CN216560778U - Pole tower grounding resistance measuring device - Google Patents
Pole tower grounding resistance measuring device Download PDFInfo
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- CN216560778U CN216560778U CN202123206636.6U CN202123206636U CN216560778U CN 216560778 U CN216560778 U CN 216560778U CN 202123206636 U CN202123206636 U CN 202123206636U CN 216560778 U CN216560778 U CN 216560778U
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Abstract
The utility model provides a tower grounding resistance measuring device, which comprises four groups of measuring units, wherein each group of measuring unit comprises a current measuring module and a voltage generating module; the current measuring module and the voltage generating module in each group of measuring units are connected with the data processing module in a wired or wireless communication mode, and the data processing module is connected with the human-computer interaction module. According to the tower grounding resistance measuring device, any grounding down lead does not need to be detached and auxiliary grounding electrodes do not need to be arranged in the measuring process, the working time of grounding resistance measuring personnel is reduced, and the adverse effect of frequently disassembling and assembling the grounding down lead on a grounding system is reduced.
Description
Technical Field
The utility model relates to the technical field of measuring instruments for electric power towers, in particular to a tower grounding resistance measuring device.
Background
The grounding system of the electric power tower is an important protective measure for preventing lightning stroke tripping, a plurality of factors such as the size, the shape, the number, the embedding depth, the soil resistivity and the like of a grounding electrode can influence the size of grounding resistance, and the grounding resistance needs to be periodically measured in order to ensure good grounding of the electric power tower.
As shown in fig. 1, the grounding system of the power tower mainly comprises three parts: the ground wire 2, the ground connection downlead 3, ground connection net 4, wherein the ground wire also is called the lightning conductor. The method mainly aims at measuring the grounding resistance in the operation and maintenance work of the power line, and firstly, the resistance value R of a grounding grid is measured0And judging whether the grounding down lead is in good contact with the grounding grid.
At present, the grounding resistance measurement mainly comprises a tripolar method (a megger method) and a clamp meter method.
The electrical connection between the tower body and the grounding grid is required to be completely disconnected before the three-pole method is used for measurement, the grounding resistance measurement is widely applied to the grounding resistance measurement when the grounding down lead is not connected with the grounding grid before the power line is checked and accepted, in the three-pole method, a common grounding resistance tester provides two auxiliary grounding electrodes, and the circuit is as shown in fig. 2.
The clamp meter method does not need to set an auxiliary grounding electrode, the procedure of measuring the grounding resistance is simplified, the grounding downlead is detached to only leave one grounding downlead before measurement, a clamp meter method measuring circuit is shown in figure 3, in order to judge whether a grounding system of an electric power tower has a problem, the grounding resistance values corresponding to different grounding downleads need to be measured in sequence, the grounding downleads need to be disassembled and assembled for the tower with four grounding downleads for twelve times, time and labor are consumed, and the connection reliability of the grounding downleads is easily damaged in the disassembling and assembling process.
SUMMERY OF THE UTILITY MODEL
In order to solve the problems existing in the prior art, the application provides a tower ground resistance measuring device, so that the problems that a ground down lead needs to be detached and an auxiliary grounding electrode needs to be arranged when the traditional electric tower ground resistance is measured are solved, and the working efficiency of measuring personnel is greatly improved while the reliability of a measuring result is ensured.
In order to achieve the above object, the present application provides a tower ground resistance measuring device, including four groups of measuring units, each group of measuring unit includes a current measuring module and a voltage generating module, one group of measuring units is used for connecting to a ground down conductor, the current measuring module in the group of measuring units is used for measuring the current on the ground down conductor, and the voltage generating module in the group of measuring units is used for generating a preset induced electromotive force in a corresponding loop; the current measuring module and the voltage generating module in each group of measuring units are connected with the data processing module in a wired or wireless communication mode, and the data processing module is connected with the human-computer interaction module.
In some embodiments, the four current measuring modules are respectively referred to as a first current measuring module, a second current measuring module, a third current measuring module and a fourth current measuring module, the four voltage generating modules are respectively referred to as a first voltage generating module, a second voltage generating module, a third voltage generating module and a fourth voltage generating module, wherein the first current measuring module and the first voltage generating module are both connected with a first wireless communication module, the second current measuring module and the second voltage generating module are both connected with a second wireless communication module, the third current measuring module and the third voltage generating module are both connected with a third wireless communication module, the first wireless communication module, the second wireless communication module and the third wireless communication module are all in wireless communication with a fourth wireless communication module, and the fourth wireless communication module is connected with a data processing module, the fourth current measuring module and the fourth voltage generating module are connected with the data processing module in a wired mode.
The beneficial effect of this scheme of this application lies in above-mentioned shaft tower ground resistance's measuring device, in the measurement process, need not to demolish any ground connection downlead and arrange supplementary earthing pole, has reduced ground resistance survey crew's operating time, has effectively improved work efficiency to reduce the harmful effects that frequent dismouting ground connection downlead brought to the ground system.
Drawings
Fig. 1 shows a schematic diagram of a prior art grounding system for a power tower.
Fig. 2 shows a circuit diagram of a prior art three-pole method for measuring ground resistance.
Fig. 3 shows a circuit diagram of a prior art clamp meter method for measuring ground resistance.
Fig. 4 shows a schematic diagram of a ground resistance measurement circuit based on multi-loop current measurement in an embodiment.
Fig. 5 shows a schematic diagram of a tower ground resistance measuring device in an embodiment.
Reference numerals: the system comprises a power tower, a 2-ground wire, a 3-ground down lead, a 4-ground net, a 5-first current measuring module, a 6-first voltage generating module, a 7-first wireless communication module, a 8-second current measuring module, a 9-second voltage generating module, a 10-second wireless communication module, a 11-third current measuring module, a 12-third voltage generating module, a 13-third wireless communication module, a 14-fourth wireless communication module, a 15-data processing module, a 16-fourth current measuring module, a 17-fourth voltage generating module and a 18-man-machine interaction module.
Detailed Description
The following further describes embodiments of the present application with reference to the drawings.
In the description of the present application, it is to be understood that the terms "first", "second", and the like are used for distinguishing similar objects and not for describing or indicating a particular order or sequence, and that the terms "upper", "lower", "front", "rear", "left", "right", "top", "bottom", "inner", "outer", and the like indicate orientations or positional relationships based on those shown in the drawings, and are used merely for convenience of description and simplification of description, but do not indicate or imply that the referred device or element must have a particular orientation, be constructed in a particular orientation, and be operated, and thus should not be considered as limiting the present application.
In the prior art, an electric power tower 1 is generally connected with a grounding grid 4 through four grounding downleads 3, and a grounding resistance equivalent circuit is shown in fig. 4, wherein the resistance value of the grounding grid 4 is R0The resistance value of the first grounding down lead is R1Second ground down leadHas a resistance value of R2The resistance value of the third grounding down lead is R3The fourth grounding down lead has a resistance of R4. Therefore, the tower ground resistance to be measured is the resistance value of the first loop: (R)0+R1) Resistance value of the second loop: (R)0+R2) Resistance value of the third loop: (R)0+R3) And resistance value of the fourth loop: (R)0+R4). When the grounding down lead 3 is in good contact with the grounding grid 4, R1、R2、R3、R4The resistance value is close to 0, and the grounding resistance is mainly the grounding grid resistance value R0。
As shown in fig. 5, the tower ground resistance measuring device according to the present application includes four sets of measuring units, each set of measuring unit includes a current measuring module and a voltage generating module, one set of measuring unit is used for connecting to a ground down conductor 3, the current measuring module in the set of measuring unit is used for measuring the current on the ground down conductor, and the voltage generating module in the set of measuring unit is used for generating a preset induced electromotive force in a corresponding loop; the current measuring module and the voltage generating module in each group of measuring units are connected with the data processing module 15 in a wired or wireless communication mode, and the data processing module 15 is connected with the human-computer interaction module 18.
In this embodiment, the current measurement module is shaped as a jaw capable of being opened and closed, the opening and closing angle and the shape and size of the jaw are convenient to clamp on the grounding down-lead of the transmission tower, and after the jaw clamps, the current value on the corresponding grounding down-lead 3 can be measured. The voltage generation module is an openable jaw, the opening and closing angle and the shape and size of the voltage generation module are convenient to clamp on the grounding down lead of the transmission tower, and after the jaw clamps, the voltage generation module can act on the grounding down lead to generate stable induced electromotive force.
In this embodiment, the four current measuring modules are respectively referred to as a first current measuring module 5, a second current measuring module 8, a third current measuring module 11 and a fourth current measuring module 16, the four voltage generating modules are respectively referred to as a first voltage generating module 6, a second voltage generating module 9, a third voltage generating module 12 and a fourth voltage generating module 17, wherein the first current measuring module 5 and the first voltage generating module 6 are both connected to a first wireless communication module 7, the second current measuring module 8 and the second voltage generating module 9 are both connected to a second wireless communication module 10, the third current measuring module 11 and the third voltage generating module 12 are both connected to a third wireless communication module 13, the first wireless communication module 7, the second wireless communication module 10 and the third wireless communication module 13 are all in wireless communication with a fourth wireless communication module 14, the fourth wireless communication module 14 is connected to the data processing module 15, and the fourth current measuring module 16 and the fourth voltage generating module 17 are connected to the data processing module 15 by wires.
In this embodiment, the current measuring module adopts a flexible coil current transformer, and specifically, a flexible open rogowski coil transformer with the summson brand model number SEN-CTLS1 may be adopted. The voltage generation module adopts a voltage mutual inductor, and specifically can adopt a current type voltage mutual inductor with a ZMPT107 type of a wing union brand. The wireless communication module adopts a Bluetooth communication module, and particularly can adopt a Bluetooth 5.1 master-slave one-to-many module with a New bit brand model number of XY-MBD 87A. The data processing module 15 adopts an embedded system, and specifically can adopt a launch ep9315 core board. The human-computer interaction module 18 comprises a liquid crystal screen and a thin film key panel.
The method for measuring the tower grounding resistance comprises the following steps:
And 2, starting the measurement of the tower grounding resistance by controlling the human-computer interaction module 18.
And 4, obtaining a formula (1) according to the data of the current measuring module and the voltage generating module based on KCL, KVL and ohm's law:
wherein E is1～E4Respectively representing induced electromotive forces, which are known quantities, generated for the first time by the voltage generation modules installed on the first to fourth ground downleads; i is1～I4Respectively representing the current values measured for the first time by the current measuring modules arranged on the first to fourth grounding downleads, wherein the current values are known quantities; r0Representing the resistance, R, of the earth grid 41Representing the resistance, R, of the first down conductor2Represents the resistance value, R, of the second down lead3Represents the resistance value, R, of the third down-lead4Representing the resistance of the fourth down-lead.
Step 5, adjusting any one of the voltage generating modules, so that when the induced electromotive force generated by the voltage generating module is E, the current value measured by the corresponding current measuring module is zero, thus obtaining the formula (2):
wherein, I'1～I′4And respectively represent the current values measured by the current measuring modules mounted on the first to fourth ground downleads for the second time, which are known quantities.
In this embodiment, in order to improve the measurement accuracy of the ground resistance, the current measurement module with the largest amplitude value among the four current values measured in step 4 is selected as the voltage generation module of the same set of measurement units, and the voltage generation module is adjusted so that when the induced electromotive force generated by the voltage generation module is E, the current value measured by the corresponding current measurement module is zero.
Step 6, combining the formulas (1) and (2), R can be obtained0、R1、R2、R3、R4And then the grounding resistance of the electric power tower is obtained, and the values are respectively the resistance values of the first circuit: (R)0+R1) Resistance value of the second loop: (R)0+R2) Resistance value of the third loop: (R)0+R3) And resistance value of the fourth loop: (R)0+R4)；R0Representing the resistance, R, of the earth grid 41Representing the resistance, R, of the first down conductor2Represents the resistance value, R, of the second down lead3Represents the resistance value, R, of the third down-lead4Representing the resistance of the fourth down-lead.
And 7, outputting a measurement result through the human-computer interaction module 18.
The utility model relates to a shaft tower ground resistance's measuring device has following advantage: the measuring device is safe, reliable, light and easy to operate, and is suitable for all electric power towers connected with a grounding grid through grounding down leads; in the measuring process, any grounding downlead does not need to be dismantled and auxiliary grounding electrodes do not need to be arranged, the working time of grounding resistance measuring personnel is reduced, the working efficiency is effectively improved, and the adverse effect of frequently disassembling and assembling the grounding downlead on a grounding system is reduced.
The above description is only for the preferred embodiments of the present application, but the scope of the present application is not limited thereto, and any person skilled in the art can substitute or change the technical solution of the present application and its concept within the technical scope of the present application, and shall be covered by the scope of the present application.
Claims (2)
1. The utility model provides a measuring device of shaft tower ground resistance which characterized in that: the device comprises four groups of measuring units, wherein each group of measuring unit comprises a current measuring module and a voltage generating module, one group of measuring units is used for being connected to a grounding downlead, the current measuring modules in the group of measuring units are used for measuring the current on the grounding downlead, and the voltage generating modules in the group of measuring units are used for generating preset induced electromotive force in corresponding loops; the current measuring module and the voltage generating module in each group of measuring units are connected with the data processing module in a wired or wireless communication mode, and the data processing module is connected with the human-computer interaction module.
2. The tower ground resistance measuring device of claim 1, characterized in that: the four current measuring modules are respectively recorded as a first current measuring module, a second current measuring module, a third current measuring module and a fourth current measuring module, the four voltage generating modules are respectively recorded as a first voltage generating module, a second voltage generating module, a third voltage generating module and a fourth voltage generating module, wherein the first current measuring module and the first voltage generating module are both connected with a first wireless communication module, the second current measuring module and the second voltage generating module are both connected with a second wireless communication module, the third current measuring module and the third voltage generating module are both connected with a third wireless communication module, the first wireless communication module, the second wireless communication module and the third wireless communication module are all in wireless communication with the fourth wireless communication module, and the fourth wireless communication module is connected with a data processing module, the fourth current measuring module and the fourth voltage generating module are connected with the data processing module in a wired mode.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202123206636.6U CN216560778U (en) | 2021-12-20 | 2021-12-20 | Pole tower grounding resistance measuring device |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202123206636.6U CN216560778U (en) | 2021-12-20 | 2021-12-20 | Pole tower grounding resistance measuring device |
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| CN216560778U true CN216560778U (en) | 2022-05-17 |
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| CN202123206636.6U Active CN216560778U (en) | 2021-12-20 | 2021-12-20 | Pole tower grounding resistance measuring device |
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