CN112162156A - Resistance measuring device, resistance measuring method, resistance measuring apparatus, and storage medium - Google Patents
Resistance measuring device, resistance measuring method, resistance measuring apparatus, and storage medium Download PDFInfo
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- 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
- G01R27/08—Measuring resistance by measuring both voltage and current
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R1/00—Details of instruments or arrangements of the types included in groups G01R5/00 - G01R13/00 and G01R31/00
- G01R1/20—Modifications of basic electric elements for use in electric measuring instruments; Structural combinations of such elements with such instruments
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Abstract
The invention discloses a resistance measurer, a method, a device, equipment and a storage medium. The resistance measurer comprises a current acquisition unit, a voltage acquisition unit, a variable resistance unit and an operation control unit, wherein the operation control unit is used for setting an access resistance value of the variable resistance unit and calculating a resistance value of an object to be measured, the current acquisition unit is accessed to a power supply voltage, the current acquisition unit is connected with the variable resistance unit, the variable resistance unit is connected with the object to be measured, the object to be measured is accessed to the power supply voltage, the voltage acquisition unit is connected with the variable resistance unit, and the voltage acquisition unit is connected with the object to be measured. The whole resistance value of the measuring loop of the resistance measurer is changed by changing the access resistance value of the variable resistance unit, so that the damping time constant of the measuring loop can be effectively increased, the time for induced current attenuation is shortened, the data is accelerated to be stable, the testing time is effectively shortened, and the obtained data is more efficient and reliable.
Description
Technical Field
Embodiments of the present invention relate to resistance measurement technologies, and in particular, to a resistance measuring device, a resistance measuring method, a resistance measuring apparatus, a resistance measuring device, a resistance measuring apparatus, and a storage medium.
Background
The transformer substation relates to the installation of coil equipment and spacing equipment such as transformers, circuit breakers, mutual inductors and the like in the installation, maintenance and repair processes. During and after installation, various devices need to be tested so as to ensure the normal and safe operation of the transformer substation.
The direct resistance tester is a testing device commonly used for measuring the direct current resistance of a coil winding transformer, and can realize resistance measurement of windings of the transformer and a mutual inductor. During testing, a test article to be tested is connected to the direct resistance tester, then the direct resistance tester applies a constant voltage source or a constant current source to the test article to be tested, the voltage and the current at two ends of the test article are measured, and then the resistance value to be tested of the test article is obtained by utilizing ohm's law calculation, wherein the measurement range is milliohm to ohm. In addition, when the substation detects the loop resistance of the circuit breaker equal-spacing equipment and devices, the substation needs to detect the loop resistance of the circuit breaker equal-spacing equipment by using a loop resistance tester with the measuring range in the microohm level, and measure the loop resistance of the circuit.
The mode ensures that a large amount of special equipment is needed in the installation, maintenance and repair processes, so that the installation, maintenance and repair workload is large and the cost is high, in the test process, because of the inductance effect of the closed coil winding, when the actual measurement is carried out, the induced current attenuation is needed to be finished, and more accurate data can be obtained after the current and the voltage are stable, so that the actual test time is too long.
Disclosure of Invention
The invention provides a resistance measuring device, a method, a device, equipment and a storage medium, which are used for conveniently and quickly measuring the resistance of coil equipment, spacing equipment and the like in a transformer substation.
In a first aspect, an embodiment of the present invention provides a resistance measuring device, including a current collecting unit, a voltage collecting unit, a variable resistance unit, and an operation control unit, where the operation control unit is configured to set an access resistance value of the variable resistance unit and calculate a resistance value of an object to be measured, a first end of the current collecting unit is accessed to a power supply voltage, a second end of the current collecting unit is connected to the first end of the variable resistance unit, a second end of the variable resistance unit is connected to the first end of the object to be measured, a second end of the object to be measured is accessed to the power supply voltage, a first end of the voltage collecting unit is connected to the first end of the variable resistance unit, a second end of the voltage collecting unit is connected to the second end of the object to be measured, and an input end of the operation control unit is connected to the current collecting unit and the voltage collecting unit, and the output end of the operation control unit is connected with the control end of the variable resistance unit.
Optionally, the voltage acquisition unit includes a voltage transformer, a first end of the voltage transformer is connected with a first end of the variable resistance unit, and a second end of the voltage transformer is connected with a second end of the object to be detected.
Optionally, the device further comprises a rectifier and a voltage stabilizing capacitor, wherein an input end of the rectifier is connected with a power supply, and an output end of the rectifier is connected with the first end of the current collecting unit and the second end of the object to be detected.
In a second aspect, an embodiment of the present invention further provides a resistance measurement method, including:
setting the access resistance value of a variable resistance unit of the resistance measurer;
acquiring a current signal sent by a current acquisition unit of the resistance measurer and a voltage signal sent by a voltage acquisition unit of the resistance measurer in the working process of the resistance measurer;
and determining the resistance value of the object to be detected based on the access resistance value, the current signal and the voltage signal.
Optionally, the setting of the access resistance value of the variable resistance unit of the resistance measurer includes:
acquiring a working gear selected by a user, wherein the working gear is used for distinguishing different types of objects to be detected;
inquiring a numerical value set corresponding to the working gear to serve as an access resistance value of a variable resistance unit of the resistance measurer, wherein the numerical value is positively correlated with the working gear;
and setting the variable resistance unit according to the access resistance value.
Optionally, the determining the resistance value of the object to be measured based on the access resistance value, the current signal, and the voltage signal includes:
sorting the current signals and the voltage signals according to acquisition time;
calculating a reference resistance value of the object to be measured at a corresponding time based on the access resistance value, the current signal and the voltage signal;
calculating the ratio of the difference value between two adjacent reference resistance values to the reference resistance value at the previous time according to the sequence of the acquisition time;
if the ratio is smaller than or equal to a preset threshold value, taking the reference resistance value as the resistance value of the object to be detected;
and if the ratio is larger than a preset threshold, returning to execute the calculation of the ratio of the difference value between two adjacent reference resistance values to the reference resistance value at the previous time according to the sequence of the acquisition time.
Optionally, the reference resistance value is calculated by the following formula:
wherein R isTnIs the reference resistance value, UTnFor the voltage signal at the corresponding time, ITnFor the current signal at the corresponding instant, RpIs the access resistance value.
In a third aspect, an embodiment of the present invention further provides a resistance measurement apparatus, including:
the setting module is used for setting the access resistance value of the variable resistance unit of the resistance measurer;
the acquisition module is used for acquiring a current signal sent by a current acquisition unit of the resistance measurer and a voltage signal sent by a voltage acquisition unit of the resistance measurer in the working process of the resistance measurer;
and the calculation module is used for determining the resistance value of the object to be detected based on the access resistance value, the current signal and the voltage signal.
In a fourth aspect, an embodiment of the present invention provides a resistance measuring apparatus, where the apparatus includes:
one or more processors;
a storage device for storing one or more programs,
when executed by the one or more processors, cause the one or more processors to implement the resistance measurement method of the second aspect.
In a fifth aspect, the present invention further provides a computer-readable storage medium, on which a computer program is stored, where the computer program is executed by a processor to implement the resistance measurement method according to the second aspect.
According to the invention, the variable resistance unit is connected with the object to be tested in series, the access resistance value of the variable resistance unit is changed, and the overall resistance value of the measurement loop of the resistance measurer is changed, so that the damping time constant of the measurement loop can be effectively increased, the induced current attenuation time is shortened, and the data stability is accelerated, so that the test time is effectively shortened, and the obtained data is more efficient and reliable.
Drawings
Fig. 1 is a schematic structural diagram of an electrical resistance measuring device according to a first embodiment of the present invention;
FIG. 2 is a flow chart of a resistance measuring method according to a second embodiment of the present invention;
FIG. 3 is a flow chart of a resistance measuring method according to a third embodiment of the present invention;
FIG. 4 is a schematic structural diagram of a resistance measuring apparatus according to a fourth embodiment of the present invention;
fig. 5 is a schematic structural diagram of a resistance measurement device in the fifth embodiment of the present invention.
Detailed Description
The present invention will be described in further detail with reference to the accompanying drawings and examples. It is to be understood that the specific embodiments described herein are merely illustrative of the invention and are not limiting of the invention. It should be further noted that, for the convenience of description, only some of the structures related to the present invention are shown in the drawings, not all of the structures.
Example one
Fig. 1 is a structural diagram of a resistance measuring device according to a first embodiment of the present invention. The embodiment can be applied to the test of the direct current resistance of the coil winding transformer or the loop resistance of the circuit. Specifically comprises a current acquisition unit T1Voltage acquisition unit T2Variable resistance unit RpAnd an operation control unit for setting the variable resistance unit RpAnd calculating the R of the object to be measuredXResistance value, current collecting unit T1The first end of the power supply is connected with a power supply voltage and a current acquisition unit T1Second terminal and variable resistance unit RpIs connected to the first terminal of the variable resistance unit RpSecond end of and object to be measured RXIs connected to the object R to be measuredXThe second end of the power supply is connected with a power supply voltage and a voltage acquisition unit T2First terminal and variable resistance unitRpIs connected with a voltage acquisition unit T2Second end of and object to be measured RXThe second end of the operational control unit is connected with the input end of the operational control unit and the current acquisition unit T1Voltage acquisition unit T2Connected to the output of the arithmetic control unit and to the variable resistance unit RpIs connected with the control end of the controller.
In the present embodiment, the variable resistance unit RpThe resistance value of the resistance meter is adjustable, is controlled by the operation control unit, and can be set to be specifically connected to the resistance value of the working circuit of the resistance meter through the operation control unit. Variable resistance unit RpThe structural forms and the concrete principles of the invention are well known in the art, and the invention is not limited to the details.
In the present embodiment, the variable resistance unit R is formedpAnd an object to be measured RXIn series, by varying the resistance of the variable resistance unit RpThe access resistance value of the resistance measurer can be changed, the overall resistance value of a measuring loop of the resistance measurer can be changed, the damping time constant of the measuring loop can be effectively increased, the time of induced current attenuation can be shortened, the data stability can be accelerated, the testing time can be effectively shortened, and the obtained data can be more efficient and reliable.
In the present embodiment, the arithmetic control unit may be composed of an arithmetic unit and a controller. An operator (arithmetric unit) is a means for performing various arithmetic and logical operation operations. In the present embodiment, the operator is mainly used to realize the operation according to the variable resistance unit RpAccess resistance value and current collecting unit T1Collected current value and voltage collecting unit T2Calculating the collected voltage value to obtain the object R to be measuredXThe resistance value of (2).
A controller refers to a master device that changes wiring of a main circuit or a control circuit, changes resistance values in the circuit, and the like in a predetermined order. The system consists of a program counter, an instruction register, an instruction decoder, a time sequence generator and an operation controller, and is a decision mechanism for issuing commands, namely, the decision mechanism is used for coordinating and commanding the operation of the whole computer system. In the present embodiment, the controller is mainly used to implement the variable resistance unit RpControl of the resistance of the switch-inAnd controlling the working state of the resistance measurer.
Further, in the present embodiment, the variable resistance unit RpThe access resistance value can be adjusted manually instead of through the operation control unit. It is sufficient if the damping time constant of the test circuit of the resistance measuring device can be adjusted.
In the present embodiment, the object R to be measuredXAre respectively connected with a variable resistance unit R of a resistance measuring devicepAnd a power supply, and a current collecting unit T in the resistor measurer1And a variable resistance unit RpAre arranged in series. Current acquisition unit T1A first terminal connected to a supply voltage, a second terminal and a variable resistance unit RpIs connected to the first end of the object R to be measuredXFirst terminal and variable resistance unit RpThen connecting the second end of the object R to be measuredXThe second end of the power supply is connected with a power supply voltage, so that the current acquisition unit T is realized1Variable resistance unit RpAnd an object to be measured RXSo as to flow through the current collecting unit T1The magnitude of the current and the current flowing through the object R to be measuredXIs consistent in current magnitude, thereby being capable of passing through the current acquisition unit T1To the object R to be measuredXThe magnitude of the current of (2). Will voltage acquisition unit T2And a variable resistance unit RpAnd an object to be measured RXThe parallel arrangement can realize the loading on the variable resistance unit RpAnd an object to be measured RXThe acquisition of the voltage on.
In the present embodiment, the voltage collecting unit T2A voltage transformer may be included. A Voltage Transformer (PT for short, VT for short) is an instrument for transforming Voltage, and has a basic structure similar to a Transformer, and also has two windings, one of which is called a primary winding and the other of which is called a secondary winding. The purpose of voltage transformer transformation is mainly to supply measuring instruments and relay protection devices, to measure the voltage, power and electric energy of the line, or to protect valuable equipment in the line in case of line failureThe capacity of the voltage transformer is very small, generally only a few volt-amperes and dozens of volt-amperes, and the maximum capacity of the voltage transformer is not more than one thousand volt-amperes. In this embodiment, the first terminal of the voltage transformer is connected to the variable resistance unit RpIs connected with the first end of the voltage transformer, and the second end of the voltage transformer is connected with an object R to be measuredXIs connected to realize the connection of the voltage transformer and the variable resistance unit RpAnd an object to be measured RXThereby obtaining the load on the variable resistance unit R through the collection of the voltage transformerpAnd an object to be measured RXThe magnitude of the voltage on.
In the present embodiment, the current collecting unit T1A current transformer may be included. The current transformer principle is an instrument for measuring by converting a large primary side current into a small secondary side current according to the electromagnetic induction principle. The primary winding of the transformer has few turns and is connected in series in a circuit of current to be measured, so that the transformer usually has all current of the circuit flowing through, and the secondary winding has more turns and is connected in series in a measuring instrument and a protection circuit. When the current transformer works, a secondary loop of the current transformer is always closed, so that the impedance of a coil connected in series with a measuring instrument and a protection loop is very small, and the working state of the current transformer is close to a short circuit, so that the collection of the flowing current amount is realized under the condition of not influencing a circuit.
In this embodiment, the power supply further includes a rectifier and a voltage stabilizing capacitor C, an input end of the rectifier is connected to the power supply, and an output end of the rectifier is connected to the current collecting unit T1First end of, object to be measured RXIs connected to the second end of the first housing.
Rectifier (rectifier) rectifier can be made of vacuum tube, ignition tube, solid silicon semiconductor diode, mercury arc, etc. it is a device for converting alternating current into stable direct current, and can eliminate noise interference in current and stabilize output voltage, and can be used for power supply device and detecting radio signal, etc.. The voltage stabilizing capacitor C mainly functions to filter out alternating current, so that direct current output by the rectifier is more stable. In this embodiment, by setting the rectifier to input a stable direct current and setting the voltage stabilizing capacitor C to further filter an alternating current in the current, the stability of power supply to the test loop can be effectively ensured, and the reliability of the measurement result is improved.
Example two
Fig. 2 is a flowchart of a resistance measurement method according to a second embodiment of the present invention, where the present embodiment is applicable to testing the dc resistance of the coil-type device and the spacer device in the substation or the loop resistance of the circuit, and the method may be executed by a resistance measurement device, and specifically includes the following steps:
step 210, setting an access resistance value of a variable resistance unit of the resistance measurer;
the resistance value of the variable resistance unit is adjustable, and the resistance value of the variable resistance unit, which is specifically connected to a working circuit of the resistance measurer, can be directly controlled and set.
Alternatively, the structure of the variable resistance unit may be various, and the variable resistance unit may be a digital potentiometer, for example. A Digital Potentiometer (also called Digital control programmable resistor) is a new type CMOS (Complementary Metal Oxide Semiconductor) Digital and analog mixed signal processing integrated circuit which replaces the traditional mechanical Potentiometer (analog Potentiometer), and the Digital Potentiometer can adopt a Digital control mode to adjust the resistance value. The variable resistance unit may have other structures, and the structural form and specific principle thereof are well known in the art, and the present invention is not limited thereto.
And step 220, acquiring a current signal sent by a current acquisition unit of the resistance measurer and a voltage signal sent by a voltage acquisition unit of the resistance measurer in the working process of the resistance measurer.
In the resistance measurer, a single-flow acquisition unit is connected with an object to be measured in series, and a voltage acquisition unit is connected with the object to be measured and a variable resistance unit in parallel. The current collecting unit can be used for measuring the current flowing through the object to be measured, and the voltage collecting unit can be used for collecting the voltage loaded on the object to be measured and the variable resistance unit.
And step 230, determining the resistance value of the object to be detected based on the access resistance value, the current signal and the voltage signal.
According to ohm's law, the total resistance value of the variable resistance unit and the object to be measured can be obtained by calculating the ratio of the voltage signal to the current signal, and then the resistance value of the object to be measured can be obtained by subtracting the access resistance value of the variable resistance unit from the total resistance value. In this embodiment, because the variable resistance unit is arranged inside the resistance measuring device, the access resistance of the variable resistance unit to the resistance measuring device is adjustable, the resistance of the measuring circuit inside the resistance measuring device can be adjusted by adjusting the resistance of the variable resistance unit, so that the overall resistance of the measuring circuit of the resistance measuring device is changed, the damping time constant of the measuring circuit is effectively increased, the time of induced current attenuation is shortened, the data is accelerated to be stable, the testing time is effectively shortened, and the obtained data is more efficient and reliable.
EXAMPLE III
Fig. 3 is a flowchart of a resistance measurement method according to a third embodiment of the present invention, which is embodied on the basis of the third embodiment, and includes the following steps:
and 310, acquiring a working gear selected by a user, wherein the working gear is used for distinguishing different types of objects to be detected.
In this embodiment, different operating ranges are set according to different objects to be measured, and the access resistance values of the variable resistance units of the corresponding resistance measuring devices are set corresponding to the different operating ranges. When a user accesses the object to be measured into the resistance measurer, different working gears are selected according to the type of the object to be measured, so that the operation control unit of the resistance measurer controls the access resistance value of the variable resistance unit to make corresponding adjustment.
And 320, inquiring a value set corresponding to the working gear to serve as an access resistance value of the variable resistance unit of the resistance measurer, wherein the value is positively correlated with the working gear.
The corresponding relation between the working gear and the access resistance value of the variable resistance unit is stored in the memory inside the resistance measurer, the access resistance value of the variable resistance unit can be obtained by inquiring the numerical value of the selected working gear, the access resistance value of the variable resistance unit accessed to the measuring loop of the resistance measurer is further controlled through the working gear, corresponding adjustment is carried out on different types of objects to be measured, and the application range of the resistance measurer is widened.
For example, as shown in table 1, the operating ranges of five different objects to be measured are set, and each object to be measured corresponds to a resistance value range with different size. When an object to be tested is connected to the resistance measurer, the connection resistance value of the variable resistance unit can be selected according to the working gear corresponding to the object to be tested, and then the resistance value adjustment of the measuring loop inside the resistance measurer is effectively changed, so that the overall resistance value of the measuring loop of the resistance measurer is changed, the damping time constant of the measuring loop is effectively increased, the time of induced current attenuation is shortened, the data is accelerated to be stable, the testing time is effectively shortened, and the obtained data is more efficient and reliable.
TABLE 1
And step 330, setting the variable resistance unit according to the access resistance value.
The variable resistance unit and the setting of the access resistance value thereto are technical means commonly used by those skilled in the art and will not be described in detail herein.
And 340, acquiring a current signal sent by a current acquisition unit of the resistance measurer and a voltage signal sent by a voltage acquisition unit of the resistance measurer in the working process of the resistance measurer.
And step 350, sequencing the current signals and the voltage signals according to the acquisition time.
When an object to be measured is connected into the resistance measuring device for resistance measurement, the inductance effect of the closed coil winding inside the object to be measured enables the closed coil winding inside the object to be measured to generate induced current after the measurement loop of the resistance measuring device is switched on during actual measurement, so that current and voltage in the measurement loop are unstable, current signals and voltage signals acquired by the current acquisition unit and the voltage acquisition unit need to be continuously acquired, and data reliability during testing is guaranteed.
And step 360, calculating the reference resistance value of the object to be measured at the corresponding time based on the access resistance value, the current signal and the voltage signal.
Specifically, the reference resistance value can be calculated by the following formula:
wherein R isTnFor reference resistance, UTnTo correspond to the voltage signal at the moment, ITnFor current signals at corresponding times, RpTo switch in the resistance.
Step 370, calculating the ratio of the difference value between two adjacent reference resistance values to the reference resistance value at the previous time according to the sequence of the acquisition time;
if the ratio is smaller than or equal to the threshold value, taking the reference resistance value as the resistance value of the object to be detected;
and if the ratio is larger than the preset threshold, returning to execute the calculation of the ratio of the difference value between two adjacent reference resistance values to the reference resistance value at the previous time according to the sequence of the acquisition time.
By calculating the ratio of the difference value between two adjacent reference resistance values to the reference resistance value at the previous time, the deviation between the two adjacent reference values can be determined, and whether the error range of the reference resistance value obtained at the corresponding time and the actual resistance value of the object to be measured meets the requirement or not is further judged, so that the relatively accurate measured resistance value is obtained.
Specifically, the ratio α of the difference between two adjacent reference resistances to the reference resistance at the previous time can be calculated by the following formula:
optionally, the threshold value is 0.01%, that is, α is not more than 0.001%.
And 390, outputting the resistance value of the object to be detected to an instrument display screen.
Example four
Fig. 4 is a structural diagram of a resistance measuring apparatus according to a fourth embodiment of the present invention, which can execute the resistance measuring method according to the foregoing embodiment, specifically, the apparatus includes:
a setting module 401, configured to set an access resistance value of a variable resistance unit of a resistance measuring device;
the acquisition module 402 is used for acquiring a current signal sent by a current acquisition unit of the resistance measurer and a voltage signal sent by a voltage acquisition unit of the resistance measurer in the working process of the resistance measurer;
and a calculating module 403, configured to determine a resistance value of the object to be measured based on the access resistance value, the current signal, and the voltage signal.
The setting module 401 includes:
the device comprises an acquisition unit, a judgment unit and a control unit, wherein the acquisition unit is used for acquiring a working gear selected by a user, and the working gear is used for distinguishing different types of objects to be detected;
the inquiring unit is used for inquiring a value set corresponding to the working gear, the value is used as an access resistance value of the variable resistance unit of the resistance measurer, and the value is positively correlated with the working gear;
and the setting unit is used for setting the variable resistance unit according to the access resistance value.
The calculation module 403 includes:
the sorting unit is used for sorting the current signals and the voltage signals according to the acquisition time;
the first calculation unit is used for calculating the reference resistance value of the object to be measured at the corresponding time based on the access resistance value, the current signal and the voltage signal;
the first calculating unit is used for calculating the ratio of the difference value between two adjacent reference resistance values to the reference resistance value at the previous time according to the sequence of the acquisition time;
the comparison unit is used for comparing the ratio with a preset threshold value;
if the ratio is smaller than or equal to a preset threshold value, taking the reference resistance value as the resistance value of the object to be detected;
and if the ratio is larger than the preset threshold, returning to execute the calculation of the ratio of the difference value between two adjacent reference resistance values to the reference resistance value at the previous time according to the sequence of the acquisition time.
EXAMPLE five
Fig. 5 is a block diagram of a resistance measuring apparatus according to a fifth embodiment of the present invention, as shown in fig. 5, the apparatus includes a processor 510, a memory 520, an input device 530, and an output device 540; the number of the processors 510 in the device may be one or more, and one processor 510 is taken as an example in fig. 5; the processor 510, the memory 520, the input device 530 and the output device 540 in the device/terminal/server may be connected by a bus or other means, and the connection by the bus is exemplified in fig. 5.
The memory 510 is a computer-readable storage medium, and can be used for storing software programs, computer-executable programs, and modules, such as program instructions/modules corresponding to the resistance measurement method in the embodiment of the present invention (for example, the setting module 401, the acquisition module 402, and the calculation module 403 in the resistance measurement apparatus). The processor 510 executes software programs, instructions and modules stored in the memory 520 to perform various functional applications of the device and data processing, i.e., to implement the resistance measurement method described above.
The memory can mainly comprise a program storage area and a data storage area, wherein the program storage area can store an operating system and an application program required by at least one function; the storage data area may store data created according to the use of the terminal, and the like. Further, the memory may include high speed random access memory, and may also include non-volatile memory, such as at least one magnetic disk storage device, flash memory device, or other non-volatile solid state storage device. In some examples, the memory may further include memory located remotely from the processor, and these remote memories may be connected to the device over a network. Examples of such networks include, but are not limited to, the internet, intranets, local area networks, mobile communication networks, and combinations thereof.
The input device 530 may be used to receive the collected current signal and voltage signal. The output device 540 can be used to set the variable resistance unit and output the measured resistance value of the object to be measured to the instrument display.
EXAMPLE six
An embodiment of the present invention further provides a storage medium containing computer-executable instructions, where the storage medium stores a computer program, and when the computer program is executed by a processor, the computer program implements a method for measuring resistance, where the method includes:
setting the access resistance value of a variable resistance unit of the resistance measurer;
collecting a current signal sent by a current collecting unit of the resistance measurer and a voltage signal sent by a voltage collecting unit of the resistance measurer in the working process of the resistance measurer;
and determining the resistance value of the object to be detected based on the access resistance value, the current signal and the voltage signal.
Of course, the storage medium provided by the embodiment of the present invention contains computer-executable instructions, and the computer-executable instructions are not limited to the operations of the method described above, and may also execute the relevant operations in the resistance measurement method provided by any embodiment of the present invention.
From the above description of the embodiments, it is obvious for those skilled in the art that the present invention can be implemented by software and necessary general hardware, and certainly, can also be implemented by hardware, but the former is a better embodiment in many cases. Based on such understanding, the technical solutions of the present invention may be embodied in the form of a software product, which can be stored in a computer-readable storage medium, such as a floppy disk, a Read-Only Memory (ROM), a Random Access Memory (RAM), a FLASH Memory (FLASH), a hard disk or an optical disk of a computer, and includes several instructions for enabling a computer device (which may be a personal computer, a server, or a network device) to execute the methods according to the embodiments of the present invention.
It should be noted that, in the embodiment of the resistance measuring apparatus, the included units and modules are only divided according to functional logic, but are not limited to the above division as long as the corresponding functions can be realized; in addition, specific names of the functional units are only for convenience of distinguishing from each other, and are not used for limiting the protection scope of the present invention.
It is to be noted that the foregoing is only illustrative of the preferred embodiments of the present invention and the technical principles employed. It will be understood by those skilled in the art that the present invention is not limited to the particular embodiments described herein, but is capable of various obvious changes, rearrangements and substitutions as will now become apparent to those skilled in the art without departing from the scope of the invention. Therefore, although the present invention has been described in greater detail by the above embodiments, the present invention is not limited to the above embodiments, and may include other equivalent embodiments without departing from the spirit of the present invention, and the scope of the present invention is determined by the scope of the appended claims.
Claims (10)
1. A resistance measurer is characterized by comprising a current acquisition unit, a voltage acquisition unit, a variable resistance unit and an operation control unit, wherein the operation control unit is used for setting an access resistance value of the variable resistance unit and calculating a resistance value of an object to be measured, a first end of the current acquisition unit is accessed with a power supply voltage, a second end of the current acquisition unit is connected with a first end of the variable resistance unit, a second end of the variable resistance unit is connected with a first end of the object to be measured, a second end of the object to be measured is accessed with the power supply voltage, a first end of the voltage acquisition unit is connected with the first end of the variable resistance unit, a second end of the voltage acquisition unit is connected with the second end of the object to be measured, and an input end of the operation control unit is connected with the current acquisition unit and the voltage acquisition unit, and the output end of the operation control unit is connected with the control end of the variable resistance unit.
2. The resistance measurer according to claim 1, wherein the voltage acquisition unit includes a voltage transformer, a first end of the voltage transformer is connected to a first end of the variable resistance unit, and a second end of the voltage transformer is connected to a second end of the object to be measured.
3. The resistance measurer according to claim 1, further comprising a rectifier and a voltage stabilizing capacitor, wherein an input end of the rectifier is connected to a power supply, and an output end of the rectifier is connected to the first end of the current collecting unit and the second end of the object to be measured.
4. A method of measuring resistance, comprising:
setting the access resistance value of a variable resistance unit of the resistance measurer;
acquiring a current signal sent by a current acquisition unit of the resistance measurer and a voltage signal sent by a voltage acquisition unit of the resistance measurer in the working process of the resistance measurer;
and determining the resistance value of the object to be detected based on the access resistance value, the current signal and the voltage signal.
5. The resistance measuring method according to claim 4, wherein the setting of the connection resistance value of the variable resistance unit of the resistance measuring device comprises:
acquiring a working gear selected by a user, wherein the working gear is used for distinguishing different types of objects to be detected;
inquiring a numerical value set corresponding to the working gear to serve as an access resistance value of a variable resistance unit of the resistance measurer, wherein the numerical value is positively correlated with the working gear;
and setting the variable resistance unit according to the access resistance value.
6. The method of claim 4, wherein the determining the resistance value of the object to be measured based on the access resistance value, the current signal and the voltage signal comprises:
sorting the current signals and the voltage signals according to acquisition time;
calculating a reference resistance value of the object to be measured at a corresponding time based on the access resistance value, the current signal and the voltage signal;
calculating the ratio of the difference value between two adjacent reference resistance values to the reference resistance value at the previous time according to the sequence of the acquisition time;
if the ratio is smaller than or equal to a preset threshold value, taking the reference resistance value as the resistance value of the object to be detected;
and if the ratio is larger than a preset threshold, returning to execute the calculation of the ratio of the difference value between two adjacent reference resistance values to the reference resistance value at the previous time according to the sequence of the acquisition time.
7. The resistance measurement method according to claim 6, wherein the reference resistance value is calculated by the following formula:
wherein R isTnIs the reference resistance value, UTnFor the voltage signal at the corresponding time, ITnFor the current signal at the corresponding instant, RpIs the access resistance value.
8. A resistance measuring device, comprising:
the setting module is used for setting the access resistance value of the variable resistance unit of the resistance measurer;
the acquisition module is used for acquiring a current signal sent by a current acquisition unit of the resistance measurer and a voltage signal sent by a voltage acquisition unit of the resistance measurer in the working process of the resistance measurer;
and the calculation module is used for determining the resistance value of the object to be detected based on the access resistance value, the current signal and the voltage signal.
9. A resistance measurement device, the device comprising:
one or more processors;
a storage device for storing one or more programs,
when executed by the one or more processors, cause the one or more processors to implement the resistance measurement method of any of claims 4-7.
10. A computer-readable storage medium, on which a computer program is stored, which program, when being executed by a processor, carries out the resistance measurement method according to any one of claims 4 to 7.
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