CN107271760B - Device and method for evaluating underground power frequency voltage bipolar plate - Google Patents
Device and method for evaluating underground power frequency voltage bipolar plate Download PDFInfo
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- CN107271760B CN107271760B CN201710394086.4A CN201710394086A CN107271760B CN 107271760 B CN107271760 B CN 107271760B CN 201710394086 A CN201710394086 A CN 201710394086A CN 107271760 B CN107271760 B CN 107271760B
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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
- G01R19/2503—Arrangements for measuring currents or voltages or for indicating presence or sign thereof using digital measurement techniques for measuring voltage only, e.g. digital volt meters (DVM's)
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Abstract
The invention discloses a device and a method for evaluating a bipolar plate of an underground power frequency voltage.A power frequency voltage generation module has two poles respectively connected to a grounding grid and a copper bar electrode; the grounding grid and the copper bar electrodes are buried in the ground; the bipolar plate voltage acquisition module is buried in the ground and is connected with the input end of the data measurement module through a coaxial cable; the data measurement module is connected with the signal control platform through the wireless communication module; the signal control platform is connected with the graphic processing module; the bipolar plate voltage acquisition module in the device has no requirement on the placement direction, and is convenient to arrange; the data obtained by collecting the voltage in the system is transmitted to the signal control platform by the wireless communication module. The invention also discloses a method for measuring and calculating the earth surface induced voltage gradient by using the device and a power frequency voltage.
Description
Technical Field
The invention relates to the technical field of an evaluation device of a bipolar plate of an underground power frequency voltage.
Background
The transmission tower grounding device plays a role in quickly discharging fault current and lightning current, reducing the potential of the tower and ensuring the safety of nearby equipment and personnel, is an important guarantee for the reliable operation of a power system, and meanwhile, as the ground has certain resistivity, certain potential can appear at the current entrance place and the current flowing place. The ground surface near the lightning inflow site can present a certain potential distribution, if people or animals are exactly near the lightning strike point, the potential difference between the two points acts on the people or the animals due to the fact that the people or the animals stand or walk on the different two points of the ground surface, and casualties can be caused. When a lightning strike or a ground short occurs, serious economic loss and social impact may be caused. Therefore, finding a device and a method capable of rapidly and conveniently detecting the voltage distribution in the ground fault and further taking corresponding protective measures has become a problem to be solved in the operation and maintenance work of the existing transmission line in the power industry.
At present, no effective monitoring method is available for the potential distribution of the earth surface, the earth surface dispersion flow in a certain direction can be measured usually, the potential distribution of the earth surface is inferred according to the earth surface dispersion flow condition, the operation process is complex, the accuracy is low, and the specific implementation process is inconvenient. Aiming at the problems, the invention provides an underground power frequency voltage bipolar plate evaluation device aiming at the underground voltage distribution monitoring, and provides a new method for judging the safety of the periphery of a power transmission line tower.
Disclosure of Invention
the invention aims to provide an underground power frequency voltage bipolar plate evaluation device which can evaluate the underground voltage of a power frequency ground fault, integrates generation, collection and analysis, has a simple structure, is convenient to operate, is safe and reliable, obtains the distribution of the underground voltage of the ground fault through a designed test and analysis method, and can realize the high-efficiency and accurate judgment of the safety of the periphery of a power transmission line tower.
the technical problem of the invention is mainly solved by the following technical scheme:
A signal control platform 210 is electrically connected with a power frequency voltage adjusting module 100 and is in data connection with a data processing module 230 and a wireless communication module 250; the signal control platform 210 sends a control signal to the power frequency voltage regulation module 100 to realize the regulation of the power frequency voltage amplitude and the voltage output time; the output end of the power frequency voltage regulating module 100 is connected with the grounding grid 130 and the copper rod electrode 120 through the conducting wire 110 to form a loop; the probe parts AA of the four sets of voltage measuring units are linearly distributed between the grounding grid and the grounding electrode, and the distance between every two sets is equal to L.
The four sets of bipolar plate voltage acquisition modules are composed of two sets of metal polar plates, the two sets of polar plates are supported by insulating rods in a right angle manner, and each set of polar plates is formed by two square metal polar plates which are supported by the insulating rods and stand oppositely; for each group of polar plates, an insulated wire is welded above each polar plate; the bipolar plate voltage acquisition module is arranged under the ground surface, the plane of the polar plate is vertical to the ground plane, and the arrangement angle of the polar plate is arbitrary.
Further, the signal control platform is communicated with the voltage measuring unit through the wireless communication module, receives voltage data information of the voltage measuring unit and controls the working state of the voltage measuring unit.
Furthermore, the voltage measuring unit comprises a voltage sensing unit and a data storage converter, the voltage sensing unit is connected with the insulated conducting wire on the bipolar plate, and the voltage sensing unit is connected with the data storage converter through a coaxial cable. The power frequency voltage adjusting module can output 50Hz power frequency voltage with adjustable amplitude and on-off time, and forms a loop with the grounding grid, the conducting wire, the copper rod electrode and the ground.
The voltage measuring unit comprises a voltage sensing unit and a data storage converter, the voltage sensing unit is connected with the insulated conducting wire on the bipolar plate, and the voltage sensing unit is connected with the data storage converter through a coaxial cable.
Another object of the present invention is to provide a method for measuring and calculating the power frequency voltage in the ground by using the above device:
According to the method for evaluating the underground power frequency voltage bipolar plate by adopting the device, the landfill depth and landfill distance of the grounding grid 130 and the copper bar electrode 120 are adjusted according to the test requirement, the four sets of bipolar plate voltage acquisition modules are uniformly distributed, and the measured voltage data matrix is expressed asThe voltage at the position where the ith set of devices is located is as follows:ui0,ui1,ui2monitoring the voltage data obtained for three electrode plates on each set of device;
the earth surface potential drop rate is calculated by the following formula:k represents the rate of descent.
Thus, the four sets of bipolar plate voltage measuring devices are uniformly distributed on the ground surface at a distance L determined according to the requirements of experimenters; measured data matrix is
The voltage calculation formula at the position of each set of device is as follows:
The device can calculate the earth surface potential drop rate, and the calculation formula is as follows:
The data processing module is provided with a communication interface and exchanges data with the signal control module through the communication interface.
the graphic processing module can draw the waveform of the earth surface voltage gradient along with the time change according to the earth surface voltage gradient data of the voltage acquisition module placement position calculated by the data processing module, and can obtain the human step voltage value under the corresponding voltage intensity according to the measured voltage gradient, thereby setting the protection distance.
Compared with the prior art, the method can accurately judge the voltage distribution of the time table when the grounding fault occurs on the premise of not changing the structure of the grounding device of the power transmission line; meanwhile, the voltage gradient of a point to be tested can be detected at will without locking the potential zero point to measure the potential, the original method for testing the ground potential is broken through, and the field testing workload is greatly reduced. Therefore, the invention can effectively and accurately detect the voltage distribution near the power transmission line tower on the premise of greatly reducing the field test workload, thereby taking effective measures in time and improving the operation reliability of the power transmission line.
drawings
FIG. 1 is a schematic diagram of an evaluation device for a bipolar plate of an underground power frequency voltage;
FIG. 2 is a schematic structural view of a bipolar plate voltage collecting device according to the present invention
FIG. 3 is a schematic diagram of a voltage measuring unit according to the present invention
FIG. 4 is a layout of a voltage acquisition device according to the present invention
Description of reference numerals:
100. The device comprises a power frequency voltage adjusting module, 110, a wire, 120, a copper rod electrode, 130, a grounding grid, 200, a bipolar plate voltage collecting module, 201, a metal polar plate, 202, a copper gasket, 203, a pan head screw, 204, a double-pass nylon column hexagonal internal thread isolation column, 205, an epoxy resin support, 206, an insulating wire, 210, a signal control platform, 220, a data processing module, 230, a coaxial cable, 240, a graphic processing module, 250, a wireless communication module, 260 and a voltage measuring unit.
Detailed Description
The invention aims to provide an underground power frequency voltage bipolar plate evaluation device which integrates generation, collection and analysis, and is simple in structure, convenient to operate, safe and reliable. Meanwhile, the invention provides a method for measuring and calculating the medium-power frequency voltage by using the device.
In order that those who use the apparatus will better understand the present invention, the following detailed description will be given with reference to the accompanying drawings. It should be understood that the detailed description and specific examples, while indicating the scope of the invention, are intended for purposes of illustration only and are not intended to limit the scope of the invention.
Referring to fig. 1 and 2, fig. 1 is a connection diagram of a power frequency voltage bipolar plate evaluation device in a base station according to an embodiment of the present invention; fig. 2 is a voltage collecting device of the bipolar plate of fig. 1.
In specific implementation, a power frequency 220V power supply is connected to the power frequency voltage regulation module 100, the power frequency voltage regulation module 100 includes a transformation module, a regulation module and a communication interface, the communication interface is connected to the signal control platform 210 through a coaxial cable, and the signal control platform 210 sends control signals to the transformation module and the regulation module respectively, so as to realize regulation of power frequency voltage amplitude and voltage output time; the output end of the power frequency voltage regulating module 100 is connected with the grounding grid 130 and the copper rod electrode 120 through the conducting wire 110 to form a loop. The filling depth and filling distance between the grounding grid 130 and the copper rod electrode 120 can be adjusted according to the test requirements.
The signal control platform 210 is provided with a communication interface, is connected with the power frequency voltage regulation module 100 and the data processing module 220 through a coaxial cable, and is connected with the voltage measurement unit 260 by using the wireless communication module 250 from the perspective of personal safety; the signal control platform 210 includes a single chip microcomputer control circuit, a data storage circuit and a relay signal driving circuit, the working state of the voltage measurement unit 260 can be controlled by the relay signal driving circuit, and the signal control platform 210 can send a signal to the voltage measurement unit 260 through the wireless communication module 250 to control the relay driving circuit, so as to control whether to collect data and transmit the data to the signal control platform 210. Therefore, experimenters can directly control the experiment through the signal control platform 210, and the safety and the convenience of the experiment are guaranteed.
The data processing module 220 comprises a data storage circuit and a calculation circuit; the signal control platform 210 receives the data of each path, which is measured by the voltage measurement unit and changes with time, and then transmits the data to the memory in the data processing module 220 through the data line, the voltage data collected by each path in the memory is read by the computing circuit, and the computing formula is written into the computing circuitThe data obtained by formula processing is transmitted to the graphic processing module 240; the graphic processing module 240 receives the data and draws the data to obtain a time-varying graph of the underground power frequency voltage of the bipolar plate voltage acquisition module 200; for calculating the voltage decay rate, a decay rate calculation formula is written into the calculation circuit
specifically, referring to fig. 3, fig. 3 is a schematic structural diagram of the voltage measurement unit, and a working process of the voltage measurement unit is that the voltage induced by the voltage sensing unit is used as an input in two input channels, at this time, the input is an analog quantity, and the analog quantity of the voltage is converted into a digital quantity of the voltage by the a/D converter to control and store in the memory. The voltage measuring unit 260 includes a voltage sensing unit and a data storage converter, the insulated wire 206 is connected to the data storage converter, and the CPU in the data storage converter controls the a/D conversion chip to sample the input signal, convert the signal into a digital signal, and store the digital signal in the storage chip.
Specifically, referring to fig. 2, fig. 2 shows a bipolar plate voltage acquisition module according to an embodiment of the present invention, which includes BVR14mm2Specification insulated wire 206, 5cm by 0.1cm specification metal polar plate 201, M3 copper gasket 202, specification M3 by 8 of cross head screw 203, specification M3 by 10 of double nylon column hexagonal internal thread separation column 204, right angle end with screw thread epoxy resin bracket 205; the four metal plates 201 are divided into two groups, each group having two plates; a certain insulation gap needs to be kept between the two metal plates 201, insulation isolation is achieved through two parallel M3 x 10 double-pass nylon column hexagonal internal thread isolation columns 204, the isolation columns 204 are screwed by M3 x 8 cross head screws 203 at the end parts to form a set of parallel pressure collecting plates with a distance of 10mm, M3 copper gaskets 202 are padded under the M3 x 8 cross head screws 203 at the upper end, and M3 copper gaskets 202 and BVR14mm are padded2gauge insulated wire 206; the other two metal plates 201 form another group of pressure collecting plates in the same way; the two sets of pressure collecting plates are connected through the epoxy resin bracket 205 with threads at the right-angle end part to form a firm whole; the bipolar plate voltage acquisition module 200 is arranged at a position to be measured on the ground surface, and the metal polar plate 201 is vertical to the ground surface at any angle.
Specifically, referring to fig. 4, a layout diagram of voltage measurement units is shown, four sets of voltage measurement units are distributed between a grounding grid and a grounding electrode, and the distance between each two sets is equal to L; the four sets of devices must be located on a straight line, and the relative positions of the straight line and the grounding grid can be adjusted according to the requirements of experimenters.
Claims (4)
1. The device for evaluating the bipolar plate of the underground power frequency voltage is characterized by comprising a power frequency voltage adjusting module, a copper bar electrode, a grounding grid, a data measuring module, a wireless communication module, a data processing module, a graphic processing module, a signal control platform and a bipolar plate voltage acquisition module;
the signal control platform (210) is electrically connected with the power frequency voltage regulation module (100) and is in data connection with the data processing module (220) and the wireless communication module (250); the signal control platform (210) sends a control signal to the power frequency voltage regulation module (100) to realize the regulation of the power frequency voltage amplitude and the voltage output time; the output end of the power frequency voltage regulating module (100) is connected with the grounding grid (130) and the copper bar electrode (120) through a lead (110) to form a loop; probe parts AA of the four sets of voltage measuring units are linearly distributed between the grounding grid and the grounding electrode, and the distance between every two sets is equal to L;
the four sets of bipolar plate voltage acquisition modules are composed of two sets of metal polar plates, the two sets of polar plates are supported by insulating rods in a right angle manner, and each set of polar plates is formed by two square metal polar plates which are supported by the insulating rods and stand oppositely; for each group of polar plates, an insulated wire is welded above each polar plate; the bipolar plate voltage acquisition module is arranged under the ground surface, the plane of the polar plate is vertical to the ground plane, and the arrangement angle of the polar plate is arbitrary.
2. The evaluation device of claim 1, wherein the signal control platform is in communication with the voltage measurement unit via a wireless communication module, receives voltage data information of the voltage measurement unit, and controls the working state of the voltage measurement unit.
3. The evaluation device of the bipolar plate for the intermediate frequency power voltage according to claim 1, wherein the voltage measuring unit comprises a voltage sensing unit and a data storage converter, the voltage sensing unit is connected with the insulated conducting wire on the bipolar plate, and the voltage sensing unit is connected with the data storage converter through a coaxial cable.
4. The method for evaluating the bipolar plate of the medium power frequency voltage according to the claim 1, 2 or 3, wherein the buried depth and the buried distance between the grounding grid (130) and the copper bar electrode (120) are adjusted according to the test requirement, the four sets of bipolar plate voltage acquisition modules are uniformly distributed, and the measured voltage data matrix is expressed asThe voltage at the position where the ith set of devices is located is as follows:ui0,ui1,ui2monitoring the voltage data obtained for three electrode plates on each set of device;
The earth surface potential drop rate is calculated by the following formula:k represents the rate of descent.
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| CN112147464A (en) * | 2020-09-27 | 2020-12-29 | 云南电网有限责任公司红河供电局 | Device for testing earth surface potential gradient distribution of transformer substation grounding grid |
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| CN105891606A (en) * | 2016-06-27 | 2016-08-24 | 国网甘肃省电力公司白银供电公司 | Device for testing tower grounding resistance through disassembly-free ground lead |
| CN105954573A (en) * | 2016-06-22 | 2016-09-21 | 重庆大学 | Method for measuring ground potential by use of multilayer sensor structure, and multilayer sensor structure |
| CN106199202A (en) * | 2015-05-05 | 2016-12-07 | 国家电网公司 | A kind of line steel tower grounded screen Transient grounding resistance measuring instrument |
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- 2017-05-28 CN CN201710394086.4A patent/CN107271760B/en active Active
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| CN102944771A (en) * | 2012-10-24 | 2013-02-27 | 中国电力科学研究院 | Simulation experiment device and method of alternating current, direct current and impact performance of large earth screen |
| CN104535844A (en) * | 2015-01-20 | 2015-04-22 | 国网辽宁省电力有限公司抚顺供电公司 | Method for testing grounding resistance of tower by using disassembly-free down conductor |
| CN106199202A (en) * | 2015-05-05 | 2016-12-07 | 国家电网公司 | A kind of line steel tower grounded screen Transient grounding resistance measuring instrument |
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