CN106772191A - A kind of method for improving current transformer control accuracy, device and current transformer - Google Patents
A kind of method for improving current transformer control accuracy, device and current transformer Download PDFInfo
- Publication number
- CN106772191A CN106772191A CN201611065359.2A CN201611065359A CN106772191A CN 106772191 A CN106772191 A CN 106772191A CN 201611065359 A CN201611065359 A CN 201611065359A CN 106772191 A CN106772191 A CN 106772191A
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- current transformer
- value
- sensor
- amendment
- switch position
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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
- G01R35/02—Testing or calibrating of apparatus covered by the other groups of this subclass of auxiliary devices, e.g. of instrument transformers according to prescribed transformation ratio, phase angle, or wattage rating
Abstract
The invention discloses a kind of method for improving current transformer control accuracy, device and current transformer, method comprises the following steps：S1. predetermined a reference value is detected to the precision of sensor, determines the actual measured deviation value of sensor；S2. the measurement result value of sensor is modified as correction value with the actual measured deviation value, the final measurement value with revised value as sensor.There is the present invention simple, efficient, can be effectively to sensor sampled value to be modified, and the sampling precision of sensor be improved, so as to improve current transformer control accuracy, low cost and other advantages.
Description
Technical field
The present invention relates to converter topology field, more particularly to a kind of method for improving current transformer control accuracy, device and
Current transformer.
Background technology
With the development of science and technology, the application of current transformer is more and more extensive., it is necessary to pass through to pass in the control process of current transformer
Sensor gathers the parameters such as electric current, the voltage of current transformer as control feedback information, in order to improve the control accuracy of current transformer, to passing
The precision of sensor and the requirement more and more higher of sampling precision.Sensor accuracy traditional at present is usual 2% ~ 5% or so, to control
The precision of required precision processed operating mode lower sensor very high is usually required that less than less than 1%, even lower；Sampling precision error is led to
Often require to be less than 0.5%.But high-precision sensor and sample circuit are often expensive, increased whole current transformer into
This, makes product lack competitiveness.
In the control process of current transformer, sensor directly influences current transformer to the precision of voltage, the sampled value of electric current
Control accuracy, directly affect current transformer including voltage, current harmonics, the control performance of the aspect such as error protection, if adopted
Sample error deviates to a certain extent, and resulting even in current transformer cannot work.
In order to improve the accuracy of the whole analog acquisition of sensor, conventional method is to improve sampling precision and sensing
Device precision in itself.It is within by the precision raising of ordinary sensors precision 3% to 1% that is, common opened loop control is former
The voltage sensor of reason changes the sensor of closed loop principle into, and both prices differ 8 to 10 times.
The content of the invention
The technical problem to be solved in the present invention is that：For the technical problem that prior art is present, the present invention provides one
Plant simple, efficient, can be effectively to sensor sampled value to be modified, the sampling precision of sensor is improved, so as to improve change
Stream device control accuracy, the raising method of current transformer control accuracy of low cost, device and current transformer.
In order to solve the above technical problems, technical scheme proposed by the present invention is：A kind of side for improving current transformer control accuracy
Method, comprises the following steps：
S1. predetermined a reference value is detected to the precision of sensor, determines the actual measured deviation value of sensor；
S2. the measurement result value of sensor is modified as correction value with the actual measured deviation value, with revised value
It is the final measurement value of sensor.
With actual measured deviation value it is correction value to sensor described in step S2 as the further improvement of this method
Measurement result value is modified to be realized by a toggle switch being connected with the DCU of current transformer；The switch of the toggle switch
Position is divided into amendment direction switch position and correction value switchs position, and correction value switch position is compiled according to default coded system
Code；The toggle switch state of the amendment direction switch position is set according to the correction value, and the correction value switchs the dial-up of position
On off state is calculated according to the correction value and default amendment scale division value and determined.
Used as the further improvement of this method, the correction value switch position is encoded according to binary coding rule.
Used as the further improvement of this method, the amendment direction switch position includes positive amendment switch position and one
Negative sense amendment switchs position.
Used as the further improvement of this method, the sensor includes current sensor and voltage sensor, the benchmark
It is worth the nominal output values for current transformer, including output-current rating value and rated output voltage value.
A kind of device for improving current transformer control accuracy, including deviation correcting module, the drift correction module and change
The DCU connections of device are flowed, predetermined sensor measurement correction value is provided to the DCU.
Used as the further improvement of the present apparatus, the deviation correcting module is toggle switch；The toggle switch is opened
Off-position is divided into amendment direction switch position and correction value switchs position, and the correction value switch position is compiled according to default coded system
Code.
Used as the further improvement of the present apparatus, the default coded system is binary coding mode.
Used as the further improvement of the present apparatus, the amendment direction switch position includes positive amendment switch position and one
Negative sense amendment switchs position.
A kind of current transformer, including the device for improving current transformer control accuracy as described above.
Compared with prior art, the advantage of the invention is that：
1st, the method for the present invention need not change certainty of measurement sensor higher, it is only necessary to by the measurement result to sensor
It is modified according to predetermined correction value, you can effectively improve to current transformer control accuracy, implementation process is simple, convenient, efficient.
2nd, the present invention need not carry out wholesale revision to existing current transformer and need not put into substantial amounts of new hardware
Equipment, enforcement difficulty is small, and implementation cost is small.
Brief description of the drawings
Fig. 1 is specific embodiment of the invention schematic flow sheet.
Fig. 2 is specific embodiment of the invention structural representation.
Fig. 3 is that specific embodiment of the invention amendment switchs position coding schematic diagram.
Specific embodiment
Below in conjunction with Figure of description and specific preferred embodiment, the invention will be further described, but not therefore and
Limit the scope of the invention.
As shown in figure 1, the method for the raising current transformer control accuracy of the present embodiment, comprises the following steps：S1. to advance
The a reference value of determination detects to the precision of sensor, determines the actual measured deviation value of sensor；S2. with actual measurement
Deviation is modified for correction value to the measurement result value of sensor, the final measurement with revised value as sensor
Value.
In the present embodiment, the measurement result value of sensor is carried out by correction value of actual measured deviation value in step S2
Amendment passes through the DCU of and current transformer（Drive control unit）The toggle switch of connection is realized；The switch position point of toggle switch
It is that amendment direction switch position and correction value switch position, correction value switch position is encoded according to default coded system；Amendment
The toggle switch state of direction switch position is set according to correction value, the toggle switch state of correction value switch position according to correction value and
Default amendment scale division value is calculated and determined.Correction value switch position is encoded according to binary coding rule.Amendment direction switch
Position includes a positive amendment switch position and a negative sense amendment switch position.Sensor includes current sensor and voltage sensor
Device, a reference value is the nominal output values of current transformer, including output-current rating value and rated output voltage value.
In the present embodiment, it is necessary to gather voltage, the electric current of current transformer by sensor in the control process of current transformer
Deng parameter value, DCU（Drive control unit）Current transformer is controlled according to parameter values such as the voltages, electric current for being gathered so that
The voltage and electric current of current transformer output control target.But limited by sensor sample precision, sensor samples what is obtained
There is certain error in the sampled value of voltage and electric current, so as to cause DCU to there is also certain error to the control accuracy of current transformer,
The precise control to current transformer output voltage and electric current cannot be realized.In order to improve the control accuracy of current transformer, existing method
It is the precision for improving sensor, reduces the sampling error of sensor, so as to improve control accuracies of the DCU to current transformer.But, it is low
Price between the sensor of precision and high-precision sensor differs huge, and such as error is 3% sensor and error is 1%
Sensor, its price just differs 8 to 10 times.By research, the sampling error of discovery sensor is linearity error to inventor, and
And, in the operation of current transformer and control process, current transformer is mainly run with specified state, and current transformer is with specified state
During operation, influence of the sensor sampling precision at this moment to the precision controlling of current transformer is great.Current transformer is under rated condition
Control whether it is accurate, it is most important for current transformer.
In the present embodiment, if the rated current of current transformer is 100A, rated voltage is 1000V, with the specified of current transformer
, used as predetermined a reference value, the sampling error to sensor is analyzed for electric current and rated voltage.With current sensor pair
Current value is measured for the electric current of 100A, and measurement result is 95A, then can determine that the measurement error of current sensor is 5%,
Need the forward direction that 5A is given to the measurement result of current sensor to correct, i.e., on the basis of the measured value of current sensor,
Plus 5A, to compensate the measurement error of current sensor, a reference value of 100A is with the absolute value of the difference of the measured value of 95A
To the correction value of current sensor, because the difference is just, that is, to need to carry out positive amendment to current sensor.With voltage sensor
To magnitude of voltage for the voltage of 1000V is measured, measurement result is 1050V to device, then can determine that the measurement of voltage sensor is missed
Difference is 5%, it is necessary to give the negative sense amendment of 50V to the measurement result of voltage sensor, i.e., in the measured value of voltage sensor
On the basis of subtract 50V, with the measurement error of offset voltage sensor, a reference value of 1000V and the difference of the measured value of 1050V
Absolute value is the correction value to voltage sensor, because the difference is negative, that is, needs to carry out negative sense amendment to voltage sensor.
Also, main influence is produced on current transformer control accuracy be as caused by sensor self character be constant error, rather than
Random error.Therefore DCU is repaiied according still further to correction value after sensor sample obtains sampled value to the sampled value of sensor
After just, you can obtain accuracy actual value high, then the value of feedback that the actual value is controlled as DCU to current transformer, from
And improve the control accuracy of current transformer.
In the present embodiment, as shown in Fig. 2 being realized by toggle switch to the correction value of sensor, for each sensing
Device, is respectively provided with a toggle switch and corresponds to therewith, for sensor provides correction value.One end of toggle switch connects the I/O of DCU
End, other end ground connection or normal voltage.By taking 8 toggle switch as an example, it is to the process that above-mentioned current sensor is modified：
S0 of toggle switch is set for negative sense amendment switchs position, S1 is positive amendment switch position, and totally 6 switch positions are to repair to S2 to S7
On the occasion of switch position, and encoded by binary coding rule from low to high according to S2 to S7, then correction value switch position one
2 can be provided to DCU altogether6- 1 totally 63 kinds of different amendment states.The amendment indexing for setting toggle switch is 0.1A, then dial-up is opened
The correction value scope that pass can provide is 0 to 6.3A, coordinates amendment direction switch position, and extent of amendment is -6.3A to+6.3A.
In the present embodiment, as described above, needing to provide the positive amendment of 5A to current sensor, then need to dial S0 of toggle switch
To off-state, conducting state is allocated to by S1, while correction value switch position is set into 110010,1 expression from S7 to S2 should
Switch position is conducting state, and 0 represents that switch position is off-state.The state of correction value switch position and the corresponding relation of correction value
As shown in Figure 3.It is configured by the position to toggle switch, you can it is determined that being modified to the sampled value of current sensor.
It is more punctual in current transformer factory testing that the setting of toggle switch is only needed to, and is configured more on time i.e. in the maintenance of current transformer
Can, set very convenient.Amendment indexing can flexibly be set, and be in the present embodiment 0.1A, naturally it is also possible to which any setting is repaiied
Positive indexing, certainly, amendment scale division value is smaller, then amendment precision is also higher, but for digit identical toggle switch, its amendment model
Enclose value also smaller.Scale division value is such as corrected for 0.05A, then for 8 toggle switch, extent of amendment is -3.15A to+3.15A, such as
Need to expand extent of amendment, then need using the toggle switch with more multidigit.Same method can be used for voltage sensor
The amendment of sampled value.
As shown in Fig. 2 the device of the raising current transformer control accuracy of the present embodiment, including deviation correcting module, deviation
Correcting module is connected with the DCU of current transformer, and predetermined sensor measurement correction value is provided to DCU.Deviation amendment
Module is toggle switch；The switch position of toggle switch is divided into amendment direction switch position and correction value switchs position, correction value switch position
Encoded according to default coded system.One end of toggle switch connects the I/O ends of DCU, other end ground connection or normal voltage.
Default coded system is binary coding mode.Amendment direction switch position includes positive amendment switch position and a negative sense
Amendment switch position.
The current transformer of the present embodiment, including above-mentioned raising current transformer control accuracy device.
Above-mentioned simply presently preferred embodiments of the present invention, not makees any formal limitation to the present invention.Although of the invention
It is disclosed above with preferred embodiment, but it is not limited to the present invention.Therefore, it is every without departing from technical solution of the present invention
Content, according to the technology of the present invention essence to any simple modification, equivalent variation and modification made for any of the above embodiments, all should fall
In the range of technical solution of the present invention protection.
Claims (10)
1. it is a kind of improve current transformer control accuracy method, it is characterised in that comprise the following steps：
S1. predetermined a reference value is detected to the precision of sensor, determines the actual measured deviation value of sensor；
S2. the measurement result value of sensor is modified as correction value with the actual measured deviation value, with revised value
It is the final measurement value of sensor.
2. it is according to claim 1 improve current transformer control accuracy method, it is characterised in that：With reality described in step S2
Border measured deviation value be correction value the measurement result value of sensor is modified by one be connected with the DCU of current transformer group
Code switch is realized；The switch position of the toggle switch is divided into amendment direction switch position and correction value switchs position, to the correction value
Switch position is encoded according to default coded system；The toggle switch state of the amendment direction switch position is according to the amendment
Value is set, and the toggle switch state of the correction value switch position calculates true according to the correction value and default amendment scale division value
It is fixed.
3. it is according to claim 2 improve current transformer control accuracy method, it is characterised in that：The correction value switchs position
Encoded according to binary coding rule.
4. it is according to claim 3 improve current transformer control accuracy method, it is characterised in that：The amendment direction switch
Position includes a positive amendment switch position and a negative sense amendment switch position.
5. according to any one of Claims 1-4 raising current transformer control accuracy method, it is characterised in that：The biography
Sensor include current sensor and voltage sensor, a reference value for current transformer nominal output values, including rated output electricity
Flow valuve and rated output voltage value.
6. it is a kind of improve current transformer control accuracy device, it is characterised in that：Including deviation correcting module, the drift correction
Module is connected with the DCU of current transformer, and predetermined sensor measurement correction value is provided to the DCU.
7. it is according to claim 6 improve current transformer control accuracy device, it is characterised in that：The deviation amendment mould
Block is toggle switch；The switch position of the toggle switch is divided into amendment direction switch position and correction value switchs position, the correction value
Switch position is encoded according to default coded system.
8. it is according to claim 7 improve current transformer control accuracy device, it is characterised in that：The default coding staff
Formula is binary coding mode.
9. it is according to claim 8 improve current transformer control accuracy device, it is characterised in that：The amendment direction switch
Position includes a positive amendment switch position and a negative sense amendment switch position.
10. a kind of current transformer, it is characterised in that：Including the raising current transformer control accuracy as described in any one of claim 6 to 9
Device.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201611065359.2A CN106772191A (en) | 2016-11-28 | 2016-11-28 | A kind of method for improving current transformer control accuracy, device and current transformer |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201611065359.2A CN106772191A (en) | 2016-11-28 | 2016-11-28 | A kind of method for improving current transformer control accuracy, device and current transformer |
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| CN106772191A true CN106772191A (en) | 2017-05-31 |
Family
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| Application Number | Title | Priority Date | Filing Date |
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| CN201611065359.2A Pending CN106772191A (en) | 2016-11-28 | 2016-11-28 | A kind of method for improving current transformer control accuracy, device and current transformer |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112510973A (en) * | 2020-12-29 | 2021-03-16 | 大禹电气科技股份有限公司 | Voltage or current calibration method of frequency converter, frequency converter and system |
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| RU2011148762A (en) * | 2011-12-01 | 2013-06-10 | Федеральное государственное бюджетное образовательное учреждение высшего профессионального образования "Московский государственный индустриальный университет" | LINEAR MOVEMENT CONVERTER TO VOLTAGE |
| CN103166567A (en) * | 2011-12-19 | 2013-06-19 | Ls产电株式会社 | Apparatus and method for compensating offset of current sensor |
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| CN2171859Y (en) * | 1993-06-08 | 1994-07-13 | 贝鸥 | Computer detecting instrument for tobacco moisture |
| US6903670B1 (en) * | 2002-10-04 | 2005-06-07 | Smal Camera Technologies | Circuit and method for cancellation of column pattern noise in CMOS imagers |
| CN1497259A (en) * | 2002-10-10 | 2004-05-19 | ������������ʽ���� | Direct earth detector and system connecting generating device using it |
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| RU2011148762A (en) * | 2011-12-01 | 2013-06-10 | Федеральное государственное бюджетное образовательное учреждение высшего профессионального образования "Московский государственный индустриальный университет" | LINEAR MOVEMENT CONVERTER TO VOLTAGE |
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| CN112510973A (en) * | 2020-12-29 | 2021-03-16 | 大禹电气科技股份有限公司 | Voltage or current calibration method of frequency converter, frequency converter and system |
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Application publication date: 20170531 |