JPH0136139Y2 - - Google Patents

Description

[Detailed Description of the Invention] This invention relates to a voltage divider for detecting defective insulators among multiple suspended insulators in high-voltage power transmission and distribution lines.

Suspended insulators used for special high-voltage overhead transmission and distribution lines with a nominal voltage of 154 to 500 kV are suspended by connecting a number of insulators to a length of 8 to 10 m using insulator metal fittings. If a defective insulator due to contamination or aging is present in the multiple suspended insulators, it may cause an accident, so a voltage divider is used to detect the defective insulator and measures and detects the shared voltage, potential difference, etc. of each insulator. are doing.

This voltage divider is configured to measure by bringing two contact electrodes insulated and supported by an insulator into contact with an insulator metal fitting that connects an insulator. The leakage current caused by the contact electrode may cause measurement errors, and since the measurement result by the contact electrode is connected to a meter or display device through a cord, it has the disadvantage that it is easily affected by high voltage.

The purpose of this invention is to eliminate the above-mentioned drawbacks. Referring to the attached drawings showing the embodiments, numeral 1 in the drawing shows a voltage divider main body made of a material with good insulation properties, such as epoxy resin, which is shaped like an umbrella. A plurality of bodies a are integrally superposed to form pleats, and each umbrella-like body a is larger at the top and smaller toward the bottom, making the whole into an inverted triangle shape. Reference numeral 2 denotes a ring-shaped primary electrode provided within the main body, and is fixed to a conductor tube 3 extending outside the main body. Reference numeral 4 denotes a secondary electrode facing the primary electrode 2, and a conductor tube 5 integrated with the electrode extends in a direction opposite to the conductor tube 3 of the primary electrode 2 and projects outside the main body 1. Reference numeral 6 denotes a tertiary electrode provided between the primary electrode 2 and the secondary electrode 4, and a conductor rod 7 integrated with the electrode passes through the center of the primary electrode 2 and the conductor tube 3, and extends through the center of the conductor tube 3.
The electrodes 2, 4, 6, conductor tubes 3, 5, and conductor rod 7 are incorporated into a mold during molding of the voltage divider main body, and are embedded and fixed in the resin constituting the main body.

8 and 9 are contact electrodes fixed to the conductor tubes 3 and 5;
10 is a conductor tube 3 and a lead wire connected to the conductor rod 7; 11 is a long operating rod made of an insulating material and connected to the conductor tube 5; 12 is an electro-optic crystal such as bismuth silicon oxide (BSO); 13 is a light-emitting element, 14 is a light-receiving element, 15 is an optical fiber for optical transmission, 16 is a light and voltage converter that converts light into an electrical quantity, and 17 is a voltage converter. Indicates a meter or other display device.

In the above detection device, the equivalent circuit including the electro-optic crystal _of the optical electric field sensor ₁₂ is as shown in FIG. The capacitance C ₂ between the secondary electrode 4 is the capacitance C ₃ between the secondary electrode 4 and the tertiary electrode 6. The capacitance C ₄ is the capacitance between the primary electrode 2 and the tertiary electrode 6. The input voltage V ₂ of the optical electric field sensor 12 is calculated as V ₂ = C ₂ /C ₂ +C ₃ +C ₁ V ₁ , so the contact electrode 8 is the low voltage side insulator metal fitting, and the contact electrode 9 is the high voltage side. The voltage detected between the primary electrode 2 and the tertiary electrode 6 is converted into light by the optical electric field sensor 12, which is displayed on a meter or display device 17 via the optical fiber 15.

According to this invention, as mentioned above, the voltage divider main body 1 has a pleated inverted triangle formed by overlapping a plurality of umbrella-shaped bodies a, and the second and subsequent stages are covered by the upper umbrella-shaped body a, so even if the lower Even if the periphery of the umbrella-shaped body a gets wet, the concave portion between the folds will not get wet, so there will be no measurement error due to the wetness of the voltage divider body 1, and reliable detection can be achieved.

Furthermore, the measurement results are transmitted to the display device 17 via the optical fiber 15 and are electrically completely isolated and insulated from the contact electrodes, so the meter and display device are not affected by high voltage, improving safety. .

[Brief explanation of the drawing]

The drawings show an example of an embodiment of this invention, and FIG. 1 is a front view, FIG. 2 is a longitudinal sectional front view of the voltage divider main body, and FIG. 3 is an equivalent circuit diagram. 1... Voltage divider main body, a... Umbrella-shaped body, 2, 4, 6
... Electrode, 8, 9 ... Contact electrode, 12 ... Optical electric field sensor, 15 ... Optical fiber, 17 ... Display device.

Claims (1)

[Claims for Utility Model Registration] (1) The outer shape of the voltage divider body made of an insulating synthetic resin in which the required electrodes are embedded is an umbrella shape with folds formed by overlapping the umbrella shape, with the umbrella shape extending downward from the top. A voltage divider for detecting defective insulators, characterized by its small size and inverted triangular shape. (2) Scope of Utility Model Registration Claim 1, characterized in that the detected value detected by the contact electrode of the voltage divider main body is converted into light, and the detected value is transmitted to a meter and a display device via an optical fiber. Voltage divider for detecting defective insulators as described.