CN108710020B - Energy-taking and measuring capacitive dual voltage sensor for power distribution equipment - Google Patents
Energy-taking and measuring capacitive dual voltage sensor for power distribution equipment Download PDFInfo
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- CN108710020B CN108710020B CN201810933521.0A CN201810933521A CN108710020B CN 108710020 B CN108710020 B CN 108710020B CN 201810933521 A CN201810933521 A CN 201810933521A CN 108710020 B CN108710020 B CN 108710020B
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- 230000009977 dual effect Effects 0.000 title claims abstract description 14
- 239000003990 capacitor Substances 0.000 claims abstract description 78
- 239000004743 Polypropylene Substances 0.000 claims abstract description 66
- -1 polypropylene Polymers 0.000 claims abstract description 66
- 229920001155 polypropylene Polymers 0.000 claims abstract description 66
- 229920002379 silicone rubber Polymers 0.000 claims abstract description 26
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 claims abstract description 19
- 229910052782 aluminium Inorganic materials 0.000 claims abstract description 19
- 239000004945 silicone rubber Substances 0.000 claims abstract description 16
- 238000005259 measurement Methods 0.000 claims abstract description 14
- 239000000203 mixture Substances 0.000 claims abstract description 12
- 239000004593 Epoxy Substances 0.000 claims abstract description 9
- 239000000463 material Substances 0.000 claims description 8
- 238000000819 phase cycle Methods 0.000 claims description 6
- 230000010354 integration Effects 0.000 claims description 2
- 238000009434 installation Methods 0.000 abstract description 7
- 238000004519 manufacturing process Methods 0.000 abstract description 7
- 238000000034 method Methods 0.000 abstract description 4
- 238000007789 sealing Methods 0.000 abstract description 2
- 238000005070 sampling Methods 0.000 description 8
- 230000000694 effects Effects 0.000 description 5
- 239000003822 epoxy resin Substances 0.000 description 4
- 229920000647 polyepoxide Polymers 0.000 description 4
- 238000011161 development Methods 0.000 description 3
- 230000005672 electromagnetic field Effects 0.000 description 3
- 238000012423 maintenance Methods 0.000 description 3
- 230000009286 beneficial effect Effects 0.000 description 2
- 238000006243 chemical reaction Methods 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 238000007599 discharging Methods 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 230000004927 fusion Effects 0.000 description 2
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- 230000004048 modification Effects 0.000 description 2
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- 241000282414 Homo sapiens Species 0.000 description 1
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- 239000000428 dust Substances 0.000 description 1
- 238000005265 energy consumption Methods 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
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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
- G01R19/0084—Arrangements for measuring currents or voltages or for indicating presence or sign thereof measuring voltage only
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- General Physics & Mathematics (AREA)
- Measuring Instrument Details And Bridges, And Automatic Balancing Devices (AREA)
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Abstract
The energy-taking and measuring capacitance type dual voltage sensor for the power distribution equipment comprises a phase-zero sequence integrated sensor, wherein a high-voltage end insert is arranged at the upper end of a silicone rubber jacket, a high-voltage end polypropylene capacitor is arranged in the silicone rubber jacket, energy-taking secondary polypropylene capacitors are arranged on two sides of the polypropylene capacitor, and an inductance element is arranged at the lower end of the polypropylene capacitor; a measuring signal output transformer is arranged in the aluminum seat, and two measuring secondary polypropylene capacitors are symmetrically arranged below the measuring signal output transformer; the epoxy mixture arranged in the silicone rubber jacket is used for integrally sealing and insulating the energy-taking secondary polypropylene capacitor, the inductance element, the measuring signal output transformer and the measuring secondary polypropylene capacitor; the invention has simple structure, convenient operation, light weight and small volume, and can independently finish installation and debugging by one person, thereby reducing the cost and improving the production efficiency; collect energy taking and measurement, have dual function; the method is widely applicable to outdoor distribution network systems.
Description
Technical Field
The invention relates to the field of automatic sampling control of distribution networks, in particular to an energy taking and measuring capacitor type dual voltage sensor for distribution equipment.
Background
With the rapid development of electronic technology, a microcomputer type relay protection device gradually takes the dominant position, and in relay protection and measurement, the energy flow and the information flow of a control part are separated, so that the monitoring equipment does not need high-power output sensor sampling any more; meanwhile, due to the rapid development of the power industry and more complex power grid conditions, the intelligent current-voltage transformer for improving the power factor and the power grid quality is widely applied; the traditional energy taking and measuring sensor adopts a three-phase five-column type mutual inductor, the weight of the three-phase five-column type mutual inductor is about 125kg, the weight and the volume are large, and one person cannot move or independently complete the installation; the structure is complex, and the overhaul is difficult; therefore, in order to meet the requirement of fine management of the line loss of a national power grid, new requirements are required to be put forward for a voltage sensor of primary equipment to meet the requirement of metering precision, a capacitive dual-type voltage sensor for energy taking and measuring of power distribution equipment is developed, voltage acquisition signals can be provided for an FTU/DTU (power distribution terminal unit), and the multifunctional integrated three-phase intelligent voltage sensor with voltage sampling, measuring, protecting, zero sequence and discharging is urgent.
Disclosure of Invention
The invention aims to provide an energy-taking and measuring capacitive dual voltage sensor for power distribution equipment, which has the advantages of simple structure, low cost, light weight, small volume and easiness in installation, and solves the technical problems.
In order to achieve the technical purpose and meet the technical requirements, the invention adopts the technical scheme that: energy-taking and measuring capacitive dual voltage sensor for power distribution equipment, comprising a mounting base, and characterized in that: the mounting base is arranged in a convex shape, and a plurality of kidney-shaped mounting holes are formed in two sides of the long side of the mounting base; three phase zero sequence integrated sensors with the same structure are arranged on the mounting base and are correspondingly connected with the phase A, the phase B and the phase C circuits respectively; the phase-zero sequence integrated sensor comprises a silicone rubber jacket, wherein a high-voltage end insert is arranged at the upper end of the silicone rubber jacket, a high-voltage end polypropylene capacitor is arranged in the silicone rubber jacket, energy-taking secondary polypropylene capacitors are arranged at two sides of the polypropylene capacitor, and an inductance element is arranged at the lower end of the polypropylene capacitor; the lower end of the silicon rubber jacket is provided with an aluminum seat, a measuring signal output transformer is arranged in the aluminum seat, and two measuring secondary polypropylene capacitors are symmetrically arranged below the measuring signal output transformer; the bottom of the aluminum seat is provided with two threaded holes; the four-core paired shielding twisted pair wires penetrate out of a through hole a at the bottom of the aluminum seat; the epoxy mixture arranged in the silicone rubber jacket is permeated into the energy-taking secondary polypropylene capacitor, the inductance element, the measuring signal output transformer and the measuring secondary polypropylene capacitor through the through hole b on the aluminum base, so that the energy-taking secondary polypropylene capacitor is integrally sealed and insulated.
Preferably: the high-voltage end polypropylene capacitor is used for dividing energy and measuring one-time common voltage; the energy-taking secondary polypropylene capacitor adopts an inductance element to amplify energy-taking output current, increases energy-taking output power and divides energy-taking secondary voltage; the secondary polypropylene capacitor is measured, and a measuring signal output transformer is adopted to divide the secondary voltage; and the secondary voltage is measured and the energy taking secondary voltage is simultaneously and independently output an energy taking signal and a measuring signal.
Preferably: the energy-taking signals in the A phase, B phase and C phase circuits are connected with the measuring signals into a whole, and are sealed and insulated with the epoxy mixture by a silicon rubber insulating sleeve after integration, and the four-core paired shielding twisted pair is adopted to output signals, so that the energy-taking secondary voltage of the A phase, B phase and C phase circuits and the six pairs of signals for measuring the secondary voltage are output simultaneously.
Preferably: the high-voltage end and the low-voltage end in the phase A, the phase B and the phase C are respectively arranged as axial polypropylene capacitors, and the materials and the structures of the capacitors are the same.
Preferably: and the phase sequence and zero sequence in the phase A, phase B and phase C circuits share the high-voltage end polypropylene capacitor voltage division ratio and output voltage signals are smaller.
Preferably: the energy-taking signal and the measuring signal adopt secondary capacitance parallel fine tuning and adjustable error coils of the same material, and the ratio difference is adjusted at any time.
The invention has the beneficial effects that; energy-taking and measuring capacitive dual voltage sensor for power distribution equipment, compared with a traditional structure: three phase zero sequence integrated sensors with the same structure are arranged and are correspondingly connected with the phase A, the phase B and the phase C circuits respectively; the inductance element is adopted to amplify the energy-taking output current and increase the energy-taking output power; the measuring signal output transformer is adopted, so that an isolation effect can be achieved, the measuring secondary voltage and the energy taking secondary voltage independently output signals, and when the energy taking and the measuring work together, the signals output by the measuring signal output transformer and the energy taking secondary voltage are not interfered with each other and are not influenced with each other; the invention has simple structure, convenient operation, light weight and small volume, and can independently finish installation and debugging by one person, thereby reducing the cost and improving the production efficiency; collect energy taking and measurement, have dual function; the method is widely applicable to outdoor distribution network systems;
the concrete advantages are as follows: (1) The phase voltage signals in the A phase, B phase and C phase circuits are connected with the zero sequence circuit voltage signals into a whole, the whole is sealed and insulated by a silicon rubber insulating sleeve and an epoxy mixture, and the four-core shielded twisted pair cable is led out through the mounting base through secondary fusion of power distribution equipment, so that the secondary voltage signals are ensured to be little interfered by electromagnetic fields and almost not attenuated by transmission, and the four-core paired shielded twisted pair cable is adopted to output signals, so that the phase sequence of the voltages of the A phase, B phase and C phase circuits and the zero sequence six pairs of signals are simultaneously output; the integral sealing technology is adopted for insulation treatment, so that the polypropylene capacitor is not influenced by high temperature, and the performance of the polypropylene capacitor is ensured;
(2) The secondary capacitor adopts the high-temperature polypropylene capacitor as the voltage division, and the high-temperature resistance of the polypropylene capacitor is achieved by adopting the silicon rubber insulating sleeve, and the high-temperature polypropylene capacitor is filled and sealed by the normal-temperature epoxy resin mixture and is adhered to form a whole, so that the original characteristics of the polypropylene capacitor are not affected.
(3) The parallel connection of the secondary capacitors with different capacities is adopted as the capacitance value of the fine-tuning secondary capacitor, the fine-tuning secondary capacitor is in the thousandth level of the secondary main capacitor capacitance, the ratio difference of products is controlled to be 0.05% in the conventional detection, the accuracy of the products is strictly controlled to be 0.2% in the operation of-40 ℃ to +70 ℃, and secondary voltage signals are output through the four-core shielding twisted pair, so that the ratio difference, the phase difference and the anti-interference capability of the products are all ensured.
(4) The phase sequence and zero sequence in the phase A, phase B and phase C circuits adopt a shared high-voltage end polypropylene capacitor voltage division ratio to output a small voltage signal, the temperature drift coefficient is small, the error range is unchanged when the outdoor high-voltage polypropylene capacitor voltage division ratio works at-40 ℃ to +70 ℃, and the anti-interference capability is strong; through the effect of measuring isolation transformer, output measurement secondary voltage and get can secondary voltage small signal, output is linear in whole measuring range, guarantees to get can and measure voltage small signal and separately output, mutually noninterfere, get can with measuring signal independent operation.
Drawings
FIG. 1 is a schematic diagram of the structure of the present invention;
FIG. 2 is a top view of FIG. 1 in accordance with the present invention;
FIG. 3 is a schematic diagram of a capacitive voltage sensor according to the present invention;
in the figure: 1. a high pressure end insert; 2. a high voltage end polypropylene capacitor; 3. an epoxy mixture; 4. a silicone rubber jacket; 5. energy-taking secondary polypropylene capacitor; 6. an inductance element; 7. a measurement signal output transformer; 8. measuring the secondary polypropylene capacitance; 9. four-core paired shielding twisted pair; 10. a mounting base; 11. an aluminum seat.
Detailed Description
In order to make the objects, technical schemes and beneficial technical effects of the invention clearer, the invention is further described in detail below with reference to the accompanying drawings and the detailed description;
in the drawings: energy-taking and measuring capacitive dual voltage sensor for power distribution equipment, comprising a mounting base 10, and characterized in that: the mounting base 10 is arranged in a convex shape, and a plurality of kidney-shaped mounting holes are formed in two sides of the long side of the mounting base 10; three phase zero sequence integrated sensors with the same structure are arranged on the mounting base 10 and are correspondingly connected with A phase, B phase and C phase circuits respectively; the phase zero sequence integrated sensor comprises a silicone rubber jacket 4, a high-voltage end insert 1 is arranged at the upper end of the silicone rubber jacket 4, a high-voltage end polypropylene capacitor 2 is arranged in the silicone rubber jacket 4, energy-taking secondary polypropylene capacitors 5 are arranged on two sides of the polypropylene capacitor 2, and an inductance element 6 is arranged at the lower end of the polypropylene capacitor 2; the lower end of the silicon rubber jacket 4 is provided with an aluminum seat 11, a measuring signal output transformer 7 is arranged in the aluminum seat 11, and two measuring secondary polypropylene capacitors 8 are symmetrically arranged below the measuring signal output transformer 7; two threaded holes are formed in the bottom of the aluminum seat 11; the four-core paired shielding twisted pair 9 passes through a through hole a at the bottom of the aluminum seat; the epoxy mixture 3 arranged in the silicone rubber jacket 4 is permeated through the through hole b on the aluminum seat 11 to seal and insulate the energy-taking secondary polypropylene capacitor 5, the inductance element 6, the measuring signal output transformer 7 and the measuring secondary polypropylene capacitor 8.
The high-voltage end polypropylene capacitor 2 is used for extruding energy and measuring one-time common voltage; the energy-taking secondary polypropylene capacitor 5 adopts an inductance element 6 to amplify energy-taking output current, increases energy-taking output power and divides energy-taking secondary voltage; the secondary polypropylene capacitor 8 is measured, and a secondary voltage is measured by adopting a measurement signal output transformer 7; measuring the secondary voltage and the energy taking secondary voltage and outputting an energy taking signal and a measuring signal simultaneously and independently; the energy-taking signals in the phase A, phase B and phase C circuits are connected with the measuring signals into a whole, and the integrated phase A, phase B and phase C circuits are sealed and insulated with the epoxy mixture 3 by a silicone rubber insulating sleeve 4, and the four-core paired shielding twisted pair is adopted to output signals, so that the energy-taking secondary voltage of the phase A, phase B and phase C circuits and six pairs of signals for measuring the secondary voltage are output simultaneously; the high-voltage end and the low-voltage end in the phase A, the phase B and the phase C circuits are respectively provided with an axial polypropylene capacitor, and the materials and the structures of the capacitors are the same; the phase sequence and zero sequence in the phase A, phase B and phase C circuits share a high-voltage end polypropylene capacitor voltage division ratio output voltage small signal; the method comprises the following steps: the energy-taking signal and the measuring signal adopt secondary capacitance parallel fine tuning and adjustable error coils of the same material, and the ratio difference is adjusted at any time.
The invention is implemented in detail: the three high-voltage capacitors in the whole three-phase circuit are high-voltage end polypropylene capacitors, and three-phase primary voltages are respectively output. The three low-voltage capacitors are energy-taking secondary polypropylene capacitors, the three low-voltage capacitors are measuring secondary polypropylene capacitors, three-phase secondary energy-taking voltages are respectively output, and secondary measuring voltages are output through a measuring signal output transformer. Three-phase six-way output is that three-phase energy taking and three-phase measurement are added, and three paths of energy taking and three paths of measurement are independent; the output signal of the invention adopts a four-core shielding twisted pair. The three phases are six paths of signals, and the marks of the signals are respectively: ua+, ua-, ub+, ub-, uc+, uc-, uan +, uan-, ubn +, ubn-, ucn+, ucn-.
The whole shielding layer of the outer ring of the four-core shielding twisted pair is just grounded. The polypropylene capacitor with the primary high-voltage end has no partial discharge when in air of 14.4kV, the silicon rubber insulating sleeve and the high-temperature polypropylene capacitor are encapsulated by the normal-temperature epoxy resin mixture, and the polypropylene capacitor has no partial discharge when in 14.4kV after being bonded into a whole. The partial discharge capacity of the product is ensured to be small, no discharge exists in the internationally specified range, the consistency of the secondary capacitance material and the structure is further ensured, the distributed capacitance effect is reduced, and the phase difference of the voltage output signals is ensured to be small. The product error range is almost unchanged when the product works at-40 ℃ to +70 ℃, the four-core shielding twisted pair is used as output, and the anti-interference capability is strong.
The high-voltage end polypropylene capacitor and the low-voltage end polypropylene capacitor are adopted in the phase A, phase B and phase C circuits to divide voltage, and through the action of the measuring output transformer, two paths of output voltage small signals are output, the energy taking and measuring voltage small signals are ensured to be output separately, the energy taking and measuring voltage small signals are not interfered with each other, the energy taking and measuring signals are not influenced, the energy taking and measuring signals work independently, and the product performance is ensured to be more reliable. And the consistency of the parameter ratio of the traditional transformer is achieved, and the traditional stock transformer is replaced.
The invention adopts the aluminum seat, the secondary trimming capacitor is placed in the aluminum seat, the ratio difference can be adjusted at any time, and the ratio difference requirement can be met under different load conditions. The four-core paired shielding twisted pair is adopted to output signals, so that the phase sequence and zero sequence paired signals of all voltages of the product are ensured to be output simultaneously.
The invention combines the multifunctional requirements of three-phase voltage sampling, energy taking, measuring, protecting and discharging through the intelligent combination of the internal circuits. The method is applied to an outdoor power distribution network system. Really achieves the effect of secondary depth fusion.
The invention has the advantages that the parts inside the whole product are orderly arranged and intelligently combined, the electromagnetic field interference is avoided, meanwhile, six paths of voltage small signals are output, and the mutual interference is avoided. The function is more powerful than three power supply voltage transformers, three measurement voltage transformers and three discharge coils, and the performance is more superior.
The invention achieves the following service performance:
1. ambient temperature: -40 ℃ -70 ℃.
2. Altitude of sea: and underwriter 2000 m.
3. No obvious dirt such as dust, smoke, corrosive gas, steam or salt exists in the ambient air.
4. Relative humidity: the average value of the relative humidity measured within 24 hours must not exceed 95%.
5. The voltage sensor allows long-term operation at 1.2 times the rated voltage.
The invention uses polypropylene high-voltage primary capacitor and the same material as the polypropylene low-voltage secondary energy taking and measuring capacitor to sample in partial pressure, uses measuring signal output transformer to output two paths of signals to take energy, measure, protect and discharge, uses normal temperature epoxy resin to seal and insulate with the product jacket, uses fifteen meters long four-core shielding twisted pair to connect with the outside, outputs signal pair twisted pair cable, has a combined structure with unchanged terminal precision, is convenient for installation, reduces site wiring, saves space, and is convenient for maintenance. The output of the product is a small voltage signal, the controlled equipment is not damaged, and the product can be directly connected with secondary comprehensive automation equipment interfaces such as an instrument, a relay protection device and the like, thereby realizing the multifunctional requirements of voltage sampling, energy taking, measurement, protection and discharge. The functions are complete, the installation and the use are simple and convenient, the operation reduces the energy consumption, and the equipment maintenance is not needed.
The invention uses the normal temperature epoxy resin mixture with the silicone rubber jacket, the polypropylene capacitor and the small transformer to integrally bond and output voltage signals, thereby saving energy and protecting environment, solving the environmental protection problem in the new era and contributing to the protection of the environment and the health of human beings.
The invention has the advantages of light weight, small volume, space saving during installation, field wiring reduction, simple structure and excellent performance. The single-phase power supply voltage transformer, the single-phase measurement voltage transformer and the single-phase voltage discharge coil with independent structures in the prior art are all combined together. Through the design of the internal circuit, the electromagnetic field is shielded, and all energy taking, measuring and protecting signal on-line monitoring and self-diagnosis are completed while the accuracy and reliability of sampling data are ensured. In particular to a dual function of energy taking and measurement. The combined integrated production mode is realized, the production is convenient, the labor productivity is greatly improved, the production task can be rapidly and quality-guaranteed, the production time is greatly shortened, the rapid production rhythm of the new era is met, and the delivery period of a user is met.
The invention relates to a low-voltage novel energy-taking, measuring and protecting sensor which is suitable for being used in an outdoor power distribution network system. The sensor has strong functions, small signal output does not need secondary conversion, can be directly connected into secondary equipment through A/D conversion, and meets the requirements of digital, intelligent and networked development in various fields of electric power industry such as control and protection of electric power network equipment, state maintenance, electric energy metering, electric energy quality measurement and the like. The measuring range is wide, and the defects of narrow frequency band, slow response and the like of the traditional electromagnetic sampling device are overcome. The sampling of the small voltage signals fundamentally eliminates the major fault hidden trouble in the operation of the power system and ensures the safety of personnel and equipment to the greatest extent.
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 (3)
1. Energy-taking and measuring capacitive dual voltage sensor for power distribution equipment, comprising a mounting base (10), and being characterized in that: the mounting base (10) is arranged in a convex shape, and a plurality of kidney-shaped mounting holes are formed in two sides of the long side of the mounting base (10); three phase zero sequence integrated sensors with the same structure are arranged on the mounting base (10) and are correspondingly connected with A phase, B phase and C phase circuits respectively; the phase zero sequence integrated sensor comprises a silicon rubber jacket (4), wherein a high-voltage end insert (1) is arranged at the upper end of the silicon rubber jacket (4), a high-voltage end polypropylene capacitor (2) is arranged in the silicon rubber jacket (4), energy-taking secondary polypropylene capacitors (5) are arranged at two sides of the polypropylene capacitor (2), and an inductance element (6) is arranged at the lower end of the polypropylene capacitor (2); the lower end of the silicon rubber jacket (4) is provided with an aluminum seat (11), a measuring signal output transformer (7) is arranged in the aluminum seat (11), and two measuring secondary polypropylene capacitors (8) are symmetrically arranged below the measuring signal output transformer (7); two threaded holes are formed in the bottom of the aluminum seat (11); the four-core paired shielding twisted pair wires (9) penetrate out of a through hole a at the bottom of the aluminum seat; the epoxy mixture (3) arranged in the silicone rubber jacket (4) is permeated into the energy-taking secondary polypropylene capacitor (5), the inductance element (6), the measuring signal output transformer (7) and the measuring secondary polypropylene capacitor (8) through the through hole b on the aluminum seat (11) to be sealed and insulated integrally;
the high-voltage end polypropylene capacitor (2) divides voltage to obtain energy and measures a primary common voltage; the energy-taking secondary polypropylene capacitor (5) adopts an inductance element (6) to amplify energy-taking output current, increases energy-taking output power and divides energy-taking secondary voltage; the secondary polypropylene capacitor (8) is measured, and a secondary voltage is measured by adopting a measurement signal output transformer (7); measuring the secondary voltage and the energy taking secondary voltage and outputting an energy taking signal and a measuring signal simultaneously and independently;
the phase sequence and zero sequence in the phase A, phase B and phase C circuits share a high-voltage end polypropylene capacitor voltage division ratio output voltage small signal;
the energy-taking signal and the measuring signal adopt secondary capacitance parallel fine tuning and adjustable error coils of the same material, and the ratio difference is adjusted at any time.
2. The energy taking and measuring capacitive dual voltage sensor for power distribution equipment according to claim 1, wherein: the energy-taking signals in the A phase, B phase and C phase circuits are connected with the measuring signals into a whole, and are sealed and insulated with the epoxy mixture (3) by the silicone rubber insulating sleeve (4) after integration, and the four-core paired shielding twisted pair is adopted to output signals, so that the energy-taking secondary voltage of the A phase, B phase and C phase circuits and the six pairs of signals for measuring the secondary voltage are output simultaneously.
3. The energy taking and measuring capacitive dual voltage sensor for power distribution equipment according to claim 1, wherein: the high-voltage end and the low-voltage end in the phase A, the phase B and the phase C are respectively arranged as axial polypropylene capacitors, and the materials and the structures of the capacitors are the same.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201810933521.0A CN108710020B (en) | 2018-08-16 | 2018-08-16 | Energy-taking and measuring capacitive dual voltage sensor for power distribution equipment |
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| CN201810933521.0A CN108710020B (en) | 2018-08-16 | 2018-08-16 | Energy-taking and measuring capacitive dual voltage sensor for power distribution equipment |
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| CN108710020B true CN108710020B (en) | 2023-12-08 |
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| CN112305314B (en) * | 2019-07-31 | 2025-04-04 | 北京邦瑞智能电网技术有限公司 | Capacitive equipment and monitoring device for insulation parameters of capacitive equipment |
| CN110473739A (en) * | 2019-08-19 | 2019-11-19 | 陕西省地方电力(集团)有限公司延安供电分公司 | A kind of novel one or two fusions vacuum circuit breaker polar |
| CN111693750A (en) * | 2020-08-03 | 2020-09-22 | 江苏靖江互感器股份有限公司 | Intelligent cable voltage sensor |
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| CN108710020A (en) | 2018-10-26 |
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