forming a casting body after the epoxy material is solidified, forming a cavity at the lower part of the casting body 1, and forming a mounting hole at the upper part of the casting body;
Polishing and cleaning the surface of the casting body, inserting a lower die head into the cavity, inserting a left die head into the left side of the mounting hole, inserting a right die head into the right side of the mounting hole, and coating an adhesive on the surface of the casting body;
The casting body is arranged on a lower die, so that the casting body is matched with a lower die cavity on the lower die, a rotary handle is arranged on the die frame, the rotary handle is operated to prop against the lower die head to fix the casting body, then an upper die is arranged, so that the upper die is matched with the lower die in a sealing way, and a complete die cavity is formed between the upper die and the lower die;
Preheating and plasticizing a rubber raw material, then injecting the rubber raw material into a die cavity so that the rubber raw material is wrapped on the periphery of a casting body, and solidifying to form a rubber layer;
Performing molding vulcanization at a given temperature, and finally opening an upper die and a lower die to take out the sensors;
Installing a compensation capacitance error regulating element in the cavity, electrically connecting the compensation capacitance error regulating element with the voltage dividing element and the current-voltage converting element, leading out a cable, injecting low-voltage epoxy material into the cavity, sealing the compensation capacitance error regulating element in the cavity, and isolating the current-voltage converting element and the voltage dividing element from the compensation capacitance error regulating element;
and a lower cover with a lead tube is arranged at the bottom of the cavity.
The beneficial effects of the invention are as follows:
1) The voltage sensor and the current sensor are integrated, the high-voltage shielding element passes through the current winding, interference can be shielded, the current-voltage conversion element converts current into voltage, the voltage dividing element converts high voltage into low voltage, the compensation capacitance error adjusting element carries out error adjustment on the low voltage so as to obtain more accurate voltage signals, so that the measurement accuracy of the sensor can be greatly improved, and the cavity separates the voltage dividing element from the compensation capacitance error adjusting element to prevent mutual interference;
2) Preferably, the appearance of the hoisting part is matched with that of the current winding, the current winding fixing column can be well matched with the appearance of the current winding, the insulating effect is realized, the concentricity of the current winding and the high-voltage shielding element is ensured, the shielding field is more uniform, the shielding effect is better, the current winding is not easy to damage because the current winding is bound to the hoisting part, the installation and the disassembly are convenient, and further preferably, epoxy materials enter from the through holes, so that the current winding and the hoisting part can be fully wrapped, air bubbles are avoided, and the integral performance is influenced;
3) Preferably, the shielding cylinder, the left shielding ring and the right shielding ring form a larger shielding area, the shielding effect is good, the interference of high voltage on each element is prevented, and the output signal is more stable and accurate;
4) Preferably, the positive shielding cable and the negative shielding cable in the compensation capacitance adjusting element can be used for uniformly electric fields on the outer surface of the core wire on one hand, and equipotential the inner shielding and the core wire on the other hand, so that the capacitive leakage of the core wire to the inner shielding is eliminated, and the influence of parasitic capacitance is overcome;
5) Preferably, the connecting copper column has good supporting property and good conductive effect;
6) Preferably, the high-voltage arm capacitor adopts a composite film structure, the main capacitor can reach more than 600pF, and the high-voltage arm capacitor has the advantages of large signal, no heating, strong anti-interference performance and good long-term stability, and the low-voltage arm capacitor and the high-voltage arm capacitor adopt the same structure and the same epoxy material for integrated glue filling, so that the high-voltage and low-voltage capacitors are ensured to have approximately equal temperature coefficients, and the purpose of improving the product precision is achieved;
7) The casting body is integrally molded by rubber injection, so that the traditional manual silicon rubber coating mode is broken, no adhesive joint exists, the insulating property is better, and the manufactured sensor is excellent in mechanical property and electrical property, strong in anti-interference capability and high in metering precision.
Drawings
FIG. 1 is a block diagram of a sensor according to one embodiment of the present invention;
fig. 2 is a block diagram of a high voltage shielding element according to an embodiment of the present invention;
FIG. 3 is a block diagram of a voltage dividing element according to an embodiment of the present invention;
FIG. 4 is a block diagram of a compensation capacitance error adjustment element according to one embodiment of the present invention;
FIG. 5 is a front view of a sling according to one embodiment of the present invention;
FIG. 6 is a top view of FIG. 5;
fig. 7 is a diagram of sensor rubber casting according to an embodiment of the present invention.
In fig. 1-7, 1, a casting body; 101. a cavity; 102. a mounting hole; 2. a rubber layer; 3. hoisting the piece; 301. a connection part; 302. a hoisting part; 3021. a limit groove; 3022. a through hole; 4. a current winding; 5. a high voltage shielding element; 501. an epoxy tube; 502. a shielding cylinder; 503. a left shield ring; 504. a right shield ring; 505. copper contacts; 506. copper lugs; 507. a high-voltage outgoing line; 508. an electric connecting bolt; 6. a current-voltage conversion element; 7. a voltage dividing element; 701. a voltage dividing PCB board; 7011. trough passing; 702. a high voltage arm capacitor; 703. a high pressure insert; 704. a low voltage arm capacitance; 705. the positive end of the low-voltage arm capacitor; 706. a negative end of the low-voltage arm capacitor; 707. a positive low pressure insert; 708. a negative side low pressure insert; 8. a compensation capacitance error adjustment element; 801. capacitance error adjusting PCB board; 802. the positive electrode connection point of the shielded cable; 803. a shielded cable negative electrode connection point; 804. a compensation capacitor; 805. a capacitance error adjustment positive terminal; 806. a capacitance error adjusting negative terminal connecting terminal; 807. trimming the capacitor; 9. connecting copper columns; 901. an upper connection end; 902. a lower connection hole; 10. a lower cover; 11. a lead tube; 12. a flat screw; 13. a mould frame; 14. a lower die; 1401. a lower die cavity; 15. a left die head; 16. a right die head; 17. a lower die head; 18. rotating the handle; 19. and (5) fastening a screw.
Detailed Description
The invention is further described below with reference to the accompanying drawings.
Referring to fig. 1-7, the invention provides an anti-interference integrated sensor, which comprises a casting body 1, a hoisting piece 3 arranged in the casting body 1, a current winding 4 arranged on the hoisting piece 3, a high-voltage shielding element 5 inserted on the casting body 1, a current-voltage conversion element 6 arranged in a casting cavity, a voltage dividing element 7 arranged in the casting cavity, a cavity 101 arranged at the bottom of the casting body 1 and a compensation capacitance error adjusting element 8 arranged in the cavity 101, wherein a rubber layer 2 is wrapped on the periphery of the casting body 1, the hoisting piece 3 is made of insulating materials, the high-voltage shielding element 5 and the current winding 4 are coaxially arranged, the current-voltage conversion element 6 and the current winding 4 are electrically connected and are used for converting zero sequence current into phase zero sequence voltage small signals, the voltage dividing element 7 and the high-voltage shielding element 5 are electrically connected, and the compensation capacitance error adjusting element 8 and the voltage dividing element 7 are electrically connected.
The voltage dividing element 7 is vertically arranged and is positioned below the current winding 4, the bottom end of the voltage dividing element 7 is in contact with the upper outer wall of the cavity 101, and the current-voltage conversion element 6 is positioned at the wire outlet end of the current winding 4 and is connected, so that the whole structure is simple and compact, and the space of the casting body 1 is reasonably utilized.
The sensor is an integrated sensor of a current sensor and a voltage sensor, the cavity 101 isolates the compensation capacitance error adjusting element 8 from the voltage dividing element 7 to prevent mutual interference, the high-voltage shielding element 5 passes through the current winding 4 and can shield high voltage to prevent the high voltage from interfering signals, the voltage dividing element 7 converts the high voltage into a weak voltage signal, and the compensation capacitance error adjusting element 8 carries out error adjustment on the low voltage to obtain more accurate voltage signals, so that the metering accuracy of the voltage sensor can be greatly improved.
The current winding 4 is connected with the current-voltage conversion element 6 in parallel at the wire outlet end, the phase zero sequence current is directly converted into the phase zero sequence voltage small signal, the current-voltage conversion element 6 is made of alloy foil resistance material, the lead-out end of the current-voltage conversion element is connected with an antioxidant tinned copper wire, 96% alumina ceramic chip is adopted for packaging, the current-voltage conversion element has a smaller temperature coefficient, so that the current-voltage conversion element has better heat dissipation performance, the whole noninductive design is realized, the resistance can meet the 0.1% precision requirement, the current-voltage conversion element has low temperature coefficient and super-strong pulse tolerance capability, is anti-interference, has extremely low inductance resistance, has load stability reaching 0.02%, and indirectly ensures and improves the metering precision of the current sensor.
As shown in fig. 1-7, the hoisting member 3 includes a connection portion 301, and a hoisting portion 302 disposed at the lower end of the connection portion 301, where the hoisting portion 302 is of an arc structure, the arc structure is matched with the appearance of the current winding 4, two ends of the surface of the hoisting portion 302, which is away from the current winding 4, are respectively provided with 1 limiting groove 3021 for limiting a binding belt, the current winding 4 is bound on the hoisting portion 302 by a binding belt, the limiting grooves 3021 prevent the binding belt from shifting, and the hoisting portion 302 is matched with and fixed to the current winding 4, so that concentricity of the high-voltage shielding element 5 and the current winding 4 can be controlled, the shielding field is more uniform, the shielding effect is better, and meanwhile, the installation mode is softer, and the current winding 4 cannot be damaged.
Further, the hoisting portion 302 is provided with a plurality of groups of through holes 3022 in a linear and uniform penetrating manner, and epoxy enters from the through holes 3022, so that the current winding 4 and the hoisting portion 302 can be fully wrapped, bubbles are prevented from being generated, and the overall performance is affected.
As shown in fig. 1 to 7, the high voltage shielding element 5 includes an epoxy pipe 501, a shielding cylinder 502 sleeved on the epoxy pipe 501, a left shielding ring 503 and a right shielding ring 504 respectively arranged on the left side and the right side of the shielding cylinder 502, a copper contact 505 arranged on the left side of the epoxy pipe 501, a copper lug 506 hung on the copper contact 505, a high voltage outgoing line 507 hung on the copper lug 506, and an electric connection bolt 508 arranged on the free end of the high voltage outgoing line 507, wherein the shielding cylinder 502, the left shielding ring 503 and the right shielding ring 504 form a larger shielding area to prevent high voltage interference and improve the stability of signal output.
As shown in fig. 1 to 7, the voltage dividing element 7 includes a voltage dividing PCB 701, a plurality of high voltage arm capacitors 702 arranged in parallel at intervals on both sides of the length direction of the voltage dividing PCB 701, a high voltage insert 703 arranged at the upper end of the voltage dividing PCB 701, a low voltage arm capacitor 704 arranged at the lower part of the voltage dividing PCB 701, a low voltage arm capacitor positive end 705 arranged at the lower part of the voltage dividing PCB 701, a low voltage arm capacitor negative end 706 arranged at the lower part of the voltage dividing PCB 701, a through slot 7011 arranged at the lower part of the voltage dividing PCB 701, a positive end low voltage insert 707 and a negative end low voltage insert 708 arranged at the bottom end of the voltage dividing PCB 701, the through slot 7011 being located between the low voltage arm capacitor positive end 705 and the low voltage arm capacitor negative end 706, the positive end low voltage insert 707 being electrically connected to the low voltage arm capacitor positive end 705, the negative end low voltage insert 708 being electrically connected to the low voltage arm capacitor negative end 706, and the high voltage shielding element 5.
The voltage dividing element 7 adopts a capacitance dividing structure, a plurality of high voltage arm capacitors 702 are connected in series through a voltage dividing PCB 701 to obtain weak voltage signal output, a high voltage insert 703 at the upper end of the voltage dividing PCB 701 is connected with an electric connection bolt 508 on a high voltage outgoing line 507, a main body part is connected in series through the plurality of high voltage arm capacitors 702, an outgoing line is divided into 2 circuits, one circuit is used as the negative end of the high voltage arm capacitor 702, the other circuit is continuously connected in series with a low voltage arm capacitor 704, and the voltage dividing element 7 finally has 2 outgoing line terminals, namely the negative end of the high voltage arm capacitor 702 (also used as the positive end 705 of the low voltage arm capacitor) and the negative end 706 of the low voltage arm capacitor.
Further, the high-voltage arm capacitor 702 and the low-voltage arm capacitor 704 are of composite film structures, the main capacitor can reach more than 600pF, and the high-voltage arm capacitor has the advantages of large signal, no heating, strong anti-interference performance and good long-term stability; the low-voltage arm capacitor 704 and the high-voltage arm capacitor 702 adopt the same structure and the same epoxy material for integrated glue filling, so that the high-voltage and low-voltage capacitors are guaranteed to have approximately equal temperature coefficients, and the purpose of improving the product precision is achieved.
As shown in fig. 1-7, the compensation capacitance error adjusting element 8 includes a capacitance error adjusting PCB 801, a shielded cable positive connection point 802, a shielded cable negative connection point 803, 2 parallel compensation capacitances 804, a capacitance error adjusting positive connection terminal 805, a capacitance error adjusting negative connection terminal 806, a positive shielded cable, a negative shielded cable, the capacitance error adjusting positive connection terminal 805 electrically connected to the shielded cable positive connection point 802, the capacitance error adjusting negative connection terminal 806 electrically connected to the shielded cable negative connection point 803, the capacitance error adjusting positive connection terminal 805 electrically connected to the positive low voltage insert 707, and the capacitance error adjusting negative connection terminal 806 electrically connected to the negative low voltage insert 708.
The compensating capacitance error adjusting element 8 is arranged in the cavity 101, a plurality of compensating capacitances 804 with different capacitance values are processed into an integrated circuit chip through the capacitance error adjusting PCB 801, initial states of the compensating capacitances 804 in the circuit are in open circuit and are connected in parallel with each other, the compensating capacitances are connected with the negative end of the high-voltage arm capacitance 702 and the negative end 706 of the low-voltage arm capacitance, the adjustable error percentage is recorded beside each compensating capacitance 804, the corresponding compensating capacitance 804 is selected according to the product error percentage deviation value, a plurality of fine tuning capacitances 807 are arranged on the capacitance error adjusting PCB 801, the adjusting error accuracy is higher, errors are further reduced, the capacitance is selected according to the product errors during error measurement, and then the solder of the compensating capacitance 804 corresponding to the electric soldering iron melting device is used for controlling the error accuracy operation of the product to be in a channel state.
The leading-out end of the current-voltage conversion element 6 is connected with a high-temperature shielding cable, a lower cover 10 is arranged on the bottom surface of the casting body 1 by using a fastening screw 19, a leading-out tube 11 is arranged on the lower cover 10 and used for leading out each cable, and the leading-out tube 11 is connected with a switch breaker shell.
As shown in fig. 1 to 7, 2 connection copper pillars 9 are disposed between the voltage dividing element 7 and the compensation capacitance error adjusting element 8, the capacitance error adjusting positive end connection terminal is electrically connected with the positive end low voltage insert 707 through 1 connection copper pillar 9, the capacitance error adjusting negative end connection terminal is electrically connected with the negative end low voltage insert 708 through another 1 connection copper pillar 9, and the connection copper pillar 9 has good supporting performance and good conductive effect.
Specifically, the upper end of each connection copper column 9 is provided with 1 upper connection end 901,2 upper connection ends 901 respectively in threaded connection with the positive-end low-voltage insert 707 and the negative-end low-voltage insert 708, the lower end of each connection copper column 9 is provided with 1 lower connection hole 902,2 lower connection holes 902 respectively corresponding to the capacitance error adjustment positive-end connection terminal 805 and the capacitance error adjustment negative-end connection terminal 806, and flat screws 12 are arranged in the lower connection holes 902 for connection and fixation.
As shown in fig. 1 to 7, the hoisting member 3 is made of nylon, and has light weight, good strength and good insulation.
The sensor is of a current and voltage integrated structure, is mainly matched with a ZW32 type outdoor pole-mounted switch breaker of a 10kV system, and has the functions of collecting phase current, zero sequence current and zero sequence voltage signals.
Current part working principle:
The current winding 4 adopts the low-power current coil principle, the secondary output is a voltage signal, the current winding 4 comprises a primary winding small iron core and a secondary winding with extremely small loss, the secondary winding is connected with a current-voltage conversion element 6 which can be expressed as Ra, the voltage drop Us generated by the secondary current I 2 on Ra is proportional to the primary current I 1 and has the same phase, and the smaller the internal loss of the transformer and the secondary power required by the load are, the wider the measuring range is, and the higher the accuracy is.
Principle of operation of the voltage part:
the voltage part adopts the principle of capacitive voltage division, divides the capacitor string into a main capacitor C1 and a voltage division capacitor C2, and the voltage UC2 on the primary side is set as U1, and then the voltage UC2 on the C2 is as follows:
UC2＝C1/(C1+C2)U1
by changing the ratio of C1 to C2, different voltage division ratios can be obtained, and since UC2 is in direct proportion to primary voltage U1, U1 can be obtained by measuring UC2, which is the working principle of capacitive voltage division.
Sensor structure:
The sensor is of a combined structure of a current transformer and a voltage transformer, the phase zero sequence current transformer and the zero sequence voltage transformer are respectively of three-phase independent type, each phase of product adopts an epoxy and silicone rubber integrated composite process injection structure, copper contacts of an internal high-voltage shielding element are connected, a high-voltage outgoing line 507 is connected with the copper contacts, and a main loop penetrates a phi 20 copper rod at a high-voltage end of a circuit breaker into a primary epoxy pipe of the product; the secondary outgoing line is led out from the lower part of the product, the lead pipe is a 304 stainless steel seamless bent pipe, and two ends of the lead pipe are in threaded connection for fixing the transformer and the switch breaker shell.
Referring to fig. 1-7, the invention also discloses a manufacturing method of the anti-interference integrated sensor, which comprises the following steps:
step 1, binding a current winding 4 onto a hoisting piece 3, and fixing the hoisting piece 3;
Step 2, penetrating the high-voltage shielding element 5 in the center of the current winding 4, so as to ensure concentricity of the high-voltage shielding element 5 and the current winding 4;
step 3, connecting the current-voltage conversion element 6 and the voltage dividing element 7, connecting the current-voltage conversion element 6 with the current winding 4, connecting the voltage dividing element 7 with the high-voltage shielding element 5, and installing the hoisting piece 3, the current winding 4, the high-voltage shielding element 5, the current-voltage conversion element 6 and the voltage dividing element 7 in a closed casting mold;
Step 4, injecting epoxy material into a casting mold for casting, forming a casting body 1 after the epoxy material is solidified, forming a cavity 101 at the lower part of the casting body 1, forming a mounting hole 102 at the upper part of the casting body 1, wherein the casting mold adopts a conventional technical scheme, and then forming the cavity 101 at the lower part, and the casting mold is not shown in the drawing;
Step 5, polishing and cleaning the surface of the casting body 1, inserting a lower die head 17 into the cavity 101, inserting a left die head 15 into the left side of the mounting hole 102, inserting a right die head 16 into the right side of the mounting hole 102, and then coating an adhesive on the surface of the casting body 1;
Step 6, mounting the casting body 1 on the lower die 14, so that the casting body 1 is matched with a lower die cavity 1401 on the lower die 14, arranging a rotary handle 18 on the die frame 13, operating the rotary handle 18 to prop against the lower die 17 to fix the casting body 1, mounting an upper die, so that the upper die is in sealed fit with the lower die 14, forming a complete die cavity with the upper die and the lower die 14, respectively arranging 1 rod part on the left die 15, the right die 16 and the lower die 17, forming a rectangular frame structure on the die frame 13, respectively supporting each rod part by four sides, and respectively arranging 1 sliding groove on four sides, so that the rod parts slide in the sliding grooves, and the upper die is similar to the lower die 14 in structure and is not shown in the drawing;
Step 7, preheating and plasticizing the rubber raw material, then injecting the rubber raw material into a die cavity so that the rubber raw material is wrapped on the periphery side of a casting body 1, and forming a rubber layer 2 after solidification;
The lower die 14 is generally provided with 2 symmetrical lower die cavities 1401, and correspondingly, the upper die is also provided with 2 symmetrical upper die cavities, so that the 2 lower die cavities 1401 are respectively provided with 1 casting body 1,2 casting bodies 1 are symmetrically arranged, 2 casting bodies 1 can be cast simultaneously, the processing efficiency is obviously improved, the traditional manual silicone rubber coating mode is broken, no bonding seam exists, and the insulating performance is more advantageous;
Step 8, performing molding vulcanization at a given temperature, and finally opening an upper die and a lower die 14 to take out the sensor, thereby completing the whole injection molding vulcanization process;
step 9, installing a compensation capacitance error regulating element 8 in the cavity 101, electrically connecting the compensation capacitance error regulating element 8 with the voltage dividing element 7 and the current-voltage converting element 6, leading out a cable, injecting low-voltage epoxy material, sealing the compensation capacitance error regulating element 8 in the cavity 101, isolating the current converting element 6 and the voltage dividing element 7 from the compensation capacitance error regulating element 8, and preventing the current converting element 6 and the voltage dividing element 7 from interfering the compensation capacitance error regulating element 8 when working, wherein the error regulating precision of the compensation capacitance error regulating element 8 is higher;
step 10, a lower cover 10 with a lead tube 11 is installed at the bottom of the cavity 101, and generally, a bolt installation mode is adopted, so that the disassembly and assembly are convenient.
The above examples are provided for the purpose of clearly illustrating the invention and are not to be construed as limiting the invention, and other variants and modifications of the various forms may be made by those skilled in the art based on the description, which are not intended to be exhaustive of all embodiments, and obvious variants or modifications of the invention may be found within the scope of the invention.
Claims (9)
1. An anti-interference integrated sensor, comprising:
The periphery of the casting body is wrapped with a rubber layer;
the hoisting piece is arranged in the casting body and is made of insulating materials;
a current winding arranged on the hoisting piece;
the high-voltage shielding element is inserted into the casting body and is coaxially arranged with the current winding;
The current-voltage conversion element is arranged in the casting body and is electrically connected with the current winding and used for converting the phase zero sequence current into a phase zero sequence voltage small signal;
the voltage dividing element is arranged in the casting body and is electrically connected with the high-voltage shielding element;
The cavity is arranged at the bottom of the casting body;
The compensating capacitance error adjusting element is arranged in the cavity and is electrically connected with the voltage dividing element;
the compensating capacitance error adjusting element comprises a capacitance error adjusting PCB board, a shielding cable positive electrode connecting point, a shielding cable negative electrode connecting point, 2 parallel compensating capacitors, a capacitance error adjusting positive electrode connecting terminal, a capacitance error adjusting negative electrode connecting terminal, a positive shielding cable and a negative shielding cable, wherein the capacitance error adjusting positive electrode connecting terminal is electrically connected with the shielding cable positive electrode connecting point, the capacitance error adjusting negative electrode connecting terminal is electrically connected with the shielding cable negative electrode connecting point, the capacitance error adjusting positive electrode connecting terminal is electrically connected with the positive electrode low-voltage insert, and the capacitance error adjusting negative electrode connecting terminal is electrically connected with the negative electrode low-voltage insert.
2. The anti-interference integrated sensor according to claim 1, wherein the lifting piece comprises a connecting portion and a lifting portion arranged at the lower end of the connecting portion, the lifting portion is of an arc-shaped structure, the arc-shaped structure is matched with the appearance of the current winding, two ends of the surface of the lifting portion, which deviate from the current winding, are respectively provided with 1 limiting groove for limiting a binding belt, and the current winding is bound on the lifting portion through the binding belt.
3. The anti-interference integrated sensor according to claim 1, wherein the high-voltage shielding element comprises an epoxy pipe, a shielding cylinder sleeved on the epoxy pipe, a left shielding ring and a right shielding ring respectively arranged on the left side and the right side of the shielding cylinder, a copper contact arranged on the left side of the epoxy pipe, a copper lug hung on the copper contact, a high-voltage outgoing line hung on the copper lug, and an electric connecting bolt arranged at the free end of the high-voltage outgoing line.
4. The anti-interference integrated sensor according to claim 1, wherein the voltage dividing element comprises a voltage dividing PCB, a plurality of high-voltage arm capacitors arranged at one side of the length direction of the voltage dividing PCB in parallel, a high-voltage insert arranged at the upper end of the voltage dividing PCB, a low-voltage arm capacitor arranged at the lower part of the voltage dividing PCB, a positive end of the low-voltage arm capacitor arranged at the lower part of the voltage dividing PCB, a negative end of the low-voltage arm capacitor arranged at the lower part of the voltage dividing PCB, a through slot arranged at the lower part of the voltage dividing PCB, a positive end low-voltage insert arranged at the bottom end of the voltage dividing PCB and a negative end low-voltage insert arranged between the positive end of the low-voltage arm capacitor and the negative end of the low-voltage arm capacitor, wherein the positive end low-voltage insert is electrically connected with the positive end of the low-voltage arm capacitor, the negative end low-voltage insert is electrically connected with the negative end of the low-voltage arm capacitor, and the high-voltage insert is electrically connected with the high-voltage shielding element.
5. The anti-interference integrated sensor according to claim 2, wherein a plurality of groups of through holes are linearly and uniformly formed in the lifting part.
6. The tamper resistant integrated sensor of claim 1, wherein 2 copper connection posts are disposed between said voltage divider element and said compensating capacitance error adjustment element, said capacitance error adjustment positive terminal is electrically connected to said positive low voltage insert through 1 of said copper connection posts, and said capacitance error adjustment negative terminal is electrically connected to said negative low voltage insert through another 1 of said copper connection posts.
7. The anti-interference integrated sensor according to claim 1, wherein the hanging piece is made of nylon.
8. The tamper resistant integrated sensor of claim 4, wherein said high voltage arm capacitor and low voltage arm capacitor are of a composite membrane construction.
9. A method of manufacturing an integrated sensor of any one of claims 1-8, comprising the steps of:
binding the current winding to a lifting piece, and fixing the lifting piece;
The high-voltage shielding element is arranged in the center of the current winding in a penetrating way, so that concentricity of the high-voltage shielding element and the current winding is ensured;
the current-voltage conversion element and the voltage dividing element are connected, the current-voltage conversion element is connected with the current winding, the voltage dividing element is connected with the high-voltage shielding element, and the hoisting piece, the current winding, the high-voltage shielding element, the current-voltage conversion element and the voltage dividing element are all arranged in a closed casting mould;
Injecting epoxy material into the casting mold for casting, forming a casting body after the epoxy material is solidified, forming a cavity at the lower part of the casting body 1, and forming a mounting hole at the upper part of the casting body;
Polishing and cleaning the surface of the casting body, inserting a lower die head into the cavity, inserting a left die head into the left side of the mounting hole, inserting a right die head into the right side of the mounting hole, and coating an adhesive on the surface of the casting body;
The casting body is arranged on a lower die, so that the casting body is matched with a lower die cavity on the lower die, a rotary handle is arranged on a die frame, the rotary handle is operated to prop against the lower die head to fix the casting body, then an upper die is arranged, so that the upper die is matched with the lower die in a sealing way, and a complete die cavity is formed between the upper die and the lower die;
Preheating and plasticizing a rubber raw material, then injecting the rubber raw material into a die cavity so that the rubber raw material is wrapped on the periphery of a casting body, and solidifying to form a rubber layer;
Performing molding vulcanization at a given temperature, and finally opening an upper die and a lower die to take out the sensors;
Installing a compensation capacitance error regulating element in the cavity, electrically connecting the compensation capacitance error regulating element with the voltage dividing element and the current-voltage converting element, leading out a cable, injecting low-voltage epoxy material into the cavity, sealing the compensation capacitance error regulating element in the cavity, and isolating the current-voltage converting element and the voltage dividing element from the compensation capacitance error regulating element;
and a lower cover with a lead tube is arranged at the bottom of the cavity.
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Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104330761A (en) * | 2014-11-14 | 2015-02-04 | 国家电网公司 | Standard voltage ratio device for online error correction for voltage transformer and operation method |
| CN109188042A (en) * | 2018-07-13 | 2019-01-11 | 北京和信瑞通电力技术股份有限公司 | A kind of distribution one or two times fusions three-phase thin-film capacitor divided voltage sensor |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN203607237U (en) * | 2013-11-28 | 2014-05-21 | 苏州九正电工有限公司 | Current transformer test device of generator wire outlet casing |
| US9739807B2 (en) * | 2015-08-05 | 2017-08-22 | Schneider Electric USA, Inc. | Voltage sensor with a capacitive voltage transformer |
| CA3063358A1 (en) * | 2017-05-17 | 2018-11-22 | 3M Innovative Properties Company | Sensors with discrete capacitors for high voltage separable connectors |
| CN115508608A (en) * | 2021-11-10 | 2022-12-23 | 浙江华采科技有限公司 | High-voltage and current combined sensor integrated with capacitive power supply |
| CN219213831U (en) * | 2023-02-14 | 2023-06-20 | 登高电气有限公司 | Pouring mould of combined transformer |
| CN219369860U (en) * | 2023-03-06 | 2023-07-18 | 珠海立潮电力科技有限公司 | ZW32 electronic voltage and current combined sensor |
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Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104330761A (en) * | 2014-11-14 | 2015-02-04 | 国家电网公司 | Standard voltage ratio device for online error correction for voltage transformer and operation method |
| CN109188042A (en) * | 2018-07-13 | 2019-01-11 | 北京和信瑞通电力技术股份有限公司 | A kind of distribution one or two times fusions three-phase thin-film capacitor divided voltage sensor |
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