JPS5939395Y2 - Insulated operating rod - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to alleviating electrical stress at the end of an insulated operating rod mounting bracket.

Generally, in a dead tank type switchgear, in order to operate the movable electrode, it is necessary to transmit the driving force from the operating mechanism to the movable electrode in some way.

However, since a high voltage is applied to the fixed and movable electrodes housed oppositely in the grounded container, it is necessary to transmit the driving force while being electrically insulated from the operating mechanism section.

Therefore, an insulated operating rod that has mechanical strength and excellent electrical insulation properties, such as a normally cast product made of epoxy resin or FRP.
Alternatively, fortified water or the like may be used.

As shown in Figure 1, the conventional buffer type breaker is
Inside the grounding tank 1, a movable contact 2 and a fixed contact 3 are opposed to each other.

The movable contact 2 includes a drive lever 4, an insulated operating rod 5, and a shock absorber 6.
, is mechanically transmitted to the operating mechanism section 8 via the toggle mechanism T.

A current-carrying conductor electrically connected to the fixed contact 3 is supported from the tank 1 by an insulating spacer 9.

Further, in a multi-point circuit breaker, a voltage sharing capacitor 10 is provided in order to equalize the voltage applied between poles of each circuit breaker.

High-pressure gas is blown into the breaker part by an insulating nozzle 11 and a buffer piston 12 while the circuit is being opened.

Furthermore, the breaker is supported by an insulating cylinder 13 from the grounding tank 1, and an insulating operating rod 5 is disposed inside this insulating cylinder 13.

When using such a breaker, especially in the cut-off state, the mounting bracket 15 of the insulated operating rod 5 is attached to the insulating tube 1 as shown in FIG.
It protrudes from the mounting seat 16 of No. 3 toward the grounding saddle portion 17 side.

For this reason, if the tip of the mounting bracket 15 is an edge part,
The equipotential lines 18 are concentrated, the stress at point A becomes high, and there is a possibility that dielectric breakdown will occur from this part.

Another point that should be improved is that the larger the diameter of the insulated operating rod 5, the higher the stress at point A.

The purpose of this invention was to solve the above-mentioned problems, and to alleviate the electric field near the high voltage side mounting bracket of the insulated operating rod
An object of the present invention is to provide an insulated operating rod with excellent dielectric strength.

The present invention will be explained below with reference to the embodiments shown in FIGS. 3 and 4.

The same parts as in FIG. 2 are given the same symbols.

As shown in FIG. 3, the high voltage charging part side of the hollow insulated operating rod 5,
A hemispherical bar-shaped electric field mitigation shield 20 is provided on the inner surface, and the curvature of the tip end portion 21 of the mounting bracket 15 is increased to alleviate stress at point A.

As shown in Figure 4, 5rIC inner shield 20, mounting bracket 1
5. A curvature is provided at the tip, and a gap d is added to the contact surface as a measure to alleviate creeping stress at the contact surface between the insulator surface and the metal.
may be provided.

This method can be applied not only to hollow wire operating rods but also to solid insulated operating rods by integrally casting the inner shield 20 when manufacturing the operating rod.

This invention has shown an example of mounting the insulated operating rod on the side of the high-voltage live part, but for example, when the breaker shown in Fig. 1 is turned on, if the electric field near the insulated operating rod mounting bracket on the grounding tank side is severe, the present invention can be applied. By applying this, electric field relaxation can be measured.

Other embodiments of the present invention are shown in FIGS. 5a and 5bK.

The same parts or parts having the same functions as those in FIGS. 1 to 4 are given the same reference numerals.

Figure 5a shows an SF6 gas disconnect switch.When the insulating rod 5 is turned off, it moves to the right, so most of the stress is applied to the mounting bracket 21. Therefore, by making the ground side electrode of the insulating rod have an appropriate structure as shown in FIG.

The present invention can also be implemented in other grounding devices and the like.

As described above, according to the present invention, in order to alleviate the electric field near the high- and low-voltage side mounting brackets of insulated operation rods for driving circuit breakers, disconnectors, grounding devices, etc., a shield electrode is attached to the inner surface of the insulated iron, and a shield electrode is attached to the outside. By providing a curvature at the tip of the metal fitting, it is possible to prevent penetration failure or creepage failure of the operating rod and provide an insulated operating rod with excellent withstand voltage.

[Brief explanation of the drawing]

Fig. 1 is a partial cross-sectional side view showing a conventional buffer type breaker, Fig. 2 is an electric field distribution diagram showing the operating rod and its electric field state during a conventional buffer type breaker, and Figs. 3 and 4 respectively. Vertical sectional view showing the main parts of the insulated operating rod of the present invention, Figures 5a and b
1 shows another embodiment of the present invention, a is a partially sectional side view, and b is a partially sectional side view.
is an enlarged cross-sectional view of the 'A' section shown in Figure a. 1...Tank, 2...Movable contact, 3
...Fixed contact, 4... Drive lever,
5...Insulated operating rod, 6...Japanese shock absorber, 7.
...Toggle mechanism, 8... Mechanism section, 9...
... Insulation spacer, 10 ... Capacitor, 11 ... Insulation nozzle, 12 ... Buffer piston, 13 ... Support insulating cylinder, 15 ...
...Insulation rod mounting bracket, 16...Mounting seat, 17
・・・・・・Grounding side saddle part, 18・・・Equipotential wire, 19・・・Mounting seat, 20・・・Internal shield, 21・・・・Installation Metal fittings, 24...
High pressure shield, 25...Cover, 26...
...Display device.

Claims (1)

[Scope of utility model registration request] Insulation provided for storing movable and fixed electrodes in a grounded tank insulated from the grounded tank together with compressed gas, and for transmitting driving force to the movable electrode from an operation mechanism section that is directly connected to the grounded tank or installed separately. The operating rod is provided with a mounting bracket having a curvature at the tip on the outer peripheral surface of the end facing the high-voltage charging part of the insulated operating rod, and a curvature at the tip of the mounting bracket is provided inside the end of the insulated operating rod. An insulated operating rod characterized by having an internal shield having a curved portion at the tip that protrudes beyond the tip.