JPS62116265A - Voltage detector - Google Patents

Abstract

PURPOSE:To attain to miniaturize the titled detector, by receiving a molded potential divider and an optical fiber voltage sensor using an electrooptical effect element in the hollow part of an insulator. CONSTITUTION:A voltage detector is constituted so that a molded potential divider 7 is inserted in and fixed to the hollow part 5 of a pin insulator 1 corresponding to a float electrode 8 and a lead-out wire 14 for the float electrode and a lead-out wire 15 for an earth electrode are integrally molded along with the potential divider 7 and an optical fiber voltage sensor 11 is mounted to both lead-out wires 14, 15. The sensor 11 is a Pockels effect applied one and consists of a polarizer, a 1/4 wavelength plate, an electrooptical effect element and an analyser and is constituted so that light emitted from an optical fiber is projected to the polarizer and the light passing through the electrooptical effect element is received by the optical fiber outside the analyser. By this constitution, the voltage detector can be miniaturized.

Description

[Detailed description of the invention] [Industrial application field] The present invention relates to a voltage detector using an electro-optical element.

[Prior Art and Problems] Voltage measurement on power distribution lines is effective for voltage management of power distribution systems and detection of ground faults caused by zero-phase voltage.

However, existing PT (potential transformers) and PD (capacitance voltage dividers) need to be placed in strong rainproof cases to ensure waterproofness, weather resistance, and mechanical strength. In addition to being large in size, there is a risk of damage to the measurement circuit due to lightning (reading lightning, etc.) and surge intrusion from the detection section or lead wire (signal transmission section). There is.

Furthermore, there is a risk that measurement errors may occur due to the intrusion of noise due to interference, making it difficult to apply conventional PT and PD.

[Object of the Invention] The object of the present invention is to create an extremely compact voltage detector by housing an optical fiber voltage sensor consisting of a capacitor-type voltage divider and an electro-optical element in a relatively small insulator for supporting power distribution lines such as a pin insulator. It's about getting.

[Structure of the Invention] The present invention is characterized in that an optical fiber voltage sensor using a mold voltage divider and an electro-optic effect element is housed in a hollow part of an insulator such as a pin insulator.

FIG. 1 shows an embodiment of the invention. The present invention will be explained below with reference to Examples.

In the figure, reference numeral 1 indicates a pin insulator, and the pin insulator 1 has a shape that can be opened at the bottom and has a hollow portion 5 inside. 2 constitutes a bottom cover of the pin insulator 1, 3 is a bolt connected to the bottom cover 2, and the bottom cover 2 seals the pin insulator 1 and forms a hollow part inside. Also, 4 is pin insulator 1
This is a wire support groove formed on the top surface 6 of the wire support groove. The pin insulator 1 is made of an insulator.

7 is a molded voltage divider, 8 is a floating electrode, 9 is a dielectric, and 10 is a ground electrode. The mold voltage divider 7 is created in advance using a separate mold in accordance with the formation of the hollow portion 5. For example, an adhesive is applied to a portion of the hollow portion 5 corresponding to the floating electrode 8, and the mold voltage divider 7 is inserted and fixed. The dielectric material of the voltage divider 7 is epoxy resin, E
P rubber, silicone rubber, PE1 crosslinked polyethylene, etc. are selected and molded between the two electrodes.

In this case, an optical fiber voltage sensor (2), which will be described later and is made of an electro-optical element, an optical fiber, etc., is electrically connected to the floating electrode 8 and the ground electrode 10, and the other optical fiber voltage sensor (2) is electrically connected to the floating electrode 8 and the ground electrode 10.
It is also possible to connect the fiber optic fiber +2°13 to the optical fiber used by the predecessor in advance and integrally mold the fiber.

Now, it is assumed that a floating electrode lead wire 14 and a ground electrode lead wire 15 are integrally molded into the molded voltage divider 7, and an optical fiber voltage sensor is attached to these.

The voltage sensor 11 applies the Pockels effect, and consists of a polarizer, a 174-wave plate, an electro-optic effect element, and an analyzer, and projects output light from an optical fiber onto the polarizer.
It is configured so that the light passing through the electro-optic effect element is received by an optical fiber outside the analyzer.

In addition, as an electro-optical element, B50 (B 1t2s
io addition).

BGO (Bi+2GeOz), LiNbO3+ Zn
S is used.

The optical fiber voltage sensor 11 having such a configuration is assembled and housed in a container in advance, and is connected to the mold voltage divider 7 side and the outside side as described above. For connection to the outside, 1G is an optical fiber cable that passes through the bottom cover 2 and is pulled out, and a ground terminal 17 is attached to the bottom cover 2, and the ground terminal 17 is connected to the ground electrode 13 and the ground side of the electro-optical element. The other end of the optical fiber cable 6 is connected to Elo and the O/E device.

Regarding grounding, although the diagram shows a configuration in which a ground wire can be connected to the ground terminal 17, the optical fiber cable 16
The tension member may be a metal wire, and one end of the tension member may be connected to the ground side of the electro-optical element 101. This detector is used, for example, in the form of a cane, which is mounted on a telephone pole and supports electric wires in the wire support grooves on the top surface of the pole.

The present invention is suitable as a voltage detector for overhead distribution lines of 22 kV or less.

[Effects] The present invention has a detector built into the insulator, which is almost the same size as a conventional pin insulator, and has a medium-sized external shape, making it easy to install without changing the form of the conventional power distribution system. can do.

In addition, the optical fiber voltage sensor and voltage divider are built into the insulator and are held in a sealed manner, making it highly weather resistant.
Furthermore, there is almost no noise or surge intrusion into the measurement circuit, allowing stable measurement.

[Brief explanation of drawings]

Fig. 1 shows an embodiment of the present invention. 1... A pin insulator with a hollow part, 2... A bottom cover of the pin insulator, 3... Mounting with bolts, 4... Wire support. groove,
5...Hollow part of the pin insulator, 6...Top surface of the pin insulator,
7...Mold voltage divider, 8...Floating electrode, 9...
Dielectric material, 10... Earth electrode, 11... Optical fiber voltage sensor, 1B... Optical fiber cable, quantity 7...
・Earth terminal.

Claims (1)

[Claims] (1) A voltage detector characterized in that an optical fiber voltage sensor using a molded voltage divider and an electro-optic effect element is housed in a hollow part of an insulator.