CN114441838A - Voltage measurement method and device and voltage sensor - Google Patents
Voltage measurement method and device and voltage sensor Download PDFInfo
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Abstract
The application relates to a voltage measuring method, a voltage measuring device and a voltage sensor. The voltage sensor comprises a first detection end, a second detection end, a measurement capacitor and a controllable switch. The voltage measuring method comprises the following steps that a first detection end is used for being coupled with a line to be measured, a second detection end is used for being coupled with a zero line, a measuring capacitor and a controllable switch are connected in parallel and then connected in series between the first detection end and the second detection end, and the voltage measuring method comprises the following steps: controlling the controllable switch to be conducted, and acquiring the amplitude of the first current; the first current is the current between the first detection end and the second detection end when the controllable switch is conducted; controlling the controllable switch to be switched off, and acquiring the amplitude of the second current; the second current is the current between the first detection end and the second detection end when the controllable switch is switched off; and obtaining the voltage of the line to be measured according to the amplitude of the first current, the amplitude of the second current and the capacitance value of the measuring capacitor. The method can realize non-invasive low-power consumption measurement of the voltage and has economy and safety.
Description
Technical Field
The present disclosure relates to the field of power measurement technologies, and in particular, to a voltage measurement method and apparatus, a voltage sensor, and a storage medium.
Background
In recent years, as power systems are continuously developed towards intellectualization, informatization and automation, higher requirements are put on power equipment, and further improvement and updating of traditional power equipment are urgently needed. Monitoring is a key technology for realizing power grid intellectualization, and a voltage transformer is used as key power equipment for voltage measurement and plays an important role in the aspects of power system state evaluation, scheduling control, relay protection and the like. The traditional voltage transformer is mainly an electromagnetic voltage transformer and has the defects of large volume, heavy weight, potential safety hazard in operation and the like. Along with the construction of a novel electric power system, the voltage sensor is required to be changed from an original electromagnetic voltage transformer into an intelligent, networked, low-power-consumption and digitized non-invasive voltage transformer.
The traditional voltage measurement method has the problem of high power consumption.
Disclosure of Invention
In view of the above, it is necessary to provide a voltage measuring method and apparatus, a voltage sensor, and a storage medium with low power consumption.
In a first aspect, an embodiment of the present invention provides a voltage measurement method, configured to control a voltage sensor to perform voltage measurement on a line to be measured, where the voltage sensor includes a first detection end, a second detection end, a measurement capacitor, and a controllable switch, the first detection end is configured to be coupled with the line to be measured, the second detection end is configured to be coupled with a zero line, the measurement capacitor and the controllable switch are connected in parallel and then connected in series between the first detection end and the second detection end, and the voltage measurement method includes: controlling the controllable switch to be conducted, and acquiring the amplitude of a first current; the first current is a current between the first detection end and the second detection end when the controllable switch is switched on; controlling the controllable switch to be switched off, and acquiring the amplitude of a second current; the second current is a current between the first detection end and the second detection end when the controllable switch is switched off; and obtaining the voltage of the line to be measured according to the amplitude of the first current, the amplitude of the second current and the capacitance value of the measuring capacitor.
In one embodiment, the step of obtaining the voltage of the line to be measured according to the amplitude of the first current, the amplitude of the second current, and the capacitance of the measurement capacitor includes:
inputting the amplitude of the first current, the amplitude of the second current and the capacitance of the measuring capacitor into a voltage calculation model to obtain the voltage of the line to be measured, wherein the voltage calculation model comprises:
wherein,U s is the voltage of the line under test,I s1is the magnitude of the first current and,I s2is the magnitude of the second current and,Cfor the capacitance value of the measuring capacitance,fthe frequency of the electrical signal in the line to be tested.
In one embodiment, the voltage calculation model is constructed by the following steps: establishing a first corresponding relation between the amplitude of the first current, the capacitance value of the equivalent coupling capacitor and the voltage of the line to be tested; the equivalent coupling capacitor is formed by connecting a first coupling capacitor formed by coupling the first detection end with a circuit to be detected and a second coupling capacitor formed by coupling the second detection end with the zero line in series; establishing a second corresponding relation among the amplitude of the second current, the capacitance value of the equivalent coupling capacitor, the capacitance value of the measuring capacitor and the voltage of the line to be measured; and carrying out elimination operation on the first corresponding relation and the second corresponding relation, and eliminating the capacitance value of the equivalent coupling capacitor so as to obtain the voltage calculation model.
In one embodiment, the first corresponding relationship includes:
wherein,U s is the voltage of the line to be tested,I s1is the magnitude of the first current and,fis the frequency of the electrical signal in the line under test,C eq is the capacitance value of the equivalent coupling capacitance.
In one embodiment, the second correspondence relationship includes:
wherein,U s is the voltage of the line to be tested,I s2is the magnitude of the second current and,fis the frequency of the electrical signal in the line under test,Cfor the capacitance value of the measuring capacitance,C eq is the capacitance value of the equivalent coupling capacitance.
In a second aspect, an embodiment of the present invention provides a voltage sensor, including: the first detection end is used for being coupled with a line to be detected; the second detection end is used for being coupled with a zero line; the first branch circuit is connected between the first detection end and the second detection end, the first branch circuit comprises a current detection module, a controllable switch and a measurement capacitor, the controllable switch is connected with the measurement capacitor in parallel, the current detection module is connected with the controllable switch and the measurement capacitor in series, and the current detection module is used for detecting the amplitude of the current of the first branch circuit; and the control module is connected with the controllable switch and the current detection module and comprises a memory and a processor, wherein the memory stores a computer program, and the processor realizes the steps of the voltage measurement method when executing the computer program.
In one embodiment, the first detection terminal comprises a first metal plate, and the second detection terminal comprises a second metal plate; the first end of the first metal polar plate is physically connected with the circuit to be tested so as to be coupled with the circuit to be tested, and the second end of the first metal polar plate is connected with the first end of the second metal polar plate through the first branch circuit; and the second end of the second metal polar plate is physically connected with the zero line.
In one embodiment, the control module comprises a single chip microcomputer.
In a third aspect, an embodiment of the present invention provides a voltage measurement device, configured to control a voltage sensor to perform voltage measurement on a line to be measured, where the voltage sensor includes a first detection end, a second detection end, a measurement capacitor, and a controllable switch, the first detection end is configured to couple with the line to be measured, the second detection end is configured to couple with a zero line, the measurement capacitor and the controllable switch are connected in parallel and then connected in series between the first detection end and the second detection end, and the voltage measurement device includes: the first acquisition module is used for controlling the conduction of the controllable switch and acquiring the amplitude of a first current; the first current is a current between the first detection end and the second detection end when the controllable switch is switched on; the second acquisition module is used for controlling the controllable switch to be switched off and acquiring the amplitude of a second current; the second current is a current between the first detection end and the second detection end when the controllable switch is switched off; and the voltage calculation module is used for obtaining the voltage of the line to be measured according to the amplitude of the first current, the amplitude of the second current and the capacitance value of the measuring capacitor.
In a fourth aspect, an embodiment of the present invention provides a computer-readable storage medium, on which a computer program is stored, where the computer program, when executed by a processor, implements the steps of the current testing method described above.
Based on any of the above embodiments, by controlling the on and off of the controllable switch, the loops of the first detection end and the second detection end of the voltage sensor are different, two working conditions are formed, and the voltage of the line to be measured can be obtained based on the amplitude of the current under the two working conditions and the capacitance value of the capacitor in the voltage sensor. Because the power consumption required by current acquisition and voltage calculation is very low, and no equipment which needs extra power consumption is arranged in the voltage sensor, the method can realize non-invasive low-power consumption measurement of the voltage, and has economy and safety and great practical significance.
Drawings
FIG. 1 is a diagram illustrating an exemplary voltage measurement method;
FIG. 2 is a schematic flow chart of a voltage measurement method according to an embodiment;
FIG. 3 is a schematic flow diagram illustrating the construction of a voltage calculation module in one embodiment;
FIG. 4 is an equivalent circuit diagram of an embodiment of the controllable switch when it is turned on;
FIG. 5 is an equivalent circuit diagram of the controllable switch when it is turned off in one embodiment;
FIG. 6 is a schematic diagram of a voltage sensor 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.
The inventor researches the problem of large power consumption in the background art, and finds that the conventional voltage sensor needs to generate a reference signal to detect the information related to the coupling capacitance in the line. And the reference signal source has high energy consumption when in operation, and the power consumption requirement of the voltage sensor is difficult to meet.
In order to solve the above problem, an embodiment of the present invention provides a voltage measurement method for controlling a voltage sensor to measure a voltage of a line to be measured. Referring to fig. 1, the voltage sensor includes a first detection terminal 11, a second detection terminal 13, a measurement capacitor 15 and a controllable switch 17. The first detection end 11 is used for being coupled with a line to be detected, and the second detection end 13 is used for being coupled with a zero line. The measuring capacitor 15 and the controllable switch 17 are connected in parallel and then connected in series between the first detection terminal 11 and the second detection terminal 13. The traditional voltage sensor is an invasive measurement, and a voltage detection point needs to be reserved on a line to be detected or an insulating layer of the line to be detected needs to be damaged so as to detect the voltage of a conductor in the line to be detected. In this embodiment, the first detection end 11 is electrically coupled to the line to be detected through the first coupling capacitor, and the second detection end 13 is electrically coupled to the zero line through the second coupling capacitor, so that the voltage of the line to be detected can act on a loop formed between the first detection end 11 and the second detection end 13 without damaging an insulating layer of the line to be detected based on the electrical coupling relationship. Referring to fig. 2, the voltage measurement method includes steps S202 to S206.
S202, the controllable switch 17 is controlled to be conducted, and the amplitude of the first current is obtained.
The first current is a current between the first detection terminal 11 and the second detection terminal 13 when the controllable switch 17 is turned on. When the controllable switch 17 is turned on, the measurement capacitor 15 is short-circuited by the controllable switch 17, the main elements of the loop between the first detection end 11 and the second detection end 13 are a first coupling capacitor and a second coupling capacitor, and the amplitude of the first current is related to the voltage of the line to be measured, the capacitance value of the first coupling capacitor and the capacitance value of the second coupling capacitor.
And S204, controlling the controllable switch 17 to be switched off, and acquiring the amplitude of the second current.
The second current is the current between the first detection terminal 11 and the second detection terminal 13 when the controllable switch 17 is turned off. When the controllable switch 17 is turned on, the measuring capacitor 15 is connected in series to a loop between the first detecting terminal 11 and the second detecting terminal 13, main components of the loop between the first detecting terminal 11 and the second detecting terminal 13 are a first coupling capacitor, a second coupling capacitor and the measuring capacitor 15, and at this time, the amplitude of the second current is related to the voltage of the line to be measured, the capacitance value of the first coupling capacitor, the capacitance value of the second coupling capacitor and the capacitance value of the measuring capacitor 15. In addition, the order of executing steps S204 and S202 is not limited in this embodiment, and step S202 may be executed first, or step S204 may be executed first.
And S206, obtaining the voltage of the line to be measured according to the amplitude of the first current, the amplitude of the second current and the capacitance value of the measuring capacitor 15.
The capacitance values of the first coupling capacitor and the second coupling capacitor are respectively related to the size, shape, material and the like of the first detection end 11 and the second detection end 13, and the capacitance values may change with the retirement of time, which is very difficult to measure. However, when the first current and the second current are analyzed and modeled, it is found that the two current amplitudes are related to the capacitance value of the first coupling capacitor and the capacitance value of the second coupling capacitor, the common term can be eliminated, the voltage calculation model obtained after the elimination only has the amplitude of the first current, the amplitude of the second current, the capacitance value of the measurement capacitor 15 and the voltage of the line to be measured, and the amplitude of the first current and the amplitude of the second current are obtained in steps S202 and S204, while the capacitance value of the measurement capacitor 15 can be tested in advance when the voltage sensor is designed, and the voltage of the line to be measured can be obtained by substituting the known quantities into the voltage calculation model.
Based on the voltage measurement method in this embodiment, the controllable switch 17 is controlled to be turned on and off, so that the loops of the first detection end 11 and the second detection end 13 of the voltage sensor are different, two working conditions are formed, and the voltage of the line to be measured can be obtained based on the amplitude of the current and the capacitance of the capacitor in the voltage sensor under the two working conditions. Because the power consumption required by current acquisition and voltage calculation is very low, and no equipment which needs extra power consumption is arranged in the voltage sensor, the method can realize non-invasive low-power consumption measurement of the voltage, and has economy and safety and great practical significance.
In one embodiment, the step of obtaining the voltage of the line to be measured according to the amplitude of the first current, the amplitude of the second current, and the capacitance of the measurement capacitor 15 includes:
inputting the amplitude of the first current, the amplitude of the second current and the capacitance of the measuring capacitor 15 into a voltage calculation model to obtain the voltage of the line to be measured, wherein the voltage calculation model comprises the following steps:
wherein,U s is the voltage of the line to be tested,I s1is the magnitude of the first current and,I s2is the magnitude of the second current and,Cin order to measure the capacitance value of the capacitor 15,fis the frequency of the electrical signal in the line under test. The frequency of the electrical signal in the line to be tested is a known quantity and can be obtained according to the power system specification of the area where the line to be tested is located, and the frequency of the electrical signal in the common line to be tested is 50 Hz.
In one embodiment, referring to fig. 3, the process of constructing the voltage calculation model includes steps S302 to S306.
S302, a first corresponding relation between the amplitude of the first current, the capacitance value of the equivalent coupling capacitor and the voltage of the line to be tested is established.
When the controllable switch 17 is turned on, the equivalent coupling capacitor is formed by connecting a first coupling capacitor formed by coupling the first detection end 11 with the line to be detected and a second coupling capacitor formed by coupling the second detection end 13 with the zero line in series, and the loop between the first detection end 11 and the second detection end 13 can be equivalent to the circuit shown in fig. 4. In some embodiments, referring to the circuit of fig. 4, a first correspondence may be established according to kirchhoff and ohm's law as follows:
wherein,U s is the voltage of the line to be tested,I s1is the magnitude of the first current and,fis the frequency of the electrical signal in the line under test,C eq is the capacitance value of the equivalent coupling capacitance. The equivalent coupling capacitance is the equivalent of the first coupling capacitance and the second coupling capacitance connected in series, so that
。
S304, establishing a second corresponding relation between the amplitude of the second current, the capacitance value of the equivalent coupling capacitor, the capacitance value of the measuring capacitor 15 and the voltage of the line to be measured.
The circuit between the first detection terminal 11 and the second detection terminal 13 when the controllable switch 17 is turned off can be equivalent to the circuit shown in fig. 5. In some embodiments, referring to the circuit of FIG. 5, a second correspondence may be established based on kirchhoff and ohm's law
Wherein,U s is the voltage of the line to be tested,I s2is the magnitude of the second current and,fis the frequency of the electrical signal in the line under test,Cin order to measure the capacitance value of the capacitor 15,C eq is the capacitance value of the equivalent coupling capacitance.
And S306, carrying out elimination operation on the first corresponding relation and the second corresponding relation, and eliminating the capacitance value of the equivalent coupling capacitor to obtain a voltage calculation model.
The main idea of the elimination operation is as follows: and transforming the first corresponding relation or the second corresponding relation, independently placing the capacitance value of the equivalent coupling capacitor on one side of the equal sign, and substituting the transformed corresponding relation into the other corresponding relation, so that the common term of the capacitance value of the equivalent coupling capacitor can be eliminated, and the expression in the voltage calculation model is obtained.
It should be understood that, although the steps in the flowcharts related to the embodiments are shown in sequence as indicated by the arrows, the steps are not necessarily executed in sequence 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 above embodiments 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 order of performing the steps or stages is not necessarily sequential, but may be performed alternately or alternately with other steps or at least a part of the steps or stages in other steps.
Referring to fig. 6, an embodiment of the invention provides a voltage sensor. The voltage sensor comprises a first detection terminal 11, a second detection terminal 13, a measurement capacitor 15, a controllable switch 17, a current detection module 19 and a control module 21. Wherein the first branch comprises a current detection module 19, a controllable switch 17 and a measurement capacitance 15. The first detection terminal 11 is used for coupling with a line to be detected. The second detection terminal 13 is used for coupling with the neutral wire. The first branch is connected between the first detection end and the second detection end. The controllable switch 17 is connected in parallel with the measuring capacitor 15, and the current detection module 19 is connected in series with the controllable switch 17 and the measuring capacitor 15. The current detection module 19 is configured to detect a magnitude of the current of the first branch. Although the branch formed by connecting the measuring capacitors 15 in parallel is connected to the first detecting terminal 11 and the current detecting module 19 is connected to the second detecting terminal 13 in fig. 6, the connection order of the two parts may be exchanged, and the present embodiment is not limited thereto. The control module 21 is connected to the controllable switch 17 and the current detection module 19, and includes a memory and a processor, where the memory stores a computer program, and the processor implements the steps of the voltage measurement method when executing the computer program.
Based on the voltage sensor in this embodiment, by controlling the on/off of the controllable switch 17, the loops of the first detection end 11 and the second detection end 13 of the voltage sensor are different, two working conditions are formed, and the voltage of the line to be detected can be obtained based on the amplitude of the current under the two working conditions and the capacitance of the capacitor in the voltage sensor. Because the power consumption required by current acquisition and voltage calculation is very low, and no equipment which needs extra power consumption is arranged in the voltage sensor, the method can realize non-invasive low-power consumption measurement of the voltage, and has economy and safety and great practical significance.
In one embodiment, the first sensing terminal 11 includes a first metal plate, and the second sensing terminal 13 includes a second metal plate. The first end of the first metal polar plate is physically connected with the circuit to be tested so as to be coupled with the circuit to be tested. Specifically, the first end of the first metal plate can be tightly attached to the insulating layer of the circuit to be tested, and a first coupling capacitor can be formed between the first metal plate and the circuit to be tested. The second end of the first metal polar plate is connected with the first end of the second metal polar plate through a first branch. The second end of the second metal polar plate is physically connected with the zero line. The second end of the second metal polar plate can be tightly attached to the insulating layer of the zero line, and a second coupling capacitor can be formed between the second metal polar plate and the line to be tested.
In one embodiment, the controllable switch 17 may be a transistor, a MOS transistor, a thyristor, an electromagnetic relay, or the like.
In one embodiment, the current detection module 19 may be a sampling resistor, or may measure the current by a method such as current-voltage conversion of an operational amplifier.
In one embodiment, the control module 21 comprises a single-chip microcomputer.
Based on the same inventive concept, the embodiment of the present application further provides a voltage measurement apparatus for implementing the voltage measurement method. The implementation scheme for solving the problem provided by the device is similar to the implementation scheme recorded in the method, so the specific limitations in one or more embodiments of the voltage measurement device provided below can be referred to the limitations of the voltage measurement method in the foregoing, and are not described herein again.
The embodiment of the invention provides a voltage measuring device which is used for controlling a voltage sensor to measure the voltage of a line to be measured. Referring to fig. 1, the voltage sensor includes a first detection end 11, a second detection end 13, a measurement capacitor 15 and a controllable switch 17, the first detection end 11 is used for coupling with a line to be measured, the second detection end 13 is used for coupling with a zero line, the measurement capacitor 15 and the controllable switch 17 are connected in parallel and then connected in series between the first detection end 11 and the second detection end 13, and the voltage measurement device includes a first acquisition module, a second acquisition module and a voltage calculation module. The first acquisition module is used for controlling the conduction of the controllable switch 17 and acquiring the amplitude of the first current. The first current is a current between the first detection terminal 11 and the second detection terminal 13 when the controllable switch 17 is turned on. The second acquisition module is used for controlling the controllable switch 17 to be switched off and acquiring the amplitude of the second current. The second current is the current between the first detection terminal 11 and the second detection terminal 13 when the controllable switch 17 is turned off. And the voltage calculation module is used for obtaining the voltage of the line to be measured according to the amplitude of the first current, the amplitude of the second current and the capacitance value of the measuring capacitor 15.
Based on the voltage measuring device in this embodiment, by controlling the on/off of the controllable switch 17, the loops of the first detection end 11 and the second detection end 13 of the voltage sensor are different, two working conditions are formed, and the voltage of the line to be measured can be obtained based on the amplitude of the current under the two working conditions and the capacitance of the capacitor in the voltage sensor. Because the power consumption required by current acquisition and voltage calculation is very low, and no equipment which needs extra power consumption is arranged in the voltage sensor, the method can realize the non-invasive low-power consumption measurement of the voltage, and has economy and safety, thereby having greater practical significance.
In one embodiment, the voltage measurement device further comprises a model building module. The model building module comprises a first corresponding relation building unit, a second corresponding relation building unit and an elimination operation unit. The first corresponding relation establishing unit is used for establishing a first corresponding relation between the amplitude of the first current, the capacitance value of the equivalent coupling capacitor and the voltage of the line to be tested. The second corresponding relation establishing unit is used for establishing a second corresponding relation between the amplitude of the second current, the capacitance value of the equivalent coupling capacitor, the capacitance value of the measuring capacitor 15 and the voltage of the line to be measured. The elimination unit is used for carrying out elimination operation on the first corresponding relation and the second corresponding relation and eliminating the capacitance value of the equivalent coupling capacitor so as to obtain a voltage calculation model.
The various modules in the voltage measuring device described above may be implemented in whole or in part by software, hardware, and combinations thereof. The modules can be embedded in a hardware form or independent from a processor in the computer device, and can also be stored in a memory in the computer device in a software form, so that the processor can call and execute operations corresponding to the modules.
An embodiment of the present invention 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 steps of the voltage measurement method described above.
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 a Read-Only Memory (ROM), a magnetic tape, a floppy disk, a flash Memory, an optical Memory, a high-density embedded nonvolatile Memory, a resistive Random Access Memory (ReRAM), a Magnetic Random Access Memory (MRAM), a Ferroelectric Random Access Memory (FRAM), a Phase Change Memory (PCM), a 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, and these are all 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 voltage measurement method is characterized in that the voltage measurement method is used for controlling a voltage sensor to carry out voltage measurement on a line to be measured, the voltage sensor comprises a first detection end, a second detection end, a measurement capacitor and a controllable switch, the first detection end is used for being coupled with the line to be measured, the second detection end is used for being coupled with a zero line, the measurement capacitor and the controllable switch are connected in parallel and then connected in series between the first detection end and the second detection end, and the voltage measurement method comprises the following steps:
controlling the controllable switch to be conducted, and acquiring the amplitude of a first current; the first current is a current between the first detection end and the second detection end when the controllable switch is switched on;
controlling the controllable switch to be switched off, and acquiring the amplitude of a second current; the second current is a current between the first detection end and the second detection end when the controllable switch is switched off;
and obtaining the voltage of the line to be measured according to the amplitude of the first current, the amplitude of the second current and the capacitance value of the measuring capacitor.
2. The voltage measurement method according to claim 1, wherein the step of obtaining the voltage of the line to be measured according to the amplitude of the first current, the amplitude of the second current and the capacitance of the measurement capacitor comprises:
inputting the amplitude of the first current, the amplitude of the second current and the capacitance value of the measuring capacitor into a voltage calculation model to obtain the voltage of the line to be measured;
the voltage calculation model includes:
wherein,U s is the voltage of the line to be tested,I s1is the magnitude of the first current and,I s2is the magnitude of the second current and,Cfor the capacitance value of the measuring capacitance,fthe frequency of the electrical signal in the line to be tested.
3. The voltage measurement method according to claim 2, wherein the voltage calculation model is constructed by:
establishing a first corresponding relation between the amplitude of the first current and the capacitance value of the equivalent coupling capacitor and the voltage of the line to be tested; the equivalent coupling capacitor is formed by connecting a first coupling capacitor formed by coupling the first detection end with a line to be detected and a second coupling capacitor formed by coupling the second detection end with the zero line in series;
establishing a second corresponding relation among the amplitude of the second current, the capacitance value of the equivalent coupling capacitor, the capacitance value of the measuring capacitor and the voltage of the line to be measured;
and carrying out elimination operation on the first corresponding relation and the second corresponding relation, and eliminating the capacitance value of the equivalent coupling capacitor so as to obtain the voltage calculation model.
4. The voltage measurement method of claim 3, wherein the first correspondence comprises:
wherein,U s is the voltage of the line to be tested,I s1is the magnitude of the first current and,fis the frequency of the electrical signal in the line under test,C eq is the capacitance value of the equivalent coupling capacitance.
5. The voltage measurement method according to claim 3, wherein the second correspondence includes:
wherein,U s is the voltage of the line under test,I s2is the magnitude of the second current and,fis the frequency of the electrical signal in the line under test,Cfor the capacitance value of the measuring capacitance,C eq is the capacitance value of the equivalent coupling capacitance.
6. A voltage sensor, comprising:
the first detection end is used for being coupled with a line to be detected;
the second detection end is used for being coupled with a zero line;
the first branch circuit is connected between the first detection end and the second detection end, the first branch circuit comprises a current detection module, a controllable switch and a measurement capacitor, the controllable switch is connected with the measurement capacitor in parallel, the current detection module is connected with the controllable switch and the measurement capacitor in series, and the current detection module is used for detecting the amplitude of the current of the first branch circuit;
a control module connected to the controllable switch and the current detection module, and comprising a memory and a processor, wherein the memory stores a computer program, and the processor implements the steps of the voltage measurement method according to any one of claims 1 to 5 when executing the computer program.
7. The voltage sensor of claim 6, wherein the first sensing terminal comprises a first metal plate and the second sensing terminal comprises a second metal plate;
the first end of the first metal polar plate is physically connected with the circuit to be tested so as to be coupled with the circuit to be tested, and the second end of the first metal polar plate is connected with the first end of the second metal polar plate through the first branch circuit;
and the second end of the second metal polar plate is physically connected with the zero line.
8. The voltage sensor of claim 6, wherein the control module comprises a single-chip microcomputer.
9. The utility model provides a voltage measurement device, its characterized in that for control voltage sensor carries out voltage measurement to the circuit that awaits measuring, voltage sensor includes first sense terminal, second sense terminal, measures electric capacity and controllable switch, first sense terminal be used for with the circuit coupling that awaits measuring, the second sense terminal be used for with zero line coupling, measure electric capacity with controllable switch concatenates after parallelly connected first sense terminal with between the second sense terminal, voltage measurement device includes:
the first acquisition module is used for controlling the conduction of the controllable switch and acquiring the amplitude of a first current; the first current is a current between the first detection end and the second detection end when the controllable switch is switched on;
the second acquisition module is used for controlling the controllable switch to be switched off and acquiring the amplitude of a second current; the second current is a current between the first detection end and the second detection end when the controllable switch is switched off;
and the voltage calculation module is used for obtaining the voltage of the line to be measured according to the amplitude of the first current, the amplitude of the second current and the capacitance value of the measuring capacitor.
10. 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 voltage measurement method according to any one of claims 1 to 5.
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