JP2000113797A - Seismosensitive trip auxiliary device for distribution line circuit breaker - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent occurrence of a fire due to over-heating of an electric apparatus, etc., or due to short-circuiting at a broken part, by automatically tripping a distribution circuit breaker in case of an earthquake. SOLUTION: One end of an attachment jig 1 is formed into a seating ring 2 and the other end thereof is attached to a handle 6 of a molded-case circuit breaker 7. A weight 3 fitted with a string 4 is put on the seating ring. The other end of the string 4 is tied to the attachment jig 1. This acts as a seismosensitive trip auxiliary device, and when an earthquake arises, the weight falls by a preset vibration and the force pulls the handle down to cut off a power supply.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an auxiliary device for seismic isolation of a power distribution breaker that shuts off power with the force of a weight falling during an earthquake.

[0002]

2. Description of the Related Art Conventional power distribution breakers are operated manually or by overcurrent, and those having a function of shutting off the power supply according to the magnitude of vibration during an earthquake are rarely used. In the previous Great Hanshin Earthquake, fires occurred due to overheating of heaters such as electric stoves or short-circuits in damaged parts of electric wires or electric equipment when there was no power outage due to the earthquake, or when power was restored after power outage. Have been reported. This is because there was no power distribution breaker with seismic isolation function, and electricity was supplied to the building in a dangerous state.

[0003]

According to the present invention, the power supply can be automatically turned off in the event of an earthquake of a certain scale (eg, a seismic intensity of 5 or more), and it can be easily attached to an existing distribution breaker. We considered what we could do.

[0004]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Referring to FIG. 1, one end is a pedestal ring (2), and the other end is a mounting jig (processed into a shape easily attachable to a handle (6) of a breaker). There is 1). A weight (3) with a string (4) is placed on the base ring, and the other end of the string is tied to a mounting jig. A jig drop prevention pin (5) is attached to the hole of the handle (if there is no hole, it is fixed with an adhesive or the like). FIG. 1A shows a state before operation attached to the distribution breaker (7). The material and size (ie, weight) of the weight are determined according to the breaking strength of the handle of the breaker. (In general, it can be aggregated into several types of weights). On the other hand, the size of the pedestal ring is determined experimentally from the set seismic intensity floor and the size of the weight. Further, the shape of the weight is basically spherical, but depending on the method of selecting the set seismic intensity level, shapes such as an egg shape and an inverted truncated cone may be considered.

[0005]

The auxiliary tool is mounted on a distribution breaker as shown in FIG. In this state, an earthquake occurs, and when the intensity exceeds the set seismic intensity level, the weight falls from the pedestal ring due to the vibration. When the cord is fully extended, the force of the drop is transmitted to the mounting jig, and the handle of the breaker can be pulled down to shut off the power.

[0006]

According to the present invention, the power supply to the building can be cut off when a large earthquake occurs. Therefore, even if there is no power outage, it is possible to prevent a fire caused by overturning or breakage of the electric appliances in the building. On the other hand, when re-energizing after a power outage, the safety inside the building should be sufficiently confirmed, and then the power can be turned on inside the building by turning on the power distribution breaker while attending, so that fires can be prevented.

[Brief description of the drawings]

FIG. 1 is a perspective view of the mounting of the present invention

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1; Mounting jig 2; Pedestal ring 3; Weight 4; String 5; Jig fall prevention pin 6; Breaker handle 7;

Claims (1)

[Claims] 1. A seismic isolation aid that attaches a jig with a weight with a string on a pedestal ring to a power distribution breaker, and shuts off the power using the force of the weight's drop in the event of an earthquake.