CN111077477A - Line selection device and zero sequence current polarity detection and automatic correction method thereof - Google Patents
Line selection device and zero sequence current polarity detection and automatic correction method thereof Download PDFInfo
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- CN111077477A CN111077477A CN201911027128.6A CN201911027128A CN111077477A CN 111077477 A CN111077477 A CN 111077477A CN 201911027128 A CN201911027128 A CN 201911027128A CN 111077477 A CN111077477 A CN 111077477A
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- self
- checking
- correction
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- line selection
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R19/00—Arrangements for measuring currents or voltages or for indicating presence or sign thereof
- G01R19/04—Measuring peak values or amplitude or envelope of ac or of pulses
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R25/00—Arrangements for measuring phase angle between a voltage and a current or between voltages or currents
- G01R25/04—Arrangements for measuring phase angle between a voltage and a current or between voltages or currents involving adjustment of a phase shifter to produce a predetermined phase difference, e.g. zero difference
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- General Physics & Mathematics (AREA)
- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Testing Of Short-Circuits, Discontinuities, Leakage, Or Incorrect Line Connections (AREA)
Abstract
The invention discloses a line selection device and a zero sequence current polarity detection and automatic correction method thereof. The zero sequence current polarity detection method is a phase difference method for comparing self-checking voltage and self-checking current. The automatic correction method comprises the steps of carrying out XOR operation to obtain a new correction mark, then correcting all the phases of the error lines by increasing correction angles, and memorizing correction results, thereby realizing the polarity detection and automatic correction of the zero sequence current transformer. The invention has simple structure, convenient method, easy operation and high efficiency; the invention does not need manual on-site line adjustment, reduces the manual consumption, saves the time, avoids the influence caused by power failure correction when the wrong line is connected, and has important significance for ensuring safe and reliable operation.
Description
Technical Field
The invention relates to the technical field of single-phase grounding protection in an alternating current power supply system, in particular to a line selection device and a zero sequence current polarity detection and automatic correction method thereof.
Background
When a single-phase earth fault occurs, the low-current earth system has small fault current and can operate with a fault for a period of time, but the single-phase earth fault causes the normal phase voltage to be increased, and the fault is possibly expanded due to insulation breakdown, so that a fault line needs to be quickly detected and eliminated.
The phase of the zero sequence voltage and the zero sequence current is required in the line selection algorithm, so that the wiring is required to be correct. The existing line selection device is generally provided with a plurality of lines, the positions of the wiring cabinets are different, manual line inspection is troublesome, if wiring is wrong, line changing also needs a series of complicated processes such as power failure and the like, time is delayed, manpower is consumed, and personal safety can be damaged.
Therefore, a line selection device and a method for detecting and automatically correcting the zero sequence current polarity thereof are urgently needed to be researched.
Disclosure of Invention
In order to fully realize the above purpose, the invention provides a line selection device and a method for detecting and automatically correcting the polarity of zero sequence current thereof aiming at the defects in the prior art.
In order to achieve the purpose, the invention adopts the following technical means:
the utility model provides a line selection device, includes the line selection device body, be equipped with self-checking power input terminal, self-checking voltage current output terminal, self-checking voltage input terminal and self-checking current input terminal on the line selection device body, self-checking power input terminal, self-checking voltage current output terminal, self-checking voltage input terminal and self-checking current input terminal are connected with the line selection device body electricity respectively, self-checking voltage current output terminal passes through the cable and is connected with self-checking voltage input terminal, the line selection device body is equipped with zero sequence current transformer outward, self-checking voltage current output terminal passes through zero sequence current transformer through the cable cross-core, zero sequence current transformer passes through the cable and is connected with self-checking current input terminal.
Furthermore, the line selection device body is externally connected with a 220V alternating current self-checking power supply through a self-checking power supply input terminal.
Furthermore, the self-checking voltage and current output terminal outputs self-checking voltage and self-checking current, the self-checking voltage is directly connected to the self-checking voltage input terminal through a cable, and the self-checking current passes through the zero sequence current transformer through the cable.
A zero sequence current polarity detection method of a line selection device comprises the following steps: when the polarity self-checking is carried out, the line selection device body collects the amplitude and the phase of the self-checking voltage and the self-checking current of the self-checking voltage input terminal and the self-checking current input terminal, compares the phase difference of the self-checking voltage and the self-checking current, and has correct wiring if the phase difference is 0 degrees or more and wrong wiring if the phase difference is 180 degrees or more.
An automatic correction method of a line selection device comprises the following steps: and during polarity correction, all the line correction marks are defaulted to be 0, exclusive or operation is carried out on the correction marks of all the lines with wrong wiring and 1 to obtain new correction marks, the new correction marks are memorized, and then correction angles are added to all the wrong line phases for correction, so that polarity detection and automatic correction of the zero sequence current transformer are realized.
Further, the increasing correction angle is the correction flag multiplied by 180.
Compared with the prior art, the invention has the following advantages:
the invention has simple structure, convenient method, easy operation and high efficiency; the invention does not need manual on-site line adjustment, reduces the manual consumption, saves the time, avoids the influence caused by power failure correction when the wrong line is connected, and has important significance for ensuring safe and reliable operation.
Drawings
Fig. 1 is a schematic diagram of the wiring principle of the line selection device of the present invention.
Detailed Description
The technical solutions of the present invention will be described clearly and completely with reference to the accompanying drawings, and it should be understood that the described embodiments are some, but not all embodiments of the present invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience of description and simplicity of description, but do not indicate or imply that the device or element being referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.
In the description of the present invention, it should be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral connection; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.
Example 1
As shown in fig. 1, the invention provides a line selection device and a zero sequence current polarity detection and automatic correction method thereof, wherein a line selection device body 1 is externally connected with an alternating current 220V to a self-test power input terminal 2, and then a self-test voltage and a self-test current are output from a self-test voltage and current output terminal 3. The self-checking voltage is directly connected to the self-checking voltage input terminal 4 through a cable 7, the self-checking current penetrates through the zero sequence current transformer 6 through the cable 7, and meanwhile, the zero sequence current transformer 6 is connected to the self-checking current input terminal 5 through the cable 7.
When polarity self-checking is carried out, the line selection device body 1 collects the amplitude and the phase of the self-checking voltage and the self-checking current of the self-checking voltage input terminal 4 and the self-checking current input terminal 5, the phase difference of the self-checking voltage and the self-checking current is compared, if the phase difference is close to 0 degree, wiring is correct, and if the phase difference is close to 180 degrees, wiring is wrong.
When the polarity is corrected, all the lines with wiring errors are corrected, and because the phase difference is 180 degrees when the wiring is reversed, the correction is performed by increasing 180 degrees. In order to be suitable for the condition of multiple correction, all the line correction marks are defaulted to be 0 during polarity correction, the correction marks of all the lines with wrong wiring are subjected to XOR operation with 1 to obtain new correction marks, the new correction marks are memorized, then all the phases of the wrong lines are corrected by increasing correction angles (correction marks x 180), and correction results are memorized, so that polarity detection and automatic correction of the zero sequence current transformer 6 are realized, the labor consumption is reduced, the time is saved, and meanwhile, the influence caused by power failure correction when the wrong lines are connected is avoided.
The present invention is illustrated by way of example and not by way of limitation. It will be apparent to those skilled in the art that other variations and modifications may be made in the foregoing disclosure without departing from the spirit or essential characteristics of all embodiments, and that all changes and modifications apparent from the above teachings are within the scope of the invention.
Claims (6)
1. The utility model provides a line selection device, its characterized in that, includes the line selection device body, be equipped with self-checking power input terminal, self-checking voltage current output terminal, self-checking voltage input terminal and self-checking current input terminal on the line selection device body, self-checking power input terminal, self-checking voltage current output terminal, self-checking voltage input terminal and self-checking current input terminal are connected with the line selection device body electricity respectively, self-checking voltage current output terminal passes through the cable and is connected with self-checking voltage input terminal, the line selection device body is equipped with zero sequence current transformer outward, self-checking voltage current output terminal passes through zero sequence current transformer through the cable cross-core, zero sequence current transformer passes through the cable and is connected with self-checking current input terminal.
2. The line selection device of claim 1, wherein the line selection device body is externally connected with a 220V alternating current self-test power supply through a self-test power supply input terminal.
3. The line selection device according to claim 1, wherein the self-test voltage and current output terminal outputs a self-test voltage and a self-test current, the self-test voltage is directly connected to the self-test voltage input terminal through a cable, and the self-test current passes through the zero-sequence current transformer through the cable.
4. A zero sequence current polarity detection method of a line selection device is characterized by comprising the following steps: when the polarity self-checking is carried out, the line selection device body collects the amplitude and the phase of the self-checking voltage and the self-checking current of the self-checking voltage input terminal and the self-checking current input terminal, compares the phase difference of the self-checking voltage and the self-checking current, and has correct wiring if the phase difference is 0 degrees or more and wrong wiring if the phase difference is 180 degrees or more.
5. An automatic correction method of a line selection device is characterized in that the automatic correction method comprises the following steps: and during polarity correction, all the line correction marks are defaulted to be 0, exclusive or operation is carried out on the correction marks of all the lines with wrong wiring and 1 to obtain new correction marks, the new correction marks are memorized, and then correction angles are added to all the wrong line phases for correction, so that polarity detection and automatic correction of the zero sequence current transformer are realized.
6. The automatic correction method of a thread selecting device as claimed in claim 5, wherein the increased correction angle is the correction flag multiplied by 180.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911027128.6A CN111077477A (en) | 2019-10-27 | 2019-10-27 | Line selection device and zero sequence current polarity detection and automatic correction method thereof |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911027128.6A CN111077477A (en) | 2019-10-27 | 2019-10-27 | Line selection device and zero sequence current polarity detection and automatic correction method thereof |
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| CN111077477A true CN111077477A (en) | 2020-04-28 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201911027128.6A Pending CN111077477A (en) | 2019-10-27 | 2019-10-27 | Line selection device and zero sequence current polarity detection and automatic correction method thereof |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115441706A (en) * | 2022-09-26 | 2022-12-06 | 上海铼钠克数控科技有限公司 | PWM generation method and circuit, control method of driver, motor and system |
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| CN106872859A (en) * | 2017-04-26 | 2017-06-20 | 山东钢铁集团日照有限公司 | A kind of small current earthing wire-selecting method |
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2019
- 2019-10-27 CN CN201911027128.6A patent/CN111077477A/en active Pending
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| CN103278790A (en) * | 2012-11-29 | 2013-09-04 | 杭州凯达电力建设有限公司 | Fast testing instrument of variable ratio and polarity of current transformer and testing method thereof |
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| CN104515934A (en) * | 2014-12-22 | 2015-04-15 | 安徽凯川电力保护设备有限公司 | HHT (Hilbert-Huang transform)-based microcomputer small-current earth-fault line selection device |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115441706A (en) * | 2022-09-26 | 2022-12-06 | 上海铼钠克数控科技有限公司 | PWM generation method and circuit, control method of driver, motor and system |
| CN115441706B (en) * | 2022-09-26 | 2024-05-31 | 上海铼钠克数控科技有限公司 | PWM generation method and circuit, driver control method, motor and system |
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