Sensor unit

Abstract

To solve the problem that it is difficult to arrange a sensor unit on an electric wire conventionally.SOLUTION: A sensor unit 1 comprises: a housing 2 configured to be able to change from an open state in which a space between a first housing 10 and a second housing 20 is opened via a hinge portion 3 to a closed state in which the space between the first housing 10 and the second housing 20 is closed; measuring means 5 that is accommodated inside the housing 2 and performs measurement related to an energized state of an electric wire; an accommodation portion 14 that is provided on the first housing 10 and is a groove-shaped recess configured to be able to accommodate the electric wire; and a tool attachment portion 18 that is provided on the first housing 10 and is configured to be able to attached to / detached from an indirect hot-line tool 95. The housing 2 is configured to be able to change from the open state to the closed state in a state where the indirect hot-line tool 95 is attached to the tool attachment portion 18 and can be easily arranged on the electric wire.SELECTED DRAWING: Figure 2

Description

TECHNICAL FIELD

[0001] The present invention relates to a sensor unit, and more particularly to a sensor unit that is installed on an electric wire as a measurement target and used to perform measurements related to the energization state of the electric wire.

BACKGROUND ART

[0002] Conventionally, various devices arranged to sandwich an electric wire for measuring the energization state of the electric wire have been used.

[0003] For example, Patent Document 1 below describes a configuration of a voltage detection device that is arranged to be suspended from an electric wire. This voltage detection device is configured such that after the electric wire is placed at a predetermined position, the upper holder is pressed to clamp the electric wire, so that the device can be disposed on the electric wire.

[0004] However, the voltage detection device as described in Patent Document 1 has a problem that it is difficult to perform construction without power interruption, that is, to attach the device to a live wire. That is, since attaching such a voltage detection device requires work to be performed close to the electric wire, it is not appropriate to perform work on a live wire. When performing work on a live wire in this manner, an uninterrupted construction method (which may also be referred to as an indirect live wire construction method) in which work is performed using a so-called indirect live wire tool is adopted. There is a sensor unit configured to be attached to an electric wire using such an indirect live wire tool (see, for example, Patent Document 2 and Patent Document 3 below).

PRIOR ART DOCUMENTS

PATENT DOCUMENTS

[0005]

PATENT DOCUMENT 1

PATENT DOCUMENT 2

PATENT DOCUMENT 2

SUMMARY OF THE INVENTION

[0006] However, when considering the actual work involved in attaching the sensor units described in Patent Documents 2 and 3 above to electric wires so that they can measure, they do not necessarily have a desirable structure. In other words, the worker must lift the sensor unit using an indirect live-line tool and work directly beneath it, making it difficult to grasp the positional relationship between the electric wire and the part of the sensor unit where the electric wire is to be placed. Therefore, there is a problem in that it is difficult to place the sensor unit on the electric wire.

[0007] This invention was made to solve these problems and aims to provide a sensor unit that can be easily installed on electric wires. [Means for solving the problem]

[0008] The sensor unit of this first invention has an upper first housing and a lower second housing that are rotatable relative to each other via a hinge, and is configured to be able to move from an open state where the gap between the first housing and the second housing is open to a closed state where the gap between the first housing and the second housing is closed so that an electric wire is positioned at the position between the first housing and the second housing; a measuring means housed inside the housing for measuring the energization state of the electric wire at the position in the closed state; a housing portion provided in the first housing, which is a recess configured to accommodate the electric wire positioned at the position; and a tool mounting portion provided in the first housing, which is configured to allow the attachment and detachment of an indirect live-line tool, and the housing is configured to be able to move from an open state to a closed state with the indirect live-line tool attached to the tool mounting portion.

[0009] This configuration makes it easy to place the sensor unit on the power line.

[0010] Furthermore, the sensor unit of this second invention, compared to the first invention, is a sensor unit in which, in the front-to-back direction which is the horizontal direction perpendicular to the electric wire at the placement position, the position in which an indirect live-line tool can be attached to the tool attachment part is located between the hinge part and the housing part.

[0011] This configuration makes it easier to install the sensor unit on the power line.

[0012] Furthermore, the sensor unit of this third invention is a sensor unit in which, compared to the first or second invention, the difference between the angle of the second housing relative to the first housing in the open state and the angle of the second housing relative to the first housing in the closed state is 90 degrees or less.

[0013] This configuration makes it difficult for the center of gravity to change when the housing is opened and closed, and makes it easy to position the sensor unit on the wires.

[0014] Furthermore, the sensor unit of this fourth invention is a sensor unit in which, with respect to any one of the first to third inventions, the housing has engaging means configured such that the first housing and the second housing engage by snap-fit ​​when in a closed state.

[0015] This configuration makes it easy to maintain a closed state, allowing the sensor unit to be easily placed on the wire.

[0016] Furthermore, the sensor unit of this fifth invention is a sensor unit in which, with respect to any one of the first to fourth inventions, the measuring means has a detection unit that is positioned along the wire in the arrangement position when closed, and the detection unit is attached to a second housing.

[0017] This configuration makes it easier to position the center of gravity downwards when the unit is closed, thereby stabilizing the orientation of the sensor unit. [Effects of the Invention]

[0018] According to the sensor unit of the present invention, the work of arranging it on an electric wire can be easily performed. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] [Figure 1] A diagram for illustrating the closed state of the sensor unit according to the present embodiment [Figure 2] A diagram for illustrating the open state of the same sensor unit [Figure 3] An exploded perspective view of the same sensor unit [Figure 4] An exploded perspective view of the same sensor unit viewed from a different direction [Figure 5] A diagram for illustrating the procedure of attaching the same sensor unit to an electric wire MODE FOR CARRYING OUT THE INVENTION

[0020] Hereinafter, embodiments of the sensor unit and the like will be described with reference to the drawings.

[0021] In the following description, the coordinates shown in the drawings are common to all the drawings. The top and bottom of the coordinates may be referred to as the up-down direction, the right and left may be referred to as the left-right direction, and the near side and the far side may be referred to as the front-rear direction. The up-down direction is a direction perpendicular to a hypothetically conceived horizontal plane for illustrative purposes. The up-down direction, the left-right direction, and the front-rear direction are directions perpendicular to each other. The left-right direction may also be referred to as a first direction, and the front-rear direction may also be referred to as a second direction. In the following, the shapes and positional relationships of the respective parts may be described by indicating the respective directions in this way, but these are defined for the convenience of explanation only, except as explicitly stated in relation to specific advantages, and do not limit the orientation, posture, and the like during use of the sensor unit and the like according to the present invention.

[0022] (Embodiment)

[0023] The outline of this embodiment is as follows: The sensor unit has an openable and closable structure and is configured to be positioned on an electric wire by sandwiching the wire between the two halves. The sensor unit has a housing that is divided into upper and lower halves and can be opened and closed by rotating via a hinge. The upper housing of the sensor unit is provided with a recessed portion that can be attached to an electric wire and a tool attachment portion to which an indirect live-line tool can be attached. A worker below the electric wire can position the sensor unit on the electric wire by aligning the position of the sensor unit so that the electric wire is positioned in the portion that can be attached to the electric wire. From below, the position of the electric wire, the position of the entire sensor unit, and the position of the portion of the sensor unit that can be attached to the electric wire can be easily confirmed.

[0024] In this embodiment, it is preferable that the tool mounting portion is located in a position that does not obstruct attention when viewed from below during operation. It is also preferable that the tool mounting portion is located between the concave portion and the hinge portion in the front-rear direction. The opening angle of the housing is preferably 90 degrees or less, and the detection portion for measurement is preferably located in the lower housing, in which case the stability of the sensor unit can be ensured. It is preferable that the upper and lower housings are configured to be temporarily held in the closed state by a snap fit. The configuration of such a sensor unit 1 will be described below.

[0025] In this embodiment, the sensor unit 1 is used, for example, in a ground fault detection system used in a power distribution system for three-phase AC high-voltage power. The power distribution system distributes power from substations to individual consumers through power lines (distribution lines). The sensor unit 1 is configured to be placed on power lines at any point in the power distribution system. For example, the sensor unit 1 may be placed on each line between substations and switches in the power distribution system, or on each section between branching points from the main line, but is not limited to these.

[0026] The sensor unit 1, which is positioned on the electric wire, is configured to measure the energized state of the electric wire. Measuring the energized state means measuring the current flowing through the electric wire, measuring the voltage of the electric wire, or both. In other words, in this embodiment, the sensor unit 1 is configured to measure the current and voltage of the electric wire to which it is attached. It may also be possible to measure only one of them.

[0027] The sensor unit 1 can output measurement results to an external processing device (not shown) via a signal line. This allows the processing device to utilize the measurement results of the sensor unit 1. Utilization of measurement results includes, but is not limited to, storing the measurement results or various information acquired using them, or outputting them to an external device. The processing device may be housed inside the sensor unit 1. The sensor unit 1 may include such a processing device, or it may not include such a processing device. The sensor unit 1 may be called a sensor head or a probe.

[0028] First, the general configuration of the sensor unit 1 according to this embodiment will be described.

[0029] Figure 1 is a diagram illustrating the closed state of the sensor unit 1 according to this embodiment. Figure 2 is a diagram illustrating the open state of the sensor unit 1. Figure 3 is an exploded perspective view of the sensor unit 1. Figure 4 is an exploded perspective view of the sensor unit 1 from a different direction.

[0030] In Figure 1, the upper section shows a perspective view from the upper left front, and the lower section shows a left side view. In Figure 2, the upper section shows a perspective view from the lower left front, and the lower section shows a left side view. In the following figures and their descriptions, only the main components are mentioned or illustrated, but the sensor unit 1 may be composed of components that are not mentioned or illustrated.

[0031] As shown in the figure, the sensor unit 1 has a configuration in which various components are housed inside the housing 2. For example, the measuring means 5 and the shielding member 7 are housed inside the housing 2. The housing 2 is configured to house the measuring means 5 and the like, and is positioned around the electric wire 90 located at position P, as will be described later.

[0032] In this embodiment, the housing 2 has an elliptical cylindrical shape when viewed from the side. That is, the sensor unit 1 has an elliptical cylindrical shape where the left-right direction is the height direction. However, the shape of the housing 2 is not limited to this.

[0033] The enclosure 2 comprises a first enclosure 10 and a second enclosure 20. The enclosure 2 is configured to be divisible into two parts: the first enclosure 10 and the second enclosure 20. The enclosure 2 is configured to be installed on the electric wire 90, with the electric wire 90 sandwiched between the first enclosure 10 and the second enclosure 20.

[0034] In this embodiment, the first housing 10 includes a first hinge portion 11, an upper unit arrangement portion 13, a housing portion 14, an upper coil arrangement portion 15, and a tool mounting portion 18. The first housing 10 is made of, for example, resin. The first housing 10 is constructed by integrally molding, for example, resin. A portion of it may be made of a material other than resin. In addition, some components or two or more members may be joined together by adhesive or mechanical methods (for example, by screwing).

[0035] The second housing 20 includes a second hinge portion 21, a lower unit arrangement portion 23, and a lower coil arrangement portion 25. The second housing 20 is made of, for example, resin. The second housing 20 is constructed by integrally molding, for example, resin. A portion of it may be made of a material other than resin. In addition, some components or two or more members may be joined together by adhesive or mechanical methods (for example, by screwing).

[0036] In this embodiment, the first housing 10 and the second housing 20 are rotatably assembled to each other via a hinge portion 3. The hinge portion 3 consists of a first hinge portion 11 located at the rear of the first housing 10 and a second hinge portion 21 located at the rear of the second housing 20. The first hinge portion 11 and the second hinge portion 21 are engaged, allowing the first housing 10 and the second housing 20 to rotate relative to each other around a rotation axis. The rotation axis of the hinge portion 3 is, for example, parallel to the left-right direction. The hinge portion 3 is located on the rear side of the housing 2. That is, the second housing 20 is rotatable relative to the first housing 10 in a direction in which its front side is displaced downward.

[0037] The housing 2 is designed to be able to reversibly change its state between an open state, where the gap between the first housing 10 and the second housing 20 is open around the hinge portion 3 as shown in Figure 2, and a closed state, where the gap between the first housing 10 and the second housing 20 is closed as shown in Figure 1.

[0038] In this embodiment, the sensor unit 1 is typically used attached to the electric wire 90 in a configuration where the first housing 10 is positioned on the upper side and the second housing 20 is positioned on the lower side. For the sake of explanation, this typical configuration is referred to as the "normal configuration." In the normal configuration, if the orientation of the first housing 10 is the same in both the open and closed states, then the position of the second housing 20 in the closed state is higher than the position of the second housing 20 in the open state. The first housing 10 may also be referred to as the upper housing, and the second housing 20 as the lower housing.

[0039] The maximum difference between the angle between the first housing 10 and the second housing 20 in the closed state and the angle between the first housing 10 and the second housing 20 in the open state is configured to be 90 degrees or less. More preferably, in this embodiment, the difference between the angle of the second housing 20 relative to the first housing 10 in the open state and the angle of the second housing 20 relative to the first housing 10 in the closed state is configured to be 60 degrees or less. Such angle limitations can be achieved, for example, by setting the structure of the hinge portion 3, but the method of limitation is not limited to this. Furthermore, the second housing 20 may be configured to rotate relative to the first housing 10 until a wider angle is achieved in the open state. Since the hinge portion is located on the rear side and the angle range in which the housing 2 can be opened and closed is configured to be less than or equal to the predetermined angle described above, the position of the center of gravity does not change easily when the housing 2 is opened and closed, and the sensor unit 1 is more likely to remain stable in the position where the first housing 10 is on the upper side. When the angle range in which the housing 2 can be opened and closed is 60 degrees or less, the position of the center of gravity when the housing 2 is opened and closed becomes even less likely to change.

[0040] The housing 2 is configured to be able to be closed from an open state by positioning the electric wire 90 at position P between the first housing 10 and the second housing 20. That is, with the sensor unit 1 properly attached to the electric wire 90, the electric wire 90 is positioned at a predetermined position P relative to the sensor unit 1. Position P can be said to be the position of the electric wire 90 relative to the sensor unit 1 that allows for proper measurement using the sensor unit 1 in the closed state. In this embodiment, as will be described later, the position of the electric wire 90 placed in the housing 14 can be said to be position P.

[0041] In this embodiment, the housing 2 has an engaging means 24. The engaging means 24 is a structure configured such that the first housing 10 and the second housing 20 engage with each other when closed. The engaging means 24 may also be called an engaging structure. In this embodiment, the engaging means 24 has a snap fit provided on at least one of the first housing 10 and the second housing 20. A snap fit, in this context, refers to a structure in which an engaging portion capable of engaging with another member is formed on a part of a beam-shaped portion extending in a predetermined direction. The beam-shaped portion of the snap fit is flexible in a direction perpendicular to the predetermined direction and is configured to be displaceable so that the engaging portion moves closer to or further away from the other member.

[0042] The engaging means 24 consists of, for example, a snap fit 242 formed on a portion that protrudes upward from the second housing 20 and an engaged portion 142 formed on the first housing 10. That is, the snap fit 242 is configured to have a portion that can engage with the engaged portion 142, for example, in the left-right direction. The engaged portion 142 also has a shape that can engage with the snap fit 242 in the left-right direction. The engaged portion 142 can engage with the snap fit 242 when it is in the closed state. When moving from the open state to the closed state, as the second housing 20 is displaced relative to the first housing 10, a part of the snap fit 242 comes into contact with the engaged portion 142 and a part of the snap fit 242 deforms. When it remains in the closed state, the snap fit 242 engages with the engaged portion 142, and the deformation of the snap fit 242 is slightly mitigated. As a result, the engaging means 24 provides a state in which the first housing 10 and the second housing 20 are engaged with each other. Unless a large external force is applied that would disengage the engagement, the housing 2 will remain engaged in the closed state by the engagement means 24.

[0043] In this embodiment, pairs of snap-fit ​​242 and engaged portion 142 constituting the engaging means 24 are provided at multiple locations that are different from each other in the left-right direction. Specifically, pairs of snap-fit ​​242 and engaged portion 142 are provided at two locations: near the right side and near the left side of the housing 2. By providing the engaging means 24 at two different locations in the longitudinal direction in this way, the state in which the housing 2 is engaged by the engaging means 24 is maintained more stably.

[0044] The engaging means 24 may have a snap-fit ​​that protrudes from the first housing 10 to the second housing 20. Alternatively, the second housing 20 (or the first housing 10) may have a projection that fits into the first housing 10 (or the second housing 20) when closed, and the first housing 10 (or the second housing 20) may have a snap-fit ​​that can engage with this projection. Furthermore, the configuration of the engaging means 24 is not limited to these. A structure other than the snap-fit ​​structure may be used.

[0045] The tool mounting section 18 is provided, for example, on the left side of the first housing 10. That is, the tool mounting section 18 is provided near one end of the electric wire 90 in the longitudinal direction at the placement position P within the first housing 10. The tool mounting section 18 may be provided in a different part of the first housing 10, or it may be provided on the second housing 20. As described above, the tool mounting section 18 is integrally molded with the other parts of the first housing 10 using resin. A part of the tool mounting section 18 may be integrally molded with the first housing 10 using resin. Alternatively, the tool mounting section 18 may be assembled to the molded first housing 10.

[0046] Here, the tool mounting section 18 is provided in the first housing 10 between the housing section 14 and the hinge section 3, or first hinge section 11, in the front-to-back direction. In other words, the tool mounting section 18 is located between the hinge section 3 and the electric wire 90 in the front-to-back direction, which is the horizontal direction perpendicular to the direction of the electric wire 90 at the placement position P.

[0047] In Figure 1, the wire 90 positioned at position P is shown by a dashed line. The wire 90 at position P passes through approximately the center of the sensor unit 1. The longitudinal direction of the wire 90 at position P relative to the sensor unit 1 is approximately the same as the left-right direction of the sensor unit 1. Even in directions perpendicular to the wire 90, a certain distance is maintained from the wire 90 to the outer surface of the housing 2.

[0048] The housing section 14 is a part configured to accommodate the electric wire 90 located at the placement position P. With the electric wire 90 located in the housing section 14, the housing 2 can be closed while the electric wire 90 is housed inside the housing 2. In this embodiment, the housing section 14 is formed in the first housing 10. The housing section 14 may also be provided in both the first housing 10 and the second housing 20.

[0049] The housing section 14 is a recess formed in a side view from the surface of the first housing 10 facing the second housing 20, so as to be recessed in a direction away from the second housing 20. In other words, the housing section 14 is a recess that opens downward. The housing section 14 has a groove-shaped recess that runs along the left-right direction. That is, the housing section 14 is formed in the first housing 10 such that the recessed portions overlap each other in the left-right direction, thereby enabling the electric wire 90 to be housed with the left-right direction as the longitudinal direction. In this embodiment, the first housing 10 is provided with a plurality of plate-like portions that are substantially perpendicular to the left-right direction in the vicinity of both the left and right sides. The housing section 14 is formed so as to be missing a part of each plate-like portion, and the electric wire 90 can be housed in the housing section 14 with the left-right direction as the longitudinal direction of the first housing 10 as a whole.

[0050] In the closed state and normal orientation, the first housing 10 can be said to occupy the upper half of the housing 2, and the second housing 20 can be said to occupy the lower half of the housing 2. In the closed state, which is the normal orientation, the housing 2 can be said to be divided into two parts (first housing 10 and second housing 20) with a horizontal plane passing through the center of the housing 2 as the boundary.

[0051] Furthermore, the enclosure 2 may be divided into three or more parts. Also, the first enclosure 10 and the second enclosure 20 may be separated by a more complex boundary.

[0052] In the first housing 10, the upper unit placement section 13 is formed to be recessed upward from the bottom surface of the first housing 10 (the surface facing the second housing 20). A cable contact section 60 is arranged in the upper unit placement section 13, as will be described later.

[0053] The upper coil arrangement section 15 is located near the right side of the first housing 10. It can also be said that the upper coil arrangement section 15 is located to the right of the upper unit arrangement section 13. The upper coil arrangement section 15 is formed to recess upward from the bottom surface of the first housing 10. The upper coil arrangement section 15 and the upper unit arrangement section 13 are separated, for example, by a rib-shaped partition wall formed in the first housing 10. As will be described later, the components of the current sensor section 40 are arranged in the upper coil arrangement section 15.

[0054] A cap placement section 16 is provided on the front side of the upper coil placement section 15. The first cap 41 of the current sensor section 40 is attached to the cap placement section 16.

[0055] In the second housing 20, the lower unit placement section 23 is formed to be recessed downward from the upper surface of the second housing 20 (the surface facing the first housing 10). A detection unit 51 is arranged in the lower unit placement section 23, as will be described later.

[0056] The lower coil arrangement section 25 is located near the right side of the second housing 20. It can also be said that the lower coil arrangement section 25 is located to the right of the lower unit arrangement section 23. The lower coil arrangement section 25 is formed to be recessed downward from the upper surface of the second housing 20. The lower coil arrangement section 25 and the lower unit arrangement section 23 are separated, for example, by a rib-shaped partition wall formed in the second housing 20. As will be described later, the components of the current sensor section 40 are arranged in the lower coil arrangement section 25.

[0057] A cap placement section 26 is provided on the front side of the lower coil placement section 25. The second cap 42 of the current sensor section 40 is attached to the cap placement section 26.

[0058] In the closed state, the housing 2 is used with the first housing 10 and the second housing 20 fastened together by fastening members 88. This prevents the housing from unintentionally opening due to external forces, disturbances, etc. The fastening members 88 are, for example, bolts that engage with female threads formed on the first housing 10 side, and are provided on the front and rear sides of the housing 2, respectively. The fastening members 88 are positioned so that the recesses 203 formed on the surface of the second housing 20 serve as the seating surfaces. The fastening members 88 can be tightened from below the sensor unit 1 using a tool. Therefore, the sensor unit 1 can be easily installed using an indirect live-line tool 95 or the like.

[0059] Furthermore, the bottom of the housing 2 is provided with a tether mounting portion 205 to which a tether member (not shown) can be attached to prevent the sensor unit 1 from falling from a height. The tether mounting portion 205 is an annular portion integrally formed with the second housing 20, but is not limited to this, and may be, for example, an eye bolt attached to the second housing 20.

[0060] In this embodiment, a connector 81 for connecting the signal line 93 is located at the bottom of the housing 2. Since the connector 81 is located at a position that is the bottom surface in the normal orientation, the weather resistance of the connection between the sensor unit 1 and the signal line 93 can be improved.

[0061] The measuring means 5 may also be called the measuring unit. The measuring means 5 is housed inside the housing 2 and measures the energized state of the electric wire 90 located at position P when closed. In this embodiment, the measuring means 5 includes a current sensor unit 40 and a voltage sensor unit 50. The measuring means 5 is configured to measure the current and voltage of the electric wire 90.

[0062] The current sensor unit 40 includes a Rogowski coil 45, a first cap 41, and a second cap 42. As will be described later, the current sensor unit 40 is configured to have an annular portion that surrounds the electric wire 90 when the housing 2 is closed. The current sensor unit 40 is configured to detect the current in the electric wire 90 by the Rogowski coil 45. However, the current sensor unit 40 is not limited to the one using the Rogowski coil 45, and may also be configured to detect the current in the electric wire 90 by a current transformer (CT) type system having a magnetic core (an example of an annular portion) surrounding the electric wire 90 and a coil wound around the magnetic core.

[0063] The first cap 41 is attached to the cap placement section 16 of the first housing 10.

[0064] The second cap 42 is attached to the cap placement section 26 of the second housing 20.

[0065] The Rogowski coil 45 is housed on the right side of the housing 2 so as to surround the electric wire 90 at position P when the housing is closed. The Rogowski coil 45 is housed in the space formed by the upper coil arrangement section 15 and the lower coil arrangement section 25 when the housing is closed. Each end of the Rogowski coil 45 is fitted into the first cap 41 and the second cap 42. When the housing is closed, the bottom surface of the first cap 41 and the top surface of the second cap 42 are close to each other and face each other. In this state, the two ends of the Rogowski coil 45 are close to each other, creating a state in which the Rogowski coil 45 surrounds the electric wire 90 in a ring shape. That is, when the housing 2 is closed, the Rogowski coil 45 forms a ring that surrounds the electric wire 90. Therefore, the current in the electric wire 90 can be detected accurately by the Rogowski coil 45.

[0066] In this embodiment, a connecting wire 45b is drawn out from the Rogowski coil 45 inside the second cap 42 to connect to a circuit board (not shown) on which a circuit for measuring current in the measuring means 5 is provided.

[0067] The Rogowski coil 45 is fixed to a first cap 41, which is fixed at both ends to the first housing 10, and a second cap 42, which is fixed to the second housing 20. Therefore, in the open state, the Rogowski coil 45 flexes as the position of the second cap 42 relative to the first cap 41 changes. Even in this case, the Rogowski coil 45 maintains its fitted state in the upper coil arrangement section 15 and the lower coil arrangement section 25, thereby preventing the Rogowski coil 45 from interfering with the electric wire 90 to be placed, and preventing the wiring of the Rogowski coil 45 from becoming unintended.

[0068] The voltage sensor unit 50 broadly includes a detection unit 51, a cable contact unit 60, and a biasing member 69. The voltage sensor unit 50 is configured to detect the voltage of the electric wire 90 located at position P by the detection unit 51.

[0069] The detection unit 51 is positioned along the electric wire 90 at position P when closed. The detection unit 51 includes a detection unit housing 52, an insulating pad 54, and a cover 56. The detection unit 51 is formed in a box shape as a whole. The detection unit 51 is housed in the lower unit housing 23. That is, the detection unit 51 is attached to the second housing 20.

[0070] The insulating pad 54 is positioned on the upper surface of the detection unit housing 52. Inside the detection unit housing 52, below the insulating pad 54, is an electrode (not shown) for detecting the electric field around the electric wire 90. The electrode is connected to a circuit board (not shown) on which a circuit for measuring voltage in the measuring means 5 is provided.

[0071] The cover 56 is configured to cover the lower side of the detection unit housing 52. Inside the area covered by the detection unit housing 52 and the cover 56, electrodes, circuit boards, and other components constituting the measurement means 5 are arranged. By being covered by the detection unit housing 52 and the cover 56, a certain degree of waterproofing performance is ensured for the internal components.

[0072] The cable contact portion 60 is located above the detection portion 51 when closed. The cable contact portion 60 is located in the first housing 10 and is configured to be able to contact the electric wire 90 at the placement position P. The cable contact portion 60 has a box-shaped outer diameter overall. The cable contact portion 60 is housed in the upper unit placement portion 13 of the first housing 10.

[0073] In the closed state, the electric wire 90 is positioned at position P between the cable contact portion 60 and the detection portion 51. The electric wire 90 at position P is sandwiched between the cable contact portion 60 and the detection portion 51. In other words, the electric wire 90 housed in the housing portion 14 is sandwiched between the cable contact portion 60 and the detection portion 51.

[0074] A contact pad 64 is attached to the lower part of the cable contact portion 60. The contact pad 64 is configured to contact the electric wire 90 at the placement position P and press the electric wire 90 toward the detection unit 51. The contact pad 64 is provided with a guide surface 641 that is recessed upward along the left-right direction. The electric wire 90 comes into contact with the guide surface 641 and is pressed toward the detection unit 51 while being positioned so that its position in the front-rear direction is the appropriate placement position P.

[0075] In this embodiment, the biasing member 69 is, for example, a coil spring. The biasing member 69 may be any other spring, or a material that generates a repulsive force when compressed, such as rubber or sponge. The biasing member 69 is positioned in a compressed state from its natural state. The biasing member 69 is positioned between the upper surface of the cable contact portion 60 and the inner surface of the first housing 10. The biasing member 69 can bias the cable contact portion 60 downward. This ensures that the electric wire 90 is securely held between the cable contact portion 60 and the detection portion 51 when the enclosure is closed.

[0076] The biasing member 69 may be positioned between the detection unit 51 and the second housing 20 to bias the second housing 20 upward. Furthermore, the biasing member 69 may be provided on both the first housing 10 side and the second housing 20 side. In other words, the biasing member 69 only needs to be positioned between the cable contact unit 60 and at least one of the detection unit 51 and the housing 2 to bias at least one of the cable contact unit 60 and the detection unit 51 toward the other.

[0077] The shielding member 7 is, for example, a metal sheet such as copper foil. In the closed state, the shielding member 7 is positioned to surround the electric wire 90 at position P and the members of the measuring means 5 that are arranged along the electric wire 90.

[0078] More specifically, in this embodiment, the shielding member 7 is arranged so as to encircle the voltage sensor unit 50 in a side view. For example, the shielding member 7 is positioned between the cable contact portion 60 and the biasing member 69 and the inner surface of the first housing 10. Also, the shielding member 7 is positioned between the detection unit 51 and the inner surface of the second housing 20. These upper and lower shielding members 7 are electrically connected at the rear, near the hinge portion 3. In the closed state, the voltage sensor unit 50 and the electric wire 90 are surrounded by the conductive shielding member 7, which prevents the electric field around the electric wire 90 from being affected by the surrounding conditions, allowing the detection unit 51 to appropriately measure the voltage of the electric wire 90.

[0079] Next, an overview of the method for attaching such a sensor unit 1 to the electric wire 90 will be described. As shown below, the sensor unit 1 can be installed on the electric wire 90 using an uninterrupted indirect live-line method while the electric wire 90 remains live.

[0080] Figure 5 illustrates the procedure for attaching the sensor unit 1 to the electric wire 90.

[0081] In the diagram, a left side view showing the state of the sensor unit 1 when it is attached to the electric wire 90 is shown in stages.

[0082] In this embodiment, the tool mounting section 18 is configured to allow attachment and detachment of a part of an indirect live-line tool 95, such as a hot stick. The indirect live-line tool 95 is configured, for example, to allow attachment and detachment of a tip tool depending on the work to be performed at its tip. That is, for example, the tip of the indirect live-line tool 95 is provided with a detachable attachment section 952 to which a tip tool can be attached and detached.

[0083] In this embodiment, the tool mounting portion 18 has a cylindrical shape into which the attachment / detachment portion 952 of the indirect live-line tool 95 can be inserted. That is, the attachment / detachment portion 952 has a rod-shaped or protruding portion that can be inserted into the cylindrical portion of the tool mounting portion 18. With this configuration, the sensor unit 1 can be reliably supported by the indirect live-line tool 95 when the attachment / detachment portion 952 is inserted into the tool mounting portion 18. Alternatively, the tool mounting portion 18 may have a rod-shaped or protruding portion, and the attachment / detachment portion 952 may have a cylindrical shape into which such portion can be inserted.

[0084] In this embodiment, the tool mounting portion 18 is configured to correspond to a twist-lock type attachment / detachment portion 952. A twist-lock type means, for example, that the attachment / detachment portion 952 can be attached to the attachment / detachment portion 952 by rotating the attachment / detachment portion 952 around its axis while the attachment / detachment portion 952 is pressed into the attachment / detachment portion 952. That is, the tool mounting portion 18 is configured such that the indirect live-line tool 95 can be attached to or detached by rotating the indirect live-line tool 95 axially relative to the tool mounting portion 18, with one of the tool mounting portion 18 and the indirect live-line tool 95 fitted into the other in the axial direction.

[0085] More specifically, for example, the detachable portion 952 is a cylindrical part that protrudes toward the tip of the indirect live-line tool 95, and engaging projections 953 that protrude radially outward are formed at multiple locations (for example, two locations) on its outer circumferential surface. The tip of the detachable portion 952 is partially displaceable toward the base of the indirect live-line tool 95, and the distance between the tip of the detachable portion 952 and the engaging projections 953 can change. By providing means such as a spring inside, in a natural state where no force is applied to the detachable portion 952, the distance between the tip of the detachable portion 952 and the engaging projections 953 is maintained at a relatively long state. The tool mounting portion 18 has a guide groove 181 into which the engaging projections 953 of the detachable portion 952 can engage. The guide groove 181 is configured to guide the engaging projection 953 while it is held within the groove, from the moment the detachable portion 952 is pushed into the inside of the tool mounting portion 18 and rotated around its axis, until the pushed-in state is released. In other words, by pushing the indirect live-line tool 95 into the sensor unit 1 and rotating it around its axis in accordance with the guidance of the engaging projection 953 in the guide groove 181, the indirect live-line tool 95 can be easily attached to the sensor unit 1.

[0086] Furthermore, an indirect live-line tool 95 may be used as the tip tool, which has a component attached to the tool mounting section 18 that can be attached to it. The attachment / detachment structure between the tool mounting section 18 and the indirect live-line tool 95 is not limited to a twist-lock type, but may be of other structures or methods.

[0087] In this embodiment, the sensor unit 1 is configured to change from an open state to a closed state, for example, when the indirect live-line tool 95 is attached to the tool mounting portion 18. That is, with the sensor unit 1 attached to the indirect live-line tool 95, the operation of placing the sensor unit 1 on the electric wire 90 can be performed. An example of the workflow will be described below.

[0088] (Step S31) That is, as shown in the figure, the indirect live-line tool 95 is attached to the sensor unit 1, which is in the open state. The indirect live-line tool 95 is fixed to the sensor unit 1 by inserting the attachment / detachment part 952 into the tool attachment part 18 and rotating the tool attachment part 18 in the axial direction, as described above. This makes it possible for the worker to lift the sensor unit 1 upwards via the indirect live-line tool 95.

[0089] (Step S32) Next, the worker uses the indirect live-line tool 95 to lift the sensor unit 1 to near the electric wire 90 to be installed, and moves the sensor unit 1 from under the electric wire 90 to the back (left in Figure 5). Then, as shown by the dashed line in the figure, the sensor unit 1 is placed on the electric wire 90 so that the electric wire 90 is positioned in the housing 14 of the open sensor unit 1.

[0090] (Step S33) Next, the worker uses another tool to rotate the second housing 20 relative to the first housing 10 to close the housing 2. That is, the worker pushes the second housing 20 toward the first housing 10 while maintaining the position of the first housing 10 so that it remains suspended over the electric wire 90. In this case, the tool can be, for example, another indirect live-line tool 95, but is not limited to this. For example, a rod-shaped tool or other tools may be used. The tool can, for example, utilize a recess 203 formed on the surface of the front part of the second housing 20. With the recess 203 provided in this way, the tool can easily and reliably close the housing 2 without slipping on the surface of the second housing 20.

[0091] When housing 2 is closed, the snap-fit ​​242 engages with the first housing 10, so housing 2 remains closed without the need to support the second housing 20 with a tool. In this embodiment, with the snap-fit ​​242 engaged with the first housing 10, the fastening member 88 is tightened from the bottom of housing 2. This securely holds housing 2 in the closed position.

[0092] (Step S34) When the housing 2 is closed and the sensor unit 1 is positioned on the electric wire 90, the indirect live-line tool 95 attached to the tool mounting part 18 is removed from the tool mounting part 18. This places the sensor unit 1 on the electric wire 90.

[0093] To remove sensor unit 1, simply follow the reverse procedure of the installation process described above.

[0094] As described above, according to this embodiment, the upper first housing 10 of the sensor unit 1 is provided with a housing section 14 that can be placed over the electric wire 90 and a tool mounting section 18 to which an indirect live-line tool 95 can be attached. With the indirect live-line tool 95 attached to the tool mounting section 18, the housing 2 can be changed from an open state to a closed state, so the sensor unit 1 can be easily installed on or removed from the electric wire 90 in an indirect live-line work method that is performed without power interruption. A worker positioned below the electric wire 90 can perform the work of placing the sensor unit 1 on the electric wire 90 by aligning the position of the sensor unit 1 so that the electric wire 90 is positioned in the housing section 14. The tool mounting section 18 is provided on the left side so as not to obstruct attention when viewed from below during work. The position of the electric wire 90, the overall position of the sensor unit 1, and the position of the housing section 14 can be easily confirmed when viewed from below, so the installation work of the sensor unit 1 can be easily performed.

[0095] The position on the tool mounting section 18 where the indirect live-line tool 95 can be attached is between the hinge section 3 and the housing section 14 in the front-to-back direction. Therefore, with the sensor unit 1 above the worker, the worker can easily move the sensor unit 1 while visually confirming that the electric wire 90 is housed in the housing section 14. In addition, in the open state, the rotational moment of the sensor unit 1 around the left-to-right axis passing through the tool mounting section 18 is reduced. Therefore, the worker can easily maintain the sensor unit 1 in the open state, supported overhead by the indirect live-line tool 95.

[0096] In this embodiment, the detection unit 51 for measurement is located in the lower second housing 20, ensuring stability of the sensor unit 1's posture during installation and while it is installed. The upper and lower housings 2 are configured to be held temporarily in a closed state with a snap fit, making it easy to fix the sensor unit 1 in place when necessary.

[0097] (others)

[0098] The present invention is not limited to the embodiments described above, and various modifications are possible, which are also included within the scope of the present invention.

[0099] Some of the components or functions in the above-described embodiments may be omitted. Other components may also be added.

[0100] For example, the sensor unit is not limited to use only with indirect live-line tools. Furthermore, the installation of the sensor unit is not limited to being performed using an uninterrupted power supply method. It is also possible for workers to directly lift and attach such a sensor unit to the power line.

[0101] Furthermore, the shielding member does not necessarily have to be housed inside the enclosure. Also, if, for example, the sensor unit does not have a voltage sensor section, the shielding member does not need to be provided. [Industrial applicability]

[0102] As described above, the sensor unit according to the present invention has the effect of providing a sensor unit that can be easily installed on electric wires, and is useful as a sensor unit, etc. [Explanation of symbols]

[0103] 1 Sensor unit, 2 Housing, 3 Hinge section, 5 Measuring means, 7 Shielding member, 10 First housing, 11 First hinge section, 14 Housing section, 18 Tool mounting section, 20 Second housing, 21 Second hinge section, 24 Engaging means, 40 Current sensor section, 45 Rogowski coil, 50 Voltage sensor section, 51 Detection section, 60 Cable contact section, 90 Electric wire, 95 Indirect live-line tool, 242 Snap-fit, P Placement position

Claims

1. A housing having an upper first housing and a lower second housing that are rotatable relative to each other via a hinge, configured to be able to move from an open state where the gap between the first housing and the second housing is open to a closed state where the gap between the first housing and the second housing is closed so that electric wires are positioned at the location between the first housing and the second housing, A measuring means housed inside the aforementioned enclosure, which measures the energized state of the electric wires located at the aforementioned position when the enclosure is closed, The first housing is provided with a housing portion which is a recess configured to accommodate electric wires arranged at the aforementioned position, The first housing is provided with a tool mounting section configured to allow the attachment and detachment of an indirect live-line tool, The housing is configured to be able to be moved from the open state to the closed state while the indirect live-line tool is attached to the tool mounting portion, and is a sensor unit.

2. The sensor unit according to claim 1, wherein, in the front-to-back direction which is the horizontal direction among the directions perpendicular to the electric wire at the aforementioned arrangement position, the position in which the indirect live-line tool can be attached to the tool attachment portion is between the hinge portion and the housing portion.

3. The sensor unit according to claim 1 or 2, wherein the difference between the angle of the second housing relative to the first housing in the open state and the angle of the second housing relative to the first housing in the closed state is 90 degrees or less.

4. The sensor unit according to claim 1 or 2, wherein the housing has engaging means configured such that the first housing and the second housing engage by snap-fit ​​when the housing is closed.

5. The measuring means has a detection unit positioned along the electric wire at the arrangement position in the closed state, The sensor unit according to claim 1 or 2, wherein the detection unit is attached to the second housing.

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