KR20200013359A - Device and method for measuring dc electric field - Google Patents

Abstract

The present invention relates to an apparatus for measuring a DC electric field and a method thereof. According to an embodiment of the present invention, the apparatus for measuring a DC electric field comprises: a charging electrode unit in which charging electrodes to induce a DC electric field distributed in a three-axis space of an orthogonal coordinate system are arranged for each axis; a switching control signal for generating unit for generating a switching control signal in accordance with a measurement frequency and the measurement time set by a user; a DC electric field measuring unit for measuring a voltage or a current converted in the amount of charge induced to the charging electrode in accordance with the switching control signal; and an electric field strength calculating unit for calculating the three-axis electric field strength using the voltage or the current measured by the DC electric field measuring unit.

Description

DC electric field measuring device and its method {DEVICE AND METHOD FOR MEASURING DC ELECTRIC FIELD}

The present invention relates to a direct current field measuring device and a method thereof, and more particularly, by measuring a direct current electric field having a constant shape without changing the polarity of the electric field by combining the direct electric field measurement values induced through a three-axis charging electrode. The present invention relates to a direct current field measurement device and method for accurately measuring the direct current field distribution distributed in space.

In general, in the case of thunderclouds, HVDC transmission lines, DC distribution lines, and devices using a DC power source, an electric field having a positive (+) or a negative (-) form is generated. Is maintained.

On the other hand, most transmission and distribution lines, power equipment, etc. currently in operation are frequency characteristics corresponding to a power frequency of 60 Hz or 50 Hz, and form an electric field whose magnitude and direction change with time. Since this variable electric field is induced in the metal body, it generates a voltage having the same frequency. Accordingly, the AC field sensor may measure the magnitude and frequency state of the electric field using the generated voltage.

However, since the electrostatic field in which the electric field is kept constant does not change in size, unlike an alternating current, the electric field is not induced and thus it is impossible to measure using an alternating electric field sensor that measures a variable electric field.

Conventionally, a DC electric field is measured by measuring a change in the area of the metal electrified plate exposed to an electric field by facing the metal electrified plate and another grounded metal plate and rotating the other metal plate using a motor.

In this manner, as the charged area is changed, a constant waveform is generated while repeating the generation and disappearance in proportion to the area where the charge induced in the charging plate is exposed. At this time, the DC electric field amplifies and measures the generated AC signal.

Conventional DC electric field measurement method is greatly affected by the state of the motor because the motor is used to generate the change per hour in the area of the charging plate. In other words, when measuring outdoors, the life of the motor can be greatly reduced than when using indoors due to snow, rain, or various environmental influences.In case of failure of the motor, DC electric field measurement is impossible, so the reliability of measurement data Will fall.

In addition, the conventional DC field measurement method has a limitation that it is difficult to use mobile and portable because the area required for the placement of the rotating charging plate and the fixed charging plate is large.

Republic of Korea Patent Publication No. 10-2015-0037135

An object of the present invention is to accurately measure the DC field distribution distributed in space by measuring a DC electric field having a constant shape without changing the polarity of the electric field by combining the DC electric field measurement values induced through a three-axis charging electrode To provide a direct current field measuring device and a method thereof.

An apparatus for measuring a direct current field according to an embodiment of the present invention includes a charging electrode unit in which charge electrodes for guiding a direct current electric field distributed in a three-axis space of a Cartesian coordinate system are arranged for each axis; A switching control signal generator for generating a switching control signal according to a measurement frequency and a measurement time set by a user; A direct current field measuring unit for measuring a voltage or current in which the amount of charge induced in the charging electrode is converted according to the switching control signal; And an electric field strength calculator for calculating the three-axis electric field strength by using the voltage or current measured by the DC electric field measuring unit.

The switching control signal generator comprises: a basic signal generator for generating a basic signal that oscillates periodically according to the measurement frequency; A command value generator for generating a command value for adjusting the on / off state ratio of the pulse signal identified from the basic signal in proportion to the measurement time; And a pulse signal generator for generating the switching control signal in the form of a pulse signal according to the basic signal and the command value.

The waveform of the basic signal may have a shape in which the overall shape of the waveform and the shape of the top of the horizontal line have a similar proportion when the horizontal line of the bottom side is adjusted up or down.

The similarity ratio may correspond to an on / off state ratio with respect to a period of a pulse signal identified from the basic signal.

The command value may be expressed as a percentage of an on state of a pulse signal in a period of the basic signal.

The pulse signal generator may generate an on / off pulse signal form by identifying an intersection between the basic signal and the command value to generate the switching control signal.

The DC field measuring unit may include: a switching unit for inducing a variable electric field by alternating a DC electric field distributed in three-axis space of a rectangular coordinate system through switching control of the charging electrode according to the switching control signal; And a voltage / current measuring unit for measuring a voltage or current in which charge amount induced in the charging electrode of the charging electrode unit is converted according to an on / off operation of the switching unit.

The charging electrode unit may be configured of three pairs of anodes facing each other based on three axes of a Cartesian coordinate system.

The switching unit includes three switches corresponding to each axis, the voltage / current measuring unit includes three voltage / current meters corresponding to each axis, and one end of each switch of the switching unit is disposed on each axis. It is connected to any one of each pair of charging electrodes, the other end of each switch is connected to one end of each voltage / ammeter of the voltage / current measuring unit, the other end of each voltage / ammeter of each pair of charging electrodes disposed on each axis It may be connected to one of the other.

The switching unit includes six switches corresponding to each axis, the voltage / current measuring unit includes six voltage / current meters corresponding to each axis, and one end of each switch of the switching unit is disposed on each axis. It may be connected to any one of each pair of charging electrodes, the other end of each switch is connected to one end of each voltage / ammeter of the voltage / current measuring unit, the other end of each voltage / ammeter may be grounded.

The charging electrode unit may be configured such that the charging electrode is composed of three single poles for each axis based on three axes of a Cartesian coordinate system.

The switching unit includes three switches corresponding to each axis, the voltage / current measuring unit includes three voltage / current meters corresponding to each axis, and one end of each switch of the switching unit is disposed on each axis. It is connected to each charging electrode, the other end of each switch is connected to one end of each voltage / ammeter of the voltage / current measuring unit, the other end of each voltage / ammeter may be grounded.

According to an embodiment, a memory for storing the calculated three-axis electric field strength; A GPS receiver for confirming measurement position information of the calculated three-axis electric field strength; And a display unit for displaying the calculated three-axis electric field strength.

The apparatus may further include a user input unit configured to set the measurement frequency and the measurement time by a user, wherein the user input unit and the display unit may be a touch type display capable of simultaneously performing an input function and a screen display function.

In addition, the DC electric field measuring method according to an embodiment of the present invention, generating a switching control signal according to the measurement frequency and the measurement time set by the user; Measuring a voltage or a current in which a charge amount induced in a charging electrode arranged for each axis on a three-axis space of a rectangular coordinate system is converted according to the switching control signal; And calculating a three-axis electric field strength by using the measured voltage or current.

The generating step may include generating a basic signal that oscillates periodically according to the measurement frequency; Generating a command value for adjusting an on / off state ratio of the pulse signal identified from the basic signal in proportion to the measurement time; And generating the switching control signal in the form of a pulse signal according to the basic signal and the command value.

The measuring step may include: inducing a variable electric field by alternating a DC electric field distributed in three-axis space of a rectangular coordinate system through switching control of the charging electrode according to the switching control signal; And measuring a voltage or a current in which the amount of charge induced in the charging electrode is converted.

According to the present invention, by measuring a direct current field having a constant shape without changing the polarity of the electric field by combining the direct current field measurement values induced through the three-axis charging electrode, it is possible to accurately measure the direct current electric field distribution distributed in space. .

In addition, the present invention can accurately measure the DC field distribution distributed in the space by reducing the error caused by the measurement position or method by the combination of the DC field measurement value measured through the three-axis charging electrode.

In addition, the present invention can be manufactured inexpensively and reliably with a smaller size than implementing a triaxial charging electrode through a mechanical driving unit using a motor.

In addition, the present invention instead of the method of inducing a direct current electric field by changing the area by rotating the other metal plate using a motor after facing the metal charging plate and the other grounded metal plate, the period and time of acquiring the charge induced in the three-axis electrode It can be measured by changing.

In addition, the present invention can be configured to omit the ground portion can be manufactured to be mobile and can easily measure the electric field of the DC transmission line or related power equipment in a small size.

In addition, the present invention can provide a measurement position with GPS position information, it is possible to notify the risk of lightning by installing the DC field measuring device in a high risk of lightning, such as golf courses, rice fields, plains.

1 is a view showing a direct current field measuring apparatus according to a first embodiment of the present invention;
2 is a view showing a charging electrode of FIG.
3 is a diagram illustrating a switching control signal generator of FIG. 1;
4 is a view showing a waveform example of a basic signal generated by the basic signal generator of FIG.
5 is a diagram illustrating on / off ratio adjustment of a pulse signal in accordance with a setpoint adjustment;
6 is a diagram illustrating a case where a pulse signal is generated from a rectangular wave;
7 is a view showing a direct current field measuring device according to a second embodiment of the present invention;
8 is a view showing a charging electrode unit of FIG.
9 is a view showing a direct current field measuring apparatus according to a third embodiment of the present invention;
10 is a view showing a direct current field measuring method according to an embodiment of the present invention.

Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings. However, in the following description and the accompanying drawings, detailed descriptions of well-known functions or configurations that may obscure the subject matter of the present invention will be omitted. In addition, it should be noted that like elements are denoted by the same reference numerals as much as possible throughout the drawings.

The terms or words used in the specification and claims described below should not be construed as being limited to the ordinary or dictionary meanings, and the inventors are properly defined as terms for explaining their own invention in the best way. It should be interpreted as meaning and concept corresponding to the technical idea of the present invention based on the principle that it can.

Therefore, the embodiments described in the specification and the drawings shown in the drawings are only the most preferred embodiments of the present invention, and do not represent all of the technical idea of the present invention, various modifications that can be substituted for them at the time of the present application It should be understood that there may be equivalents and variations.

In the accompanying drawings, some components are exaggerated, omitted, or schematically illustrated, and the size of each component does not entirely reflect the actual size. The invention is not limited by the relative size or spacing drawn in the accompanying drawings.

When any part of the specification is to "include" any component, this means that it may further include other components, except to exclude other components unless specifically stated otherwise. In addition, when a part is "connected" with another part, this includes not only the case where it is "directly connected" but also the case where it is "electrically connected" with another element between them.

Singular expressions include plural expressions unless the context clearly indicates otherwise. The terms "comprise" or "have" are intended to indicate that there is a feature, number, step, operation, component, part, or combination thereof described in the specification, but one or more other features, numbers, steps It is to be understood that the present disclosure does not exclude the possibility of the presence or the addition of any operation, a component, a part, or a combination thereof.

DETAILED DESCRIPTION Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings so that those skilled in the art may easily implement the present invention. As those skilled in the art would realize, the described embodiments may be modified in various different ways, all without departing from the spirit or scope of the present invention. In the drawings, parts irrelevant to the description are omitted in order to clearly describe the present invention, and like reference numerals designate like parts throughout the specification.

Hereinafter, with reference to the accompanying drawings will be described a preferred embodiment of the present invention.

1 is a view showing a direct current field measuring apparatus according to a first embodiment of the present invention, FIG. 2 is a view showing a charging electrode unit of FIG. 1, FIG. 3 is a view showing a switching control signal generation unit of FIG. .

As shown in FIG. 1, the DC electric field measuring device 100 according to the first embodiment of the present invention combines DC electric field measurement values induced through a three-axis charging electrode to maintain a constant polarity of the electric field. By measuring the direct current electric field having a shape, it is possible to accurately measure the direct current electric field distribution distributed in the space.

In other words, the DC electric field measuring device 100 measures the waveform generated by the area change generated by the driving of the motor, and measures the DC electric field instead of acquiring the electric charge cycle induced in the triaxial charging electrode. To change the dc electric field.

Through this, the DC field measuring apparatus 100 may provide a compact, inexpensive, and reliable structure by implementing a mechanical driving method using a motor as an electric driving method using a triaxial charging electrode.

On the other hand, the DC electric field measuring device 100 is a charging electrode 110, DC electric field measuring unit 120, the switching control signal generator 130, the user input unit 140, the electric field strength calculation unit 150, the display unit 160 ), A memory 170, and a GPS receiver 180.

In the charging electrode unit 110, a pair of charging electrodes are arranged for each axis in three axes (ie, x-axis, y-axis, and z-axis) of a Cartesian coordinate system to induce charge for each axis of a direct current electric field distributed in a space. . At this time, the DC electric field is distributed in the internal space of the charging electrode unit 110.

Referring to FIG. 2, the charging electrode unit 110 is implemented in a hexahedral structure in which three pairs of charging electrodes that are orthogonally disposed with respect to three axes of a rectangular coordinate system face each other.

In this case, a pair of charging electrodes are constituted by the anodes facing each other in each axis. That is, the three pairs of charging electrodes are a pair of charging electrodes 110-1 and 110-2 arranged on the x-axis (yz plane) and a pair of charging electrodes 110 disposed on the y-axis (xz plane). -3, 110-4, and a pair of charging electrodes 110-5, 110-6 arrange | positioned on z-axis (xy plane). Here, each of the charging electrodes is an electrode of a metal material (for example, copper, aluminum, etc.) in the form of a plate having the same area.

The DC field measuring unit 120 measures a DC electric field induced in each pair of charging electrodes of the charging electrode unit 110 according to the measurement frequency (measuring period) and the measurement time set by the user. To this end, the DC electric field measuring part 120 includes a switching part 121 and a voltage / current measuring part 122. That is, the switching unit 121 controls the on / off operation of the switch according to the switching control signal in the form of an on / off pulse input from the switching control signal generator 130. In this case, the switching unit 121 may induce a variable electric field by alternating a DC electric field distributed in the internal space of the charging electrode unit 110. Then, the voltage / current measuring unit 122 measures the voltage or current in which the amount of charge induced in the charging electrode of the charging electrode unit 110 is converted according to the on / off operation of the switching unit 121. In this case, the voltage / current measuring unit 122 measures the voltage or current induced in the charging electrode to measure the change in the amount of charge per hour of the charging electrode.

The other end of the switching unit 121 and one end of the voltage / current measuring unit 122 are connected to each other in series. At this time, one end of the switching unit 121 is connected to one of the pair of charging electrodes of the charging electrode unit 110, and the other end of the voltage / current measuring unit 122 is a pair of charging of the charging electrode unit 110 Connected to the other of the electrodes.

Specifically, the switching unit 121 includes three switches corresponding to three axes, and specifically, the first switch 121-1 connected to one of the pair of charging electrodes 110-2 disposed on the x axis. ), a second switch 121-2 connected to one of the pair of charging electrodes 110-4 disposed on the y-axis, and a second switch 121-2 connected to one of the pair of charging electrodes disposed on the z-axis. Three switches 121-3 are included. Here, the first switch 121-1, the second switch 121-2, and the third switch 121-3 may be individually or simultaneously controlled.

In addition, the voltage / current measuring unit 122 is connected in series with the first switch 121-1 and connected to the other one 110-1 of a pair of charging electrodes disposed on the x-axis ( 122-1), a second voltage / ammeter 122-2 connected in series with the second switch 121-2, and connected to the other one 110-3 of the pair of charging electrodes arranged on the y-axis; And a third voltage / ammeter 122-3 connected in series with the three switches 121-3 and connected to the other one 110-5 of the pair of charging electrodes disposed on the z-axis.

Here, the voltage / current measuring unit 122 is configured to measure the voltage or current, and measures the voltage induced at both ends of Z (resistance or impedance) through the electric charge flowing when the switch of the switching unit 121 is connected. Or measure the current using CT (Current Transformer, current transformer, hook meter, etc.) by setting Z (resistance or impedance) to zero, or install a Hall sensor instead of Z (resistance or impedance). Can measure the current without.

As such, the first switch 121-1 and the first voltage / ammeter 122-1, the second switch 121-2 and the second voltage / ammeter 122-2, and the third switch 121-3 And the third voltage / ammeter 122-3 may be arranged in parallel.

The switching control signal generation unit 130 generates a switching control signal according to the measurement frequency (measuring period) and the measurement time set by the user input unit 140 and transmits the switching control signal to the DC electric field measurement unit 120. Here, the switching control signal is a control signal that oscillates periodically according to the measurement frequency (measuring period) and the measurement time set through the user input unit 140.

Referring to FIG. 3, the switching control signal generator 130 includes a basic signal generator 131, a command value generator 132, and a pulse signal generator 133.

The basic signal generator 131 generates a basic signal that oscillates periodically according to the measurement frequency (measuring period) set by the user input unit 140. Here, it is preferable that the waveform of the basic signal has a shape in which the overall shape of the waveform and the shape of the top of the horizontal line have a similar proportion when the horizontal line of the base is adjusted up or down, for example, a symmetrical or asymmetric triangular wave (see FIG. 4). (a) reference] or a rectangular wave [see (b) of FIG. 4]. 4 is a diagram illustrating a waveform example of a basic signal generated by the basic signal generator of FIG. 3.

The command value generator 132 generates a command value proportional to the measurement time according to the measurement time set by the user input unit 140.

Here, the measurement time corresponds to an on state time of the pulse signal output through the pulse signal generator 133.

The command value is a signal indicating a constant voltage, and the ratio of the on state and the off state of the pulse signal can be adjusted while adjusting the basic signal generated by the basic signal generator 131 up and down. That is, the reference value is expressed as a percentage of the on state of the pulse signal in the period of the corresponding basic signal.

For example, in FIG. 5, when the command value is 90% of the period T of the corresponding basic signal, one period T of the pulse signal indicates 90% of an on state and 10% of an off state. In this case, the measurement time is a time that is 90% of one period T in the pulse signal (that is, the measurement time is 90% x T). In addition, in FIG. 5, when the command value is 60% of the period T of the basic signal, one period T of the pulse signal indicates 60% of the on state and 40% of the off state. In this case, the measurement time is a time which is 60% of one period T in the pulse signal (that is, the measurement time is 60% x T).

As shown in Fig. 5, the setpoint adjustment changes the similarity ratio of triangles, and changing the similarity ratio of triangles changes the on-state time of the pulse signal. That is, the setpoint adjustment indicates that there is a proportional correlation with the on-state time of the pulse signal. Thus, adjusting the setpoint from 90% to 60% means that the on-state time of the pulse signal changes from 90% time to 60% time of the period T. 5 is a diagram for explaining on / off ratio adjustment of a pulse signal in accordance with a command value adjustment.

In this way, the command value generator 132 generates a command value in proportion to the measurement time for adjusting the on / off state ratio of the pulse signal identified from the basic signal.

In addition, the pulse signal generator 133 generates a switching control signal in the form of a pulse signal using the basic signal generated by the basic signal generator 131 and the command value generated by the command value generator 132.

That is, the pulse signal generator 133 generates the switching control signal by deriving the on / off pulse signal form by checking the intersection point between the basic signal waveform and the command value waveform.

As described above, since the waveforms above the basic signal waveform and the setpoint waveform are triangular like, the on / off ratio for the period T of the pulse signal can be derived by checking the triangular similarity between the two.

In the case of the triangular wave of FIG. 5, the pulse signal generator 133 needs to check two points of intersection between the basic signal waveform and the command value waveform, but in the case of the rectangular wave of FIG. 6, the pulse signal generator 133 is the basic signal waveform. It is also possible to check the intersection between the and setpoint waveforms in one place. 6 is a diagram illustrating a case where a pulse signal is generated from a rectangular wave.

The user input unit 140 may set the measurement frequency (measuring period) and the measurement time required for generating the switching signal of the switching control signal generator 130 by the user.

The electric field strength calculating unit 150 calculates the three-axis electric field strength using the voltage or current measured by the DC electric field measuring unit 120.

First, the electric field strength calculating unit 150 calculates electric field strengths (E _x , E _y , E _z ) of each axis corresponding to components in which three axes are decomposed using Equations 1 and 2 below. .

이기 때문에, 이를 이용하면 [수학식 2]를 얻을 수 있다.As shown in [Equation 1], the charge q _s (t) induced in the charging electrode of the charging electrode unit 110 by the electric field strength E for measuring at a specific time t time is the air dielectric constant ε ₀ and the charging electrode portion ( It is proportional to the product of the area a _s (t), which effectively acts to induce charge of the charging electrode of 110). Here, K1 is a proportional constant for correcting [Equation 1] in consideration of various situations. At this time, the current i _s (t) is the flow of charge per hour

Because of this, using this equation (2) can be obtained.

Then, the electric field strength E can be calculated through Equation 2. In this case, the known air dielectric constant ε ₀ and the pulse signal of the switching control signal are used.

로 표현된다. 전계강도 E는 이러한 관계로부터 계산될 수 있다. 이때, K2는 스위칭 제어신호의 펄스 신호에 따른 대전 전극의 시간당 변화량을 실제 유효 면적 변화분으로 환산 적용하기 위한 비례상수이다.That is, the current value generated by the induced charge while changing in units of time according to the measurement frequency (measuring cycle) and measurement time is i _s (t), and the charging electrode unit that changes in units of time according to the measurement frequency and measurement time ( 110, the charging electrode change

It is expressed as The field strength E can be calculated from this relationship. In this case, K2 is a proportional constant for converting the change amount of the charging electrode per hour according to the pulse signal of the switching control signal into the actual effective area change.

Here, K1 and K2 may be calculated or corrected through a test at a known electric field strength E.

As described above, the electric field strength E calculated through Equation 2 is a value calculated by decomposing specific components of three axes.

Next, the electric field strength calculating unit 150 calculates the electric field strength magnitude for the three axes using the equation (3).

The electric field strength calculator 150 stores the electric field strengths for the three axes in the memory 170. In this case, the electric field strength calculation unit 150 stores the measurement position information checked through the GPS receiver 180. Here, the memory 170 stores the measurement frequency and the measurement time set by the user input unit 140.

The display unit 160 displays the operating state of the components of the DC electric field measuring device 100 and the magnitude of the electric field strength calculated by the electric field strength calculating unit 150. The user input unit 140 and the display unit 160 may be configured independently of the input function and the screen display function, but may be implemented through a touch type display capable of simultaneously performing the input function and the screen display function.

7 is a view showing a direct current field measuring apparatus according to a second embodiment of the present invention, Figure 8 is a view showing the charging electrode portion of FIG.

7 and 8, the DC electric field measuring device 200 according to the second exemplary embodiment of the present invention is similar to the DC electric field measuring device 100 of FIG. 1, and the charging electrode unit 210 and the DC electric field measurement are performed. The unit 220 includes a switching control signal generator 230, a user input unit (not shown), a field strength calculator 250, a display unit (not shown), a memory (not shown), and a GPS receiver (not shown). Here, since the components of the DC electric field measuring device 200 of FIG. 7 overlap with the DC electric field measuring device 100 of FIG. 1, detailed descriptions thereof will be omitted.

However, as shown in FIG. 8, the charging electrode unit 210 configures the charging electrodes 210-1, 210-2, and 210-3 as single poles for each axis in three axes of the rectangular coordinate system.

The DC electric field measuring unit 220 includes a switching unit 221 and a voltage / current measuring unit 222. In this case, the other end of the switching unit 221 and one end of the voltage / current measuring unit 222 are connected in series with each other. One end of the switching unit 221 is connected to the charging electrode of the charging electrode unit 210, and the other end of the voltage / current measuring unit 222 is grounded.

Specifically, the other end of the first switch 221-1 and one end of the first voltage / ammeter 222-1 are connected to each other in series, and one end of the first switch 221-1 is charged electrode 210 on the x-axis. -1), the other end of the first voltage / ammeter 222-1 is grounded. In addition, the other end of the second switch 221-2 and one end of the second voltage / ammeter 222-2 are connected to each other in series, and one end of the second switch 221-2 is charged on the y-axis 210-210. 2), and the other end of the second voltage / ammeter 222-2 is grounded. In addition, the other end of the third switch 221-3 and one end of the third voltage / ammeter 222-3 are connected in series with each other, and one end of the third switch 221-3 is a z-axis charging electrode 210-. 3), and the other end of the third voltage / ammeter 222-3 is grounded.

9 is a view showing a direct current field measuring apparatus according to a third embodiment of the present invention.

Referring to FIG. 9, the DC electric field measuring device 300 according to the third exemplary embodiment of the present invention is similar to the DC electric field measuring device 100 of FIG. 1 and the DC electric field measuring device 200 of FIG. 7. The unit 310, the DC field measuring unit 320, the switching control signal generator 330, the user input unit (not shown), the field strength calculator 350, the display unit (not shown), the memory (not shown), and the GPS receiver (Not shown). Since the components of the DC electric field measuring device 300 of FIG. 9 overlap with the DC electric field measuring device 100 of FIG. 1 or the DC electric field measuring device 200 of FIG. 7, detailed descriptions thereof will be omitted.

However, the DC field measuring device 300 of FIG. 9 may use both a positive electrode structure such as the charging electrode unit 110 of FIG. 2 and a single pole structure such as the charging electrode unit 210 of FIG. 8. ) Represents the structure.

Here, the DC electric field measuring unit 320 includes a switching unit 321 and a voltage / current measuring unit 322. In this case, since the DC field measuring unit 320 may be provided with up to six charging electrodes in the charging electrode unit 310, the DC field measuring unit 320 includes a switch and a voltage / ammeter connected to each of the six charging electrodes. In addition, one end of the voltage / current measuring unit 322 is connected to the switching unit 321 and the other end is grounded.

10 is a view showing a direct current field measuring method according to an embodiment of the present invention.

First, the DC electric field measuring device 100 generates a switching control signal according to the measurement frequency and the measurement time set by the user (S401). In this case, the DC electric field measuring device 100 generates a basic signal that oscillates periodically according to the measurement frequency. Then, the DC field measuring apparatus 100 generates a command value for adjusting the on / off state ratio of the pulse signal identified from the basic signal in proportion to the measurement time. The DC field measuring apparatus 100 generates a switching control signal in the form of a pulse signal according to the basic signal and the command value.

Here, the waveform of the basic signal is a shape in which the overall shape of the waveform and the shape of the upper horizontal line may have a similar proportion when the horizontal line of the lower side is adjusted up or down. The likeness ratio also corresponds to the on / off state ratio for the period of the pulse signal identified from the base signal. The reference value is expressed as a percentage of the on state of the pulse signal in the period of the basic signal.

Thereafter, the DC electric field measuring device 100 measures the voltage or current in which the charge amount induced in the charging electrode arranged for each axis on the three-axis space of the Cartesian coordinate system is converted according to the switching control signal (S402).

In this case, the DC electric field measuring device 100 induces a variable electric field by alternating a DC electric field distributed in three-axis space of the Cartesian coordinate system through switching control of the charging electrode according to the switching control signal. Then, the DC field measuring device 100 measures the voltage or current in which the amount of charge induced in the charging electrode is converted.

Then, the DC electric field measuring device 100 calculates the three-axis electric field strength by using the measured voltage or current (S403).

Although the foregoing description has been focused on the novel features of the invention as applied to various embodiments, those skilled in the art will appreciate that the apparatus and method described above without departing from the scope of the invention. It will be understood that various deletions, substitutions, and changes in form and detail of the invention are possible. Accordingly, the scope of the invention is defined by the appended claims rather than in the foregoing description. All modifications within the scope of equivalents of the claims are to be embraced within the scope of the present invention.

110, 210, 310: charging electrode portion
120, 220, 320: DC field measuring unit
121, 221, 321: switching unit
121-1 ~ 121-3: 1st switch-3rd switch
122-1 to 122-3: first voltage / ammeter
122, 222, 322: voltage / current measuring unit
130, 230, 330: switching control signal generator
131: basic signal generator
132: setpoint generation unit
133: pulse signal generator
140: user input unit
150, 250, 350: field strength calculator
160: display unit
170: memory
180: GPS receiver

Claims (20)

A charging electrode unit in which charging electrodes for guiding a direct current electric field distributed in three-axis space of a rectangular coordinate system are arranged for each axis;
A switching control signal generator for generating a switching control signal according to a measurement frequency and a measurement time set by a user;
A direct current field measuring unit for measuring a voltage or current in which the amount of charge induced in the charging electrode is converted according to the switching control signal; And
An electric field strength calculator for calculating a three-axis electric field strength using the voltage or current measured by the DC electric field measuring unit;
DC field measuring device comprising a.
The method of claim 1,
The switching control signal generator,
A basic signal generator for generating a basic signal that oscillates periodically according to the measurement frequency;
A command value generator for generating a command value for adjusting the on / off state ratio of the pulse signal identified from the basic signal in proportion to the measurement time; And
A pulse signal generator for generating the switching control signal in the form of a pulse signal according to the basic signal and the command value;
DC field measuring device comprising a.
The method of claim 2,
The waveform of the basic signal is,
DC field measurement device in which the shape of the entire waveform and the shape of the top of the horizontal line can have similar proportions when the bottom horizontal line is adjusted up or down.
The method of claim 3, wherein
The similarity ratio is,
DC field measurement apparatus corresponding to the on / off state ratio with respect to the period of the pulse signal identified from the basic signal.
The method of claim 2,
The command value is
DC electric field measuring device is expressed as a percentage of the on state of the pulse signal in the period of the basic signal.
The method of claim 2,
The pulse signal generator,
DC field measuring apparatus for generating the switching control signal by deriving the on / off pulse signal form by checking the intersection between the basic signal and the command value.
The method of claim 1,
The DC field measuring unit,
A switching unit for inducing a variable electric field by alternating a DC electric field distributed in three-axis space of a rectangular coordinate system through switching control of the charging electrode according to the switching control signal; And
A voltage / current measuring unit for measuring a voltage or current in which charge amount induced in a charging electrode of the charging electrode unit is converted according to an on / off operation of the switching unit;
DC field measuring device comprising a.
The method of claim 7, wherein
The charging electrode unit,
DC electric field measuring device is composed of three pairs of anodes facing each other based on the three axes of the Cartesian coordinate system.
The method of claim 8,
The switching unit includes three switches corresponding to each axis,
The voltage / current measuring unit includes three voltage / current meters corresponding to each axis,
One end of each switch of the switching unit is connected to any one of each pair of charging electrodes arranged on each axis, and the other end of each switch is connected to one end of each voltage / ammeter of the voltage / current measuring unit, and each voltage / ammeter The other end of the DC field measuring device is connected to the other of each of the pair of charging electrodes disposed on each axis.
The method of claim 8,
The switching unit includes six switches corresponding to each axis,
The voltage / current measuring unit includes six voltage / current meters corresponding to each axis,
One end of each switch of the switching unit is connected to any one of each pair of charging electrodes arranged on each axis, and the other end of each switch is connected to one end of each voltage / ammeter of the voltage / current measuring unit, and each voltage / ammeter The other end of the DC field measuring device that is grounded.
The method of claim 7, wherein
The charging electrode unit,
DC electric field measuring device wherein the charging electrode is composed of three single poles for each axis based on three axes of a Cartesian coordinate system.
The method of claim 11,
The switching unit includes three switches corresponding to each axis,
The voltage / current measuring unit includes three voltage / current meters corresponding to each axis,
One end of each switch of the switching unit is connected to each charging electrode disposed on each axis, and the other end of each switch is connected to one end of each voltage / ammeter of the voltage / current measuring unit, and the other end of each voltage / ammeter is grounded. DC electric field measuring device.
The method of claim 1,
A memory for storing the calculated three-axis electric field strength;
A GPS receiver for confirming measurement position information of the calculated three-axis electric field strength; And
A display unit for displaying the calculated three-axis electric field strength;
DC electric field measuring device further comprising.
The method of claim 13,
And a user input unit configured to set the measurement frequency and the measurement time by a user.
And the user input unit and the display unit are touch type displays capable of simultaneously performing an input function and a screen display function.
Generating a switching control signal according to a measurement frequency and a measurement time set by a user;
Measuring a voltage or a current in which a charge amount induced in a charging electrode arranged for each axis on a three-axis space of a rectangular coordinate system is converted according to the switching control signal; And
Calculating a three-axis electric field strength using the measured voltage or current;
DC electric field measuring method comprising a.
The method of claim 15,
The generating step,
Generating a basic signal that oscillates periodically according to the measurement frequency;
Generating a command value for adjusting an on / off state ratio of the pulse signal identified from the basic signal in proportion to the measurement time; And
Generating the switching control signal in the form of a pulse signal according to the basic signal and the command value;
DC electric field measuring method comprising a.
The method of claim 16,
The waveform of the basic signal is,
DC field measurement method in which the shape of the entire waveform and the shape of the top of the horizontal line can have similar proportions when the bottom horizontal line is adjusted up or down.
The method of claim 17,
The similarity ratio is,
DC field measurement method corresponding to the on / off state ratio with respect to the period of the pulse signal identified from the basic signal.
The method of claim 16,
The command value is
DC electric field measuring method as a percentage of the on state of the pulse signal in the period of the basic signal.
The method of claim 15,
The measuring step,
Inducing a variable electric field by alternating a direct current field distributed in three-axis space of a rectangular coordinate system through switching control of the charging electrode according to the switching control signal; And
Measuring a voltage or a current in which charge amount induced in the charging electrode is converted;
DC electric field measuring method comprising a.

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