CN113945802B - Method and device for measuring space potential below high-voltage transmission line - Google Patents
Method and device for measuring space potential below high-voltage transmission line Download PDFInfo
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- CN113945802B CN113945802B CN202111238587.6A CN202111238587A CN113945802B CN 113945802 B CN113945802 B CN 113945802B CN 202111238587 A CN202111238587 A CN 202111238587A CN 113945802 B CN113945802 B CN 113945802B
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- 230000005540 biological transmission Effects 0.000 title claims abstract description 69
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- 230000005684 electric field Effects 0.000 claims abstract description 36
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- 230000009466 transformation Effects 0.000 claims description 7
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- 230000035945 sensitivity Effects 0.000 abstract description 5
- 238000005259 measurement Methods 0.000 description 21
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- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 4
- 229910052802 copper Inorganic materials 0.000 description 4
- 239000010949 copper Substances 0.000 description 4
- 238000009413 insulation Methods 0.000 description 4
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- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 2
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- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/08—Locating faults in cables, transmission lines, or networks
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
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- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
Abstract
The invention provides a method and a device for measuring space potential below a high-voltage transmission line, wherein the method comprises the following steps: placing an analog charge under the high-voltage transmission line; measuring and calculating induction voltage generated by the space potential of the analog charge below the power transmission line by using a voltage dividing device; the distortion effect of the simulated charge on the space electric field below the power transmission line is considered, the distortion potential is corrected, and the electric field intensity in the vertical direction of the space below the high-voltage power transmission line is obtained; the relation between the space potential below the power transmission line and the height of the measuring point on the ground is established according to the electric field intensity value in the vertical direction obtained in the step S3, and the device comprises a conductor ball, a supporting structure and a voltage measuring structure. The voltage distortion correction is carried out on the voltage measured by the device by using an analog charge method, the structure of the measuring device is simple, the sensitivity is higher, and the measured data is accurate.
Description
Technical Field
The invention relates to the technical field of high-voltage transmission line induced voltage measurement, in particular to a method and a device for measuring space potential below a high-voltage transmission line.
Background
With the rapid development of national economy and the continuous increase of electricity load, the voltage level of a power grid is continuously increased, the space density of an overhead line is continuously increased, and the overhead line is in close contact with surrounding residents, although the electromagnetic field intensity below the overhead power transmission line is limited by the national environmental protection standard, even if the environmental protection standard is reached, the problem of induction electricity disturbing the residents still exists, so that a certain amount of environmental protection complaints and disputes are caused. Therefore, the measurement of the space induction potential below the overhead line needs to be carried out, and corresponding protective measures are adopted by measuring the induction voltage, so that disputes are avoided. Meanwhile, the induced voltage below the high-voltage transmission line is weak, and the sensitivity of the measuring device is also high.
Disclosure of Invention
The invention aims to at least solve the technical problems that whether safety measures for protecting induced voltage are needed to be adopted below a power transmission line lacks corresponding technical guidance and a measuring device which can measure the induced potential below a high-voltage line regularly and is sensitive enough is not available in the prior art due to the lack of a method for measuring the induced potential below the overhead line.
To this end, the first aspect of the present invention provides a method for measuring a space potential under a high-voltage transmission line.
The invention provides a method for measuring the space potential below a high-voltage transmission line, which comprises the following steps:
s1: placing an analog charge under the high-voltage transmission line;
s2: measuring and calculating induction voltage generated by the space potential of the analog charge below the power transmission line by using a voltage dividing device;
s3: the distortion effect of the simulated charge on the space electric field below the power transmission line is considered, the distortion potential is corrected, and the electric field intensity in the vertical direction of the space below the high-voltage power transmission line is obtained;
s4: and (3) establishing the relation between the space potential below the power transmission line and the height of the belt measuring point from the ground according to the electric field intensity value in the vertical direction obtained in the step (S3).
According to the technical scheme, the method for measuring the space potential below the high-voltage transmission line can be provided with the following additional technical characteristics:
further, in step S1, the analog charge is a spherical shell structure, and the spherical shell structure is made of a good conductor.
Further, the voltage measured after being divided by the voltage divider is
The induced voltage of the analog charge is:
wherein k is the transformation ratio coefficient of the voltage divider.
Further, in step S3, the vertical direction of the near area under the high voltage transmission line is approximately equal to the uniform electric field, the analog charge is divided into n charged rings, n matching points are found on the surface of the analog charge, and the potential equation is written for each matching point k, which has the following relationship:
wherein ,
is the induced voltage under the action of the original electric field; />
The applied voltage of n circular rings of the conductor ball to the matching point k; e (E) 0 The electric field strength of the uniform strong electric field in the vertical direction; h is a k Matching the height of the point from the ground for the column writing equation; τ i To simulate the amount of charge carried by a charged torus, i=1, 2,3,; />
An induced voltage which is the analog charge obtained in the step S2; p is a potential coefficient;
writing the above-mentioned writable potential equation for each point column to obtain the equation set as follows:
wherein Στ=0, and bringing into the equation set yields the electric field strength E of Fang Yunjiang electric field under the power line 0 。
Further, in step S4, the relationship between the space potential below the power transmission line and the height of the measured point from the ground is:
wherein ,ht For the height of the point to be measured from the ground,
to place the original potential at the analog charge.
The second aspect of the invention provides a measuring device for the space potential below a high-voltage transmission line.
The invention provides a measuring device for space potential below a high-voltage transmission line, which is used for the measuring method for space potential below the high-voltage transmission line.
In the technical scheme, the conductor ball is placed in an electric field of a space below a high-voltage transmission line as analog charge, is of a ball shell structure and is made of good conductive materials, copper, iron, aluminum and other materials can be adopted as the conductor ball, the copper ball shell is selected as the conductor ball, the support structure provides a supporting function for the conductor ball, the voltage measurement structure can measure the induced voltage of the conductor ball in the electric field of the space below the high-voltage transmission line, and the voltage measurement structure needs to keep a certain safety distance with the conductor ball.
According to the technical scheme, the measuring device for the space potential below the high-voltage transmission line can be further provided with the following additional technical characteristics:
in the above technical scheme, the voltage measurement structure comprises a voltage dividing device and a voltmeter, wherein the cable is connected with the voltage dividing device, and the voltmeter is connected with the voltage dividing device.
In this technical scheme, cable one end is connected with the conductor ball through the aviation connector, and the other end is connected with bleeder mechanism, and the induced voltage of conductor ball obtains the voltage value of easy measurement through bleeder mechanism, utilizes the voltmeter to survey and gets the voltage value after, according to bleeder mechanism's transformation ratio coefficient, obtains the induced voltage of conductor ball, adopts this kind of measurement mode, realizes more easily to effectively improve measuring device's sensitivity.
In the above technical scheme, the voltage divider comprises a high-resistance voltage divider, the high-resistance voltage divider comprises a first resistor R1, a first capacitor C1, a second resistor R2 and a second capacitor C2, wherein a conductor ball is connected with one end of the first resistor R1, the other end of the first resistor R1 is connected with one end of the second resistor R2, the other end of the second resistor R2 is connected with the ground, the first capacitor C1 is connected in parallel with two ends of the first resistor R1, the second capacitor C2 is connected in parallel with two ends of the second resistor R2, and two ends of the second resistor R2 are connected with a voltmeter in parallel.
In the technical scheme, reliable grounding of the high-resistance voltage divider is realized through connection of the second resistor R2 and the ground, and the resistance values of the first resistor R1 and the second resistor R2 are respectively Z 1 and Z2 The transformation ratio coefficient k of the voltage dividing device is:
in any of the above technical solutions, the supporting structure includes a bracket and a cradle head, the bracket is connected with the cradle head, the conductor ball is disposed on the cradle head, and the cradle head is detachably and insulatively connected with the conductor ball.
In the technical scheme, the bracket is detachably connected with the cradle head, so that the cradle head is convenient to assemble and disassemble, the cradle head and the conductor ball can be detachably connected through the supporting nut, the insulating sheath is wrapped by the supporting nut, insulation between the cradle head and the conductor ball is realized, and the influence of the cradle head and the bracket on simulation charge is eliminated.
In any of the above aspects, the support structure is insulated from the ground.
In this technical scheme, bearing structure can utilize insulating tripod as the support realization and ground insulation, and insulating tripod can select wooden tripod, also can set up insulating cover or insulating pad that satisfies the requirement in the support bottom, when improving the measurement accuracy, guarantees the personal and the equipment safety in the measurement process.
In summary, due to the adoption of the technical scheme, the beneficial effects of the invention are as follows: by using an analog charge method, voltage distortion correction is performed according to the relation between the voltage and the electric field and the voltage measured by the measuring device, the measuring method and the measuring device for reliably measuring the space potential below the high-voltage transmission line are provided, the measuring device has a simple structure, high sensitivity and accurate measured data.
Additional aspects and advantages of the invention will be set forth in part in the description which follows, or may be learned by practice of the invention.
Drawings
The foregoing and/or additional aspects and advantages of the invention will become apparent and may be better understood from the following description of embodiments taken in conjunction with the accompanying drawings in which:
FIG. 1 is a flow chart of a method of measuring a space potential under a high voltage transmission line according to an embodiment of the present invention;
fig. 2 is a schematic structural diagram of a measurement device for space potential under a high-voltage transmission line according to an embodiment of the present invention;
fig. 3 is a schematic diagram of a method for measuring a space potential under a high voltage transmission line according to an embodiment of the present invention.
The correspondence between the reference numerals and the component names in fig. 2 is:
1. a conductor ball; 2. a support structure; 3. a voltage measurement structure; 4. a cable; 5. a voltage dividing device; 6. a voltmeter; 7. a high-resistance voltage divider; 8. a bracket; 9. a cradle head; 10. a support nut; 11. an air joint.
Detailed Description
In order that the above-recited objects, features and advantages of the present invention will be more clearly understood, a more particular description of the invention will be rendered by reference to the appended drawings and appended detailed description. It should be noted that, in the case of no conflict, the embodiments of the present application and the features in the embodiments may be combined with each other.
In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present invention, however, the present invention may be practiced otherwise than as described herein, and therefore the scope of the present invention is not limited to the specific embodiments disclosed below.
A method for measuring a space potential under a high-voltage transmission line according to some embodiments of the present invention is described below with reference to fig. 1 to 3.
Some embodiments of the present application provide a method for measuring a space potential below a high-voltage transmission line.
As shown in fig. 1 to 3, a first embodiment of the present invention provides a method for measuring a space potential below a high-voltage transmission line, which includes the following steps:
s1: placing an analog charge under the high-voltage transmission line;
s2: measuring and calculating induction voltage generated by the space potential of the analog charge below the power transmission line by using a voltage dividing device;
s3: the distortion effect of the simulated charge on the space electric field below the power transmission line is considered, the distortion potential is corrected, and the electric field intensity in the vertical direction of the space below the high-voltage power transmission line is obtained;
s4: and (3) establishing the relation between the space potential below the power transmission line and the height of the belt measuring point from the ground according to the electric field intensity value in the vertical direction obtained in the step (S3).
In the step S1, the analog charge is a spherical shell structure, and the spherical shell structure is made of a good conductor.
The voltage measured after being divided by the voltage divider is
The induced voltage of the analog charge is:
wherein k is the transformation ratio coefficient of the voltage divider.
In step S3, the vertical direction of the near area under the high-voltage power transmission line is approximately equal to the uniform electric field, as shown in fig. 3, the analog charge is divided into n charged rings, n matching points are found on the surface of the analog charge, and the potential equation is written for each matching point k, which has the following relationship:
wherein ,
is the induced voltage under the action of the original electric field; />
The applied voltage of n circular rings of the conductor ball to the matching point k; e (E) 0 The electric field strength of the uniform strong electric field in the vertical direction; h is a k Matching the height of the point from the ground for the column writing equation; τ i To simulate the amount of charge carried by a charged torus, i=1, 2,3,; />
An induced voltage which is the analog charge obtained in the step S2; p is a potential coefficient, and the calculation method of p is as follows:
writing the above-mentioned writable potential equation for each point column to obtain the equation set as follows:
wherein Στ=0, and bringing into the equation set yields the electric field strength E of Fang Yunjiang electric field under the power line 0 。
The system of column writing equations is:
in the above
All are conductor ball measuring voltages +.>
N+1 unknowns in the above equation, n+1 equations can be solved to obtain the electric field intensity E of Fang Yunjiang under the transmission line 0 。
Further, in step S4, the relationship between the space potential below the power transmission line and the height of the measured point from the ground is:
wherein ,ht For the height of the point to be measured from the ground,
to place the original potential at the analog charge.
Some embodiments of the present application provide a measurement device for a space potential below a high-voltage transmission line.
A second embodiment of the present invention proposes a measurement device for a space potential under a high voltage transmission line, and on the basis of the first embodiment, as shown in fig. 1 to 3, the measurement device includes a conductor ball 1, a support structure 2, and a voltage measurement structure 3, wherein the support structure 2 is disposed on the ground, the conductor ball 1 is connected with the support structure 2, and the voltage measurement structure 3 is connected with the conductor ball 1 through a cable 4.
In this embodiment, the conductive ball 1 is placed as an analog charge in the electric field in the space under the high-voltage transmission line, the conductive ball 1 is in a spherical shell structure and is made of a good conductive material, and may be made of copper, iron, aluminum or other materials, preferably, the conductive ball 1 is a copper spherical shell, the supporting structure 2 provides a supporting function for the conductive ball 1, the voltage measuring structure 3 may measure the induced voltage of the conductive ball 1 in the electric field in the space under the high-voltage transmission line, and the voltage measuring structure 3 needs to keep a certain safety distance from the conductive ball 1.
A third embodiment of the present invention proposes a measurement device for a space potential under a high-voltage transmission line, and on the basis of the above embodiments, as shown in fig. 1 to 3, the voltage measurement structure 3 includes a voltage dividing device 5 and a voltmeter 6, the cable 4 is connected with the voltage dividing device 5, and the voltmeter 6 is connected with the voltage dividing device 5.
In this embodiment, one end of the cable 4 is connected with the conductor ball 1 through the aviation connector 11, the other end is connected with the voltage divider 5, the induced voltage of the conductor ball 1 obtains a voltage value which is easier to measure through the voltage divider 5, after the voltage value is measured by the voltmeter 6, the induced voltage of the conductor ball 1 is obtained according to the transformation ratio coefficient of the voltage divider 5, by adopting the measuring mode, the implementation is easier, and the sensitivity of the measuring device is effectively improved.
The fourth embodiment of the present invention provides a measurement device for a space potential below a high-voltage transmission line, and based on the above embodiments, as shown in fig. 1 to 3, the voltage divider 5 includes a high-resistance voltage divider 7, where the high-resistance voltage divider 7 includes a first resistor R1, a first capacitor C1, a second resistor R2, and a second capacitor C2, where the conductor ball 1 is connected to one end of the first resistor R1, the other end of the first resistor R1 is connected to one end of the second resistor R2, the other end of the second resistor R2 is connected to ground, the first capacitor C1 is connected in parallel to two ends of the first resistor R1, the second capacitor C2 is connected in parallel to two ends of the second resistor R2, and two ends of the second resistor R2 are connected in parallel to the voltmeter 6.
In this embodiment, the second resistor R2 is connected to ground to achieve reliable grounding of the high-resistance voltage divider 7, and the resistances of the first resistor R1 and the second resistor R2 are Z1 and Z2 respectively, so that the transformation ratio coefficient k of the voltage divider 5 is:
a fifth embodiment of the present invention proposes a device for measuring a space potential under a high-voltage transmission line, and on the basis of any of the above embodiments, as shown in fig. 1 to 3, the support structure 2 includes a bracket 8 and a cradle head 9, the bracket 8 is connected with the cradle head 9, the conductor ball 1 is disposed on the cradle head 9, and the cradle head 9 is detachably and insulatively connected with the conductor ball 1.
In this embodiment, the bracket 8 is detachably connected with the cradle head 9, so that the cradle head 9 and the conductor ball 1 can be conveniently assembled and disassembled, the cradle head 9 and the conductor ball 1 can be detachably connected through the supporting nut 10, the supporting nut 10 wraps the insulating sheath, insulation between the cradle head 9 and the conductor ball 1 is realized, and the influence of the cradle head 9 and the bracket 8 on simulation charge is eliminated.
A sixth embodiment of the present invention proposes a method for measuring a space potential under a high voltage transmission line, and on the basis of any of the above embodiments, as shown in fig. 1 to 3, the supporting structure 2 is insulated from the ground.
In this embodiment, the support structure 2 may utilize an insulating tripod as the support 8 to achieve insulation from the ground, the insulating tripod may be a wooden tripod, or an insulating sleeve or an insulating pad meeting the requirements may be disposed at the bottom of the support 8, so as to improve the accuracy of measurement and ensure the safety of personnel and equipment in the measurement process.
In the description of the present specification, the terms "one embodiment," "some embodiments," "particular embodiments," and the like, mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the present invention. In this specification, schematic representations of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.
Claims (9)
1. The method for measuring the space potential below the high-voltage transmission line is characterized by comprising the following steps of:
s1: placing an analog charge under the high-voltage transmission line;
s2: measuring and calculating induction voltage generated by the space potential of the analog charge below the power transmission line by using a voltage dividing device;
s3: the distortion effect of the simulated charge on the space electric field below the power transmission line is considered, the distortion potential is corrected, and the electric field intensity in the vertical direction of the space below the high-voltage power transmission line is obtained;
s4: establishing a relation between the space potential below the power transmission line and the height of the belt measuring point from the ground according to the electric field intensity value in the vertical direction obtained in the step S3;
in step S3, the vertical direction of the near area under the high-voltage power transmission line is approximately equal to the uniform electric field, the analog charge is divided into n charged rings, n matching points are found on the surface of the analog charge, and the potential equation can be written for each matching point k, so that the following relationship exists:
wherein ,
is the induced voltage under the action of the original electric field; />
The applied voltage of n circular rings of the conductor ball to the matching point k;
the electric field strength of the uniform strong electric field in the vertical direction; />
Matching the height of the point from the ground for the column writing equation; />
To simulate the charge amount of the charged ring, +.>
；/>
An induced voltage which is the analog charge obtained in the step S2;pis the potential coefficient;
writing the above-mentioned writable potential equation for each point column to obtain the equation set as follows:
wherein ,
the electric field strength of Fang Yunjiang electric field under the transmission line is obtained by taking the equation set>
。
2. The method according to claim 1, wherein in the step S1, the analog charge is in a spherical shell structure, and the spherical shell structure is made of a good conductor.
3. A high voltage transmission line according to claim 1The method for measuring the space potential under the road is characterized in that the voltage measured after being divided by a voltage divider is
The induced voltage of the analog charge is:
wherein k is the transformation ratio coefficient of the voltage divider.
4. The method for measuring the space potential below the high-voltage transmission line according to claim 1, wherein in the step S4, the relation between the space potential below the transmission line and the height of the belt measuring point from the ground is:
wherein ,
for the height of the point to be measured from the ground, +.>
To place the original potential at the analog charge.
5. A measuring device for the space potential under a high voltage transmission line, which is used for the measuring method for the space potential under the high voltage transmission line according to any one of the claims 1 to 4, and is characterized by comprising a conductor ball (1), a supporting structure (2) and a voltage measuring structure (3), wherein the supporting structure (2) is arranged on the ground, the conductor ball (1) is connected with the supporting structure (2), and the voltage measuring structure (3) is connected with the conductor ball (1) through a cable (4).
6. The measuring device for the space potential below the high-voltage transmission line according to claim 5, wherein the voltage measuring structure (3) comprises a voltage dividing device (5) and a voltmeter (6), the cable (4) is connected with the voltage dividing device (5), and the voltmeter (6) is connected with the voltage dividing device (5).
7. The device for measuring the space potential below the high-voltage transmission line according to claim 6, wherein the voltage divider (5) comprises a high-resistance voltage divider (7), the high-resistance voltage divider (7) comprises a first resistor (R1), a first capacitor (C1), a second resistor (R2) and a second capacitor (C2), wherein the conductor ball (1) is connected with one end of the first resistor (R1), the other end of the first resistor (R1) is connected with one end of the second resistor (R2), the other end of the second resistor (R2) is connected with the ground, the first capacitor (C1) is connected in parallel with two ends of the first resistor (R1), the second capacitor (C2) is connected in parallel with two ends of the second resistor (R2), and the two ends of the second resistor (R2) are connected with the voltmeter (6) in parallel.
8. The measuring device of the space potential under the high-voltage transmission line according to any one of claims 6 or 7, characterized in that the supporting structure (2) comprises a bracket (8) and a holder (9), the bracket (8) is connected with the holder (9), the conductor ball (1) is arranged on the holder (9), and the holder (9) is detachably and insulatively connected with the conductor ball (1).
9. A measuring device of the space potential under a high voltage transmission line according to any of the claims 5 to 7, characterized in that the support structure (2) is insulated from ground.
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