CN108710731B - Method for judging by-pass event by sections - Google Patents
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- CN108710731B CN108710731B CN201810401754.6A CN201810401754A CN108710731B CN 108710731 B CN108710731 B CN 108710731B CN 201810401754 A CN201810401754 A CN 201810401754A CN 108710731 B CN108710731 B CN 108710731B
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- G06F30/30—Circuit design
- G06F30/36—Circuit design at the analogue level
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Abstract
A method for judging the subsection of the bypass event is characterized in that: it comprises the following steps: (1) dividing a multi-segment segmented interval according to the magnitude of phase current in advance, and setting different bypass threshold values in each segment of segmented interval; (2) reading the maximum phase current from a metering chip phase current register; (3) judging the subsection interval where the maximum phase current is located and acquiring a bypass threshold value; (4) reading a three-phase current vector sum from a metering chip current vector sum register and reading a zero-phase current from a metering chip zero-phase current register; (5) and performing vector summation on the three-phase current vector sum and the zero-phase current, and judging whether a bypass event occurs. The subsection judgment method of the bypass event is simple in operation and is not easy to cause misjudgment under the condition of increasing the current.
Description
Technical Field
The invention relates to the technical field of circuit detection, in particular to a method for judging a bypass event in a segmented manner.
Background
The existing bypass event judgment methods mainly comprise two methods:
1. and calculating an included angle between each phase of current according to the voltage phase angle and the power angle, then calculating the vector sum of each phase of current and the zero line of current, and judging whether a bypass event occurs according to whether the vector sum is zero or not.
2. Reading out the three-phase current vector sum from the metering chip current vector sum register, then making a difference with the zero-phase current, and if the difference value is more than 2A, judging that a bypass event occurs.
However, the existing bypass event judgment method has the following technical problems: the complexity of the scheme 1 is high, and the operation load of a main chip is increased; in the case of increasing the current in the scheme 2, the error of the three-phase current vector sum read from the metering chip is large, so that misjudgment is easily caused.
Disclosure of Invention
The technical problem to be solved by the invention is as follows: provided is a method for judging by sections a bypass event, which is simple in operation and less likely to cause erroneous judgment even when a current is increased.
The technical solution of the invention is as follows: a method for judging by-pass events in a segmented manner is characterized in that: it comprises the following steps:
(1) dividing a plurality of segmented intervals according to the magnitude of phase current in advance, and setting different bypass threshold values according to the error change characteristics of the actual three-phase current vector sum of different segmented intervals;
(2) reading the maximum phase current from a metering chip phase current register;
(3) judging the subsection interval where the maximum phase current is located, and acquiring a bypass threshold value according to the subsection interval where the maximum phase current is located;
(4) reading a three-phase current vector sum from a metering chip current vector sum register and reading a zero-phase current from a metering chip zero-phase current register;
(5) and performing vector summation on the three-phase current vector sum and the zero-phase current, judging whether the magnitude of the obtained vector sum is larger than a bypass threshold value, if so, judging that a bypass event occurs, and if not, judging that the bypass event does not occur.
After the method is adopted, the invention has the following advantages:
the method for judging the bypass event in the segmented mode is divided into a plurality of segments according to the phase current, and different bypass thresholds are set according to the error change characteristics of the actual three-phase current vector sum of different segmented intervals, so that the misjudgment of the bypass event can be avoided; and the whole judgment process only needs to compare the relation between the vector sum of the three-phase current and the difference value of the zero-phase current and the bypass threshold value, and the operation is very simple.
Preferably, the step (1) includes a first segment section and a second segment section in sequence from small to large according to the magnitude of the phase current, the bypass threshold value in the first segment section is a constant empirical value, and the bypass threshold value in the second segment section is increased according to a certain linear proportion of the maximum phase current change value on the basis of the empirical value. According to the method, a traditional empirical value is taken as a bypass threshold value under the condition that the maximum phase current is small, the operation is convenient and accurate, and under the condition that the maximum phase current is large, the error of the three-phase current vector sum is approximately exponentially increased along with the increase of the maximum phase current, the bypass threshold value is set to be linearly increased, on one hand, the bypass threshold value is closer to the exponential increase, and on the other hand, the operation is simpler than the exponential increase.
Preferably, the system further comprises a third segment interval arranged after the second segment interval, wherein the bypass threshold value in the third segment interval is a constant saturation value, and the saturation value is equal to the maximum bypass threshold value in the second segment interval. Because the error of the three-phase current vector sum under the balanced condition cannot be increased infinitely under the condition that the maximum phase current is increased, but reaches a stable value, namely after the maximum phase current is increased to a certain value, the error of the three-phase current vector sum cannot be increased any more, but reaches a constant saturated value, the setting of the third subsection interval truly simulates the error change characteristic of the actual three-phase current vector sum, and the judgment of the bypass event is more accurate.
Preferably, the range of the first segment section of the phase current is [0,20], the range of the second segment section is (20,50], the range of the third segment section is (50, 100), and the unit is A.
Preferably, the empirical value in the first segment is 1.5A to 2.5A, the bypass threshold value in the second segment is increased in a linear proportion of 1/11 to 1/9 to the maximum phase current change value based on the empirical value, and the saturation value in the third segment is 4A to 5A. The parameter interval is a better interval, so that the judgment of the bypass event is more accurate.
Preferably, the empirical value in the first segment is 2A, the bypass threshold value in the second segment is increased in a linear proportion of 1/10, which is the maximum phase current change value, based on the empirical value, and the saturation value in the third segment is 5A. The parameter interval is an optimal interval, so that the judgment of the bypass event can be most accurate.
Description of the drawings:
FIG. 1 is a schematic diagram of the selection of maximum phase current and bypass threshold values in accordance with the present invention;
Detailed Description
The invention is further described with reference to the following embodiments in conjunction with the accompanying drawings.
Example (b):
a method for judging the segments of bypass events comprises the following steps:
(1) dividing a plurality of segmented intervals according to the magnitude of phase current in advance, and setting different bypass threshold values according to the error change characteristics of the actual three-phase current vector sum of different segmented intervals;
(2) reading the maximum phase current from a metering chip phase current register;
(3) judging the subsection interval where the maximum phase current is located, and acquiring a bypass threshold value according to the subsection interval where the maximum phase current is located;
(4) reading a three-phase current vector sum from a metering chip current vector sum register and reading a zero-phase current from a metering chip zero-phase current register;
(5) and performing vector summation on the three-phase current vector sum and the zero-phase current, judging whether the magnitude of the obtained vector sum is larger than a bypass threshold value, if so, judging that a bypass event occurs, and if not, judging that the bypass event does not occur.
The method for judging the bypass event in the segmented mode is divided into a plurality of segments according to the phase current, and different bypass thresholds are set according to the error change characteristics of the actual three-phase current vector sum of different segmented intervals, so that the misjudgment of the bypass event can be avoided; and the whole judgment process only needs to compare the relation between the difference value of the three-phase current vector sum and the zero-phase current and the bypass threshold value, and the operation is very simple.
Preferably, the step (1) includes a first segment section and a second segment section in sequence from small to large according to the magnitude of the phase current, the bypass threshold value in the first segment section is a constant empirical value, and the bypass threshold value in the second segment section is increased according to a certain linear proportion of the maximum phase current change value on the basis of the empirical value. According to the method, a traditional empirical value is taken as a bypass threshold value under the condition that the maximum phase current is small, the operation is convenient and accurate, and under the condition that the maximum phase current is large, the error of the three-phase current vector sum is approximately exponentially increased along with the increase of the maximum phase current, the bypass threshold value is set to be linearly increased, on one hand, the bypass threshold value is closer to the exponential increase, and on the other hand, the operation is simpler than the exponential increase.
Preferably, the system further comprises a third segment interval arranged after the second segment interval, wherein the bypass threshold value in the third segment interval is a constant saturation value, and the saturation value is equal to the maximum bypass threshold value in the second segment interval. Because the error of the three-phase current vector sum under the balanced condition cannot be increased infinitely under the condition that the maximum phase current is increased, but reaches a stable value, namely after the maximum phase current is increased to a certain value, the error of the three-phase current vector sum cannot be increased any more, but reaches a constant saturated value, the setting of the third subsection interval truly simulates the error change characteristic of the actual three-phase current vector sum, and the judgment of the bypass event is more accurate.
Preferably, the range of the first segment section of the phase current is [0,20], the range of the second segment section is (20,50], the range of the third segment section is (50, 100), and the unit is A.
Preferably, the empirical value in the first segment interval is 1.5A to 2.5A, the bypass threshold value in the second segment interval is increased in a linear proportion of 1/11 to 1/9 to the maximum phase current change value based on the empirical value, and the saturation value in the third segment interval is 4A to 5A. The parameter interval is a better interval, so that the judgment of the bypass event is more accurate.
Preferably, the empirical value in the first segment interval is 2A, the bypass threshold value in the second segment interval is increased in a linear proportion of 1/10, which is the maximum phase current change value, based on the empirical value, and the saturation value in the third segment interval is 5A. The parameter interval is an optimal interval, so that the judgment of the bypass event can be most accurate.
Claims (4)
1. A method for judging by-pass events in a segmented manner is characterized in that: it comprises the following steps:
(1) dividing a plurality of segmented intervals according to the magnitude of phase current in advance, and setting different bypass threshold values according to the error change characteristics of the actual three-phase current vector sum of different segmented intervals; the method comprises the steps that a first subsection interval and a second subsection interval are sequentially included from small to large according to the magnitude of phase current, a bypass threshold value in the first subsection interval is a constant empirical value, and the bypass threshold value in the second subsection interval is increased according to a certain linear proportion of a maximum phase current change value on the basis of the empirical value; the bypass threshold value in the third subsection interval is a constant saturation value, and the saturation value is equal to the maximum bypass threshold value in the second subsection interval;
(2) reading the maximum phase current from a metering chip phase current register;
(3) judging the subsection interval where the maximum phase current is located, and acquiring a bypass threshold value according to the subsection interval where the maximum phase current is located;
(4) reading a three-phase current vector sum from a metering chip current vector sum register and reading a zero-phase current from a metering chip zero-phase current register;
(5) and performing vector summation on the three-phase current vector sum and the zero-phase current, judging whether the magnitude of the obtained vector sum is larger than a bypass threshold value, if so, judging that a bypass event occurs, and if not, judging that the bypass event does not occur.
2. The method for determining by-pass event segmentation as claimed in claim 1, wherein: the range of the first subsection of the phase current is [0,20], the range of the second subsection is (20,50], and the range of the third subsection is (50,100], unit: A.
3. The method of claim 2, wherein the step of determining the by-pass event comprises: the empirical value in the first segment interval is 1.5A-2.5A, the bypass threshold value in the second segment interval is increased in a linear proportion of 1/11-1/9 of the maximum phase current change value on the basis of the empirical value, and the saturation value in the third segment interval is 4A-5A.
4. The method of claim 3, wherein the step of determining the by-pass event comprises: the empirical value in the first segment interval is 2A, the bypass threshold value in the second segment interval is increased in a linear proportion of 1/10, which is the maximum phase current change value, based on the empirical value, and the saturation value in the third segment interval is 5A.
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Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2057038U (en) * | 1989-09-25 | 1990-05-09 | 浙江省平阳县敖江电子技术中心仪器厂 | Multifuncitonal protector for limiting consumption of electricity, over-current, leakage and avoiding or indicating fraudulent use of electricity |
| AU7373291A (en) * | 1990-04-09 | 1991-10-10 | Prospect County Council, The | Electric line interference detector |
| CN1138389A (en) * | 1994-09-29 | 1996-12-18 | Abb研究有限公司 | Current-limiting device |
| CN1592288A (en) * | 2003-08-14 | 2005-03-09 | Lg电子株式会社 | Automatic frequency control device and mehtod of QPSK modulation system |
| CN103076478A (en) * | 2012-12-18 | 2013-05-01 | ***通信集团湖南有限公司湘潭分公司 | Anti-electricity larceny method, device and system for communication base station |
| CN104868757A (en) * | 2015-05-15 | 2015-08-26 | 西安理工大学 | Method for estimating initial value of virtual flux linkage vector of PWM rectifier |
| CN105093160A (en) * | 2015-07-28 | 2015-11-25 | 宁波三星电气股份有限公司 | Segmented compensation method for errors of electric energy meter |
| CN107478881A (en) * | 2017-08-16 | 2017-12-15 | 深圳市思达仪表有限公司 | Three-phase electric energy meter by-pass current detection method and its system |
-
2018
- 2018-04-28 CN CN201810401754.6A patent/CN108710731B/en active Active
Patent Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2057038U (en) * | 1989-09-25 | 1990-05-09 | 浙江省平阳县敖江电子技术中心仪器厂 | Multifuncitonal protector for limiting consumption of electricity, over-current, leakage and avoiding or indicating fraudulent use of electricity |
| AU7373291A (en) * | 1990-04-09 | 1991-10-10 | Prospect County Council, The | Electric line interference detector |
| CN1138389A (en) * | 1994-09-29 | 1996-12-18 | Abb研究有限公司 | Current-limiting device |
| CN1592288A (en) * | 2003-08-14 | 2005-03-09 | Lg电子株式会社 | Automatic frequency control device and mehtod of QPSK modulation system |
| CN103076478A (en) * | 2012-12-18 | 2013-05-01 | ***通信集团湖南有限公司湘潭分公司 | Anti-electricity larceny method, device and system for communication base station |
| CN104868757A (en) * | 2015-05-15 | 2015-08-26 | 西安理工大学 | Method for estimating initial value of virtual flux linkage vector of PWM rectifier |
| CN105093160A (en) * | 2015-07-28 | 2015-11-25 | 宁波三星电气股份有限公司 | Segmented compensation method for errors of electric energy meter |
| CN107478881A (en) * | 2017-08-16 | 2017-12-15 | 深圳市思达仪表有限公司 | Three-phase electric energy meter by-pass current detection method and its system |
Non-Patent Citations (2)
| Title |
|---|
| K-band HBT and HEMT monolithic active phase shifters using vertor sum method;Po-Yu Chen等;《 IEEE Transactions on Microwave Theory and Techniques》;20040531;第52卷(第5期);第1414-1424页 * |
| 变电所倒闸操作实例分析及操作方式的研究;周勤跃;《科技促进发展 》;20111210;第228-229,245页 * |
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