CN110895289A - Current measuring device - Google Patents
Current measuring device Download PDFInfo
- Publication number
- CN110895289A CN110895289A CN201811061850.7A CN201811061850A CN110895289A CN 110895289 A CN110895289 A CN 110895289A CN 201811061850 A CN201811061850 A CN 201811061850A CN 110895289 A CN110895289 A CN 110895289A
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- Prior art keywords
- conductor
- shunt
- metal shell
- current measuring
- measuring device
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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
- G01R19/0092—Arrangements for measuring currents or voltages or for indicating presence or sign thereof measuring current only
-
- 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
Abstract
The invention provides a current measuring device, which comprises a first metal shell; the first insulating basin and the second insulating basin are connected with the first metal shell; the first central conductor, the first conductor, the shunt, the second conductor, the third conductor and the second central conductor are arranged in the first metal shell and are sequentially connected; and the voltage collector is arranged in the first metal shell and connected with the shunt, and is used for measuring a voltage signal of the shunt. The first insulating basin, the second insulating basin and the first metal shell form a closed air chamber, the shunt and the voltage collector are positioned in the closed air chamber to ensure that the shunt and the voltage collector are isolated from the external environment and are prevented from being corroded by dirt in the environment, and the closed air chamber replaces the existing composite insulator to ensure that a plurality of conductors in the first metal shell and the first metal shell, the shunt and the voltage collector are in an insulating state, so that the size of the device is reduced, the applicability is wider, and the use cost is reduced.
Description
Technical Field
The invention relates to the technical field of measurement, in particular to a current measuring device.
Background
Direct current is the most important current utilization mode, direct current application cannot separate direct current measurement, and a direct current measurement device is an indispensable key device in a direct current transmission station and a direct current power system, and is mainly used for measuring direct current in the system, monitoring the current of the system and providing direct current state data for control and protection of the system.
At present, most of offshore wind power generation devices adopt traditional strut type or suspension type direct current measuring devices, but because offshore salt fog is large, composite sleeves or composite insulators and the like in the devices are easily corroded by salt fog dirt, the insulating property of the devices is reduced, electric leakage is easy to occur, and normal operation of the devices is affected.
Disclosure of Invention
In view of this, the embodiment of the present invention provides a current measuring device to solve the problem in the prior art that the normal operation of the device is affected due to the decrease of the insulating property and the occurrence of electric leakage caused by the pollution erosion of the composite bushing or the composite insulator.
In order to achieve the above purpose, the embodiments of the present invention provide the following technical solutions:
a current measurement device comprising:
a first metal housing;
the first insulating basin and the second insulating basin are connected with the first metal shell;
the first central conductor, the first conductor, the shunt, the second conductor, the third conductor and the second central conductor of the second insulating basin are arranged in the first metal shell and are sequentially connected;
the voltage collector is arranged in the first metal shell and connected with the shunt, and is used for measuring a voltage signal of the shunt;
and the inflation joint is used for filling insulating gas into a closed gas chamber formed by the first insulating basin, the second insulating basin and the first metal shell, so that the first metal shell, the first central conductor, the first conductor, the shunt, the second conductor, the third conductor and the second central conductor are in an insulating state.
Optionally, the voltage collector includes:
the acquisition module mother board is connected with the signal line at the two ends of the shunt, the acquisition module mother board is used for acquiring voltage signals at the two ends of the shunt, N acquisition modules are installed on the acquisition module mother board and used for converting the voltage signals into optical signals, and N is a positive integer greater than or equal to 1.
Optionally, the acquisition module supplies energy to the laser through the laser board card of the merging unit.
Optionally, the current measuring apparatus further includes:
a shield can mounted on the second conductor, the shield can capable of housing the first conductor, the shunt, and the second conductor.
Optionally, the current measuring apparatus further includes:
a second metal shell mounted outside the first metal shell;
and one end of the optical fiber fusion box is connected with the voltage collector through an optical fiber interface on the optical fiber adapter flange, and the other end of the optical fiber fusion box is connected with the merging unit through an optical fiber.
Optionally, the second metal housing includes a junction box.
Optionally, the voltage collector is disposed inside the second conductor.
Optionally, the first conductor, the shunt and the second conductor are connected through a screw and a nut.
Optionally, the inflation joint is further connected with a gas density meter.
Optionally, the contact surfaces of the first central conductor, the second central conductor, the first conductor, the second conductor and the third conductor are silver-plated surfaces.
Based on the current measuring device provided by the embodiment of the invention, the first insulating basin, the second insulating basin and the first metal shell form a closed air chamber, and the shunt and the voltage collector are positioned in the closed air chamber, so that the shunt and the voltage collector can be isolated from the external environment. And because the first metal shell is made of metal materials, the pollution erosion in the environment can be avoided, and besides the closed air chamber replaces the existing composite insulator to enable the plurality of conductors, the shunt and the voltage collector in the first metal shell and the first metal shell to be in an insulating state, the volume of the device is reduced, the applicability is wider, and the use cost is reduced.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the provided drawings without creative efforts.
Fig. 1 is a schematic structural diagram of a current measuring device disclosed in an embodiment of the present invention;
fig. 2 is a schematic diagram of the operation of the current measuring apparatus according to the embodiment of the present invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
In this application, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other identical elements in a process, method, article, or apparatus that comprises the element.
According to the background technology, at present, in offshore wind power generation, most of the traditional column type or suspension type direct current measuring devices are adopted, but due to the fact that salt fog is large on the sea, a composite sleeve or a composite insulator and the like in the device are easily corroded by salt fog dirt, the insulating property of the device is reduced, the electric leakage phenomenon is easy to occur, and the normal operation of the device is influenced.
In addition, it should be noted that, in addition to the problem that the insulation performance is reduced due to the fact that the composite insulator adopted in the prior art is easily corroded by dirt, the length of the general design is long due to the influence of factors such as weather, altitude and creepage phenomena, so that the overall height of the device is high, the requirement for the design of a transformer substation factory building is high, the cost is increased, and the applicability is poor.
The embodiment of the invention provides a current measuring device, which aims to solve the problems that in the prior art, a composite sleeve or a composite insulator is corroded by dirt, the insulating property is reduced, electric leakage occurs, and the normal operation of the device is influenced. Meanwhile, the device has the characteristics of small volume, wide applicability and low cost. The embodiment of the application discloses a current measuring device, as shown in fig. 1, its shell includes: first insulating basin 4, second insulating basin 24 and first metal casing 6, wherein:
the first metal shell 6 is internally provided with a first central conductor 3, a first conductor 5, a shunt 7, a second conductor 8, a third conductor 13 of the first insulating basin 4 and a second central conductor 23 of the second insulating basin 24 which are connected in sequence.
It should be noted that the first central conductor 3, the first conductor 5, the shunt 7, the second conductor 8, the third conductor 13 and the second central conductor 23 form a current path, and when a current flows through the shunt 7, a voltage difference is generated between two ends of the shunt 7, and the voltage difference is proportional to the magnitude of the current flowing through the shunt 7.
Optionally, the first conductor 5, the shunt 7 and the second conductor 8 are connected by a screw and a nut and fixed on the first central conductor 3, the second conductor 8 is provided with the conductive contact finger 12, and after the third conductor 13 and the second central conductor 23 are coaxially mounted and fixed, the third conductor 13 is inserted into the right side of the second conductor 8; the design can ensure that the conducting direction and the axial size of the device are matched, and can also avoid the occurrence of part damage caused by the axial and radial mechanical stress on the shunt.
The first metal shell 6 is internally provided with a voltage collector connected with the shunt, and the voltage collector is used for measuring a voltage signal of the shunt.
Optionally, the voltage collector is disposed inside the second conductor 8.
It should be noted that, the current flowing through the conductor can heat the conductor, and in order to prevent the voltage collector inside the second conductor 8 from malfunctioning due to overheating, heat dissipation holes are formed on the second conductor 8 along the circumferential surface to ensure the normal operation of the voltage collector.
Optionally, the voltage collector includes:
the collection module motherboard that is connected with the signal line at shunt both ends, collection module motherboard 22 is used for gathering the voltage signal at shunt both ends, and collection module motherboard 22 transmits the voltage signal who gathers for collection module 10, installs N collection module 10 on the collection module motherboard 22, collection module 10 be used for with voltage signal converts light signal into, transmits light signal for merging unit through optical fiber 14, optical fiber splice 15, optical fiber splice box 18 and the optical cable on the optical fiber adapter flange 16 that link to each other in proper order, and the signal that the merging unit analysis obtained passes to equipment power station backstage measurement and protection system use again with the electric current data that the analysis obtained. Wherein, N is a positive integer greater than or equal to 1, and the value of N can be configured according to the user needs, and is generally 4-10.
Optionally, the collection module 10 is powered by laser via a laser board card of the merging unit. The fiber adapter flange 16 may be plugged with the fiber connector 15 to transmit optical signals and laser energy.
The working principle of the current measuring device in this embodiment is shown in fig. 2.
In practical applications, the collection module motherboard 22 may be a PCB, the PCB is provided with a signal input port of a splitter, and the PCB is provided with a signal distribution circuit, the distribution circuit is connected to the collection modules 10, so that the input signal of the splitter can be transmitted to the collection modules 10.
The merging unit can collect and process signals of a plurality of current measuring devices, is an intermediate interface device of the current measuring devices and a background metering and protecting system, realizes data sharing and digitization to a certain extent, is a data source of a digital transformer substation conforming to the IEC61850 standard, and outputs digital information to secondary protection equipment and measurement and control equipment by completing synchronous acquisition of current and voltage signals.
It should be noted that, the second conductor 8 provides an installation space for the acquisition module 10 while playing a role of current flowing, so that the integration level is high, the overall occupied space of the device is saved, and a better electromagnetic shielding effect is achieved.
In addition, the collection module 10 is arranged in the second conductor 8, so that the installation space is saved, the electric field uniformity of the metal closed structure is not influenced, and the second conductor 8 is generally cylindrical and is grooved along the circumferential surface of the cylinder, so that the heat dissipation is facilitated.
The first metal shell 6 is further provided with an inflation connector 20, and the inflation connector 20 is used for filling insulating gas into the closed gas chamber, so that the first metal shell 6 and the plurality of conductors, the shunt 7 and the voltage collector in the first metal shell 6 are in an insulating state.
In this embodiment, the first insulating basin 4, the second insulating basin 24 and the first metal shell 6 form a closed air chamber, and the shunt 7 and the voltage collector are located in the closed air chamber, so that the shunt 7 and the voltage collector can be isolated from the external environment. Moreover, the first metal shell 6 is made of metal materials, so that the pollution corrosion in the environment can be avoided, and besides the closed air chamber replaces the existing composite insulator to enable the plurality of conductors, the shunt 7 and the voltage collector in the first metal shell 6 and the first metal shell 6 to be in an insulating state, the size of the device is reduced, the applicability is wider, and the use cost is reduced.
Alternatively, referring to fig. 1, the gas-filled junction 20 may also be connected to a gas densitometer 21, and the gas densitometer 21 measures the amount of insulating gas injected during the injection of the insulating gas into the gas chamber through the gas-filled junction 20. The amount of the insulating gas charged in the gas chamber is determined by observing the value of the gas densitometer 21. And stopping injecting the insulating gas when the inflation quantity of the insulating gas injected into the gas chamber reaches a rated value.
Optionally, in order to ensure the sealing property, the first central conductor 3 and the first insulating basin 4 are combined together by casting, so that the sealing property is good, and the mechanical strength and the electrical performance are high. Similarly, the second center conductor 23 and the second insulating cup 24 are also assembled by casting.
Optionally, a shielding cylinder 11 is installed on the second conductor 8, the shielding cylinder 11 covers the first conductor 5, the shunt 7 and the second conductor 8, edges and chamfers can be shielded, an electric field is uniform, currents of all conducting parts flowing through are stable, the electric field between the conducting parts and the first metal shell 6 is uniform, the local electric field strength is reduced, the local discharge capacity is reduced, and the anti-interference capability of the acquisition module 10 is improved. Wherein the conductive members comprise a first central conductor 3, a first conductor 5, a shunt 7, a second conductor 8, a third conductor 13 and a second central conductor 23.
Optionally, the contact surfaces of the first central conductor, the second central conductor, the first conductor, the second conductor and the third conductor are silver-plated surfaces. Such a design can reduce contact resistance and heat generation.
Optionally, the current measuring apparatus, referring to fig. 1, further includes:
and a second metal case 19 mounted on the outside of the first metal case 6.
And the optical fiber fusion box 18 is arranged inside the second metal shell 19, one end of the optical fiber fusion box 18 is connected with the voltage collector through the optical fiber interface 15 on the optical fiber adapter flange 16, and the other end of the optical fiber fusion box is connected with the merging unit through an optical fiber.
Specifically, the optical fiber adapter flange 16 is disposed on the second metal housing 19, so as to realize the fixed connection between the first metal housing 6 and the second metal housing 19. The fiber optic adapter flange 16 also provides isolation between the second metal housing 19 and the enclosed air space within the first metal housing 6. Furthermore, the optical fiber adapter flange 16 and the second metal shell 19 also form a closed space for disposing the optical fiber splice tray 18, which can protect the optical fiber splice tray 18.
Alternatively, the second metal housing 19 may be a junction box, as shown in fig. 1, and the junction box may be fixed to the first metal housing 6 by bolts or the like. Typically, the junction box is fixed outside the first metal housing 6.
The embodiments in the present specification are described in a progressive manner, and the same and similar parts among the embodiments are referred to each other, and each embodiment focuses on the differences from the other embodiments. In particular, the system or system embodiments are substantially similar to the method embodiments and therefore are described in a relatively simple manner, and reference may be made to some of the descriptions of the method embodiments for related points. The above-described system and system embodiments are only illustrative, wherein the units described as separate parts may or may not be physically separate, and the parts displayed as units may or may not be physical units, may be located in one place, or may be distributed on a plurality of network units. Some or all of the modules may be selected according to actual needs to achieve the purpose of the solution of the present embodiment. One of ordinary skill in the art can understand and implement it without inventive effort.
Those of skill would further appreciate that the various illustrative elements and algorithm steps described in connection with the embodiments disclosed herein may be implemented as electronic hardware, computer software, or combinations of both, and that the various illustrative components and steps have been described above generally in terms of their functionality in order to clearly illustrate this interchangeability of hardware and software. Whether such functionality is implemented as hardware or software depends upon the particular application and design constraints imposed on the implementation. Skilled artisans may implement the described functionality in varying ways for each particular application, but such implementation decisions should not be interpreted as causing a departure from the scope of the present invention.
The previous description of the disclosed embodiments is provided to enable any person skilled in the art to make or use the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the invention. Thus, the present invention is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.
Claims (10)
1. A current measuring device, comprising:
a first metal housing;
the first insulating basin and the second insulating basin are connected with the first metal shell;
the first central conductor, the first conductor, the shunt, the second conductor, the third conductor and the second central conductor of the second insulating basin are arranged in the first metal shell and are sequentially connected;
the voltage collector is arranged in the first metal shell and connected with the shunt, and is used for measuring a voltage signal of the shunt;
and the inflation joint is used for filling insulating gas into a closed gas chamber formed by the first insulating basin, the second insulating basin and the first metal shell, so that the first metal shell, the first central conductor, the first conductor, the shunt, the second conductor, the third conductor and the second central conductor are in an insulating state.
2. The current measurement device of claim 1, wherein the voltage harvester comprises:
the acquisition module mother board is connected with the signal line at the two ends of the shunt, the acquisition module mother board is used for acquiring voltage signals at the two ends of the shunt, N acquisition modules are installed on the acquisition module mother board and used for converting the voltage signals into optical signals, and N is a positive integer greater than or equal to 1.
3. The current measuring device of claim 2, wherein the collection module is laser powered by a laser board card of the merging unit.
4. The current measuring device of claim 1, further comprising:
a shield can mounted on the second conductor, the shield can capable of housing the first conductor, the shunt, and the second conductor.
5. The current measuring device of claim 1, further comprising:
a second metal shell mounted outside the first metal shell;
and one end of the optical fiber fusion box is connected with the voltage collector through an optical fiber interface on the optical fiber adapter flange, and the other end of the optical fiber fusion box is connected with the merging unit through an optical fiber.
6. The current measuring device of claim 5, wherein the second metal housing comprises a junction box.
7. The current measurement device of claim 1, wherein the voltage harvester is disposed inside the second conductor.
8. The current measuring device of claim 1, wherein the first conductor, the shunt, and the second conductor are connected by a screw and nut.
9. The current measuring device of claim 1, wherein a gas density meter is further connected to the gas-filled junction.
10. The current measuring device of any one of claims 1-9, wherein the contact surfaces of the first central conductor, the second central conductor, the first conductor, the second conductor, and the third conductor are all silver plated surfaces.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811061850.7A CN110895289A (en) | 2018-09-12 | 2018-09-12 | Current measuring device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811061850.7A CN110895289A (en) | 2018-09-12 | 2018-09-12 | Current measuring device |
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| Publication Number | Publication Date |
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| CN110895289A true CN110895289A (en) | 2020-03-20 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201811061850.7A Pending CN110895289A (en) | 2018-09-12 | 2018-09-12 | Current measuring device |
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Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5446372A (en) * | 1993-07-06 | 1995-08-29 | General Electric Company | Noninductive shunt current sensor with self-power capability |
| CN102445582A (en) * | 2011-11-18 | 2012-05-09 | 国电南瑞科技股份有限公司 | Primary current sensor structure suitable for high-voltage direct current measurement |
| CN102928641A (en) * | 2012-10-31 | 2013-02-13 | 南京江北自动化技术有限公司 | Electronic current transformer |
| CN205943628U (en) * | 2016-08-12 | 2017-02-08 | 宜昌恒源科技有限公司 | Pot -type zero clearance metal oxide double containment arrester |
| CN206431194U (en) * | 2016-12-23 | 2017-08-22 | 中国西电电气股份有限公司 | A kind of direct current hybrid measurement device |
| CN207116204U (en) * | 2017-05-25 | 2018-03-16 | 浙江天际互感器有限公司 | A kind of electronic type voltage transformer of compound inslation |
-
2018
- 2018-09-12 CN CN201811061850.7A patent/CN110895289A/en active Pending
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5446372A (en) * | 1993-07-06 | 1995-08-29 | General Electric Company | Noninductive shunt current sensor with self-power capability |
| CN102445582A (en) * | 2011-11-18 | 2012-05-09 | 国电南瑞科技股份有限公司 | Primary current sensor structure suitable for high-voltage direct current measurement |
| CN102928641A (en) * | 2012-10-31 | 2013-02-13 | 南京江北自动化技术有限公司 | Electronic current transformer |
| CN205943628U (en) * | 2016-08-12 | 2017-02-08 | 宜昌恒源科技有限公司 | Pot -type zero clearance metal oxide double containment arrester |
| CN206431194U (en) * | 2016-12-23 | 2017-08-22 | 中国西电电气股份有限公司 | A kind of direct current hybrid measurement device |
| CN207116204U (en) * | 2017-05-25 | 2018-03-16 | 浙江天际互感器有限公司 | A kind of electronic type voltage transformer of compound inslation |
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Application publication date: 20200320 |