CN109142894B - Direct current wire corona space charge distribution testing method based on coupling equipotential principle - Google Patents
Direct current wire corona space charge distribution testing method based on coupling equipotential principle Download PDFInfo
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- G01—MEASURING; TESTING
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- G01R29/00—Arrangements for measuring or indicating electric quantities not covered by groups G01R19/00 - G01R27/00
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Abstract
A test method for DC wire corona space charge distribution based on a coupling equipotential principle comprises a lapping step, a voltage regulating step, a collecting step and a calculating step, wherein after the lapping step is completed, the voltage regulating step and the collecting step are repeated for multiple times in an alternating mode, and finally the calculating step is carried out. The beneficial effects are as follows: the accurate measurement and calculation of the space potential and the synthetic electric field distribution of the DC lead after the corona generation can be realized by adjusting the height of the test lead, and the measurement cost of monitoring the synthetic electric field of the DC transmission line is reduced by the measurement method.
Description
Technical Field
The invention relates to the field of direct current corona electrical parameter measurement, in particular to a method for testing direct current wire corona space charge distribution based on a coupling equipotential principle.
Background
Monitoring of direct current electric field and ion current becomes an important part of evaluation and monitoring of direct current transmission engineering environmental influence. Space charge generated by corona discharge of a direct current transmission line directionally moves in an electric field, and space current generated by the space charge is called ion current and is distributed in the whole field area. The direct current composite electric field is generated by the combined action of a nominal electric field and a space potential, and the electric field generated by space charge is easily influenced by the change of an external environment, so that the composite electric field is difficult to accurately measure.
The existing measuring method only measures a direct current synthetic electric field on the ground, and adopts a rotary voltmeter 1, the rotary voltmeter can only be used for measuring the synthetic field intensity at the ground surface and cannot measure the spatial distribution of the direct current field; 2. in order to ensure the measurement accuracy of the rotary voltmeter in actual measurement, corresponding measures for preventing electric field distortion, such as laying shielding metal plates, are often required; 3. due to the large amount of charged charges in the space, the space potential in the field domain will enter the probe of the rotary voltmeter, and will have certain influence on the measurement result.
Disclosure of Invention
The invention aims to solve the problems and designs a test method of the corona space charge distribution of a direct current lead based on the coupling equipotential principle. The specific design scheme is as follows:
a test method of DC wire corona space charge distribution based on coupling equipotential principle includes lapping step, voltage regulating step, collecting step, calculating step, after lapping step is completed, repeating the voltage regulating step and collecting step for multiple times, calculating step finally,
in the lapping step, a section of measuring lead parallel to the power transmission line is built, one end of the measuring lead is fixed above the bottom surface through an insulating bracket, the other end of the measuring lead is connected with a high-voltage direct current power supply, the high-voltage direct current power supply is grounded through a sampling resistor,
in the voltage regulating step, the output voltage of the high-voltage direct-current power supply is regulated from low to high,
based on the principle of coupling equipotential, when the voltage applied on the coupled thin wire is the space potential of the position of the thin wire, because the space potential of the position of the wire is undistorted at the moment, the thin wire can not adsorb space charge and can not repel the space charge, the ion current value injected by the thin wire is 0 at the moment,
the current I flowing through the sampling resistor is larger than zero, which indicates that space charge is still injected near the test lead, and the applied potential of the test lead is smaller than the space synthesis potential at the moment, and the applied potential of the test lead should be increased; when the applied potential of the test wire is gradually increased to make the voltage at the two ends of the sampling resistor just zero,
the output voltage of the high-voltage direct-current power supply is the space potential at the measuring lead at the moment,
continuing to increase the applied potential of the test conductor, it was found that the current I flowing through the sampling resistor remains at zero value at this time due to the repulsive effect of the test conductor on the surrounding space charge,
in the collecting step, the height of the measuring lead to the ground is adjusted, the voltage adjusting step is repeated to obtain a plurality of groups of space potentials which form space potential distribution,
in the calculating step, the distribution condition of the direct current synthetic electric field is calculated in an interpolation mode according to the space potential distribution obtained in the collecting step.
One pin of the direct current power supply is electrically connected with the measuring lead, the other pin of the direct current power supply is connected with one pin of the sampling resistor, the other pin of the sampling resistor is connected with the ground,
when measuring positive polarity space charge, one pin of the DC power supply is a positive electrode pin,
when measuring the space charge with negative polarity, one pin of the direct current power supply is a negative pole pin.
The measuring lead is a coupling thin lead, the measuring lead is a bare lead,
thin wires are used because the wire radius can be ignored, so that in the measurement of the spatial potential distribution of the overhead line to ground, the potential values on the thin wires are considered to be equal everywhere. If the wire radius is too large, the wire radius cannot be ignored, i.e., the wire is distorted with respect to the spatial potential.
The method for testing the space charge distribution of the direct current conducting wire corona based on the coupling equipotential principle, which is obtained by the technical scheme of the invention, has the beneficial effects that:
the accurate measurement and calculation of the space potential and the synthetic electric field distribution of the DC lead after the corona generation can be realized by adjusting the height of the test lead, and the measurement cost of monitoring the synthetic electric field of the DC transmission line is reduced by the measurement method.
Drawings
FIG. 1 is a schematic view of the structure of the present invention after the lapping step is completed;
FIG. 2 is a diagram showing the distribution of the space potential and the resultant electric field when a single DC conductor with a diameter of 0.4mm is subjected to a high voltage of-30 kV;
FIG. 3 is a diagram showing the distribution of the space potential and the resultant electric field when a single DC conductor with a diameter of 0.4mm is subjected to a high voltage of-40 kV;
in the figure, 1, a measurement lead; 2. an insulating support; 3. sampling a resistor; 4. high voltage direct current power supply.
Detailed Description
The present invention will be described in detail below with reference to the accompanying drawings.
FIG. 1 is a schematic structural diagram of the completed lapping step of the present invention, and as shown in FIG. 1, a method for testing the corona space charge distribution of a DC conductor based on the principle of coupling equipotential includes the lapping step, the voltage regulating step, the collecting step, and the calculating step, after the lapping step is completed, the voltage regulating step and the collecting step are repeated alternately for many times, and finally the calculating step is performed,
in the lapping step, a section of measuring lead 1 parallel to the power transmission line is built, one end of the measuring lead 1 is fixed above the bottom surface through an insulating bracket 2, the other end is connected with a high-voltage direct current power supply 4, the high-voltage direct current power supply 4 is grounded through a sampling resistor 3,
in the voltage regulating step, the output voltage of the high-voltage direct current power supply 4 is regulated from low to high, so that the voltage at two ends of the sampling resistor 3 is just zero, the output voltage of the high-voltage direct current power supply 4 is the space potential at the position of the measuring lead 1,
in the acquisition step, the height of the measuring lead 1 to the ground is adjusted, the voltage regulation step is repeated to obtain a plurality of groups of space potentials which form space potential distribution,
in the calculating step, the distribution condition of the direct current synthetic electric field is calculated in an interpolation mode according to the space potential distribution obtained in the collecting step.
One pin of the direct current power supply is electrically connected with the measuring lead, the other pin of the direct current power supply is connected with one pin of the sampling resistor, the other pin of the sampling resistor is connected with the ground,
when measuring positive polarity space charge, one pin of the DC power supply is a positive electrode pin,
when measuring the space charge with negative polarity, one pin of the direct current power supply is a negative pole pin.
The measuring lead 1 is a coupling thin lead, and the measuring lead 1 is a bare lead.
Example 1
A coupling thin wire parallel to the power transmission line is arranged below the direct current power transmission line and is connected with an external direct current power supply through a wire with an insulating shielding layer;
based on the principle of coupling equipotential, when the voltage applied to the coupled thin wire is the space potential of the position where the thin wire is located, the space potential of the position where the wire is located is undistorted, and the thin wire cannot adsorb space charges and repel the space charges, so that the value of the ion current injected by the thin wire is 0.
The voltage applied to the measuring lead 1 is adjusted to make the current I flowing through the sampling resistor 3 be exactly zero, and the potential of the testing lead is the space potential of the position where the lead is located according to the principle of coupling equipotential.
Thin wires are used because the wire radius can be ignored, so that in the measurement of the spatial potential distribution of the overhead line to ground, the potential values on the thin wires are considered to be equal everywhere. If the wire radius is too large, the wire radius cannot be ignored, i.e., the wire is distorted with respect to the spatial potential.
Taking the corona with positive polarity as an example, if the current I flowing through the sampling resistor 3 is greater than zero, it indicates that there is still space charge injection near the test wire, and the applied potential of the test wire at this time is less than the space synthesis potential, and the applied potential of the test wire should be increased; when the applied potential of the test wire is gradually increased, so that the current I of the sampling resistor 3 is just zero, the potential of the test wire at the moment is the space potential of the position where the wire is located; continuing to increase the applied potential of the test conductor, it was found that the current I through the sampling resistor 3 remained at zero value at this time due to the repulsive effect of the test conductor on the surrounding space charge.
Therefore, the applied potential of the test wire is gradually adjusted from low to high, so that the current I flowing through the sampling resistor 3 is exactly zero, and the applied potential at the moment is the space potential of the position where the test wire is located.
Example 2
FIG. 2 is a diagram showing the distribution of the space potential and the resultant electric field when a single DC conductor with a diameter of 0.4mm is subjected to a high voltage of-30 kV; fig. 3 is a spatial potential and a resultant electric field distribution diagram when a single dc wire with a test diameter of 0.4mm is applied with a high voltage of-40 kV, as shown in fig. 2 and 3, accurate measurement of the spatial potential and the resultant electric field distribution after corona start of the dc wire is realized by adjusting the height of the test wire, and the spatial potential and the electric field distribution of the dc transmission line can be measured without distortion, which has the advantages of high precision, wide test range, simplicity, convenience, and the like.
The technical solutions described above only represent the preferred technical solutions of the present invention, and some possible modifications to some parts of the technical solutions by those skilled in the art all represent the principles of the present invention, and fall within the protection scope of the present invention.
Claims (4)
1. A test method of DC wire corona space charge distribution based on coupling equipotential principle includes lapping step, voltage regulating step, collecting step and calculating step, and is characterized in that after the lapping step is completed, the voltage regulating step and the collecting step are repeated for many times, and finally the calculating step is performed,
in the lapping step, a section of measuring lead parallel to the power transmission line is built, one end of the measuring lead is fixed above the bottom surface through an insulating bracket, the other end of the measuring lead is connected with a high-voltage direct current power supply, the high-voltage direct current power supply is grounded through a sampling resistor,
in the voltage regulating step, the output voltage of the high-voltage direct-current power supply is regulated from low to high based on the coupling equipotential principle, so that the voltage at two ends of the sampling resistor is just zero, the output voltage of the high-voltage direct-current power supply is the space potential at the position of the measuring lead at the moment,
in the collecting step, the height of the measuring lead to the ground is adjusted, the voltage adjusting step is repeated to obtain a plurality of groups of space potentials which form space potential distribution,
in the calculating step, the distribution condition of the direct current synthetic electric field is calculated in an interpolation mode according to the space potential distribution obtained in the collecting step.
2. The method for testing the corona space charge distribution of a DC wire based on the coupled equipotential principle of claim 1, wherein one leg of the DC power supply is electrically connected to the measurement wire, the other leg of the DC power supply is connected to one leg of a sampling resistor, the other leg of the sampling resistor is connected to ground,
when measuring positive polarity space charge, one pin of the DC power supply is a positive electrode pin,
when measuring the space charge with negative polarity, one pin of the direct current power supply is a negative pole pin.
3. The method for testing the corona space charge distribution of a direct current wire based on the coupled equipotential principle of claim 1, wherein the measuring wire is a coupled thin wire.
4. The method for testing the corona space charge distribution of a direct current conducting wire based on the coupling equipotential principle of claim 1, wherein the measuring conducting wire is a bare conducting wire.
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