JPS60129153A - Three-phase electric field curtain device - Google Patents

Abstract

PURPOSE:To prevent concentration of electric fields and to improve service life by providing bulging parts at the end of embedded electric field curtain electrodes among electric field curtain electrodes. CONSTITUTION:Embedded electric field curtain electrodes 2, 3 for two phases are juxtaposed in parallel apart at a space from each other on an insulating support layer 1. The top surfaces of the electrodes 2, 3 and distributing electrodes 4, 5 are coated by an internal dielectric layer 6 and the top surface of an internal dielectric layer 6 is coated with a surface dielectric layer 7. Exposed electric field curtain electrodes 8 for the phase are juxtaposed atop the layer 7 so as to parallel with the electrodes 2, 3 apart at a space from each other. Bulging parts 2a, 3a are formed ar the end of the electrodes 2, 3, 8 opposite from the side connected with the electrodes 4, 5 of the electrodes 2, 3.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention This invention relates to a three-phase electric field curtain device that prevents electric fields from concentrating on the ends of electric field curtain electrodes.

BACKGROUND OF THE INVENTION As a conventional three-phase electric field curtain device, for example, the one shown in FIGS. 1 and 2 is known. In the electric field curtain device, two-phase buried electric field curtain electrodes a and b are provided between the internal dielectric layer and the insulating support layer, and one-phase exposed electric field curtain electrode is provided on the surface dielectric layer coated on the internal dielectric layer. A structure in which C is arranged parallel to each other with an interval between them.

AC power is applied to the electric field curtain electrode α#'61' of each phase through the distribution electrode d from the first side. When such an electric field curtain device is used for a long period of time, there is a problem that the electric field concentrated at the ends of the valley electric field curtain electrodes α, b, and c causes dielectric breakdown of the dielectric t)@ directly above the ends.

Purpose of the Invention The present invention was made for the purpose of improving the above-mentioned problems, and it is an object of the present invention to provide a three-phase electric field curtain device that prevents the electric field from concentrating on the ends of the electric field curtain electrode, and to extend the life of the device itself. It is something that we try to do.

Constituent structure of the invention An embedded electric field curtain provided between an insulating support layer and an internal dielectric layer is provided at least at the end of the buried electric field curtain electrode of an exposed electric field curtain electrode provided on a surface electrode layer,
A three-phase electric field curtain device with a bulge to prevent electric field concentration.

Embodiment Hereinafter, an embodiment of the present invention will be described in detail with reference to the drawings shown in FIG. Electrodes 2, 3
are arranged parallel to each other with an interval between them. One end of each of these buried electric field curtain electrodes 2.3 has electrode sets 4, 5 for each phase.
The terminals 4α and 5α provided at the end of the insulating support layer 1 are connected to each other, and one end side of each set of electrodes 4゜5 is connected to terminals 4α and 5α provided at the end of the insulating support layer 1.
It is connected to the. The soil surface of the insulating support layer 1, the buried electric field curtain electrodes 2, 3, and the set electrodes 4, 5 is entirely covered with an internal dielectric layer 6 except for the terminals 4α and 5α. The top surface is covered with a surface dielectric layer 7. An exposed electric field curtain electrode 8 for one phase is arranged parallel to the buried electric field curtain electrode 2.3 at a distance from the upper surface of the surface electrode 7.

Both ends of these exposed electric field curtain electrodes 80 are connected to an electrode set 9, and one end of the electrode set 9 is connected to a terminal 9α arranged in parallel with the terminals 4α and 5α.

On the other hand, at the ends of the buried electric field curtain electrodes 2, 3 opposite to the connection side of the group electrodes 4, 5, among the electric field curtains %i2, 3, 8, there is a bulge 2α for preventing the electric field from concentrating.
3a is formed.

These bulges 2α, 3α are circular, for example, and are deflected toward the exposed electric field curtain electrode 9gAll.

Group electrodes 4, 5 connected to buried electric field curtain electrodes 2.3
At the intersection of the exposed electric field curtain electrode 8 and the exposed electric field curtain electrode 8, an insulating member 10 such as silicone rubber is interposed between the inner dielectric layer 6 and the surface dielectric layer 7, as shown in FIG.

Note that the bulges 2cL and 3α do not necessarily have to be circular. Only one end of the exposed electric field curtain electrode S is connected with the set electrode 9, and the other end of the exposed electric field curtain electrode S is connected to the pole 5 by the buried electric field curtain electrodes 2 and 3, as shown in FIG. When crossed, a bulge 8α is also provided at the end of the exposed electric field curtain electrode 8 to prevent concentration of the electric field.

Effects of the Invention As described in detail above, this invention provides a bulge at the end of the field curtain electrode to prevent the electric field from concentrating on the end, so even if used for a long period of time, the electric field will not decrease. The lifespan of the field curtain device can be greatly improved, since dielectric breakdown may occur due to concentration.

[Brief explanation of drawings]

Fig. 1 is a plan view of a conventional electric field curtain device, Fig. 2 is an enlarged view of the area in the circle in Fig. 1, Fig. 3 is a plan view of an electric field curtain device according to an embodiment of the present invention, and Fig. 4 is a plan view of the electric field curtain device according to an embodiment of the present invention. Fig. 3 is a sectional view taken along the line w-y, Fig. 5 is an enlarged view inside the circle V in Fig. 3, Fig. 6 is a sectional view of a grade-separated intersection, and Fig. 7- is an explanatory diagram showing another embodiment. be. 1 is an insulating support layer, 2 and 3 are buried electric field curtain electrodes, 2α
, 3α is a bulge, 6 is an internal dielectric layer, 7 is a surface dielectric layer, 8
is an exposed electric field curtain electrode. Applicant: Fuji Xerox Co., Ltd. Agent: Patent attorney: Masaaki Yonehara Patent attorney: Tadaha Hamamoto 1] K

Claims (1)

[Claims] Insulation support N1 and internal insulation 1! An electric field curtain electrode buried between the layers and an exposed electric field curtain electrode 8 on the surface dielectric layer 7 formed on the internal dielectric tNI 6,
Each of the above electric field curtain electrodes 2.3. A three-phase electric field curtain device comprising bulges 2α and 3α that prevent electric fields from concentrating at least on the ends of buried electric field curtain electrodes 2 and 3.