CN204256016U - A kind of for power transmission line lightning shielding flow measurement can open type Rogowski coil - Google Patents
A kind of for power transmission line lightning shielding flow measurement can open type Rogowski coil Download PDFInfo
- Publication number
- CN204256016U CN204256016U CN201420731855.7U CN201420731855U CN204256016U CN 204256016 U CN204256016 U CN 204256016U CN 201420731855 U CN201420731855 U CN 201420731855U CN 204256016 U CN204256016 U CN 204256016U
- Authority
- CN
- China
- Prior art keywords
- coil
- threaded
- luo
- framework
- thread groove
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Withdrawn - After Issue
Links
- 230000005540 biological transmission Effects 0.000 title claims abstract description 16
- 238000005259 measurement Methods 0.000 title claims abstract description 12
- 239000003822 epoxy resin Substances 0.000 claims abstract description 5
- 229920000647 polyepoxide Polymers 0.000 claims abstract description 5
- 238000000926 separation method Methods 0.000 claims description 14
- 238000009434 installation Methods 0.000 abstract description 5
- 238000004804 winding Methods 0.000 abstract description 5
- 208000027418 Wounds and injury Diseases 0.000 description 15
- 210000000988 bone and bone Anatomy 0.000 description 6
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 5
- 230000008859 change Effects 0.000 description 4
- 230000005611 electricity Effects 0.000 description 4
- 239000000463 material Substances 0.000 description 4
- 239000004033 plastic Substances 0.000 description 4
- 229920003023 plastic Polymers 0.000 description 4
- 239000010949 copper Substances 0.000 description 3
- 229910052802 copper Inorganic materials 0.000 description 3
- 230000010354 integration Effects 0.000 description 3
- 239000005030 aluminium foil Substances 0.000 description 2
- 230000008901 benefit Effects 0.000 description 2
- 238000010276 construction Methods 0.000 description 2
- 239000011889 copper foil Substances 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 239000011810 insulating material Substances 0.000 description 2
- 239000002184 metal Substances 0.000 description 2
- 229910052751 metal Inorganic materials 0.000 description 2
- 208000025274 Lightning injury Diseases 0.000 description 1
- 239000004411 aluminium Substances 0.000 description 1
- 229910052782 aluminium Inorganic materials 0.000 description 1
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 1
- 230000004888 barrier function Effects 0.000 description 1
- 239000004020 conductor Substances 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 230000005672 electromagnetic field Effects 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 238000009413 insulation Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
- 229920002379 silicone rubber Polymers 0.000 description 1
- 230000001052 transient effect Effects 0.000 description 1
Landscapes
- Measuring Instrument Details And Bridges, And Automatic Balancing Devices (AREA)
Abstract
The utility model discloses a kind of for power transmission line lightning shielding flow measurement can open type Rogowski coil, comprise coil case, lower coil shell, flexible Luo-coil threaded framework, coiled wire-wound coil, insulating sleeve, internal shield, heat-shrink tube etc., coiled wire-wound coil is wrapped in the thread groove in flexible Luo-coil threaded framework equably, and overlapping successively at the skin of flexible Luo-coil threaded framework and coiled wire-wound coil has insulating sleeve, internal shield and heat-shrink tube.It adopts screwed flexible Luo-coil threaded framework and forward and reverse crossing double-deck winding mode, can not only guarantee that coiled wire-wound coil coiling evenly and improve the electromagnetism anti-interference of Luo-coil, and efficiently solve the problem of traditional closo hard structure Luo-coil in-site installation inconvenience.In skeleton outer shell cavity, the epoxy resin layer of embedding improves physical strength and the stability of Luo-coil entirety, Luo-coil can be avoided to be subject to external force overstock and be out of shape, guarantee measuring accuracy and the serviceable life of Luo-coil.
Description
Technical field
The utility model relates to electronic current mutual inductor correlative technology field, especially relate to a kind of for power transmission line lightning shielding flow measurement can open type Rogowski coil.
Background technology
Lightning fault is one of accident of taking place frequently most of transmission line of electricity trip accident, lightning parameter is not only the basis of electrical network lightning Protection Design accurately, still study lightning performance, analyze the prerequisite of lightening hazard etc., therefore the measurement of lightning parameter plays vital effect in electrical network lightning protection, measure bandwidth because Roche (Rogowski) coil has, the advantage such as the linearity is good, structure is simple, antijamming capability is strong, be often used to the measurement of transmission line lightning stroke fault lightning current parameter.
The Luo-coil being conventionally used to transient state travelling wave current measurement mostly is complete closo hard structure, namely shell is the closed annular metallic shield of aluminium or copper product, when for measuring the lightning current fault waveform that transmission line of electricity flows through, closing coil is passed due to transmission pressure must be made, then often need that tested wire is disconnected and could pass Luo-coil, bring great inconvenience to the in-site installation of equipment, this Luo-coil does not have hard shell protection and plasticity; For this reason, also have scholar to propose the Luo-coil be put together by two semi-circular shape skeletons, but cross section hinge connection often destroys the integrality of circular framework, and coiled wire-wound coil easily cause broken string due to the wearing and tearing of folding repeatedly of Luo-coil.
At present, the technical scheme adopted for this problem is generally the Luo-coil using flexible back bone, main existence two defects: one is after flexible back bone is wound in transmission pressure, because the change of its shape along with conductor galloping, temperature and pressure can change, the shape and structure of coiled wire-wound coil is caused to change, and then change structural parameters and the electric parameter of Luo-coil, thus have impact on the Measurement accuracy of lightning current parameter.Two easily cause when being coilings on flexible back bone framework deformation, coiled wire-wound coil to break and coiling uniformity coefficient is difficult to the manufacture craft problems such as accurately control; In addition, in order to the electromagnetism anti-interference improving Luo-coil is often first along flexible back bone coiling one loop line before coiling, be difficult to ensure loop line and the complete keeping parallelism of flexible back bone after coil winding is good, make Luo-coil structural parameters and design parameter there is larger error.
Summary of the invention
The purpose of this utility model is to provide a kind of and adopts the complete flexible Luo-coil threaded framework of one end open, be convenient to measure the lightning current fault waveform that transmission line of electricity flows through, easy for installation, Stability Analysis of Structures, dependable performance can open type Rogowski coil.
The purpose of this utility model is achieved in that
A kind of for power transmission line lightning shielding flow measurement can open type Rogowski coil, feature is: comprise coil case, lower coil shell, flexible Luo-coil threaded framework, coiled wire-wound coil, insulating sleeve, internal shield, heat-shrink tube, integrating resistor, BNC (Bayonet Neill-Concelman) joint, threaded connector and screw nut, the left end being the left end of semicircular upper coil case and lower coil shell is hinged in opposite directions by hinge, the right-hand member of upper coil case is connected by nut with the right-hand member of lower coil shell, forms a circle, circular and the latter half of the flexible Luo-coil threaded framework of right-end openings is fixed on the inwall of lower coil shell, the sidewall of flexible Luo-coil threaded framework is processed with thread groove, coiled wire-wound coil is wrapped in the thread groove in flexible Luo-coil threaded framework equably, insulating sleeve is had at the skin cover of flexible Luo-coil threaded framework and coiled wire-wound coil, internal shield is wrapped in the skin of insulating sleeve, heat-shrink tube is wrapped in the skin of internal shield, integrating resistor and the BNC connector for being connected with the signal processing circuit of outside is also provided with in lower coil outer shell cavity, two of coiled wire-wound coil connects two input ends of BNC connector respectively, integrating resistor is connected in parallel between two input ends of BNC connector, threaded connector is made up of threaded connector male and threaded connector female, and the two ends of flexible Luo-coil threaded framework right-end openings are separately fixed in threaded connector male and threaded connector female, and threaded connector male and threaded connector female are threaded connection.
Thread groove in flexible Luo-coil threaded framework is forward and reverse crossing two thread grooves, and two exist separation between adjacent thread groove in the same way, and separation is 3 times of thread groove diameter.
Or the thread groove in flexible Luo-coil threaded framework is unidirectional thread groove, the separation between two unidirectional thread grooves is 2 times of unidirectional thread groove diameter.
The separation of two thread groove and unidirectional thread groove is equidistantly.
Coiled wire-wound coil is copper enameled wire, and diameter is 0.02 ∽ 1mm, and flexible Luo-coil threaded framework adopts during coiling forward and reverse crossing double-deck winding mode.
The material of described internal shield is aluminium foil or Copper Foil, and thickness is 0.01 ∽ 0.1mm.
In lower coil outer shell cavity, embedding has epoxy resin, for fixing flexible Luo-coil threaded framework, integrating resistor, BNC connector and threaded connector.
Upper coil case and lower coil shell are made by plastics or metal.
Have a skeleton groove in the inner side of upper coil case, flexible Luo-coil threaded framework is placed in this skeleton groove, can downward fixing flexible Luo-coil threaded framework during upper coil enclosure closed.
The utility model proposes a kind of for power transmission line lightning shielding flow measurement can open type Rogowski coil, adopt screwed flexible Luo-coil threaded framework, can guarantee during coiling that coiled wire-wound coil is even, forward and reverse crossing double-deck winding mode and internal shield can strengthen the antijamming capability of interfere with electromagnetic field to external world, upper coil case and lower coil shell that two semicircle plastics make are housed for flexible Luo-coil threaded framework outside skeleton, the epoxy resin layer of embedding can improve physical strength and the stability of Luo-coil entirety, Luo-coil is avoided to be subject to external force overstock and be out of shape, guarantee measuring accuracy and the serviceable life of Luo-coil.
Compared with prior art, what the utility model proposes can adopt the complete flexible Luo-coil threaded framework of one end open and semicircular upper coil case by open type Rogowski coil, lower coil shell, namely the latter half of flexible Luo-coil threaded framework and lower coil shell are fixed, the first half and the upper coil case of flexible Luo-coil threaded framework are separable, coil case is directly allowed to snap into flexible Luo-coil threaded framework after flexible Luo-coil threaded framework is fixing, facilitate the lightning current fault waveform measured and transmission line of electricity flows through like this, not only overcome the problem of traditional closo hard structure Luo-coil in-site installation inconvenience, and solve the frame configuration distortion of the current use flexible back bone Luo-coil existence when power transmission line lightning shielding flow measurement, measuring accuracy difference and coiling uniformity coefficient are difficult to the technical barriers such as control.In addition, the utility model also has the advantage of stronger electromagnetism antijamming capability, easy for installation, Stability Analysis of Structures, dependable performance, improves the measuring accuracy of power transmission line lightning shielding stream.
Accompanying drawing explanation
Fig. 1 is one-piece construction schematic diagram of the present utility model;
Fig. 2 is the structural representation of flexible Luo-coil threaded framework (the two thread groove of band);
Fig. 3 is the schematic cross-section after flexible Luo-coil threaded framework is wound around coiled wire-wound coil;
Fig. 4 is the structural representation of threaded connector;
Fig. 5 is the structural representation of flexible Luo-coil threaded framework (with unidirectional thread groove);
Fig. 6 is the cross sectional representation of lower coil shell;
Fig. 7 is the cross sectional representation of upper coil case.
In figure, 1. go up coil case, 2. flexible Luo-coil threaded framework, 3. hinge, 4 threaded connectors, 5. screw nut, 6. lower coil shell, 7. wire, 8. integrating resistor, 9.BNC joint, 10. thread groove, 11. coiled wire-wound coils, 12. insulating sleeves, 13. internal shields, 14. heat-shrink tubes, 15. threaded connector males, 16. screw threads, 17. threaded connector females, 18. lower coil outer shell cavities, 19. skeleton grooves.
Embodiment
Below in conjunction with the drawings and specific embodiments, the utility model is described in more detail.
Embodiment 1:
Fig. 1 is one-piece construction schematic diagram of the present utility model, the left end being the left end of semicircular upper coil case 1 and lower coil shell 6 is hinged in opposite directions by hinge 3, the right-hand member of upper coil case 1 is connected by screw nut 5 with the right-hand member of lower coil shell 6, forms a circle, semicircular flexible Luo-coil threaded framework 2 is all fixed with at the inwall of upper coil case 1 and the inwall of lower coil shell 6, the sidewall of flexible Luo-coil threaded framework 2 is processed with thread groove 10, coiled wire-wound coil 11 is wrapped in the thread groove 10 in flexible Luo-coil threaded framework 2 equably, insulating sleeve 12 is had at the skin cover of flexible Luo-coil threaded framework 2 and coiled wire-wound coil 11, internal shield 13 is wrapped in the skin of insulating sleeve 12, heat-shrink tube 14 is wrapped in the skin of internal shield 13, heat-shrink tube 14 uses heat gun to heat post shrinkage distortion, external shielding layer 13 is made to be fixed on insulating sleeve 12, and play insulation protection effect.In lower coil shell 2 chamber 18, be also provided with integrating resistor 8 and the BNC connector 9 for being connected with the signal processing circuit of outside, two of coiled wire-wound coil 11 connects two input ends of BNC connector 9 respectively, and integrating resistor 8 is connected in parallel between two input ends of BNC connector 9; Threaded connector 4 is made up of threaded connector male 15 and threaded connector female 17, the two ends of flexible Luo-coil threaded framework 4 right-end openings are separately fixed in threaded connector male 15 and threaded connector female 17, and threaded connector male 15 is connected by the external thread 16 in threaded connector male 15 with threaded connector female 17.
Thread groove 10 in flexible Luo-coil threaded framework 2 is forward and reverse crossing two thread grooves, and two exist separation between adjacent thread groove in the same way, separation be 3 times of thread groove 10 diameter.The material of flexible Luo-coil threaded framework 2 is the soft insulating material that soft insulating material silicon rubber or other thermal stability factors are higher.
The separation of two thread groove is equidistant.
Threaded connector 4 is plastic material, is provided with external thread 16 at the outer wall of threaded connector male 15, and threaded connector female 17 can FREE TORSION be slided.
Coiled wire-wound coil 11 is copper enameled wire, and diameter is 0.02 ∽ 1mm, and flexible Luo-coil threaded framework 2 adopts during coiling forward and reverse crossing double-deck winding mode.
The material of internal shield 13 is aluminium foil or Copper Foil, and thickness is 0.01 ∽ 0.1mm.
In lower coil outer shell cavity 18, embedding has epoxy resin, for fixing flexible Luo-coil threaded framework 2, integrating resistor 8, BNC connector 9 and threaded connector 4.
Upper coil case 1 and lower coil shell 6 are made by plastics or metal.
A skeleton groove 19 is had in the inner side of upper coil case 1, flexible Luo-coil threaded framework 2 is placed in this skeleton groove 19, lower coil shell 1 is separated with flexible Luo-coil threaded framework 2, first be connected and fixed flexible Luo-coil threaded framework 2 with threaded connector 4 when mounted, cover coil case 1 downwards again, make skeleton groove clamp flexible Luo-coil threaded framework 2.
In this embodiment, the value of integrating resistor 8 is less, is 0.5 Ω, forms from integration type Luo-coil, and integrating resistor 8 responds in order to integration reduction Luo-coil the differential signal obtained, thus makes output signal and tested current in proportion relation.In actual applications, the signal range that can export according to Luo-coil and the demand of signal to noise ratio (S/N ratio), select resistance value, general span is at 0.01 Ω ∽ 1 Ω.
Embodiment 2:
The structure of embodiment 2 is substantially the same manner as Example 1, and difference is:
Thread groove 10 in flexible Luo-coil threaded framework 2 is unidirectional thread groove, and the separation between two unidirectional thread grooves is 2 times of unidirectional thread groove diameter.
The separation of unidirectional thread groove is equidistant.
Embodiment 3:
In this embodiment, the value of integrating resistor 8 is comparatively large, is 510 Ω, forms outer integration type Luo-coil, integrating resistor 8 and the integrating circuit be made up of operational amplifier jointly reduce Luo-coil and respond to the differential signal obtained, thus make output signal and tested current in proportion relation.
The above embodiment only have expressed several embodiment of the present utility model, and it describes comparatively concrete and detailed, but therefore can not be interpreted as the restriction to the utility model the scope of the claims.It should be pointed out that for the person of ordinary skill of the art, without departing from the concept of the premise utility, can also make some distortion and improvement, these all belong to protection domain of the present utility model.Therefore, the protection domain of the utility model patent should be as the criterion with claims.
Claims (8)
1. one kind for power transmission line lightning shielding flow measurement can open type Rogowski coil, it is characterized in that: comprise coil case, lower coil shell, flexible Luo-coil threaded framework, coiled wire-wound coil, insulating sleeve, internal shield, heat-shrink tube, integrating resistor, BNC connector, threaded connector and screw nut, the left end being the left end of semicircular upper coil case and lower coil shell is hinged in opposite directions by hinge, the right-hand member of upper coil case is connected by screw nut with the right-hand member of lower coil shell, forms a circle, circular and the latter half of the flexible Luo-coil threaded framework of right-end openings is fixed on the inwall of lower coil shell, the sidewall of flexible Luo-coil threaded framework is processed with thread groove, coiled wire-wound coil is wrapped in the thread groove in flexible Luo-coil threaded framework equably, insulating sleeve is had at the skin cover of flexible Luo-coil threaded framework and coiled wire-wound coil, internal shield is wrapped in the skin of insulating sleeve, heat-shrink tube is wrapped in the skin of internal shield, integrating resistor and the BNC connector for being connected with the signal processing circuit of outside is provided with in lower coil outer shell cavity, two of coiled wire-wound coil connects two input ends of BNC connector respectively, integrating resistor is connected in parallel between two input ends of BNC connector, threaded connector is made up of threaded connector male and threaded connector female, and the two ends of flexible Luo-coil threaded framework right-end openings are separately fixed in threaded connector male and threaded connector female, and threaded connector male and threaded connector female are threaded connection.
2. according to claim 1 can open type Rogowski coil, it is characterized in that: the thread groove in flexible Luo-coil threaded framework is forward and reverse crossing two thread grooves.
3. according to claim 2 can open type Rogowski coil, it is characterized in that: two exist separation between adjacent thread groove in the same way, separation is 3 times of thread groove diameter.
4. according to claim 1 can open type Rogowski coil, it is characterized in that: the thread groove in flexible Luo-coil threaded framework is unidirectional thread groove.
5. according to claim 4 can open type Rogowski coil, it is characterized in that: there is separation between two unidirectional thread grooves, separation is 2 times of thread groove diameter.
6. according to claim 2 or 4 can open type Rogowski coil, it is characterized in that: the separation of two thread groove and unidirectional thread groove is equidistantly.
7. according to claim 1 can open type Rogowski coil, it is characterized in that: in the chamber of lower coil shell, embedding has epoxy resin, for fixing flexible Luo-coil threaded framework, integrating resistor, BNC connector and threaded connector.
8. according to claim 1 can open type Rogowski coil, it is characterized in that: have a skeleton groove in the inner side of upper coil case, flexible Luo-coil threaded framework is placed in this skeleton groove, can downward fixing flexible Luo-coil threaded framework during upper coil enclosure closed.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420731855.7U CN204256016U (en) | 2014-11-26 | 2014-11-26 | A kind of for power transmission line lightning shielding flow measurement can open type Rogowski coil |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420731855.7U CN204256016U (en) | 2014-11-26 | 2014-11-26 | A kind of for power transmission line lightning shielding flow measurement can open type Rogowski coil |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN204256016U true CN204256016U (en) | 2015-04-08 |
Family
ID=52960309
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201420731855.7U Withdrawn - After Issue CN204256016U (en) | 2014-11-26 | 2014-11-26 | A kind of for power transmission line lightning shielding flow measurement can open type Rogowski coil |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN204256016U (en) |
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104407192A (en) * | 2014-11-26 | 2015-03-11 | 国家电网公司 | Openable Rogowski coil assembly for measuring lightning current in power transmission line |
| CN108680829A (en) * | 2018-06-15 | 2018-10-19 | 重庆东电科技有限公司 | Transmission open acess on-line monitoring system |
| CN109613316A (en) * | 2018-11-29 | 2019-04-12 | 江阴市星火电子科技有限公司 | A kind of high-precision rogowski coil |
| CN109613318A (en) * | 2018-11-29 | 2019-04-12 | 江阴市星火电子科技有限公司 | A kind of measurement low current Rogowski coil and its manufacturing method |
| CN109613320A (en) * | 2018-11-29 | 2019-04-12 | 江阴市星火电子科技有限公司 | Measure low current Rogowski coil |
| CN113433372A (en) * | 2021-06-24 | 2021-09-24 | 邹婕 | Non-contact current detection device of building fire-fighting equipment |
-
2014
- 2014-11-26 CN CN201420731855.7U patent/CN204256016U/en not_active Withdrawn - After Issue
Cited By (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104407192A (en) * | 2014-11-26 | 2015-03-11 | 国家电网公司 | Openable Rogowski coil assembly for measuring lightning current in power transmission line |
| CN108680829A (en) * | 2018-06-15 | 2018-10-19 | 重庆东电科技有限公司 | Transmission open acess on-line monitoring system |
| CN108680829B (en) * | 2018-06-15 | 2023-10-27 | 重庆东电通信技术有限公司 | Fault positioning on-line monitoring system for power transmission line |
| CN109613316A (en) * | 2018-11-29 | 2019-04-12 | 江阴市星火电子科技有限公司 | A kind of high-precision rogowski coil |
| CN109613318A (en) * | 2018-11-29 | 2019-04-12 | 江阴市星火电子科技有限公司 | A kind of measurement low current Rogowski coil and its manufacturing method |
| CN109613320A (en) * | 2018-11-29 | 2019-04-12 | 江阴市星火电子科技有限公司 | Measure low current Rogowski coil |
| CN109613320B (en) * | 2018-11-29 | 2020-10-30 | 江阴市星火电子科技有限公司 | Rogowski coil for measuring small current |
| CN109613316B (en) * | 2018-11-29 | 2020-12-29 | 江阴市星火电子科技有限公司 | High-precision Rogowski coil |
| CN109613318B (en) * | 2018-11-29 | 2021-01-26 | 江阴市星火电子科技有限公司 | Rogowski coil for measuring small current and manufacturing method thereof |
| CN113433372A (en) * | 2021-06-24 | 2021-09-24 | 邹婕 | Non-contact current detection device of building fire-fighting equipment |
| CN113433372B (en) * | 2021-06-24 | 2022-06-10 | 邹婕 | Non-contact current detection device of building fire-fighting equipment |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN104407192A (en) | Openable Rogowski coil assembly for measuring lightning current in power transmission line | |
| CN204256016U (en) | A kind of for power transmission line lightning shielding flow measurement can open type Rogowski coil | |
| CN102436897B (en) | Flexible Rogowski coil used for detecting direct-current system short-circuit current and method for designing same | |
| CN103308832A (en) | Partial discharge test device for high-voltage cable insulation middle joint and use method | |
| CN204789706U (en) | Open type luo shi coil | |
| CN105185559A (en) | Medium and high voltage type combined electronic transformer | |
| CN207881629U (en) | The stranded Rogovski current sensor of for transformer winding deformation monitoring | |
| CN109613318A (en) | A kind of measurement low current Rogowski coil and its manufacturing method | |
| CN203324357U (en) | Electronic voltage transformer used for detecting high voltage resistor current | |
| CN206583955U (en) | A kind of multi-function electronic current-voltage transformer | |
| CN203025258U (en) | High-voltage on-line electric parameter measuring device | |
| CN203882794U (en) | Hollow coil used for electronic current transformer | |
| CN202870144U (en) | Current measuring device for breaker or switch cabinet | |
| CN207264896U (en) | A kind of electronic current mutual inductor of assembling | |
| CN202905447U (en) | Modified outdoor current transformer | |
| CN202473587U (en) | Feedthrough type current transformer | |
| CN101930838A (en) | Electronic type voltage transformer | |
| CN207067225U (en) | A kind of passive integral form pulses of current sensor based on flexible Luo-coil | |
| CN203553071U (en) | Electronic plastic housing circuit breaker | |
| CN204375981U (en) | Instrument transformer power supply lead wire is anti-connects empty sleeve pipe | |
| CN204287308U (en) | A kind of New type of current sensor adopting Rogowski coil principle | |
| CN104345196A (en) | Active weak power frequency current induction coil | |
| CN203117261U (en) | Novel open magnetic-core-free current sensor with compensation structure | |
| CN204668132U (en) | A kind of ultracrystalline magnetic core zero sequence current mutual inductor | |
| CN203055784U (en) | Magnetic ring and single-ended wire outgoing-type magnetic sensitive temperature switch adopting same |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| AV01 | Patent right actively abandoned | ||
| AV01 | Patent right actively abandoned |
Granted publication date: 20150408 Effective date of abandoning: 20171103 |