CN101696989A - Current measurement device of alternating current under ultra-high voltage environment - Google Patents
Current measurement device of alternating current under ultra-high voltage environment Download PDFInfo
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- CN101696989A CN101696989A CN200910211546A CN200910211546A CN101696989A CN 101696989 A CN101696989 A CN 101696989A CN 200910211546 A CN200910211546 A CN 200910211546A CN 200910211546 A CN200910211546 A CN 200910211546A CN 101696989 A CN101696989 A CN 101696989A
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Abstract
The invention discloses a current measurement device of an alternating current under an ultra-high voltage environment, comprising a compensating coil used for compensating induced voltage loss at a C-shaped coil gap; an induced voltage is acquired by carrying an even printed circuit, meanwhile, a processing display circuit is shielded, thereby the measurement device is used for measuring the volume of the alternating current carried by a wire without damaging or cutting off a conductor cable and has high measurement accuracy and low influence from an electromagnetic environment.
Description
(1) technical field
The present invention relates to a kind of current measurement device of alternating current under ultra-high voltage environment, it comprises supporting plate, and the one end has the inlet slot of the C shape that is used for the energized conductor embedding, and the other end is the connecting portion of attended operation instrument; Main coil is a coil that is fixed on the C shape on this part plate face corresponding to described inlet slot setting; The processes and displays circuit, the current value that the induced current that comprises described main coil generation is handled to obtain energized conductor also shows.
(2) background technology
The overpressured zones electric conductor often need the size to its alternating current be measured under the situation of not damaging or cut off conductor.Traditional mode is to adopt a jaw type AC current sensor to carry out DATA REASONING, this jaw type AC current sensor mainly is made up of an alternating current instrument that is connected to the magnetic-core type current transformer, and the magnetic core of alternating current transformer is made of one or more moveable parts in this measurement mechanism, when this makes in the process of carrying out current measurement, magnetic core must be opened, closed afterwards, so that magnetic core can be fully around conductor.A shortcoming of this AC current sensor is in order to make its operate as normal, must have a mechanical hook-up to come the open and close magnetic core, and in order to obtain accurately measurement result, must reduce the size of magnetic core air gap as far as possible; The another one shortcoming is, its magnetic core fragility very, such as very easily damage ferritic the time making.
No. 87207323 utility model patent of China discloses a kind of current range selector switch that comprises, the High Level AC Voltage on-line measurement device of reading indicator, it has adopted a kind of jaw that closing device need not be set that is different from tong-type ammeter, and this jaw is in open configuration all the time.Can in order to direct test below 35 kilovolts on the high-tension line in line current, belong to the higher-pressure region, but still lower comparatively speaking.The preferred embodiment of this patent specifically discloses its employed harvester and has remained the coil that has iron core, and the external connection of this coil passes from the coil outside, is connected to then on its treatment circuit and the sampling hold circuit.Have iron core will inevitably produce because electric current is excessive saturated, the poor linearity of measurement result, measurement result is inaccurate.Be not easy to generate electromagnetic interference (EMI) if exterior shield is not carried out in external cabling, frequency band is also narrow, and measuring accuracy is poor.Because its coil that is used to produce induced current does not form a primary coil that is equivalent to the tested energized conductor of encirclement of current transformer, its measurement data itself just has deviation with actual current value in addition.
(3) summary of the invention
The present invention is in order to overcome the above-mentioned defective of prior art, a kind of current measurement device of alternating current under ultra-high voltage environment is provided, it can under the situation of not damaging or cut off conductor cable, measure lead with the size of alternating current, and measurement accuracy height, it is little influenced by electromagnetic environment.
The present invention is by the following technical solutions:
This invention current measurement device of alternating current under ultra-high voltage environment comprises:
Supporting plate, one end have the inlet slot of the C shape that is used for the energized conductor embedding, and the other end is the connecting portion of attended operation instrument;
Main coil is a coil that is fixed on the C shape on this part plate face corresponding to described inlet slot setting;
The processes and displays circuit, the current value that the induced current that comprises described main coil generation is handled to obtain energized conductor also shows;
Compensating coil is fixed on to axis normal the upper arm of the described inlet slot of structure and the end of underarm, and the extended line of described axis process center, described main coil end, and two compensating coil tip spacing G are used for entering described inlet slot to electric conductor;
P.e.c., be printed in the reverse side of described main coil fixed head face, be used for described main coil, compensating coil is connected with described processes and displays circuit, wherein main coil is an air core coil, and an end of its coiling passes that main coil is hollow to be run through described supporting plate with the other end and be electrically connected with described P.e.c.; Described supporting plate is run through by described P.e.c. serial connection in the termination of two compensating coils; And
Shielding box, be arranged on the plate face of described supporting plate connecting portion zone printed circuit board (PCB), be used for the shielding of described processes and displays circuit, this processes and displays circuit comprises and is used for the compensating circuit that described main coil is connected with compensating coil, is used to compensate the loss of C shape coil barbed portion induced potential.
The main coil structure that has had opening for the convenience of using has adopted according to the current measurement device of alternating current under ultra-high voltage environment of technical solution of the present invention, can under the situation of not damaging or cut off conductor cable, measure lead and be with the AC current size, certain said main coil does not make up the ring that surrounds measured conductor, in order to compensate the part of main coil opening disappearance, this programme has adopted the compensating coil structure that is arranged on the main coil end, thereby can guarantee in practical and convenient, can guarantee the requirement that measurement accuracy is high.For said compensating coil, the extended line of its axis is through center, described main coil end, and this is to guarantee that compensating coil can play the necessary condition of compensating action.
On the other hand, in order to improve the precision of measurement, prevent the interference of external electromagnetic environment, described main coil is an air core coil, to reduce magnetic saturation, simultaneously also for its wiring provides passage, plays the self-shileding effect, and structure is also relatively compact.
Above-mentioned current measurement device of alternating current under ultra-high voltage environment, described main coil both ends of the surface centre distance G2 and two compensating coil electrical centres are 1.1～10.0 apart from the ratio of G1.
Above-mentioned current measurement device of alternating current under ultra-high voltage environment, described main coil both ends of the surface centre distance G2 and two compensating coil electrical centres are 1.1～3.0 apart from the ratio of G1.
Above-mentioned current measurement device of alternating current under ultra-high voltage environment, described main coil both ends of the surface centre distance G2 and two compensating coil electrical centres apart from the ratio of G1 are
Above-mentioned current measurement device of alternating current under ultra-high voltage environment, described main coil both ends of the surface centre distance
In the formula: Nc refers to the number of turns (two compensating coils are just the same) of single compensating coil, and Ac is the average coiling area of compensating coil, the Nm number of turn of circle on the unit length of serving as theme, the serve as theme average coiling area of circle of Am.
Above-mentioned current measurement device of alternating current under ultra-high voltage environment is characterized in that: described compensating coil embeds the fixed block that is fixed on described inlet slot end, and the opposite end of two compensating coils is positioned at outside the described fixed block; Described fixed block has the end holes that is used to embed the main coil end at described main coil end position.
Above-mentioned current measurement device of alternating current under ultra-high voltage environment, described fixed block also are provided with the through wires hole that main coil can be passed by main coil coiling in the main coil inboard.
Above-mentioned current measurement device of alternating current under ultra-high voltage environment, described main coil and compensating coil separately two coiling wiring before passing described supporting plate partly are to twist around together.
Above-mentioned current measurement device of alternating current under ultra-high voltage environment, described printed circuit board (PCB) comprise the screening wire of the shielding of the connecting circuit from the splicing ear that passes supporting plate to the printing of shielding box, wherein are provided with a grid line between each bar connecting circuit at least.
Above-mentioned current measurement device of alternating current under ultra-high voltage environment, described compensating circuit are reactive power compensation circuit.
(4) description of drawings
Below in conjunction with Figure of description technical scheme of the present invention is further described, makes those skilled in the art better understand this, wherein:
Fig. 1 is the perspective view of current measurement device of alternating current under ultra-high voltage environment in the embodiment of the invention.
Fig. 2 is the layout architecture synoptic diagram of current measurement device of alternating current under ultra-high voltage environment in the inventive embodiments.
Fig. 3 is a following compensating coil structural representation in the embodiment of the invention.
Fig. 4 goes up the compensating coil structural representation in the embodiment of the invention.
Among the figure: 1, set bolt, 2, chuck, 3, the chuck connector, 4, connecting portion, 5, otic placode, 6, supporting plate, 7, main coil, 9, underarm, 10, band, 11, port, 12, terminal, 13, the end, 14, fixed block, 15, screw, 16, following compensating coil, 17, terminal, 18, terminal, 19, upper arm, 20, screw, 21, last compensating coil, 22, fixed block, 23, the end, 24, terminal, 25, terminal, 26, inlet slot, 27, the termination, 28, shielding box, 29, indicator panel, 30, switch, 31, limited block, 32, end holes, 33, coiling, 34, through wires hole, 35, the compensating coil coiling, 36, the compensating coil coiling, 37, end holes, 38, limited block.
(5) embodiment
Figure of description 1 to 4 shows a kind of current measurement device of alternating current under ultra-high voltage environment, comprising:
Supporting plate 6, one end have the inlet slot (26) of the C shape that is used for the energized conductor embedding, and the other end is the connecting portion of attended operation instrument;
The processes and displays circuit, the current value that the induced current that comprises described main coil generation is handled to obtain energized conductor also shows;
Compensating coil is fixed on to axis normal the upper arm 19 of the described inlet slot of structure and the end of underarm 9, and the extended line of described axis process 13,23 centers, described main coil end, and two compensating coil tip spacing G are used for entering described inlet slot to electric conductor;
P.e.c., be printed in the reverse side of described main coil fixed head face, be used for described main coil, compensating coil is connected with described processes and displays circuit, wherein main coil is an air core coil, and its coiling end of 33 passes that main coil is hollow to be run through described supporting plate with the other end and be electrically connected with described P.e.c.; Described supporting plate is run through by described P.e.c. serial connection in the termination of two compensating coils; And
The fixture of said supporting plate and compensating coil, coil or fixed sturcture need adopt insulating material to make, and fixing such as main coil can adopt Plastic Bandage to carry out colligation or be stuck on the described supporting plate with fastener.
The measuring flume of space between upper arm and the underarm when measuring, promptly said inlet slot, its minimum constructive height are that because in the measurement of carrying out, energized conductor will be put in the inlet slot earlier by the size decision of the conductor that has maximum current.The minimum length of the measuring flume of supporting plate is by tested hum bar electric conductor and said two compensating coil tip spacing G decision, and enough spaces can obtain good taking measurement of an angle, and then improves measuring accuracy.Need consider gap between inlet slot and the energized conductor to make this gap as much as possible little at this, to guarantee accuracy of measurement.
For said processes and displays circuit, except the necessary circuitry of compensating circuit part and corresponding P.e.c. part, remainder adopts the circuit the same with prior art, and wherein processing section conductively-closed is to guarantee the consistance of measurement structure.
Connecting portion is mainly used to the attended operation instrument, and such as connecting the insulating bar that the staff of power plant uses, the otic placode 5 that described connecting portion can be configured to give prominence to is fixed a chuck connector 3 that has a chuck 2 on this otic placode.Can also adopt the simplest socket mode, promptly insulating bar is provided with axle or hole, mates and carries out simple and easy the connection with hole or axle on being arranged on connecting portion.
Described main coil both ends of the surface centre distance G2 and two compensating coil electrical centres are preferred apart from the ratio of G1
, wherein said electrical centre refers to the coil axis mid point.The offset that compensating coil provides not is perfect, because the induction electromotive force of the lost part generation of compensating coil (going up compensating coil 21 and following compensating coil 15) induction electromotive force that produces and the main coil that extends through G2 is differentiated after all, this difference is called " compensating error ".Compensating error increases and reduces along with the space between G1 and the tested hum bar electric conductor, the space that G1 and the minor increment conduct between the hum bar electric conductor that is placed in the supporting plate inlet slot can be measured.In addition, generally speaking, along with the increase in the space between G1 and the measured conductor, the voltage that the hum bar electric conductor that is placed on the inlet slot outside that main coil and compensating coil obtain produces reduces.
Therefore when selecting G2 and G1, to note making their ratio to equal
This be because, generally speaking, this ratio compensating error along with the size of the distance of G1 reduce the fastest.Also have to be exactly when their ratio is this value, can both to accomplish minimum for the size of any specific current measurement device of alternating current under ultra-high voltage environment with desirable measuring accuracy.In addition, under this ratio to the inhibition of external interference signals with the increase of clearance G 1 distance change the fastest.
As mentioned above, G2 and G1 are
It doubly is preference value.But the ratio of G2 and G1 is an a series of number between 1.1 and 10.0 in the practical application, even bigger, all can obtain measuring accuracy preferably in this scope.But should be as much as possible with it between to 1.1 to 3.0, the one, the compensation effect of compensating coil is better.When carrying out the ratio selection, be with the precision of measurement result, the minimum dimension that external signal inhibition degree and AC current sensor are desired.In case these parameters have determined that the optimal ratio of G2 and G1 just can be decided by the method for mathematical approach estimation or conventional test so.
Described main coil both ends of the surface centre distance
In the formula: Nc refers to the number of turns (two compensating coils are just the same) of single compensating coil, and Ac is the average coiling area of compensating coil, the Nm number of turn of circle on the unit length of serving as theme, the serve as theme average coiling area of circle of Am.The coiling area is meant under situation about facing, the complete shared closed region of coiling of a circle on the coil.Average coiling area (Am) is meant the mean value in the coiling zone of one group of coiling on the coil.If the coiling of the homalographic on the coil, and have only one deck, Rao Xian average area (Am) just equals the coiling area of coil so.Though as above said, the individual pen coiling is preferably adopted in the main coil coiling, as long as the area coil that each layer gone up on the coil unit length is identical with coil turn, can adopt multilayer winding so.For any given main coil, if its bending is clearly, may the unitarity of the number of turns of 33 mean turn area or the per unit length coiling line that winds the line be impacted, main coil should be done length so, and the mean turn area of coiling should be littler.In general, the mean turn area of coiling is more little, be subjected at main coil violent when crooked, more little to the influence that the coil quantity of mean turn area and per unit length causes.
The number of turn area of per unit length main coil must be enough big, and a certain scope measurement mechanism of She Ji measurement could obtain enough induction electromotive forces from the hum bar electric conductor like this.By rule of thumb, measure in the minimum electric current process, the signal that the needed number of turn area of main coil per unit length is provided must substantially exceed the intrinsic noise voltage of measurement mechanism amplifier.Just can not obtain enough induction electromotive forces if the number of turn area of main coil per unit length is too little.
Described compensating coil embeds the fixed block 14,22 that is fixed on described inlet slot end, and the opposite end of two compensating coils is positioned at outside the described fixed block; Described fixed block has the end holes 32,37 that is used to embed the main coil end at described main coil end position, and end holes can be fixed main coil, and its fixing main coil termination and position ratio of compensating coil of can also making is easier to determine and the location.For the location of main coil, limited block 31,38 can be set in end holes, when inserting, main coil can obtain reasonable bearing accuracy.Wherein said fixed block can stick with glue on supporting plate, and the screw that can also adopt insulating material to make is fixed.The screw that said compensating coil can adopt insulating material to make directly is fixed on the fixed head.
For the ease of the cabling of main coil coiling, described fixed block also be provided with the through wires hole 34 that main coil can be passed by the main coil coiling in the main coil inboard.Certainly the wiring of main coil has only one wiring need pass through its center pit, as if that through wires hole all is set is improper for two fixed blocks, in fact, for the convenience of making, is provided with like this to save and makes and installation cost.
The bigger noise of generation when passing supporting plate in order to reduce wiring, described main coil and compensating coil separately two coiling wiring before passing described supporting plate partly are to twist around together.
In order to reduce the noise that part produced of connecting circuit, described printed circuit board (PCB) comprises the screening wire from the splicing ear that passes supporting plate to the connecting circuit shielding of the printing of shielding box, wherein is provided with a grid line between each bar connecting circuit at least.As long as enough shielding actions can be provided, the concrete shape and the actual form of screening wire are inessential comparatively speaking.
Described compensating circuit is a reactive power compensation circuit.
Claims (10)
1. current measurement device of alternating current under ultra-high voltage environment comprises:
Supporting plate (6), one end have the inlet slot (26) of the C shape that is used for the energized conductor embedding, and the other end is the connecting portion of attended operation instrument;
Main coil (7) is a coil that is fixed on the C shape on this part plate face corresponding to described inlet slot setting;
The processes and displays circuit, the current value that the induced current that comprises described main coil generation is handled to obtain energized conductor also shows;
It is characterized in that it also comprises:
Compensating coil, be fixed on to axis normal the upper arm (19) of the described inlet slot of structure and the end of underarm (9), and the extended line of described axis is through center, described main coil end (13,23), and two compensating coil tip spacing G are used for entering described inlet slot to electric conductor;
P.e.c., be printed in the reverse side of described main coil fixed head face, be used for described main coil, compensating coil is connected with described processes and displays circuit, wherein main coil is an air core coil, and an end of its coiling (33) passes that main coil is hollow to be run through described supporting plate with the other end and be electrically connected with described P.e.c.; Described supporting plate is run through by described P.e.c. serial connection in the termination of two compensating coils; And
Shielding box (28), be arranged on the plate face of described supporting plate connecting portion zone printed circuit board (PCB), be used for the shielding of described processes and displays circuit, this processes and displays circuit comprises and is used for the compensating circuit that described main coil is connected with compensating coil, is used to compensate the loss of C shape coil barbed portion induced potential.
2. current measurement device of alternating current under ultra-high voltage environment according to claim 1 is characterized in that: described main coil both ends of the surface centre distance G2 and two compensating coil electrical centres are 1.1～10.0 apart from the ratio of G1.
3. current measurement device of alternating current under ultra-high voltage environment according to claim 2 is characterized in that: described main coil both ends of the surface centre distance G2 and two compensating coil electrical centres are 1.1～3.0 apart from the ratio of G1.
4. current measurement device of alternating current under ultra-high voltage environment according to claim 3 is characterized in that: described main coil both ends of the surface centre distance G2 and two compensating coil electrical centres apart from the ratio of G1 are
5. current measurement device of alternating current under ultra-high voltage environment according to claim 4 is characterized in that: described main coil both ends of the surface centre distance
In the formula: Nc refers to the number of turns (two compensating coils are just the same) of single compensating coil, and Ac is the average coiling area of compensating coil, the Nm number of turn of circle on the unit length of serving as theme, the serve as theme average coiling area of circle of Am.
6. according to the described current measurement device of alternating current under ultra-high voltage environment of one of claim 1 to 5, it is characterized in that: described compensating coil embeds the fixed block (14,22) that is fixed on described inlet slot end, and the opposite end of two compensating coils is positioned at outside the described fixed block; Described fixed block has the end holes (32,37) that is used to embed the main coil end at described main coil end position.
7. current measurement device of alternating current under ultra-high voltage environment according to claim 6 is characterized in that: described fixed block also is provided with the through wires hole (34) that main coil can be passed by main coil coiling in the main coil inboard.
8. current measurement device of alternating current under ultra-high voltage environment according to claim 7 is characterized in that: described main coil and compensating coil separately two coiling wiring before passing described supporting plate partly are to twist around together.
9. current measurement device of alternating current under ultra-high voltage environment according to claim 8, it is characterized in that: described printed circuit board (PCB) comprises the screening wire of the shielding of the connecting circuit from the splicing ear that passes supporting plate to the printing of shielding box, wherein is provided with a grid line between each bar connecting circuit at least.
10. current measurement device of alternating current under ultra-high voltage environment according to claim 9 is characterized in that: described compensating circuit is a reactive power compensation circuit.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN200910211546A CN101696989A (en) | 2009-10-30 | 2009-10-30 | Current measurement device of alternating current under ultra-high voltage environment |
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| Application Number | Priority Date | Filing Date | Title |
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| CN200910211546A CN101696989A (en) | 2009-10-30 | 2009-10-30 | Current measurement device of alternating current under ultra-high voltage environment |
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| CN101696989A true CN101696989A (en) | 2010-04-21 |
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| CN200910211546A Pending CN101696989A (en) | 2009-10-30 | 2009-10-30 | Current measurement device of alternating current under ultra-high voltage environment |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2013063773A1 (en) * | 2011-11-02 | 2013-05-10 | Honeywell International Inc. | Devices and methods for sensing current |
| CN113533817A (en) * | 2021-07-19 | 2021-10-22 | 武汉盛帆电子股份有限公司 | Electronic voltage transformer and electric energy metering equipment thereof |
-
2009
- 2009-10-30 CN CN200910211546A patent/CN101696989A/en active Pending
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2013063773A1 (en) * | 2011-11-02 | 2013-05-10 | Honeywell International Inc. | Devices and methods for sensing current |
| US9562931B2 (en) | 2011-11-02 | 2017-02-07 | Honeywell International Inc. | Devices and methods for sensing current |
| CN113533817A (en) * | 2021-07-19 | 2021-10-22 | 武汉盛帆电子股份有限公司 | Electronic voltage transformer and electric energy metering equipment thereof |
| CN113533817B (en) * | 2021-07-19 | 2022-08-12 | 武汉盛帆电子股份有限公司 | Electronic voltage transformer and electric energy metering equipment thereof |
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Open date: 20100421 |