CN115902377A - Voltage sensor and control method thereof - Google Patents
Voltage sensor and control method thereof Download PDFInfo
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Abstract
The invention discloses a voltage sensor and a control method thereof, wherein the voltage sensor comprises an induction component, a signal processing circuit and a control module, the induction component is in a hollow cylinder shape, the induction component comprises an inner surface, an outer surface, a top surface and a bottom surface, the top surface is in a circular ring shape, the top surface and the bottom surface are in the same shape, the inner surface and the outer surface are both conductors, and the inner surface and the outer surface are arranged in an insulating way; the inner surface of the sensing part is electrically connected with the first input end of the signal processing circuit, the outer surface of the sensing part is electrically connected with the second input end of the signal processing circuit, and the detected conductor penetrates through the sensing part; the output end of the signal processing circuit is electrically connected with the control module. The voltage sensor in the embodiment does not need to contact with a measured conductor, is not destructive to the measured conductor, only comprises the sensing component and the signal processing circuit, is simple in structure and low in cost, and can stably measure in extreme environments such as high temperature.
Description
Technical Field
The invention relates to the technical field of line voltage measurement, in particular to a voltage sensor and a control method thereof.
Background
At present, the mainstream voltage sensors include electromagnetic voltage transformers, capacitive voltage transformers and optical voltage sensors based on the pockels effect. The primary side of an electromagnetic voltage transformer or a capacitor voltage transformer needs to be connected with a charged conductor, and the method belongs to an intrusive measurement method. In a single-phase two-wire line, for example, a two-core cable, it is necessary to electrically connect a measuring device such as an electromagnetic voltage transformer to a line to be measured after peeling off an insulating sheath in order to measure a line voltage. Obviously, this type of installation is destructive and does not offer the advantage of widespread distribution. Although the optical voltage transformer is a non-contact measurement method, it is mainly applied to high voltage measurement, and is high in cost and greatly influenced by the ambient temperature.
Disclosure of Invention
The invention provides a voltage sensor and a control method thereof, which are used for realizing non-contact between the voltage sensor and a measured conductor and have the advantages of simple structure and lower cost.
According to an aspect of the present invention, there is provided a voltage sensor including: the induction component is in a hollow cylindrical shape and comprises an inner surface, an outer surface, a top surface and a bottom surface, the top surface is in a circular ring shape, the top surface and the bottom surface are in the same shape, the inner surface and the outer surface are both conductors, and the inner surface and the outer surface are arranged in an insulating manner;
the inner surface of the induction component is electrically connected with the first input end of the signal processing circuit, the outer surface of the induction component is electrically connected with the second input end of the signal processing circuit, and the detected conductor penetrates through the induction component;
the induction component is used for generating an induction electric signal when the tested conductor is electrified, and the signal processing circuit is used for generating an amplified signal according to the induction electric signal;
the output end of the signal processing circuit is electrically connected with the control module, and the control module is used for determining the voltage of the tested conductor according to the amplified signal.
Optionally, the signal processing circuit includes a first capacitor, a second capacitor, a first resistor, a second resistor, and an amplifier, a first input end of the amplifier is electrically connected to the inner surface of the sensing component, a second input end of the amplifier is electrically connected to the outer surface of the sensing component, and an output end of the amplifier is electrically connected to the control module;
the first end of the first capacitor is electrically connected with the first input end of the amplifier, and the second end of the first capacitor is electrically connected with a measurement grounding point;
a first end of the first resistor is electrically connected with a first input end of the amplifier, and a second end of the first resistor is electrically connected with the measurement grounding point;
a first end of the second capacitor is electrically connected with the second input end of the amplifier, and a second end of the second capacitor is electrically connected with the measurement grounding point;
the first end of the second resistor is electrically connected to the second input terminal of the amplifier, and the second end of the second resistor is electrically connected to the measurement ground point.
Optionally, the resistances of the first resistor and the second resistor are the same, the capacitances of the first capacitor and the second capacitor are the same, and the range of the capacitance of the first capacitor is 10 12 F-9×10 12 F, the product of the resistance value of the first resistor and the capacitance value of the first capacitor, and the likeAt 10.
Optionally, the signal processing circuit further includes a filter capacitor and a filter resistor, a first end of the filter capacitor is electrically connected to the output end of the amplifier, a second end of the filter capacitor is electrically connected to the control module, a first end of the filter resistor is electrically connected to a second end of the filter capacitor, and a second end of the filter resistor is electrically connected to the measurement ground point.
Optionally, the diameter range of the inner circle of the top surface of the sensing part is 55mm to 80mm, and the diameter range of the outer circle of the top surface of the sensing part is 60mm to 85mm.
Optionally, the difference between the radii of the inner circle and the outer circle of the top surface of the sensing part is 10mm-20mm.
Optionally, the length of the sensing component along the current direction of the measured conductor ranges from 50mm to 80mm.
Optionally, the distance between the inner surface of the sensing component and the measured conductor ranges from 3mm to 10mm.
According to another aspect of the present invention, a control method of a voltage sensor is provided, the voltage sensor includes an induction component, a signal processing circuit and a control module, the induction component is in a hollow cylinder shape, the induction component includes an inner surface, an outer surface, a top surface and a bottom surface, the top surface is in a circular ring shape, the top surface and the bottom surface are in the same shape, the inner surface and the outer surface are conductors, and the inner surface and the outer surface are arranged in an insulating manner; the inner surface of the induction component is electrically connected with the first input end of the signal processing circuit, the outer surface of the induction component is electrically connected with the second input end of the signal processing circuit, the detected conductor penetrates through the induction component, and the output end of the signal processing circuit is electrically connected with the control module;
the control method comprises the following steps:
after the tested conductor is electrified, the induction component generates an induction electric signal according to the voltage and the static induction of the tested conductor;
the signal processing circuit generates an amplified signal according to the induced electrical signal;
and the control module determines the voltage of the conductor to be tested according to the amplified signal.
Optionally, the determining, by the control module, the voltage of the detected conductor according to the amplified signal includes:
determining a mapping relation between the voltage of the conductor under test and the induced electrical signal based on Laplace transform;
determining the induced electrical signal according to the amplified signal and the gain of the signal processing circuit;
and determining the voltage of the tested conductor according to the induction electric signal and the mapping relation.
The voltage sensor provided by the invention comprises an induction component, a signal processing circuit and a control module, wherein the induction component is in a hollow cylindrical shape and comprises an inner surface, an outer surface, a top surface and a bottom surface, the top surface is in a circular ring shape, the top surface and the bottom surface are in the same shape, the inner surface and the outer surface are both conductors, and the inner surface and the outer surface are arranged in an insulating way; the inner surface of the sensing part is electrically connected with the first input end of the signal processing circuit, the outer surface of the sensing part is electrically connected with the second input end of the signal processing circuit, and the detected conductor penetrates through the sensing part; the output end of the signal processing circuit is electrically connected with the control module. After the detected conductor penetrates through the induction component and is electrified, the inner surface and the outer surface of the induction component can generate electric signals based on the electrostatic induction principle, namely after the detected conductor is electrified, the induction component generates induction electric signals, and the signal processing circuit amplifies the induction electric signals to generate amplified signals. The induced electrical signal and the voltage of the measured conductor have a mapping relation, and the induced electrical signal and the amplified signal also have a mapping relation, so that the voltage of the measured conductor can be determined after the amplified signal is obtained, and the voltage of the measured conductor can be measured. The voltage sensor in the embodiment does not need to contact with a measured conductor, is not destructive to the measured conductor, only comprises the sensing component and the signal processing circuit, is simple in structure and low in cost, and can stably measure in extreme environments such as high temperature.
It should be understood that the statements in this section do not necessarily identify key or critical features of the embodiments of the present invention, nor do they necessarily limit the scope of the invention. Other features of the present invention will become apparent from the following description.
Drawings
In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings needed to be used in the description of the embodiments will be briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without creative efforts.
Fig. 1 is a schematic structural diagram of a voltage sensor according to an embodiment of the present invention;
fig. 2 is an equivalent circuit diagram of a voltage sensor according to an embodiment of the present invention;
fig. 3 is a graph illustrating an amplitude-frequency characteristic of a voltage sensor according to an embodiment of the present invention;
fig. 4 is a phase-frequency characteristic graph of a voltage sensor according to an embodiment of the present invention;
fig. 5 is a flowchart of a control method of a voltage sensor according to a second embodiment of the present invention.
Detailed Description
In order to make the technical solutions of the present invention better understood, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be obtained by a person skilled in the art without making any creative effort based on the embodiments in the present invention, shall fall within the protection scope of the present invention.
It should be noted that the terms "first," "second," and the like in the description and claims of the present invention and in the drawings described above are used for distinguishing between similar elements and not necessarily for describing a particular sequential or chronological order. It is to be understood that the data so used is interchangeable under appropriate circumstances such that the embodiments of the invention described herein are capable of operation in other sequences than those illustrated or described herein. Furthermore, the terms "comprises," "comprising," and "having," and any variations thereof, are intended to cover a non-exclusive inclusion, such that a process, method, system, article, or apparatus that comprises a list of steps or elements is not necessarily limited to those steps or elements expressly listed, but may include other steps or elements not expressly listed or inherent to such process, method, article, or apparatus.
Example one
Fig. 1 is a schematic structural diagram of a voltage sensor according to an embodiment of the present invention, referring to fig. 1, the voltage sensor includes a sensing component, a signal processing circuit 1 and a control module 2, the sensing component is in a hollow cylinder shape, the sensing component includes an inner surface 31, an outer surface 32, a top surface 33 and a bottom surface, the top surface 33 is in a circular ring shape, the top surface 33 and the bottom surface are in the same shape, both the inner surface 31 and the outer surface 32 are conductors, and the inner surface 31 and the outer surface 32 are arranged in an insulating manner;
the inner surface 31 of the sensing part is electrically connected with the first input end A1 of the signal processing circuit 1, the outer surface 32 of the sensing part is electrically connected with the second input end A2 of the signal processing circuit 1, and the detected conductor 01 penetrates through the sensing part;
the induction component is used for generating an induction electric signal when the tested conductor 01 is electrified, and the signal processing circuit 1 is used for generating an amplified signal according to the induction electric signal;
the output end of the signal processing circuit 1 is electrically connected with the control module 2, and the control module 2 is used for determining the voltage of the detected conductor according to the amplified signal.
The inner surface 31 and the outer surface 32 of the sensing part are both conductors, and may be metal conductors, such as copper sheets, for inducing an electrical signal when the conductor 01 to be tested is electrified. An insulation is provided between the inner surface 31 and the outer surface 32, and, for example, the inner surface 31 and the outer surface 32 may be filled with an insulation material such as an epoxy resin material. The insulating material not only insulates the inner surface 31 and the outer surface 32, but also supports the inner surface 31 and the outer surface 32 against the insulating material, thereby fixing the inner surface 31 and the outer surface 32. The sensing element includes a through hole between the top surface 33 and the bottom surface, and the conductor 01 to be tested is placed in the through hole. The tested conductor can be a single-phase two-wire line comprising a live wire and a zero wire. The signal processing circuit 1 may be a filtering and amplifying circuit, and filters and amplifies the induced electrical signal. The conductor 01 to be tested is the wire, and inside includes the sinle silk be live wire 011 and zero line 012, and the sinle silk outside includes insulating protective sheath to form the protection to the sinle silk.
The working principle of the voltage sensor is as follows: after the conductor 01 to be measured is electrified, based on the principle of electrostatic induction, the conductors such as the inner surface 31 and the outer surface 32 are put into an electric field to generate induced charges so as to electrify the inner surface 31 and the outer surface 32, that is, the induction component generates an induction electrical signal, wherein the induction electrical signal is a voltage signal. The voltage signals of the inner surface 31 and the outer surface 32 are transmitted to the signal processing circuit 1, and are processed to generate an amplified signal. The induced electrical signal and the voltage of the conductor 01 to be tested have a mapping relation, the induced electrical signal and the amplified signal have a mapping relation, the mapping relation between the induced electrical signal and the amplified signal depends on the structure of the signal processing circuit 1, and after the signal processing circuit 1 determines the mapping relation between the induced electrical signal and the amplified signal, the mapping relation between the induced electrical signal and the amplified signal is determined. Therefore, the control module 2 can derive the magnitude of the induced electrical signal according to the output amplified signal, and then determine the magnitude of the voltage of the detected conductor 01 according to the mapping relationship between the induced electrical signal and the voltage of the detected conductor 01 and the induced electrical signal.
The voltage sensor in the embodiment does not need to contact with a measured conductor, is not destructive to the measured conductor, only comprises the sensing component and the signal processing circuit, is simple in structure and low in cost, and can stably measure in extreme environments such as high temperature.
Fig. 2 is an equivalent circuit diagram of a voltage sensor according to an embodiment of the present invention, and referring to fig. 1 and fig. 2, the signal processing circuit 2 includes a first capacitor C 01 A second capacitor C 02 A first resistor R 01 A second resistor R 02 And an amplifier Q1, a first input terminal of the amplifier Q1 being electrically connected to the inner surface 31 of the inductive component, a second input terminal of the amplifier Q1 being electrically connected to the inductive componentThe outer surface 32 is electrically connected, and the output end of the amplifier Q1 is electrically connected with the control module 2;
a first capacitor C 01 Is electrically connected to a first input terminal of the amplifier Q1, a first capacitor C 01 Is electrically connected to the measurement ground GND 1;
a first resistor R 01 Is electrically connected to a first input terminal of the amplifier Q1, a first resistor R 01 Is electrically connected to the measurement ground GND 1;
second capacitor C 02 Is electrically connected to a second input terminal of the amplifier Q1, a second capacitor C 02 Is electrically connected to the measurement ground GND 1;
a second resistor R 02 Is electrically connected to a second input terminal of the amplifier Q1, a second resistor R 02 Is electrically connected to the measurement ground GND 1.
Distributed capacitance exists between the sensing component and the measured conductor 01, and an equivalent circuit diagram of the voltage sensor is drawn according to the distributed capacitance, as shown in fig. 2. Wherein the distributed capacitance is the capacitance formed by the proximity of the sensing component and the tested conductor 01. The distributed capacitance comprises a third capacitance C 0m0 A fourth capacitor C 0m1 A fifth capacitor C 0s1 And a sixth capacitor C 0m2 A seventh capacitor C 0c2 An eighth capacitor C 0g1 And a ninth capacitor C 0g2 Wherein the third capacitor C 0m0 A fourth capacitance C being the capacitance between the inner surface 31 and the outer surface 32 0m1 A fifth capacitance C which is the capacitance between the inner surface 31 and the live line 011 of the conductor 01 under test 0s1 A sixth capacitor C, which is a capacitance between the inner surface 31 and the zero line 012 of the conductor 01 to be measured 0m2 A capacitance of 011 between the outer surface 32 and the live line of the conductor 01 under test, a seventh capacitance C 0c2 Is the capacitance between the outer surface 32 and the zero line 012 of the conductor 01 to be tested, an eighth capacitance C 0g1 For measuring the capacitance between the grounding point GND1 and the live wire 011 of the tested conductor 01, a ninth capacitor C 0g2 The capacitance between the grounding point GND1 and the zero line 012 of the conductor 01 to be measured is measured. It is to be noted that the zero line of the conductor 01 under test is connected to the ground point GND2 under test.
Optionally, a first resistor R 01 And a second resistor R 02 Have the same resistance value, and the first capacitor C 01 And a second capacitor C 02 The capacitance values of (a) are the same. By setting a first resistance R 01 And a second resistor R 02 The same resistance value of the first capacitor C 01 And a second capacitor C 02 The capacitance values of the capacitors are the same, so that the calculation can be simplified, and the analysis is convenient, particularly the following calculation process.
In order to analytically analyze the frequency response of the voltage sensor, the eighth capacitor C is first omitted 0g1 And a ninth capacitor C 0g2 Based on the laplace transform, an induced electrical signal V, which is an electrical signal between the first input terminal A1 and the second input terminal A2 of the signal processing circuit, can be obtained in And the voltage V of the measured conductor ac The relationship between them is:
wherein R is m ＝2R 1 ，C m ＝C m0 +C 1 /2，C xx Is a capacitor C 0xx Capacitance value of R 1 Is a first resistor R 01 Resistance value of C a And C b The expression of (a) is as follows:
amplitude-frequency response expression of the voltage sensor:
phase-frequency response expression of the voltage sensor:
when R is m C b When < 1 >, the induced electric signal V can be converted in And the voltage V of the conductor to be measured ac The function between is simplified as:
When R is m C b > 1, the function can be simplified to:
Therefore, in order to operate the voltage sensor in the self-integration mode, the first capacitor C is provided 01 Has a capacitance value in the range of 10 12 F-9×10 12 F, setting a first resistor R 1 Resistance value of (2) and first capacitor C 01 The product of the capacitance values of (a) is equal to 10. The capacitance values of the distributed capacitors are all in pF level, therefore, a first capacitor C is arranged 01 Has a capacitance value in the range of 10 12 F-9×10 12 After F, C b Is approximately equal to C m ，C m Is approximately equal to C 1 /2, therefore, R m C b ＝2R 1 *C 1 And/2 =10, thereby realizing that the voltage sensor works in a self-integration mode.
To study the eighth capacitance C 0g1 And a ninth capacitor C 0g2 For voltage sensorsAnd (4) influence, performing simulation research by adopting a generalized node analysis method. Finite element method is used to extract the dispersion capacitance parameters of the voltage sensor, illustratively, C under certain installation conditions m0 ＝13.12pF,C m1 ＝1.05pF,C s1 ＝1.10pF,C m2 ＝1.03pF,C s2 ＝1.04pF。
To study the eighth capacitance C 0g1 And a ninth capacitor C 0g2 Influence on the voltage sensor, three types of eighth capacitors C are set 0g1 And a ninth capacitor C 0g2 I.e., 100pF and 1pf,1pf and 100pF, and 0pF. FIG. 3 is a graph showing the amplitude-frequency characteristic of a voltage sensor according to an embodiment of the present invention, and it can be seen from FIG. 3 that an eighth capacitor C is set 0g1 And a ninth capacitor C 0g2 After the capacitance value is obtained, the amplitude-frequency characteristic curve of the voltage sensor is basically a horizontal line, namely the amplitude ratio of the detected conductor voltage to the induced electric signal, namely the voltage division ratio, is a constant. Eighth capacitor C 0g1 And a ninth capacitor C 0g2 The capacitance value of (a) affects the magnitude of the voltage division ratio of the voltage sensor, but once the voltage sensor is fixedly mounted, the voltage division ratio is kept constant.
To study the eighth capacitance C 0g1 And a ninth capacitor C 0g2 The influence on the phase frequency characteristic of the voltage sensor is realized by using the eighth capacitor C in the simulation process 0g1 And a ninth capacitor C 0g2 The capacitance value of (2) is varied in a range of 0pF to 100pF with a step of 1pF. Fig. 4 is a phase-frequency characteristic curve diagram of a voltage sensor according to an embodiment of the present invention, and fig. 4 is a graph of the voltage sensor with a frequency of 50Hz and different eighth capacitances C 0g1 And a ninth capacitor C 0g2 The phase shift of the voltage sensor is less than 0.7 ° as can be seen from fig. 4. As can be seen from the phase-frequency formula of the voltage sensor, the phase shift of the voltage sensor gradually decreases as the frequency increases. When the phase shift of the voltage sensor at 50Hz is less than 1 deg., then at higher frequencies the phase shift is also less than 1 deg.. Thereby demonstrating the eighth capacitance C 0g1 And a ninth capacitor C 0g2 The characteristics that the induced electrical signals of the voltage sensor track the voltage of the measured conductor in phase are not influenced.
To sum up, according to the phase-frequency expression of the voltage sensor, when the frequency is 50Hz, the phase shift amount is 3.14X 10-4rad, and meanwhile, the phase shift gradually decreases as the frequency table increases. Additional introduction of a first electrode R 01 A second resistor R 02 A first capacitor C 01 And a second capacitor C 02 Then, in a certain frequency range, inducing an electric signal V in And the voltage V of the measured conductor ac The phase difference between the two is almost zero, namely the in-phase tracking of the line voltage waveform is realized.
With continued reference to fig. 1, optionally, the signal processing circuit 1 further comprises a filter capacitor C 03 And a filter resistor R 03 Filter capacitor C 03 Is electrically connected with the output end of the amplifier Q1, and a filter capacitor C 03 Is electrically connected with the control module 2, and a filter resistor R 03 First terminal and filter capacitor C 03 Is electrically connected to the second terminal of the filter resistor R 03 Is electrically connected to the measurement ground GND 1.
Filter capacitor C 03 And a filter resistor R 03 And a high-pass filter circuit is formed to filter the influence of interference signals and improve the accuracy of the amplified signals output by the signal processing circuit 1.
With continued reference to fig. 1, optionally, the diameter of the inner circle 331 of the top surface 33 of the sensing member ranges from 55mm to 80mm, and the diameter of the outer circle 332 of the top surface 33 of the sensing member ranges from 60mm to 85mm.
The diameters of the inner circle 331 and the outer circle 332 are not required to be too large, and the measured conductor 01 can be placed normally, so that material waste is caused due to the too large diameter.
With continued reference to fig. 1, the difference in radius between the inner circle 331 and the outer circle 332 of the top surface 33 of the inductive component is optionally in the range of 10mm-20mm. The difference in the radii of inner circle 331 and outer circle 332 characterizes the distance between inner surface 31 and outer surface 32, with the greater the distance, the greater the induced electrical signal. If the distance between the inner surface 31 and the outer surface 32 is too small, the induced electric signal is small, which is not beneficial to measurement, and if the distance between the inner surface 31 and the outer surface 32 is too large, strong external noise can be induced, so that interference is caused to the induced electric signal. Therefore, the difference range of the radiuses of the inner circle 331 and the outer circle 332 is set to be 10mm-20mm, so that the induced electrical signals are not too small, and the influence of external noise is reduced.
With continued reference to fig. 1, the length of the sensing element along the direction of current flow of the conductor 01 being tested may alternatively range from 50mm to 80mm.
The length of the sensing component along the current direction of the detected conductor 01 is too small, so that the electrostatic induction effect is weak, and the generation of an induction electric signal is not facilitated. The length of the sensing part along the current direction of the tested conductor 01 is too large, and the influence of external noise is large. Therefore, the length range of the induction component along the current direction of the tested conductor 01 is 50mm-80mm, so that the normal generation of an induced electrical signal can be ensured, and the influence of external noise is reduced.
With continued reference to fig. 1, the inner surface 31 of the sensing element is optionally spaced from the conductor 01 being measured by a distance in the range of 3mm to 10mm. The measured conductor 01 is cylindrical, and the circle center of the measured conductor 01 is the same as that of the induction component. The distance between the inner surface 31 and the detected conductor 01 is too large, the induced electric signal is weak, and the influence of external noise is also large, so that the inner surface 31 can be close to the detected conductor 01 as much as possible.
Example two
Fig. 5 is a flowchart of a control method of a voltage sensor according to a second embodiment of the present invention, where this embodiment is applicable to a case where a voltage of a measured conductor is measured, and this method may be executed by the voltage sensor according to the first embodiment, and the voltage sensor may be implemented in a form of hardware and/or software. The voltage sensor comprises an induction component, a signal processing circuit and a control module, wherein the induction component is in a hollow cylindrical shape and comprises an inner surface, an outer surface, a top surface and a bottom surface, the top surface is in a circular ring shape, the top surface and the bottom surface are in the same shape, the inner surface and the outer surface are conductors, and the inner surface and the outer surface are arranged in an insulating manner; the inner surface of the sensing component is electrically connected with the first input end of the signal processing circuit, the outer surface of the sensing component is electrically connected with the second input end of the signal processing circuit, the detected conductor penetrates through the sensing component, and the output end of the signal processing circuit is electrically connected with the control module;
referring to fig. 5, the method includes:
s10: after the tested conductor is electrified, the induction component generates an induction electric signal according to the voltage and the static induction of the tested conductor;
s20: the signal processing circuit generates an amplified signal according to the induced electrical signal;
s30: the control module determines the voltage of the conductor to be tested according to the amplified signal.
And determining the mapping relation between the voltage of the tested conductor and the induced electrical signal based on the Laplace transform.
Referring to the structure and equivalent circuit of the voltage sensor in fig. 1 and 2, the measured conductor voltage Vac and the induced electrical signal V can be obtained in The mapping relation of (1) is as follows:
by setting the structure of the signal processing circuit 2, i.e. the signal processing circuit 2 comprises a first capacitor C 01 A second capacitor C 02 A first resistor R 01 A second resistor R 02 The first input end of the amplifier Q1 is electrically connected with the inner surface 31 of the sensing part, the second input end of the amplifier Q1 is electrically connected with the outer surface 32 of the sensing part, and the output end of the amplifier Q1 is electrically connected with the control module 2; a first capacitor C 01 Is electrically connected to a first input of an amplifier Q1, a first capacitor C 01 Is electrically connected to the measurement ground GND 1; a first resistor R 01 Is electrically connected to a first input of an amplifier Q1, a first resistor R 01 Is electrically connected to the measurement ground GND 1; second capacitor C 02 Is electrically connected to the second input terminal of the amplifier Q1, a second capacitor C 02 Is electrically connected to the measurement ground GND 1; a second resistor R 02 Is electrically connected to a second input terminal of the amplifier Q1, a second resistor R 02 Is electrically connected to the measurement ground GND 1. A first resistor R 01 And a second resistor R 02 Have the same resistance value, and the first capacitor C 01 And a second capacitor C 02 The capacitance values of (a) are the same. Setting a first electric switchContainer C 01 Has a capacitance value in the range of 10 12 F-9×10 12 F, setting a first resistor R 01 Resistance value of (2) and first capacitor C 01 The product of the capacitance values of (a) is equal to 10. Through the arrangement, the voltage V of the measured conductor is enabled to be ac And an induced electrical signal V in The mapping relation of (1) is as follows:
i.e. the voltage V of the conductor to be measured ac And an induced electrical signal V in Have a linear relationship therebetween. />
The induced electrical signal is determined from the amplified signal and the gain of the signal processing circuit.
A linear relationship can be simply seen between the amplified electrical signal and the induced electrical signal, the amplified signal being equal to the product of the induced electrical signal and the gain of the signal processing circuit. Therefore, after the control module acquires the amplified signal, the sensing electric signal can be determined according to the amplified signal and the gain of the signal processing circuit.
And determining the voltage of the tested conductor according to the induced electrical signal and the mapping relation.
According to the induced electric signal and the voltage V of the measured conductor ac And an induced electrical signal V in The voltage of the tested conductor can be determined according to the mapping relation.
The beneficial effects of the control method of the voltage sensor are the same as those of the voltage sensor, and the description of the embodiment is omitted.
It should be understood that various forms of the flows shown above, reordering, adding or deleting steps, may be used. For example, the steps described in the present invention may be executed in parallel, sequentially, or in different orders, and are not limited herein as long as the desired results of the technical solution of the present invention can be achieved.
The above-described embodiments should not be construed as limiting the scope of the invention. It should be understood by those skilled in the art that various modifications, combinations, sub-combinations and substitutions may be made in accordance with design requirements and other factors. Any modification, equivalent replacement, and improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (10)
1. A voltage sensor, comprising: the induction component is in a hollow cylinder shape and comprises an inner surface, an outer surface, a top surface and a bottom surface, the top surface is in a circular ring shape, the top surface and the bottom surface are in the same shape, the inner surface and the outer surface are both conductors, and the inner surface and the outer surface are arranged in an insulating mode;
the inner surface of the induction component is electrically connected with the first input end of the signal processing circuit, the outer surface of the induction component is electrically connected with the second input end of the signal processing circuit, and the detected conductor penetrates through the induction component;
the induction component is used for generating an induction electric signal when the tested conductor is electrified, and the signal processing circuit is used for generating an amplified signal according to the induction electric signal;
the output end of the signal processing circuit is electrically connected with the control module, and the control module is used for determining the voltage of the tested conductor according to the amplified signal.
2. The voltage sensor of claim 1, wherein the signal processing circuit comprises a first capacitor, a second capacitor, a first resistor, a second resistor, and an amplifier, wherein a first input of the amplifier is electrically coupled to the inner surface of the sensing element, a second input of the amplifier is electrically coupled to the outer surface of the sensing element, and an output of the amplifier is electrically coupled to the control module;
a first end of the first capacitor is electrically connected with a first input end of the amplifier, and a second end of the first capacitor is electrically connected with a measurement grounding point;
a first end of the first resistor is electrically connected with a first input end of the amplifier, and a second end of the first resistor is electrically connected with the measurement grounding point;
a first end of the second capacitor is electrically connected with the second input end of the amplifier, and a second end of the second capacitor is electrically connected with the measurement grounding point;
the first end of the second resistor is electrically connected to the second input terminal of the amplifier, and the second end of the second resistor is electrically connected to the measurement ground point.
3. The voltage sensor of claim 2, wherein the first resistor and the second resistor have the same resistance, the first capacitor and the second capacitor have the same capacitance, and the first capacitor has a capacitance in the range of 10 12 F-9×10 12 F, the product of the resistance value of the first resistor and the capacitance value of the first capacitor is equal to 10.
4. The voltage sensor of claim 2, wherein the signal processing circuit further comprises a filter capacitor and a filter resistor, wherein a first terminal of the filter capacitor is electrically connected to the output terminal of the amplifier, a second terminal of the filter capacitor is electrically connected to the control module, a first terminal of the filter resistor is electrically connected to a second terminal of the filter capacitor, and a second terminal of the filter resistor is electrically connected to the measurement ground.
5. The voltage sensor of claim 1, wherein the diameter of the inner circle of the top surface of the sensing part is in the range of 55mm-80mm, and the diameter of the outer circle of the top surface of the sensing part is in the range of 60mm-85mm.
6. The voltage sensor of claim 1, wherein the difference between the radii of the inner and outer circles of the top surface of the sensing part is in the range of 10mm to 20mm.
7. The voltage sensor of claim 1, wherein the sensing member has a length along a current direction of the conductor under test in a range of 50mm to 80mm.
8. The voltage sensor of claim 1, wherein the inner surface of the sensing member is located at a distance ranging from 3mm to 10mm from the conductor under test.
9. The control method of the voltage sensor is characterized in that the voltage sensor comprises an induction component, a signal processing circuit and a control module, wherein the induction component is in a hollow cylindrical shape, the induction component comprises an inner surface, an outer surface, a top surface and a bottom surface, the top surface is in a circular ring shape, the top surface and the bottom surface are in the same shape, the inner surface and the outer surface are conductors, and the inner surface and the outer surface are arranged in an insulating mode; the inner surface of the induction component is electrically connected with the first input end of the signal processing circuit, the outer surface of the induction component is electrically connected with the second input end of the signal processing circuit, the detected conductor penetrates through the induction component, and the output end of the signal processing circuit is electrically connected with the control module;
the control method comprises the following steps:
after the tested conductor is electrified, the induction component generates an induction electric signal according to the voltage and the static induction of the tested conductor;
the signal processing circuit generates an amplified signal according to the induced electrical signal;
and the control module determines the voltage of the conductor to be tested according to the amplified signal.
10. The method of claim 9, wherein the control module determines the voltage of the conductor under test from the amplified signal, comprising:
determining a mapping relation between the voltage of the conductor under test and the induced electrical signal based on Laplace transform;
determining the induced electrical signal according to the amplified signal and the gain of the signal processing circuit;
and determining the voltage of the tested conductor according to the induced electrical signal and the mapping relation.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202211615687.0A CN115902377A (en) | 2022-12-15 | 2022-12-15 | Voltage sensor and control method thereof |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202211615687.0A CN115902377A (en) | 2022-12-15 | 2022-12-15 | Voltage sensor and control method thereof |
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| CN115902377A true CN115902377A (en) | 2023-04-04 |
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| CN202211615687.0A Pending CN115902377A (en) | 2022-12-15 | 2022-12-15 | Voltage sensor and control method thereof |
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| Country | Link |
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| CN (1) | CN115902377A (en) |
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2022
- 2022-12-15 CN CN202211615687.0A patent/CN115902377A/en active Pending
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