JP2015219010A - Current measuring device - Google Patents

Current measuring device Download PDF

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JP2015219010A
JP2015219010A JP2014100013A JP2014100013A JP2015219010A JP 2015219010 A JP2015219010 A JP 2015219010A JP 2014100013 A JP2014100013 A JP 2014100013A JP 2014100013 A JP2014100013 A JP 2014100013A JP 2015219010 A JP2015219010 A JP 2015219010A
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Prior art keywords
current
measuring device
light
current measuring
water
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JP2014100013A
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Japanese (ja)
Inventor
小山 博
Hiroshi Koyama
博 小山
治寿 和田
Haruhisa Wada
治寿 和田
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株式会社東芝
Toshiba Corp
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Abstract

A current measuring device for measuring a current generated on a water surface or in water is provided.
SOLUTION: A pair of electrodes 23a and 23b disposed on the surface of the water or in water, a light emitter 1 that emits light having an intensity corresponding to a potential difference between the pair of electrodes 23a and 23b, and light emitted by the light emitter 1. A current measuring device including a calculation unit 5 that calculates a current value based on intensity.
[Selection] Figure 1

Description

  Embodiments described herein relate generally to a current measuring device for measuring a current generated on a water surface or in water.

  Overhead ground wires are provided for electric wires for power transmission and distribution. An overhead ground wire is, for example, a metal wire installed on top of an electric wire, and is a device that is used in combination with a lightning arrester or a lightning rod to protect the electric wire from lightning. By using the overhead ground wire, it is possible to prevent direct lightning strikes on the electric wires and reverse flashover due to lightning.

  In recent years, as a renewable energy power generation, many power plants using sunlight and wind power have been installed. In addition, natural energy such as sunlight and wind power is further spread as a distributed energy source. In power generation using natural energy, it is necessary to install equipment in a vast area in order to aggregate low density energy.

  In such power generation using natural energy, it is not appropriate to install an overhead ground wire because it prevents the concentration of natural energy. Therefore, for example, in a photovoltaic power plant, a large area of lightning is protected with a small number of lightning rods. The measurement of current during a lightning strike measured the high-density current flowing through the lightning rod using a Rogowski coil or magnetic field sensor.

JP 07-198811 A JP 2000-11585 A

  By the way, wind power generation may be installed on the water like offshore wind power generation. In this case, since there are no high-rise buildings around, it is easy to strike lightning on wind power generation equipment. Seawater has a lower resistance and a higher dielectric constant than the earth. For this reason, it is often unknown in which direction the lightning current flows from the ground electrode provided in the sea. There is no measured example of the low-density current distribution propagating in the water away from the grounding point.

  In an offshore wind farm, wind turbines are connected by a cable. Since this cable is submerged deeply in the sea, it is longer than the distance between wind turbines on the sea surface. As a result, the reverse flashover voltage may enter the cable. The lightning surge voltage propagating through the cable arrives later than the surge current propagating through the sea surface. Moreover, reverse surge becomes reverse voltage by propagating through a long distance cable. Therefore, in a marine substation to which cables having different lengths are connected, there is a high possibility that a complicated surge voltage in which various surge voltages are combined is generated.

  Current measurement using a conventional Rogowski coil or magnetic field sensor can measure high-density current flowing through a lightning rod, but because the current sensor is small, it propagates in water at a point away from the grounding point. The change cannot be detected for the low-density current distribution. Since the measurement of the current in the ocean as described above is necessary, it has been desired to develop a current measurement device capable of measuring a current value in a wide range.

  The problem to be solved by the present invention is to provide a current measuring device that can measure a current such as an electric shock current caused by a lightning strike on the water surface or in water with high sensitivity.

  The current measurement device of the embodiment is a current measurement device for measuring a current generated on the surface of the water or in water, and has a pair of electrodes arranged on the surface of the water or in water and an intensity corresponding to a potential difference between the pair of electrodes. A light-emitting body that emits light; and an arithmetic unit that calculates a current value based on the intensity of the light emitted by the light-emitting body.

It is a conceptual diagram which shows the structural example of the electric current measurement apparatus of 1st Embodiment. It is a conceptual diagram which shows the structural example of the electrode of the coaxial cylindrical structure applied to the modification 1 of 1st Embodiment. It is a conceptual diagram which shows the structural example of the electrode of the concentric sphere structure applied to the modification 2 of 1st Embodiment. It is a conceptual diagram which shows the structural example of the electric current measurement apparatus of 2nd Embodiment. It is a conceptual diagram which shows the structural example of housing | casing A 'applied to the electric current measurement apparatus of 2nd Embodiment. It is a key map showing the example of composition of the current measuring device of the modification of a 2nd embodiment. It is a conceptual diagram which shows the structural example of the electric current measurement apparatus of 3rd Embodiment. It is a conceptual diagram which shows the example of a structure of a part of electric current measuring apparatus of 4th Embodiment.

  Below, the current measuring device of each embodiment of the present invention is explained with reference to drawings.

[First Embodiment]
FIG. 1 is a conceptual diagram illustrating a configuration example of a current measuring device according to the first embodiment. The current measuring device of this embodiment includes a light emitter 1, a pair of electrode portions 2 a and 2 b, an optical fiber 3, a light receiving portion 4, a computing portion 5, and a display portion 6.

  The electrode portion 2a includes a terminal electrode 21a made of metal provided on the light emitter 1, an electric wire 22a, and a potential detection electrode 23a connected to the terminal electrode 21a via the electric wire 22a. Similarly, the electrode portion 2a includes a terminal electrode 21b made of metal provided on the light emitter 1, an electric wire 22b, and a potential detection electrode 23b connected to the terminal electrode 21b via the electric wire 22b.

  The electric wires 22a and 22b have a length of, for example, about several mm to several m, and a metal wire with an insulation coating is used. The potential detection electrodes 23a and 23b are arranged away from the light emitter 1 by the length of the electric wires 22a and 22b.

  The potential detection electrode 23a and the potential detection electrode 23b are arranged substantially in parallel while maintaining a predetermined interval by insulating supports 15a and 15b made of an insulating member. Note that the number of insulating supports 15 is arbitrary.

  The potential detection electrodes 23a and 23b are provided with floats 11a and 11b via insulating members 12a and 12b so that the positions of the potential detection electrodes 23a and 23b in the water depth direction are maintained. That is, the position of the potential detection electrodes 23a and 23b in the water depth direction can be changed by changing the lengths of the insulating members 12a and 12b. Further, the lengths of the insulating members 12a and 12b are set to zero, that is, the insulating members 12a and 12b are not provided, and the potential detection electrodes 23a and 23b are attached by directly attaching the floats 11a and 11b to the potential detection powers 23a and 23b. It can also be placed on the surface of the water.

  The light emitter 1 is also provided with floats 11c and 11d so as not to be submerged.

  Although not shown, the pair of potential detection electrodes 23a and 23b is fixed to the casing of the light emitter 1 provided with the floats 11c and 11d by the insulating members 12a and 12b, so that only the floats 11c and 11d are used. The floats 11a and 11b may be omitted by fulfilling the functions of the floats 11a and 11b.

  The floats 11a, 11b, 11c, and 11d may be printed with the potential detection electrodes 23a and 23b, the identification number of the light emitter 1, or an IC tag on which identification information is recorded. . By doing in this way, it can be used for recognition of the electric potential detection electrodes 23a and 23b and the light emitter 1.

  FIG. 1 shows an example in which the light emitter 1 is provided with two floats 11c and 11d. However, the number of floats is not limited to two, and may be one or three or more. It may be.

  When power is dropped on the water surface or in the water, a current flows between the pair of potential detection electrodes 23 and 23b. This potential changes the potential difference. This potential difference is also maintained between the pair of terminal electrodes 21a and 21b. Due to the potential difference between the pair of terminal electrodes 21a and 21b, the light emitter 1 emits light. And the intensity | strength is proportional to the magnitude | size of the electrical potential difference between a pair of terminal electrode 21a, 21b.

  As the light emitter 1, a light emitting diode that outputs single-wavelength light, a super luminescence diode, a laser, or the like can be used, but is not limited thereto. The light emitted by the light emitter 1 is collected by a lens (not shown) and guided to the light receiving unit 4 by the optical fiber 3. The optical fiber 3 can be a multimode fiber, but is not limited to this. As described above, by guiding the light emitted from the light emitter 1 to the light receiving unit 4 through the optical fiber 3, the casing A that houses the light receiving unit 4, the calculation unit 5, and the display unit 6 is installed in the marine facility. Or on board.

  The light receiving unit 4 is a converter that detects light input through the optical fiber 3 and converts the light into an electric signal. For example, a photodiode can be used as the light receiving unit 4. A signal amplifier circuit may be provided in the light receiving unit 4 to amplify the converted electric signal to an appropriate signal strength. The light receiving unit 4 and the calculation unit 5 are connected so as to be communicable by wire or wirelessly. As a result, the electrical signal obtained by the light receiving unit 4 is output to the calculation unit 5.

  The computing unit 5 is configured to calculate a current value corresponding to the light intensity. The calculation unit 5 calculates the intensity of light from the electrical signal input from the light receiving unit 4 and calculates a corresponding current value. Further, the calculation unit 5 may be configured to calculate the current density between the potential detection electrodes 23a and 23b. The result calculated by the calculation unit 5 is output from the display unit 6. The calculation unit 5 can be configured by a computer operating with a predetermined program or a dedicated electronic circuit, but is not limited thereto. The display unit 6 is a display device that displays the current value calculated by the calculation unit 5. As the display unit 6, for example, a display having a display screen such as a liquid crystal display panel can be used.

  Necessary electric power is provided from an external power source (not shown) to each component in the housing A, that is, the light receiving unit 4, the calculation unit 5, and the display unit 6.

  The operation of the current measuring device of the present embodiment having the above configuration will be described below.

  When power is dropped on the water surface or in the water, a current flows between the pair of potential detection electrodes 23 and 23b. This current also changes the potential difference. By maintaining this potential difference between the pair of terminal electrodes 21a and 21b, the light emitter 1 emits light having an intensity corresponding to the potential difference. This light is guided to the light receiving unit 4 through the optical fiber 3.

  In the light receiving unit 4, the light input through the optical fiber 3 is detected and converted into an electric signal corresponding to the intensity of the light. This electric signal is output to the arithmetic unit 5. In the calculation unit 5, for example, a current value or a current density is calculated based on this electrical signal. The calculated current value or current density is displayed from the display unit 6.

  The following effects can be obtained by the current measuring device of the present embodiment as described above.

  By increasing the distance between the pair of potential detection electrodes 23a and 23b, it is possible to measure a current value in a wide range, and thus it is possible to detect a change in a low-density current distribution. Therefore, it is possible to measure current in a wide range with high sensitivity.

  By installing the pair of potential detection electrodes 23a and 23b in the vicinity of the water surface, for example, in the ocean, the current propagating on the water surface or in the water can be measured. That is, current can be measured with high sensitivity even on the water surface or in water.

[Modification 1 of the first embodiment]
In the first modification of the first embodiment, a potential detection electrode having a coaxial cylindrical structure as shown in FIG. Since the configuration other than the potential detection electrode is the same as that described in the first embodiment, the description thereof will be omitted, and the potential detection electrode having a coaxial cylindrical structure as shown in FIG. 2 will be described below.

  That is, in Modification 1, as shown in FIG. 2, as a pair of potential detection electrodes 23a and 23, a potential detection electrode 24a having a coaxial cylindrical structure made of a conductive metal having a hole, for example, a mesh structure is provided. 24b is used.

  The potential detection electrode 24a on the outer cylinder side is connected to a terminal electrode 21a provided on the light emitter 1 via an electric wire 22a. The potential detection electrode 24b on the inner cylinder side is connected to a terminal electrode 21b provided on the light emitter 1 via an electric wire 22b. The relative positions of the potential detection electrode 24a on the outer cylinder side and the potential detection electrode 24b on the inner cylinder side are held by the insulating supports 13a, 13b, 13c, and 13d. The number of insulating supports 13 is arbitrary.

  The potential detection electrodes 24a and 24b are arranged so as to be substantially perpendicular to the water surface by providing the float 11e via the insulating members 12a to 12d. Alternatively, the float 11e may be omitted, and the potential detection electrodes 24a and 24b may be fixed to the casing of the light emitter 1 using the insulating members 12a to 12d.

  According to the current measuring device to which the potential detection electrode having the coaxial cylindrical structure configured as described above is applied, it is possible to detect a current in the direction of 360 degrees with respect to the horizontal plane between the potential detection electrodes 24a and 24b. Therefore, it is possible to measure the current in a wider range and with higher sensitivity than the current measuring device of the first embodiment.

[Modification 2 of the first embodiment]
In the second modification of the first embodiment, a potential detection electrode having a concentric sphere structure as shown in FIG. 3 is used as the pair of potential detection electrodes 23a and 23b. Since the configuration other than the potential detection electrode is as described in the first embodiment, the description thereof will be omitted, and the following description will be made on a potential detection electrode having a concentric sphere structure as shown in FIG.

  That is, in Modification 3, as shown in FIG. 3, as a pair of potential detection electrodes 23a and 23, potential detection electrodes 25a having a concentric sphere structure made of a conductive metal having a hole, for example, a mesh structure. 25b is used.

  The outer potential detection electrode 25a is connected to a terminal electrode 21a provided on the light emitter 1 via an electric wire 22a. The inner potential detection electrode 25b is connected to a terminal electrode 21b provided on the light emitter 1 via an electric wire 22b. The relative positions of the outer potential detection electrode 25a and the inner potential detection electrode 25b are held by insulating supports 14a, 14b, and 14c. The number of insulating supports 14 is arbitrary.

  The potential detection electrodes 25a and 25b are arranged at a predetermined depth with respect to the water surface so that at least a part thereof is below the water surface by providing the floats 11a and 11b via the insulating members 12a and 12b. I try to do it. Alternatively, the floats 11a and 11b may be omitted, and the potential detection electrodes 25a and 25b may be fixed to the casing of the light emitter 1 using the insulating members 12a and 12b.

  According to the current measurement device to which the concentric sphere-structure potential detection electrode configured as described above is applied, current in the entire circumferential direction can be detected between the potential detection electrodes 25a and 25b. Therefore, it is possible to measure the current in a wider range and with higher sensitivity than the current measuring device of the first embodiment.

[Second Embodiment]
The current measurement device according to the second embodiment includes a plurality of current measurement devices according to the first embodiment. However, only one of the calculation unit 5 and the display unit 6 is shared.

  4 and 5 are conceptual diagrams for explaining a configuration example of the current measuring apparatus according to the second embodiment. In FIG. 4, the float 11, the insulating member 12, and the insulating supports 13, 14, and 15 are omitted to avoid unnecessary complications. In the figure, the same parts as those in the first embodiment are denoted by the same reference numerals to avoid redundant description.

  As shown in FIG. 4, the current measuring device of the present embodiment is formed by arranging a plurality of sets (# 1 to # 5) including the light emitter 1 and the electrode unit 2 at different positions in the water surface direction. In FIG. 4, only five groups (# 1 to # 5) are shown, but this is an example, and the present invention is not limited to five groups.

  4 illustrates the pair of potential detection electrodes 23a and 23b as shown in FIG. 1 as the potential detection electrodes in the electrode unit 2, but the present invention is not limited to this, and as shown in FIG. It is also possible to use potential detecting electrodes 24a and 24b having a coaxial cylindrical structure, and potential detecting electrodes 25a and 25b having a concentric sphere structure as shown in FIG. A potential detection electrode having a different configuration may be used for each set.

  FIG. 5 illustrates the configuration of the casing A ′ applied to the current measuring device of this embodiment. The housing A ′ is provided with the light receiving portions 4 according to the number of sets. FIG. 5 shows that five light receiving sections 4 (# 1 to # 5) are provided in the casing A ′ in response to the five sets (# 1 to # 5) provided in FIG. Is shown.

  As a result, the light receiving unit 4 (# 1) detects the light input via the optical fiber 3 (# 1) and converts it into an electrical signal, and the light receiving unit 4 (# 2) receives the optical fiber 3 ( The light input via # 2) is detected and converted into an electrical signal, and the light receiving unit 4 (# 3) detects the light input via the optical fiber 3 (# 3) The light receiving unit 4 (# 4) detects the light input via the optical fiber 3 (# 4) and converts it into an electrical signal. The light receiving unit 4 (# 5) 3 (# 5) is detected and converted into an electrical signal.

  The calculation unit 5 receives an electrical signal from each of the light receiving units 4 (# 1 to # 5), and calculates a current value or a current density corresponding to the electrical signal.

  According to the current measurement device of the present embodiment having the above configuration, it is possible to acquire a wider range of current values or current densities in the water surface direction. Further, the display unit 6 displays the current value or current density calculated by the calculation unit 5 in association with the position of the corresponding pair of potential detection electrodes, thereby grasping the two-dimensional distribution of the current value or current density. It becomes possible.

[Modification of Second Embodiment]
In the second embodiment, as shown in FIG. 4, a plurality of pairs of potential detection electrodes 23a (# 1 to # 5) and 23b (# 1 to # 5) are arranged at different positions in the water surface direction. As described above, in the modification of the second embodiment, a plurality of pairs of potential detection electrodes 23a (# 1 to # 5) and 23b (# 1 to # 5) are arranged at different water depths. This is achieved by changing the lengths of the insulating members 12a and 12b having the floats 11a and 11b fixed at one end and the other ends connected to the tips of the potential detection electrodes 23a and 23b.

  FIG. 6 is a conceptual diagram for explaining a configuration example of the current measuring device according to the modification of the second embodiment. In FIG. 6, the insulating support 15 is omitted in order to avoid unnecessary complications. Moreover, in the following description, about the site | part already demonstrated, the same number is attached | subjected and the detailed description is abbreviate | omitted.

  That is, in this modification, as shown in FIG. 6, a plurality of sets of a pair of potential detection electrodes 23a and 23b are arranged at positions having different depths from the water surface. And the light-emitting body 1 (# 1- # 3) corresponding to each group is provided. When light is emitted from each of the light emitters 1 (# 1 to # 3), the light is stored in the casing A ′ as shown in FIG. 5 by the corresponding optical fibers 3 (# 1 to # 3). It is sent to the corresponding light receiving unit 4 (# 1 to # 3).

  In FIG. 6, three sets of potential detection electrodes 23a (# 1 to # 3) and 23b (# 1 to # 3) are arranged, and in accordance with this, three light emitters 1 (# 1 to # 3) are arranged. However, this is merely an example, and the present invention is not limited to three sets.

  FIG. 6 illustrates a pair of potential detection electrodes 23a and 23b as illustrated in FIG. 1 as the potential detection electrodes 23a (# 1 to # 3) and 23b (# 1 to # 3). The potential detection electrodes 24a and 24b having a coaxial cylindrical structure as shown in FIG. 2 and the potential detection electrodes 25a and 25b having a concentric sphere structure as shown in FIG. 3 can also be used. A potential detection electrode having a different configuration may be used for each set.

  With the configuration as described above, it is possible to acquire the current value or current density at a place where the water depth is different in addition to the water surface direction. That is, a wider range of current can be measured. Further, the display unit 6 displays the current value or current density calculated by the calculation unit 5 in association with the corresponding three-dimensional position of the measurement unit M, thereby grasping the three-dimensional distribution of the current value or current density. It is also possible.

[Third Embodiment]
The current measurement device according to the third embodiment is a modification of the current measurement device according to the first embodiment. As illustrated in FIG. 7, a battery 7, a position information detection unit 8, The storage unit 9 is added and the display unit 6 is deleted. In FIG. 7, the same parts as those in the first embodiment are given the same numbers, and redundant explanation is avoided.

  In FIG. 7, as an example of the configuration of the potential detection electrode, the potential detection electrodes 23a and 23b having the configuration as shown in FIG. 1 are illustrated as an example. However, the configuration of the potential detection electrode is as shown in FIG. It is not limited to the potential detection electrodes 23a and 23b, but may be the potential detection electrodes 24a and 24b having a coaxial cylindrical structure as shown in FIG. 2 or the potential detection electrodes 25a and 25b having a concentric sphere structure as shown in FIG. good.

  The battery 7 supplies driving power for the current measuring device. In particular, necessary power is supplied to each component in the housing A.

  The position information detection unit 8 detects the position information of the current measuring device, in particular, the potential detection electrodes 23a and 23b by using, for example, GPS (Global Positioning System). And the positional information which is a detection result is sent to the memory | storage part 9. FIG.

  As can be seen by comparing FIG. 7 with FIG. 1, the display unit 6 is deleted in FIG. 7. The calculation unit 5 sends a calculation result that is a current value or a current density to the storage unit 9.

  The storage unit 9 stores the current value or current density, which is the calculation result sent from the calculation unit 5, and the position information sent from the position information detection unit 8 in association with each other. In addition, a time detection unit (not shown) is further provided in the housing A, and the time detection unit provides time information to the storage unit 9 so that the storage unit 9 can obtain the calculation result from the calculation unit 5 and the position information. When the positional information from the detection unit 8 is associated and stored, the time information may be further associated and stored.

  According to the current measuring device of the present embodiment configured as described above, since the battery 7 is provided, it can operate independently. Therefore, when a large number of current measuring devices configured as shown in FIG. 7 are arranged on the ocean or the like, even if one of them does not function due to a failure or the like, other normal current measuring devices have an effect on it. It is possible to continue the operation alone without receiving.

  In addition, since each casing A can operate independently in this way, the casing A becomes nonfunctional due to a failure or the like, and is removed for repair or inspection, or when the casing A is replaced. Or, even when the casing A is reinstalled after repair or inspection, work such as external wiring of the casing A does not occur.

  Further, even when the current measurement device, particularly the position of the potential detection electrode 23 is moved from a predetermined position due to the influence of waves or the like on the ocean, the position information detection unit 8 is connected to the potential detection electrode 23a, Since the position information 23b is detected, the exact position where the current is generated can be grasped.

[Fourth Embodiment]
The current measuring device according to the fourth embodiment is a modification of the current measuring device according to the first to third embodiments, and as shown in FIG. By providing for, the light-emitting body 1 and the light-receiving part 4 are directly connected without using the optical fiber 3 and are different. Moreover, although not shown in figure, the connection of the light-receiving part 4 and the calculating part 5 can employ | adopt direct connection, the connection via an optical fiber, etc.

  According to the configuration as described above, the optical signal emitted from the light emitter 1 can be converted into an electrical signal with high sensitivity in the light receiving unit 4, so that the current value or current density can be obtained with high accuracy. Become.

  Furthermore, by applying such a configuration to a current measuring device as shown in FIG. 4 or a current measuring device as shown in FIG. 6, a two-dimensional distribution or a three-dimensional distribution of current values or current densities can be obtained with high accuracy. It is also possible.

[Other Embodiments]
In 1st thru | or 4th embodiment, although it is necessary to arrange | position about the electrode part 2 on the surface of water or in water, there is no restriction | limiting of an installation place about another component. Therefore, the casing A in which only the light emitter 1 is arranged on the water surface and the components after the light receiving unit 4 (the calculation unit 5, the display unit 6, the battery 7, the position information detection unit 8, the storage unit 9 and the like) are stored, You may make it provide in floating facilities etc. The configuration of the casing A is not limited to the configuration shown in FIGS. 1 and 7. For example, the display unit 6 is arranged outside the casing A, and the casing A is arranged on the water surface. On the other hand, the display unit 6 may be provided in a water facility or the like.

  In addition, by applying wireless communication between the light receiving unit 4 and the calculation unit 5, the electrical signal converted by the light receiving unit 4 can be transmitted to land facilities by wireless communication. Components can also be placed on land facilities.

  Moreover, the combination of each embodiment is free. For example, a plurality of light emitters 1 according to the first modification of the first embodiment may be provided, and a plurality of sets of potential detection electrodes may be arranged at different depths from the water surface. In addition, the battery 7, the position information detection unit 8, and the storage unit 9 may be applied to the current measurement devices of the first and second embodiments to enable independent current measurement.

  Although several embodiments of the present invention have been described, these embodiments are presented by way of example and are not intended to limit the scope of the invention. These embodiments can be implemented in various other forms, and various omissions, replacements, and changes can be made without departing from the spirit of the invention. These embodiments and their modifications are included in the scope and gist of the invention, and are also included in the invention described in the claims and the equivalents thereof.

DESCRIPTION OF SYMBOLS 1 ... Light-emitting body, 2 ... Electrode part, 3 ... Optical fiber, 4 ... Light-receiving part, 5 ... Calculation part, 6 ... Display part, 7 ... Battery, 8 * ..Position information detector, 9 ... Storage, 11 ... Float, 12 ... Insulating member, 13, 14, 15 ... Insulating support, 21 ... Terminal electrode, 22 ... Electric wire , 23, 24, 25 ... potential detection electrodes, A ... casing, B ... casing

Claims (7)

  1. A current measuring device for measuring current generated on the surface of water or in water,
    A pair of electrodes disposed on the surface of the water or in water;
    A light emitter that emits light having an intensity corresponding to a potential difference between the pair of electrodes;
    An arithmetic unit that calculates a current value based on the intensity of light emitted by the light emitter;
    Current measuring device equipped with.
  2.   The current measuring device according to claim 1, comprising an electrode having a coaxial cylindrical structure as the pair of electrodes.
  3.   The current measuring device according to claim 1, comprising concentric sphere electrodes as the pair of electrodes.
  4.   4. The device according to claim 1, wherein a plurality of sets of the pair of electrodes are provided, and each set is arranged by changing at least one of a position in the water surface direction and a position in the water depth direction. Current measuring device.
  5. A driving power source for the current measuring device;
    A position detector for detecting the position of the pair of electrodes;
    A storage unit for storing the current value calculated by the calculation unit in association with the position of the corresponding pair of electrodes detected by the position detection unit;
    The current measuring device according to any one of claims 1 to 4, further comprising:
  6.   The current measuring device according to claim 5, wherein the storage unit further stores the current value in association with time information.
  7. An optical fiber for propagating light emitted by the light emitter;
    A light receiving portion for receiving the light propagated by the optical fiber,
    The calculation unit according to any one of claims 1 to 6, wherein the calculation unit calculates a current value based on an intensity of light received by the light receiving unit instead of an intensity of light emitted by the light emitter. The current measuring device described.
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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2019087589A1 (en) * 2017-10-30 2019-05-09 国立研究開発法人産業技術総合研究所 Material for measuring electrical conductivity, electrical conductivity measuring film, electrical conductivity measuring device, and electrical conductivity measuring method, and material for measuring electrical resistivity, electrical resistivity measuring film, electrical resistivity measuring device, and electrical resistivity measuring method

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JPS55128160A (en) * 1979-03-27 1980-10-03 Mitsubishi Electric Corp Measuring device for voltage by light
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JP2007127589A (en) * 2005-11-07 2007-05-24 Universal Shipbuilding Corp Electric field detection method and device, and program for electric field detection method; and mobile position etc. estimation detection method and device, and program for mobile position etc. estimation detection method
US20090140723A1 (en) * 2007-12-03 2009-06-04 Marit Ronaess Method and apparatus for reducing induction noise in measurements made with a towed electromagnetic survey system

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WO2019087589A1 (en) * 2017-10-30 2019-05-09 国立研究開発法人産業技術総合研究所 Material for measuring electrical conductivity, electrical conductivity measuring film, electrical conductivity measuring device, and electrical conductivity measuring method, and material for measuring electrical resistivity, electrical resistivity measuring film, electrical resistivity measuring device, and electrical resistivity measuring method

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