CN109298231B - Current detection method and device for resonance capacitor of arc suppression coil - Google Patents
Current detection method and device for resonance capacitor of arc suppression coil Download PDFInfo
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- CN109298231B CN109298231B CN201811230963.5A CN201811230963A CN109298231B CN 109298231 B CN109298231 B CN 109298231B CN 201811230963 A CN201811230963 A CN 201811230963A CN 109298231 B CN109298231 B CN 109298231B
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- 230000001629 suppression Effects 0.000 title claims abstract description 125
- 239000003990 capacitor Substances 0.000 title claims abstract description 70
- 238000001514 detection method Methods 0.000 title claims abstract description 18
- 238000006073 displacement reaction Methods 0.000 claims abstract description 43
- 238000000034 method Methods 0.000 claims abstract description 18
- 238000004590 computer program Methods 0.000 claims description 6
- 238000004364 calculation method Methods 0.000 abstract description 14
- 230000008033 biological extinction Effects 0.000 description 3
- 238000005259 measurement Methods 0.000 description 2
- 238000007796 conventional method Methods 0.000 description 1
- 230000007423 decrease Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000010891 electric arc Methods 0.000 description 1
- 230000001939 inductive effect Effects 0.000 description 1
- 230000007935 neutral effect Effects 0.000 description 1
- 238000009774 resonance method Methods 0.000 description 1
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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
- G01R19/25—Arrangements for measuring currents or voltages or for indicating presence or sign thereof using digital measurement techniques
Abstract
The invention provides a current detection method and a current detection device for a resonance capacitor of an arc suppression coil, wherein the judgment method comprises the following steps: detecting the displacement voltage of the arc suppression coil at each gear, determining the gear corresponding to the maximum displacement voltage, and setting the gear as n gear; detecting the current of the arc suppression coil when the arc suppression coil is in the n-1 gear and the current of the arc suppression coil when the arc suppression coil is in the n +1 gear; and calculating the current of the resonant capacitor, judging whether the current is between the current of the arc suppression coil when the arc suppression coil is in the n-1 gear and the current of the arc suppression coil when the arc suppression coil is in the n +1 gear, and if the current is not in the n-1 gear, shifting again to calculate the current of the resonant capacitor. According to the technical scheme provided by the invention, after the current of the resonant capacitor is calculated, whether the current is in the value range determined according to the displacement voltage of each gear is verified, so that the accuracy of the calculation result is judged, and the reliability of the detection result is improved.
Description
Technical Field
The invention belongs to the technical field of current measurement of resonant capacitors, and particularly relates to a current detection method and device of a resonant capacitor of an arc suppression coil.
Background
In recent years, the proportion of cable lines in a power grid is higher and higher, and the current of the ground capacitance of the power distribution network is greatly increased. In order to automatically extinguish the grounding electric arc generated when the single-phase grounding fault of the power grid occurs, the conventional power distribution network mostly adopts a mode that a neutral point is grounded through an arc suppression coil to extinguish the arc. The working principle of the arc suppression coil is as follows: when a single-phase grounding fault occurs, the arc suppression coil and the ground capacitance of the power distribution network form a parallel resonance loop, the ground capacitance of the power distribution network is used as the resonance capacitance in the resonance loop, so that the inductive current and the current of the ground capacitance of the power distribution network are mutually offset, the current of a fault point is reduced, the grounding arc is guaranteed to be reliably self-extinguished, the reliability of the operation of the power distribution network is improved, and the continuity of power supply is guaranteed.
At present, when arc extinction is performed by adopting a mode of grounding an arc extinction coil, as shown in fig. 1, an adjustable arc extinction coil Lx and a resonant capacitor Cx are connected in series to form a resonant circuit. However, with the increase of the proportion of the cable lines, the asymmetry degree of the power grid further decreases, and particularly in the initial operation stage of a transformer substation, because the load is small, the displacement voltage is often below 10V, so that the measurement accuracy of the conventional method for measuring the capacitance current is reduced.
Although the current of the resonant capacitor can be calculated by a two-point method, a resonance method and the like in the prior art, the accuracy of a calculation result cannot be verified, and the problem of poor reliability of the calculation result of the current of the resonant capacitor is caused.
Disclosure of Invention
The invention aims to provide a current detection method of an arc suppression coil resonant capacitor, which is used for solving the problem that the reliability of a calculation result is poor because the calculation result of the resonant capacitor current cannot be verified in the prior art; correspondingly, the invention also provides a current detection device of the resonance capacitance of the arc suppression coil, which is used for solving the problem of poor reliability of a calculation result caused by the fact that the calculation result of the resonance capacitance current cannot be verified in the prior art.
In order to achieve the purpose, the technical scheme provided by the invention is as follows:
a current detection method of a resonance capacitor of an arc suppression coil comprises the following steps:
detecting the displacement voltage of the arc suppression coil at each gear, determining the gear corresponding to the maximum displacement voltage, and setting the gear as n gear;
detecting the current of the arc suppression coil when the arc suppression coil is in the n-1 gear and the current of the arc suppression coil when the arc suppression coil is in the n +1 gear;
and calculating the current of the resonant capacitor, judging whether the current is between the current of the arc suppression coil when the arc suppression coil is in the n-1 gear and the current of the arc suppression coil when the arc suppression coil is in the n +1 gear, and if the current is not in the n-1 gear, shifting again to calculate the current of the resonant capacitor.
According to the technical scheme provided by the invention, after the current of the resonant capacitor is calculated, whether the current is in the value range determined according to the displacement voltage of each gear is verified, so that the accuracy of the calculation result is judged, and the reliability of the detection result is improved.
Further, the step of calculating the current of the resonant capacitor comprises the following steps:
and calculating the current of the resonance capacitor according to the displacement voltage when the arc suppression coil is in two continuous gears which are larger than the n gear or the displacement voltage when the arc suppression coil is in two continuous gears which are smaller than the n gear.
The current of the resonance capacitor is calculated by adopting a two-point method, the calculation process is simpler, and the calculation result is more accurate.
Further, it is assumed that the displacement voltage when the arc suppression coil is in two consecutive gears larger than n-gear or the displacement voltage when the arc suppression coil is in two consecutive gears smaller than n-gear is U respectively1And U2Then, the current of the resonant capacitor is:
I＝(U1*I1+U2*I2)/(U1+U2)。
further, if the displacement voltage does not reach the maximum value when the arc suppression coil falls to the lowest gear or rises to the highest gear, the current of the resonance capacitor is judged to exceed the compensation range of the arc suppression coil.
When the displacement voltage of the arc suppression coil is reduced to the lowest gear or is increased to the highest gear and does not reach the maximum value, the current of the resonance capacitor can be known to exceed the compensation range of the arc suppression coil, and the accuracy of the detection of the resonance capacitor of the arc suppression coil can be further improved by adding the judging step.
A current accuracy judging device of a resonance capacitor of an arc suppression coil comprises a processor and a memory, wherein a computer program for executing on the processor is stored in the memory; the processor, when executing the computer program, performs the steps of:
detecting the displacement voltage of the arc suppression coil at each gear, determining the gear corresponding to the maximum displacement voltage, and setting the gear as n gear;
detecting the current of the arc suppression coil when the arc suppression coil is in the n-1 gear and the current of the arc suppression coil when the arc suppression coil is in the n +1 gear;
and calculating the current of the resonant capacitor, judging whether the current is between the current of the arc suppression coil when the arc suppression coil is in the n-1 gear and the current of the arc suppression coil when the arc suppression coil is in the n +1 gear, and if the current is not in the n-1 gear, shifting again to calculate the current of the resonant capacitor.
According to the technical scheme provided by the invention, after the current of the resonant capacitor is calculated, whether the current is in the value range determined according to the displacement voltage of each gear is verified, so that the accuracy of the calculation result is judged, and the reliability of the detection result is improved.
Further, the step of calculating the current of the resonant capacitor comprises the following steps:
and calculating the current of the resonance capacitor according to the displacement voltage when the arc suppression coil is in two continuous gears which are larger than the n gear or the displacement voltage when the arc suppression coil is in two continuous gears which are smaller than the n gear.
The current of the resonance capacitor is calculated by adopting a two-point method, the calculation process is simpler, and the calculation result is more accurate.
Further, it is assumed that the displacement voltage when the arc suppression coil is in two consecutive gears larger than n-gear or the displacement voltage when the arc suppression coil is in two consecutive gears smaller than n-gear is U respectively1And U2Then, the current of the resonant capacitor is:
I＝(U1*I1+U2*I2)/(U1+U2)。
further, if the displacement voltage does not reach the maximum value when the arc suppression coil falls to the lowest gear or rises to the highest gear, the current of the resonance capacitor is judged to exceed the compensation range of the arc suppression coil.
When the displacement voltage of the arc suppression coil is reduced to the lowest gear or is increased to the highest gear and does not reach the maximum value, the current of the resonance capacitor can be known to exceed the compensation range of the arc suppression coil, and the accuracy of the detection of the resonance capacitor of the arc suppression coil can be further improved by adding the judging step.
Drawings
FIG. 1 is a prior art resonant circuit for an arc suppression coil;
fig. 2 is a diagram of the relationship between the shift position of the arc suppression coil and the displacement voltage in the embodiment of the method.
Detailed Description
The technical solution of the present invention will be further explained with reference to the specific embodiments.
The method comprises the following steps:
the embodiment provides a current detection method for a resonance capacitor of an arc suppression coil, which is used for detecting a current value of the resonance capacitor in an arc suppression coil mode and judging the accuracy of a detection result so as to improve the reliability of the detection result of the current of the resonance capacitor.
The method for detecting the current of the resonance capacitor of the arc suppression coil provided by the embodiment comprises the following steps:
detecting the displacement voltage of the arc suppression coil at each gear, determining the gear corresponding to the maximum displacement voltage, and setting the gear as n;
detecting the current of the arc suppression coil when the arc suppression coil is in the n-1 gear and the current of the arc suppression coil when the arc suppression coil is in the n +1 gear;
calculating the current of the resonance capacitor, and judging whether the current is between the current of the arc suppression coil when the arc suppression coil is in the n-1 gear and the current of the arc suppression coil when the arc suppression coil is in the n +1 gear;
if so, the current of the resonance capacitor is accurate, otherwise, the current of the resonance capacitor is judged to be inaccurate;
and if the calculated resonant capacitance is inaccurate, the current of the resonant capacitance is calculated by shifting again.
In this embodiment, a two-stage method is used to calculate the current of the resonant capacitor, specifically:
adjusting the shift of the arc suppression coil, detecting the displacement voltage of the arc suppression coil at each shift, and finding out the resonance point according to the change rule of the displacement voltage, as shown in fig. 2, when the shift voltage reaches the maximum, the shift of the arc suppression coil is n, and the maximum value of the displacement voltage in fig. 2 is U0，U3The displacement voltage is the displacement voltage when the arc suppression coil is in a gear position larger than n gear;
and selecting two continuous gears within the range of being larger than n gears or being smaller than n gears, and calculating the current of the resonance capacitor according to the displacement voltage of the arc suppression coil when the arc suppression coil is positioned in the two gears.
The current of the resonant capacitor is set as ICIn this embodiment, for example, the two selected gears are smaller than the n gear, and the displacement voltages of the arc suppression coil at the two gears are respectively U1And U2Then, the current of the resonant capacitor is calculated according to the following formula:
IC＝(U1*I1+U2*I2)/(U1+U2)。
the method for judging the accuracy of the resonant capacitor current based on the arc suppression coil provided by the embodiment is used for judging the current I of the resonant capacitorCThe method for judging the accuracy comprises the following steps:
setting the gear position of the arc suppression coil at the maximum displacement voltage as n, and setting the current of the arc suppression coil inductor as I when the arc suppression coil is at the n-1 gearn-1When the arc suppression coil is in n +1 gear, the current of the arc suppression coil inductor is In+1And then:
current I when resonant capacitorCAt a current In-1And In+1In between, the current I of the resonant capacitor is judgedCThe accuracy is high;
current I when resonant capacitorCOut of current In-1And In+1In between, the current I of the resonant capacitor is judgedCInaccurate, need the gear shift calculation again.
In the process of testing the displacement voltage, if the displacement voltage does not reach the maximum value when the arc suppression coil is lowered to the lowest gear or is raised to the highest gear, the current of the resonance capacitor is judged to exceed the compensation range of the arc suppression coil.
The embodiment of the device is as follows:
the present embodiment provides a device for determining the current accuracy of a resonance capacitor of a crowbar coil, which includes a processor and a memory, wherein the memory stores a computer program for execution on the processor, and when the processor executes the computer program, the method for determining the current accuracy of the resonance capacitor of the crowbar coil in the above method embodiments is implemented.
Claims (8)
1. A current detection method of a resonance capacitor of an arc suppression coil is characterized by comprising the following steps:
detecting the displacement voltage of the arc suppression coil at each gear, determining the gear corresponding to the maximum displacement voltage, and setting the gear as n gear;
detecting the current of the arc suppression coil when the arc suppression coil is in the n-1 gear and the current of the arc suppression coil when the arc suppression coil is in the n +1 gear;
and calculating the current of the resonant capacitor, judging whether the current is between the current of the arc suppression coil when the arc suppression coil is in the n-1 gear and the current of the arc suppression coil when the arc suppression coil is in the n +1 gear, and if the current is not in the n-1 gear, shifting again to calculate the current of the resonant capacitor.
2. The method for detecting a current of a resonance capacitor of an arc suppression coil according to claim 1, wherein the step of calculating the current of the resonance capacitor comprises the steps of:
and calculating the current of the resonance capacitor according to the displacement voltage when the arc suppression coil is in two continuous gears which are larger than the n gear or the displacement voltage when the arc suppression coil is in two continuous gears which are smaller than the n gear.
3. The method of claim 2, wherein the shift voltage of the arc suppression coil in two consecutive gears higher than n-th gear or the shift voltage of the arc suppression coil in two consecutive gears lower than n-th gear is set to be U respectively1And U2Arc suppression coil is arranged inThe current of the arc suppression coil when the two continuous gears are larger than the n gear or the current of the arc suppression coil when the arc suppression coil is in the two continuous gears which are smaller than the n gear are I respectively1And I2Then, the current of the resonant capacitor is:
I＝(U1*I1+U2*I2)/(U1+U2)。
4. the method as claimed in claim 1, wherein if the shift voltage does not reach the maximum value when the arc suppression coil falls to the lowest stage or rises to the highest stage, it is determined that the current of the resonance capacitor exceeds the compensation range of the arc suppression coil.
5. A current detection device of a resonance capacitor of an arc suppression coil comprises a processor and a memory, wherein the memory is stored with a computer program executed on the processor; wherein the processor executes the computer program to perform the steps of:
detecting the displacement voltage of the arc suppression coil at each gear, determining the gear corresponding to the maximum displacement voltage, and setting the gear as n gear;
detecting the current of the arc suppression coil when the arc suppression coil is in the n-1 gear and the current of the arc suppression coil when the arc suppression coil is in the n +1 gear;
and calculating the current of the resonant capacitor, judging whether the current is between the current of the arc suppression coil when the arc suppression coil is in the n-1 gear and the current of the arc suppression coil when the arc suppression coil is in the n +1 gear, and if the current is not in the n-1 gear, shifting again to calculate the current of the resonant capacitor.
6. The apparatus of claim 5, wherein the step of calculating the current of the resonance capacitor comprises the steps of:
and calculating the current of the resonance capacitor according to the displacement voltage when the arc suppression coil is in two continuous gears which are larger than the n gear or the displacement voltage when the arc suppression coil is in two continuous gears which are smaller than the n gear.
7. The apparatus as claimed in claim 6, wherein the shift voltage of the arc suppression coil in two consecutive gears higher than n-th gear or the shift voltage of the arc suppression coil in two consecutive gears lower than n-th gear is set to be U1And U2When the arc suppression coil is in two continuous gears which are larger than n gears, the current of the arc suppression coil or when the arc suppression coil is in two continuous gears which are smaller than n gears is I1And I2Then, the current of the resonant capacitor is:
I＝(U1*I1+U2*I2)/(U1+U2)。
8. the apparatus as claimed in claim 5, wherein if the shift voltage does not reach the maximum value when the arc suppression coil falls to the lowest stage or rises to the highest stage, it is determined that the current of the resonance capacitor exceeds the compensation range of the arc suppression coil.
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