CN108490265B - Ground resistance testing method, device and tester - Google Patents
Ground resistance testing method, device and tester Download PDFInfo
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- CN108490265B CN108490265B CN201810372060.4A CN201810372060A CN108490265B CN 108490265 B CN108490265 B CN 108490265B CN 201810372060 A CN201810372060 A CN 201810372060A CN 108490265 B CN108490265 B CN 108490265B
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- 238000012360 testing method Methods 0.000 title claims abstract description 55
- 238000004458 analytical method Methods 0.000 claims abstract description 61
- 238000005259 measurement Methods 0.000 claims abstract description 55
- 238000012795 verification Methods 0.000 claims abstract description 29
- 238000000034 method Methods 0.000 claims abstract description 15
- 238000001914 filtration Methods 0.000 claims description 39
- 238000004891 communication Methods 0.000 claims description 35
- 238000012545 processing Methods 0.000 claims description 32
- 125000004122 cyclic group Chemical group 0.000 claims description 31
- 230000003321 amplification Effects 0.000 claims description 26
- 238000003199 nucleic acid amplification method Methods 0.000 claims description 26
- 238000004590 computer program Methods 0.000 claims description 3
- 230000001629 suppression Effects 0.000 description 8
- 230000001052 transient effect Effects 0.000 description 8
- 230000000875 corresponding effect Effects 0.000 description 7
- 230000008054 signal transmission Effects 0.000 description 7
- 238000010586 diagram Methods 0.000 description 3
- 239000000243 solution Substances 0.000 description 3
- 238000010998 test method Methods 0.000 description 3
- 230000005856 abnormality Effects 0.000 description 1
- 239000007864 aqueous solution Substances 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R27/00—Arrangements for measuring resistance, reactance, impedance, or electric characteristics derived therefrom
- G01R27/02—Measuring real or complex resistance, reactance, impedance, or other two-pole characteristics derived therefrom, e.g. time constant
- G01R27/20—Measuring earth resistance; Measuring contact resistance, e.g. of earth connections, e.g. plates
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- G—PHYSICS
- G08—SIGNALLING
- G08C—TRANSMISSION SYSTEMS FOR MEASURED VALUES, CONTROL OR SIMILAR SIGNALS
- G08C17/00—Arrangements for transmitting signals characterised by the use of a wireless electrical link
- G08C17/02—Arrangements for transmitting signals characterised by the use of a wireless electrical link using a radio link
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Abstract
The invention relates to the technical field of resistance testing, and provides a grounding resistance testing method, a grounding resistance testing device and a grounding resistance tester. The method comprises the following steps: receiving indication information sent by a host, and checking the indication information; if the verification is successful, analyzing the indication information to obtain an analysis result; and if the analysis result is a ground resistance measurement instruction, measuring the ground resistance. The method, the device and the tester can solve the problems that the grounding resistance measurement in the prior art has a lot of inconvenience and hidden danger and is unfavorable for the grounding resistance test.
Description
Technical Field
The invention relates to the technical field of resistance testing, in particular to a grounding resistance testing method, a grounding resistance testing device and a grounding resistance tester.
Background
The grounding resistance is an important technical index for lightning protection of equipment such as electric power, telecommunication and the like, so that related units need to send technicians to the site to measure the resistance of the grounding resistance at regular intervals and record and archive; and if the abnormality exists, carrying out treatment again. Because the existing ground resistance measuring instrument needs to be manually used for field measurement, the existing ground resistance measuring instrument naturally suffers from a plurality of limitations, such as weather problems, traffic problems and the like, and therefore, in the prior art, the ground resistance is measured with a plurality of inconveniences and hidden dangers, and the ground resistance test is not facilitated.
Disclosure of Invention
In view of the above, the embodiment of the invention provides a method, a device and a tester for testing ground resistance, which are used for solving the problems that the ground resistance is inconvenient and hidden trouble exists in the measurement of the ground resistance in the prior art, and the ground resistance is not convenient to test.
The embodiment of the invention provides a ground resistance testing method, which comprises the following steps:
receiving indication information sent by a host, and checking the indication information;
if the verification is successful, analyzing the indication information to obtain an analysis result;
and if the analysis result is a ground resistance measurement instruction, measuring the ground resistance.
Optionally, the indication information includes: the host computer generates a first cyclic redundancy check code according to the serial number, the address information and the operation instruction of the grounding resistance tester; and the analysis result is an operation instruction in the indication information.
Optionally, verifying the indication information includes:
comparing the serial numbers of the grounding resistance testers in the indication information with the serial numbers of the locally stored grounding resistance testers, and comparing the address information of the grounding resistance testers in the indication information with the address information of the locally stored grounding resistance testers;
If the comparison is consistent, generating a second cyclic redundancy check code according to the serial number, the address information and the operation instruction of the ground resistance tester in the indication information, and judging whether the verification is successful or not by comparing the first cyclic redundancy check code with the second cyclic redundancy check code.
Optionally, measuring the ground resistance includes:
collecting a voltage signal of a measured resistor and a voltage signal of a standard resistor;
filtering the voltage signal of the measured resistor and the voltage signal of the standard resistor;
and according to the filtered signals, calculating the grounding resistance value of the measured resistor, and storing and displaying the grounding resistance value.
Optionally, the ground resistance testing method further includes:
if the analysis result is the reading communication instruction, the grounding resistance value is sent to a host according to a preset protocol;
and if the analysis result is the inquiry resistance historical value instruction, all the historical stored grounding resistance values are sent to the host.
The embodiment of the invention provides a grounding resistance testing device, which comprises:
the verification module is used for receiving the indication information sent by the host and verifying the indication information;
the analysis module is used for analyzing the indication information when the verification is successful, and obtaining an analysis result;
And the grounding resistance measuring module is used for measuring the grounding resistance when the analysis result is a grounding resistance measuring instruction.
The embodiment of the invention provides a grounding resistance tester, which comprises: the main control micro-control unit, the measuring module and the power supply module;
the main control micro control unit is respectively connected with the measuring module and the power supply module, and the power supply module is connected with the measuring module;
the main control micro control unit is used for receiving the indication information sent by the host and checking the indication information; when the verification is successful, analyzing the indication information to obtain an analysis result; when the analysis result is a ground resistance measurement instruction, the control measurement module measures the ground resistance;
the measuring module is used for receiving a resistance measuring instruction sent by the main control micro-control unit, collecting a voltage signal of a measured resistor and a voltage signal of a standard resistor according to the resistance measuring instruction, performing filtering processing on the voltage signal of the measured resistor and the voltage signal of the standard resistor, and calculating to obtain a grounding resistance value of the measured resistor according to the signals after the filtering processing;
the power supply module is used for supplying power to the main control micro-control unit and the measurement module.
Optionally, the measurement module includes: the device comprises a waveform amplification output unit, a transformer unit, an external test unit, a standard resistor, a signal amplification output unit and a filtering unit;
the main control micro control unit is also used for generating sine wave signals;
the input end of the waveform amplification output unit is connected with the main control micro-control unit and is used for amplifying the sine wave signal;
the primary side of the transformer unit is respectively connected with the output end of the waveform amplification output unit and the ground, and the secondary side of the transformer is respectively connected with the standard resistor and the external test unit;
the signal amplification output unit is connected with the standard resistor and the tested resistor through the external test unit, and is used for acquiring and amplifying a voltage signal of the standard resistor and a voltage signal of the tested resistor;
the external test unit is connected with the standard resistor and is used for providing a voltage signal of the tested resistor for the signal amplification output unit;
the filtering unit is connected with the signal amplification output unit and is used for filtering the amplified voltage signal of the standard resistor and the voltage signal of the tested resistor;
The main control micro control unit is connected with the filtering unit and is used for carrying out data processing according to the voltage signal of the standard resistor after filtering and the voltage signal of the measured resistor after filtering to determine the grounding resistance value of the measured resistor.
Optionally, the ground resistance tester further includes: the device comprises a communication module 304, a storage module 305, a data processing module, a display screen and a key module; the communication module, the storage module, the data processing module, the display screen and the key module are respectively connected with the main control micro-control unit, and the communication module, the storage module, the data processing module, the display screen and the key module are respectively connected with the power supply module;
the communication module is used for receiving a read communication instruction sent by the main control micro-control unit, and sending the grounding resistance value to the host according to a preset protocol through the read communication instruction;
the storage module is used for storing the grounding resistance value and inquiring the resistance history value by a user;
the data processing module is used for receiving the analysis instruction and the indication information sent by the main control micro-control unit and analyzing the indication information;
the display screen is used for displaying the grounding resistance value or the resistance history value to a user;
And the key module is used for receiving an opening key signal sent by the main control micro control unit and allowing a user to inquire the resistance historical value.
Embodiments of the present invention provide a computer readable storage medium storing a computer program which, when executed by one or more processors, implements the steps of any of the ground resistance testing methods described above.
Compared with the prior art, the technical scheme adopted by the embodiment of the invention has the beneficial effects that: according to the embodiment of the invention, the indication information sent by the host is received, the indication information is checked to judge whether the received indication information is correct, if the check is successful, the indication information is analyzed to obtain an analysis result, if the analysis result is a ground resistance measurement instruction, the ground resistance is measured, the wireless signal transmission for measuring the ground resistance is realized, the ground resistance is conveniently measured, hidden danger in the process of measuring the ground resistance in the field by personnel is avoided, and the ground resistance test is facilitated through remote control.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings that are needed in the embodiments or the description of the prior art will be briefly described below, it being obvious that the drawings in the following description are only some embodiments of the present invention, and that other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.
FIG. 1 is a flow chart of a ground resistance test method according to an embodiment of the present invention;
FIG. 2 is a block diagram of a ground resistance test device according to an embodiment of the present invention;
FIG. 3 is a schematic block diagram of a ground resistance tester according to an embodiment of the present invention;
fig. 4 is a block diagram of a measurement module in a ground resistance tester according to an embodiment of the present invention.
Detailed Description
The following description of the embodiments of the present invention will be made clearly and fully with reference to the accompanying drawings, in which it is evident that the embodiments described are some, but not all embodiments of the invention. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
Referring to fig. 1, the ground resistance testing method provided by the embodiment of the invention may include:
step S101, receiving indication information sent by a host and checking the indication information.
The main implementation body of the method in this embodiment may be a ground resistance tester. Referring to fig. 1, the ground resistance tester receives indication information sent by the host, performs corresponding actions through the indication information, and determines whether the indication information sent by the host is correct before performing actions corresponding to the indication information, so as to ensure that the used ground resistance tester and the ground resistance to be measured are correct.
Step S102, if the verification is successful, analyzing the indication information to obtain an analysis result.
In this embodiment, if the verification of the indication information is successful, the indication information starts to be analyzed, where the indication information may be used to provide a verification basis for the ground resistance tester that receives the indication information, and when the verification result is correct, the ground resistance tester analyzes the indication information to obtain an analysis result, and performs a corresponding action according to the analysis result.
Step S103, if the analysis result is the ground resistance measurement command, the ground resistance is measured.
In this embodiment, the result of the parsing in the present invention may include at least one of the following: and executing the action corresponding to the ground resistance measurement instruction if the analysis result is the ground resistance measurement instruction, and measuring the ground resistance.
In practical application, the ground resistance tester can be fixedly connected with the ground resistance to be measured on site, specifically through a binding clip or a welding fixture and other modes, when the ground resistance is required to be measured, a user can input indication information from a host, or the host can automatically send the indication information to the ground resistance tester according to a preset strategy, and after the ground resistance tester receives the indication information, the automatic test of the ground resistance can be realized according to the indication information.
In this embodiment, the indication information sent by the host is received and checked to determine whether the received indication information is correct, if the check is successful, the indication information is analyzed to obtain an analysis result, if the analysis result is a ground resistance measurement instruction, the ground resistance is measured, wireless signal transmission for measuring the ground resistance is realized, the ground resistance is conveniently measured, hidden danger in the process of measuring the ground resistance in the field by personnel is avoided, and the ground resistance test is facilitated through remote control.
Further, the indication information includes: the host computer generates a first cyclic redundancy check code according to the serial number, the address information and the operation instruction of the grounding resistance tester; and the analysis result is an operation instruction in the indication information.
In this embodiment, the number of the ground resistance testers may be respectively set at the positions where the ground resistance is required to be tested, the numbers of the ground resistance testers are stored in an internal configuration file of the ground resistance testers, and the internal configuration file of the ground resistance testers may further include preset address information, where the preset address information includes the positions where the ground resistance is tested, the indication information sent by the receiving host may include the numbers of the ground resistance testers, the address information, the operation instruction, and a first cyclic redundancy check code generated by the host according to the numbers of the ground resistance testers, the address information, and the operation instruction, where the numbers of the ground resistance testers and the address information are used to be compared with the numbers in the ground resistance test where the indication information is received, and if they are consistent, it is indicated that the ground resistance testers that the indication information is received are correct, then further checking the indication information, and further checking may include further checking whether the first cyclic redundancy check code generated by the operation instruction sent by the host is further used to determine whether the indication is correct or valid. Specifically, the analysis result is an operation instruction in the indication information, the operation instruction is used for the ground resistance tester to perform corresponding operations, and the corresponding operations may be measuring a ground resistance, reading communication information, querying a resistance history value, and the like, where the communication information may be a measured ground resistance value.
Further, verifying the indication information includes: comparing the serial numbers of the grounding resistance testers in the indication information with the serial numbers of the locally stored grounding resistance testers, and comparing the address information of the grounding resistance testers in the indication information with the address information of the locally stored grounding resistance testers; if the comparison is consistent, generating a second cyclic redundancy check code according to the serial number, the address information and the operation instruction of the ground resistance tester in the indication information, and judging whether the verification is successful or not by comparing the first cyclic redundancy check code with the second cyclic redundancy check code.
In this embodiment, verifying the indication information may include:
embodiment one: firstly, comparing the serial number of the ground resistance tester in the indication information with the serial number of the ground resistance tester receiving the indication information, and comparing the address information of the ground resistance tester in the indication information with the preset address information of the ground resistance tester receiving the indication information, and judging whether the verification is successful according to the comparison result, wherein the comparison result can comprise: the comparison of the numbers and the comparison of the address information are incorrect, only one of the comparison of the numbers and the comparison of the address information is correct, the comparison of the numbers and the comparison of the address information are correct, and if the comparison result is that the comparison of the numbers and the comparison of the address information are correct, the verification is considered to be successful.
Embodiment two: firstly, comparing the serial number of the ground resistance tester in the indication information with the serial number of the ground resistance tester receiving the indication information, comparing the address information of the ground resistance tester in the indication information with the preset address information of the ground resistance tester receiving the indication information, if the serial number comparison and the address information comparison are correct, generating a second cyclic redundancy check code, wherein the second cyclic redundancy check code is used for comparing with the first cyclic redundancy check code, checking whether the operation instruction in the indication information is correct or effective, and if the first cyclic redundancy check code and the second cyclic redundancy check code are identical, indicating that the check is successful.
Optionally, measuring the ground resistance may include: collecting a voltage signal of a measured resistor and a voltage signal of a standard resistor; filtering the voltage signal of the measured resistor and the voltage signal of the standard resistor; and according to the filtered signals, calculating the grounding resistance value of the measured resistor, and storing and displaying the grounding resistance value.
In this embodiment, the ground resistance tester may collect a voltage signal of a measured resistor and a voltage signal of a standard resistor, where the measured resistor may be a ground resistor, and calculate a ground resistance value of the measured resistor by performing filtering processing on the voltage signal of the measured resistor and the voltage signal of the standard resistor, where the filtering processing may include calculating the ground resistance value of the measured resistor by an active band-pass filter and fourier transform, and combining a preset proportion algorithm, and storing and displaying the ground resistance value to a user.
Further, the ground resistance testing method may further include: if the analysis result is the reading communication instruction, the grounding resistance value is sent to a host according to a preset protocol; and if the analysis result is the inquiry resistance historical value instruction, all the historical stored grounding resistance values are sent to the host.
In this embodiment, after receiving the instruction information, the ground resistance tester waits for the instruction information in the analysis result, and after obtaining the instruction information, performs a corresponding operation according to the instruction information, and if the instruction information is a read communication instruction, the read communication instruction is used to instruct the ground resistance tester to read the measured ground resistance value, and communicate with the host, and send the ground resistance value to the host according to a preset protocol. And if the instruction information is an inquiry resistance historical value instruction, the inquiry resistance historical value instruction is used for indicating the ground resistance tester to inquire the storage record of the resistance historical value, and all the historical stored ground resistance values are sent to the host.
According to the ground resistance test method, the indication information sent by the host is received, the indication information is checked to judge whether the received indication information is correct, if the check is successful, the indication information is analyzed, an analysis result is obtained, the analysis result can comprise a ground resistance measurement instruction, a communication instruction and an inquiry resistance historical value instruction, the ground resistance is measured through the ground resistance measurement instruction, the ground resistance value is sent to the host through the communication instruction, all the historical stored ground resistance values are sent to the host through the inquiry resistance historical value instruction, the multifunctional ground resistance tester is realized, and when the ground resistance is measured, the ground resistance value of the measured resistance is calculated according to the voltage signal of the measured resistance and the voltage signal of the standard resistance, so that the measurement of the ground resistance is more accurate, the wireless signal transmission for measuring the ground resistance is realized, the ground resistance is convenient to measure, hidden danger in the ground resistance is avoided in the ground resistance measurement process of personnel is avoided, and the ground resistance is conveniently tested through remote control.
Referring to fig. 2, a ground resistance testing device provided by an embodiment of the present invention may include:
the verification module 201 is configured to receive indication information sent by a host, and verify the indication information; the analysis module 202 is configured to analyze the indication information when the verification is successful, and obtain an analysis result; the ground resistance measurement module 203 is configured to measure a ground resistance when the analysis result is a ground resistance measurement command.
The ground resistance testing device in this embodiment may be used to execute the ground resistance testing method shown in fig. 1, and the specific implementation principle thereof may be referred to the above method embodiment, which is not described herein again.
In this embodiment, by setting the verification module 201, the analysis module 202 and the ground resistance measurement module 203, the device is configured to receive indication information sent by a host, and verify the indication information, so as to determine whether the received indication information is correct, if the verification is successful, analyze the indication information, obtain an analysis result, and if the analysis result is a ground resistance measurement instruction, measure a ground resistance, so as to realize wireless signal transmission for measuring the ground resistance, facilitate measurement of the ground resistance, avoid hidden danger occurring in the process of measuring the ground resistance by personnel in the field, and facilitate the ground resistance test by remote control.
Further, the parsing module 202 is specifically configured to: comparing the serial numbers of the grounding resistance testers in the indication information with the serial numbers of the locally stored grounding resistance testers, and comparing the address information of the grounding resistance testers in the indication information with the address information of the locally stored grounding resistance testers; if the comparison is consistent, generating a second cyclic redundancy check code according to the serial number, the address information and the operation instruction of the ground resistance tester in the indication information, and judging whether the verification is successful or not by comparing the first cyclic redundancy check code with the second cyclic redundancy check code. Wherein, the indication information includes: the host computer generates a first cyclic redundancy check code according to the serial number, the address information and the operation instruction of the grounding resistance tester; and the analysis result is an operation instruction in the indication information.
The ground resistance measurement module 203 is specifically configured to: collecting a voltage signal of a measured resistor and a voltage signal of a standard resistor; filtering the voltage signal of the measured resistor and the voltage signal of the standard resistor; and according to the filtered signals, calculating the grounding resistance value of the measured resistor, and storing and displaying the grounding resistance value.
Optionally, the above ground resistance testing device may further include:
the reading communication module is used for sending the grounding resistance value to the host according to a preset protocol when the analysis result is a reading communication instruction;
and the inquiry resistance historical value module is used for sending all the historical stored grounding resistance values to the host computer when the analysis result is an inquiry resistance historical value instruction.
In this embodiment, through setting up the verification module 201, the analysis module 202, the ground resistance measurement module 203, the reading communication module and the query resistance historical value module, the verification is performed on the indication information, which is used to determine whether the received indication information is correct, when the verification is successful, the indication information is analyzed, the analysis result can be obtained, which includes a ground resistance measurement instruction, a reading communication instruction and a query resistance historical value instruction, the ground resistance is measured through the ground resistance measurement instruction, the ground resistance is sent to the host through the reading communication instruction, all the stored ground resistance values are sent to the host through the query resistance historical value instruction, so as to realize the multifunction of the ground resistance tester, and when the ground resistance is measured, the ground resistance value of the measured resistance is calculated according to the filtered signal through the voltage signal collection and the filtering processing of the measured resistance, so that the measurement of the ground resistance is more accurate, and the wireless signal transmission of the measured ground resistance is realized, the ground resistance is convenient to be measured, and the ground resistance is prevented from hidden danger in the ground resistance is avoided through the remote control of the ground resistance.
Referring to fig. 3, a ground resistance tester provided in an embodiment of the present invention may include: a main control micro control unit 301, a measurement module 303 and a power supply module 302; the main control micro control unit 301 is respectively connected with the measurement module 303 and the power supply module 302, and the power supply module 302 is connected with the measurement module 303; the main control micro control unit 301 is configured to receive indication information sent by a host, and verify the indication information; when the verification is successful, analyzing the indication information to obtain an analysis result; when the analysis result is a ground resistance measurement instruction, the control measurement module 303 measures the ground resistance; the measurement module 303 is configured to receive a resistance measurement instruction sent by the main control micro control unit 301, collect a voltage signal of a measured resistor and a voltage signal of a standard resistor according to the resistance measurement instruction, perform filtering processing on the voltage signal of the measured resistor and the voltage signal of the standard resistor, and calculate a ground resistance value of the measured resistor according to the filtered signal; the power module 302 is configured to supply power to the main control micro control unit 301 and the measurement module 303.
The structure, function and connection relation of each component in the ground resistance tester provided in this embodiment can be referred to the above embodiments, and will not be described herein.
In this embodiment, a main control micro control unit 301, a measurement module 303 and a power module 302 are provided, after the power module 302 supplies power to the main control micro control unit 301 and the measurement module 303, the main control micro control unit is used for receiving indication information sent by a host, checking the indication information to determine whether the received indication information is correct, analyzing the indication information when the checking is successful, obtaining an analysis result, controlling the measurement module 303 to measure a grounding resistor when the analysis result is a grounding resistor measurement instruction, and obtaining a grounding resistor value of the measured resistor through voltage signal acquisition and filtering processing of a voltage signal of the measured resistor and a voltage signal of a standard resistor when the grounding resistor is measured, according to the signals after the filtering processing, so that the measurement of the grounding resistor is more accurate, wireless signal transmission for measuring the grounding resistor is realized, hidden danger in the process of measuring the grounding resistor in the field is avoided, and the grounding resistor is tested through remote control.
Further, referring to fig. 4, the measurement module 303 may include: the device comprises a waveform amplification output unit 401, a transformer unit 402, an external test unit 404, a standard resistor 405, a signal amplification output unit 406 and a filtering unit 407; the main control micro control unit 301 is further configured to generate a sine wave signal; the input end of the waveform amplification output unit 401 is connected with the main control micro control unit 301, and is used for amplifying the sine wave signal; the primary side of the transformer unit 402 is connected with the output end of the waveform amplification output unit 401 and the ground respectively, and the secondary side of the transformer is connected with the standard resistor 405 and the external test unit 404 respectively; the signal amplification output unit 406 is connected with the standard resistor 405, and is connected with a tested resistor through the external test unit 404, and is used for obtaining and amplifying a voltage signal of the standard resistor 405 and a voltage signal of the tested resistor; the external test unit 404 is connected with the standard resistor 405, and is used for providing the voltage signal of the tested resistor for the signal amplification output unit 406; the filtering unit 407 is connected to the signal amplifying output unit 406, and is configured to perform filtering processing on the amplified voltage signal of the standard resistor 405 and the voltage signal of the measured resistor; the master micro control unit 301 is connected to the filtering unit 407, and is configured to perform data processing according to the voltage signal of the filtered standard resistor 405 and the voltage signal of the filtered measured resistor, and determine a ground resistance value of the measured resistor.
In this embodiment, the waveform amplification output unit 401 includes: the input end of the waveform amplifier is the input end of the waveform amplification output unit 401 and is connected with the main control micro control unit 301, the output end of the waveform amplifier is the output end of the waveform amplification output unit 401 and is connected with the transformer unit 402, and the waveform amplifier is used for amplifying the sine wave signal; the transformer unit 402 includes: the transformer and the third transient voltage suppression diode, the secondary side of the transformer is connected in parallel with the third transient voltage suppression diode, the primary side of the transformer is connected with the output end of the waveform amplifier and the ground respectively, the secondary side of the transformer is connected with the standard resistor 405 and the external test unit 404 respectively, the transformer is used for isolating action and converting signals into alternating current output, as the ground conduction usually needs to pass through aqueous solution, if the ground resistor is measured by direct current, the electrolyzed bubbles are gathered on the electrode to be measured, the counter potential is generated by the bubbles, the conduction cross section is reduced, the resistance is increased, and the accuracy of measurement is affected. The transformer unit 402 is connected to the external test unit 404 through a temperature protection circuit 403, and the temperature protection circuit 403 includes: the temperature protection circuit 403 is used for being disconnected when the temperature is greater than a preset threshold value, the secondary side of the transformer is connected with the first resistor, and the external test unit 404 is connected with the temperature-sensitive resistor; the signal amplification output unit 406 includes: the input end of the signal amplifier is the input end of the signal amplification output unit 406, connected with the standard resistor 405 and connected with the tested resistor through the external test unit 404, the output end of the signal amplifier is the output end of the signal amplification output unit 406 and connected with the filtering unit 407, and the signal amplifier is used for acquiring and amplifying the voltage signal of the standard resistor 405 and the voltage signal of the tested resistor; the external test unit 404 includes: the device comprises a tested grounding electrode, an auxiliary voltage electrode, an auxiliary current electrode, a first transient voltage suppression diode and a second transient voltage suppression diode, wherein one end of the tested grounding electrode is respectively connected with one end of the standard resistor 405 and one end of the second transient voltage suppression diode, the other end of the second transient voltage suppression diode is respectively connected with one end of the auxiliary voltage electrode and one end of the first transient voltage suppression diode, the other end of the first transient voltage suppression diode is respectively connected with the temperature-sensitive resistor and the auxiliary current electrode, and the other end of the tested grounding electrode is connected with the tested resistor; the other end of the auxiliary voltage pole is connected with a grounding resistor at a first preset range of a measured resistor, the other end of the auxiliary current pole is connected with a grounding resistor at a second preset range of the measured resistor, and the external test unit 404 is arranged for measuring the resistor by adopting a three-level method; the filtering unit 407 includes: the input end of the active band-pass filter is the input end of the filtering unit 407, and is connected with the output end of the signal amplifier, the output end of the active band-pass filter is the output end of the filtering unit 407, and is connected with the master control micro-control unit 301, and the active band-pass filter is used for performing filtering processing on the amplified voltage signal of the standard resistor 405 and the voltage signal of the measured resistor, and the filtering processing may include a hardware active band-pass filter and a software fourier transform; the master micro control unit 301 is configured to generate a sine wave signal, and further perform data processing according to the filtered voltage signal of the standard resistor 405 and the filtered voltage signal of the measured resistor, to determine a ground resistance value of the measured resistor.
Specifically, the measurement module 303 is configured to accurately measure the ground resistance, where the main control micro control unit 301 outputs a sine wave with a frequency F0 (the frequency is 50Hz different from the power frequency, so that the active band-pass filter can perform filtering processing) through the DAC, amplifies the sine wave through the waveform amplifier, drives the transformer, and makes the transformer output an ac signal, inject the ac signal into the auxiliary current C pole, flow through the detected ground pole E to form a loop, the main control micro control unit 301 collects the signal of the standard resistor 405, the signal of the detected ground pole E and the signal of the auxiliary voltage P pole through the ADC, amplifies the signal through the signal amplifier, and then performs active band-pass filtering, so that the interference signal can be effectively shielded, and then performs software filtering (such as fourier transform), so as to calculate the ground resistance value of the detected ground pole E according to a preset proportion algorithm.
Further, referring to fig. 3, the ground resistance tester may further include: a communication module 304, a storage module 305, a data processing module 306, a display 308, and a key module 307; the communication module 304, the storage module 305, the data processing module 306, the display screen 308 and the key module 307 are respectively connected with the main control micro-control unit 301, and the communication module 304, the storage module 305, the data processing module 306, the display screen 308 and the key module 307 are respectively connected with the power supply module 302; the communication module 304 is configured to receive a read communication instruction sent by the main control micro control unit 301, and send the ground resistance value to a host according to a preset protocol through the read communication instruction; a storage module 305, configured to store the ground resistance value, and provide a user with a query for a resistance history value; the data processing module 306 is configured to receive an analysis instruction and indication information sent by the main control micro control unit 301, and analyze the indication information; a display screen 308 for displaying the ground resistance value or resistance history value to a user; the key module 307 is configured to receive an on key signal sent by the main control micro control unit 301, and provide the user with a query for the resistance history value.
In this embodiment, by setting the communication module 304, the storage module 305, the data processing module 306, the display screen 308, and the key module 307, the indication information is analyzed, so that the ground resistance tester can perform an operation according to the analysis result, communicate with the host, send the ground resistance value to the host, store the measured ground resistance value, display the ground resistance value or the resistance history value to the user, and query the resistance history value according to the start key signal sent by the main control micro-control unit 301, so as to implement the multifunction of the ground resistance tester.
The present invention provides a computer readable storage medium storing a computer program which, when executed by one or more processors, performs the steps of the above method.
The computer readable storage medium in this embodiment may be used to execute the ground resistance testing method shown in fig. 1, and the specific implementation principle thereof may be referred to the above method embodiment, which is not described herein again.
According to the invention, the indication information sent by the host computer is received and checked by the test method, the device and the tester, if the received indication information is correct, the indication information is analyzed to obtain an analysis result, the analysis result can comprise a ground resistance measurement instruction, a communication instruction and a resistance inquiry historical value instruction, the ground resistance is measured by the ground resistance measurement instruction, the ground resistance value is sent to the host computer by the communication instruction, all the historical ground resistance values are sent to the host computer by the resistance inquiry historical value instruction, the multifunctional ground resistance tester is realized, and when the ground resistance is measured, the ground resistance value of the measured resistance is calculated according to the signals after the filtering processing by collecting the voltage signals of the measured resistance and the voltage signals of the standard resistance 405, so that the measurement of the ground resistance is more accurate, the wireless signal transmission of the measured ground resistance is realized, the ground resistance is conveniently measured, the hidden danger of personnel in the ground resistance is avoided in the ground resistance measurement process, and the ground resistance is controlled remotely by the remote test.
The above embodiments are only for illustrating the technical solution of the present invention, and not for limiting the same; although the invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical scheme described in the foregoing embodiments can be modified or some technical features thereof can be replaced by equivalents; such modifications and substitutions do not depart from the spirit and scope of the technical solutions of the embodiments of the present invention, and are intended to be included in the scope of the present invention.
Claims (8)
1. A ground resistance testing method performed by a ground resistance tester, comprising:
receiving indication information sent by a host, and checking the indication information; the grounding resistance testing device comprises a plurality of grounding resistance testers, a plurality of address information and a plurality of control units, wherein the grounding resistance testers are respectively arranged at positions where grounding resistance needs to be tested, the grounding resistance testers are numbered and stored in an internal configuration file of the grounding resistance tester, the internal configuration file of the grounding resistance tester also comprises preset address information, and the preset address information comprises positions where the grounding resistance needs to be tested; the indication information includes: the host computer generates a first cyclic redundancy check code according to the serial number, the address information and the operation instruction of the grounding resistance tester; wherein verifying the indication information includes:
Comparing the serial numbers of the grounding resistance testers in the indication information with the serial numbers of the locally stored grounding resistance testers, and comparing the address information of the grounding resistance testers in the indication information with the address information of the locally stored grounding resistance testers;
if the comparison is consistent, generating a second cyclic redundancy check code according to the serial number, the address information and the operation instruction of the ground resistance tester in the indication information, and judging whether the verification is successful or not by comparing the first cyclic redundancy check code with the second cyclic redundancy check code;
if the verification is successful, analyzing the indication information to obtain an analysis result; the analysis result is an operation instruction in the indication information;
and if the analysis result is a ground resistance measurement instruction, measuring the ground resistance.
2. The ground resistance testing method according to claim 1, wherein measuring the ground resistance comprises:
collecting a voltage signal of a measured resistor and a voltage signal of a standard resistor;
filtering the voltage signal of the measured resistor and the voltage signal of the standard resistor;
and according to the filtered signals, calculating the grounding resistance value of the measured resistor, and storing and displaying the grounding resistance value.
3. The ground resistance testing method according to claim 2, further comprising:
if the analysis result is the reading communication instruction, the grounding resistance value is sent to a host according to a preset protocol;
and if the analysis result is the inquiry resistance historical value instruction, all the historical stored grounding resistance values are sent to the host.
4. A ground resistance testing device included in a ground resistance tester, comprising:
the verification module is used for receiving the indication information sent by the host and verifying the indication information; the grounding resistance testing device comprises a plurality of grounding resistance testers, a plurality of address information and a plurality of control units, wherein the grounding resistance testers are respectively arranged at positions where grounding resistance needs to be tested, the grounding resistance testers are numbered and stored in an internal configuration file of the grounding resistance tester, the internal configuration file of the grounding resistance tester also comprises preset address information, and the preset address information comprises positions where the grounding resistance needs to be tested; the indication information includes: the host computer generates a first cyclic redundancy check code according to the serial number, the address information and the operation instruction of the grounding resistance tester; wherein verifying the indication information includes:
Comparing the serial numbers of the grounding resistance testers in the indication information with the serial numbers of the locally stored grounding resistance testers, and comparing the address information of the grounding resistance testers in the indication information with the address information of the locally stored grounding resistance testers;
if the comparison is consistent, generating a second cyclic redundancy check code according to the serial number, the address information and the operation instruction of the ground resistance tester in the indication information, and judging whether the verification is successful or not by comparing the first cyclic redundancy check code with the second cyclic redundancy check code;
the analysis module is used for analyzing the indication information when the verification is successful, and obtaining an analysis result; the analysis result is an operation instruction in the indication information;
and the grounding resistance measuring module is used for measuring the grounding resistance when the analysis result is a grounding resistance measuring instruction.
5. A ground resistance tester, comprising: the main control micro-control unit, the measuring module and the power supply module;
the main control micro control unit is respectively connected with the measuring module and the power supply module, and the power supply module is connected with the measuring module;
The main control micro control unit is used for receiving the indication information sent by the host and checking the indication information; when the verification is successful, analyzing the indication information to obtain an analysis result; when the analysis result is a ground resistance measurement instruction, the control measurement module measures the ground resistance; the grounding resistance testing device comprises a plurality of grounding resistance testers, a plurality of address information and a plurality of control units, wherein the grounding resistance testers are respectively arranged at positions where grounding resistance needs to be tested, the grounding resistance testers are numbered and stored in an internal configuration file of the grounding resistance tester, the internal configuration file of the grounding resistance tester also comprises preset address information, and the preset address information comprises positions where the grounding resistance needs to be tested; the indication information includes: the host computer generates a first cyclic redundancy check code according to the serial number, the address information and the operation instruction of the grounding resistance tester; wherein verifying the indication information includes:
comparing the serial numbers of the grounding resistance testers in the indication information with the serial numbers of the locally stored grounding resistance testers, and comparing the address information of the grounding resistance testers in the indication information with the address information of the locally stored grounding resistance testers;
If the comparison is consistent, generating a second cyclic redundancy check code according to the serial number, the address information and the operation instruction of the ground resistance tester in the indication information, and judging whether the verification is successful or not by comparing the first cyclic redundancy check code with the second cyclic redundancy check code;
the analysis result is an operation instruction in the indication information;
the measuring module is used for receiving a resistance measuring instruction sent by the main control micro-control unit, collecting a voltage signal of a measured resistor and a voltage signal of a standard resistor according to the resistance measuring instruction, performing filtering processing on the voltage signal of the measured resistor and the voltage signal of the standard resistor, and calculating to obtain a grounding resistance value of the measured resistor according to the signals after the filtering processing;
the power supply module is used for supplying power to the main control micro-control unit and the measurement module.
6. The ground resistance tester of claim 5, wherein the measurement module comprises: the device comprises a waveform amplification output unit, a transformer unit, an external test unit, a standard resistor, a signal amplification output unit and a filtering unit;
the main control micro control unit is also used for generating sine wave signals;
The input end of the waveform amplification output unit is connected with the main control micro-control unit and is used for amplifying the sine wave signal;
the primary side of the transformer unit is respectively connected with the output end of the waveform amplification output unit and the ground, and the secondary side of the transformer is respectively connected with the standard resistor and the external test unit;
the signal amplification output unit is connected with the standard resistor and the tested resistor through the external test unit, and is used for acquiring and amplifying a voltage signal of the standard resistor and a voltage signal of the tested resistor;
the external test unit is connected with the standard resistor and is used for providing a voltage signal of the tested resistor for the signal amplification output unit;
the filtering unit is connected with the signal amplification output unit and is used for filtering the amplified voltage signal of the standard resistor and the voltage signal of the tested resistor;
the main control micro control unit is connected with the filtering unit and is used for carrying out data processing according to the voltage signal of the standard resistor after filtering and the voltage signal of the measured resistor after filtering to determine the grounding resistance value of the measured resistor.
7. The ground resistance tester of claim 5, further comprising: the device comprises a communication module, a storage module, a data processing module, a display screen and a key module; the communication module, the storage module, the data processing module, the display screen and the key module are respectively connected with the main control micro-control unit, and the communication module, the storage module, the data processing module, the display screen and the key module are respectively connected with the power supply module;
The communication module is used for receiving a read communication instruction sent by the main control micro-control unit, and sending the grounding resistance value to the host according to a preset protocol through the read communication instruction;
the storage module is used for storing the grounding resistance value and inquiring the resistance history value by a user;
the data processing module is used for receiving the analysis instruction and the indication information sent by the main control micro-control unit and analyzing the indication information;
the display screen is used for displaying the grounding resistance value or the resistance history value to a user;
and the key module is used for receiving an opening key signal sent by the main control micro control unit and allowing a user to inquire the resistance historical value.
8. A computer-readable storage medium, characterized in that it stores a computer program which, when executed by one or more processors, implements the steps of the method according to any one of claims 1 to 3.
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| CN113281571A (en) * | 2021-05-27 | 2021-08-20 | 深圳远征技术有限公司 | Grounding resistance measuring circuit, control method thereof and resistance measuring device |
| CN114217134B (en) * | 2021-11-01 | 2023-11-17 | 通富微电子股份有限公司 | Ground resistance monitor and ground resistance monitoring system |
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