CN113866628A - Switch state analysis method based on current and voltage two-phase sequence comparison - Google Patents
Switch state analysis method based on current and voltage two-phase sequence comparison Download PDFInfo
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Abstract
The invention provides a switch state analysis method based on current and voltage two-phase sequence comparison, which comprises the following steps that 1) current and voltage on upper and lower side lines of a switch subjected to two-phase sequence comparison are detected by a current and voltmeter to carry out harmonic analysis; 2) respectively taking five points in each period on the obtained fundamental wave current diagram and fundamental wave voltage diagram according to a formula of a periodic signal and a formula of fundamental wave sinusoidal current and fundamental wave sinusoidal voltage; 3) connecting five points in each period on the fundamental wave current diagram and the fundamental wave voltage diagram, and changing the current and voltage harmonic diagrams into current and voltage triangular waves; 4) a fixed direct current component is coupled on the triangular wave pattern, and the points, which are identical to the time sequence at the crossing value of the current and the voltage, of the direct current component are points on corresponding lines at the upper end and the lower end of the same switch. The power supply states of the upper side and the lower side of the switch are determined by comparing the current phase sequence and the voltage phase sequence, so that the method is simple and feasible, the phenomenon of circuit burnout is effectively reduced, and the cost consumption is reduced.
Description
Technical Field
The invention relates to the technical field of transformer switches, in particular to a switch state analysis method based on current and voltage two-phase sequence comparison.
Background
The requirement on the power utilization reliability is relatively improved, the uninterrupted and reliable distribution live working is ensured, the important guarantee for promoting the stable development of various careers in China is provided, the importance of the distribution live working is highlighted at the moment, and the improvement of the power supply reliability is an especially important difficult task. When live working is carried out, one section of power supply needs to be disconnected, and because a user also supplies power, a load (a generator or other power supplies) can be added at one end of the disconnected power supply, the upper end and the lower end of a switch between the generator and the load need to be ensured to be consistent, and the switch of the live working external power supply is synchronous.
Disclosure of Invention
In order to solve the technical problems in the background art, the invention provides a switch state analysis method based on current and voltage two-phase sequence comparison, the power states of the upper side and the lower side of a switch are determined through the current and voltage two-phase sequence comparison, the method is simple and feasible, the occurrence of circuit burnout is effectively reduced, and the cost consumption is reduced.
In order to achieve the purpose, the invention adopts the following technical scheme:
a switch switching state analysis method based on current and voltage two-phase sequence comparison comprises the following steps:
1) detecting the current and the voltage on the upper side line and the lower side line of the switch subjected to the two-phase sequence comparison by using a current meter and a voltmeter, and performing harmonic analysis;
2) respectively taking five points in each period on the obtained fundamental wave current diagram and fundamental wave voltage diagram according to a formula of a periodic signal and a formula of fundamental wave sinusoidal current and fundamental wave sinusoidal voltage;
3) connecting five points in each period on the fundamental wave current diagram and the fundamental wave voltage diagram, and changing the current and voltage harmonic diagrams into current and voltage triangular waves;
4) a fixed direct current component is coupled on the triangular wave pattern, and the points, which are identical to the time sequence at the crossing value of the current and the voltage, of the direct current component are points on corresponding lines at the upper end and the lower end of the same switch.
Further, the harmonic analysis of step 1) specifically includes:
setting: harmonic current three phases at the upper end of the switch are respectively IA、IB、ICThe harmonic voltage three phases at the upper end of the switch are respectively UA、UB、UCThe harmonic current three phases at the lower end of the switch are respectively Ia、Ib、IcThe harmonic voltage three phases at the lower end of the switch are respectively Ua、Ub、Uc，；
One periodic current is decomposed by fourier transform into a linear superposition of a direct current component I0 and sinusoidal currents of different frequencies:
m is the Fourier frequency, and omega is the angular frequency; three-phase harmonic current at the upper end of the switch and three-phase harmonic current at the lower end of the switch are converted by the formula;
likewise, a periodic voltage is decomposed by fourier transform into a linear superposition of a dc component U0 and sinusoidal voltages of different frequencies:
m is Fourier frequency, omega is angular frequency, and three-phase harmonic voltage at the upper end of the switch and three-phase harmonic voltage at the lower end of the switch are transformed by the formula.
Further, the five points in step 2) are respectively:
the fundamental current diagram is (0, 0), (pi/2, I)1)，(0，π)，(3π/2，-I1),(2π，0)；
The fundamental voltage is (0, 0), (pi/2, U)1)，(0，π)，(3π/2，-U1),(2π，0)。
Further, the coupling of a fixed dc component on the triangular wave pattern in step 4) is specifically:
in the obtained current triangular wave image, I is taken as I1Each of (/ 2 and I ═ I)12, counting the intersection points of the current triangular wave image and the two straight lines;
in the obtained voltage triangular wave image, taking U as U1Each of/2 and U ═ U1The method comprises the following steps of/2, counting intersection points of two straight lines and a voltage triangular wave image;
three-phase current I at upper end of switchA、IB、ICAnd harmonic current three phases at the lower end of the switch are respectively Ia、Ib、IcComparing the obtained intersection points, wherein the intersection points which are completely the same are points on corresponding lines at two ends of the same switch;
three-phase voltage U at upper end of switchA、UB、UCAnd harmonic voltage three phases at the lower end of the switch are respectively Ua、Ub、UcAnd comparing the obtained intersection points, wherein the intersection points which are completely the same are points on corresponding lines at two ends of the same switch.
Compared with the prior art, the invention has the beneficial effects that:
1) the invention determines the power supply states of the upper side and the lower side of the switch through the comparison of the current phase sequence and the voltage phase sequence, and is simple and effective;
2) the circuit burning phenomenon is effectively reduced, the cost consumption is reduced, meanwhile, the fire disaster is reduced, and the safety of people's life and property is ensured.
Drawings
FIG. 1 is a flow chart of a switch switching state analysis method based on current and voltage two-phase sequence comparison according to the present invention;
fig. 2 is a line graph of harmonic, triangular, fixed dc components of voltage/current in accordance with an embodiment of the present invention.
In the figure: 1-fundamental current/fundamental voltage curve 2-five points 3-direct current component 4-current, voltage triangle wave 5-intersection value are taken in each period of the harmonic curve graph.
Detailed Description
The following detailed description of the present invention will be made with reference to the accompanying drawings.
As shown in fig. 1-2, a switch switching state analysis method based on current and voltage two-phase sequence comparison includes the following steps:
1) detecting the current and the voltage on the upper side line and the lower side line of the switch subjected to the two-phase sequence comparison by using a current meter and a voltmeter, and performing harmonic analysis 1;
2) taking five points 2 in each period on a fundamental current/fundamental voltage curve 1 of the obtained fundamental current diagram and fundamental voltage diagram respectively according to a formula of a periodic signal and a formula of fundamental sinusoidal current and fundamental sinusoidal voltage;
3) five points 2 in each period on the connection fundamental wave current diagram and the fundamental wave voltage diagram change the current and voltage harmonic diagram into a current and voltage triangular wave 4;
4) a fixed dc component 3 is coupled in the triangular wave 4 pattern,
5) and (3) judging: the point on the corresponding line of the upper end and the lower end of the same switch is the point with the same time sequence of the direct current component 3 and the current and voltage crossing value 5.
The specific implementation process of the method is as follows:
the harmonic analysis of the step 1) is specifically as follows:
setting: harmonic current three phases at the upper end of the switch are respectively IA、IB、ICThe harmonic voltage three phases at the upper end of the switch are respectively UA、UB、UCHarmonic current of switch lower endEach phase is Ia、Ib、IcThe harmonic voltage three phases at the lower end of the switch are respectively Ua、Ub、Uc，；
One periodic current is decomposed by fourier transform into a linear superposition of a direct current component I0 and sinusoidal currents of different frequencies:
m is the Fourier frequency, omega is the angular frequency, t is the time; three-phase harmonic current at the upper end of the switch and three-phase harmonic current at the lower end of the switch are converted by the formula;
likewise, a periodic voltage is decomposed by fourier transform into a linear superposition of a dc component U0 and sinusoidal voltages of different frequencies:
m is Fourier frequency, omega is angular frequency, t is time, and three-phase harmonic voltage at the upper end of the switch and three-phase harmonic voltage at the lower end of the switch are transformed by the formula.
The step 2) is specifically as follows:
by the formula of the periodic signal, we can know that the formula of the fundamental wave sinusoidal current is I ═ I1sin(ωt+φ1) According to this formula, we take five points 2 on the obtained fundamental current diagram, which are:
the fundamental current diagram is (0, 0), (pi/2, I)1)，(0，π)，(3π/2，-I1),(2π，0)。
The formula of fundamental wave sinusoidal voltage is U ═ U1sin(ωt+φ1) From this equation, we take five points 2 on the resulting harmonic voltage plot, which are:
the fundamental voltage is (0, 0), (pi/2, U)1)，(0，π)，(3π/2，-U1),(2π，0)。
In the embodiment of fig. 2, the sampling positions of the fundamental current and fundamental voltage curves 1 are the same.
The step 3) is specifically as follows:
referring to fig. 2, five points 2 in each period on a fundamental current diagram and a fundamental voltage diagram are connected, and the current and voltage harmonic diagrams form a triangular wave 4 of current and voltage.
The step 4) of coupling a fixed direct current component 3 on the triangular wave pattern specifically includes:
in the obtained current triangular wave 4 image, I is taken as I ═ I1Each of (/ 2 and I ═ I)12, counting the intersection points of the current triangular wave image and the two straight lines;
in the obtained voltage triangular wave 4 image, U is taken to be U ═ U1Each of/2 and U ═ U1The method comprises the following steps of/2, counting intersection points of two straight lines and a voltage triangular wave image;
in the embodiment of fig. 2, the positions of two straight lines of the direct current component 3 in the triangular wave 4 graph of the current and the voltage are the same.
Step 5), judging:
the voltages of all the measured points in the experiment are subjected to the operation, the obtained intersection points (5 at the intersection value) are compared, and the intersection points which are completely the same are the points on the two end lines of the same switch.
Three-phase current I at upper end of switchA、IB、ICAnd harmonic current three phases at the lower end of the switch are respectively Ia、Ib、IcComparing the obtained intersection points (5 at the intersection value), wherein the intersection points which are completely the same are the points on the corresponding lines at the two ends of the same switch;
three-phase voltage U at upper end of switchA、UB、UCAnd harmonic voltage three phases at the lower end of the switch are respectively Ua、Ub、UcThe obtained intersection points (5 at the intersection value) are compared, and the intersection points which are completely the same are the points on the corresponding lines at the two ends of the same switch.
Comprehensive analysis
By combining the analysis of current and voltage, the pattern of points on the two end lines of the same switch is only the pattern in which the intersection points of the voltage and the current are all identical. The switch switching state analysis method based on current and voltage two-phase sequence comparison effectively reduces the occurrence of line burnout, reduces the cost consumption, reduces the occurrence of fire simultaneously, and ensures the safety of people's life and property.
The above embodiments are implemented on the premise of the technical solution of the present invention, and detailed embodiments and specific operation procedures are given, but the scope of the present invention is not limited to the above embodiments. The methods used in the above examples are conventional methods unless otherwise specified.
Claims (4)
1. A switch state analysis method based on current and voltage two-phase sequence comparison is characterized by comprising the following steps:
1) detecting the current and the voltage on the upper side line and the lower side line of the switch subjected to the two-phase sequence comparison by using a current meter and a voltmeter, and performing harmonic analysis;
2) respectively taking five points in each period on the obtained fundamental wave current diagram and fundamental wave voltage diagram according to a formula of a periodic signal and a formula of fundamental wave sinusoidal current and fundamental wave sinusoidal voltage;
3) connecting five points in each period on the fundamental wave current diagram and the fundamental wave voltage diagram, and changing the current and voltage harmonic diagrams into current and voltage triangular waves;
4) a fixed direct current component is coupled on the triangular wave pattern, and the points, which are identical to the time sequence at the crossing value of the current and the voltage, of the direct current component are points on corresponding lines at the upper end and the lower end of the same switch.
2. The method according to claim 1, wherein the harmonic analysis in step 1) is specifically:
setting: harmonic current three phases at the upper end of the switch are respectively IA、IB、ICThe harmonic voltage three phases at the upper end of the switch are respectively UA、UB、UCThe harmonic current three phases at the lower end of the switch are respectively Ia、Ib、IcThe harmonic voltage three phases at the lower end of the switch are respectively Ua、Ub、Uc，；
One periodic current is decomposed by fourier transform into a linear superposition of a direct current component I0 and sinusoidal currents of different frequencies:
m is the Fourier frequency, and omega is the angular frequency; three-phase harmonic current at the upper end of the switch and three-phase harmonic current at the lower end of the switch are converted by the formula;
likewise, a periodic voltage is decomposed by fourier transform into a linear superposition of a dc component U0 and sinusoidal voltages of different frequencies:
m is Fourier frequency, omega is angular frequency, and three-phase harmonic voltage at the upper end of the switch and three-phase harmonic voltage at the lower end of the switch are transformed by the formula.
3. The method according to claim 1, wherein the five points in step 2) are respectively:
the fundamental current diagram is (0, 0), (pi/2, I)1)，(0，π)，(3π/2，-I1),(2π，0)；
The fundamental voltage is (0, 0), (pi/2, U)1)，(0，π)，(3π/2，-U1),(2π，0)。
4. The method according to claim 1, wherein the step 4) of coupling a fixed dc component to the triangular waveform pattern specifically comprises:
in the obtained current triangular wave image, I is taken as I1Each of (/ 2 and I ═ I)12, counting the intersection points of the current triangular wave image and the two straight lines;
in the obtained voltage triangular wave image, taking U as U1Each of/2 and U ═ U1And 2, counting the intersection points of the voltage triangular wave image and the two straight lines.
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| CN112285608A (en) * | 2020-11-20 | 2021-01-29 | 西安热工研究院有限公司 | High-frequency power supply full-bridge inverter circuit open-circuit fault method |
| CN113267685A (en) * | 2021-07-05 | 2021-08-17 | 珠海格力电器股份有限公司 | Phase sequence detection device and method and electrical equipment |
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2021
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Patent Citations (11)
| Publication number | Priority date | Publication date | Assignee | Title |
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| JPH0298675A (en) * | 1988-10-05 | 1990-04-11 | Kawasoo Tekuseru Kk | Phase checker |
| JPH03206974A (en) * | 1990-01-10 | 1991-09-10 | Tokyo Electric Power Co Inc:The | Method and apparatus for phase discrimination |
| US5298853A (en) * | 1992-12-18 | 1994-03-29 | Lubos Ryba | Electrical apparatus for detecting relationships in three phase AC networks |
| CN102361446A (en) * | 2011-10-27 | 2012-02-22 | 上海贝岭股份有限公司 | Triangular wave oscillating circuit |
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