JPH11202000A - Light VT - Google Patents

Abstract

(57) [Problem] In a conventional optical VT, a voltage divider main body and a solid capacitor are separated, and the voltage divider main body must be sealed and filled with an insulating gas, and the volume of the entire device is large. ,
The configuration was extensive. The present invention provides a first voltage dividing capacitor including a high voltage electrode 2, an intermediate electrode 3, and a ceramic capacitor 4 to which a voltage to be measured is applied, and is electrically connected in series to the first voltage dividing capacitor. And the intermediate electrode 3 and the ground electrode 5
And a second voltage dividing capacitor comprising a ceramic capacitor 6 and an optical sensor unit 7 which is electrically connected in parallel to the second voltage dividing capacitor and converts the divided voltage into an optical signal.
Consists of And the first voltage dividing capacitor;
The second voltage dividing capacitor and the optical sensor unit 7 are integrally covered with an outdoor epoxy resin 9.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for measuring an induced voltage or a line voltage generated in a distribution line by installing the distribution line.
A voltage sensor that converts and outputs an optical signal, that is, an optical VT
(VoltageTransformer).

[0002]

2. Description of the Related Art As a conventional light VT (also referred to as light PT), there is a light VT described in, for example, JP-A-7-83961. That is, a voltage divider for dividing the voltage to be measured,
An optical sensor unit that applies an output voltage of the voltage divider to the electro-optic crystal and converts the voltage into a light intensity corresponding to the output voltage, and measures the magnitude of the voltage to be measured based on the light intensity. The voltage divider is connected to a charged part to which the voltage to be measured is applied, a single space electrode surrounding the charged part and a voltage divider main body as a gas capacitor made of an insulating gas, a space electrode and an optical sensor part. Composed of solid capacitors.

However, in the conventional optical VT, the voltage divider main body and the solid capacitor must be separated, and the voltage divider main body must be sealed and filled with an insulating gas. Met.

FIG. 2 is a configuration diagram showing a system (prior art) for measuring a steep pulse voltage such as an induced voltage at the time of a lightning strike. The measurement system includes a light VT 52 as a voltage detection unit that divides a voltage induced in the overhead ground wire phase conductor 51 and converts the voltage into an optical signal, and a measurement that converts the optical signal into an electric signal and performs processing such as recording. The optical VT 52 and the measurement processing unit 53 are connected by an optical fiber cable 54. The optical VT 52 includes a resistance voltage divider 55 that divides the voltage induced in the overhead ground wire phase conductor 51, and a high voltage probe 5 that applies the divided voltage to the E / O converter 57.
6 and an E / O for converting the divided voltage into an optical signal.
It includes a converter 57, and a high-capacity battery (not shown) for driving the high-voltage probe 56 and the E / O converter 57. Then, the optical signal is guided to the measurement processing unit 53 via the optical fiber cable 54. The measurement processing unit 53 includes an O / E for converting an optical signal into an electric signal.
A converter 58, a transient memory 59 for processing and storing the electrical signal, a data recorder 60,
A power supply device 62 including an insulating transformer 61 is provided.

As described above, in the conventional measuring system, the entire system is complicated and large. In particular, when installing the optical VT in the distribution line, there is a demand for a limited space for the mounting column, and to reduce the size of the optical VT in order to improve the handleability and facilitate the work on the column.

[0005] Therefore, the present invention is to provide a light VT which is small and easy to handle.

[0006]

In order to solve the above-mentioned problems, the invention according to claim 1 comprises a first voltage-dividing capacitor,
A second voltage dividing capacitor electrically connected in series to the first voltage dividing capacitor; and a second voltage dividing capacitor electrically connected in parallel to the second voltage dividing capacitor to convert a divided voltage into an optical signal. And an optical sensor unit. Then, the first voltage dividing capacitor, the second voltage dividing capacitor, and the optical sensor unit are integrally covered with an insulating material. The first voltage dividing capacitor includes a high-voltage electrode to which a voltage to be measured is applied,
It comprises an intermediate electrode and a ceramic capacitor inserted between the high-voltage electrode and the intermediate electrode. The second voltage dividing capacitor includes the intermediate electrode, a ground electrode, and a ceramic capacitor inserted between the intermediate electrode and the ground electrode.

[0007]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings. FIG. 1 is a partial cross-sectional view of the embodiment.
A high-voltage electrode 2 to which a voltage to be measured is applied, an intermediate electrode 3,
A first voltage dividing capacitor is constituted by the ceramic capacitor 4 inserted between the high voltage electrode 2 and the intermediate electrode 3.
A second voltage dividing capacitor is constituted by the intermediate electrode 3, the ground electrode 5, and the ceramic capacitor 6 inserted between the intermediate electrode 3 and the ground electrode 5. Then, the first voltage dividing capacitor and the second voltage dividing capacitor are electrically connected in series. This is, as shown in FIG.
This is achieved by arranging and bonding the ceramic capacitor 4, the intermediate electrode 3, the ceramic capacitor 6, and the ground electrode 5 in this order. Further, an optical sensor unit 7 including an E / O converter and a battery (not shown) is electrically connected in parallel to the second voltage dividing capacitor, and is arranged below the voltage dividing capacitor. Note that the optical sensor unit 7 is housed in a sensor housing box 8.

The embodiment is characterized in that the first voltage dividing capacitor, the second voltage dividing capacitor, and the optical sensor section 7 are integrally coated with an outdoor epoxy resin 9 which is an insulating material. . The insulating material is not limited to the epoxy resin for outdoor use, and may be covered with, for example, rubber or porcelain.

A lead wire 10 is drawn out from the high-voltage electrode 2 and electrically connected to a conductor to be measured (not shown) such as an overhead ground wire phase conductor or a lightning rod on a chimney.

On the other hand, the ground electrode 5 is provided with a terminal (not shown) for connecting to the outside and grounding. Further, an optical fiber cable 11 for transmitting the optical signal converted by the E / O converter is drawn out of the sensor storage box 8 and guided to the measurement processing unit. Note that the end of the optical sensor unit 7 is grounded.

The ceramic capacitors 4 and 6 hardly change in capacitance due to temperature changes, and the reliability of measured values according to the present embodiment is high. By changing the capacitance of the ceramic capacitors 4 and 6, the voltage dividing ratio of the voltage to be measured determined by the first voltage dividing capacitor, the second voltage dividing capacitor, etc. can be set as appropriate, and all voltage measurement such as harmonic voltage can be performed. Needless to say,

[0012]

As described above, according to the first aspect of the present invention, the first voltage dividing capacitor, the second voltage dividing capacitor, and the optical sensor are integrally formed of an insulating material.
It is possible to provide an optical VT that is small and easy to handle when mounted on a conductor to be measured. Further, the manufacturing cost can be reduced and the entire system can be simplified.

[Brief description of the drawings]

FIG. 1 is a partial sectional view of an embodiment.

FIG. 2 is a configuration diagram of a conventional system.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Optical VT 2 High voltage electrode 3 Intermediate electrode 4 Ceramic capacitor 5 Ground electrode 6 Ceramic capacitor 7 Optical sensor part 8 Sensor storage box 9 Outdoor epoxy resin 10 Lead wire 11 Optical fiber cable

 ────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Takahiro Otsuka 1-7-1, Yurakucho, Chiyoda-ku, Tokyo Inside Toko Electric Co., Ltd. (72) Inventor Nobuhiko Watanabe 1-7-1, Yurakucho, Chiyoda-ku, Tokyo Toko Electric Co., Ltd.

Claims (1)

[Claims] 1. A high-voltage electrode to which a voltage to be measured is applied, an intermediate electrode, a first voltage-dividing capacitor including a ceramic capacitor inserted between the high-voltage electrode and the intermediate electrode, and the first voltage-dividing capacitor. Electrically connected in series with the capacitor,
A second capacitor comprising the intermediate electrode, a ground electrode, and a ceramic capacitor inserted between the intermediate electrode and the ground electrode.
And a voltage dividing capacitor, which is electrically connected in parallel to the second voltage dividing capacitor,
An optical sensor unit for converting the divided voltage into an optical signal, wherein the first voltage dividing capacitor, the second voltage dividing capacitor, and the optical sensor unit are integrally covered with an insulating material. Light VT.