CN202443855U - Comprehensive conditioning module for squirrel-cage hollow current transformer - Google Patents
Comprehensive conditioning module for squirrel-cage hollow current transformer Download PDFInfo
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- CN202443855U CN202443855U CN2012200381245U CN201220038124U CN202443855U CN 202443855 U CN202443855 U CN 202443855U CN 2012200381245 U CN2012200381245 U CN 2012200381245U CN 201220038124 U CN201220038124 U CN 201220038124U CN 202443855 U CN202443855 U CN 202443855U
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Abstract
The utility model provides a comprehensive conditioning module for a squirrel-cage hollow current transformer. The comprehensive conditioning module comprises an input protection circuit, an input conversion circuit, a low-pass filtering circuit, an adjustable phase shift circuit, a gain adjusting circuit and an output conversion circuit which are electrically connected in turn. The comprehensive conditioning module can be matched with the squirrel-cage hollow current transformer to perform signal conditioning, and can be used for measuring the short-network current of the high-power smelting equipment such as an ore furnace, a steel furnace and the like; normally, the signal amplitude limiting link does not function; and once the spike voltage exceeds the protection value, the protection link acts immediately.
Description
Technical field
The utility model relates to a kind of comprehensively regulating module that is used for the squirrel-cage air-core current transformer.Squirrel-cage air-core current transformer wherein is based on electromagnetic induction principle and a current measurement instrument transformer that designs; Measuring range is wide, measurement electric current big (from several amperes to hundreds thousand of amperes), is mainly used in the measurement of the short net of high-power smelting equipment such as the hot stove in (but being not limited to) ore deposit, converter electric current.
Background technology
The soft Luo-coil of available technology adopting has been shown among Fig. 1; It is that enamelled wire is wound on the skeleton of soft nonmagnetic substance; Let high-current conductor to be measured pass its geometric center and carry out current measurement; Because do not comprise magnetic core, do not have the magnetic saturation problem, so measuring range is wide, the linearity is good.Processing with use in require loop density constant (axial distribution is even), coil section is long-pending and shape is consistent, coil section is vertical with center line as far as possible.Owing to be soft coil, have very strong construction convenience, therefore extensively adopted.
But, many shortcomings below the soft Luo-coil among Fig. 1 also exists:
When producing Luo-coil, as adopt craft or semi-hand technique for coiling, be difficult to guarantee that the sectional area of coiling is identical and along the uniformity of skeleton axial distribution, this will bring measure error;
When adopting high-precision numerical control winding apparatus to reel, can guarantee the accuracy of winding process itself preferably, but soft skeleton easy deformation, the coil section shape of twining on it changes easily, and this causes measure error;
Be easy to generate wriggling between coil and skeleton, the tractive and the bending of coil can cause the coil relative position to change in installing and the use, have destroyed uniform coil distribution property, and this has increased measure error;
Mechanical strength is low, and in installing and the use, extruding can cause coil section even coil rack distortion, usually causes permanent deformation even damage, and this increases measure error and has reduced reliability;
Soft skeleton and outer layer protection are relatively poor with the temperature characterisitic of soft rubber, easy ageing, and sensor reliability reduces; Coil section is little, and induced electricity forces down, output signal a little less than, anti-electromagnetic interference capability is poor;
Opening is bigger, causes coil distribution uneven, exists systematic eccentric error to realize the technological means relative complex of electromagnetic shielding; Coil almost can't be repaired after damaging, and application cost is high, and processing request is high, and production cost is high.
In addition, also have a kind of hard PCB formula coil in the prior art, it adopts two-sided PCB based on method for designing and the accurate processing technology of PCB, and the wiring on the two sides is connected in series with via hole, thereby generates the equivalent coil based on printed conductor.As shown in Figure 2, solid line and dotted line are represented top layer and the bottom of PCB respectively among the figure.
Hard PCB formula coil has been abandoned many inherent defects of soft Luo-coil on the basis that has kept the essential advantage that soft Luo-coil measuring range is wide, height is linear, be applied in some occasions.But still there is following weak point in it:
The thickness deviation of same batch PCB base material seldom can accomplish below 1%, and is high even can reach 10%; In uneven thickness with a slice PCB; There is discreteness in the PCB thickness of different batches; More than three kinds of in esse situations cause coil section long-pending inequality, the mutual inductance parameter is inconsistent, accurately measuring must be to different that individual coil is carried out the systematicness adjustment or the demarcation of otherness;
The PCB base material is acted upon by temperature changes and shows that mainly base material thickness changes, and this causes the mutual inductance parameter to change equally;
Need high-density wiring in order to increase coil turn, so the quantity of PCB via hole is big, via size is little, this has increased the failure rate of transducer; Same problem because of number of vias and via size, this structure is difficult to realize multiple-plate application;
Receive the influence of wire pitch, there is the non-uniform phenomenon of opening part loop density in the application of pincerlike connecting method, influences certainty of measurement;
Receive the influence of sheet metal thickness, the area of single turn necklace is difficult to do greatly, is unfavorable for improving the sensitivity of measurement;
Electric or mechanical damage causes scrapping of whole sensor easily, and the technical difficulty of maintenance is higher.
In sum, be necessary to develop a kind of novel current transformer and the comprehensively regulating module that is used for the squirrel-cage air-core current transformer, overcome the said problem that exists in the prior art.
The utility model content
In order to overcome at least one deficiency or defective in the prior art, a purpose of the utility model provides a kind of comprehensively regulating module that is used for the squirrel-cage air-core current transformer.Particularly; Realize through following technical scheme: a kind of comprehensively regulating module that is used for the squirrel-cage air-core current transformer is characterized in that comprising the input protection circuit, input change-over circuit, low-pass filter circuit, adjustable phase-shift circuit, gain adjusting circuit and the output conversion circuit that are electrically connected successively.
According to the utility model on the other hand, said comprehensively regulating module also comprises 24 volts of DC power supplys.
The utility model compared with prior art has one or more following advantage:
Can with the supporting signal condition that carries out of squirrel-cage air-core current transformer, can be used for the current measurement of the short net of high-power smelting equipment such as the hot stove in ore deposit, converter;
Under the normal condition, the signal limiter link is inoperative, in case the peak voltage of protection value occurs surpassing, this protection link is moved immediately.
Description of drawings
Fig. 1 is the structural principle sketch map of a kind of soft Luo-coil of the prior art.
Fig. 2 is the structural representation of a kind of hard PCB formula coil of the prior art.
Fig. 3 is a kind of squirrel-cage air-core current transformer sketch map according to the utility model preferred embodiment.
Fig. 4 is the another kind of squirrel-cage air-core current transformer sketch map according to the utility model preferred embodiment.
Fig. 5 is a kind of pcb board formula technical front sketch map according to the squirrel-cage air-core current transformer of the utility model preferred embodiment.
Fig. 6 is a kind of pcb board formula coil schematic rear view according to the squirrel-cage air-core current transformer of the utility model preferred embodiment.
Fig. 7 is a kind of comprehensively regulating module diagram that is used for the squirrel-cage air-core current transformer according to the utility model preferred embodiment.
Embodiment
Below in conjunction with accompanying drawing; The preferred forms of the utility model is described through preferred embodiment; The embodiment here is at length to explain the utility model, and should not be construed as the restriction to the utility model, under the situation of spirit that does not break away from the utility model and essential scope; Can make various distortion and modification, these all should be included within the protection range of the utility model.
Embodiment 1
The squirrel-cage air-core current transformer adopts based on the method for designing of PCB and accurate processing technology, with the PCB welding one of the different functions of multi-disc, forms the electric current detecting coil of an equivalence.
Referring to Fig. 3; Wherein show a kind of squirrel-cage air-core current transformer; Comprise the upper strata arc pcb board 2 and lower floor's arc pcb board 3 and a plurality of compartment of terrain along the circumferential direction and equally distributed pcb board formula coil 1 that laterally arrange; Wherein, said pcb board formula coil 1 is arranged between said upper strata arc pcb board 2 and the lower floor's arc pcb board 3, and vertical with lower floor arc pcb board 3 with said upper strata arc pcb board 2; The top and bottom of pcb board formula coil 1 are fixedly connected with lower floor arc pcb board 3 with said upper strata arc pcb board 2 respectively, and wherein said a plurality of pcb board formula coils 1 electrically are connected in series through said upper strata arc pcb board 2 or lower floor's arc pcb board 3.
Preferably, referring to Fig. 5-6, said pcb board formula coil 1 is rectangular pcb board formula coil.
Preferably, said pcb board formula coil 1 comprises a plurality of round rectangle coils 6, circular coil, oval coil or the involute shape coil that is provided with on the pcb board.Alternatively, pcb board formula coil 1 can adopt two-sided PCB structure, also can adopt the multi-layer PCB structure.Coil shape can be the round rectangle among the figure, also can be various ways such as circle, ellipse, involute property, and the shape and size of coil and the line of printed conductor footpath all can be regulated, thereby have great flexibility.
Preferably, said pcb board formula coil 1 comprises two-layer or lattice coil 6 more.Printed conductor (coil) two-layer or multilayer for example links to each other through the via hole 5 of middle upside among the figure, forms the complete coil that two pads 4 with pcb board formula coil 1 upper end are drawn end points.Two pads 4 of pcb board formula coil 1 lower end only fix or locate usefulness, and when otherwise realizing the location, it also can omit.
Preferably, said pcb board formula coil 1 comprises the pad 4 that is used to connect said upper strata arc pcb board 2 and lower floor's arc pcb board 3.
Preferably, said pcb board formula coil 1 comprises and is used to be electrically connected the via hole 5 between the adjacent layer coil 6 on this pcb board formula coil.
Preferably, referring to Fig. 4, said upper strata arc pcb board 2 is the semi-round ring shape pcb board with lower floor's arc pcb board 3.Shown in Fig. 4 is the two semicircular structure instrument transformers of a kind of opening mode, and two semi-round ring shape structural parameters are identical, all comprise up and down two be used to connect and fixing semi-round ring shape PCB and some along the equally distributed pcb board formula of semi-circumference coil.During use two members are stuck on the carrying object to be detected, with miniature connector two are carried out seamless splicedly, form a complete coil, signal is drawn from preset coil end.This structure is applicable to the directly carrying object current detecting occasion of suit of inconvenience.
Preferably, referring to Fig. 3, said upper strata arc pcb board 2 is the annular pcb board with lower floor's arc pcb board 3.Closed circular shown in Fig. 3 annular structure instrument transformer, comprise up and down two and be used to connect/fixedly usefulness annular PCB with several along the equally distributed PCB formula of circumference coil, signal is drawn from the coil end of presetting.This structure is applicable to the carrying object current detecting occasion of convenient direct suit.
Preferably, said pcb board formula coil 1 can comprise pcb board, via hole, pad and be arranged on the printed coil on the pcb board.Referring to Fig. 3-4, the direction that the upper end of this pcb board formula coil 1, lower end are fixed is all overlapping with the radial direction of annular/semi-round ring shape pcb board.
The squirrel-cage air-core current transformer of the utility model compared with prior art has one or more following advantage:
Coil adopts high-precision PCB production technology, and machining accuracy is high, the convenient batch process in batches, and application cost is low;
Size, the number of turn and the PCB number of plies that the changes coil sensitivity coil plane detected of regulating winding easily overcome the thickness deviation of PCB self and the thickness error that variations in temperature causes along perpendicular to the circle-shaped even distribution of the direction of the magnetic line of force;
The printed coil of different flaggies staggers in the direction position perpendicular to flaggy, reduces distributed capacitance, improves certainty of measurement; The equivalence number of turn is many, highly sensitive, output voltage is high, anti-electromagnetic interference capability is strong;
There is not opening part loop density non-uniform phenomenon in the application of pincerlike connecting method, and assembly unit does not influence certainty of measurement;
The technological means that realizes electromagnetic shielding is simple;
The pad size that is used for coil is together in series is big, and the electric reliability of welding is high;
The number of welds that is used for coil is together in series is few, and failure rate reduces greatly;
The damage of PCB formula coil and coil connection PCB is easy to inspection, is easy to repair or change, and maintenance cost is cheap;
Mechanical strength is high, can flexural deformation, do not change certainty of measurement;
Good temp characteristic, high temperature resistant, there are aging and performance index variation issue hardly, the life-span is long.
Embodiment 2
Referring to Fig. 7; Wherein show a kind of comprehensively regulating module (comprehensively regulating circuit) that is used for the squirrel-cage air-core current transformer, it comprises input protection circuit, input change-over circuit, low-pass filter circuit, adjustable phase-shift circuit, gain adjusting circuit and the output conversion circuit that is electrically connected successively.
Preferably, said comprehensively regulating module also comprises 24 volts of DC power supplys.This conditioning module is and " squirrel-cage air-core current transformer " supporting signal conditioning circuit.The content of conditioning comprises: the amplitude limiting processing of signal, harmonic filtration, adjustable phase shift, gain-adjusted and I/O mode adjustment etc.
Electric current that this conditioning module is surveyed is taken from super high power perception power consumption equipment.The serious surge peak current of equipment start-stop moment generation, strong thunder and lightning also can cause the generation of same situation, and magnetic test coil will be exported the output voltage of ultra normal value far away, and this influences the job security of follow-up signal treatment circuit.The comprehensively regulating module is provided with the signal limiter link based on TVS, and under the normal condition, this link is inoperative; In case the peak voltage of protection value occurs surpassing; This protection link is moved immediately, input voltage is limited within the safe voltage, after the peak voltage; This circuit recovers automatically, thus the protection subsequent conditioning circuit.
Simultaneously; This conditioning module institute number of winning the confidence is from complex electromagnetic environments; The excess load of non-linear perceptual power consumption equipment work of super high power and transformer is used and is caused the electric current of surveying to comprise serious harmonic components; This influences the correctness of measurement result, and especially the measurement for power factor can bring serious deviation.The comprehensively regulating module comprises multistage LPF link, and the frequency multiplication harmonic components more than the fundamental frequency is significantly decayed with the attenuation rate that is not less than 10 decibels/octave, has guaranteed that the height of output signal is pure.
Air-core current transformer output and institute's proportional voltage signal of the electric current of surveying, leading the electric current of surveying 90 is spent on phase place, need carry out phase place when being used for power-factor measurement and reduce.Common phase-shift circuit adopts simple integrator, and fixedly phase shift 90 degree comprise the certain angle deviation during actual the use, also do not possess the flexibility of adjusting.The intervention of comprehensively regulating module prime filter circuit has changed the above-mentioned phase relation of output voltage signal with the electric current of surveying, and adjustable phase shift link can be adjusted the phase relation between the two easily, realizes the accurate reproduction of current phase.
The effect that the comprehensively regulating module is provided with the gain-adjusted link is that the range of current measurement and ratio demarcate, and also is convenient to the signal processing of subsequent conditioning circuit.
I/O mode adjustment link comprises input mode adjustment and two links of way of output adjustment.The input mode adjustment is changed into single ended mode with differential input mode, is convenient to signal processing; Way of output adjustment is transformed to the differential way of output with the single-ended way of output, help signal teletransmission and with the connecting of subsequent conditioning circuit.
Need to prove that the comprehensively regulating module is when concrete the realization, same components and parts or electronic circuit can realize not terminating in above-mentioned certain single function.
The comprehensively regulating module of the utility model compared with prior art has one or more following advantage:
Can with the supporting signal condition that carries out of squirrel-cage air-core current transformer, can be used for the current measurement of the short net of high-power smelting equipment such as the hot stove in ore deposit, converter;
Under the normal condition, the signal limiter link is inoperative, in case the peak voltage of protection value occurs surpassing, this protection link is moved immediately.
The above only is the preferred embodiment of the utility model, be not the utility model is done any pro forma restriction, though the utility model disclose as above with preferred embodiment, yet be not in order to limit the utility model.Those of ordinary skills, in not breaking away from the utility model technical scheme scope, the technology contents of above-mentioned announcement capable of using is made amendment and is changed.It is pointed out that technical spirit according to the utility model to any simple modification, equivalent variations and modification that above embodiment did, all still belongs in the scope of the utility model technical scheme.The protection range of the utility model is defined by the following claims.
Claims (2)
1. a comprehensively regulating module that is used for the squirrel-cage air-core current transformer is characterized in that comprising the input protection circuit, input change-over circuit, low-pass filter circuit, adjustable phase-shift circuit, gain adjusting circuit and the output conversion circuit that are electrically connected successively.
2. the comprehensively regulating module that is used for the squirrel-cage air-core current transformer according to claim 1 is characterized in that said comprehensively regulating module also comprises 24 volts of DC power supplys.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2012200381245U CN202443855U (en) | 2012-02-07 | 2012-02-07 | Comprehensive conditioning module for squirrel-cage hollow current transformer |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2012200381245U CN202443855U (en) | 2012-02-07 | 2012-02-07 | Comprehensive conditioning module for squirrel-cage hollow current transformer |
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| Publication Number | Publication Date |
|---|---|
| CN202443855U true CN202443855U (en) | 2012-09-19 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2012200381245U Expired - Fee Related CN202443855U (en) | 2012-02-07 | 2012-02-07 | Comprehensive conditioning module for squirrel-cage hollow current transformer |
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| Country | Link |
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| CN (1) | CN202443855U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113970660A (en) * | 2021-09-21 | 2022-01-25 | 南京理工大学 | Open-close type annular PCB type pulse heavy current sensor |
| CN116718865A (en) * | 2023-01-18 | 2023-09-08 | 辽宁汉华信息工程有限公司 | 10kV distribution line overhead type LTU based on PCB Rogowski coil |
-
2012
- 2012-02-07 CN CN2012200381245U patent/CN202443855U/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113970660A (en) * | 2021-09-21 | 2022-01-25 | 南京理工大学 | Open-close type annular PCB type pulse heavy current sensor |
| CN116718865A (en) * | 2023-01-18 | 2023-09-08 | 辽宁汉华信息工程有限公司 | 10kV distribution line overhead type LTU based on PCB Rogowski coil |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20120919 Termination date: 20170207 |
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| CF01 | Termination of patent right due to non-payment of annual fee |