JPH01213925A - Power breaker - Google Patents

Abstract

PURPOSE:To enhance the anti-seismic characteristic by mounting an attachment to a shutoff part using a spring and a damper of viscous friction type. CONSTITUTION:Attachment such as capacitor 5 is mounted to a shutoff part 1 parallelly by a spring and a damper of viscous friction type 10. According to this constitution, seismic vibration of the shutoff part 1, etc., in the upper part of a supporting insulation 2 is converted into vibration of the attachment such as capacitor 5, and its energy is absorbed by viscous friction of the damper 10 to relieve the force or a bending moment applied to the support insulation 2. Thus a shutoff part for electric power excellent in anti-seismic performance is obtained.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a structure for improving the seismic performance of a power circuit breaker.

[Conventional technology]

Figure 6 shows, for example, Mitsubishi Electric Technical Report Vol. 54, No. 9 (1980
), page 65, 9 illustrates the structure of the circuit breaker shown in the photograph of FIG. 12. In the figure, (1) is the cut-off part, and the contactor that switches on and off the current and the connecting mechanism that operates it are housed inside the insulator tube. (2) is the support insulator, which is made of insulator tube and It is fixed to the structure (3). (4
) is an operating mechanism, which is connected to the connecting mechanism of the interrupting part (1) via an insulating rod in the support insulator (2). (5) is a capacitor and is a cut-off part (1).

It is connected in parallel with the mounting bracket (61 (7)).

(8) is a terminal, between which two cut-off parts (1) are connected in series, and when the cut-off part (1) is closed, current flows through them.On the other hand, when the cut-off part (1) is opened, , the voltage is shared and withstood by the two cutoff parts (1), but the capacitor (
Since the capacitance of 5) is quite large, it helps to equalize the voltage distribution of each interrupting section (1). In addition, the capacitor +11 has a great effect on improving the breaking performance, and the recent large breaking 1
Circuit breakers that require a lot of force are now being used in circuit breakers that are quite large and heavy.

(9) is a shield ring for electric field relaxation.

[Problem to be solved by the invention]

In such circuit breakers, the supporting insulators are long for high voltages, and the weight of the breaking section is also large for high-current circuit breakers, so when vibrations from an earthquake are applied, the supporting insulators are subject to a large bending moment. In order to function, the supporting insulation requires large diameter and expensive porcelain tubing. Furthermore, countermeasures such as the installation of reinforcing insulators are required, and if these measures are insufficient, accidents may occur in which circuit breakers collapse due to earthquakes.

This invention was made to solve the above-mentioned problems, and an object of the present invention is to provide a power circuit breaker that reduces the bending moment and force acting on supporting insulators in the event of an earthquake and has excellent earthquake resistance. It is an object.

[Means to solve the problem]

In the power circuit breaker according to the present invention, accessories such as a capacitor installed in parallel to the circuit breaker are attached using a spring and a viscous friction damper.

[For production]

The power circuit breaker of this invention converts the vibration of the upper interrupting part of the supporting insulator caused by an earthquake into the vibration of accessories such as a capacitor, and absorbs the energy by the viscous friction of the damper. Reduce stress caused by

[Embodiments of the invention]

An embodiment of the present invention will be described below with reference to the drawings. 1st
In the figure, (1) to (5) are the same as the conventional one. +61+7) is a mounting bracket that also serves as a shield ring. Furthermore, a spring-loaded damper O1 is attached to the mounting bracket t6+F71, and the capacitor (5) is supported via this. Figures 2 and 3 are partial cross-sectional views of the vicinity of the spring-loaded damper αC. , respectively, the capacitor (
5) as seen from the axis-perpendicular direction and the axial direction.

Uυ is a cylinder, t13 is a piston, and U is a piston rod, which is fixed to the mounting bracket (7). The circle is a spring, which may be placed separately outside the cylinder, α9 is a ridge, and Oe is a hole through which a viscous substance passes while producing friction. The spring-equipped damper a is provided with a set of cylinder circles that are oriented perpendicular to the axial direction of the capacitor (5) in a horizontal plane. αη is a flexible connection wire that electrically connects the capacitor (5) to the mounting bracket (7), and similarly connects the capacitor (5) to the mounting bracket (6).
) is provided with a connecting line at the other end. (Not shown) In a circuit breaker with this structure,
is performed in the same way as the conventional method described above, but when an earthquake force is applied, it works as follows.

When an earthquake force is applied to the supporting structure (3), the supporting insulator (2)
), the interrupter (1), and the capacitor (5), and each part begins to vibrate. At this time, if the spring constant of the mounting part of the capacitor (5) and the viscous friction damping of the damper are selected appropriately, most of the energy from the earthquake will be injected into the vibration of the capacitor (5), and moreover, the viscous friction damping of the damper will inject this energy. Since much of the energy is dissipated, the stress or bending moment on the supporting insulation (2) is very small.

Support insulators are the weakest point in circuit breakers in terms of seismic strength (2)
Even if it is made smaller, sufficient seismic strength can be obtained, so the economic effect is large.

The spring constant of the spring for attaching accessories such as capacitors is
Mechanical mechanics shows that the natural frequency (fd) of this part should be in the following ratio to the natural frequency (ri) of the cutoff part.In other words, the mass of the capacitor part is Md,
Other cut-off parts and the like are in the main body 1+.

Here, the quality 31M of the main body such as the interrupting part can be approximated by M=M1+□40", assuming that the interrupting part with mass M1 is mounted on the upper end of the support insulator of the cantilever beam with mass M3. Also, the damper damping C has a ratio of (1) to the limit damping Cc.
It is best to choose one that follows the formula.

FIG. 4 shows the state of vibration when the damping C is changed, expressed in terms of the stress at the lower end of the insulating support, in this case the bending moment. The relationship indicated by the dotted line α is C=■, that is,
When the capacitor is rigidly mounted without a spring, the relationship between -dotted and dashed line α shows the case where C=0, that is, there is only a spring and no damper, and there is no damping. On the other hand, the relationship indicated by the solid line (■) indicates the case where the damping of the spring and Dunno (-) is selected as shown in equation (1), and the maximum stress becomes extremely small.

In the above example, the structure of the spring-equipped active damper is made up of a cylinder and piston filled with a spring and viscous fluid, but as shown in Fig. It is also possible to use a so-called anti-vibration rubber ring.

As shown in the figure, the simplest structure of vibration isolating rubber can be installed by sandwiching the rubber between the metal fittings (2) and integrating the structure.

In addition to capacitors, resistors and shield rings can be used to improve the interrupting performance and suppress surges during power-on as accessories installed on the interrupter (1). good. Furthermore, although the above embodiments are for insulator-type circuit breakers, they can also be applied to tank-type circuit breakers with a similar structure in which the interrupting part and capacitor are supported in the tank by short support insulators. can do. Moreover, one blocking part (1) is provided vertically.
It can also be applied to a break-out circuit breaker by installing the spring-equipped damper so that its movable surface is horizontal.

〔Effect of the invention〕

As described above, according to the present invention, by attaching accessories such as a capacitor installed in parallel to the interrupting part via a spring-equipped viscous friction damper, a hook-up circuit breaker with excellent earthquake resistance can be obtained. Obtainable.

[Brief explanation of the drawing]

FIG. 1 is a structural diagram of a circuit breaker showing an embodiment of the present invention. 2 and 3 are partial cross-sectional views showing the structure of the capacitor mounting portion in FIG. 1. FIG. FIG. 4 is an explanatory diagram showing an example of vibration characteristics of a circuit breaker. FIG. 5 is a structural diagram showing an example in which vibration isolating rubber is applied as another embodiment of the present invention, and FIG. 6 is a structural diagram of a conventional circuit breaker. In the figure, (1) is the interrupting part, (2) is the support insulator, (
5) is a capacitor (accessory), a spring-loaded damper (
This is a viscous friction damper). Note that the same reference numerals in each figure indicate the same or corresponding parts. Agent Masuo Oiwa Figure 5, 5 Z~1111 Figure 6

Claims (1)

[Claims] (1) In a power circuit breaker that has a structure in which the interrupting section that cuts off and supplies large currents is insulated and supported from the ground potential section by a supporting insulator, the accessories installed on the interrupting section are attached using springs and viscous friction dampers. A power circuit breaker characterized by: