CN103149460A - Climate correcting method of synthetic electric field of direct current transmission line - Google Patents
Climate correcting method of synthetic electric field of direct current transmission line Download PDFInfo
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- CN103149460A CN103149460A CN2013100237173A CN201310023717A CN103149460A CN 103149460 A CN103149460 A CN 103149460A CN 2013100237173 A CN2013100237173 A CN 2013100237173A CN 201310023717 A CN201310023717 A CN 201310023717A CN 103149460 A CN103149460 A CN 103149460A
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Abstract
The invention relates to a correction method, in particular to a climate correcting method of a synthetic electric field of a direct current transmission line. A synthetic electric field measuring instrument used in the method comprises an electric field measuring probe and a data collection unit which are connected through a cable. The method comprises the following steps that A data of the synthetic electric field are collected; B the collected data of the synthetic electric field are restored into synthetic electric field intensity values; C the synthetic electric field intensity values are monitored; and D modification values of the synthetic electric field intensity values along humidity changes are obtained through statistic analysis. The climate correcting method is used for correcting the synthetic electric field according to different environment humidity on the basis of a classical theory calculation method of the synthetic electric field, enables an empirical formula to be accurate and wide in applicable scope, and guarantees environmentally friendly of the direct current transmission line.
Description
Technical field
The present invention relates to a kind of modification method, be specifically related to a kind of weather modification method of DC power transmission line total electric field.
Background technology
During the DC power transmission line operation, can produce corona discharge, the electric field that produces on ground is called total electric field, comprises two parts: the space Ion Flow Field that direct current nominal electric field and corona discharge produce.When total electric field surpassed certain level, the people under polar conductor may occur as uncomfortable phenomenons such as docking ground object discharges, and shielding bad equipment may run well.Therefore, the respective country standard limits the total electric field that DC power transmission line produces.
Direct current nominal electric field is relevant with the conduction form with wire institute's making alive, is not subjected to such environmental effects.The space Ion Flow Field is produced by corona discharge, is subject to such environmental effects, and particularly humidity, wind etc. are serious on the impact of space Ion Flow Field.The impact of research environment factor on total electric field helps definite different regions to build the design proposal of DC line, guarantees the environment friendly of DC line.
Summary of the invention
For the deficiencies in the prior art, the invention provides a kind of weather modification method of DC power transmission line total electric field, the method is by measuring for a long time mass data on the DC power transmission line test line segment, total electric field field intensity value to the different humidity condition is carried out statistical study, thereby draws the modified value of total electric field under different humidity.
The objective of the invention is to adopt following technical proposals to realize:
A kind of weather modification method of DC power transmission line total electric field, its improvements be, the total electric field measuring instrument that method is used comprises: electric field measurement probe and data acquisition unit; The electric field measurement probe is connected by cable with described data acquisition unit;
Described method comprises the steps:
A, the total electric field data are gathered;
B, the total electric field data that gather are reduced to total electric field field intensity value;
C, described total electric field field intensity value is monitored;
D, statistical study draw the modified value that described total electric field field intensity value changes with humidity.
Preferably, in described steps A, the electric field measurement probe signal is introduced the hyperchannel small signal system, and (the hyperchannel small signal measurement system is a multichannel multimeter, is connected with computer, each drive test is tried data storing in computer, the corresponding total electric field measuring instrument in each road) in; Described small signal system gathers automatically to total electric field data (the total electric field data are exactly that the synthetic electromagnetism measurement apparatus of diverse location measures to get the total electric field value).
Preferably, in described step B, described small signal system is reduced to total electric field field intensity value according to the coefficient of having revised with total electric field digital simulation electric signal by the total electric field digital simulation electric signal that the image data collecting unit transmits.It is voltage signal that the total electric field measuring instrument measures signal, by revising coefficient, it is reduced to field intensity signal.What adopt during calibration is linear fit, i.e. E=a*V+b, and wherein E is field intensity, V is voltage, a, b is for revising coefficient.
Preferably, in described step C, adopt the DC experiment line segment under the varying environment factor, DC power transmission line total electric field field intensity value to be monitored.
More preferably, described environmental factor comprises ambient humidity; The described monitoring time that total electric field field intensity value under the varying environment factor is monitored was greater than 1 year, and ambient humidity is between 20% ~ 95%;
In observation process to ambient humidity and total electric field field intensity value synchro measure.
More preferably, described DC power transmission line total electric field field intensity value comprises positive wire side total electric field field intensity value and cathode conductor side total electric field field intensity value.
Preferably, in described step D, adopt described electric field measurement probe, measure simultaneously positive wire side total electric field field intensity value and cathode conductor side total electric field field intensity value, statistical study draws the modified value that positive wire side total electric field field intensity value and cathode conductor side total electric field field intensity value change with ambient humidity.
More preferably, ambient humidity is divided into four humidity sections; Described four humidity sections comprise 20%-40%, 40%-60%, more than 60%-80% and 80%.
More preferably, it is characterized in that, described modified value comprises that positive wire side total electric field field intensity value increases with modified value and the cathode conductor side total electric field field intensity value that ambient humidity increases the modified value that reduces with ambient humidity.
Compared with the prior art, the beneficial effect that reaches of the present invention is:
1, the weather modification method of DC power transmission line total electric field provided by the invention, adopt the method for true type test determine under varying environment humidity on total electric field affect rule and modified value, have very high similarity with actual DC transmission line of electricity situation.
2, the weather modification method of DC power transmission line total electric field provided by the invention, by on total electric field classical theory computing method bases, revise for varying environment humidity, make this theoretical calculation method more accurately, the scope of application is wider, guarantees the environment friendly of DC power transmission line.
Description of drawings
Fig. 1 is that ground provided by the invention total electric field measurement point is arranged schematic diagram;
Fig. 2 is the distribution schematic diagram of total electric field under varying environment humidity provided by the invention.
Fig. 3 is the process flow diagram of the weather modification method of DC power transmission line total electric field provided by the invention.
Embodiment
Below in conjunction with accompanying drawing, the specific embodiment of the present invention is described in further detail.
As shown in Figure 3, Fig. 3 is the process flow diagram of the weather modification method of DC power transmission line total electric field provided by the invention, and the total electric field measuring instrument that the method is used comprises: electric field measurement probe and data acquisition unit; Described electric field measurement probe is connected by cable with described data acquisition unit; Directly read the numerical value of tested DC electric field by data acquisition unit, also measuring sonde signal leading hyperchannel small signal measurement system can be gathered automatically to the total electric field data in addition;
The method comprises the steps:
A, the total electric field data are gathered: the present invention introduces the hyperchannel small signal system with the electric field measurement probe signal, and (the hyperchannel small signal measurement system is a multichannel multimeter, be connected with computer, each drive test is tried data storing in computer, the corresponding total electric field measuring instrument in each road) in; Described small signal system gathers automatically to total electric field data (the total electric field data are exactly that the synthetic electromagnetism measurement apparatus of diverse location measures to get the total electric field value).
B, the total electric field data that gather are reduced to total electric field field intensity value: small signal system is reduced to total electric field field intensity value according to the coefficient of having revised with total electric field digital simulation electric signal by the total electric field digital simulation electric signal that the image data collecting unit transmits.It is voltage signal that the total electric field measuring instrument measures signal, by revising coefficient, it is reduced to field intensity signal.What adopt during calibration is linear fit, i.e. E=a*V+b, and wherein E is field intensity, V is voltage, a, b is for revising coefficient.
C, described total electric field field intensity value is monitored: adopt DC experiment line segment DC power transmission line total electric field field intensity value is monitored under the varying environment factor.Environmental factor comprises ambient humidity; The monitoring time that total electric field field intensity value under the varying environment factor is monitored was greater than 1 year, and ambient humidity is encompassed between 20% ~ 95%;
To ambient humidity and total electric field field intensity value synchro measure, the measurement result that draws is convenient to analyze the correlativity of total electric field field intensity value and ambient humidity in observation process.
DC power transmission line total electric field field intensity value comprises positive wire side total electric field field intensity value and cathode conductor side total electric field field intensity value.
D, statistical study draw the modified value that described total electric field field intensity value changes with humidity:
Because the discharge of both positive and negative polarity conductor corona there are differences, find in pre-stage test that both positive and negative polarity side of wire was total electric field is different with the Changing Pattern of humidity.Adopt a plurality of probes in test, measure simultaneously positive and negative electrode side of wire was total electric field, the test point location drawing as shown in Figure 1, the DC power transmission line test line segment always is about 1080m, is divided into Drainage Section and test section two parts.Test section is divided into 3 grades (initial anchor tower is first grade to door type tower 1, and door type tower 1 is second gear to door type tower 2, and door type tower 2 is third gear to finishing anchor tower), always is about 820m.The test gear is in the middle of test section, and long 300m has portal in test section both sides.
Employing electric field measurement probe, measure simultaneously positive wire side total electric field field intensity value and cathode conductor side total electric field field intensity value, statistical study draws the modified value that positive wire side total electric field field intensity value and cathode conductor side total electric field field intensity value change with ambient humidity.
Ambient humidity is divided into four humidity sections, comprises: 20%-40%, 40%-60%, more than 60%-80% and 80%.
Modified value comprises that positive wire side total electric field field intensity value increases with modified value and the cathode conductor side total electric field field intensity value that ambient humidity increases the modified value that reduces with ambient humidity.In ambient humidity 60%-80% scope, both positive and negative polarity side of wire was total electric field field intensity value level is basically identical, and with classical theory computing method result of calculation coincide better, the every minimizing 20% of humidity on this basis, side of the positive electrode ground total electric field field intensity value peak value reduces approximately 10% ~ 30%, and negative side ground total electric field field intensity value peak value increases 5% ~ 20%; Ambient humidity is increased to more than 80%, and anodal ground total electric field field intensity value peak value increases approximately 10%, and negative pole ground total electric field field intensity value reduces approximately 10%, that is: the humidity modified value on classical total electric field field intensity value theoretical calculation method basis.
Under varying environment humidity the distribution schematic diagram of total electric field as shown in Figure 2, the side of the positive electrode total electric field field intensity value of DC power transmission line increases with ambient humidity, negative side total electric field field intensity value reduces with the increase of ambient humidity.
The classical theory computing method are namely: based on the ground total electric field computing method of Deutcsh hypothesis, the space charge that produces after the discharge of the method hypothesis conductor corona only affects the amplitude of electric field intensity, not affecting its direction, is to generally believe at present to calculate total electric field analytic method comparatively accurately.
The weather modification method of total electric field provided by the invention is by on total electric field classical theory computing method bases, revise for varying environment humidity, make this theoretical calculation method more accurately, the scope of application is wider, guarantees the environment friendly of DC power transmission line; Adopt the method for actual true type test determine under varying environment humidity on total electric field affect rule and modified value, have very high similarity with actual DC transmission line of electricity situation.
Should be noted that at last: above embodiment is only in order to illustrate that technical scheme of the present invention is not intended to limit, although with reference to above-described embodiment, the present invention is had been described in detail, those of ordinary skill in the field are to be understood that: still can modify or be equal to replacement the specific embodiment of the present invention, and do not break away from any modification of spirit and scope of the invention or be equal to replacement, it all should be encompassed in the middle of claim scope of the present invention.
Claims (9)
1. the weather modification method of a DC power transmission line total electric field, is characterized in that, the total electric field measuring instrument that described method is used comprises: electric field measurement probe and data acquisition unit; Described electric field measurement probe is connected by cable with described data acquisition unit;
Described method comprises the steps:
A, the total electric field data are gathered;
B, the total electric field data that gather are reduced to total electric field field intensity value;
C, described total electric field field intensity value is monitored;
D, statistical study draw the modified value that described total electric field field intensity value changes with humidity.
2. weather modification method as claimed in claim 1, is characterized in that, in described steps A, the electric field measurement probe signal introduced in the hyperchannel small signal system; Described small signal system gathers automatically to the total electric field data.
3. weather modification method as claimed in claim 1, it is characterized in that, in described step B, described small signal system is reduced to total electric field field intensity value according to the coefficient of having revised with total electric field digital simulation electric signal by the total electric field digital simulation electric signal that the image data collecting unit transmits.
4. weather modification method as claimed in claim 1, is characterized in that, in described step C, adopts the DC experiment line segment under the varying environment factor, DC power transmission line total electric field field intensity value to be monitored.
5. weather modification method as claimed in claim 4, is characterized in that, described environmental factor comprises ambient humidity; The described monitoring time that total electric field field intensity value under the varying environment factor is monitored was greater than 1 year, and ambient humidity is between 20% ~ 95%;
In observation process to ambient humidity and total electric field field intensity value synchro measure.
6. weather modification method as claimed in claim 4, is characterized in that, described DC power transmission line total electric field field intensity value comprises positive wire side total electric field field intensity value and cathode conductor side total electric field field intensity value.
7. weather modification method as claimed in claim 1, it is characterized in that, in described step D, adopt described electric field measurement probe, measure simultaneously positive wire side total electric field field intensity value and cathode conductor side total electric field field intensity value, statistical study draws the modified value that positive wire side total electric field field intensity value and cathode conductor side total electric field field intensity value change with ambient humidity.
8. weather modification method as claimed in claim 7, is characterized in that, ambient humidity is divided into four humidity sections; Described four humidity sections comprise 20%-40%, 40%-60%, more than 60%-80% and 80%.
9. weather modification method as claimed in claim 7, it is characterized in that, described modified value comprises that positive wire side total electric field field intensity value increases with modified value and the cathode conductor side total electric field field intensity value that ambient humidity increases the modified value that reduces with ambient humidity.
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Cited By (3)
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| CN106872794A (en) * | 2017-01-09 | 2017-06-20 | 佳禾智能科技股份有限公司 | The signal strength test system and method for testing of a kind of radio communication product |
| CN112540241A (en) * | 2020-11-30 | 2021-03-23 | 重庆电子工程职业学院 | Non-linear compensation system and method for electric field intensity measurement |
| CN114137468A (en) * | 2021-10-21 | 2022-03-04 | 国网浙江省电力有限公司电力科学研究院 | Method and system for correcting field intensity measured by direct current electric field intensity detector |
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Cited By (3)
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| CN106872794A (en) * | 2017-01-09 | 2017-06-20 | 佳禾智能科技股份有限公司 | The signal strength test system and method for testing of a kind of radio communication product |
| CN112540241A (en) * | 2020-11-30 | 2021-03-23 | 重庆电子工程职业学院 | Non-linear compensation system and method for electric field intensity measurement |
| CN114137468A (en) * | 2021-10-21 | 2022-03-04 | 国网浙江省电力有限公司电力科学研究院 | Method and system for correcting field intensity measured by direct current electric field intensity detector |
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