CN215641513U - Grounding grid grounding resistance test system based on GPS - Google Patents
Grounding grid grounding resistance test system based on GPS Download PDFInfo
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- CN215641513U CN215641513U CN202022225645.9U CN202022225645U CN215641513U CN 215641513 U CN215641513 U CN 215641513U CN 202022225645 U CN202022225645 U CN 202022225645U CN 215641513 U CN215641513 U CN 215641513U
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Abstract
A ground net ground resistance test system based on GPS, the system includes: the device comprises a grounding resistance measuring instrument, a connecting cable, a current grounding electrode, a voltage grounding electrode, a GPS/Beidou positioning instrument and a grounding resistance correction module; the grounding resistance measuring instrument is used for generating set testing voltage and testing current to obtain apparent grounding impedance; the GPS \ Beidou positioning instrument comprises: the system comprises an input module, an output module, a control and data processing module, a GPS/Beidou dual-mode positioning module and a wireless communication module; the ground resistance correction module obtains a ground resistance correction value. The utility model can cover the ground grid test requirements of each large-scale transformer substation, and test operators can select any GPS/Beidou positioning instrument to calculate the distance between the current grounding electrode and the grounding grid grounding electrode, the distance between the voltage grounding electrode and the grounding grid grounding electrode and the included angle between a current line and a voltage line, thereby realizing the standardization and the precision of the ground grid grounding resistance test.
Description
Technical Field
The utility model belongs to the technical field of power system grounding, and particularly relates to a GPS-based grounding network grounding resistance test system for mountain areas.
Background
The ground classification of the power system includes a working ground, a protective ground, and a lightning protection ground. The grounding is required to operate in a power system, such as the direct grounding of a neutral point or the grounding through other devices; (2) the protection grounding is also called safe grounding, and the metal shell of an electrical device, the framework of a power distribution device, a line tower and the like are possible to be electrified due to insulation damage, so that the grounding is arranged for preventing the safety of people and equipment from being endangered; (3) the lightning protection grounding is grounding which is arranged for lightning protection devices, such as lightning rods, lightning wires, lightning arresters and the like to release lightning current to the ground; (4) and (4) electrostatic grounding. The grounding is used for releasing electrostatic charges existing in the equipment shell in an electric field and preventing danger caused by excessive static electricity or electrostatic ignition.
In the prior art, the traditional methods for measuring the pay-off distance mainly comprise an artificial walking measurement method and an infrared distance measurement method. The manual measurement is difficult to ensure that the distance between the voltage pole and the current pole is difficult to ensure, and the reference point of the ground grid, the current pole and the voltage pole are on the same straight line, so that the precision error is large. The infrared distance meter needs a fixed and high reference point, otherwise, the distance measurement is difficult to locate, and the practical application is extremely inconvenient. At present, a mobile phone is used for analog positioning, but for a power grid system with a plurality of transformer substations distributed in mountainous regions, signals are poor, positioning errors of the mobile phone are achieved, and linear distances of a current pole and a voltage pole cannot be calculated and displayed in real time. In areas with mountainous areas as the main part, the surrounding geographical environment of the transformer substation is complex, and the position of the electrode is determined according to the paying-off length and manual ranging, so that the test result has large deviation.
SUMMERY OF THE UTILITY MODEL
In order to solve the defects in the prior art, the utility model aims to provide a grounding grid grounding resistance testing system based on a GPS (global positioning system), which covers the requirement of testing the grounding grid of each large-scale substation, and a test operator can select any GPS/Beidou positioning instrument to calculate the distance between a current grounding electrode and a grounding grid grounding electrode, the distance between a voltage grounding electrode and a grounding grid grounding electrode and the included angle between a current line and a voltage line, so that the standardization and the precision of the grounding grid grounding resistance test are realized.
The utility model adopts the following technical scheme. A grounding grid grounding resistance test system based on GPS comprises: the device comprises a grounding resistance measuring instrument, a connecting cable, a current grounding electrode, a voltage grounding electrode, a GPS/Beidou positioning instrument and a grounding resistance correction module; the grounding resistance measuring instrument which generates set test voltage and test current to obtain apparent grounding impedance is connected with the current grounding electrode, the voltage grounding electrode and the grounding grid grounding electrode through connecting cables; the GPS \ Beidou positioning instrument comprises: the device comprises an input module, an output module, a control and data processing module, a GPS/Beidou dual-mode positioning module, a power supply module and a wireless communication module; the GPS/Beidou dual-mode positioning module is connected with the control and data processing module which calculates the distance between the current grounding electrode and the grounding grid grounding electrode, the distance between the voltage grounding electrode and the grounding grid grounding electrode, the distance between the current grounding electrode and the voltage grounding electrode and the included angle between a current line and a voltage line, the control and data processing module is connected with the wireless communication module which transmits data between the GPS/Beidou positioning instrument, and the control and data processing module is also connected with the input module and the output module respectively; the grounding resistance correction module corrects the apparent grounding impedance according to the test voltage, the test current, the apparent grounding impedance, the distance between the current grounding electrode and the grounding grid grounding electrode, the distance between the voltage grounding electrode and the grounding grid grounding electrode, the distance between the current grounding electrode and the voltage grounding electrode and the included angle between a current line and a voltage line.
Preferably, the power supply module comprises a 12.6V/2600mAh battery unit, a switching power supply unit and a linear voltage stabilizing unit, and the output end outputs 5V working voltage and 3.3V working voltage.
Preferably, the control and data processing module and the GPS/Beidou dual-mode positioning module for acquiring the position information are both connected with the 3.3V output end of the power module.
Preferably, the position information of other GPS \ Beidou positioning instruments is received and sent to the control and data processing module, and the data of the control and data processing module is sent to the wireless communication modules of the other GPS \ Beidou positioning instruments and connected with the 5.5V output end of the power supply module.
Preferably, the GPS \ beidou dual-mode positioning module comprises: GPS \ big dipper antenna and GPS \ big dipper chip module, GPS \ big dipper antenna can independently receive GPS signal, big dipper signal.
Preferably, the GPS/Beidou dual-mode positioning module is shielded by an aluminum shell except for a GPS/Beidou antenna wire inlet hole in a closed mode.
Preferably, the GPS \ beidou antenna uses a 35mm × 35mm active square antenna.
Preferably, the ground net ground resistance test system further comprises: and the timing shutdown module is connected with the control and data processing module and is used for automatically shutting down after delaying the set time.
Preferably, the output module driven and controlled by the control and data processing module is a black-white dot matrix liquid crystal screen.
Preferably, the input module connected with the control and data processing module and used for interface operation of the black-and-white dot matrix liquid crystal screen is a keyboard.
The utility model has the advantages that compared with the prior art, the GPS positioner consists of the GPS module, the wireless transceiving module and the data processing module, has the characteristics of high positioning precision and long wireless transmission distance, can cover the ground grid test requirements of various large-scale substations, and can realize the standardization and the precision of the ground resistance test of the ground grid grounding grid by selecting any GPS/Beidou positioner to calculate the distance between the current grounding electrode and the grounding grid grounding electrode, the distance between the voltage grounding electrode and the grounding grid grounding electrode and the included angle between a current line and a voltage line by a test operator.
Drawings
FIG. 1 is a block diagram of a GPS-based ground net ground resistance test system of the present invention;
FIG. 2 is a flow chart of a method for testing grounding resistance of a grounding grid based on GPS according to the present invention.
In the figure:
1-an input module;
2-a control and data processing module;
3-an output module;
4-GPS \ Beidou dual-mode positioning module;
5-a wireless communication module;
6-3.3V output end;
7-5V output end;
8-power supply module.
Detailed Description
The present application is further described below with reference to the accompanying drawings. The following examples are only for illustrating the technical solutions of the present invention more clearly, and the protection scope of the present application is not limited thereby.
As shown in fig. 1, the present invention provides a system for testing ground resistance of a ground network based on GPS, comprising: the device comprises a grounding resistance measuring instrument, a connecting cable, a current grounding electrode, a voltage grounding electrode, a plurality of GPS/Beidou positioning instruments and a grounding resistance correction module.
The grounding resistance measuring instrument is connected with the current grounding electrode, the voltage grounding electrode and the grounding grid grounding electrode through connecting cables and used for generating set testing voltage and testing current to obtain apparent grounding impedance.
The GPS \ Beidou positioning instrument comprises: the system comprises an input module 1, an output module 3, a control and data processing module 2, a GPS \ Beidou dual-mode positioning module 4 and a wireless communication module 5, wherein the control and data processing module is respectively connected with the input module, the output module, the GPS \ Beidou dual-mode positioning module and the wireless communication module; the multiple GPS/Beidou positioning instruments are divided into a first group and a second group, the first group is used for current electrode ranging of grounding network grounding resistance testing, and the second group is used for voltage electrode ranging of grounding network grounding resistance testing; the first group and the second group are matched for obtaining an included angle between the current line and the voltage line. The first group of GPS/Beidou positioning instruments and the second group of GPS/Beidou positioning instruments do not distinguish main machines and can be freely arranged as required.
And the grounding resistance correction module corrects the apparent grounding impedance by using the test voltage, the test current, the apparent grounding impedance, the length of the current wire, the length of the voltage wire and the included angle between the current wire and the voltage wire to obtain a grounding resistance correction value.
The control and data processing module calculates and obtains the distance cg between the current grounding electrode and the grounding grid grounding electrode, the distance pg between the voltage grounding electrode and the grounding grid grounding electrode and the distance cp between the current grounding electrode and the voltage grounding electrode according to the following formula,
in the formula:
d represents the distance between two latitudes and longitudes,
r represents the radius of the earth and,
hav (-) represents a half positive loss function,
λ1the longitude of the first position is represented as,
λ2indicating the longitude of the second location.
The control and data processing module corrects the earth radius in the following formula,
r＝b+(a+b)·(90-N)
in the formula:
a represents an equatorial radius, a is 6378137m,
b represents a polar radius, b is 6356725m,
and N represents the latitude of the GPS/Beidou positioning instrument.
The control and data processing module calculates and obtains an included angle alpha between the current line and the voltage line according to the following formula,
in the formula:
cp represents the distance between the current ground and the voltage ground.
The grounding resistance correction module is used for correcting apparent grounding impedance Z according to the following formula0Correcting to obtain a ground impedance correction value Z,
in the formula:
d represents the diagonal length of the earth grid,
Z0representing the apparent ground impedance.
The GPS/Beidou positioning instrument further comprises a power supply module 8; the power module comprises a 12.6V/2600mAh battery unit, a switching power supply unit and a linear voltage stabilizing unit, the power module provides 5V working voltage for the wireless communication module through a 5V output end 7, and the linear voltage stabilizing unit provides 3.3V working voltage for the output module, the control and data processing module and the GPS/Beidou dual-mode positioning module through a 3.3V output end 6.
The output module is a black and white dot matrix liquid crystal screen and is driven and controlled by the control and data processing module, and the input module is a keyboard, is connected with the control and data processing module and is used for operating the interface of the black and white dot matrix liquid crystal screen.
The wireless communication module receives the position information of other GPS/Beidou positioning instruments, sends the position information to the control and data processing module, and sends the data of the control and data processing module to the other GPS/Beidou positioning instruments.
The GPS/Beidou dual-mode positioning module comprises a GPS/Beidou antenna and a GPS/Beidou chip module, wherein the GPS/Beidou antenna can independently receive GPS signals and Beidou signals to realize single GPS positioning, single Beidou positioning and GPS and Beidou dual positioning. The GPS/Beidou antenna adopts a 35mm active square antenna, the received signal strength reaches 42DB, and high-speed positioning of equipment can be realized. The GPS/Beidou chip module is connected with the control and data processing module through a TTL level and used for transmission of an NMEA protocol and configuration of the module.
The GPS/Beidou dual-mode positioning module is sealed and shielded by an aluminum shell except for a GPS/Beidou antenna wire inlet hole.
The grounding resistance test system of the grounding grid based on the GPS also comprises a timing shutdown module which is connected with the control and data processing module and is used for automatically shutting down after delaying the set time.
The wireless communication module is used for receiving longitude and latitude information of the other side and transmitting the longitude and latitude information to the central processing unit, or receiving instructions of the central processing unit and transmitting the instructions to other equipment. The wireless communication module sets specific transceiving frequency according to actual needs, and the transceiving frequency is set to be 2400K because the GPS/Beidou positioning instrument needs small data volume but requires long transmission distance, and lora spread spectrum modulation is performed.
In order to more clearly describe the GPS-based ground grid ground resistance test system, a test method using the GPS-based ground grid ground resistance test system is described below.
As shown in fig. 2, the present invention also provides a GPS-based ground network ground resistance testing method using the GPS-based ground network ground resistance testing system, comprising the steps of:
step 1, setting a current grounding electrode, a voltage grounding electrode, connecting a grounding resistance measuring instrument with the current grounding electrode, the voltage grounding electrode and a grounding grid grounding electrode, and representing the diagonal length of the grounding grid by D; and obtaining the position of the grounding electrode of the grounding grid by using any one group of GPS/Beidou positioning instruments.
Step 2, obtaining the position of a current grounding electrode by using a first group of GPS/Beidou positioning instruments, and further obtaining the distance between the current grounding electrode and a grounding grid grounding electrode, wherein the distance is expressed by cg; obtaining the position of a voltage grounding electrode by a second group of GPS/Beidou positioning instruments, and further obtaining the distance between the voltage grounding electrode and a grounding grid grounding electrode, wherein the distance is expressed by pg; the included angle between the current line and the voltage line is obtained by the first group of GPS/Beidou positioning instrument and the second group of GPS/Beidou positioning instrument and is expressed by alpha. More specifically, the present invention is to provide a novel,
in the step 2, the acquired longitude and latitude information ddmm.mmm composed of the latitude and the division is converted into a form dd.ddddd of the latitude, the difference value of the two longitudes is calculated, domestic use generally only relates to east longitude and north latitude, and the longitude and latitude information is expressed by radian.
In step 2, cg, pg and the distance cp between the current grounding electrode and the voltage grounding electrode are calculated and obtained according to the following formula,
in the formula:
d represents the distance between two latitudes and longitudes,
r represents the radius of the earth and,
hav (-) represents a half positive loss function,
λ1the longitude of the first position is represented as,
λ2indicating the longitude of the second location.
In step 2, the radius of the earth under the current latitude and longitude is calculated, the radius of the earth is 6378137m for an equatorial radius a, 6356725 for a polar radius b, 6371000m for an average radius, an error not more than 3 per thousand can exist in the actual using process of the average radius, in order to reduce the influence of the radius of the earth on the calculation result at different latitudes, the radius of the earth is corrected by the following formula,
r＝b+(a+b)·(90-N)
in the formula:
a represents an equatorial radius, a is 6378137m,
b represents a polar radius, b is 6356725m,
and N represents the latitude of the GPS/Beidou positioning instrument.
The angle alpha between the current line and the voltage line is calculated and obtained by the following formula,
in the formula:
cp represents the distance between the current ground and the voltage ground.
Step 4, apparent grounding impedance Z is measured according to the following formula0Correcting to obtain a ground impedance correction value Z,
and 5, changing cg, pg and alpha, repeating the steps 1 to 4 for a plurality of times, and obtaining a grounding resistance record table.
The utility model has the advantages that compared with the prior art, the GPS positioner consists of the GPS module, the wireless transceiving module and the data processing module, has the characteristics of high positioning precision and long wireless transmission distance, can cover the ground grid test requirements of various large-scale substations, and can realize the standardization and the precision of the ground resistance test of the ground grid grounding grid by selecting any GPS/Beidou positioner to calculate the distance between the current grounding electrode and the grounding grid grounding electrode, the distance between the voltage grounding electrode and the grounding grid grounding electrode and the included angle between a current line and a voltage line by a test operator.
The applicant has described and illustrated embodiments of the present invention in detail with reference to the drawings attached hereto, but it should be understood by those skilled in the art that the above embodiments are merely preferred embodiments of the present invention, and the detailed description is only for the purpose of helping the reader to better understand the spirit of the present invention, and not for limiting the scope of the present invention, and on the contrary, any improvement or modification made based on the spirit of the present invention should fall within the scope of the present invention.
Claims (9)
1. A grounding grid grounding resistance test system based on GPS comprises: the device comprises a grounding resistance measuring instrument, a connecting cable, a current grounding electrode, a voltage grounding electrode, a GPS/Beidou positioning instrument and a grounding resistance correction module; it is characterized in that the preparation method is characterized in that,
the grounding resistance measuring instrument which generates set test voltage and test current to obtain apparent grounding impedance is connected with the current grounding electrode, the voltage grounding electrode and the grounding grid grounding electrode through connecting cables;
the GPS \ Beidou positioning instrument comprises: the device comprises an input module (1), an output module (3), a control and data processing module (2), a GPS \ Beidou dual-mode positioning module (4), a power supply module (8) and a wireless communication module (5); the GPS/Beidou dual-mode positioning module is connected with the control and data processing module which calculates the distance between the current grounding electrode and the grounding grid grounding electrode, the distance between the voltage grounding electrode and the grounding grid grounding electrode, the distance between the current grounding electrode and the voltage grounding electrode and the included angle between a current line and a voltage line, the control and data processing module is connected with the wireless communication module which transmits data between the GPS/Beidou positioning instrument, and the control and data processing module is also connected with the input module and the output module respectively;
the grounding resistance correction module corrects the apparent grounding impedance according to the test voltage, the test current, the apparent grounding impedance, the distance between the current grounding electrode and the grounding grid grounding electrode, the distance between the voltage grounding electrode and the grounding grid grounding electrode, the distance between the current grounding electrode and the voltage grounding electrode and the included angle between a current line and a voltage line.
2. The GPS based ground net ground resistance test system of claim 1,
the power supply module comprises a 12.6V/2600mAh battery unit, a switching power supply unit and a linear voltage stabilizing unit, and the output end outputs 5V working voltage and 3.3V working voltage.
3. The GPS-based ground grid grounding resistance testing system of claim 2,
the control and data processing module and the GPS/Beidou dual-mode positioning module for collecting the position information are connected with the 3.3V output end (6) of the power supply module.
4. A GPS based ground net ground resistance test system according to any one of claims 1 to 3,
the GPS/Beidou dual-mode positioning module comprises: GPS \ big dipper antenna and GPS \ big dipper chip module, GPS \ big dipper antenna can independently receive GPS signal, big dipper signal.
5. The GPS based ground net ground resistance test system of claim 4,
the GPS/Beidou dual-mode positioning module is sealed and shielded by an aluminum shell except for a GPS/Beidou antenna wire inlet hole.
6. The GPS based ground net ground resistance test system of claim 4,
the GPS \ Beidou antenna adopts a 35mm × 35mm active square antenna.
7. A GPS based ground net ground resistance test system according to any one of claims 1 to 3,
grounding network ground resistance test system still includes: and the timing shutdown module is connected with the control and data processing module and is used for automatically shutting down after delaying the set time.
8. A GPS based ground net ground resistance test system according to any one of claims 1 to 3,
the output module driven and controlled by the control and data processing module is a black-white lattice liquid crystal screen.
9. The GPS based ground net ground resistance test system of claim 8,
the input module which is connected with the control and data processing module and is used for the interface operation of the black and white dot matrix liquid crystal screen is a keyboard.
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