CN103760413A - Current detection system of fault indicator and current detection low-temperature compensation method of fault indicator - Google Patents
Current detection system of fault indicator and current detection low-temperature compensation method of fault indicator Download PDFInfo
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Abstract
The invention discloses a current detection low-temperature compensation method of a fault indicator and a current detection system of the fault indicator. The current detection low-temperature compensation method of the fault indicator comprises the steps of determining a temperature working interval, dividing the temperature working interval into a plurality of characteristic temperature subintervals, obtaining a reference mapping table formed by a current value sequence and a sampling value sequence of the higher temperature side of endpoints of each characteristic temperature subinterval, calculating the sampling value linear change rate of each characteristic temperature subinterval, defining the sampling value sequence of the endpoints of each characteristic temperature subinterval as a basis matrix of the characteristic temperature subinterval, determining the characteristic temperature subinterval which the current environment temperature belongs to, calculating a compensation matrix corresponding to the current environment temperature, calculating a calibration table matrix according to the compensation matrix, and searching for current values corresponding to sampling values at the current environment temperature according to the calibration table matrix. According to the scheme, the effect that the actual current values are accurately detected in the low-temperature environment is achieved, and detection accuracy of small currents in the low-temperature environment is improved.
Description
Technical field
The present invention relates to fault current detection field, relate in particular to a kind of fault detector current detecting system and current detecting low temperature compensating method.
Background technology
As everyone knows, fault detector is mainly used on distribution line, is used for judging short trouble or the earth fault of distribution line.General judge transmission line malfunction according to being exactly the electric current that the detects transmission line of electricity changing features that whether breaks down, if meet fault signature variation, fault detector outwards sends alerting signal, realizes the warning of faulty line.Generally, the temperature range of fault detector work is-40 ℃ to+70 ℃, along with the variation of environment temperature, current value curr on distribution line and the funtcional relationship F (curr of sampled value adc, adc)=0 will change, and this variation can be expressed as G (t, F)=0.
It is G(t0, the F of normal temperature that prior art generally adopts t=t0) calibration program, and this scheme is generalized to the whole temperature operation interval of product.This scheme conventionally can reach very high current detection accuracy when normal temperature and high temperature, be generally ± 2%, but in the face of low temperature environment, current detection accuracy is by obvious variation, general over ± 5%.
Summary of the invention
The technical problem to be solved in the present invention is, for the not high defect of current detection accuracy under prior art low temperature environment, provides fault detector current detecting system and current detecting low temperature compensating method that a kind of current detection accuracy is higher.
The technical solution adopted for the present invention to solve the technical problems is: a kind of fault detector current detecting low temperature compensating method is provided, said method comprising the steps of:
S0. determine the temperature operation interval of described fault detector, and described temperature operation interval is divided into a plurality of characteristic temperatures sub-range;
S1. obtain the basis matrix as each characteristic temperature sub-range by the sampled value sequence at the current value sequence of the end points place temperature upper side in each characteristic temperature sub-range and the reference mapping table that sampled value sequence forms, the sampled value linear change rate that calculates each characteristic temperature sub-range and the end points place that defines each characteristic temperature sub-range;
S2. determine the affiliated characteristic temperature sub-range of current environmental temperature of described fault detector;
S3. according to the sampled value linear change rate in the basis matrix in the reference mapping table in above-mentioned characteristic temperature sub-range, above-mentioned characteristic temperature sub-range and above-mentioned characteristic temperature sub-range, calculate the corresponding compensation matrix of current environmental temperature;
S4. according to above-mentioned compensation matrix, calculate the corresponding correction card matrix of current environmental temperature;
S5. according to above-mentioned correction card matrix searching to the corresponding current value of each sampled value under current environmental temperature.
Preferably, in described step S0, described temperature operation interval is divided into a plurality of characteristic temperatures sub-range and is specially:
The mode increasing progressively according to preset temperature step-length is measured current value and the sampled value at each temperature place in described temperature operation interval, obtain the sampled value that each current value is corresponding on predetermined current interval and change and be linear change with current environmental temperature, using the approximately uniform temperature of sampled value linear change rate in described temperature operation interval as a characteristic temperature sub-range.
Preferably, described temperature operation interval is [40 ℃, 25 ℃].
Preferably, described preset temperature step-length is 5 ℃.
Preferably, described predetermined current interval is [5A, 800A].
Preferably, in described step S3, the formula that calculates the corresponding compensation matrix of current environmental temperature is specially:
Preferably,, in described step S4, the formula that calculates the corresponding correction card matrix of current environmental temperature is specially:
The present invention also provides a kind of fault detector current detecting system, and it comprises sampling unit, current rectifying and wave filtering circuit, CPU, the temperature sensing circuit connecting successively, and described CPU has AD mouth, wherein:
Sampling unit, for the AC sampling voltage of sampling by inductive coil;
Current rectifying and wave filtering circuit, for being direct current sampled voltage by described AC sampling voltage transformation;
Temperature sensing circuit, for detection of current environmental temperature, and reports to CPU by described current environmental temperature;
CPU, be used for receiving described direct current sampled voltage and described current environmental temperature, and obtain the corresponding sampled value of described current environmental temperature according to described direct current sampled voltage, and according to the method described in claim 1-7 any one, the corresponding current value of each sampled value under output current environmental temperature.
Preferably,, described current rectifying and wave filtering circuit is comprised of rectifier bridge.
Preferably, described temperature sensing circuit specifically comprises resistance R 1, resistance R 2, thermistor RT, capacitor C 1 and power supply VCC, the AD mouth of CPU, wherein, one end of resistance R 1 connects power supply VCC, one end of the other end difference contact resistance R2 of resistance R 1 and one end of thermistor RT, the other end of resistance R 2 connects respectively the AD mouth of CPU and one end of capacitor C 1, the other end ground connection of the other end of thermistor RT and capacitor C 1.
Implement technical scheme of the present invention, there is following beneficial effect: by temperature being brought under fault detector current detecting system, take border, characteristic temperature sub-range is reference, employing is to adopting the mode of low temp compensating in arbitrary characteristics temperature sub-range, revise current value actual under arbitrary temp, thereby solved the problem of fault detector current detection accuracy bigger error under cryogenic conditions, reached under low temperature environment and the effect of actual current value accurately detected, also expanded the accuracy of detection of little electric current under low temperature environment simultaneously.
Accompanying drawing explanation
Below in conjunction with drawings and Examples, the invention will be further described, in accompanying drawing:
Fig. 1 is the process flow diagram of fault detector current detecting low temperature compensating method of the present invention;
Fig. 2 is the structural representation of fault detector current detecting system of the present invention;
Fig. 3 is the circuit diagram of temperature sensing circuit of the present invention.
Embodiment
In order to make object of the present invention, technical scheme and advantage clearer, below in conjunction with drawings and Examples, the present invention is further elaborated.Should be appreciated that specific embodiment described herein, only in order to explain the present invention, is not intended to limit the present invention.
Refer to Fig. 1, Fig. 1 is the process flow diagram of fault detector current detecting low temperature compensating method of the present invention, and as shown in Figure 1, the method comprises the following steps:
In step S0, determine the temperature operation interval of described fault detector, and described temperature operation interval is divided into a plurality of characteristic temperatures sub-range; It should be noted that for fault detector larger on the impact of current precision during current detecting under low temperature environment.In the present embodiment, described temperature operation interval is [40 ℃, 25 ℃].
In described step S0, described temperature operation interval is divided into a plurality of characteristic temperatures sub-range and is specially:
The mode increasing progressively according to preset temperature step-length is measured current value and the sampled value at each temperature place in described temperature operation interval, obtain the sampled value that each current value is corresponding on predetermined current interval and change and be linear change with current environmental temperature, using the temperature that in described temperature operation interval, sampled value linear change rate is identical as a characteristic temperature sub-range.In the present embodiment, described preset temperature step-length is 5 ℃, and described predetermined current interval is [5A, 800A].
In step S1, obtain the basis matrix as each characteristic temperature sub-range by the sampled value sequence at the current value sequence of the end points place temperature upper side in each characteristic temperature sub-range and the reference mapping table that sampled value sequence forms, the sampled value linear change rate that calculates each characteristic temperature sub-range and the end points place that defines each characteristic temperature sub-range.
Should be noted that, in temperature operation interval [40 ℃, 25 ℃], every 5 ℃ of current value and sampled values of measuring at these temperature, can obtain, in predetermined current interval [5A, 800A], the sampled value that each current value is corresponding changes and is linear change with current environmental temperature, experimental calculation obtains, temperature operation interval [40 ℃ ,-30 ℃], sampled value linear change rate be 1.1 code values/℃, temperature operation interval [30 ℃ ,-5 ℃], sampled value linear change rate be 0.56 code value/℃, [5 ℃ of temperature operation intervals, + 25 ℃], sampled value linear change rate be 0.3 code value/℃, in order to reduce computation complexity, using the approximately uniform temperature of sampled value linear change rate in described temperature operation interval as a characteristic temperature sub-range, in the present embodiment, by [40 ℃ of temperature operation intervals, 25 ℃] be divided into 3 continuous characteristic temperature sub-ranges, it is [40 ℃, characteristic temperature sub-range,-30 ℃], [30 ℃,-5 ℃] and [5 ℃, characteristic temperature sub-range, + 25 ℃], current environmental temperature is-40 ℃,-30 ℃,-5 ℃ and 25 ℃ of end points that these four temperature are these three continuous characteristic temperature sub-ranges, its each self-corresponding node mapping table is as shown in table 1, it is worth mentioning that, the node mapping table of interval end points place temperature upper side should be chosen in characteristic temperature sub-range, reference mapping table as whole characteristic temperature sub-range.With characteristic temperature sub-range [30 ℃ ,-5 ℃], be example ,-5 ℃ is the higher side of its temperature, and soon the node mapping table of-5 ℃ is as the reference mapping table in whole characteristic temperature sub-range.
Table 1
In the present embodiment, with [40 ℃, characteristic temperature sub-range,-30 ℃], [30 ℃,-5 ℃] and [5 ℃, characteristic temperature sub-range, + 25 ℃] be example, the sampled value sequence at the end points place in above-mentioned characteristic temperature sub-range is as the basis matrix in above-mentioned characteristic temperature sub-range, and the basis matrix in above-mentioned characteristic temperature sub-range is as shown in table 2.
Table 2
In step S2, determine the affiliated characteristic temperature sub-range of current environmental temperature of described fault detector.
In step S3, suppose that the reference mapping table in above-mentioned characteristic temperature sub-range is known, according to the sampled value linear change rate in the basis matrix in above-mentioned characteristic temperature sub-range and above-mentioned characteristic temperature sub-range, calculate the corresponding compensation matrix of current environmental temperature.
In described step S3, the formula that calculates the corresponding compensation matrix of current environmental temperature is specially:
, wherein,
for the corresponding compensation matrix of current environmental temperature,
for the sampled value linear change rate in above-mentioned characteristic temperature sub-range,
basis matrix for above-mentioned characteristic temperature sub-range.
S4. according to above-mentioned compensation matrix, calculate the corresponding correction card matrix of current environmental temperature; In described step S4, the formula that calculates the corresponding correction card matrix of current environmental temperature is specially:
S5. according to above-mentioned correction card matrix searching to the corresponding current value of each sampled value under current environmental temperature.
The corresponding current value of each sampled value while retrieving current environmental temperature as-25 ℃ of take is below example, first, determine that current environmental temperature-25 ℃ belong to [5 ℃, characteristic temperature sub-range,-30 ℃], wherein, the node mapping table of-5 ℃ is as shown in table 1, [5 ℃, characteristic temperature sub-range,-30 ℃] basis matrix as shown in table 2, [5 ℃, characteristic temperature sub-range,-30 ℃] sampled value linear change rate be 0.56 code value/℃, according to the formula in step S3, can calculate-25 ℃ of corresponding compensation matrixs like this, then, the node mapping table of higher side-5 of temperature ℃ is as [5 ℃, characteristic temperature sub-range,-30 ℃] the reference mapping table of reference calibration list, according to the formula in step S4, can calculate-25 ℃ of corresponding correction card matrixes, finally, according to-25 ℃ of corresponding correction card matrixes, can retrieve the corresponding current value of each sampled value at-25 ℃.
One of ordinary skill in the art will appreciate that all or part of step realizing in the various embodiments described above method is to come the hardware that instruction is relevant to complete by program, corresponding program can be stored in a computer read/write memory medium, described storage medium, as ROM/RAM, disk or CD etc.
Incorporated by reference to consulting Fig. 2, Fig. 2 is the structural representation of fault detector current detecting system of the present invention, this fault detector current detecting system comprises sampling unit 1, current rectifying and wave filtering circuit 2, CPU3, the temperature sensing circuit 4 connecting successively, and described CPU3 has AD mouth (not shown), wherein:
Sampling unit 1, for the AC sampling voltage of sampling by inductive coil;
Current rectifying and wave filtering circuit 2, for being direct current sampled voltage by described AC sampling voltage transformation;
CPU3, be used for receiving described direct current sampled voltage and described current environmental temperature, and obtain the corresponding sampled value of described current environmental temperature according to described direct current sampled voltage, and according to fault detector current detecting temperature compensation, the corresponding current value of each sampled value under output current environmental temperature. for follow-up CPU, according to current value, carry out fault judgement, do not repeat them here, because, the present invention is mainly the current detecting issues of temperature compensation for fault detector, rather than failure criterion problem.
In the present embodiment, described current rectifying and wave filtering circuit 2 is comprised of rectifier bridge, and the prior art that the circuit diagram of rectifier bridge is well known to those skilled in the art, does not repeat them here.
Incorporated by reference to consulting Fig. 3, Fig. 3 is the circuit diagram of temperature sensing circuit of the present invention, as shown in Figure 3, described temperature sensing circuit 3 specifically comprises resistance R 1, resistance R 2, thermistor RT, capacitor C 1 and power supply VCC, the AD mouth of CPU, wherein, one end of resistance R 1 connects power supply VCC, one end of the other end difference contact resistance R2 of resistance R 1 and one end of thermistor RT, the other end of resistance R 2 connects respectively the AD mouth of CPU and one end of capacitor C 1, the other end ground connection of the other end of thermistor RT and capacitor C 1.Wherein, thermistor RT is the thermistor of negative temperature coefficient, the temperature variant calibration table of R-T resistance providing according to producer is selected suitable divider resistance R1, makes it the ambient temperature range that accurately detects for being-40 ℃ to 25 ℃, and guarantees that precision is at ± 1 ℃.According to the variation of current environmental temperature, the resistance of thermistor RT can change, therefore only need to detect the voltage at thermistor RT two ends: its resistance also changes accordingly when the voltage at RT two ends changes, corresponding to the temperature variant calibration table of R-T resistance, can learn temperature instantly, not repeat them here.
By temperature being brought under fault detector current detecting system, take border, characteristic temperature sub-range is reference, employing is to adopting the mode of low temp compensating in arbitrary characteristics temperature sub-range, revise current value actual under arbitrary temp, thereby solved the problem of fault detector current detection accuracy bigger error under cryogenic conditions, reached under low temperature environment and the effect of actual current value accurately detected, also expanded the accuracy of detection of little electric current under low temperature environment simultaneously.Adopt low temperature compensating method provided by the invention, experiment showed, current detection accuracy actual under fault detector low temperature environment to be brought up to ± 2%.
The foregoing is only the preferred embodiments of the present invention, be not limited to the present invention, for a person skilled in the art, the present invention can have various modifications and variations.Within the spirit and principles in the present invention all, any modification of doing, be equal to replacement, improvement etc., within all should being included in claim scope of the present invention.
Claims (10)
1. a fault detector current detecting low temperature compensating method, is characterized in that, said method comprising the steps of:
S0. determine the temperature operation interval of described fault detector, and described temperature operation interval is divided into a plurality of characteristic temperatures sub-range;
S1. obtain the basis matrix as each characteristic temperature sub-range by the sampled value sequence at the current value sequence of the end points place temperature upper side in each characteristic temperature sub-range and the reference mapping table that sampled value sequence forms, the sampled value linear change rate that calculates each characteristic temperature sub-range and the end points place that defines each characteristic temperature sub-range;
S2. determine the affiliated characteristic temperature sub-range of current environmental temperature of described fault detector;
S3. according to the sampled value linear change rate in the basis matrix in the reference mapping table in above-mentioned characteristic temperature sub-range, above-mentioned characteristic temperature sub-range and above-mentioned characteristic temperature sub-range, calculate the corresponding compensation matrix of current environmental temperature;
S4. according to above-mentioned compensation matrix, calculate the corresponding correction card matrix of current environmental temperature;
S5. according to above-mentioned correction card matrix searching to the corresponding current value of each sampled value under current environmental temperature.
2. fault detector current detecting low temperature compensating method according to claim 1, is characterized in that, in described step S0, described temperature operation interval is divided into a plurality of characteristic temperatures sub-range and is specially:
The mode increasing progressively according to preset temperature step-length is measured current value and the sampled value at each temperature place in described temperature operation interval, obtain the sampled value that each current value is corresponding on predetermined current interval and change and be linear change with current environmental temperature, using the approximately uniform temperature of sampled value linear change rate in described temperature operation interval as a characteristic temperature sub-range.
3. fault detector current detecting low temperature compensating method according to claim 2, is characterized in that, described temperature operation interval is [40 ℃, 25 ℃].
4. fault detector current detecting low temperature compensating method according to claim 2, is characterized in that, described preset temperature step-length is 5 ℃.
5. fault detector current detecting low temperature compensating method according to claim 2, is characterized in that, described predetermined current interval is [5A, 800A].
6. fault detector current detecting low temperature compensating method according to claim 1, is characterized in that, in described step S3, the formula that calculates the corresponding compensation matrix of current environmental temperature is specially:
7. fault detector current detecting low temperature compensating method according to claim 6, is characterized in that, in described step S4, the formula that calculates the corresponding correction card matrix of current environmental temperature is specially:
8. a fault detector current detecting system, is characterized in that, it comprises sampling unit, current rectifying and wave filtering circuit, CPU, the temperature sensing circuit connecting successively, and described CPU has AD mouth, wherein:
Sampling unit, for the AC sampling voltage of sampling by inductive coil;
Current rectifying and wave filtering circuit, for being direct current sampled voltage by described AC sampling voltage transformation;
Temperature sensing circuit, for detection of current environmental temperature, and reports to CPU by described current environmental temperature;
CPU, be used for receiving described direct current sampled voltage and described current environmental temperature, and obtain the corresponding sampled value of described current environmental temperature according to described direct current sampled voltage, and according to the fault detector current detecting low temperature compensating method described in claim 1-7 any one, the corresponding current value of each sampled value under output current environmental temperature.
9. fault detector current detecting system according to claim 8, is characterized in that, described current rectifying and wave filtering circuit is comprised of rectifier bridge.
10. fault detector current detecting system according to claim 8, it is characterized in that, described temperature sensing circuit specifically comprises resistance R 1, resistance R 2, thermistor RT, capacitor C 1 and power supply VCC, the AD mouth of CPU, wherein, one end of resistance R 1 connects power supply VCC, one end of the other end difference contact resistance R2 of resistance R 1 and one end of thermistor RT, the other end of resistance R 2 connects respectively the AD mouth of CPU and one end of capacitor C 1, the other end ground connection of the other end of thermistor RT and capacitor C 1.
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| CN105425182A (en) * | 2015-11-10 | 2016-03-23 | 科大智能电气技术有限公司 | Current accuracy calibration method for fail indicator production link |
| CN106556732A (en) * | 2015-09-30 | 2017-04-05 | 中兴通讯股份有限公司 | Current detection circuit and electric current detecting method |
| CN107727908A (en) * | 2017-10-26 | 2018-02-23 | 深圳市大源高科有限公司 | Current sampling system |
| CN111650418A (en) * | 2020-06-12 | 2020-09-11 | 江苏易立电气股份有限公司 | Temperature compensation method for intelligent low-voltage shunt sensor |
| CN112015160A (en) * | 2019-05-31 | 2020-12-01 | 北京新能源汽车股份有限公司 | Fault temperature determination method and device |
| CN112617299A (en) * | 2021-01-19 | 2021-04-09 | 河南中烟工业有限责任公司 | Method for detecting temperature of heating cigarette smoking set and method for analyzing temperature stability |
| CN114034919A (en) * | 2021-11-19 | 2022-02-11 | 中国兵器工业集团第二一四研究所苏州研发中心 | Voltage acquisition device based on single chip microcomputer and temperature compensation method thereof |
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| CN114034919B (en) * | 2021-11-19 | 2024-05-24 | 中国兵器工业集团第二一四研究所苏州研发中心 | Voltage acquisition device based on single chip microcomputer and temperature compensation method thereof |
| CN116892960A (en) * | 2023-09-06 | 2023-10-17 | 西安甘鑫科技股份有限公司 | Angle rotary encoder suitable for ultralow temperature environment |
| CN116892960B (en) * | 2023-09-06 | 2023-12-08 | 西安甘鑫科技股份有限公司 | Angle rotary encoder suitable for ultralow temperature environment |
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Application publication date: 20140430 |