JPH01270679A - Monitoring apparatus of power distribution line - Google Patents

Abstract

PURPOSE:To enable the simultaneous monitoring of a current flowing constantly through an electric line or of a voltage without operating the electric line, by fixing a frame body for fixation to the electric line temporarily and by fixing a cover body and the frame body for fixation together. CONSTITUTION:An apparatus comprises an optical type current sensor 12, an optical type voltage sensor 13, a box body 14 for accommodating the sensors 12 and 13, a cover body 15 covering the whole of the box body 14, and a frame body 16 for fixation for holding an electric line from above and below for fixation together with the cover body 15. The frame body 16 for fixation is fixed temporarily to the electric line 11, the frame body 16 for fixation and the cover body 15 are fixed together, and thereby the apparatus can be fitted easily to the electric line 11. By this constitution, a current flowing through the electric line 11 or a voltage can be monitored simultaneously at all times without operating the electric line 11.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to a power distribution line monitoring device installed to monitor the operating status of high voltage power distribution lines or power transmission lines.

In modern society, instantaneous power outages cannot be tolerated.
It is necessary to constantly monitor the status of power transmission or distribution to prevent accidents. The sensor of the present invention is installed on each three-phase electric line in order to prevent such accidents.

When used as a zero-phase sensor, there are four
Install a current and voltage sensor to check the three-phase balance.

2. Description of the Related Art Conventionally, zero-phase sensors used in overhead power distribution lines are linked-type sensors called zero-phase 3/\-7 current transformers (hereinafter referred to as ZCT) built into relay switches installed on utility poles. The three-phase electric wires were inserted all together into the central through-hole of the core, and the signal output from the ZCT that occurred when an imbalance of current or voltage in the three-phase electric wires occurred was detected. However, with this method, the electric line to which high voltage is applied is
If 1 is attached to the CT part, insulation becomes extremely difficult. Furthermore, high voltage is always present in the ZCT, making it unsustainable for long-term reliability. As described above, in the past, relatively many accidents occurred in this area, and in order to prevent them, it was necessary to periodically replace the electrical line of the relay switch.

Figure 6 shows the installation status of a conventional utility pole relay switch. Three three-phase electric lines 2 (2a.

2b) is installed. The electric line 2 is fixed to a cross arm 4 on a telephone pole and is tensioned by tension insulators 3 provided at certain intervals along the line. In Fig. 6, the electrical wire is cut using a tension insulator 3, and the stained wire 2 is cut using a winch (not shown) or the like.
A and 2b are stretched to form a distribution line without slack, and a device such as a relay switch 5 is installed between the connections of the electric lines 2a and 2b. That is, FIG. 6 shows a structure in which a relay switch 5 is installed between the electric lines, and one three-phase electric line 2a is connected to the other three-phase electric line 2b via an insulator 3 and the relay switch 5. There is a built-in ZCT and electric line cutoff switch (both not shown) described in h11 inside the relay switch AG5 shown in Fig. 6, and the ZCT detects an abnormality in the middle of the electric line. And it is something that cuts Nui nochi.

Problems to be Solved by the Invention As shown in FIG. 6, Miki's electric lines are concentrated at the relay switch 5. Inside the relay switch 5, Miki's electric lines become closer and converge inside the ZCT. In this case, the phase voltage of the three wires will be applied in a very narrow space, and insulation may not be maintained due to deterioration due to long-term use or the airtightness of the relay switch. This could lead to a short circuit between the line or between the line and the ZCT, leading to a power outage. In order to solve this problem, the present invention installs a distribution line monitor link device while each three-phase electric line is installed at a distance of 5 cm between each room, and It is an attempt to obtain information. It is desirable for this information to be able to simultaneously monitor the current or voltage flowing through the power line at all times without having to operate the power line, and the monitoring device should also be able to avoid errors even when installed for a long period of time. It is better to have a large tolerance for installation variations on phase power lines.

Means for Solving the Problems The power distribution line monitoring device of the present invention has been made in view of the above-mentioned problems, and includes a storage box body that houses an optical voltage sensor or a current sensor therein, and the storage box body. The housing includes a storage lid body which is mounted inside and has an electric line installation part on the upper part, and a fixing frame body which has an electric line arrangement part facing the electric line installation part. The electric wire is installed between the installation part and the arrangement part of the lid body to which the box body is attached, and the lid body and the fixing frame are fixed.

According to the present invention, the box body is attached and integrated with the lid body.
By fixing the fixing frame and the lid, the monitor link device can be easily attached to the electric line. It is also possible to have a capacitor voltage divider built into the lid and the fixing box to apply voltage to the sensor.

In other words, the present invention uses an optical sensor, which can maintain high insulation, and enables abnormality detection and equipment control at a remote location by transmitting signals from optical fibers. The structure is such that the frame is housed and attached to the lid, and the electric line is installed between the lid and the fixing frame, so the monitoring device can be easily connected to the electric line while the electric line remains live. Can be installed.

Since the fixing frame can be temporarily fixed to the electric line and then the lid body can be fixed with screws or the like, installation work to the electric line can be easily carried out. Furthermore, the sensor has an excellent sealing effect, and since the electric wire installation part and arrangement part, which are made of grooves, are formed on the lid body and outside the frame, respectively, it is easy to determine the position 7, ＼-/゛, etc. can.

Further, since it is possible to adopt a structure in which the sensor is first housed in the box and then the lid and the box are fixed, the structures of the box and the lid can be simplified.

In addition, if the lid and frame have a structure in which the capacitor voltage divider and a part of the core are integrated inside, a good airtight condition can be obtained between the box and the lid. In this way, one end of the frame is movably fixed, for example, by a screw, to the lid portion in which the box is housed. Then, the electric wire can be inserted between the round grooves of the frame body and the lid body that match the shape of the electric wire, and temporarily fasten the two, and then the position can be adjusted and fixed.

Embodiment First, the principle of an example of the optical current sensor and voltage sensor used in the present invention will be briefly described. First, an optical current sensor utilizes the Faraday effect, and uses a magneto-optical element to detect the magnetic field generated around the wire when a current flows through the wire.

Specifically, the optical current sensor will be explained with reference to FIG. 4. Random light 102 from a light source such as an LED is passed through a polarizing plate 103 to become linearly polarized light 104, and a magneto-optic crystal 105 having a crystal length L is used. Inject it into the When a magnetic field H106 is applied in the same direction as the traveling direction of this light, the polarization plane of the emitted light 107 is propagated by an angle θ108. The magnitude of this rotation angle θ108 can be extracted as the intensity of the light by an analyzer 109 installed on the output side. When the transmitted polarization directions of the polarizer 103 and the analyzer 109 are shifted by 45 degrees, the light output intensity is expressed by the following equation.

pctsin(2θ)~2θ=2VLH(θ<<1)V
: Verdet constant, L: material length θ (at 10 o'clock, optical output P is proportional to magnetic field H106.

With this configuration, when a current flows through a conductor, such as an electric wire or path, the magnitude of the flowing current can be measured by measuring the magnetic field 106 generated around the conductor.

Optical voltage sensors utilize the Pockels effect and detect the electric field by sensing the amount by which the multiple crystal layers change in response to the electric field when light passes through the Pockels element. Specifically, the vane beam type voltage sensor will be explained with reference to FIG. It passes through a plate 304 and becomes circularly polarized light 305. Circularly polarized light 305 is passed through a Pockels element 306 and received by an analyzer 307. At this time, a voltage is applied 308 to the Pockels element 306 on a conductor (for example, between an electric line and the ground), and □9 horizontally elongated elliptically polarized light in which the circularly polarized light 305 becomes a vertically elongated elliptically polarized light 309 depending on the directionality and the strength of the voltage application. It may become 310. This change is received by an analyzer 307, and the change in light amount is converted into a change in voltage application.

Next, FIG. 1 shows a schematic configuration of a wire/monitoring device according to an embodiment of the present invention. Figure 1 is a cross-sectional view of the device of the present invention taken vertically across a single electric line with 9 wires attached, showing the sensor, sensor housing frame, lid, fixing frame, and capacitor. Pressure, core.

It only clarifies the positional relationship of the electric lines.

The configuration of the sensor section of this embodiment is as follows:
Circulation integral core 20 for concentrating the magnetic field generated in the area
1, and an optical voltage sensor 13 to which a divided voltage is applied from a voltage divider 202 which divides the voltage between the electric line 11 and the ground into capacitors. The fixing frame 16 housing the voltage divider 202 above the electric line 11 and the loop integration core 201 and the voltage divider 204 below
and a lid body that houses the orbital integration core 201, and a storage box body 14 that houses the optical current sensor and the optical voltage sensor and is attached to the lid body, each of which is combined to form one power distribution line monitoring device. This is the result. The storage box body 14 in which the current sensor and the voltage sensor are housed has a frame body and a lid body formed with installation portions such as round grooves for installing electric wires.

The inside is hollow and the outside is airtight during assembly. Of course, the inside may be filled with rubber-like resin or the like. Note that a thin wire 203 is used to connect the voltage divider 202 to the optical voltage sensor 13 . The optical fiber cord 20 is connected to the external light emitting light receiving element (
(not shown) are connected to 11 and \-7, respectively. Although FIG. 1 shows a configuration in which one device is attached to one electric line, in reality, most distribution lines are three-phase, and they are arranged in the same way on three electric lines. Of course, there may be cases in which it is attached only to one tree's electric line.

For installation of a distribution line monitoring device on a power line, the optical wire sensor 12 housed inside is installed at the gear knob of the core 201 of the circuit integration core, and installation variations can cause errors in the performance of the monitoring device. becomes. Further, as described above, the optical voltage sensor extracts the voltage by dividing the capacitor voltage, but the stain pressure varies depending on the structure and shape of the capacitor. This is a sure hold.

It must be fixed and must be protected from water and other contaminants from the outside.

Next, a convex embodiment is shown in FIG. Figure 2 shows a distribution line monitoring device installed on one power line.

The distribution line monitoring device is installed on each electric line (three lines) in order to monitor the balance of the three-phase electric line, and further includes a signal processing unit.

The monitoring devices installed on the Mikime electric line have the same shape as l-, and those installed on the - electric line are shown in FIGS. 2 and 3. The distribution line monitoring device may also include an optical fiber cable and a circuit section (not shown) connected to the optical fiber cable, in which each component described in the embodiment is assembled.

The device includes an optical current sensor and an optical voltage sensor 13.
, a storage box body 14 for storing the sensor, a lid body 16 that covers the entire box body 14, and a fixing frame body 16 for sandwiching and fixing the electric wire from above and below between the lid body 15 and the lid body 15. A more detailed explanation will be given with reference to FIG.

FIG. 2 is a perspective view of the sensor section of the distribution line monitoring device of the present invention, cut at a portion where the central core is housed. As shown in a part of the cutaway diagram, the storage box body 14 houses an optical voltage sensor 13 and an optical current sensor 12, and a lid body 1 into which the storage box body is attached from above.
5 are overlapping. As shown in the cross section of the lid 15 in FIG. Further, a part of a capacitor voltage divider 202 is installed in the center of the lid 15.

A four part 32 consisting of a round groove for fixing to the electric wire is formed in the upper part of the lid body 15 having such a structure, and a four round groove part 29 is formed in the lower part of the fixing frame 16 of the opposing part.

The lid 15 and the fixed frame 16 are fixed by the rotationally movable portion 23 of the lid 16 and the convex portion 24' of the fixed frame 16, and are rotatably fixed. As is clear from FIG. 2, which is cut at the center core of the fixing frame 16, a part of the magnetic core 201 is formed therein, and a part of the capacitor voltage divider 202 is also built therein. In this way, if a structure is adopted in which the capacitor voltage divider and part of the core are integrated inside the frame 16, as in the case of the lid 15, stable voltage application and stable concentration of magnetic flux can be achieved. A structure that is fixed and does not change with respect to external environmental conditions is required.

FIG. 3 is an exploded view of the distribution line monitoring device, and the position of the optical current sensor 12 and the voltage sensor 1314 is the position of the box 14, that is, the current sensor 12 is located at the constriction 17 where the magnetic field convergence core is installed. A certain length of optical fiber 19 protrudes from these sensors, and is connected to an optical fiber cord or the like 20 that is inserted and fixed into the sensor storage box body 14 from the outside.
The extra length is stored in the space inside the box body 14. The sensor is fixed within the storage box 14 with an adhesive (not shown) to prevent its position from becoming rounded due to external vibrations or the like. Furthermore, a voltage sensor 13 is provided inside the storage box body 14.
A groove (not shown) is formed on the lower side where the current sensor 13 is installed as a storage part for the optical fiber 19 so that it does not get in the way.

In addition, although the inner flame of the box is broken, as mentioned above, the part where the core for the current sensor 12 is installed is only finished, and four parts (not shown) etc. are installed to prevent errors when installing the current sensor. It can be easily installed in a fixed position.

15 A-7 The lid 15 is stacked and stored on the storage box 14 in which the sensor is stored in this way. The lid body 15 has a box body 14 below.
It has a recessed part in which the parts can be housed and mounted, and the two are fixed by screws or other means (not shown). The lid body 15 accommodates a portion of the current sensor core divided into the convex portions 33 on both sides of the central portion. The core 201 is cut horizontally at the center with the air gap section facing downward, and the semicircular section is stored in the frame 16 and the other two sections are stored in the lid 16. That is, the lid body 15 has a shape in which parts of two circles other than semicircles are embedded in both sides. Further, the lower side of a capacitor voltage divider 202 is housed in the lid body 16, and the connection terminal 22 of the voltage divider 202 is surrounded by an O-ring 21 and protrudes. Further, at one end of the lid 16 there is a rotatable movable part 23 which is movable and fixed to the frame 16, and is assembled with the convex part 24 of the fixed frame 16 by screws 33.

The portion (other end) still facing the rotationally movable portion 23 has a passage hole, and a hook hooking portion 26 for temporary fixation with which the seven hooks 31 of the frame engage is formed.

Next, on the side surface of the lid body, four fixing stops 26 for fixing to the fixed frame 16 are formed, and screws 28 each having a thumbscrew 27 are attached. A circular groove 29 into which the electric line 11 is fitted is formed in the direction. Rotatable hooks 30 are formed at the portions facing the lid body 15 at both ends where the semicircular core is still housed, and temporary fixing hooks 31 are formed at the opposing sides. Furthermore, there is also a round groove 32 in the center of the frame 16 for accommodating the electric line 11.
is formed.

To describe the installation work, attach the box body with the sensor stored to the lid body 16.
The frame body 16 and the lid body 15, which are mounted inside and rotatably attached by the rotatable part 23, are carried to the electric line section, the electric line 11 is installed in the round groove 29, and the frame body 16 is attached to the lid body 16. and temporarily fix it using the hook 31 and the hook part 25. At this time, the electric line 11 is also placed in the groove 32 and accommodated in both grooves. Thereafter, the fixing screws 2 and 28 are engaged with the fixing portion 34 and tightened to firmly fix the lid 15 and the frame 16 to the electric line 11.

In the above embodiments, voltage is used as the optical sensor.

17 H/ Although a device containing two types of current has been described, either one may be used, and a light sensor based on another principle may also be used. Further, the capacitor voltage divider, core, etc. are not essential, and their mounting positions can be arbitrarily selected depending on the configuration.

Effects of the Invention The present invention is an optical current or voltage sensor.
High insulation properties can be maintained, and abnormalities can be detected from a remote location by signal transmission using optical fiber cables.

In addition to being controllable, high reliability can be maintained because there is no need to concentrate electrical lines as in the past.

Further, by adopting the configuration of the present invention, the following effects can be obtained. In other words, the sensor can be stored and fixed in advance in a specific position on the box body with high precision, and by incorporating the box body into the lid body, it is possible to obtain a structure that is resistant to vibration and highly effective in sealing the sensor. Become. In addition, the lid and frame can be temporarily fixed to the active electric line, and then the lid can be fixed to the frame with screws, etc., and furthermore, the electric line installation part and arrangement part can be formed. Therefore, it becomes possible to firmly fix the monitoring device to the electric line with ease and workability, without having to worry about positioning.

As described above, according to the present invention, a monitoring device having an optical sensor can be easily installed on a live power line without any influence on the wiring system, which greatly contributes to the spread of distribution line monitoring devices. It is something that contributes.

[Brief explanation of the drawing]

Fig. 1 is a schematic sectional view showing the installation of the main parts of a distribution line monitoring device according to an embodiment of the present invention, Fig. 2 is a perspective partial sectional view of the same device, and Fig. 3 is a distribution line monitoring device according to an embodiment of the present invention. A detailed exploded perspective view of the device, Figure 4 shows the principle of an optical current sensor, Figure 5 shows the principle of an optical voltage sensor, and Figure 6 has a built-in conventional zero-phase current transformer. This is a diagram showing the installation of a relay switch on a utility pole. 11... Electric line, 12... Optical current sensor, 13... Optical voltage sensor, 14...
...Box for sensor storage, 15...Lid for box storage and attachment, 16...19 \-2 Frame for fixing to electric line. Name of agent: Patent attorney Toshio Nakao and one other person
sake

Claims (4)

[Claims] (1) A storage box body that houses an optical voltage sensor or a current sensor inside, a storage lid body in which the storage box body is installed and has an electric line installation part on the upper part, and the electric line installation part. A fixing frame body having opposing electric line arrangement parts,
A power distribution line monitoring device characterized in that the electric line is installed between the installation part and the arrangement part of the lid body to which the box body is attached, and the lid body and the fixing frame are fixed. (2) After integrating the storage box that houses the optical voltage sensor or current sensor and the lid, the fixing frame is temporarily fixed to the electric wire, and the fixing frame and the lid are fixed. A power distribution line monitoring device according to claim 1, characterized in that: (3) The distribution line monitoring device according to claim 1, characterized in that a capacitor voltage divider is built into the lid body and the fixing frame body, and voltage is applied to an optical voltage sensor housed in the box body. . (4) The distribution line monitoring device according to claim 1, characterized in that a magnetic core is embedded in the lid and the fixing frame to concentrate the magnetic field on the optical current sensor.