JPH0752200B2 - Distribution line monitoring device - Google Patents

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a distribution line monitoring device installed to monitor an operating condition of a high voltage distribution line or a transmission line.

In today's society, momentary power outages are not allowed,
It is necessary to grasp the status of constant power transmission or distribution to prevent accidents. In order to prevent such an accident, the sensor of the present invention is installed in each of the three-phase electric lines.
When using it as a zero-phase sensor, install a current-voltage sensor on each set of three-phase lines and check the balance of the three phases.

2. Description of the Related Art Conventionally, a zero-phase sensor used for an overhead power distribution line is a zero-phase current transformer (hereinafter referred to as ZC) built in a relay switch installed on a utility pole.
The signal output from ZCT that occurs when an imbalance of current or voltage of the three-phase electric line occurs by inserting the three-phase electric line into the central through hole of the ring-shaped core called (T) Was. However, with this method, the electrical line to which a high voltage is applied is put together in the ZCT part in the relay switch, so insulation becomes extremely difficult. In addition, high voltage is always close in ZCT, and it cannot withstand long-term reliability. As described above, the occurrence of an accident has been relatively large in the past, and it was necessary to regularly replace the electrical line of the relay switch to prevent it.

Fig. 6 shows the installation status of a conventional relay switch on a utility pole. Three three-phase electric lines 2 (2a, 2b) are installed on the electric pole 1. The electric line 2 is fixed to and pulled by the armor 4 on the electric pole by the tension insulators 3 provided at regular intervals on the electric pole 1. In FIG. 6, the insulator 3 is used, the electric line is cut and the electric line 2a, 2b is pulled by a winch (not shown) or the like to make a slack distribution line, and the relay is connected between the electric lines 2a, 2b. A device such as the switch 5 is installed. That is, the sixth
The figure shows the relay switch 5 installed between the electric lines and one of the three-phase electric lines.
Reference numeral 2a is a structure that is connected to the other three-phase electric line 2b through the insulator 3 and the relay switch 5, and inside the relay switch 5 shown in FIG. A switch (both not shown) is built in, and ZCT detects an abnormality in the middle of the electric line and turns off the switch.

Problems to be Solved by the Invention As shown in FIG. 6, the three electric lines are concentrated at the relay switch 5. Inside the relay switch 5, the three electric lines will be closer and gather inside the ZCT. For this reason, the phase voltage of the three electric lines is applied to a very narrow place, and the insulation cannot be maintained depending on the deterioration due to long-term use or the airtight state of the relay switch, resulting in short circuit between lines or It could lead to a power failure due to a short circuit between the track and ZCT. In order to solve such a problem, the present invention is to install a distribution line monitoring device in a state where each electric line of a three-phase electric line is installed at a constant interval and obtain information about each electric line. Is. It is desirable that this information be capable of simultaneously monitoring the current or voltage flowing in the electric line at all times without operating the electric line. Furthermore, the monitoring device causes an error even when installed for a long time. It is better that the tolerance for installation variation on the phase line is large.

Means for Solving the Problems The distribution line monitoring device of the present invention is made in view of the problems as described above, and a storage box body for storing an optical voltage sensor or a current sensor therein, and the storage box body. A lid body having a box body mounted therein, the housing lid body having an electric line installation portion installed therein and a fixing frame body having an electric line arrangement portion facing the electric line installation portion. The electric line is installed between the installation portion and the arrangement portion, and the lid body and the fixing frame body are fixed to each other.

Operation According to the present invention, after the box body is attached to and integrated with the lid body, the fixing frame body is temporarily fixed to the electric line and fixed, and the fixing frame body and the lid body are fixed, thereby facilitating the operation. The monitoring device can be attached to the power line. Further, it is also possible to incorporate a capacitor voltage divider in the lid and the fixing box to apply a voltage to the sensor.

That is, the present invention is an optical sensor, which can maintain high insulation, enable signal detection from an optical fiber to detect abnormalities at remote locations, and control the device. Every time, the frame is housed in the lid, and the electric line is installed between the lid and the fixing frame, so the monitoring device can be easily installed on the electric line while the electric line is in a live state. Can be installed.

Then, the fixing frame can be temporarily fixed to the electric line, and then the lid can be fixed by screwing or the like, so that the work can be attached to the electric line with good workability. Further, the sensor has an excellent sealing effect, and since the electric line installation portion and the arrangement portion, which are formed of, for example, grooves, are formed in the lid body and the frame body, positioning and the like can be easily performed.

Further, since the structure in which the sensor is first housed in the box body and then the lid body and the box body are fixed to each other, the structure of the box body and the lid body can be simplified. In addition, if the lid and the frame are structured such that the condenser voltage divider and a part of the core are integrated inside, a good airtight state can be obtained between the box and the lid. In this way, one end of the frame is movably fixed, for example, with a screw to the lid part in which the box body is housed, and the electric wire is provided between the frame and the round groove of the lid that match the electric line shape. It is possible to insert the passage and temporarily fix them, and then adjust the position and fix them.

Example First, the principle of an example of the optical current sensor and voltage sensor used in the present invention will be briefly described. First, the optical current sensor uses the Faraday effect and detects a magnetic field generated around the electric line by a magneto-optical element when a current flows in the electric line. Concretely explaining the optical current sensor with reference to FIG. 4, random light such as LED 101 of the light source is shown.
The light 102 is passed through a polarizing plate 103 to form a linearly polarized light 104, which is incident on a magneto-optical crystal 105 having a crystal having a length L. When a magnetic field H106 is applied in the same direction as the light advancing direction, the plane of polarization of the emitted light 107 rotates by an angle θ108. The magnitude of the rotation angle of θ108 can be extracted as the light intensity by the analyzer 109 installed on the output side. When the transmission polarization directions of the polarizer 103 and the analyzer 109 are shifted by 45 °, the light output intensity is expressed by the following equation.

Pαsin (2θ) to 2θ = 2VLH (θ << 1) V: Verdet constant, L: material length When θ << 1, the optical output P is proportional to the magnetic field H106. With such a configuration, when a current flows through a conductor, for example, an electric line, the magnitude of the current flowing can be measured by measuring the magnetic field 106 generated around the conductor.

The optical voltage sensor uses the Pockels effect and senses the amount of change in the birefringence of the crystal with respect to the electric field when light passes through the Pockels element, and detects the electric field. Specifically, referring to FIG. 5, the optical voltage sensor will be described. Random light from a light source (not shown)
1 through the polarizing plate 302 to the linearly polarized light 303, then 1/4 of the light source wavelength
The circularly polarized light 305 is passed through the wave plate 304 of. The circularly polarized light 305 is passed through the Pockels element 306 and received by the analyzer 307. At this time, a conductor (for example, between the electric line and the ground) voltage 308 is applied to the Pockels element 306, and the circularly polarized light 305 becomes a vertically long elliptically polarized light 309 or a horizontally long elliptically polarized light 310 depending on the directionality and the strength of the voltage application. Or This change is received by the 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 distribution line monitoring apparatus according to an embodiment of the present invention. FIG. 1 is a sectional view of the device of the present invention attached to one electric line at a position where the electric line is cut longitudinally, and includes a sensor, a sensor housing frame, a lid, a fixing frame, a capacitor voltage divider, and a core. , Only the positional relationship of electric lines is clarified.

The configuration of the sensor unit of the present embodiment includes an optical current sensor 12 having a circular integration core 201 for concentrating a magnetic field generated around the electric line 11, and a voltage between the electric line 11 and the ground as a capacitor. It comprises an optical voltage sensor 13 to which a divided voltage is applied from a voltage divider 202 for voltage application. A fixing frame body 16 which houses the voltage divider 202 and the circular integration core 201 above the electric line 11, and a lid body which houses the voltage divider 204 and the circular integration core 201 below the optical system current sensor and the optical system voltage. The storage box body 14 houses the sensor and is attached to the lid body, and these are combined to form one distribution line monitoring device. In the storage box body 14 in which the current sensor and the voltage sensor are stored, the frame body and the lid body are provided with an installation portion such as a circular groove for installing an electric line. Since the inside is hollow, airtight assembly with the outside is performed during assembly. Of course, the inside may have a structure of being filled with a rubber-like resin or the like.
In addition, from the voltage divider 202 to the optical voltage sensor 113, a thin line 203
Is wired by. Optical fiber cords 20 are connected from the above sensors to external light emitting and receiving elements (not shown). Although FIG. 1 shows a configuration in which one device is attached to one electric line, in reality, many distribution lines have three phases, and the distribution lines are similarly installed on three electric lines. Of course, it may be attached to only one electric line. The optical wire sensor 12 housed inside for installation of the distribution line monitoring device on the electric line has the core of the core for circular integration at the position.
Installed in the gap of 201, the installation variation causes an error in the performance of the monitoring device. Further, the optical voltage sensor takes out the voltage by dividing the voltage of the capacitor as described above,
The voltage changes depending on the capacitor structure and shape. For this reason, it is necessary to securely hold and fix it and to prevent water from entering from the outside.

Next, a concrete example is shown in FIG. FIG. 2 shows a distribution line monitoring device installed on one electric line.

The distribution line monitoring device is installed in each electric line (three lines) and has a signal processing unit in order to monitor the variation of the three-phase electric line. The monitoring devices installed on the three-phase electric lines have the same shape, and those installed on one electric line are shown in FIGS. 2 and 3. In addition, the distribution line monitoring apparatus may include an optical fiber cable and a circuit unit (not shown) connected to the optical fiber cable, in which the components described in the embodiments are assembled.

The device includes an optical current sensor and an optical voltage sensor 13,
It comprises a storage box body 14 for housing the sensor, a lid body 15 configured to cover the whole of the box body 14, a lid body 15 and a fixing frame body 16 for sandwiching and fixing an electric line from above and below. The details will be described with reference to FIG.

FIG. 2 is a perspective view of the sensor section of the distribution line monitoring apparatus of the present invention, and is a view taken at a portion where the central core is housed. As shown in a part of the cut-away view, the storage box 14 stores the optical voltage sensor 13 and the optical current sensor 12, and a lid 15 for mounting the storage box inside overlaps from above. As shown in the cut surface of the lid body 15 in FIG. 2, the divided portion of the core 201 for the optical current sensor exists in the lid body 15. Furthermore, a condenser voltage divider 202 is provided at the center of the lid 15.
Has been installed.

A concave portion 32 formed of a circular groove for fixing to the electric line is formed in the upper portion of the lid body 15 having such a configuration, and a circular groove concave portion 26 is formed in the lower portion of the fixing frame body 16 at the facing portion. The lid body 15 and the fixed frame body 16 are composed of the rotatable movable portion 23 of the lid body 15 and the convex portion of the fixed frame body 16.
It is stopped with 24 and fixed rotatably. Frame for fixing 16
As is apparent from FIG. 2 cut at the central core part, a part of the magnetic core 201 is formed inside, and a part of the capacitor voltage divider 202 is also incorporated. As described above, like the lid body 15, if the structure in which the capacitor voltage divider and a part of the core are integrated inside the frame body 16 is adopted, stable voltage application and stable magnetic flux concentration can be performed, so that reliable operation is ensured. A structure that does not change with respect to fixed and external environmental conditions is required.

FIG. 3 is an exploded view of the distribution line monitoring device. The optical current sensor 12 and the voltage sensor 13 are located in the box 14, that is, the current sensor 12 is a constricted portion where a magnetic field focusing core is installed. It is fixed to 17, and the voltage sensor 13 is installed on the side where the voltage application terminal 18 from the capacitor voltage divider is pulled out. An optical fiber 19 extends out from these sensors by a certain length, and is connected to an optical fiber cord 20 or the like 20 which is inserted and fixed to the sensor housing box 14 from the outside. At this time, the extra length of the optical fiber 19 is stored in the space inside the box body 14. The sensor is adhered and fixed in the storage box body 14 by an adhesive (not shown) or the like so that the position of the sensor does not move due to external vibration. Further, a groove (not shown) is formed on the lower side where the current sensor 13 is installed as a housing portion for the optical fiber 19 of the voltage sensor 13 inside the housing box 14 so as not to get in the way.

Also, the center of the box is a part that is constricted but the core for the current sensor 12 is installed as described above, and a recess (not shown) is formed at a certain position to prevent an error when installing the current sensor. It can be installed easily.

In this way, the lid 15 is placed on the storage box 14 in which the sensor is stored.
Will be stacked and stored. The lid body 15 has a concave portion below which the box body 14 can be housed and mounted, and means such as screws (not shown).
To fix both. The lid 15 is a convex part on both sides of the central part
Part of the current sensor core divided into 33 is stored. core
In 201, the air gap portion is located on the lower side and is cut horizontally at the central portion, and the semicircular portion is housed in the frame 16 and the other two portions are housed in the lid 15. That is, the lid 15 has a shape in which a part of two circles other than the semicircle is embedded on both sides. Further, the lower side of the capacitor voltage divider 202 is housed in the lid body 15, and the connection terminal 22 of the voltage divider 202 is surrounded by the O-ring 21 and protrudes. Further, at one end of the lid body 15, there is a rotatable movable portion 23 which is movable and fixed to the frame body 16, and is assembled with the convex portion 24 of the fixed frame body 16 by a screw 33. Further, a hook hook portion 25 for provisional fixing is formed which has a passage hole at a portion (the other end) facing the rotary movable portion 23 and which is engaged with the hook 31 of the frame.

Next, on the side surface of the lid body, a fixing portion 26 for fixing the fixing frame body 16 is provided.
Are formed at four positions, and screws 28 each having a thumbscrew 27 are attached thereto, and a circular groove 29 into which the electric line 11 is fitted is formed in the upper central portion of the lid body 15 in the longitudinal direction. Further, a rotatable movable hook portion 30 is formed at a portion facing the lid bodies 15 at both ends where the semicircular core is housed, and a temporary fixing hook 31 is formed at the opposite side. Further, a circular groove 32 for accommodating the electric line 11 is also formed in the central portion of the frame body 16.

To describe the mounting work, the box body in which the sensor-enclosed box body is mounted in the lid body 16 and is rotatably attached by the rotatable portion 23
Carry 16 and lid 15 into the electric line section, install electric line 11 in circular groove 29, stack frame 16 on lid 15, hook 31 and hook section
Temporarily fix at 25. At this time, the electric line 11 is also arranged in the groove 32 and housed in both grooves. After that, fixing screws 27, 28
Is locked and fixed to the fixing portion 34, and the lid 15 and the frame 16 are firmly fixed to the electric line 11.

In the above-described embodiments, the device in which two types of voltage and current are accommodated is described as the optical sensor, but either one may be used and the optical sensor of other principle may be used. Further, the capacitor voltage divider, the core, and the like are not essential, and the mounting positions of these can be arbitrarily selected depending on the configuration.

EFFECTS OF THE INVENTION The present invention is an optical current or voltage sensor, which can maintain high insulation, and further enables signal detection by a fiber optic cable to detect and control anomalies from a remote location. Since it does not require concentration of electric lines,
High reliability can be maintained. Further, by adopting the configuration of the present invention, the following effects can be obtained. That is, the sensor can be accurately stored and fixed in a specific position of the box body in advance, and by further incorporating the box body in the lid, it is possible to obtain a structure that is strong against vibration and has a high sensor sealing effect. Become. In addition, the lid and frame are temporarily fixed to the active electric line,
After that, the lid can be fixed to the frame with screws,
Further, since the installation portion and the arrangement portion of the electric line are formed, it is possible to easily and firmly fix the monitoring device to the electric line with good workability without any troublesome positioning.

As described above, according to the present invention, it is possible to easily attach the monitoring device having the optical sensor to the live electrical line without affecting the wiring system, and the distribution line monitoring device can be widely used. It contributes.

[Brief description of drawings]

FIG. 1 is a schematic cross-sectional view of a main part of a distribution line monitoring device according to an embodiment of the present invention, FIG. 2 is a perspective partial cross-sectional view of the device, and FIG. 3 is a distribution line monitoring device according to an embodiment of the present invention. FIG. 4 is a diagram showing the principle of the optical current sensor, FIG. 5 is a diagram showing the principle of the optical voltage sensor, and FIG. 6 is a built-in conventional zero-phase current transformer. It is the installation figure on the electric pole of the relay switch which was made. 11 …… Electric line, 12 …… Optical current sensor, 13 …… Optical voltage sensor, 14 …… Sensor housing box, 15 …… Box housing mounting lid, 16 …… Fixing to electric line Frame.

Front page continued (72) Inventor Osamu Kamata 1006 Kadoma, Kadoma City, Osaka Prefecture Matsushita Electric Industrial Co., Ltd. (72) Inventor Akihiro Miura 3-22 Nakanoshima, Kita-ku, Osaka, Osaka (56) References Japanese Unexamined Patent Publication No. Sho 62-132178 (JP, A) Actual exploitation Sho 63-19273 (JP, U)

Claims (4)

[Claims] 1. A storage box body for housing an optical voltage sensor or current sensor therein, a storage lid body inside which the storage box body is mounted and which has an electric line installation portion, and the electric line installation. Section and a fixing frame body having an electric line arrangement portion facing each other, and the electric line is installed between the installation portion and the arrangement portion of the lid body on which the box body is mounted, and the lid body and the fixing frame body. A distribution line monitoring device characterized by being fixed to the body. 2. A housing box for housing an optical voltage sensor or a current sensor and the lid body are integrated with each other, and then the fixing frame body is temporarily fixed to the electric line to fix the fixing frame body and the lid body. The distribution line monitoring device according to claim 1, wherein the device is fixed. 3. The distribution line according to claim 1, wherein a condenser voltage divider is built in the lid and the fixing frame, and a voltage is applied to an optical voltage sensor housed in the box. Monitoring device. 4. A magnetic core is embedded in the lid and the fixing frame,
The distribution line monitoring device according to claim 1, wherein magnetic field concentration is performed on the optical current sensor.