CN213337816U - Ground resistance detection device - Google Patents
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- CN213337816U CN213337816U CN202021422238.0U CN202021422238U CN213337816U CN 213337816 U CN213337816 U CN 213337816U CN 202021422238 U CN202021422238 U CN 202021422238U CN 213337816 U CN213337816 U CN 213337816U
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Abstract
The utility model discloses a ground resistance detection device belongs to the lightning protection device field. The utility model discloses a handheld single-point detection ground resistance's among the correlation technique device improves to multi-point detection device, can detect the ground resistance of a plurality of ground points near the building that awaits measuring simultaneously. The device for detecting the ground resistance by a single point does not need to be held by a technician to rush in a building to be detected, so that the ground resistance detection efficiency is improved. And simultaneously, through the utility model provides an earth resistance detection device can also the earth resistance of real-time detection building, has shortened earth resistance's detection cycle, has further improved the efficiency that earth resistance detected.
Description
Technical Field
The utility model relates to a lightning protection device field, in particular to ground resistance detection device.
Background
To avoid and reduce lightning damage, technicians typically set up lightning protection equipment according to technical standards. In order to ensure that the lightning protection facilities are complete and effective, technicians can carry out lightning protection detection at least twice each year. However, such periodic detection cannot completely ensure that the lightning protection facility is in a good condition in real time, and the lightning protection facility often fails due to environmental influences, production operation and maintenance, damage of a third party and the like.
In the related art, a technician may use a handheld single-point resistance detection device to detect the ground resistance of a building, and determine whether the building can effectively prevent lightning strikes.
However, when the ground resistance of the building is detected by the handheld single-point resistance detection device, technicians are required to change the detection points for many times, the cost of ground resistance detection is high, and the detection efficiency is low.
Disclosure of Invention
The embodiment of the utility model provides a ground resistance detection device can reduce the cost that ground resistance detected, improves the efficiency that detects. The technical scheme is as follows:
in one aspect, a ground resistance detection apparatus is provided, the apparatus including:
the device comprises a resistance detector (1), a power supply (2), at least two grounding grids to be detected (3) and an auxiliary grounding grid (4);
the first end of the to-be-tested ground net (3) is connected with a grounding point of a to-be-tested building (5), and the second end of the to-be-tested ground net (3) is connected with the first end of the resistance detector (1);
the first end of the auxiliary grounding grid (4) is connected with the second end of the resistance detector (1), and the second end of the auxiliary grounding grid (4) is grounded;
the power supply (2) is connected with the third end of the resistance detector (1);
the resistance detector (1) is used for outputting the grounding resistance of the building (5) to be detected according to signals obtained from the power supply (2), the grounding grid (3) to be detected and the auxiliary grounding grid (4).
In one possible design, the device further comprises at least two relays (6);
the first end of the relay (6) is connected with the second end of the grounding grid (3) to be detected, and the first end of the grounding grid (3) to be detected is connected with the first end of the resistance detector (1) through the second end of the relay (6).
In one possible design, the device further comprises a controller (7);
and the first end of the controller (7) is connected with the third end of the relay (6), and the controller (7) is used for controlling the connection and disconnection between the first end and the second end of the relay (6).
In one possible design, the controller (7) is connected to a fourth terminal of the resistance detector (1), and the resistance detector (1) is capable of sending the ground resistance of the building (5) to be tested to the controller (7).
In one possible embodiment, the controller (7) is a programmable logic controller.
In one possible design, the auxiliary counterpoise (4) comprises a first auxiliary counterpoise (41) and a second auxiliary counterpoise (42);
a first end of the first auxiliary grounding grid (41) is connected with a second end of the resistance detector (1), and a second end of the first auxiliary grounding grid (41) is grounded;
the first end of the second auxiliary grounding grid (42) is connected with the second end of the resistance detector (1), and the second end of the second auxiliary grounding grid (42) is grounded.
In one possible design, a first end of the first auxiliary ground grid (41) is connected with a first end of an ammeter, and a first end of the first auxiliary ground grid (41) is connected with a second end of the resistance detector (1) through a second end of the ammeter;
the first end of the second auxiliary grounding grid (42) is connected with the first end of the voltmeter, and the first end of the second auxiliary grounding grid (42) is connected with the second end of the resistance detector (1) through the second end of the voltmeter.
In one possible embodiment, the distance between the auxiliary ground screen (4) and the building (5) to be tested is determined as a function of the diagonal distance of the building (5) to be tested.
In one possible embodiment, the resistance detector (1) is arranged outside an explosion-proof area, which is an area in which explosive gases may be present during operation of the ground resistance detection device.
In one possible design, the individual parts of the resistance detector (1) are connected by RS486 cables.
The utility model discloses a hand-held single-point detection ground resistance's among the correlation technique device improves to multi-point detection device, can detect the ground resistance of a plurality of ground points near the building that awaits measuring simultaneously. The device for detecting the ground resistance by a single point does not need to be held by a technician to rush in a building to be detected, so that the ground resistance detection efficiency is improved. And simultaneously, through the utility model provides an earth resistance detection device can also the earth resistance of real-time detection building, has shortened earth resistance's detection cycle, has further improved the efficiency that earth resistance detected.
Drawings
In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings needed to be used in the description of the embodiments will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings without creative efforts.
Fig. 1 is a schematic structural diagram of a ground resistance detection system according to an embodiment of the present invention;
fig. 2 is a schematic structural diagram of a ground resistance detection device according to an embodiment of the present invention;
fig. 3 is a schematic view illustrating a setting effect of a ground screen to be tested according to an embodiment of the present invention;
fig. 4 is a circuit diagram provided by an embodiment of the present invention;
fig. 5 is a circuit diagram provided by an embodiment of the present invention;
fig. 6 is a schematic diagram of a connection between a relay and a ground grid to be tested according to an embodiment of the present invention;
fig. 7 is a circuit diagram according to an embodiment of the present invention.
Reference numerals: 1. a resistance detector; 2. a power source; 3. a ground screen to be tested; 4. an auxiliary counterpoise; 41. a first auxiliary counterpoise; 42. a second auxiliary counterpoise; 5. a building to be tested; 6. a relay; 7. and a controller.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention clearer, embodiments of the present invention will be described in further detail below with reference to the accompanying drawings.
It is at first right the utility model provides an earth resistance detection device's use scene explains, see fig. 1, the utility model provides an earth resistance detection device can use in earth resistance detection system 100. Ground resistance detecting system 100 includes on-the-spot collection module 101, communication module 102 and intelligent monitoring module 103, the utility model provides a ground resistance detection device can use in on-the-spot collection module 101. That is, when the ground resistance detecting system 100 normally operates, can pass through the utility model provides a ground resistance detecting device gathers the ground resistance of the building 5 that awaits measuring. The utility model provides a ground resistance detection device can send the ground resistance of the building 5 that awaits measuring to intelligent monitoring module 103 through communication module 102 after obtaining the ground resistance of the building 5 that awaits measuring. The intelligent monitoring module 103 can record the ground resistance of different ground points of one building 5 to be tested at different times, and also can record the ground resistance of different ground points of a plurality of buildings 5 to be tested, and technicians can obtain the ground resistance of different buildings 5 to be tested through the intelligent monitoring module 103, so that the abnormal conditions can be timely processed.
The utility model provides a ground resistance detection device can use in the higher production scene of danger coefficient such as oil gas field exploitation, also can use in life scenes such as resident's building and commercial building. Certainly, if extreme weather such as thunderstorm appears in the self-heating environment that a building was located often, then the utility model provides a ground resistance detection device also can provide more timely ground resistance information for it, makes things convenient for relevant personnel in time to obtain the safe condition of building.
The structure of the ground resistance detecting device provided by the present invention is explained below, referring to fig. 2, fig. 2 illustrates a schematic structural diagram of a ground resistance detecting device according to an embodiment of the present invention. As shown in fig. 2, the grounding resistance detection device includes a resistance detector 1, a power supply 2, at least two grounding grids 3 to be detected, and an auxiliary grounding grid 4; the first end of the to-be-detected ground net 3 is connected with a grounding point of the to-be-detected building 5, and the second end of the to-be-detected ground net 3 is connected with the first end of the resistance detector 1; the first end of the auxiliary ground net 4 is connected with the second end of the resistance detector 1, and the second end of the auxiliary ground net 4 is grounded; the power supply 2 is connected with the third end of the resistance detector 1; the resistance detector 1 is used for outputting the grounding resistance of the building 5 to be tested according to the signals obtained from the grounding grid 3 to be tested and the auxiliary grounding grid 4.
The grounding grid is a net-shaped grounding device which is composed of vertical and horizontal grounding bodies and has the functions of current leakage and voltage sharing, and the grounding body is a metal conductor which is buried in soil and directly contacts with the ground. The lightning rod of the building 5 to be tested can be connected with the ground net, and when lightning strikes, the energy of the lightning strikes can be conducted to the ground through the ground net, so that the damage of the lightning strikes to the building to be tested is avoided. The ground net connected with the building 5 to be tested is called the ground net 3 to be tested. The earth screens 3 to be tested can be arranged at different positions around the building 5 to be tested, and each earth screen 3 to be tested is connected with one earth point of the building 5 to be tested. Referring to fig. 3, taking the number of the ground nets 3 to be tested as 6 as an example, the 6 ground nets 3 to be tested can be arranged around the building 5 to be tested.
The following explains the operation principle of the ground resistance detection device:
in one possible design, the resistance detector 1 is capable of measuring its internal resistance r and a voltage U across the internal resistance r, and the power supply 2 is configured to supply the voltage U to the resistance detector 1. Since the second end of the resistance detector 1 is connected to the first end of the auxiliary ground net 4 and the second end of the auxiliary ground net 4 is grounded, the electromotive force of the second end of the resistance detector 1 can be regarded as 0, and thus a current I from the building to be tested 5 → the ground net to be tested 3 → the ground resistance detector 1 can be generated in the ground resistance detection apparatus. Referring to the circuit diagram shown in fig. 4, the resistance detector 1 can determine the current I in the ground resistance detection device as u/r according to its internal resistance r and the voltage u across the internal resistance r. The resistance detector 1 can obtain the voltage drop (U-U) of the current flowing through the building 5 to be measured according to the power supply voltage U and the voltage U at the two ends of the internal resistance r. The resistance detector 1 can obtain the grounding resistance R of the building 5 to be detected as [ (U-U)/I ] according to the voltage drop (U-U) of the current flowing through the building 5 to be detected and the current I in the grounding resistance detection device, wherein the unit of R and R is ohm (omega), the unit of U and U is volt (V), and the unit of I is ampere (I).
Additionally, because the utility model provides an earth resistance detection device includes two at least meshes 3 that await measuring, and resistance detector 1 can obtain the earth resistance of 5 different positions of the building that await measuring according to the different information that await measuring meshes 3.
Under this kind of design, the technical staff need not to hold the ground resistance that manual single-point detection device detected the different positions of the building that awaits measuring, but can pass through the utility model provides a ground resistance detection device obtains the ground resistance of the different positions of the building that awaits measuring fast, and the speed that detects is faster, and efficiency is higher.
Taking the number of the ground nets 3 to be tested as 2 as an example, referring to fig. 5, two resistors r1 and r2 can be arranged in the resistance detector 1, and 2 ground nets 3 to be tested are respectively connected with the resistance detector 1 through the resistors r1 and r2, so that the resistance detector 1 can determine the ground resistance of the ground points connected with the 2 ground nets to be tested according to the resistance values of r1 and r2, the voltages at the two ends of r1 and r2 and the power supply voltage.
In one possible design, the ground resistance detection device further comprises at least two relays 6. The first end of relay 6 links to each other with the second end of the earth mat 3 that awaits measuring, and the first end of the earth mat 3 that awaits measuring passes through the second end of relay 6 and links to each other with the first end of resistance detector 1.
Under the design, a technician can quickly indicate the resistance detector 1 through the relay 6 to detect the grounding resistance of different grounding points of the building to be detected, the internal resistance does not need to be set in the resistance detector 1 according to the number of grounding nets to be detected, and the technician does not need to rush in the building to be detected to measure, so that the detection efficiency of the grounding resistance is improved.
That is, a relay 6 is provided between the ground grid 3 to be tested and the resistance detector 1, and a technician can control the on and off of the relay 6 to control which ground point the resistance detector 1 detects the ground resistance. Taking the number of the grounding grids 3 to be tested as 2 as an example, a relay 6 is arranged between each grounding grid 3 to be tested and the resistance detector 1. The technician can control the grounding point detected by the resistance detector 1 by closing and opening the relay 6. Referring to fig. 6, the system comprises a first to-be-tested ground net 31 and a second to-be-tested ground net 32, a first end of the first to-be-tested ground net 31 is connected with a first grounding point of a to-be-tested building, and a first end of the second to-be-tested ground net 32 is connected with a second grounding point of the to-be-tested building. The second end of the first ground network to be tested 31 is connected to the first end of the first relay 61, and the second end of the first relay 61 is connected to the first end of the resistance detector 1. The second end of the second ground network to be tested 32 is connected to the first end of the second relay 62, and the second end of the second relay 62 is connected to the first end of the resistance detector 1. When the technician needs to detect the ground resistance of the first ground point by the resistance detector 1, it can be realized by closing the first relay 61 and opening the second relay 62. When the technician needs to detect the ground resistance of the second ground point by the resistance detector 1, it can be realized by closing the second relay 62 and opening the first relay 61.
In a possible design, the ground resistance detection device further includes a controller 7 in addition to the at least two relays 6, a first end of the controller 7 is connected to a third end of the relays 6, and the controller 7 is used for controlling connection and disconnection between the first end and the second end of the relays 6. Optionally, the controller 7 comprises a processor and a memory, and the controller 7 can trigger different control instructions for controlling different relays to be closed or opened according to the operation of a technician.
Under the design, the controller 7 can control the on and off of at least two relays 6, when the ground resistance of any grounding point of a building to be detected needs to be detected through the resistance detector 1, a technician can close the relay 6 connected with the grounding point through the controller 7 and open the relays 6 connected with other grounding points, so that the resistance detector 1 can detect the ground resistance of the grounding point, the technician does not need to manually close or open the relays 6, and the detection efficiency of the ground resistance is higher.
For example, the Controller 7 is a Programmable Logic Controller (PLC). The technician can perform various applications through the PLC, such as setting the frequency of detecting the ground resistance through the PLC or setting the sequence of the turn-on and turn-off of the relay 6 during the ground resistance detection process. The frequency of detecting the ground resistance by the PLC setting is described below by way of example 1, and the sequence of turning on and off the relay 6 during the detection of the ground resistance by the PLC setting is described below by way of example 2.
In example 1, a technician can set the detection frequency of the ground resistor on the PLC, for example, the detection frequency is set to be 3 times per day, and the interval is 8 hours each time, then the PLC controls at least two relays to be closed every 8 hours, and the resistance detector 1 can obtain the ground resistor of the building 5 to be detected every 8 hours.
Example 2, if the ground resistance detection device includes 6 to-be-detected ground nets 3 shown in fig. 2 and 6 relays 6 respectively connected to the 6 to-be-detected ground nets, then in the detection process of the sequential ground resistance, the PLC can sequentially close the 6 relays 6 in a sequence from left to right by executing a target program, and when a new relay 6 is closed, the relay 6 closed before the PLC controls to be open, that is, in the detection process of the sequential ground resistance, the relay 6 is closed when there is and only one relay 6.
Of course, the two examples are described by taking the PLC to control the detection frequency and the detection sequence of the ground resistor as examples, in other possible embodiments, the PLC can also control the detection frequency and the detection sequence of the ground resistor simultaneously, for example, the detection frequency is set to be 3 times per day, each time interval is 8 hours, the detection sequence is that 6 grounding grids to be detected as shown in fig. 2 are detected from left to right in sequence, and then the PLC can control 6 relays 6 to be closed in sequence every 8 hours, so as to obtain the ground resistor of the grounding point connected to the 6 grounding grids to be detected 3.
In addition, the controller can be other devices with data processing and data storage functions, such as a single chip microcomputer, besides the PLC, which is not limited by the embodiment of the present invention.
In one possible design, the controller 7 is connected to the fourth terminal of the resistance detector 1, and the resistance detector 1 is capable of sending the ground resistance of the building 5 to be tested to the controller 7.
In this implementation manner, the controller 7 can store the ground resistance of the building 5 to be tested, which is sent by the resistance detector 1, without manually recording the ground resistance of the building 5 to be tested by a technician, so that the subsequent technician can conveniently check the ground resistance.
For example, the resistance detector 1 can send the ground resistance to the controller 7 after detecting the ground resistance of the building 5 to be detected, and the controller 7 sets a timestamp for the received ground resistance and an identifier of the building 5 to be detected. Of course, if the controller 7 is a PLC, the controller 7 can also set the identification of the grounding point of the building to be tested for different grounding resistances according to the sequence of receiving the grounding resistances, so that the technician can determine the grounding points of different buildings to be tested through the identification of the grounding point of the building. When the grounding resistance of any grounding point of the building to be tested is abnormal, a technician can determine the position and time of the abnormal position in time, so that manual intervention is carried out, and faults are eliminated. If the grounding resistance detection device comprises 6 grounding grids to be detected as shown in fig. 2, the PLC can record the received grounding resistance in the form of table 1. The technical personnel can determine the record of the grounding resistance of the building 5 to be tested on the date through the date and the identification of the building 5 to be tested, and can quickly know whether the grounding resistance of each grounding point of the building 5 to be tested is normal or not through the record.
TABLE 1
In a possible design, the auxiliary counterpoise 4 comprises a first auxiliary counterpoise 41 and a second auxiliary counterpoise 42. A first terminal of the first auxiliary counterpoise 41 is connected to a second terminal of the resistance detector 1, and a second terminal of the first auxiliary counterpoise 41 is grounded. A first terminal of the second auxiliary counterpoise 42 is connected to a second terminal of the resistance detector 1, and a second terminal of the second auxiliary counterpoise 42 is grounded. The burying distance of the first auxiliary ground net 41 and the second auxiliary ground net 42 in the soil can be determined according to the actual condition of the soil, for example, the first auxiliary ground net 41 and the second auxiliary ground net 42 are buried at a depth of 1.5m below the ground surface, which is not limited by the embodiment of the present invention.
In this implementation, the resistance detector 1 can detect the ground resistance of the building to be detected by using a "three-pole method", that is, the ground network 3 to be detected, the first auxiliary ground network 41 and the second auxiliary ground network 42, and the ground resistance obtained by using the "three-pole method" is more accurate.
For example, a first terminal of the first auxiliary ground grid 41 is connected to a first terminal of the ammeter a, and the first terminal of the first auxiliary ground grid 41 is connected to a second terminal of the resistance detector 1 through a second terminal of the ammeter a. A first terminal of the second auxiliary ground network 42 is connected to a first terminal of the voltmeter V, and the first terminal of the second auxiliary ground network 42 is connected to a second terminal of the resistance detector 1 through a second terminal of the voltmeter V.
The following description will be made in conjunction with the circuit diagram of the ground resistance detecting device provided by the present invention, which adopts a "three-pole method" to measure the ground resistance of the building to be tested:
referring to fig. 7, the circuit includes a power supply 2, a ground grid 3 to be measured, a first auxiliary ground grid 41 and a second auxiliary ground grid 42, the first auxiliary ground grid 41 is directly connected to the ground grid 3 to be measured, a first end of the second auxiliary ground grid 42 is connected to the power supply, second ends of the first auxiliary ground grid 41 and the second auxiliary ground grid 42 are both grounded, it should be noted that the connection relationship of the above parts is realized by the layout of internal routing of the resistance detector 1, and the resistance detector 1 can obtain the indication numbers of the voltmeter V and the ammeter a. Before detecting the grounding resistance of the building to be tested, the technician can determine the setting position of the first auxiliary grounding grid 14 by moving the first electrode, wherein the first electrode held by the technician is the electrode connected with the voltmeter. The technician brings the first electrode into vertical contact with the ground, moves the first electrode on the ground, and determines the potential difference between the first electrode and the ground screen 3 to be measured through the voltmeter. In response to that the difference between the potential difference between the first electrode and the to-be-detected grounding grid 3, which is displayed by the voltmeter, is smaller than or equal to the target threshold when the first electrode is moved, a technician can move the position of the first electrode to the midpoint between the current position and the last moving position to serve as the setting position of the first auxiliary grounding grid 41, so that the wiring position of the first auxiliary grounding grid 41 can be guaranteed to be 0 potential, the accuracy of subsequent detection is improved, after the position of the first auxiliary grounding grid 41 is determined, the technician can bury the first auxiliary grounding grid 41 below the position, and the first auxiliary grounding grid 41 is connected with the resistance detector 1 through the voltmeter and by a cable. According to ohm's theorem, the resistance detector 1 can use the ratio of the voltmeter V to the ammeter a as the ground resistance of a ground point of the building 5 to be tested.
In one possible embodiment, the distance between auxiliary ground screen 4 and building 5 to be tested is determined as a function of the diagonal distance of building 5 to be tested.
For example, when the technician sets the auxiliary grounding grid 4, the distance between the auxiliary grounding grid 4 and the building 5 to be tested can be determined according to the maximum diagonal length of the building 5 to be tested, so that the potential of the auxiliary grounding grid 4 can be ensured to be as close to 0 as possible, and the obtained detection result of the grounding resistance is more accurate. If the auxiliary ground net 4 includes the first auxiliary ground net 41 and the second auxiliary ground net 42, the maximum diagonal length of the building 5 to be tested is denoted as D, the distance between the first auxiliary ground net 41 and the building 5 to be tested is denoted as D1, and the distance between the second auxiliary ground net 42 and the building 5 to be tested is denoted as D2, then D, D1 and D2 approximately satisfy formula (1).
d2＝(4～5)D
d1＝(0.5～0.6)d2 (1)
This can ensure that the potentials of the first auxiliary ground grid 41 and the second auxiliary ground grid 42 are as low as possible, and improve the accuracy of the ground resistance obtained by the ground resistance detection device.
In addition, the technician can also determine the distance between the auxiliary ground net 4 and the building 5 to be tested according to the floor area of the building 5 to be tested and the resistivity of the soil, and if the floor area of the building to be tested is large, for example, larger than 1000m2When the resistivity difference of the adjacent soil is large, the technician can increase the distance between the auxiliary ground net 4 and the building 5 to be measured.
In one possible design, the resistance detector 1 is arranged outside an explosion-proof area, which is an area where explosive gases may be present when the ground resistance detection device is in operation.
Under this kind of design, when ground resistance detection device was applied to in the oil gas exploitation environment, because the exploitation of oil gas can produce flammable and explosive gas, the technical staff can set up resistance detector 1 in the outside in explosion-proof district, of course, except with resistance detector 1, the technical staff also can set up power 2, relay 6 and controller 7 in the outside in explosion-proof district, can guarantee ground resistance detection device's security like this.
In one possible design, the various parts of the resistance detector 1 are connected by RS486 cables.
Because the RS486 cable has good stability and high reliability of information transmission, the RS486 cable is used for connecting all parts in the grounding resistance detection device, and the stability of the grounding resistance detection can be improved on the whole. Certainly, along with scientific and technological development, also can adopt other better cables of stability, the embodiment of the utility model provides a do not limit to this.
The utility model discloses a hand-held single-point detection ground resistance's among the correlation technique device improves to multi-point detection device, can detect the ground resistance of a plurality of ground points near the building that awaits measuring simultaneously. The device for detecting the ground resistance by a single point does not need to be held by a technician to rush in a building to be detected, so that the ground resistance detection efficiency is improved. And simultaneously, through the utility model provides an earth resistance detection device can also the earth resistance of real-time detection building, has shortened earth resistance's detection cycle, has further improved the efficiency that earth resistance detected.
Above-mentioned all optional technical scheme can adopt arbitrary combination to form the optional embodiment of this utility model, and the repeated description is no longer given here.
The above description is only an alternative embodiment of the present invention, and is not intended to limit the present invention, and any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention should be included within the protection scope of the present invention.
Claims (10)
1. An earth resistance detection device, comprising: the device comprises a resistance detector (1), a power supply (2), at least two grounding grids to be detected (3) and an auxiliary grounding grid (4);
the first end of the to-be-tested ground net (3) is connected with a grounding point of a to-be-tested building (5), and the second end of the to-be-tested ground net (3) is connected with the first end of the resistance detector (1);
the first end of the auxiliary grounding grid (4) is connected with the second end of the resistance detector (1), and the second end of the auxiliary grounding grid (4) is grounded;
the power supply (2) is connected with the third end of the resistance detector (1);
the resistance detector (1) is used for outputting the grounding resistance of the building (5) to be detected according to signals obtained from the power supply (2), the grounding grid (3) to be detected and the auxiliary grounding grid (4).
2. The ground resistance detection device according to claim 1, characterized in that the device further comprises at least two relays (6);
the first end of the relay (6) is connected with the second end of the grounding grid (3) to be detected, and the first end of the grounding grid (3) to be detected is connected with the first end of the resistance detector (1) through the second end of the relay (6).
3. The ground resistance detection device according to claim 2, characterized in that the device further comprises a controller (7);
and the first end of the controller (7) is connected with the third end of the relay (6), and the controller (7) is used for controlling the connection and disconnection between the first end and the second end of the relay (6).
4. The ground resistance detection device according to claim 3, characterized in that the controller (7) is connected to the fourth terminal of the resistance detector (1), the resistance detector (1) being able to send the ground resistance of the building (5) to be tested to the controller (7).
5. A ground resistance detection device according to claim 3, characterized in that the controller (7) is a programmable logic controller.
6. Ground resistance detection device according to claim 1, characterized in that the auxiliary counterpoise (4) comprises a first auxiliary counterpoise (41) and a second auxiliary counterpoise (42);
a first end of the first auxiliary grounding grid (41) is connected with a second end of the resistance detector (1), and a second end of the first auxiliary grounding grid (41) is grounded;
the first end of the second auxiliary grounding grid (42) is connected with the second end of the resistance detector (1), and the second end of the second auxiliary grounding grid (42) is grounded.
7. The ground resistance detection device according to claim 6, characterized in that a first end of the first auxiliary ground net (41) is connected with a first end of an ammeter, and a first end of the first auxiliary ground net (41) is connected with a second end of the resistance detector (1) through a second end of the ammeter;
the first end of the second auxiliary grounding grid (42) is connected with the first end of the voltmeter, and the first end of the second auxiliary grounding grid (42) is connected with the second end of the resistance detector (1) through the second end of the voltmeter.
8. The grounding resistance detection device according to claim 1, characterized in that the distance between the auxiliary grounding grid (4) and the building (5) to be tested is determined according to the diagonal distance of the building (5) to be tested.
9. The ground resistance detecting device according to claim 1, characterized in that the resistance detector (1) is arranged outside an explosion-proof area, which is an area where explosive gas may be present when the ground resistance detecting device is operated.
10. A ground resistance tester as claimed in claim 1, characterized in that the parts of the resistance tester (1) are connected by RS486 cable.
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