JPS6350762A - Insulator for detecting voltage - Google Patents

Abstract

PURPOSE:To obtain an insulator for voltage detection capable of measuring voltage safely with high accuracy, by applying induced voltage corresponding to line voltage to a voltage sensor and transmitting light power supplied as modulated light having a level coinciding with a voltage level. CONSTITUTION:A voltage detection part 4 holding an electric wire 5 is provided to an insulator main body having a light pervious body 21 inserted therethrough and a voltage sensor 14 equipped with the electrooptical element 16 connected to the light pervious body 21 is arranged. The first electrode 6 opposed to an electric wire 5 and the second electrode 7 opposed to the electrode 6 are arranged at a predetermined insulating interval and the electrodes 6, 7 are connected through the sensor 14. The light power transmitted from a light source enters the sensor 14 through the light pervious body 21. Said light power receives the phase modulation corresponding to the secondary voltage of an electric line by the element 16 during the passage through the sensor and is modulated in its intensity by a polarizer 20 and a 1/4 wavelength plate 17 to become a light intensity signal and the modulated light is reversed from a reflecting mirror 18 to be transmitted through the light pervious body 21 and guided to the light receiver of a measuring device and converted to an electric signal to measure the voltage value of the electric line.

Description

DETAILED DESCRIPTION OF THE INVENTION Object of the Invention (Field of Industrial Application) This invention relates to a voltage detection insulator used for measuring voltage in an electric line.

(Prior Art) Conventionally, in electric lines, an electric field sensor 41 is placed close to the electric wire 5 as one of the information for power supply, as shown in FIGS. 4(a) and 4(b). An electric field (indicated by a chain line) is detected by this electric field sensor 41, and a voltage value is measured using a measuring instrument.

(Problems to be Solved by the Invention) However, in an overhead three-phase electric line, etc., the arrangement of line equipment is complicated, and the electric field is likely to fluctuate due to rain, etc., so the measurement opening degree decreases and the electric field sensor 41 also Due to the limitations of its detection ability, it has the disadvantage that it can only detect voltages in a limited range, making it inconvenient to apply to a wide range of voltages, including accident voltages. There were problems such as the need to prepare various sensors.

Structure of the Invention (Means for Solving the Problems) In order to solve the above-mentioned problems, the present invention provides a voltage detecting section for holding an electric wire in an insulator body through which a transparent body is inserted, and the voltage detecting section has the above-mentioned voltage detecting section. A voltage sensor including an electro-optical element connected to the transparent body is disposed, and a first electrode facing the electric wire;
A second electrode facing the first electrode is arranged with a predetermined insulating interval therebetween, and further, means is adopted for connecting the first electrode and the second electrode via the voltage sensor. ing.

(Function) By adopting the above-mentioned means, the present invention detects the electric field around the electric wire as a potential difference between the electric wires, the first electrode, and the second electrode, which are arranged with an insulating interval, thereby detecting the electro-optical element. An induced voltage corresponding to the voltage level of the line is applied to the provided voltage sensor, and the supplied optical power is transmitted as modulated light matching the voltage level through a transparent body inserted into the hook body.

(Example) Hereinafter, examples embodying this invention are shown in FIGS. 1 and 2.
This will be explained based on FIGS. 3(a) and 3(b).

A base metal fitting 2 is fitted and fixed to the lower end of the insulator body 1 made of porcelain, and a cap metal fitting 3 is fitted and fixed to the upper end. A recess 3a is provided in the upper part of the cap fitting 3, and the recess 3a has a voltage detecting part 4 having a groove 4a on the upper surface.
is accommodated.

In the voltage detecting section 4, the electric wire frame has an electric wire 5 supported in the groove 4a.
arc-shaped first electrodes facing each other with a predetermined insulation interval in parallel with the
An electrode 6 is disposed, and a second electrode 7, which is also arcuate and opposite to the first electrode 6, is disposed parallel to the outside of the first electrode 6 with a predetermined insulating interval therebetween. has been done. The first electrode 6 and the second electrode 7 each have a lead wire 8 at one end,
9 is connected.

The voltage detecting section 4 has the first electrode 6, the second electrode 17, and the lead wires 8, 9 embedded in an insulating material 1o such as rubber or resin, as shown in FIGS. 3(a) and (b). It is integrally molded and accommodated in the recess 3a of the cap fitting 3. Reference numeral 10a denotes a cutout portion that accommodates a voltage sensor 14, which will be described later, and the wire rib is formed simultaneously with the groove 4a during molding.

On the other hand, a base end portion of a voltage sensor 14 having an electro-optical element 16 is bonded and fixed to the upper end of a transparent body 21 such as an optical fiber or a perforated alumina rod inserted into the insulator body 1. The first electrode 6 and the second electrode 7 are arranged below the electrode 6, the second electrode 7, etc., and the first electrode 6 and the second electrode 7 are connected to each other via a voltage sensor 14 connected by the lead wire 8.9, respectively. ing.

The voltage sensor 14 is mounted in an insulating case 15 as shown in FIG.
An electro-optical element 16 such as a Pockels element is arranged inside,
A 1/4 wavelength plate 17 and a reflecting mirror 18 are integrally attached to the upper surface, and a rod lens 19 and a polarizing plate 20 are integrally fixed to the lower surface, and a transparent body 21 is bonded and fixed to the polarizing plate 20. At the same time, it is enclosed in an insulating case 15 with an insulator 25. 23 and 24 are fixing materials, respectively.

Note that electrodes 22a and 22b are provided on both sides of the electro-optical element 16, and the lead wires 8.9 are connected to the electrodes 22a and 22b, respectively.
a and 22b may be led out of the insulating case 15 with lead wires, or an auxiliary electrode or the like may be provided on the side surface of the insulating case 15. Further, the voltage sensor 14 includes an insulating case 15 and an insulator 25.
It is also possible to directly encapsulate the voltage detection unit 4 in an insulating manner without using the voltage detection unit 4 or the like.

The voltage detecting section 4 is formed by embedding the first electrode 6, the second electrode 7, and the lead wires 8, 9 and forming the lead wire 8.
.

Reference numeral 11 denotes a holding lid made of an insulating material, and the electric wire frame of the voltage detecting section 4 has a groove 4af, into which the electric wire 5 is inserted.
The electric wire 5 is gripped by being tightened and fixed to the cap fitting 3 via an insulating cushioning material 12 such as rubber.

An optical connector 26 bonded and fixed to a transparent body 21 is attached to the base metal fitting 3 at the lower end of the insulator body 1, and the voltage detection insulator is connected to an optical transmission line using an optical fiber cable 27 at the location where the electric line is installed. Optical spectrometer 2 of measuring device 32
8, for example, a light source 29 from a light emitting diode and a light receiver 30 from a photodiode to the arithmetic and control unit 3.
It is configured so that it can be connected to 1 etc.

Next, the operation of the voltage detection insulator constructed as described above will be explained.

The voltage detecting part 4 of the voltage detection insulator that grips the electric wire 5 in the electric line is located within the electric field of the electric wire 5, and the first electrode 6 disposed opposite to the electric wire 5 has a voltage detection part 4 that holds the electric wire 5. A secondary voltage is induced, and a secondary voltage corresponding to the induced voltage of the first electrode 6 is also induced in the second electrode 7 arranged opposite to the first electrode 6 according to the mutual capacitance. A potential difference is induced between the first electrode 6 and the second electrode 7, and one electrode 22 of the voltage sensor 14 is generated by the lead wire 8 connected to the first electrode 6.
A and the other electrode 22b of the voltage sensor 14 are generated by the lead wire 9 connected to the second electrode 7, and a potential difference is generated between the two electrodes, and a voltage is applied to the electro-optical element 16.

On the other hand, when optical power is transmitted from the light source 29 described above to the voltage detection insulator of the present invention via the optical fiber 27, this optical power is transmitted to the voltage sensor 14 through the optical connector 26 and the transparent body 21 inserted into the insulator body 1. The optical power is transmitted to the light receiving section 30 by the reflecting plate 18, but the optical power is transmitted to the voltage sensor 1.
4, due to the Pockels effect of the electro-optical element 16, the polarizer 20 receives phase modulation commensurate with the voltage applied to the voltage sensor 14, that is, the secondary voltage of the electric line.
The intensity is modulated by the quarter-wave plate 17 to become a light intensity signal, which is reversed by the reflecting mirror 18 and this modulated light is transmitted from the voltage detection insulator via the transparent body 21 and the optical connector 26. Measuring device 32 from optical fiber cable 27
The light is guided to a light receiver 3o, and then converted into an electric signal to measure the voltage value of the electric line.

In the present invention, as described above, the voltage detecting section 4 is integrally provided with the insulator and also serves as a gripping section for the electric wire, and the first electrode 6 and the second electrode 7 for detecting the electric field are placed close to the electric wire 5. In addition, a predetermined insulating interval is provided between the two electrodes to generate an induced voltage due to electrostatic induction in a regulated manner, and voltage is applied to the voltage sensor 14 by the potential difference between both electrodes. Highly accurate measurements can be made without being affected by electric field fluctuations due to equipment configuration or rainfall.

Further, as described in the embodiment, the voltage detection unit 4, which includes the first electrode 6, the second electrode 7, the voltage sensor 14, etc., is enclosed in an insulating material, and the voltage detection unit 4 is provided with a cap. By housing it in the metal fitting 3, external influences can be excluded and the detection function can be stably maintained.

Furthermore, in the present invention, as described above, the electric wire 5, the first electrode 6
Since the second electrode 7 is arranged with a predetermined distance between them, it is possible to induce any potential difference between the two electrodes in a restricted manner by appropriately adjusting the distance. The sensor 14 is not limited to a specific applied voltage, and the same type can be used for general purposes.

Furthermore, the shape of the electrodes is not particularly limited to the arc shape as in the embodiments; for example, flat plate electrodes may be arranged in parallel, and one electrode may be configured to be movable so that it can be installed easily. It can also be adjusted arbitrarily on site.

Furthermore, the voltage detection insulator of the present invention can be installed not only on existing electric lines, but also as a wire support insulator for electric lines, if installed at a suitable location from our office, it can be used at any time by connecting a measuring device. Voltage measurement can be easily performed.

That is, the present invention simplifies the structure by integrally providing a voltage detecting section on the head of the insulator body, which also serves as a wire gripping section, and also provides a configuration that can effectively utilize the non-inductive nature of the optical fiber. provide.

Effects of the Invention As detailed above, the voltage detection insulator of the present invention has a simple structure, is easy to handle, is safe, requires a small installation space, and is capable of high-precision voltage measurement without being affected by external influences. This is an excellent effect that can be implemented.

[Brief explanation of the drawing]

Fig. 1 is a sectional view of the main part showing an embodiment of the present invention, Fig. 2 is a half-longitudinal sectional view of the central part showing the entire voltage detection insulator, and Fig. 3
a) is a plan view showing the electrode arrangement of the voltage detection section, and Fig. 3(b)
) is a front view showing the arrangement of electric supplies in the voltage detection section, and Figure 4 (a)
) and (b) are external views showing a conventional voltage detection device. 1... Insulator body, 4... Voltage detection section, 5... Electric wire, 6
...First electric power (ship), 7.. Second electrode, 14.. Voltage sensor, 16.. Electro-optical element, 21.. Transparent body. Patent applicant Chubu Electric Power Co., Ltd. Nippon Insulator Co., Ltd. Company Takamatsu Electric Manufacturing Co., Ltd. Representative Patent Attorney On 1) Hironobu Figure 1

Claims (1)

[Claims] 1. An electric wire (
An electro-optical element (16) connected to the transparent body (21) is provided in the electro-optical element (4) for grasping the electro-optical element (16).
), and a first electrode (6) facing the electric wire (5) and a second electrode (7) facing the first electrode (6) are connected to each other. The first electrode (6) is arranged with a predetermined insulating interval therebetween;
A voltage detection insulator, characterized in that it is connected to a second electrode (7) via the voltage sensor (14). 2. The voltage detection insulator according to claim 1, wherein the electro-optical element (16) is a Pockels element.