CN101256204B - Current detecting device and calibration method - Google Patents
Current detecting device and calibration method Download PDFInfo
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- CN101256204B CN101256204B CN 200810002810 CN200810002810A CN101256204B CN 101256204 B CN101256204 B CN 101256204B CN 200810002810 CN200810002810 CN 200810002810 CN 200810002810 A CN200810002810 A CN 200810002810A CN 101256204 B CN101256204 B CN 101256204B
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- 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
- G01R15/14—Adaptations providing voltage or current isolation, e.g. for high-voltage or high-current networks
- G01R15/18—Adaptations providing voltage or current isolation, e.g. for high-voltage or high-current networks using inductive devices, e.g. transformers
- G01R15/181—Adaptations providing voltage or current isolation, e.g. for high-voltage or high-current networks using inductive devices, e.g. transformers using coils without a magnetic core, e.g. Rogowski coils
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R35/00—Testing or calibrating of apparatus covered by the other groups of this subclass
- G01R35/005—Calibrating; Standards or reference devices, e.g. voltage or resistance standards, "golden" references
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Abstract
The invention relates to a circuit detecting device and calibration method thereof, wherein Rogowski coil is used as circuit detecting device of sensor. In the calibration method, during changing the measuring range, the work condition of the Rogowski coil does not change and the voltage resource provides calibration input in replacement of Rogowski coil, therefore the calibration work of high magnitude and measuring range is accomplished. Because the accuracy of required device is higher than the standard accuracy of RIS device by one or two order of magnitude, all the devices are common minitype movable devices in country legal measuring institution, therefore the public is realized from the misguided technical difficulty and a new simple RIS device and calibration method which can be accepted and used by public, factory, user, the third party country legal measuring institution are provided, therefore the practicality and popularized application of RIS device are driven.
Description
Technical field
The present invention relates to the electric energy metrical field, particularly current detecting and collimation technique field specifically refer to a kind of current sensing means and calibration steps thereof take the Rogowski coil as sensor.
Background technology
At present, the calibration steps of known current sensing means (being called for short RIS) take the Rogowski coil as sensor is imperfection always, remains to be developed.
Current, the range ability of RIS device generally covers 20A-300KA, and in particular cases, value can also be higher.
Known understanding to the Rogowski coil specifically sees also with Publication about Document:
Take off and grasp letter " checking of great current ", Beijing: China Machine Press in January, 1987
Wherein, be the Rogowski coil to be connect integrator can consist of current sensing means always.There have been decades in this understanding, and it has in fact become classical theory, and is undoubted.Even the calibration of the RIS device that makes up under this understanding instructs has been absorbed in predicament, people suspected never also that this understanding itself had problem, but all the time problem were summed up as measuring principle imperfection, the defectiveness of Rogowski coil.
Known RIS device calibration steps has following two kinds:
(1) a kind of is direct method, and it is by normalized current source input current I1, and the RIS device records electric current I 2, thereby can measure the calibration factor K=I1/I2 of RIS.
It is impracticable that the method is actually, and reason is very simple:
At first, if the normalized current source of the high magnitude of K amperes up to a hundred is arranged, then equipment is huge, can't move, and RIS equipment is huge too, can't move, do not possess whole censorship condition; If take RIS apart, the part censorship has then destroyed the basic status that RIS works.
This method transmission of quantity value and the maximum amount value of tracing to the source can be subject to normalized current source maximum amount value and load-bearing capacity restriction, the maximum amount value of the RIS current source maximum amount value that can not be above standard.At present, the normalized current source value that constitutional law devise a stratagem measuring mechanism can provide and load all littlely is about 100A-1000A, according to said method, can not carry out the transmission of value up to the RIS of hundreds of K ampere and traces to the source value.
(2) another kind is indirect method, specifically also sees also with Publication about Document:
Take off and grasp letter " checking of great current ", Beijing: China Machine Press in January, 1987
The method needs censorship Rogowski coil, sets up experimental circuit, and the configuration standard mutual inductor is compared by mutual inductance M and standard mutual inductor Ms with Rogowski, determines coefficient of mutual inductance.Then, with the parameter of all devices in coefficient of mutual inductance and the whole circuit, substitution integrated circuit computing formula, thus finish the calibration of RIS.According to said method calibrate the RIS device, need to be with whole RIS circuit completely knocked down, and measure the parameter of all devices.
Owing in the situation of not taking the RIS circuit apart, can't calibrate.Thereby the method destroyed the integrality of RIS device, in fact can say without actual operation.
Summary of the invention
The objective of the invention is to have overcome above-mentioned shortcoming of the prior art, a kind of normalized current source that can not limit the maximum amount value, not need large-signal be provided, do not need to measure the coefficient of mutual inductance of Rogowski coil, do not need to take apart the RIS device, easily realize automatic calibration, easily by people common current sensing means and the calibration steps thereof of accepting and using.
The technical solution adopted for the present invention to solve the technical problems is:
This current sensing means, comprise the sensing module and the integration amplification module that are consisted of with the Rogowski coil, its principal feature is, also comprise standard variable voltage constant pressure source and the dividing potential drop conversion module with several range wave bands in the described device, the input end of described dividing potential drop conversion module optionally is connected with described sensing module or standard variable voltage constant pressure source, and the output terminal of this dividing potential drop conversion module is connected in described integration amplification module.
The dividing potential drop conversion module of this current sensing means comprises sample resistance unit and waver unit, the input end of described sample resistance unit optionally is connected in the output terminal of described sensing module or the output terminal of standard variable voltage constant pressure source, and this sample resistance unit has several variable dividing potential drop output terminals, the input end of described waver unit optionally is connected with a output terminal in this several variable dividing potential drop output terminal, and the output terminal of this waver unit is connected with the input end of described integration amplification module.
The sample resistance unit of this current sensing means comprises successively several divider resistances of series connection, these several divider resistances optionally are connected across the output terminal two ends of described sensing module or the output terminal two ends of described standard variable voltage constant pressure source, and the extension line between the adjacent divider resistance is connected in corresponding variable dividing potential drop output terminal.
Also include the change-over switch module in this current sensing means, the stiff end of described change-over switch module is connected in the input end of described dividing potential drop conversion module, and the switch terminal of this change-over switch module optionally is connected with the output terminal of described sensing module or the output terminal of standard variable voltage constant pressure source.
The switch terminal of the change-over switch module of this current sensing means also optionally so that described sensing module connect successively with described standard variable voltage constant pressure source and be connected with the switch terminal of this change-over switch module.
Also include the voltage follow module in this current sensing means, described voltage follow module accesses between the input end of the output terminal of described dividing potential drop conversion module and described integration amplification module.
Be somebody's turn to do the method that above-mentioned current sensing means is calibrated, its principal feature is that described method may further comprise the steps:
(1) described dividing potential drop conversion module is connected with described sensing module;
(2) with the current load in a normalized current source to sensing module, detect described current sensing means and be in calibration factor under the small-range wave band condition at the dividing potential drop conversion module;
(3) described standard variable voltage constant pressure source is accessed described dividing potential drop conversion module;
(4) detect this current sensing means and be in input and output voltage ratio under the different range wave band conditions at the dividing potential drop conversion module;
(5) obtain this current sensing means according to testing result and be in calibration factor under the different range wave band conditions at the dividing potential drop conversion module.
This current sensing means is in calibration factor under the small-range wave band condition at the dividing potential drop conversion module, may further comprise the steps:
(21) the dividing potential drop conversion module is arranged at the electric current I 1 big or small small-range wave band that can be fit to of exporting in this normalized current source;
(22) the dividing potential drop conversion module is arranged under the small-range wave band condition, measures the voltage U 1 at integration amplification module output terminal two ends;
(23) calculate this current sensing means according to following formula and be in calibration factor K1 under the small-range wave band condition at the dividing potential drop conversion module:
K1＝I1/U1。
Step (22) in this method that current sensing means is calibrated is:
The dividing potential drop conversion module is arranged at the range wave band that can be fit to this normalized current source output current size that loads.
Step (3) in this method that current sensing means is calibrated is:
Described dividing potential drop conversion module is disconnected and being connected of sensing module, and described standard variable voltage constant pressure source is connected with described dividing potential drop conversion module.
Detection current sensing means in this method that current sensing means is calibrated is in input and output voltage ratio under the different range wave band conditions at the dividing potential drop conversion module, may further comprise the steps:
(41) described dividing potential drop conversion module is arranged at one of them range wave band;
(42) size of the voltage U 2 of described standard variable voltage constant pressure source output is set to the numerical value in the current range wave band of this current sensing means;
(43) voltage U 3 at the output terminal two ends of the described integration amplification module of measurement;
(44) according to following formula calculate this current sensing means at the input and output voltage of current range wave band than K3:
K3＝U2/U3；
(45) the range wave band during than K1 is identical if current range wave band is with the input current output voltage that detects this sensing module, and then the second input and output voltage compares K2=K3;
(46) if described current sensing means also exists other range wave band not yet to detect, then described dividing potential drop conversion module switching is arranged at corresponding range wave band, and repeats above-mentioned steps (42).
The current sensing means that obtains in this method that current sensing means is calibrated is in calibration factor under the different range wave band conditions at the dividing potential drop conversion module, is specially:
Calculate this current sensing means according to following formula and be in calibration factor K under the different range wave band conditions at the dividing potential drop conversion module:
K3/K2 under K=K1 * corresponding range wave band.
Step (1) in this method that current sensing means is calibrated is further comprising the steps of before:
(A1) described dividing potential drop conversion module is disconnected and being connected of sensing module;
(A2) with the current load in a normalized current source to sensing module, detect the internal resistance of Rogowski coil in the independent input electric current output voltage ratio, sensing module of this sensing module and the resistance of dividing potential drop conversion module input end.
The internal resistance of Rogowski coil and the resistance of dividing potential drop conversion module input end in the independent input electric current output voltage ratio of the detection sensing module in this method that current sensing means is calibrated, the sensing module may further comprise the steps:
(A21) size of the electric current I s of this normalized current source output is set to the interior numerical value of minimum range wave band of this current sensing means;
(A22) measure the voltage U s at these sensing module output terminal two ends;
(A23) the input current output voltage that calculates this sensing module according to following formula is than Ks:
Ks＝Is/Us；
(A24) measure the resistance R s at the output terminal two ends of Rogowski coil in this sensing module;
(A25) measure the resistance R _ f at these dividing potential drop conversion module input end two ends.
The current sensing means that obtains in this method that current sensing means is calibrated is in calibration factor under the different range wave band conditions at the dividing potential drop conversion module, is specially:
Calculate this current sensing means according to following formula and be in calibration factor K under the different range wave band conditions at the dividing potential drop conversion module:
K3 under K=Ks * different range wave bands * (Rf+Rs)/(Rf).
Also include the change-over switch module in the current sensing means in this method that current sensing means is calibrated, the stiff end of described change-over switch module is connected in the input end of described dividing potential drop conversion module, and optionally so that described sensing module is connected successively with described standard variable voltage constant pressure source and is connected with the switch terminal of this change-over switch module, described step (3) is the switch terminal of this change-over switch module:
Described sensing module is connected successively with described standard variable voltage constant pressure source and be connected with the switch terminal of this change-over switch module.
Detection current sensing means in this method that current sensing means is calibrated is in input and output voltage ratio under the different range wave band conditions at the dividing potential drop conversion module, may further comprise the steps:
(41) described dividing potential drop conversion module is arranged at one of them range wave band;
(42) size of the voltage U 2 of described standard variable voltage constant pressure source output is set to the numerical value in the current range wave band of this current sensing means;
(43) voltage U 3 at the output terminal two ends of the described integration amplification module of measurement;
(44) according to following formula calculate this current sensing means at the input and output voltage of current range wave band than K3:
K3＝U2/U3；
(45) the range wave band during than K1 is identical if current range wave band is with the input current output voltage that detects this sensing module, and then the second input and output voltage compares K2=K3;
(46) if described current sensing means also exists other range wave band not yet to detect, then described dividing potential drop conversion module switching is arranged at corresponding range wave band, and repeats above-mentioned steps (42).
The current sensing means that obtains in this method that current sensing means is calibrated is in calibration factor under the different range wave band conditions at the dividing potential drop conversion module, is specially:
Calculate this current sensing means according to following formula and be in calibration factor K under the different range wave band conditions at the dividing potential drop conversion module:
K3/K2 under K=K1 * corresponding range wave band.
Step (1) in this method that current sensing means is calibrated is further comprising the steps of before:
(A1) described dividing potential drop conversion module is disconnected and being connected of sensing module;
(A2) with the current load in a normalized current source to sensing module, detect the independent input electric current output voltage ratio of this sensing module.
The independent input electric current output voltage ratio of the detection sensing module in this method that current sensing means is calibrated may further comprise the steps:
(A21) size of the electric current I s of this normalized current source output is set to the interior numerical value of minimum range wave band of this current sensing means;
(A22) measure the voltage U s at these sensing module output terminal two ends;
(A23) the input current output voltage that calculates this sensing module according to following formula is than Ks:
Ks＝Is/Us。
The current sensing means that obtains in this method that current sensing means is calibrated is in calibration factor under the different range wave band conditions at the dividing potential drop conversion module, is specially:
Calculate this current sensing means according to following formula and be in calibration factor K under the different range wave band conditions at the dividing potential drop conversion module:
K3 under K=Ks * different range wave bands.
Step (3) in this method that current sensing means is calibrated under the condition that does not comprise the voltage follow module is:
Described dividing potential drop conversion module is disconnected and being connected of sensing module, and described standard variable voltage constant pressure source is connected with described dividing potential drop conversion module.
Detection current sensing means in this method that current sensing means is calibrated is in input and output voltage ratio under the different range wave band conditions at the dividing potential drop conversion module, may further comprise the steps:
(41) described dividing potential drop conversion module is arranged at one of them range wave band;
(42) size of the voltage U 2 of described standard variable voltage constant pressure source output is set to the numerical value in the current range wave band of this current sensing means;
(43) voltage U 3 at the output terminal two ends of the described integration amplification module of measurement;
(44) according to following formula calculate this current sensing means at the input and output voltage of current range wave band than K3:
K3＝U2/U3；
(45) the range wave band during than K1 is identical if current range wave band is with the input current output voltage that detects this sensing module, and then the second input and output voltage compares K2=K3;
(46) if described current sensing means also exists other range wave band not yet to detect, then described dividing potential drop conversion module switching is arranged at corresponding range wave band, and repeats above-mentioned steps (42).
Step (1) in this method that current sensing means is calibrated is further comprising the steps of before:
(A1) described dividing potential drop conversion module is disconnected and being connected of sensing module;
(A2) internal resistance, this dividing potential drop conversion module of detecting Rogowski coil in this sensing module are in the input pickup resistance under the different range wave band conditions, the independent input electric current output voltage ratio of this sensing module.
Internal resistance, the dividing potential drop conversion module of Rogowski coil are in the input pickup resistance under the different range wave band conditions, the independent input electric current output voltage ratio of sensing module in the detection sensing module in this method that current sensing means is calibrated, may further comprise the steps:
(A21) this normalized current source output current Is;
(A22) measure the voltage U s at these sensing module output terminal two ends;
(A23) the input current output voltage that calculates this sensing module according to following formula is than Ks:
Ks＝Is/Us。
(A24) this normalized current source output current is closed;
(A25) measure the resistance R s at the output terminal two ends of Rogowski coil in this sensing module;
(A26) measure this dividing potential drop conversion module and be in input pickup resistance R3 under the different range wave band conditions;
(A27) the range wave band during than K1 is identical if current range wave band is with the input current output voltage that detects this sensing module, then the second input pickup resistance R2=R3;
(A28) if described current sensing means also exists other range wave band not yet to detect, then described dividing potential drop conversion module switching is arranged at corresponding range wave band, and repeats above-mentioned steps (A26).
The current sensing means that obtains in this method that current sensing means is calibrated is in calibration factor under the different range wave band conditions at the dividing potential drop conversion module, is specially:
Calculate this current sensing means according to following formula and be in calibration factor K under the different range wave band conditions at the dividing potential drop conversion module:
K3 under K=Ks * corresponding range * (R3+Rs under the corresponding range)/(R3 under the corresponding range).
The current sensing means that obtains in this method that current sensing means is calibrated is in calibration factor under the different range wave band conditions at the dividing potential drop conversion module, is specially:
Calculate this current sensing means according to following formula and be in calibration factor K under the different range wave band conditions at the dividing potential drop conversion module:
K3/K2 under K=K1 * corresponding range * (R3+Rs under the corresponding range)/(R2+Rs under the corresponding range);
Current sensing means of the present invention and calibration steps thereof have been adopted, because its required instrument is all more common, voltage table, the accuracy of reometer is than high one or two order of magnitude of the accuracy of RIS device normalization, as long as the normalized current source is about 100A, standard voltage source needs only several millivolts to tens volts, these all are common small-sized movable instruments in the constitutional law devise a stratagem measuring mechanism, thereby the public is freed from misguided technological fix, and found out the root that known RIS device can not the high magnitude transmission and traced to the source, obtained easily by the public, manufacturer, the user, legal metering mechanism of third country common new simple and feasible RIS device and the calibration steps of accepting and using, thereby the practical and industry that has promoted effectively the RIS device is applied.
Description of drawings
Fig. 1 is the circuit theory diagrams of current sensing means of the present invention.
Fig. 2 a, 2b, 2c and 2d be respectively among Fig. 1 5.-four kinds of connection status figure of change-over switch.
Wherein:
1.-and standard variable AC voltage constant pressure source, simulation Rogowski coil provides voltage signal
2.-the variable ac current source of standard
3.-vertically pass the metallic conductor of Rogowski coil
4.-the Rogowski coil
5.-change-over switch
Throw connection status one (connect contact point g, a, connect contact point h, b):
Series connection 4.-the Rogowski coil, disconnect 1.-standard variable AC voltage constant pressure source;
Throw connection status two (connect contact point g, j, connect contact point h, k):
Disconnect 4.-the Rogowski coil, series connection 1.-standard variable AC voltage constant pressure source;
Throw connection status three (connect contact point a, j, connect contact point h, b, connect contact point g, k):
The series connection 4.-the Rogowski coil, the series connection 1.-standard variable AC voltage constant pressure source;
Throw connection status four (disconnecting all connections between contact point g, b, g, h, j, the k):
Disconnect 4.-the Rogowski coil, disconnect 1.-standard variable AC voltage constant pressure source.
6.-sample resistance
7.-waver
Throw contact point c and connect maximum range;
Throw contact point d and connect relatively large journey;
Throwing contact point e connects than small-range;
Throw contact point f and connect minimum range.
8.-voltage follower
9.-integrating amplifier
Embodiment
In order more clearly to understand technology contents of the present invention, describe in detail especially exemplified by following examples.
This current sensing means, comprise the sensing module and the integration amplification module that are consisted of with the Rogowski coil, wherein, also comprise standard variable voltage constant pressure source and the dividing potential drop conversion module with several range wave bands in the described device, the input end of described dividing potential drop conversion module optionally is connected with described sensing module or standard variable voltage constant pressure source, and the output terminal of this dividing potential drop conversion module is connected in described integration amplification module.
Wherein, described dividing potential drop conversion module comprises sample resistance unit and waver unit, the input end of described sample resistance unit optionally is connected in the output terminal of described sensing module or the output terminal of standard variable voltage constant pressure source, and this sample resistance unit has several variable dividing potential drop output terminals, the input end of described waver unit optionally is connected with a output terminal in this several variable dividing potential drop output terminal, and the output terminal of this waver unit is connected with the input end of described integration amplification module.
Simultaneously, this sample resistance unit comprises successively several divider resistances of series connection, these several divider resistances optionally are connected across the output terminal two ends of described sensing module or the output terminal two ends of described standard variable voltage constant pressure source, and the extension line between the adjacent divider resistance is connected in corresponding variable dividing potential drop output terminal.
And, also including the change-over switch module in the current sensing means of the present invention, the stiff end of described change-over switch module is connected in the input end of described dividing potential drop conversion module, and the switch terminal of this change-over switch module optionally realizes following functions:
Throw connection status one and connect 4.-the Rogowski coil, disconnect 1.-standard variable AC voltage constant pressure source;
Throw connection status two and disconnect 4.-the Rogowski coil, connect 1.-standard variable AC voltage constant pressure source;
Throw connection status three and connect 4.-the Rogowski coil, connect 1.-standard variable AC voltage constant pressure source;
Throw connection status four and disconnect 4.-the Rogowski coil, disconnect 1.-standard variable AC voltage constant pressure source.
Namely, optionally be connected with the output terminal of described sensing module or the output terminal of standard variable voltage constant pressure source, perhaps so that described sensing module connect successively with described standard variable voltage constant pressure source and be connected with the switch terminal of this change-over switch module.
Can also include the voltage follow module in this current sensing means, described voltage follow module accesses between the input end of the output terminal of described dividing potential drop conversion module and described integration amplification module, in following specific embodiments, must comprise in the first scheme, being optional in the first scheme, is not to be covered in the third scheme.
Be somebody's turn to do the method that above-mentioned current sensing means is calibrated, may further comprise the steps:
(1) described dividing potential drop conversion module is connected with described sensing module;
(2) with the current load in a normalized current source to sensing module, detect this current sensing means and be in calibration factor under the small-range wave band condition at the dividing potential drop conversion module, may further comprise the steps:
(a) the dividing potential drop conversion module is arranged at the electric current I 1 big or small small-range wave band that can be fit to of exporting in this normalized current source;
(b) measure the voltage U 1 at these sensing module output terminal two ends;
(c) calculate this current sensing means according to following formula and be in calibration factor K1 under the small-range wave band condition at the dividing potential drop conversion module:
K1＝I1/U1；
(3) described standard variable voltage constant pressure source is accessed described dividing potential drop conversion module, is specially:
Access way one disconnects described dividing potential drop conversion module and being connected of sensing module, and described standard variable voltage constant pressure source is connected with described dividing potential drop conversion module; Perhaps:
Access way two is connected described sensing module successively with described standard variable voltage constant pressure source and is connected with the switch terminal of this change-over switch module.
Access way one is adopted by scheme one, scheme three, and access way two is adopted by scheme two.
(4) detect this current sensing means and be in input and output voltage ratio under the different range wave band conditions at the dividing potential drop conversion module, may further comprise the steps:
(a) described dividing potential drop conversion module is arranged at one of them range wave band;
(b) size of the voltage U 2 of described standard variable voltage constant pressure source output is set to the numerical value in the current range wave band of this current sensing means;
(c) voltage U 3 at the output terminal two ends of the described integration amplification module of measurement;
(d) according to following formula calculate this current sensing means at the input and output voltage of current range wave band than K3:
K3＝U2/U3；
(e) the range wave band during than K1 is identical if current range wave band is with the input current output voltage that detects this sensing module, and then the second input and output voltage compares K2=K3;
(f) if described current sensing means also exists other range wave band not yet to detect, then described dividing potential drop conversion module switching is arranged at corresponding range wave band, and repeats above-mentioned steps (b);
(5) under employing scheme one, scheme two conditions, obtain this current sensing means according to testing result and be in calibration factor under the different range wave band conditions at the dividing potential drop conversion module, be specially:
Calculate this current sensing means according to following formula and be in calibration factor K under the different range wave band conditions at the dividing potential drop conversion module:
K3/K2 under K=K1 * corresponding range wave band;
Perhaps, under employing scheme one condition, the step in the method (1) is further comprising the steps of before:
(A1) described dividing potential drop conversion module is disconnected and being connected of sensing module;
(A2) with the current load in a normalized current source to sensing module, detect the internal resistance of Rogowski coil in the independent input electric current output voltage ratio, sensing module of this sensing module and the resistance of dividing potential drop conversion module input end, may further comprise the steps:
(a) this normalized current source output current Is;
(b) measure the voltage U s at these sensing module output terminal two ends;
(c) the input current output voltage that calculates this sensing module according to following formula is than Ks:
Ks＝Is/Us；
(d) measure the resistance R s at the output terminal two ends of Rogowski coil in this sensing module;
(e) measure the resistance R _ f at these dividing potential drop conversion module input end two ends;
At this moment, obtain this current sensing means and be in calibration factor under the different range wave band conditions at the dividing potential drop conversion module, be specially:
Calculate this current sensing means according to following formula and be in calibration factor K under the different range wave band conditions at the dividing potential drop conversion module:
K3 under K=Ks * different range wave bands * (Rf+Rs)/(Rf);
Perhaps, under employing scheme two conditions, the step in the method (1) is further comprising the steps of before:
(A1) described dividing potential drop conversion module is disconnected and being connected of sensing module;
(A2) with the current load in a normalized current source to sensing module, detect the independent input electric current output voltage ratio of this sensing module, may further comprise the steps:
(a) this normalized current source output current Is;
(b) measure the voltage U s at these sensing module output terminal two ends;
(c) the input current output voltage that calculates this sensing module according to following formula is than Ks:
Ks＝Is/Us。
At this moment, obtain this current sensing means and be in calibration factor under the different range wave band conditions at the dividing potential drop conversion module, be specially:
Calculate this current sensing means according to following formula and be in calibration factor K under the different range wave band conditions at the dividing potential drop conversion module:
K3 under K=Ks * different range wave bands.
Perhaps, under employing scheme three conditions, the step in the method (1) is further comprising the steps of before:
(A1) described dividing potential drop conversion module is disconnected and being connected of sensing module;
(A2) with the current load in a normalized current source to sensing module, detect the internal resistance of Rogowski coil in the independent input electric current output voltage ratio, sensing module of this sensing module and the resistance that the dividing potential drop conversion module is in the input end under the different range wave band conditions, may further comprise the steps:
(a) this normalized current source output current Is;
(b) measure the voltage U s at these sensing module output terminal two ends;
(c) the input current output voltage that calculates this sensing module according to following formula is than Ks:
Ks＝Is/Us；
(d) this normalized current source output current is closed;
(e) measure the resistance R s at the output terminal two ends of Rogowski coil in this sensing module;
(f) measure this dividing potential drop conversion module and be in input pickup resistance R3 under the different range wave band conditions;
(g) the range wave band during than K1 is identical if current range wave band is with the input current output voltage that detects this sensing module, then the second input pickup resistance R2=R3;
(h) if described current sensing means also exists other range wave band not yet to detect, then described dividing potential drop conversion module switching is arranged at corresponding range wave band, and repeats above-mentioned steps (f).
At this moment, obtain this current sensing means and be in calibration factor under the different range wave band conditions at the dividing potential drop conversion module, be specially:
Calculate this current sensing means according to following formula and be in calibration factor K under the different range wave band conditions at the dividing potential drop conversion module:
K3 under K=Ks * corresponding range * (R3+Rs under the corresponding range)/(R3 under the corresponding range).
Perhaps:
Obtain this current sensing means and be in calibration factor under the different range wave band conditions at the dividing potential drop conversion module, be specially:
Calculate this current sensing means according to following formula and be in calibration factor K under the different range wave band conditions at the dividing potential drop conversion module:
K3/K2 under K=K1 * corresponding range * (R3+Rs under the corresponding range)/(R2+Rs under the corresponding range);
In the middle of practical application, basic fundamental route of the present invention is as follows:
Scheme one:
The first step asks the input current output voltage of Rogowski coil than Ks, the internal resistance Rs of Rogowski coil, voltage divider input pickup resistance Rf.
Give the electric current I s (such as 100A) of Rogowski coil by the normalized current source, measure the voltage U s (such as 10mV) of Rogowski both sides, calculate current/voltage than Ks=Is/Us (such as 10A/mV).Because the measuring process electric current is zero, without the internal resistance loss, thereby Ks is a constant, can be applied to the high magnitude range of other hundreds ofs KA.
Measure internal resistance Rs and the voltage divider input pickup resistance Rf of Rogowski coil.
Second step is asked the calibration factor under the RIS system small-range, and namely the input current output voltage compares K1.
Switch voltage divider to small-range (such as 200A), give the electric current I 1 (such as 100A) of Rogowski coil by the normalized current source, read the electric current U (representing with voltage, such as 10V) that RIS measures, calculate current/voltage than K1=I1/U (such as 10).
In the 3rd step, ask the input and output voltage of the different ranges of signal processing circuit to compare K3.
Disconnection Rogowski coil is connected with sample resistance, switch voltage divider to different ranges, give the former connection of the voltage divider Rogowski two ends injecting voltage U2 (such as 10mV-100mV-1V-10V-100V) of coil, the voltage that electric current is responded at the Rogowski coil in the current range ability of voltage swing and RIS is suitable, read the electric current U3 (representing with voltage) that RIS measures, calculate that input and output voltage compares K3=U2/U3 under the different ranges.
If the range of K3 is identical with the range of K1, K2=K3 then.
The 4th goes on foot, and asks the different range calibration coefficients of RIS device.
K1 * K3/K2 can be obtained calibration factor K under the different ranges (such as 100A-1kA-10kA-100kA-1000kA).
With Ks * K3 * (Rf+Rs)/(Rf) can obtain calibration factor K under the different ranges (such as 100A-1kA-10kA-100kA-1000kA).
See also shown in Figure 1ly, the below is the further specifying of specific implementation process of the calibration steps of scheme one:
The first step asks the input current output voltage of Rogowski coil than Ks, the internal resistance Rs of Rogowski coil, voltage divider input pickup resistance Rf.
With double throw switch 5., throw connection status four, disconnect the Rogowski coil 4., and the standard of disconnection variable AC voltage constant pressure source 1.;
Measure the voltage U s of Rogowski both sides, being among Fig. 1 is M, N point-to-point transmission voltage (such as 10mV);
Calculate current/voltage than Ks=Is/Us (such as 10A/mV);
Ks is a constant, can use other high magnitude ranges.
Measure the internal resistance Rs of Rogowski coil, being among Fig. 1 is M, N point-to-point transmission resistance (such as 100m Ω);
Measure voltage divider input pickup resistance Rf, be T, Y point-to-point transmission resistance (such as 50 Ω) among Fig. 1.
Second step is asked the calibration factor under the RIS system small-range, and namely the input current output voltage compares K1.
With double throw switch 5., throw connection status one, namely connect the Rogowski coil 4.;
With waver 7., throw contact point f and connect minimum range;
(electric current will be in this range, and electric current is too large, easy burn-out equipment to make the variable ac current source of standard 2. export the interior electric current I 1 of RIS minimum range; Electric current is too little, and inconvenience is measured.For example minimum range is 20A～200A, and electric current is got 100A.)；
Measure the voltage U 1 of RIS output, be P, Q point-to-point transmission voltage (such as 10V) among Fig. 1;
Calculate current/voltage than K1=I1/U1 (such as 10A/V); K1 is the calibration factor under the small-range.
Attention: this second step is not to select minimum range.As long as 2. the big or small range that can satisfy of output current can for the variable ac current source of standard.
In the 3rd step, ask the input and output voltage of the different ranges of signal processing circuit to compare K3.
With double throw switch 5., throw connection status two, the standard of namely connecting variable AC voltage constant pressure source 1.;
Select range, with waver 7., throw a certain contact point.
Make standard variable AC voltage constant pressure source that 1. voltage U 2 is provided, the voltage range at Rogowski coil two ends when voltage swing does not exceed the RIS device and detects current range electric current.
Measuring the voltage U 3 of RIS output terminal, is P, Q point-to-point transmission voltage among the figure;
The input and output voltage that calculates current range compares K3=U2/U3;
Switch waver and 7. arrive other ranges, according to top method, the input and output voltage that calculates other ranges compares K3.
If the K3 range is identical with the K1 range, K2=K3 then;
The 4th goes on foot, and asks the different range calibration coefficients of RIS device.
K3/K2 under K=K1 * corresponding range; Perhaps
K3 under K=Ks * corresponding range * (Rf+Rs)/(Rf).
Scheme two:
The first step asks the input current output voltage of Rogowski coil to compare Ks.Give the electric current I s (such as 100A) of Rogowski coil by the normalized current source, measure the voltage U s (such as 10mV) of Rogowski both sides, calculate current/voltage than Ks=Is/Us (such as 10A/mV).Because the measuring process electric current is zero, without the internal resistance loss, thereby Ks is a constant, can be applied to the high magnitude range of other hundreds ofs KA.
Second step is asked the calibration factor under the RIS system small-range, and namely the input current output voltage compares K1.
Switch voltage divider to small-range (such as 200A), give the electric current I 1 (such as 100A) of Rogowski coil by the normalized current source, read the electric current U (representing with voltage, such as 10V) that RIS measures, calculate current/voltage than K1=I1/U (such as 10).
In the 3rd step, ask the input and output voltage of the different ranges of RIS system to compare K3.
The variable AC constant voltage source of between Rogowski coil and sample resistance, connecting.Switch voltage divider to different ranges, variable AC constant voltage source output voltage U 2 (such as 10mV-100mV-1V-10V-100V), the voltage that electric current is responded at the Rogowski coil in the current range ability of voltage swing and RIS is suitable, read the electric current U3 (representing with voltage) that RIS measures, calculate that input and output voltage compares K3=U2/U3 under the different ranges.
If the range of K3 is identical with the range of K1, K2=K3 then.
The 4th goes on foot, and asks the different range calibration coefficients of RIS device.
K1 * K3/K2 can be obtained calibration factor K under the different ranges (such as 100A-1kA-10kA-100kA-1000kA);
Ks * K3 also can be obtained calibration factor K under the different ranges (such as 100A-1kA-10kA-100kA-1000kA).
Below in conjunction with drawings and Examples device of the present invention and calibration steps are further specified.
The first step asks the input current output voltage of Rogowski coil to compare Ks.
With double throw switch 5., throw connection status two and disconnect the Rogowski coil 4.;
Measure the voltage U s of Rogowski both sides, be M, N point-to-point transmission voltage (such as 10mV) among Fig. 1;
Calculate current/voltage than Ks=Is/Us (such as 10A/mV);
Ks is a constant, can use other high magnitude ranges.
Second step is asked the calibration factor under the RIS system minimum range, and namely the input current output voltage compares K1.
With double throw switch 5., throw connection status one, series connection Rogowski coil 4.;
With waver 7., throw contact point f and connect minimum range;
(electric current will be in this range, and electric current is too large, easy burn-out equipment to make the variable ac current source of standard 2. export the interior electric current I 1 of RIS minimum range; Electric current is too little, and inconvenience is measured.For example minimum range is 20A～200A, and electric current is got 100A.)；
Measuring the voltage U 1 of RIS output, is P, Q point-to-point transmission voltage (such as 10V) among the figure;
Calculate current/voltage than K1=I1/U1 (such as 10A/V); K1 is the calibration factor under the minimum range.
Attention: this step is not to select minimum range.As long as 2. the big or small range that can satisfy of the variable ac current source output current of standard can.
In the 3rd step, ask the input and output voltage of the different ranges of RIS system to compare K3.
With double throw switch 5., throw connection status three, connect the Rogowski coil 4., and series connection standard variable AC voltage constant pressure source 1.;
Select range, with waver 7., throw a certain contact point.
Make standard variable AC voltage constant pressure source that 1. voltage U 3 is provided, the voltage range at Rogowski coil two ends when voltage swing does not exceed the RIS device and detects current range electric current.
Measuring the voltage U 2 of RIS output terminal, is P, Q point-to-point transmission voltage among the figure;
The input and output voltage that calculates current range compares K3=U3/U2;
Switch waver and 7. arrive other ranges, according to top method, the input and output voltage that calculates other ranges compares K3.
If the K3 range is identical with the K1 range, K2=K3 then;
The 4th goes on foot, and asks the different range calibration coefficients of RIS device.
K3/K2 under K=K1 * corresponding range; Perhaps:
K3 under K=Ks * corresponding range.
Scheme three:
The first step is asked the calibration factor under the RIS system small-range, and namely the input current output voltage compares K1.
Switch voltage divider to small-range (such as 200A), give the electric current I 1 (such as 100A) of Rogowski coil by the normalized current source, read the electric current U (representing with voltage, such as 10V) that RIS measures, calculate current/voltage than K1=I1/U (such as 10).
Second step asks the input current output voltage of Rogowski coil than Ks, the internal resistance Rs of Rogowski coil, the input pickup resistance R3 of the different ranges of voltage divider.
Give the electric current I s (such as 100A) of Rogowski coil by the normalized current source, measure the voltage U s (such as 10mV) of Rogowski both sides, calculate current/voltage than Ks=Is/Us (such as 10A/mV).Because the measuring process electric current is zero, without the internal resistance loss, thereby Ks is a constant, can be applied to the high magnitude range of other hundreds ofs KA.
Measure the internal resistance Rs of Rogowski coil.
Measure the input pickup resistance R3 of the different ranges of voltage divider.
If the range of R3 is identical with the range of K1, R2=R3 then.
In the 3rd step, ask the input and output voltage of the different ranges of signal processing circuit to compare K3.
Disconnection Rogowski coil is connected with sample resistance, switch voltage divider to different ranges, give the former connection of the voltage divider Rogowski two ends injecting voltage U2 (such as 10mV-100mV-1V-10V-100V) of coil, the voltage that electric current is responded at the Rogowski coil in the current range ability of voltage swing and RIS is suitable, read the electric current U3 (representing with voltage) that RIS measures, calculate that input and output voltage compares K3=U2/U3 under the different ranges.
If the range of K3 is identical with the range of K1, K2=K3 then.
The 4th goes on foot, and asks the different range calibration coefficients of RIS device.
K3 under K=Ks * corresponding range * (R3+Rs under the corresponding range)/(R3 under the corresponding range).
Perhaps:
K3/K2 under K=K1 * corresponding range * (R3+Rs under the corresponding range)/(R2+Rs under the corresponding range);
Can obtain the calibration factor K under the different ranges (such as 100A-1kA-10kA-100kA-1000kA).
See also shown in Figure 1ly, the below is the further specifying of specific implementation process of the calibration steps of scheme three:
The first step is asked the calibration factor under the RIS system small-range, and namely the input current output voltage compares K1.
With double throw switch 5., throw connection status one, namely connect the Rogowski coil 4.;
With waver 7., throw contact point f and connect minimum range;
(electric current will be in this range, and electric current is too large, easy burn-out equipment to make the variable ac current source of standard 2. export the interior electric current I 1 of RIS minimum range; Electric current is too little, and inconvenience is measured.For example minimum range is 20A～200A, and electric current is got 100A.)；
Measure the voltage U 1 of RIS output, be P, Q point-to-point transmission voltage (such as 10V) among Fig. 1;
Calculate current/voltage than K1=I1/U1 (such as 10A/V); K1 is the calibration factor under the small-range.
Attention: this step is not to select minimum range.As long as 2. the big or small range that can satisfy of output current can for the variable ac current source of standard.
Second step asks the input current output voltage of Rogowski coil than Ks, the internal resistance Rs of Rogowski coil, the input pickup resistance R3 of the different ranges of voltage divider.
With double throw switch 5., throw connection status four, disconnect the Rogowski coil 4., and the standard of disconnection variable AC voltage constant pressure source 1.;
Measure the voltage U s of Rogowski both sides, being among Fig. 1 is M, N point-to-point transmission voltage (such as 10mV);
Calculate current/voltage than Ks=Is/Us (such as 10A/mV);
Ks is a constant, can use other high magnitude ranges.
Measure the internal resistance Rs of Rogowski coil, being among Fig. 1 is M, N point-to-point transmission resistance (such as 100m Ω);
Measure the input pickup resistance R3 of the different ranges of voltage divider, be T, Y point-to-point transmission resistance (such as 50 Ω) among Fig. 1.
If the range of R3 is identical with the range of K1, R2=R3 then.
In the 3rd step, ask the input and output voltage of the different ranges of signal processing circuit to compare K3.
With double throw switch 5., throw connection status two, the standard of namely connecting variable AC voltage constant pressure source 1.;
Select range, with waver 7., throw a certain contact point.
Make standard variable AC voltage constant pressure source that 1. voltage U 2 is provided, the voltage range at Rogowski coil two ends when voltage swing does not exceed the RIS device and detects current range electric current.
Measuring the voltage U 3 of RIS output terminal, is P, Q point-to-point transmission voltage among the figure;
The input and output voltage that calculates current range compares K3=U2/U3;
Switch waver and 7. arrive other ranges, according to top method, the input and output voltage that calculates other ranges compares K3.
If the range of K3 is identical with the range of K1, K2=K3 then;
The 4th goes on foot, and asks the different range calibration coefficients of RIS device.
K3 under K=Ks * corresponding range * (R3+Rs under the corresponding range)/(R3 under the corresponding range).
Perhaps:
K3/K2 under K=K1 * corresponding range * (R3+Rs under the corresponding range)/(R2+Rs under the corresponding range);
Current sensing means of the present invention and calibration steps have been adopted, because its required instrument is all more common, voltage table, the accuracy of reometer is than high one or two order of magnitude of the accuracy of RIS device normalization, as long as the normalized current source is about 100A, standard voltage source needs only several millivolts to tens volts, these all are common small-sized movable instruments in the constitutional law devise a stratagem measuring mechanism, thereby the public is freed from misguided technological fix, and found out the root that known RIS device can not the high magnitude transmission and traced to the source, obtained easily by the public, manufacturer, the user, legal metering mechanism of third country common new simple and feasible RIS device and the calibration steps of accepting and using, thereby the practical and industry that has promoted effectively the RIS device is applied.
In this instructions, the present invention is described with reference to its specific embodiment.But, still can make various modifications and conversion obviously and not deviate from the spirit and scope of the present invention.Therefore, instructions and accompanying drawing are regarded in an illustrative, rather than a restrictive.
Claims (27)
1. current sensing means, the sensing module that comprises the integration amplification module and have the Rogowski coil to consist of, it is characterized in that, also comprise standard variable voltage constant pressure source and the dividing potential drop conversion module with several range wave bands in the described device, the input end of described dividing potential drop conversion module optionally is connected with described sensing module or standard variable voltage constant pressure source, and the output terminal of this dividing potential drop conversion module is connected in described integration amplification module.
2. current sensing means according to claim 1, it is characterized in that, described dividing potential drop conversion module comprises sample resistance unit and waver unit, the input end of described sample resistance unit optionally is connected in the output terminal of described sensing module or the output terminal of standard variable voltage constant pressure source, and this sample resistance unit has several variable dividing potential drop output terminals, the input end of described waver unit optionally is connected with a output terminal in this several variable dividing potential drop output terminal, and the output terminal of this waver unit is connected with the input end of described integration amplification module.
3. current sensing means according to claim 2, it is characterized in that, described sample resistance unit comprises successively several divider resistances of series connection, these several divider resistances optionally are connected across the output terminal two ends of described sensing module or the output terminal two ends of described standard variable voltage constant pressure source, and the extension line between the adjacent divider resistance is connected in corresponding variable dividing potential drop output terminal.
4. each described current sensing means in 3 according to claim 1, it is characterized in that, also include the change-over switch module in the described device, the stiff end of described change-over switch module is connected in the input end of described dividing potential drop conversion module, and the switch terminal of this change-over switch module optionally is connected with the output terminal of described sensing module or the output terminal of standard variable voltage constant pressure source.
5. current sensing means according to claim 4, it is characterized in that, the switch terminal of described change-over switch module also optionally so that described sensing module connect successively with described standard variable voltage constant pressure source and be connected with the switch terminal of this change-over switch module.
6. each described current sensing means in 3 according to claim 1, it is characterized in that, also include the voltage follow module in the described device, described voltage follow module accesses between the input end of the output terminal of described dividing potential drop conversion module and described integration amplification module.
7. the method that current sensing means claimed in claim 1 is calibrated is characterized in that, described method may further comprise the steps:
(1) described dividing potential drop conversion module is connected with described sensing module;
(2) with the current load in a normalized current source to sensing module, detect described current sensing means and be in calibration factor under the small-range wave band condition at the dividing potential drop conversion module;
(3) described standard variable voltage constant pressure source is accessed described dividing potential drop conversion module;
(4) detect this current sensing means and be in input and output voltage ratio under the different range wave band conditions at the dividing potential drop conversion module;
(5) obtain this current sensing means according to testing result and be in calibration factor under the different range wave band conditions at the dividing potential drop conversion module.
8. the method that current sensing means is calibrated according to claim 7 is characterized in that, described current sensing means is in calibration factor under the small-range wave band condition at the dividing potential drop conversion module, may further comprise the steps:
(21) the dividing potential drop conversion module is arranged at the electric current I 1 big or small small-range wave band that can be fit to of exporting in this normalized current source;
(22) the dividing potential drop conversion module is arranged under the small-range wave band condition, measures the voltage U 1 at integration amplification module output terminal two ends;
(23) calculate this current sensing means according to following formula and be in calibration factor K1 under the small-range wave band condition at the dividing potential drop conversion module:
K1＝I1/U1。
9. the method that current sensing means is calibrated according to claim 8 is characterized in that, described step (22) is:
The dividing potential drop conversion module is arranged at the range wave band that can be fit to this normalized current source output current size that loads.
10. the method that current sensing means is calibrated according to claim 8, it is characterized in that, also include the voltage follow module in the described device, described voltage follow module accesses between the input end of the output terminal of described dividing potential drop conversion module and described integration amplification module, and described step (3) is:
Described dividing potential drop conversion module is disconnected and being connected of sensing module, and described standard variable voltage constant pressure source is connected with described dividing potential drop conversion module.
11. the method that current sensing means is calibrated according to claim 10 is characterized in that, described detection current sensing means is in input and output voltage ratio under the different range wave band conditions at the dividing potential drop conversion module, may further comprise the steps:
(41) described dividing potential drop conversion module is arranged at one of them range wave band;
(42) size of the voltage U 2 of described standard variable voltage constant pressure source output is set to the numerical value in the current range wave band of this current sensing means;
(43) voltage U 3 at the output terminal two ends of the described integration amplification module of measurement;
(44) according to following formula calculate this current sensing means at the input and output voltage of current range wave band than K3:
K3＝U2/U3；
(45) the range wave band during than K1 is identical if current range wave band is with the input current output voltage that detects this sensing module, and then the second input and output voltage compares K2=K3;
(46) if described current sensing means also exists other range wave band not yet to detect, then described dividing potential drop conversion module switching is arranged at corresponding range wave band, and repeats above-mentioned steps (42).
12. the method that current sensing means is calibrated according to claim 11 is characterized in that, the described current sensing means that obtains is in calibration factor under the different range wave band conditions at the dividing potential drop conversion module, is specially:
Calculate this current sensing means according to following formula and be in calibration factor K under the different range wave band conditions at the dividing potential drop conversion module:
K3/K2 under K=K1 * corresponding range wave band.
13. the method that current sensing means is calibrated according to claim 11 is characterized in that, described step (1) is further comprising the steps of before:
(A1) described dividing potential drop conversion module is disconnected and being connected of sensing module;
(A2) with the current load in a normalized current source to sensing module, detect the internal resistance of Rogowski coil in the independent input electric current output voltage ratio, sensing module of this sensing module and the resistance of dividing potential drop conversion module input end.
14. the method that current sensing means is calibrated according to claim 13, it is characterized in that, the internal resistance of Rogowski coil and the resistance of dividing potential drop conversion module input end in the independent input electric current output voltage ratio of described detection sensing module, the sensing module may further comprise the steps:
(A21) this normalized current source output current Is;
(A22) measure the voltage U s at these sensing module output terminal two ends;
(A23) the input current output voltage that calculates this sensing module according to following formula is than Ks:
Ks＝Is/Us；
(A24) measure the resistance R s at the output terminal two ends of Rogowski coil in this sensing module;
(A25) measure the resistance R _ f at these dividing potential drop conversion module input end two ends.
15. the method that current sensing means is calibrated according to claim 14 is characterized in that, the described current sensing means that obtains is in calibration factor under the different range wave band conditions at the dividing potential drop conversion module, is specially:
Calculate this current sensing means according to following formula and be in calibration factor K under the different range wave band conditions at the dividing potential drop conversion module:
K3 under K=Ks * different range wave bands * (Rf+Rs)/(Rf).
16. the method that current sensing means is calibrated according to claim 8, it is characterized in that, also include the change-over switch module in the described current sensing means, the stiff end of described change-over switch module is connected in the input end of described dividing potential drop conversion module, and optionally so that described sensing module is connected successively with described standard variable voltage constant pressure source and is connected with the switch terminal of this change-over switch module, described step (3) is the switch terminal of this change-over switch module:
Described sensing module is connected successively with described standard variable voltage constant pressure source and be connected with the switch terminal of this change-over switch module.
17. the method that current sensing means is calibrated according to claim 16 is characterized in that, described detection current sensing means is in input and output voltage ratio under the different range wave band conditions at the dividing potential drop conversion module, may further comprise the steps:
(41) described dividing potential drop conversion module is arranged at one of them range wave band;
(42) size of the voltage U 2 of described standard variable voltage constant pressure source output is set to the numerical value in the current range wave band of this current sensing means;
(43) voltage U 3 at the output terminal two ends of the described integration amplification module of measurement;
(44) according to following formula calculate this current sensing means at the input and output voltage of current range wave band than K3:
K3＝U2/U3；
(45) the range wave band during than K1 is identical if current range wave band is with the input current output voltage that detects this sensing module, and then the second input and output voltage compares K2=K3;
(46) if described current sensing means also exists other range wave band not yet to detect, then described dividing potential drop conversion module switching is arranged at corresponding range wave band, and repeats above-mentioned steps (42).
18. the method that current sensing means is calibrated according to claim 17 is characterized in that, the described current sensing means that obtains is in calibration factor under the different range wave band conditions at the dividing potential drop conversion module, is specially:
Calculate this current sensing means according to following formula and be in calibration factor K under the different range wave band conditions at the dividing potential drop conversion module:
K3/K2 under K=K1 * corresponding range wave band.
19. the method that current sensing means is calibrated according to claim 17 is characterized in that, described step (1) is further comprising the steps of before:
(A1) described dividing potential drop conversion module is disconnected and being connected of sensing module;
(A2) with the current load in a normalized current source to sensing module, detect the independent input electric current output voltage ratio of this sensing module.
20. the method that current sensing means is calibrated according to claim 19 is characterized in that, the independent input electric current output voltage ratio of described detection sensing module may further comprise the steps:
(A21) this normalized current source output current Is;
(A22) measure the voltage U s at these sensing module output terminal two ends;
(A23) the input current output voltage that calculates this sensing module according to following formula compares Ks:Ks=Is/Us.
21. the method that current sensing means is calibrated according to claim 20 is characterized in that, the described current sensing means that obtains is in calibration factor under the different range wave band conditions at the dividing potential drop conversion module, is specially:
Calculate this current sensing means according to following formula and be in calibration factor K under the different range wave band conditions at the dividing potential drop conversion module:
K3 under K=Ks * different range wave bands.
22. the method that current sensing means is calibrated according to claim 8 is characterized in that, described step (3) is:
Described dividing potential drop conversion module is disconnected and being connected of sensing module, and described standard variable voltage constant pressure source is connected with described dividing potential drop conversion module.
23. the method that current sensing means is calibrated according to claim 22 is characterized in that, described detection current sensing means is in input and output voltage ratio under the different range wave band conditions at the dividing potential drop conversion module, may further comprise the steps:
(41) described dividing potential drop conversion module is arranged at one of them range wave band;
(42) size of the voltage U 2 of described standard variable voltage constant pressure source output is set to the numerical value in the current range wave band of this current sensing means;
(43) voltage U 3 at the output terminal two ends of the described integration amplification module of measurement;
(44) according to following formula calculate this current sensing means at the input and output voltage of current range wave band than K3:
K3＝U2/U3；
(45) the range wave band during than K1 is identical if current range wave band is with the input current output voltage that detects this sensing module, and then the second input and output voltage compares K2=K3;
(46) if described current sensing means also exists other range wave band not yet to detect, then described dividing potential drop conversion module switching is arranged at corresponding range wave band, and repeats above-mentioned steps (42).
24. the method that current sensing means is calibrated according to claim 23 is characterized in that, described step (1) is further comprising the steps of before:
(A1) described dividing potential drop conversion module is disconnected and being connected of sensing module;
(A2) internal resistance, this dividing potential drop conversion module of detecting Rogowski coil in this sensing module are in the input pickup resistance under the different range wave band conditions, the independent input electric current output voltage ratio of this sensing module.
25. the method that current sensing means is calibrated according to claim 24, it is characterized in that, the internal resistance of Rogowski coil in the described sensing module, described dividing potential drop conversion module are in the independent input electric current output voltage ratio of the input pickup resistance under the different range wave band conditions, described sensing module, may further comprise the steps:
(A21) this normalized current source output current Is;
(A22) measure the voltage U s at these sensing module output terminal two ends;
(A23) the input current output voltage that calculates this sensing module according to following formula is than Ks:
Ks＝Is/Us；
(A24) this normalized current source output current is closed;
(A25) measure the resistance R s at the output terminal two ends of Rogowski coil in this sensing module;
(A26) measure this dividing potential drop conversion module and be in input pickup resistance R3 under the different range wave band conditions;
(A27) the range wave band during than K1 is identical if current range wave band is with the input current output voltage that detects this sensing module, then the second input pickup resistance R2=R3;
(A28) if described current sensing means also exists other range wave band not yet to detect, then described dividing potential drop conversion module switching is arranged at corresponding range wave band, and repeats above-mentioned steps (A26).
26. the method that current sensing means is calibrated according to claim 25 is characterized in that, the described current sensing means that obtains is in calibration factor under the different range wave band conditions at the dividing potential drop conversion module, is specially:
Calculate this current sensing means according to following formula and be in calibration factor K under the different range wave band conditions at the dividing potential drop conversion module:
K3 under K=Ks * corresponding range wave band * (R3+Rs under the corresponding range wave band)/(R3 under the corresponding range wave band).
27. the method that current sensing means is calibrated according to claim 25 is characterized in that, the described current sensing means that obtains is in calibration factor under the different range wave band conditions at the dividing potential drop conversion module, is specially:
Calculate this current sensing means according to following formula and be in calibration factor K under the different range wave band conditions at the dividing potential drop conversion module:
K3/K2 under K=K1 * corresponding range wave band * (R3+Rs under the corresponding range wave band)/(R2+Rs under the corresponding range wave band).
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Also Published As
| Publication number | Publication date |
|---|---|
| WO2008083610A1 (en) | 2008-07-17 |
| CN101216542A (en) | 2008-07-09 |
| CN101256204A (en) | 2008-09-03 |
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