CN113933608A - Power frequency electric field measurement system and working method - Google Patents
Power frequency electric field measurement system and working method Download PDFInfo
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- CN113933608A CN113933608A CN202111342385.6A CN202111342385A CN113933608A CN 113933608 A CN113933608 A CN 113933608A CN 202111342385 A CN202111342385 A CN 202111342385A CN 113933608 A CN113933608 A CN 113933608A
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- 238000005259 measurement Methods 0.000 title claims abstract description 36
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- 238000007781 pre-processing Methods 0.000 claims abstract description 14
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- 239000003990 capacitor Substances 0.000 claims description 3
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R29/00—Arrangements for measuring or indicating electric quantities not covered by groups G01R19/00 - G01R27/00
- G01R29/12—Measuring electrostatic fields or voltage-potential
- G01R29/14—Measuring field distribution
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R15/00—Details of measuring arrangements of the types provided for in groups G01R17/00 - G01R29/00, G01R33/00 - G01R33/26 or G01R35/00
- G01R15/14—Adaptations providing voltage or current isolation, e.g. for high-voltage or high-current networks
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B5/00—Near-field transmission systems, e.g. inductive or capacitive transmission systems
- H04B5/40—Near-field transmission systems, e.g. inductive or capacitive transmission systems characterised by components specially adapted for near-field transmission
- H04B5/48—Transceivers
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Abstract
The invention provides a power frequency electric field measuring system and a working method, comprising the following steps: the device comprises an electric field measuring sensor, a signal preprocessing module, a microprocessor and a wireless communication module; the electric field measuring sensor is connected with the signal preprocessing module, the signal processing module is connected with the microprocessor, and the microprocessor is connected with the wireless communication module; the electric field measurement sensor adopts a three-dimensional sensor which comprises three pairs of electrode plates, wherein a pair of electrode plates are respectively arranged in the three directions of XYZ, and the electric field intensity in each direction corresponds to the potential difference between the electrode plates in the corresponding direction; the small-size measuring equipment provided by the invention is matched with Bluetooth wireless transmission, so that the measuring equipment is represented as an isolated point, the interference on an original electric field is small during measurement, a plurality of measuring points are synchronously sampled, and the three-dimensional electric field sensor is combined, so that the side amount of a three-dimensional space electric field is realized, and the three-dimensional electric field sensor can be effectively used for deducing the overhead structure and the voltage grade of a three-phase electric wire.
Description
Technical Field
The invention relates to the technical field of electric field intensity measurement, in particular to a power frequency electric field measurement system and a working method.
Background
The statements in this section merely provide background information related to the present disclosure and may not constitute prior art.
The electric field measurement of the high-voltage transmission line has very important significance for the running safety of the transmission line and the safety of various devices and objects close to the transmission line. An electric field exceeding a certain intensity may cause corona, which is harmful to equipment facilities around it, and when a moving object (e.g., an operation maintenance vehicle, a crane for construction) approaches a high-voltage line, the safety of the distance can be evaluated from the detected field intensity, and therefore, it has practical significance to detect the field intensity around the power supply line.
In the power industry today, the electric field in the space of a facility can be specifically measured, which is of particular use in its design, manufacture and operation, such as in the modification and monitoring of the insulation structure of high voltage equipment. Also, as the voltage levels increase, not only does the electric field distribution around the associated power equipment become more complex, but it also causes electromagnetic compatibility problems.
The inventor finds that the power frequency electric field is low in frequency and greatly influenced by an external conductor, and the superposition of three-phase electricity also has close influence on the electric field, so that the existing power frequency electric field is low in measurement accuracy.
Disclosure of Invention
In order to solve the defects of the prior art, the invention provides a power frequency electric field measuring system and a working method thereof, wherein a small-volume measuring device is matched with Bluetooth wireless transmission, so that the measuring device is represented as an isolated point, the interference on the original electric field is small during measurement, a plurality of measuring points are synchronously sampled, and a three-dimensional electric field sensor is combined to realize the lateral quantity of a three-dimensional space electric field and effectively deduce the overhead structure and the voltage grade of a three-phase electric wire.
In order to achieve the purpose, the invention adopts the following technical scheme:
the first aspect of the present invention provides a power frequency electric field measurement system, including:
the device comprises an electric field measuring sensor, a signal preprocessing module, a microprocessor and a wireless communication module;
the electric field measuring sensor is connected with the signal preprocessing module, the signal processing module is connected with the microprocessor, and the microprocessor is connected with the wireless communication module;
the electric field measurement sensor adopts a three-dimensional sensor which comprises three pairs of electrode plates, wherein a pair of electrode plates are respectively arranged in the three directions of XYZ, and the electric field intensity in each direction corresponds to the potential difference between the electrode plates in the corresponding direction.
Further, the signal preprocessing module adopts a processor of a CA3140 model.
Further, the microprocessor employs a processor model STC8 A8K.
Further, the wireless communication module is a bluetooth module.
Furthermore, the wireless communication device also comprises a power supply module which supplies power for the signal processing module, the microprocessor and the wireless communication module.
Further, the three-dimensional sensor includes a pair of electrode plates parallel to the X-axis, a pair of electrode plates parallel to the Y-axis, and a pair of electrode plates parallel to the Z-axis.
Furthermore, the correspondence between the electric field strength in each direction and the potential difference in the corresponding direction is as follows:
wherein a is the distance between the two polar plates in the X direction.
The second aspect of the invention provides a working method of a power frequency electric field measurement system, which comprises the following steps:
carrying out multi-point electric field measurement by using a plurality of three-dimensional sensors, and sending the measured potential difference data corresponding to the field intensity data in each direction to a signal preprocessing module for data preprocessing;
and sending the preprocessed data to the microprocessor module for processing and then sending the processed data to the external terminal through the wireless communication module.
Further, if the distance between the two plates in each direction is the same, a regular hexahedron sensor is formed, and the self-capacitance C of the regular hexahedron sensor1Comprises the following steps:
C1＝0.0689aε2。
mutual capacitance C of regular hexahedron sensor2Comprises the following steps:
C2＝1.773aε2。
further, the relation between the measurement voltage and the electric field of the three-dimensional sensor is as follows:
wherein, C1、C2Respectively self-capacitance and mutual capacitance, Ri and Ci are equivalent resistance and capacitance of the measuring capacitor, UiZIs the induced voltage in the Z direction.
Compared with the prior art, the invention has the beneficial effects that:
according to the power frequency electric field measuring system and the working method, the small-size measuring equipment is matched with Bluetooth wireless transmission, so that the measuring equipment is represented as an isolated point, the interference on an original electric field is small during measurement, a plurality of measuring points are synchronously sampled, and the three-dimensional electric field sensor is combined, so that the side amount of a three-dimensional space electric field is realized, and the overhead structure and the voltage grade of a three-phase electric wire can be effectively deduced.
Drawings
The accompanying drawings, which are incorporated in and constitute a part of this specification, are included to provide a further understanding of the invention, and are incorporated in and constitute a part of this specification, illustrate exemplary embodiments of the invention and together with the description, serve to explain the invention and not to limit the invention.
Fig. 1 is a schematic connection diagram of a power frequency electric field measurement system provided in embodiment 1 of the present invention.
Fig. 2 is a schematic view of a three-dimensional sensor provided in embodiment 1 of the present invention.
Fig. 3 is a schematic view of voltage measurement of a three-dimensional sensor according to embodiment 2 of the present invention.
Detailed Description
The invention is further described with reference to the following figures and examples.
It is to be understood that the following detailed description is exemplary and is intended to provide further explanation of the invention as claimed. Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs.
It is noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of exemplary embodiments according to the invention. As used herein, the singular is intended to include the plural unless the context clearly dictates otherwise, and it should be further understood that the terms "comprises" and/or "comprising," when used in this specification, specify the presence of features, steps, operations, elements, components, and/or combinations thereof.
The embodiments and features of the embodiments of the present invention may be combined with each other without conflict.
Example 1:
as described in the background art, the electric field measurement of a high-voltage power transmission line is very important for the safety of the operation of the power transmission line itself and the safety of various devices and objects adjacent to the power transmission line, and an electric field exceeding a certain intensity may cause corona and may be harmful to the devices and facilities around the power transmission line.
As shown in fig. 1, the present embodiment provides a power frequency electric field measurement system, which includes an electric field measurement sensor, a signal processing module (CA3140), a power module (a charging management system), an STC8A8K single chip microcomputer (i.e., a microprocessor), and a bluetooth module.
The principle of the alternating electric field sensor is to convert an alternating electric field signal into a voltage current signal which is easy to measure by utilizing the law of electromagnetic induction. Then, the high-resistance operational amplifier is used for amplifying and filtering as preliminary processing, and the voltage signals filtered and amplified by the operational amplifier are transmitted to the singlechip for AD conversion so that the singlechip performs comprehensive processing on the data again. Then the single chip microcomputer controls an output circuit. The electric field value to be measured is transmitted to the Bluetooth module, is sent out through the Bluetooth module, is received and processed by the collector, and can be received and displayed through the mobile phone Bluetooth. The multi-point acquisition signals are synchronously carried out so as to calculate the phase difference of each point at the moment, thereby deducing the distribution of the three-phase electric field, and the added synchronous sampling trigger circuit is realized by infrared light control signals.
The three-dimensional sensor includes a pair of electrode plates parallel to the X-axis, a pair of electrode plates parallel to the Y-axis, and a pair of electrode plates parallel to the Z-axis, as shown in fig. 2.
Furthermore, the correspondence between the electric field strength in each direction and the potential difference in the corresponding direction is as follows:
wherein a is the distance between the two polar plates in the X direction.
Example 2:
the embodiment 2 of the invention provides a working method of a power frequency electric field measurement system, which utilizes the power frequency electric field measurement system of the embodiment 1 and comprises the following processes:
carrying out multi-point electric field measurement by using a plurality of three-dimensional sensors, and sending the measured potential difference data corresponding to the field intensity data in each direction to a signal preprocessing module for data preprocessing;
and sending the preprocessed data to the microprocessor module for processing and then sending the processed data to the external terminal through the wireless communication module.
Further, if the distance between the two plates in each direction is the same, a regular hexahedron sensor is formed, and the self-capacitance C of the regular hexahedron sensor1Comprises the following steps:
C1＝0.0689aε2。
mutual capacitance C of regular hexahedron sensor2Comprises the following steps:
C2＝1.773aε2。
as shown in fig. 3, the relationship between the measurement voltage and the electric field of the three-dimensional sensor is:
wherein, C1、C2Respectively self-capacitance and mutual capacitance, Ri and Ci are equivalent resistance and capacitance of the measuring capacitor, UiZIs induced voltage in Z direction, a, epsilon0，ε2，Ri，C1，C2Are all constants,. epsilon0Is the air dielectric constant.
Example 3:
in this embodiment, an observation matrix M is set, where M is GP-1Wherein, P is an N-dimensional potential coefficient matrix and is determined according to the distance between the power transmission lines; g is an N-dimensional row vector and is determined according to the coordinates of the space measuring points and the distance between the power transmission lines.
And (4) aiming at minimizing the condition number of the observation matrix, optimizing by adopting a particle swarm algorithm to obtain the optimal position of the three-dimensional sensor.
The inertial weight of the mth iteration of the particle swarm algorithm is as follows:
wherein, ω isFirst stageAnd ωFinal (a Chinese character of 'gan')Initial and final values of the inertial weight, mGeneral assemblyM is the current iteration number.
The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (10)
1. A power frequency electric field measurement system is characterized in that:
the method comprises the following steps:
the device comprises an electric field measuring sensor, a signal preprocessing module, a microprocessor and a wireless communication module;
the electric field measuring sensor is connected with the signal preprocessing module, the signal processing module is connected with the microprocessor, and the microprocessor is connected with the wireless communication module;
the electric field measurement sensor adopts a three-dimensional sensor which comprises three pairs of electrode plates, wherein a pair of electrode plates are respectively arranged in the three directions of XYZ, and the electric field intensity in each direction corresponds to the potential difference between the electrode plates in the corresponding direction.
2. The power frequency electric field measurement system of claim 1, wherein:
the signal preprocessing module adopts a processor of a CA3140 model.
3. The power frequency electric field measurement system of claim 1, wherein:
the microprocessor uses a processor model STC8 A8K.
4. The power frequency electric field measurement system of claim 1, wherein:
the wireless communication module is a Bluetooth module.
5. The power frequency electric field measurement system of claim 1, wherein:
the wireless communication device further comprises a power supply module, wherein the power supply module supplies power to the signal processing module, the microprocessor and the wireless communication module.
6. The power frequency electric field measurement system of claim 1, wherein:
the three-dimensional sensor includes a pair of electrode plates parallel to the X-axis, a pair of electrode plates parallel to the Y-axis, and a pair of electrode plates parallel to the Z-axis.
7. The power frequency electric field measurement system of claim 6, wherein:
the corresponding relation between the electric field intensity in each direction and the potential difference in the corresponding direction is as follows:
wherein a is the distance between the two polar plates in the X direction.
8. A working method of a power frequency electric field measurement system is characterized in that: use of the power frequency electric field measurement system of any one of claims 1 to 7, comprising the process of:
carrying out multi-point electric field measurement by using a plurality of three-dimensional sensors, and sending the measured potential difference data corresponding to the field intensity data in each direction to a signal preprocessing module for data preprocessing;
and sending the preprocessed data to the microprocessor module for processing and then sending the processed data to the external terminal through the wireless communication module.
9. The method of operation of claim 8, wherein:
if the distance between the two plates in each direction is the same,then a regular hexahedron sensor is formed, and the self-capacitance C of the regular hexahedron sensor1Comprises the following steps:
C1＝0.0689aε2。
mutual capacitance C of regular hexahedron sensor2Comprises the following steps:
C2＝1.773aε2。
10. the method of operation of claim 8, wherein:
the relation between the measurement voltage and the electric field of the three-dimensional sensor is as follows:
wherein, C1、C2Respectively self-capacitance and mutual capacitance, Ri and Ci are equivalent resistance and capacitance of the measuring capacitor, UiZIs the induced voltage in the Z direction.
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2021
- 2021-11-12 CN CN202111342385.6A patent/CN113933608A/en active Pending
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