CN210465544U - Detection system and monitoring network for grounding system resistance parameters - Google Patents
Detection system and monitoring network for grounding system resistance parameters Download PDFInfo
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- CN210465544U CN210465544U CN201921062922.XU CN201921062922U CN210465544U CN 210465544 U CN210465544 U CN 210465544U CN 201921062922 U CN201921062922 U CN 201921062922U CN 210465544 U CN210465544 U CN 210465544U
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Abstract
The utility model discloses a detecting system and control net of ground connection system resistance parameter. Wherein, detecting system includes: the driving electrodes are connected with the current output end of the monitor, arranged on a plurality of road sections of the grounding system path and used for outputting driving current to the plurality of road sections; the induction electrodes and the driving electrodes are arranged on a plurality of road sections in pairs and used for detecting response voltages generated by the road sections; the current sensing device is connected with the current acquisition input end of the monitor, sleeved on the down lead and used for sensing the response current flowing through the down lead; and the monitor is used for determining the resistance parameter of the grounding system path according to the driving current, the response voltage and the response current. The utility model provides an only carry out local detection and lead to the easy technical problem who is missed measure the false retrieval of grounding system trouble to grounding system among the correlation technique.
Description
Technical Field
The utility model relates to an electrical safety detects technical field, particularly, relates to a detecting system and control net of ground connection system resistance parameter.
Background
Grounding is a safe connection between some important devices and the ground, and is the most fundamental safety protection measure when the related devices have power failure. Oil storage tanks, transformers, transmission towers, buildings and the like all require reliable grounding, and the reliability of a grounding system is checked regularly. For example, in each oil depot, in order to ensure the reliability of the lightning and static protection grounding system of the oil storage tank and avoid accidents such as oil depot fire caused by the failure of effective discharge of lightning current or static electricity, it is necessary to detect relevant resistance parameters of the grounding system of the oil storage tank. If the measured related resistance parameter is within the qualified range specified by the standard, the grounding system is considered to be reliable; otherwise, the grounding system may have the faults of loosening, breaking, rusting, poor grounding and the like, and the grounding system needs to be overhauled.
Taking the grounding of the oil storage tank as an example, a typical grounding system is shown in fig. 1, the oil storage tank is led to the ground through the front down lead, the left turn plate, the disconnection clip, the right turn plate, the rear down lead and the grounding body, and therefore, the total resistance of the oil storage tank grounding system path is: rGeneral assembly＝R1+R2+…+R10Wherein R is1Represents the contact resistance, R, between the oil tank and the leading-end down conductor2Indicating the welding resistance, R, inside the leading down conductor3、R6Representing the contact resistance, R, between the down conductor and the adapter plate4、R5Indicating the contact resistance, R, between the adapter plate and the disconnection card7Indicating the welding resistance, R, inside the rear downlead8Indicating the welding resistance, R, between the rear downlead and the ground body9Indicating the contact resistance, R, between the earth and the ground10Representing the electrical resistance to flow of the soil. Since the ground body and the down conductor are good conductors themselves and the body resistance is extremely small, R is a factorGeneral assemblyDo not include these bulk resistances. Total resistance R in the path of the grounding systemGeneral assemblyIn, R1+R2+…+R8As down conductor resistance, R9+R10Is a ground body to ground resistance.
In actual detection, limited by detection technology and instrument functions, and for the convenience of detection work, most of the cases are that the internal welding and each part bridging of the down lead from the oil storage tank to the test well are considered to be sufficiently good according to experience, namely R is considered to be1+R2+…+R50. The assumption here is madeNext, a disconnection clamp is opened at the test well, or a current detection clamp is assisted on the rear end down conductor according to a selective electrode method, only the ground resistance part of the test well in the grounding system shown in FIG. 1 (namely, the local path resistance R from the test well to the ground through the rear end down conductor and the grounding bodyWell＝R6+R7+…+R10) And (6) detecting. If the detection result of the ground resistance of the test well is less than 10 omega or 100 omega, the grounding system is considered to be qualified and reliable for lightning protection or static prevention. Obviously, the detection method in the prior art only detects part of the grounding system, and the detection result does not completely reflect the resistance R of the grounding system pathGeneral assemblyA fault in the path to the earth system from the tank to the test well in figure 1 cannot be detected.
In addition to the above-described detection method, in many cases, a pincer-type loop resistance detector is used for a down conductor near a test well to detect loop resistance values of loops formed by the front and rear down conductors and the ground soil, thereby substantially reflecting the reliability of the ground system path. However, the loop resistance value obtained by the detection method still does not represent the path resistance (R) of the grounding system which is really concerned from the safety point of viewGeneral assembly) Therefore, faults occurring to the grounded system path still result in missed or false detection.
In view of the technical problem in the related art that a fault of the ground system is easily missed and detected due to the fact that only the ground system is locally detected, an effective solution is not provided at present.
SUMMERY OF THE UTILITY MODEL
The utility model provides a detecting system and control net of grounding system resistance parameter to only carry out local detection to the grounding system and lead to the easy technical problem who is missed measure the false retrieval of grounding system trouble in solving the correlation technique at least.
According to an aspect of the present invention, there is provided a grounding system resistance parameter detection system, including: the driving electrodes are connected with the current output end of the monitor, arranged on a plurality of road sections of a grounding system path and used for outputting driving current to the road sections, wherein the grounding system path at least comprises a grounded device, a grounding body and a down lead for connecting the grounded device and the grounding body; the induction electrodes and the driving electrodes are arranged on a plurality of road sections in pairs and used for detecting response voltages generated by the road sections; the current sensing device is connected with the current acquisition input end of the monitor, sleeved on the down lead and used for sensing the response current flowing through the down lead; and the monitor is used for determining the resistance parameter of the grounding system path according to the driving current, the response voltage and the response current.
According to another aspect of the present invention, there is provided a monitoring network, including: at least one detection system for the resistance parameter of the grounding system; and the monitoring network host is connected with the monitors in the detection systems in a wired communication or wireless communication mode, and is used for sending setting parameters and monitoring instructions to the monitors and receiving resistance parameters from the monitors.
The utility model discloses in, the detecting system of ground connection system resistance parameter, include: the driving electrodes are connected with the current output end of the monitor, arranged on a plurality of road sections of a grounding system path and used for outputting driving current to the road sections, wherein the grounding system path at least comprises a grounded device, a grounding body and a down lead for connecting the grounded device and the grounding body; the induction electrodes and the driving electrodes are arranged on a plurality of road sections in pairs and used for detecting response voltages generated by the road sections; the current sensing device is connected with the current acquisition input end of the monitor, sleeved on the down lead and used for sensing the response current flowing through the down lead; and the monitor is used for determining the resistance parameter of the grounding system path according to the driving current, the response voltage and the response current. According to the scheme, the driving currents are applied to the road sections, the corresponding response voltages and the corresponding response currents are detected, the incidence relation of the parameters is established based on the circuit principles of ohm law, kirchhoff law and the like, the purpose of accurately acquiring the grounding resistance of the grounded device, the resistance parameters of the grounding system channel and the overall reliability information of the grounding system channel is achieved, and the technical problem that faults of the grounding system are easily missed to detect and detect due to the fact that only the grounding system is locally detected in the related technology is solved.
Drawings
The accompanying drawings, which are described herein, serve to provide a further understanding of the invention and constitute a part of this specification, and the exemplary embodiments and descriptions thereof are provided for explaining the invention without unduly limiting it. In the drawings:
FIG. 1 is a schematic diagram of an exemplary grounding system, such as the grounding of an oil storage tank;
fig. 2 is a schematic diagram of an alternative grounding system resistance parameter detection system according to an embodiment of the present invention;
fig. 3 is an equivalent circuit diagram of the ground path of an alternative grounded device according to an embodiment of the invention;
fig. 4 is a schematic diagram of an installation connection of an alternative grounding system resistance parameter detection system according to an embodiment of the present invention; and
fig. 5 is a schematic diagram of an installation connection of another alternative grounding system resistance parameter detection system according to an embodiment of the present invention.
Wherein the figures include the following reference numerals:
10. a drive electrode; 20. a monitor; 30. an induction electrode; 40. a current sensing device; 50. a grounding system; 60. a grounded device; 70. the earth; 51. a ground body; 52. test wells 53, down conductor.
Detailed Description
In order to make the technical solution of the present invention better understood, the technical solution of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative efforts shall belong to the protection scope of the present invention.
It should be noted that the terms "first," "second," and the like in the description and claims of the present invention and in the drawings described above are used for distinguishing between similar elements and not necessarily for describing a particular sequential or chronological order. It is to be understood that the objects so described are interchangeable under appropriate circumstances such that the embodiments of the invention described herein are capable of operation in other sequences than those illustrated or otherwise described herein. Furthermore, the terms "comprises," "comprising," and "having," and any variations thereof, are intended to cover a non-exclusive inclusion, such that a process, method, system, article, or apparatus that comprises a list of steps or elements is not necessarily limited to those steps or elements expressly listed, but may include other steps or elements not expressly listed or inherent to such process, method, article, or apparatus.
Example 1
Before describing further details of embodiments of the present invention, an alternative ground system resistance parameter detection system that may be used to implement the principles of the present invention will be described with reference to fig. 2. In its most basic configuration, fig. 2 is a schematic diagram of a detection system for a ground system resistance parameter in accordance with the present disclosure. For purposes of description, the depicted architecture is only one example of a suitable environment and is not intended to suggest any limitation as to the architecture, scope of use, or functionality of the system, nor is it intended that the detection system be interpreted as having any dependency or requirement relating to any one or combination of components illustrated in FIG. 2.
As shown in fig. 2, the system for detecting the resistance parameter of the grounding system provided by this embodiment includes:
and a plurality of driving electrodes 10 connected to the current output terminal of the monitor 20, provided at a plurality of sections of a grounding system path for outputting driving currents to the plurality of sections, wherein the grounding system path includes at least a grounded device 60, a grounding body 51, and a down conductor 53 connecting the grounded device 60 and the grounding body 51.
In an alternative, the driving electrode may be a metallic conductor, such as a cold-pressed terminal made of brass or copper; the grounding system passage is a passage which is specially arranged for safe grounding and flows to the ground from a grounded device, and can comprise the grounded device, a down conductor and a grounding body; in addition to the above-mentioned grounding system path, all grounding paths of the grounded device may include paths from the grounded device to the ground through supporting members such as a base, a supporting frame, and a foot stand thereof, and external connecting accessories such as interconnecting pipes, lines, and bridges between the grounded device and other devices or facilities, wherein the grounded device may be an oil storage tank, a transformer, a power transmission tower, a building, an electrical apparatus, or the like.
Specifically, the monitor may have a plurality of input/output ports, the plurality of driving electrodes are connected to the plurality of output ports of the monitor one by one, and the monitor may apply a driving current of a known current magnitude to any section of the ground system path through the driving electrodes, where the magnitude and direction of the driving current may be controllable, for example, for safety, the magnitude of the driving current may be a weak driving current meeting intrinsic safety standards.
The driving electrode located underground can also be a rod-shaped metal body with an anti-rust function, and one end of the metal body can be conical, so that the driving electrode is beneficial to being inserted underground, and the influence on the service life of the electrode due to the corrosion of soil is avoided. In addition, because the grounding net is a "big" grounding body, so the utility model provides a grounding body includes the grounding net.
And a plurality of sensing electrodes 30 connected to the voltage input terminal of the monitor 20, wherein the plurality of sensing electrodes 30 and the plurality of driving electrodes 10 are disposed at a plurality of road sections in pairs for detecting response voltages generated at the plurality of road sections.
In an alternative, the induction electrode may also be a metal conductor, such as a cold-pressed terminal made of brass or copper. Similarly, the induction electrode located underground may be a rod-shaped metal body having an antirust function, and one end of the metal body may be conical.
Specifically, a plurality of induction electrodes are connected with a plurality of input ports of the monitor one by one, and the driving electrodes and the induction electrodes are arranged in pairs under the ground in a plurality of road sections of a grounding system passage and a direction away from the grounding body by a certain distance and far away from the direction of the grounded device. Thus, if the monitor applies a driving current with a known current magnitude to a certain section of the grounding system path through the driving electrode, the response voltage generated by the section can be detected through the sensing electrode.
Since the driving electrode is used to apply a current to the ground system path and the sensing electrode is used to detect a voltage of a path to which the current is applied, the driving electrode and the sensing electrode mounted on the ground system path should be mounted as close as possible but cannot be in direct contact with each other. However, for the driving electrode and the sensing electrode installed under the ground, in order to avoid the influence of the stray electric field on the detection result, the distance between the driving electrode and the grounding body should ensure that the stray electric fields of the driving electrode and the grounding body cannot be overlapped, and the sensing electrode should be located at the middle positions of the driving electrode and the grounding body and outside the stray electric fields of the grounding body and the driving electrode.
And the current sensing device 40 is connected with the current acquisition input end of the monitor 20, is sleeved on the down lead 53 and is used for sensing the response current flowing through the down lead 53.
In an alternative, the current sensing device may be an annular current sensor or a pincerlike current sensor, and is conveniently sleeved on a down conductor of a ground system channel.
Specifically, the current sensing device is sleeved on a down lead of a grounding system channel, and the output end of the current sensing device is connected with a current acquisition input port of the monitor. Thus, if the monitor applies a driving current with a known current to a certain section of the grounding system path through the driving electrode, the response voltage generated by the section can be detected through the sensing electrode, and the response current on the down conductor can be detected through the current sensing device.
And the monitor 20 is used for determining the resistance parameter of the grounding system path according to the driving current, the response voltage and the response current.
In an alternative, the resistance parameter may be a total grounding resistance, a down conductor to ground resistance, a ground resistance of a grounding body, a total grounding system path resistance, and the like of the grounded device, and by determining whether the resistance parameter exceeds a standard specified limit value, it may be determined whether the grounding system path has a possibility of a fault such as loosening, breaking, rusting, poor grounding, and the like, and further determine the reliability of the grounding system.
Because the detection of the ground parameters in the prior art usually adopts a manual detection mode, even if the detection at a certain time shows that the ground resistance meets the requirement, the conditions of local corrosion and fracture, loosening of a lap joint part, oxidation and rusting of a contact surface and the like can completely occur in the grounding system before the next detection along with the passage of time, so that the missed detection of the faults of the grounding system is caused, namely the qualified detection result cannot ensure the long-term reliability of the grounding system. In fact, between two detections, the oxidation and corrosion of the contact surface of the lap joint part of the down conductor can certainly happen; if a lightning strike occurs in this case, the ground protection is inevitably ineffective and an accident occurs.
In view of the above, the connection relationship among the plurality of driving electrodes, the plurality of induction electrodes, the current sensing device, the monitor, and the grounded device may be either in a ready-to-use state or in a long-term fixed state. When a long-time fixed installation mode is adopted, the grounding system of the grounded device can be monitored on line in real time or automatically and periodically.
In an alternative embodiment, real-time monitoring of the tank grounding system is required. In the grounded system path from the oil tank to the earth, there are components such as down-leads, test wells, grounding bodies, etc. The driving electrodes and the sensing electrodes are arranged in pairs on different sections of the path of the grounding system and at predetermined positions of the earth. The current output end of the monitor is connected with the driving electrode, the voltage input end is connected with the induction electrode, and the current acquisition input end is connected with the current sensing device. The monitor sequentially applies weak driving current meeting intrinsic safety standards to a plurality of road sections of the grounding system passage, then detects response voltage generated by the corresponding road section through the induction electrode, detects response current on the down lead through the current sensing device, establishes an incidence relation among the parameters according to the circuit principles of ohm law, kirchhoff law and the like, obtains related resistance parameters of the grounding system passage to be detected through solving the incidence relation, and accordingly judges whether the grounding system of the oil storage tank is qualified or not. For example, it can be determined whether the grounding system has a fault problem such as corrosion, loosening, and breakage by determining whether the relevant resistance value of the grounding system path exceeds a prescribed limit.
The embodiment of the utility model provides an in, the detecting system of ground connection system resistance parameter includes: the driving electrodes are connected with the current output end of the monitor, arranged on a plurality of road sections of a grounding system path and used for outputting driving current to the road sections, wherein the grounding system path at least comprises a grounded device, a grounding body and a down lead for connecting the grounded device and the grounding body; the induction electrodes and the driving electrodes are arranged on a plurality of road sections in pairs and used for detecting response voltages generated by the road sections; the current sensing device is connected with the current acquisition input end of the monitor, sleeved on the down lead and used for sensing the response current flowing through the down lead; and the monitor is used for determining the resistance parameter of the grounding system path according to the driving current, the response voltage and the response current. According to the scheme, the driving currents are applied to the road sections, the corresponding response voltages and the response currents flowing through the down lead are detected, the incidence relation of the parameters is established based on the circuit principles of ohm law, kirchhoff law and the like, the purpose of accurately obtaining the relevant resistance parameter values of the whole to-be-detected grounding system access is achieved, and the technical problem that faults of the grounding system are easy to miss-detect and error-detect due to the fact that only local detection is conducted on the grounding system in the related technology is solved.
Alternatively, if the grounded device 60 has a support member and/or an external attachment, the grounding path of the grounded device 60 includes three branches, the first branch is a grounding system path to the ground 70 via the down conductor 53 and the grounding body 51, the second branch is a path directly to the ground 70 via the down conductor 53, and the third branch is a path to the ground 70 via the support member and/or the external attachment.
In the alternative, the support member may be a base, support frame, foot rest or like supportive member and the attachable accessory may be a functional attachable accessory such as an interconnecting pipe, line, bridge or the like between the device to be grounded and another device or facility.
Fig. 3 is an equivalent circuit diagram of the ground path of an alternative grounded device according to the present embodiment. If the grounded device has a supporting part and an external accessory, the resistance of the part of the path needs to be taken into consideration in order to ensure the accuracy of the detection result. As shown in fig. 3, the equivalent circuit includes three branches: the first branch circuit is a specially-arranged grounding system passage from the down lead and the grounding body to the ground, and comprises a down lead resistor RLEarth resistance R of earth conductorE(ii) a The second branch is a path directly to the ground through a buried down conductor, including a down conductor resistor RLDown conductor to ground resistance RT(ii) a The third branch is a path from the supporting part and the external connection accessory to the ground, and the equivalent shunt resistance R of the path is includedS. In particular, the ground body is resistive to ground REFor grounding the internal resistance of the body to earth, down-lead resistance RLThe resistance of the down lead between the grounded device and the grounding body is mainly expressed as welding resistance and lap joint resistance at all positions on the down lead passage, and the total grounding resistance R of the grounded deviceCThe overall earth resistance presented to the earthed equipment through all possible paths to earth, such as down conductor, earth body, support member of the earthed equipment and/or external attachment, etc.
It should be noted that the number of branches of the grounding path and the equivalent circuit thereof may be different from those shown in fig. 3, and is not limited herein, according to the actual situation and condition of the device to be grounded and the grounding system thereof.
The ground path is explained in detail below by way of an example including three branches. In the installation connection diagram of the detection system for the reliability of the grounding system shown in fig. 4, the driving electrodes include a first driving electrode D2, a second driving electrode D1 and a third driving electrode D0, and the sensing electrodes include a first sensing electrode S2, a second sensing electrode S1 and a third sensing electrode S0, wherein the first driving electrode D2 and the first sensing electrode S2 are disposed at the grounded device 60; the second driving electrode D1 and the second sensing electrode S1 are disposed on the ground system path at a predetermined distance from the ground body 51; the third sensing electrode S0 and the third driving electrode D0 are both disposed under the ground and are sequentially disposed on an extension of a line segment defined by the grounding device 60 and the grounding body 51, and the third sensing electrode S0 is located outside the stray electric field of the third driving electrode D0 and the grounding body.
In an alternative, the preset distance may be 0, that is, the second driving electrode D1 and the second sensing electrode S1 are disposed on the grounding body, and the preset distance may also be a distance from the grounding body to a position point on the down lead next to the grounding body, for example, 5cm, 3cm, etc.; the line segment is determined based on a top view angle, and further, when viewed from the top view angle downwards, the center point of the third driving electrode, the center point of the third sensing electrode, the center point of the grounding body and the center point of the grounded device are sequentially located on the same straight line.
Specifically, the first driving electrode D2 and the first sensing electrode S2 are mounted on a conductive portion of the body, such as a metal frame or a metal case of the device to be grounded, which is suitable for grounding, and the second driving electrode D1 and the second sensing electrode S1 are mounted on the grounding body or a down-lead closely adjacent to the grounding body. The first driving electrode D2, the first sensing electrode S2, the second driving electrode D1 and the second sensing electrode S1 can be formed by welding upper leads with brass/red copper cold-pressed connecting terminals, the first driving electrode D2 and the first sensing electrode S2 are fastened and mounted on a main body conducting part of the grounded device in pairs by bolts/nuts, and the second driving electrode D1 and the second sensing electrode S1 are fastened and mounted on the grounded body or a down lead close to the grounded body. It should be noted that the first driving electrode D2 and the first sensing electrode S2, and the second driving electrode D1 and the second sensing electrode S1 are installed as close as possible, but are not in direct contact with each other.
According to the installation conditions of the third driving electrode and the third sensing electrode, for most of the soil resistivity, the third driving electrode D0 can be installed under the ground about 40m away from the grounded device, and the third sensing electrode S0 can be installed under the ground at the middle position between the third driving electrode D0 and the grounded body. The third driving electrode D0 and the third sensing electrode S0 may be copper rod electrodes or other metal rod electrodes subjected to surface rust-proofing treatment such as zinc plating, and are buried under the ground away from the grounded device by about 40m and 20m from the grounded body, respectively.
Through the fixed installation mode, the monitor can comprehensively and accurately monitor each resistance value of the grounding system and the system reliability, overcomes the problems of complicated operation of manual detection, incomplete detection of the grounding system, incapability of timely detecting faults of the grounding system and the like, and avoids false detection or missing detection of faults of the grounding system such as corrosion, breakage and the like.
The principle of real-time online monitoring of the resistance parameter of the detection system of the resistance parameter of the grounding system in this embodiment is explained in detail below. The first and second driving electrodes D2 and D1 input the first driving current I to a section between the first and second driving electrodes D2 and D1D12(ii) a The second and third driving electrodes D1 and D0 input the second driving current I to a section between the second and third driving electrodes D1 and D0D10(ii) a The first and third driving electrodes D2 and D0 input the third driving current I to a section between the first and third driving electrodes D2 and D0D20。
In one alternative, the first, second and third driving currents may be weak driving currents, which are in accordance with intrinsic safety standards, and whose magnitudes are known.
It should be noted that, since too many grounding systems of electric power equipment are mainly used for grounding protection against ac power, the results measured by the prior art are mostly ac grounding resistances of the devices to be grounded. However, for the practical working conditions of lightning protection and static prevention of the oil storage tank grounding system, the alternating current grounding resistance can not reflect the direct current grounding resistance during static discharge and can not reflect the impulse grounding resistance during lightning discharge. Therefore, the applicability of the results obtained by the existing grounding system detection techniques still has certain problems. In addition, most of the existing detectors generate high voltage or large current in the detection process, for example, the excitation voltage in the detection process can be as high as four and fifty volts to one and two and hundred volts, and the current can be as high as tens of amperes. For the detection object and the site of the oil storage tank grounding system, whether the oil in the tank or the high-concentration oil gas possibly appearing in the reservoir area outside the tank, the appearance of high voltage or large current is a potential safety hazard.
In view of the above, the utility model discloses a drive current can set up as required, specifically, not only drive current's waveform can also be for direct current and impulse except exchanging for the tradition, can detect the direct current resistance parameter and the impulse resistance parameter of oil storage tank ground system to the condition that static was released and thunder and lightning were released, and drive current's size can be for the weak drive current who accords with essence safety standard moreover, can not produce high voltage or heavy current in the testing process, and the security performance is good.
Still taking fig. 4 as an example, if the driving current is applied, the first and second sensing electrodes S2 and S1 detect the first response voltage V of the section between the first and second sensing electrodes S2 and S1S12While the current sensing device 40 senses a first response current I flowing through the down conductorL12(ii) a The second and third sensing electrodes S1 and S0 sense a second response voltage V of a section between the second and third sensing electrodes S1 and S0S10While the current sensing device 40 senses a second response current I flowing through the down conductorL10(ii) a The first and third sensing electrodes S2 and S0 sense a third sensing voltage V of a section between the first and third sensing electrodes S2 and S0S20While the current sensing device 40 senses a third response current I flowing through the down conductorL20。
Optionally, the current sensing device 40 is disposed on the down-lead between the second driving electrode D1/the second sensing electrode S1 and the grounding body 51; or the current sensing device 40 is disposed on the down conductor 53 between the grounded device 60 and the second driving electrode D1\ the second sensing electrode S1.
It should be noted that the current sensing device CT is externally mounted on the down conductor abutting against the grounded device end or abutting against the grounded body end for detecting the response current flowing through the down conductor. If the jacket is placed on the down lead next to the end of the grounding body, it can be located between the second driving electrode D1/second sensing electrode S1 and the grounding body, as shown in FIG. 4, or between the second driving electrode D1/second sensing electrode S1 and the grounded device 60, as shown in FIG. 5.
Optionally, the monitor 20 determines various resistance parameters of the grounding system path according to the driving current, the response voltage and the response current, including: based on the ohm law, kirchhoff law and other circuit principles, the first driving current I is obtainedD12A first response voltage VS12And a first response current IL12A first relationship model therebetween; obtaining a second driving current I based on the ohm law, kirchhoff law and other circuit principlesD10A second response voltage VS10And a second response current IL10A second relationship model therebetween; obtaining a third driving current I based on the circuit principles of ohm law, kirchhoff law and the likeD20A third response voltage VS20And a third response current IL20A third relationship model therebetween; and determining each resistance parameter of the to-be-tested grounding system access according to the first relation model, the second relation model and the third relation model.
With reference to fig. 3 and 4, according to the series-parallel relationship of the resistances of the grounding branches of the grounded device, the following equation set is written by using ohm law, kirchhoff voltage law and kirchhoff current law:
solving the above equation set can obtain the total grounding resistance R of the grounded deviceCDown lead resistor RLAnd a ground resistance R of the ground bodyEAnd the critical resistance parameters of the grounding system path. If the current sensing device is mounted on the down-lead on the grounded device side next to the second driving electrode D1 and the second sensing electrode S1 as shown in fig. 5, or mounted on the down-lead on the grounded device side, the solving process is similar to the above method, and will not be described again.
Optionally, the first driving electrode D2, the second driving electrode D1, the first sensing electrode S2 and the second sensing electrode S1 are round cold-pressed terminals made of brass or red copper.
Specifically, the first driving electrode D2 and the first sensing electrode S2, the second driving electrode D1 and the second sensing electrode S1 may be formed by welding upper leads with brass/red copper round cold-pressed terminals, and then the first driving electrode D2 and the first sensing electrode S2 are fastened and mounted in pairs on the conductive portion of the body of the grounded device 60 by bolts/nuts, and the second driving electrode D1 and the second sensing electrode S1 are fastened and mounted on the grounded body or on the lower lead abutting against the grounded body.
It should be noted that the first driving electrode D2 and the first sensing electrode S2, and the second driving electrode D1 and the second sensing electrode S1 are installed as close as possible, but are not in direct contact with each other.
Alternatively, the third driving electrode D0 and the third sensing electrode S0 are rod-shaped metal electrodes having a rust prevention function.
Specifically, the third driving electrode D0 and the third sensing electrode S0 may be rod-shaped metal bodies having a rust-proof function, and one end of the metal bodies may be conical.
Optionally, the monitor 20 includes a display.
In the alternative, a display may be used to display the resistance parameter and the overrun condition, such as the total resistance to ground R of the grounded device 60CResistance R of lower leadLAnd a ground resistance R of the ground bodyEAnd the like.
Whether the grounding system is qualified or not can be judged according to whether the resistance parameters exceed the specified limit value or not, whether the grounding system has the fault problems of corrosion, loosening, breakage and the like or not is judged, corresponding resistance parameters and the overrun state of the resistance parameters are displayed on a display screen of the monitor 20, the grounding parameters of the grounded device 60 are acquired in real time for a long time, and whether the grounding protection work of the grounding device is done or not is analyzed and judged.
Optionally, monitor 20 further comprises a wired communication module and/or a wireless communication module.
In an alternative, the wired communication module may be an RS-485 communication module.
In another alternative, the wireless communication module may include an antenna. The monitor 20 can transmit the detected resistance parameters to the monitoring network host in real time through the antenna.
Example 2
According to the embodiment of the utility model provides a monitor net is provided, include:
at least one embodiment 1 provides a system for detecting a resistance parameter of a grounded system;
and the monitoring network host is connected with the monitors in the detection systems in a wired communication or wireless communication mode, and is used for sending setting parameters and monitoring instructions to the monitors, receiving resistance parameters of the grounding systems of the monitors, analyzing the overall reliability information of the grounding systems and the like.
The monitoring network provided by the embodiment comprises at least one detection system for the resistance parameter of the grounding system, and each detection system is communicated with the monitoring network host computer in a wired or wireless mode, so that distributed monitoring is performed on a plurality of grounded devices or a plurality of grounding system paths, and the purpose of centralized monitoring is achieved.
The above embodiment numbers of the present invention are only for description, and do not represent the advantages and disadvantages of the embodiments.
In the above embodiments of the present invention, the descriptions of the respective embodiments have respective emphasis, and for parts that are not described in detail in a certain embodiment, reference may be made to the related descriptions of other embodiments.
The foregoing is only a preferred embodiment of the present invention, and it should be noted that, for those skilled in the art, a plurality of modifications and decorations can be made without departing from the principle of the present invention, and these modifications and decorations should also be regarded as the protection scope of the present invention.
Claims (10)
1. A system for detecting a resistance parameter of a grounding system, comprising:
the driving electrodes are connected with the current output end of the monitor, arranged on a plurality of road sections of a grounding system path and used for outputting driving current to the road sections, wherein the grounding system path at least comprises a grounded device, a grounding body and a down lead for connecting the grounded device and the grounding body;
the induction electrodes and the driving electrodes are arranged on the road sections in pairs and are used for detecting response voltages generated by the road sections;
the current sensing device is connected with the current acquisition input end of the monitor, sleeved on the down lead and used for sensing the response current flowing through the down lead;
and the monitor is used for determining the resistance parameter of the grounding system path according to the driving current, the response voltage and the response current.
2. The system according to claim 1, wherein if the grounded device has a support member and/or an external attachment, the grounding path of the grounded device comprises three branches, a first branch being the grounding system path to earth through the down conductor, the grounding body, a second branch being the path directly to earth through the down conductor, and a third branch being the path to earth through the support member and/or the external attachment.
3. The system of claim 1, wherein the drive electrodes comprise at least a first drive electrode, a second drive electrode, and a third drive electrode, and the sense electrodes comprise at least a first sense electrode, a second sense electrode, and a third sense electrode, wherein,
the first driving electrode and the first sensing electrode are arranged at a conductive part of the grounded device;
the second driving electrode and the second induction electrode are arranged on the grounding system path at a preset distance from the grounding body;
the third induction electrode and the third driving electrode are arranged under the ground and are sequentially arranged on an extension line of a line segment determined by the grounding device and the grounding body, wherein the third induction electrode is positioned outside a scattered electric field of the third driving electrode and the grounding body.
4. The system of claim 3, wherein the third sensing electrode is at a horizontal distance of 20 meters from the ground body and the third driving electrode is at a horizontal distance of 40 meters from the ground body.
5. The system of claim 3, wherein the first drive electrode, the second drive electrode, the first sense electrode, and the second sense electrode are round cold-pressed terminals made of brass or copper.
6. The system of claim 3, wherein the third driving electrode and the third sensing electrode are rod-shaped metal electrodes having a rust-proof function.
7. The system of claim 3, wherein the current sensing device is sleeved on a down-lead between the second driving electrode/second sensing electrode to the grounding body; or the current sensing device is sleeved on a down lead between the grounded device and the second driving electrode/the second sensing electrode.
8. The system of claim 1, wherein the monitor comprises a display.
9. The system of claim 1, wherein the monitor further comprises a wired communication module and/or a wireless communication module.
10. A monitoring net, comprising:
at least one system for detecting a resistance parameter of the grounding system of any one of claims 1 to 9;
and the monitoring network host is connected with the monitors in the detection systems in a wired communication or wireless communication mode, and is used for sending setting parameters and monitoring instructions to the monitors and receiving resistance parameters from the monitors.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110261680A (en) * | 2019-07-08 | 2019-09-20 | 金茂联合(北京)科技发展有限公司 | Detection method, device, system and the monitoring network of earthed system resistance parameter |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110261680A (en) * | 2019-07-08 | 2019-09-20 | 金茂联合(北京)科技发展有限公司 | Detection method, device, system and the monitoring network of earthed system resistance parameter |
| WO2021004282A1 (en) * | 2019-07-08 | 2021-01-14 | 金茂联合(北京)科技发展有限公司 | Method, apparatus and system for measuring resistance parameter of grounding system, and monitoring network |
| US11719731B2 (en) | 2019-07-08 | 2023-08-08 | Kingmore Union (Beijing) Science & Technology Development Co., Ltd. | Method, apparatus and system for measuring resistance parameter of grounding system, and monitoring network |
| CN110261680B (en) * | 2019-07-08 | 2024-04-12 | 金茂联合(北京)科技发展有限公司 | Method, device and system for detecting resistance parameters of grounding system and monitoring network |
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