CN114460376A - Loop impedance detection method, loop impedance detection circuit, computer device and storage medium - Google Patents
Loop impedance detection method, loop impedance detection circuit, computer device and storage medium Download PDFInfo
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Abstract
The application relates to a loop impedance detection method, a circuit, a computer device, a storage medium and a computer program product. The method comprises the following steps: acquiring a resistance value and an inductance value in the loop impedance detection circuit; the loop impedance detection circuit comprises a pulse generation circuit, a leakage current protection device and an impedance detection device which are sequentially connected, wherein the pulse emission time of the pulse generation circuit is shorter than the protection action triggering time of the leakage current protection device; determining a target impedance value corresponding to the loop impedance detection circuit according to the resistance value and the inductance value; and determining whether the loop impedance detection circuit meets the safety requirement according to the target impedance value. By adopting the method, the impedance test of the ground fault loop can be realized in a low-voltage power distribution system with the residual current protection device.
Description
Technical Field
The present application relates to the field of power technologies, and in particular, to a loop impedance detection method, a loop impedance detection circuit, a computer device, a storage medium, and a computer program product.
Background
In a low-voltage distribution system, ground fault loop impedance testing is the basis for fully ensuring the safety of people and electrical equipment, and whether loop impedance is qualified or not can be evaluated through the ground fault loop impedance testing, so that the situation that when the low-voltage distribution system has ground fault, a residual current protection device in the low-voltage distribution system can be triggered to generate protection action is ensured, and the personal safety of a user is ensured.
Conventionally, during the process of performing the ground fault loop impedance test, unbalanced current is generated in the residual current protection device, so that the residual current protection device generates protection misoperation; however, if the ground fault loop impedance test is performed after the residual current protection device is removed, the low-voltage power distribution system can lose the protection measures, and the risk of performing the ground fault loop impedance test is increased. Thus, conventional methods do not enable ground fault loop impedance testing in low voltage power distribution systems that include residual current protection devices.
Disclosure of Invention
In view of the above, it is desirable to provide a loop impedance detection method, a circuit, a computer device, a computer readable storage medium and a computer program product, which can implement a ground fault loop impedance test in a low voltage power distribution system including a residual current protection device.
In a first aspect, the present application provides a loop impedance detection method. The method comprises the following steps:
acquiring a resistance value and an inductance value in the loop impedance detection circuit; the loop impedance detection circuit comprises a pulse generation circuit, a leakage current protection device and an impedance detection device which are connected in sequence, wherein the pulse emission time of the pulse generation circuit is shorter than the protection action trigger time of the leakage current protection device; determining a target impedance value corresponding to the loop impedance detection circuit according to the resistance value and the inductance value; and determining whether the loop impedance detection circuit meets the safety requirement according to the target impedance value.
In one embodiment, determining a target impedance value corresponding to the loop impedance detection circuit according to the resistance value and the inductance value includes:
performing mathematical operation processing on the resistance value and the inductance value to determine a high-frequency impedance value; and performing mathematical operation processing on the high-frequency impedance value to determine a target impedance value.
In one embodiment, the mathematical operation processing of the high frequency impedance value to determine the target impedance value comprises:
and performing fast Fourier transform processing and spectrum analysis processing on the high-frequency impedance value to determine a target impedance value.
In one embodiment, determining whether the loop impedance detection circuit meets a safety requirement based on the target impedance value comprises:
and judging whether the target impedance value is smaller than a preset impedance threshold value or not, and determining whether the loop impedance detection circuit meets the safety requirement or not according to the judgment result.
In one embodiment, determining whether the loop impedance detection circuit meets the safety requirement according to the judgment result comprises:
and if the target impedance value is smaller than the impedance threshold value, determining that the loop impedance detection circuit meets the safety requirement.
In a second aspect, the present application further provides a loop impedance detection circuit. The leakage current protection circuit comprises a pulse generation circuit, a leakage current protection device and an impedance detection device which are connected in sequence;
a pulse generating circuit for generating a pulse current or a pulse voltage; the pulse emission time of the pulse generation circuit is shorter than the protection action trigger time of the leakage current protection device;
a leakage current protection device for cutting off a load in the loop impedance detection circuit when the loop impedance detection circuit is in fault;
the impedance detection device is used for acquiring a resistance value and an inductance value in the loop impedance detection circuit and determining a target impedance value corresponding to the loop impedance detection circuit according to the resistance value and the inductance value; and determining whether the loop impedance detection circuit meets the safety requirement according to the target impedance value.
In one embodiment, the pulse generating circuit comprises an adjustable capacitor, an adjustable resistor and an adjustable inductor, and the pulse transmitting time is determined according to the value of the adjustable capacitor, the value of the adjustable resistor and the value of the adjustable inductor.
In a third aspect, the present application also provides a computer device. The computer device comprises a memory storing a computer program and a processor implementing the method steps in any of the embodiments of the first aspect described above when executing the computer program.
In a fourth aspect, the present application further provides a computer-readable storage medium. The computer-readable storage medium having stored thereon a computer program which, when being executed by a processor, carries out the method steps of any of the embodiments of the first aspect described above.
In a fifth aspect, the present application further provides a computer program product. The computer program product comprising a computer program that when executed by a processor performs the method steps of any of the embodiments of the first aspect described above.
The loop impedance detection method, the loop impedance detection circuit, the computer device, the storage medium and the computer program product are used for detecting the resistance value and the inductance value in the loop impedance detection circuit by acquiring the resistance value and the inductance value; the loop impedance detection circuit comprises a pulse generation circuit, a leakage current protection device and an impedance detection device which are connected in sequence, wherein the pulse emission time of the pulse generation circuit is shorter than the protection action trigger time of the leakage current protection device; determining a target impedance value corresponding to the loop impedance detection circuit according to the resistance value and the inductance value; and determining whether the loop impedance detection circuit meets the safety requirement according to the target impedance value. In the technical scheme provided by the embodiment of the application, the loop impedance test is carried out by generating pulse current or pulse voltage through the pulse generating circuit, because the generated pulse has corresponding pulse time, and the leakage current protection device in the loop impedance detection circuit generates protection action only after reaching the protection action triggering time after passing through the pulse current, when the pulse emission time of the pulse generating circuit is lower than the protection action triggering time of the leakage current protection device, the leakage current protection device has not yet reached the protection action triggering time, the generated pulse current has passed through the leakage current protection device, thereby preventing the leakage current protection device from generating protection misoperation even if passing large current, ensuring the normal operation of subsequent loop impedance test, furthermore, the impedance test of the ground fault loop can be carried out in a low-voltage distribution system with a residual current protection device.
Drawings
FIG. 1 is a diagram illustrating an internal structure of a computer device according to an embodiment;
FIG. 2 is a schematic flow chart of a method for loop impedance detection according to an embodiment;
FIG. 3 is a block diagram of an embodiment of a loop impedance detection circuit;
FIG. 4 is a schematic flow chart illustrating the determination of a target impedance value in one embodiment;
FIG. 5 is a circuit architecture diagram of loop impedance detection in one embodiment;
FIG. 6 is a circuit schematic of loop impedance detection in one embodiment;
FIG. 7 is a schematic diagram of a high frequency pulse generating circuit in one embodiment.
Detailed Description
In order to make the objects, technical solutions and advantages of the present application more apparent, the present application is described in further detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the present application and are not intended to limit the present application.
In the related art, during the process of testing the impedance of a ground fault loop in a low-voltage power distribution system, unbalanced current can be generated in a residual current protection device, so that the residual current protection device generates protection misoperation; however, if the ground fault loop impedance test is performed after the residual current protection device is removed, the low-voltage power distribution system can lose the protection measures, and the risk of performing the ground fault loop impedance test is increased. Thus, conventional methods do not enable ground fault loop impedance testing in low voltage power distribution systems that include residual current protection devices. In order to realize the ground fault loop impedance test in a low-voltage power distribution system with a residual current protection device, the traditional method can also adopt a small current (less than 30mA) for testing, and the residual current protection device can not generate protection misoperation when passing the small current less than 30mA, but the small current does not accord with the actual condition of the low-voltage power distribution system, so that the loop impedance value obtained by the ground fault loop impedance test has low precision and poor reliability. Therefore, the present application provides a new loop impedance detection method to solve the drawbacks of the prior art.
The loop impedance detection method provided by the application can be applied to an impedance detection device, the impedance detection device comprises an intelligent processing module, the intelligent processing module can calculate a target impedance value corresponding to the loop impedance detection circuit, the intelligent processing module is a module with an operation function, and can be a server or a terminal, wherein the server can be a server or a server cluster consisting of a plurality of servers, the loop impedance detection method is not particularly limited in this embodiment, and the terminal can be but not limited to various personal computers, notebook computers, smart phones, tablet computers and portable wearable devices.
Taking a computer device as an example of a terminal, fig. 1 shows a block diagram of a terminal, which, as shown in fig. 1, includes a processor, a memory, a communication interface, a display screen, and an input device connected through a system bus. Wherein the processor of the computer device is configured to provide computing and control capabilities. The memory of the computer device comprises a nonvolatile storage medium and an internal memory. The non-volatile storage medium stores an operating system and a computer program. The internal memory provides an environment for the operation of an operating system and computer programs in the non-volatile storage medium. The communication interface of the computer device is used for carrying out wired or wireless communication with an external terminal, and the wireless communication can be realized through WIFI, a mobile cellular network, NFC (near field communication) or other technologies. The computer program is executed by a processor to implement a loop impedance detection method. The display screen of the computer equipment can be a liquid crystal display screen or an electronic ink display screen, and the input device of the computer equipment can be a touch layer covered on the display screen, a key, a track ball or a touch pad arranged on the shell of the computer equipment, an external keyboard, a touch pad or a mouse and the like.
It will be appreciated by those skilled in the art that the configuration shown in fig. 1 is a block diagram of only a portion of the configuration relevant to the present solution and does not constitute a limitation on the terminal to which the present solution is applied, alternatively the terminal may include more or less components than shown in the figures, or combine certain components, or have a different arrangement of components.
In one embodiment, as shown in fig. 2, which shows a flowchart of loop impedance detection provided by the embodiment of the present application, the method may include the following steps:
The resistance value and the inductance value in the loop impedance detection circuit are resistance values and inductance values in a loop formed in a low-voltage power distribution system, the resistance values and the inductance values are parameters which change along with current in the loop, and the resistance values and the inductance values can be acquired through corresponding acquisition devices. The loop impedance detection circuit may include a pulse generation circuit, a leakage current protection device, and an impedance detection device, which are connected in sequence, specifically as shown in fig. 3, where the pulse generation circuit is a circuit for generating a pulse current or a pulse voltage, and the leakage current protection device is a device for cutting off a load in the loop impedance detection circuit when the loop impedance detection circuit has a fault; the impedance detection device is a circuit for calculating a corresponding target impedance value from a resistance value and an inductance value in the acquisition loop impedance detection circuit.
The pulse emission time of the pulse generation circuit is the pulse duration of the generated pulse, including the wave head time and the wave tail time, and the protection action triggering time of the leakage current protection device is the time between the passing of a large current in the leakage current protection device and the generation of the protection action. The pulse emitting time of the pulse generating circuit can be changed by adjusting the parameter values of related components in the pulse generating circuit, and the related components can be resistors, capacitors, inductors and the like in the pulse generating circuit. The pulse emission time may be shorter than the protection action trigger time of the leakage current protection device, or may be much shorter than the protection action trigger time of the leakage current protection device, which is not specifically limited in this embodiment.
And 240, determining a target impedance value corresponding to the loop impedance detection circuit according to the resistance value and the inductance value.
According to the obtained resistance value and the obtained inductance value, calculating to obtain a corresponding target impedance value according to the relation between the loop impedance and the resistance value and the inductance value; the target impedance value may be obtained by performing mathematical operation on the loop impedance value determined from the resistance value and the inductance value. For example, the resistance value and the inductance value are collected under the high-frequency pulse source, and then the high-frequency loop impedance value determined according to the resistance value and the inductance value can be subjected to spectrum analysis and then converted into a target impedance value under the power frequency.
And step 260, determining whether the loop impedance detection circuit meets the safety requirement according to the target impedance value.
When loop impedance detection is performed, whether a loop impedance detection circuit meets safety requirements or not can be judged through a target impedance value obtained through calculation, and specifically whether a loop in a low-voltage power distribution system meets the safety requirements or not is judged. When the loop impedance meets the preset condition, namely the loop impedance is qualified, if the loop fails, the leakage current protection device can normally generate corresponding protection actions, so that the user load is cut off to ensure the personal safety of a user. Therefore, whether the loop impedance detection circuit meets the safety requirement may be determined by comparing the determined target impedance value with a preset threshold, and the target impedance value may be compared with the preset threshold by difference, quotient, or the like, which is not limited in this embodiment.
In this embodiment, the resistance value and the inductance value in the loop impedance detection circuit are obtained; the loop impedance detection circuit comprises a pulse generation circuit, a leakage current protection device and an impedance detection device which are connected in sequence, wherein the pulse emission time of the pulse generation circuit is shorter than the protection action trigger time of the leakage current protection device; determining a target impedance value corresponding to the loop impedance detection circuit according to the resistance value and the inductance value; and determining whether the loop impedance detection circuit meets the safety requirement according to the target impedance value. The loop impedance test is carried out by generating pulse current or pulse voltage through a pulse generating circuit, and because the generated pulse has corresponding pulse time, the leakage current protection device in the loop impedance detection circuit generates protection action after reaching the protection action triggering time after passing through the pulse current, when the pulse emission time of the pulse generating circuit is lower than the protection action triggering time of the leakage current protection device, the leakage current protection device has not yet reached the protection action triggering time, the generated pulse current has passed through the leakage current protection device, thereby preventing the leakage current protection device from generating protection misoperation even if passing large current, ensuring the normal operation of subsequent loop impedance test, furthermore, the impedance test of the ground fault loop can be carried out in a low-voltage distribution system with a residual current protection device.
In one embodiment, as shown in fig. 4, which illustrates a flow chart of loop impedance detection provided by the embodiments of the present application, specifically, a possible process for determining a target impedance value, the method may include the following steps:
and step 420, performing mathematical operation on the resistance value and the inductance value to determine a high-frequency impedance value.
And 440, performing mathematical operation on the high-frequency impedance value to determine a target impedance value.
The pulse generating circuit can be a high-frequency pulse generating circuit, so that the obtained resistance value and the obtained inductance value are values under a high-frequency pulse source, and after the resistance value and the inductance value are obtained, the resistance value and the inductance value can be subjected to mathematical operation processing according to a formula (1) by combining the collected pulse current and voltage, and then the high-frequency impedance value V is obtained through calculation.
Wherein, R (i) and L (i) respectively represent that the resistance and the inductance change along with the change of the current i.
After the high-frequency impedance value is obtained through calculation, mathematical operation processing can be carried out on the high-frequency impedance value, and therefore the target impedance value is determined. The mathematical operation processing may be a process of converting a high-frequency impedance value into a power-frequency impedance value after the frequency spectrum analysis processing, may be realized by means of fourier transform processing, fast fourier transform processing, or the like, or may be realized by means of other manners. Alternatively, when the target impedance value is determined by performing mathematical operation on the high-frequency impedance value, the target impedance value may be determined by performing fast fourier transform processing and spectrum analysis processing on the high-frequency impedance value. Among them, the fast fourier transform is a mathematical tool for calculating a discrete fourier transform for a sampled signal, and can approximate the result of the fourier transform. The impedance components under each frequency spectrum can be obtained by performing fast Fourier transform processing on the high-frequency impedance value, so that the target impedance value under the power frequency can be determined.
In this embodiment, a high-frequency impedance value is determined by performing mathematical operation on the resistance value and the inductance value, and a target impedance value is determined by performing mathematical operation on the high-frequency impedance value. The method is simple and easy to realize, and can ensure the reliability and accuracy of loop impedance detection; furthermore, the high-frequency impedance value is subjected to mathematical operation processing by adopting fast Fourier transform, so that a target impedance value is determined, the calculation amount is small, and the efficiency of loop impedance detection is improved.
In one embodiment, determining whether the loop impedance detection circuit meets a safety requirement based on the target impedance value comprises: and judging whether the target impedance value is smaller than a preset impedance threshold value or not, and determining whether the loop impedance detection circuit meets the safety requirement or not according to the judgment result.
The preset impedance threshold may be set according to the actual condition of the loop of the low-voltage power distribution system, for example, the preset impedance threshold may be set to 80% of the standard impedance value, and it is determined whether the loop impedance detection circuit meets the safety requirement by determining whether the target impedance value is less than 80% of the standard impedance value. In actual use, the loop impedance value cannot be too large, and if the loop impedance value is too large, when the loop fails, the current flowing through the leakage current protection device is very small, so that the leakage current protection device cannot normally generate protection actions, and further safety accidents are caused.
Thus, if the target impedance value is less than the impedance threshold, the loop impedance detection circuit is determined to meet the safety requirement, e.g., if the target impedance value is less than 80% of the standard impedance value, the loop impedance detection circuit is determined to meet the safety requirement, whereas if the target impedance value is greater than 80% of the standard impedance value, the loop impedance detection circuit is determined not to meet the safety requirement.
In this embodiment, the safety of the loop can be quickly detected by determining whether the target impedance value is smaller than the preset impedance threshold value and determining whether the loop impedance detection circuit meets the safety requirement according to the determination result, so that the loop impedance detection efficiency is improved.
In one embodiment, a loop impedance detection circuit is provided, which comprises a pulse generation circuit, a leakage current protection device and an impedance detection device which are connected in sequence; a pulse generating circuit for generating a pulse current or a pulse voltage; the pulse emission time of the pulse generation circuit is shorter than the protection action trigger time of the leakage current protection device; a leakage current protection device for cutting off a load in the loop impedance detection circuit when the loop impedance detection circuit is in fault; the impedance detection device is used for acquiring a resistance value and an inductance value in the loop impedance detection circuit and determining a target impedance value corresponding to the loop impedance detection circuit according to the resistance value and the inductance value; and determining whether the loop impedance detection circuit meets the safety requirement according to the target impedance value.
As shown in fig. 5 and 6, in the loop impedance detection circuit, the pulse generation circuit and the impedance detection device are connected in the loop of the low-voltage distribution system, in fig. 5, a loop impedance detection instrument used during loop impedance detection Is connected to one phase terminal, for example, L1, and a terminal conductor (PE) of the protection device, the instrument includes the pulse generation circuit and the impedance detection device, a leakage current protection device in the test loop Is tested together with the loop, CT Is a current transformer, Is a current transformer secondary current, I Δ Is an unbalanced current, L1, L2, L3 are three-phase four-wire system neutral wires, N Is a neutral wire, and PE Is a ground wire. In FIG. 6, the high-frequency loop impedance Z includes the distribution-network-side impedance ZnAnd a user side impedance Zi，Z0For the internal impedance of the loop impedance meter, the high-frequency power supply in fig. 6 employs the high-frequency pulse generating circuit shown in fig. 7.
In the pulse generation circuit shown in fig. 7, the left 220V power supply is used to charge the capacitor, after the switch is closed, to generate the fast pulses required by the wave front. The 200V power supply on the right side is controlled by a delay switch, so that the control of wave tail waveforms is realized. The pulse generating circuit further includes an adjustable capacitor, an adjustable resistor, and an adjustable inductor, and the pulse transmission time is determined according to the value of the adjustable capacitor, the value of the adjustable resistor, and the value of the adjustable inductor, and may be specifically determined according to a physical relationship between the time and the capacitor, the resistor, and the inductor, which are well known to those skilled in the art and will not be described herein again. The adjustable capacitor is a 20uF capacitor in FIG. 7, the capacitor can be replaced, and the broken line between the pulse wave head control and the pulse wave tail control in FIG. 7 only indicates that the second half is a wave tail control circuit.
In this embodiment, the loop impedance detection circuit includes a pulse generation circuit, a leakage current protection device and an impedance detection device connected in sequence, the loop impedance detection circuit generates a pulse current or a pulse voltage to perform a loop impedance test, since the generated pulse has a corresponding pulse time, and the leakage current protection device in the loop impedance detection circuit generates a protection action after reaching a protection action trigger time after passing the pulse current, when the pulse emission time of the pulse generation circuit is less than the protection action trigger time of the leakage current protection device, the leakage current protection device has not reached the protection action trigger time, and the generated pulse current has passed through the leakage current protection device, so that the leakage current protection device does not generate a protection malfunction even passing a large current, and the normal operation of the subsequent loop impedance test is ensured, furthermore, the impedance test of the ground fault loop can be carried out in a low-voltage distribution system with a residual current protection device.
In one embodiment, the loop impedance detection instrument may be an integrated device including a fast charging module, a storage battery power supply module, a current generation device, an intelligent processor module, a measurement input module, an output port, and a display panel. The quick charging module is provided with a quick charging module which supports quick charging under 380V and 220V voltages, and the charging module is integrated in the handheld measuring box; the storage battery pack module is a high-density lithium iron phosphate battery, can support loop resistance measurement for about 100 times when the capacity is 72 ampere, is provided with an independent battery management system, has the battery service life requirement of more than or equal to 8 years, and is integrated in a handheld measuring box; the current generating device is a high-frequency pulse generating circuit, the rising edge (wave head) and wave tail time of the high-frequency pulse generator are adjustable, the high-frequency pulse generation of 5-10 us of rising edge can be realized, the time of the short pulse is far longer than the action time of the leakage current protection device, the misoperation of the loop leakage current protection device can be effectively avoided, the pulse generating module can generate 5A pulse current and ensure the measurement precision, the circuit is provided with a special insulating isolation cover plate, and an insulating monitoring module is sealed and fixedly integrated in a handheld measuring box, wherein the insulating isolation cover plate isolates the high-distribution pulse generating circuit from other circuits and avoids the influence of electromagnetic interference on adjacent circuits; the intelligent processing module is internally provided with an A/D conversion module, an alternating current, an alternating voltage input port, a signal output port and an operation module, realizes the operation processing function after the alternating voltage and current signals are input, is used for calculating the high-frequency loop impedance under the high-frequency current and voltage signals, then converts the high-frequency impedance into the loop impedance under the power frequency through fast Fourier transform and feeds back an output result, and is integrated in the handheld measuring box; the measurement input module has high-precision and large-bandwidth current and voltage measurement functions and is used for measuring input and output high-frequency current and voltage signals, namely high-frequency current or voltage of a live wire and a shell or a PE wire in the figure 1, and the measurement input module is integrated in the handheld measurement box; the output port is made of low-impedance copper wire and wrapped by PVC (polyvinyl chloride) insulating material to be used as the output connection wire of the high-frequency pulse generator; the display panel has an acousto-optic alarm function, emits acousto-optic alarm when the equipment has an insulation fault or a power failure, and is arranged in the handheld measuring box.
In this embodiment, the fast charging module, the storage battery power supply module, the current generation device, the intelligent processor module, the measurement input module, the output port, the display panel and other modules are all disposed in the handheld measuring box, and the handheld measuring box has high portability.
It should be understood that, although the steps in the flowcharts related to the embodiments as described above are sequentially displayed as indicated by arrows, the steps are not necessarily performed sequentially as indicated by the arrows. The steps are not performed in the exact order shown and described, and may be performed in other orders, unless explicitly stated otherwise. Moreover, at least a part of the steps in the flowcharts related to the embodiments described above may include multiple steps or multiple stages, which are not necessarily performed at the same time, but may be performed at different times, and the execution order of the steps or stages is not necessarily sequential, but may be rotated or alternated with other steps or at least a part of the steps or stages in other steps.
In one embodiment, a computer device is provided, comprising a memory and a processor, the memory having a computer program stored therein, the processor implementing the following steps when executing the computer program:
acquiring a resistance value and an inductance value in the loop impedance detection circuit; the loop impedance detection circuit comprises a pulse generation circuit, a leakage current protection device and an impedance detection device which are connected in sequence, wherein the pulse emission time of the pulse generation circuit is shorter than the protection action trigger time of the leakage current protection device; determining a target impedance value corresponding to the loop impedance detection circuit according to the resistance value and the inductance value; and determining whether the loop impedance detection circuit meets the safety requirement or not according to the target impedance value.
In one embodiment, the processor, when executing the computer program, further performs the steps of:
performing mathematical operation processing on the resistance value and the inductance value to determine a high-frequency impedance value; and performing mathematical operation processing on the high-frequency impedance value to determine a target impedance value.
In one embodiment, the processor, when executing the computer program, further performs the steps of:
and performing fast Fourier transform processing and spectrum analysis processing on the high-frequency impedance value to determine a target impedance value.
In one embodiment, the processor, when executing the computer program, further performs the steps of:
and judging whether the target impedance value is smaller than a preset impedance threshold value or not, and determining whether the loop impedance detection circuit meets the safety requirement or not according to the judgment result.
In one embodiment, the processor, when executing the computer program, further performs the steps of:
and if the target impedance value is smaller than the impedance threshold value, determining that the loop impedance detection circuit meets the safety requirement.
The implementation principle and technical effect of the computer device provided by the embodiment of the present application are similar to those of the method embodiment described above, and are not described herein again.
In one embodiment, a computer-readable storage medium is provided, having a computer program stored thereon, which when executed by a processor, performs the steps of:
acquiring a resistance value and an inductance value in the loop impedance detection circuit; the loop impedance detection circuit comprises a pulse generation circuit, a leakage current protection device and an impedance detection device which are connected in sequence, wherein the pulse emission time of the pulse generation circuit is shorter than the protection action trigger time of the leakage current protection device; determining a target impedance value corresponding to the loop impedance detection circuit according to the resistance value and the inductance value; and determining whether the loop impedance detection circuit meets the safety requirement according to the target impedance value.
In one embodiment, the computer program when executed by the processor further performs the steps of:
performing mathematical operation processing on the resistance value and the inductance value to determine a high-frequency impedance value; and performing mathematical operation processing on the high-frequency impedance value to determine a target impedance value.
In one embodiment, the computer program when executed by the processor further performs the steps of:
and performing fast Fourier transform processing and spectrum analysis processing on the high-frequency impedance value to determine a target impedance value.
In one embodiment, the computer program when executed by the processor further performs the steps of:
and judging whether the target impedance value is smaller than a preset impedance threshold value or not, and determining whether the loop impedance detection circuit meets the safety requirement or not according to the judgment result.
In one embodiment, the computer program when executed by the processor further performs the steps of:
and if the target impedance value is smaller than the impedance threshold value, determining that the loop impedance detection circuit meets the safety requirement.
The implementation principle and technical effect of the computer-readable storage medium provided in this embodiment are similar to those of the above method embodiments, and are not described herein again.
In one embodiment, a computer program product is provided, comprising a computer program which, when executed by a processor, performs the steps of:
acquiring a resistance value and an inductance value in the loop impedance detection circuit; the loop impedance detection circuit comprises a pulse generation circuit, a leakage current protection device and an impedance detection device which are connected in sequence, wherein the pulse emission time of the pulse generation circuit is shorter than the protection action trigger time of the leakage current protection device; determining a target impedance value corresponding to the loop impedance detection circuit according to the resistance value and the inductance value; and determining whether the loop impedance detection circuit meets the safety requirement according to the target impedance value.
In one embodiment, the computer program when executed by the processor further performs the steps of:
performing mathematical operation processing on the resistance value and the inductance value to determine a high-frequency impedance value; and performing mathematical operation processing on the high-frequency impedance value to determine a target impedance value.
In one embodiment, the computer program when executed by the processor further performs the steps of:
and performing fast Fourier transform processing and frequency spectrum analysis processing on the high-frequency impedance value to determine a target impedance value.
In one embodiment, the computer program when executed by the processor further performs the steps of:
and judging whether the target impedance value is smaller than a preset impedance threshold value or not, and determining whether the loop impedance detection circuit meets the safety requirement or not according to the judgment result.
In one embodiment, the computer program when executed by the processor further performs the steps of:
and if the target impedance value is smaller than the impedance threshold value, determining that the loop impedance detection circuit meets the safety requirement.
The computer program product provided in this embodiment has similar implementation principles and technical effects to those of the method embodiments described above, and is not described herein again.
It should be noted that, the user information (including but not limited to user device information, user personal information, etc.) and data (including but not limited to data for analysis, stored data, presented data, etc.) referred to in the present application are information and data authorized by the user or sufficiently authorized by each party.
It will be understood by those skilled in the art that all or part of the processes of the methods of the embodiments described above can be implemented by hardware instructions of a computer program, which can be stored in a non-volatile computer-readable storage medium, and when executed, can include the processes of the embodiments of the methods described above. Any reference to memory, database, or other medium used in the embodiments provided herein may include at least one of non-volatile and volatile memory. The nonvolatile Memory may include Read-Only Memory (ROM), magnetic tape, floppy disk, flash Memory, optical Memory, high-density embedded nonvolatile Memory, resistive Random Access Memory (ReRAM), Magnetic Random Access Memory (MRAM), Ferroelectric Random Access Memory (FRAM), Phase Change Memory (PCM), graphene Memory, and the like. Volatile Memory can include Random Access Memory (RAM), external cache Memory, and the like. By way of illustration and not limitation, RAM can take many forms, such as Static Random Access Memory (SRAM) or Dynamic Random Access Memory (DRAM), among others. The databases referred to in various embodiments provided herein may include at least one of relational and non-relational databases. The non-relational database may include, but is not limited to, a block chain based distributed database, and the like. The processors referred to in the embodiments provided herein may be general purpose processors, central processing units, graphics processors, digital signal processors, programmable logic devices, quantum computing based data processing logic devices, etc., without limitation.
The technical features of the above embodiments can be arbitrarily combined, and for the sake of brevity, all possible combinations of the technical features in the above embodiments are not described, but should be considered as the scope of the present specification as long as there is no contradiction between the combinations of the technical features.
The above-mentioned embodiments only express several embodiments of the present application, and the description thereof is more specific and detailed, but not construed as limiting the scope of the present application. It should be noted that, for a person skilled in the art, several variations and modifications can be made without departing from the concept of the present application, which falls within the scope of protection of the present application. Therefore, the protection scope of the present application shall be subject to the appended claims.
Claims (10)
1. A method of loop impedance detection, the method comprising:
acquiring a resistance value and an inductance value in the loop impedance detection circuit; the loop impedance detection circuit comprises a pulse generation circuit, a leakage current protection device and an impedance detection device which are connected in sequence, wherein the pulse emission time of the pulse generation circuit is shorter than the protection action trigger time of the leakage current protection device;
determining a target impedance value corresponding to the loop impedance detection circuit according to the resistance value and the inductance value;
and determining whether the loop impedance detection circuit meets the safety requirement or not according to the target impedance value.
2. The method of claim 1, wherein determining the target impedance value corresponding to the loop impedance detection circuit according to the resistance value and the inductance value comprises:
performing mathematical operation processing on the resistance value and the inductance value to determine a high-frequency impedance value;
and performing mathematical operation processing on the high-frequency impedance value to determine the target impedance value.
3. The method of claim 2, wherein the mathematically processing the high frequency impedance value to determine the target impedance value comprises:
and performing fast Fourier transform processing and spectrum analysis processing on the high-frequency impedance value to determine the target impedance value.
4. The method of any of claims 1-3, wherein said determining whether the loop impedance detection circuit meets a safety requirement based on the target impedance value comprises:
and judging whether the target impedance value is smaller than a preset impedance threshold value or not, and determining whether the loop impedance detection circuit meets the safety requirement or not according to the judgment result.
5. The method of claim 4, wherein determining whether the loop impedance detection circuit meets a safety requirement according to the determination result comprises:
and if the target impedance value is smaller than the impedance threshold value, determining that the loop impedance detection circuit meets the safety requirement.
6. A loop impedance detection circuit is characterized by comprising a pulse generation circuit, a leakage current protection device and an impedance detection device which are connected in sequence;
the pulse generating circuit is used for generating pulse current or pulse voltage; the pulse emission time of the pulse generation circuit is shorter than the protection action trigger time of the leakage current protection device;
the leakage current protection device is used for cutting off a load in the loop impedance detection circuit when the loop impedance detection circuit has a fault;
the impedance detection device is used for acquiring a resistance value and an inductance value in the loop impedance detection circuit and determining a target impedance value corresponding to the loop impedance detection circuit according to the resistance value and the inductance value; and determining whether the loop impedance detection circuit meets the safety requirement according to the target impedance value.
7. The circuit of claim 6, wherein the pulse generation circuit comprises an adjustable capacitor, an adjustable resistor, and an adjustable inductor, and wherein the pulse transmission time is a time determined according to a value of the adjustable capacitor, a value of the adjustable resistor, and a value of the adjustable inductor.
8. A computer device comprising a memory and a processor, the memory storing a computer program, characterized in that the processor, when executing the computer program, implements the steps of the method of any of claims 1 to 5.
9. A computer-readable storage medium, on which a computer program is stored, which, when being executed by a processor, carries out the steps of the method of any one of claims 1 to 5.
10. A computer program product comprising a computer program, characterized in that the computer program realizes the steps of the method of any one of claims 1 to 5 when executed by a processor.
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115695103A (en) * | 2022-11-21 | 2023-02-03 | 深圳数马电子技术有限公司 | Impedance self-adaption method and device, computer equipment and storage medium |
| CN115859900A (en) * | 2022-12-02 | 2023-03-28 | 浙江凌骁能源科技有限公司 | Method, apparatus, computer device and storage medium for determining heating film wiring |
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2021
- 2021-12-30 CN CN202111657136.6A patent/CN114460376A/en active Pending
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115695103A (en) * | 2022-11-21 | 2023-02-03 | 深圳数马电子技术有限公司 | Impedance self-adaption method and device, computer equipment and storage medium |
| CN115695103B (en) * | 2022-11-21 | 2024-05-17 | 深圳数马电子技术有限公司 | Impedance self-adaption method, device, computer equipment and storage medium |
| CN115859900A (en) * | 2022-12-02 | 2023-03-28 | 浙江凌骁能源科技有限公司 | Method, apparatus, computer device and storage medium for determining heating film wiring |
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