JPH1189078A - Vibration breaker - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide vibration breakers which can be made to operate successively and accurately, following the vibration of an earthquake so as to successively cut off electrical paths. SOLUTION: The output (a) of a sensor 10 which detects a vibration is inputted to an amplification/attenuation factor regulation unit 12 and amplified/ attenuated in accordance with the set value of a sensitivity setting unit 13, which arbitrarily sets an operating seismic intensity. Only when the output (c) of the regulation unit 12 exceeds a threshold, a 1st comparison unit 14 generate digital signal outputs (d) which are integrated by an integration unit 15. Only when the output (e) of the integration unit 15 exceeds the set value of a time extention setting unit 17 which arbitrarily sets an operation detection time, a 2nd comparison unit 16 supplies the output (f) to a tripping circuit 18.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a seismic breaker capable of automatically shutting off a circuit by detecting a shaking of an earthquake.

[0002]

2. Description of the Related Art An earthquake sensor is provided for sensing shaking.
2. Description of the Related Art A seismic breaker that outputs a trip signal when the output exceeds a set value of a seismic intensity to cut off a circuit is conventionally known. There is also known a seismic breaker in which a ground fault circuit is formed by the shaking of an earthquake and a ground fault circuit breaker is operated. However, such a conventional seismic breaker has the following problems.

[0003] That is, a general electric circuit system is composed of a main breaker 1 and a plurality of lower branch breakers 2, 3, and 4, as shown in FIG. For example, the branch breaker 2 is connected to a power supply for combustion equipment, the branch breaker 3 is connected to a power supply for water supply equipment, the branch breaker 4 is connected to a power supply for lighting and information transmission equipment, and each of the breakers 1-4 is a conventional seismic breaker. Assume that If a building equipped with such an electric circuit system is hit by an earthquake that greatly exceeds the seismic intensity set value of each breaker, conventionally, the main breaker 1 operates and suddenly cuts off all electric circuits, Even if the main breaker 1 does not operate, the branch breaker 3 may operate to stop the water supply necessary for disaster prevention safety, or the branch breaker 4 may operate to turn off the lighting required for evacuation.

The above problem can be avoided to some extent by changing the set value of the seismic intensity of each breaker. However, since the shaking of the earthquake differs depending on the installation location of the breaker, it is difficult to set each breaker so that it is shut off exactly in order. Further, in the case of a large earthquake that greatly exceeds the set values of all breakers, setting of such set values has little meaning, and the above-described problem may occur.

[0005]

SUMMARY OF THE INVENTION The present invention solves the above-mentioned conventional problems, and makes it possible to operate each breaker accurately and in sequence in response to the shaking of an earthquake, and to sequentially cut off the electric circuit. The purpose is to provide a seismic breaker.

[0006]

According to the present invention, there is provided a seismic breaker for detecting a shake, a sensitivity setting unit for arbitrarily setting an operating seismic intensity, and an output of the sensor. An amplification attenuation rate adjustment unit that increases or decreases according to a setting value of a sensitivity setting unit, a first comparison unit that generates an output only when an output of the amplification attenuation ratio adjustment unit exceeds a threshold value, and an output of the first comparison unit. An integrating section for integrating, a time delay setting section for arbitrarily setting an operation detection time, a second comparing section for outputting only when an output of the integrating section exceeds a set value of the time delay setting section, And a trip circuit for outputting a trip signal in accordance with an output of the comparing section.

Since the seismic breaker of the present invention includes the sensitivity setting section and the time delay setting section for arbitrarily setting the operation detection time, the lower branch breaker operates from the upper main breaker in accordance with the seismic intensity. In addition, when a large earthquake that greatly exceeds the set value occurs, the breakers can be sequentially operated according to the priority of the circuit. Details of the operation will be described below.

[0008]

FIG. 2 is a circuit diagram of a seismic breaker according to the present invention. In FIG. 2, reference numeral 10 denotes a sensor for detecting an earthquake shaking, and reference numeral 11 denotes an output a of the sensor 10.
Is a processing unit that amplifies the waveform and performs waveform processing. In the present invention, the processing unit 11 is not essential. Reference numeral 12 denotes an amplification attenuation rate adjustment unit that attenuates or amplifies the output “a” of the sensor 10 or the output “b” of the processing unit 11. Therefore, the magnitude of the output c of the amplification attenuation rate adjustment unit 12 can be arbitrarily adjusted by the sensitivity setting unit 13, whereby the seismic intensity at which each breaker operates can be arbitrarily set.

Reference numeral 14 denotes a first comparing section which compares the output c of the amplification attenuation rate adjusting section 12 with a threshold value and generates an output d by a digital signal only when the output exceeds the threshold value. The output d is integrated by the integrating unit 15, charged by the capacitor of the time generation unit, discharged by the resistor, and the output e of the integrating unit 15 increases as shown in FIG. 3 as long as the output d continues. I do. When the output d disappears, it decreases.

The output e of the accumulator 15 is supplied to a second comparator 16
Is input to The second comparing section 16 includes a time delay time setting section 17 for arbitrarily setting the operation detection time. The time delay time setting unit 17 can set the time delay time in seconds for each breaker as shown in FIG. As described above, the output e of the integrating unit 15 increases in proportion to time as long as the output d from the first comparing unit 14 continues, so that the setting of the time delay time has the same meaning as the level setting for the output e. With The second comparing section 16 outputs the output f only when the output e of the integrating section 15 exceeds the set value of the time delay setting section 17.
Is generated, and the trip circuit 18 generates a trip signal f by this output f to cut off the electric circuit.

FIG. 3 is a graph of a specific operation example. The electric circuit system constituted by the main breaker 1 as shown in FIG. 1 and a plurality of lower branch breakers 2, 3, and 4 is all constituted by the seismic breaker of the present invention, and the sensitivity setting unit 13 of each breaker is provided. The set values are as shown by the broken line in the upper part of FIG. In addition, the time delay setting unit 17 of each breaker
The setting value is adjusted in seconds on the display of FIG. 4, but has the same meaning by adjusting the tripping judgment level of each breaker up and down on an actual circuit. The building equipped with this electric circuit system was damaged by an earthquake.
In the upper part of FIG.

When each breaker detects a swing larger than that set by the respective sensitivity setting unit 13, an output d is generated from the first comparing unit 14, and the integrating unit 15 of each breaker outputs a signal d.
The output e is generated as shown in the middle part of FIG.

As shown in the figure, the output e of the accumulator 15 of each breaker increases with a slight time difference. For example, the set values of the time delay setting units 17 of the breakers 2, 3, and 4 are set to 2 respectively. If it is set to 3, 4 seconds, the trip determination level of each breaker is set from low to high according to the number of seconds. And branch breaker 2
The output e of the integrating unit 15 (in this example, the power supply for the combustion equipment) first exceeds the set value, and the second comparing unit 16 generates the output f.
The trip circuit 18 cuts off the electric circuit. Next, the output e of the integrating unit 15 of the branch breaker 3 (power supply for water supply equipment) exceeds the set value, and finally, the output e of the integrating unit 15 of the branch breaker 4 (power supply for lighting and information transmission equipment) exceeds the set value. Finally, all the electric circuits are cut off.

In the example shown in FIG. 3, each breaker finally operated because the earthquake tremble was large. However, if the quake attenuates halfway, the output e of the integrating unit 15 decreases and returns to zero. The breaker for which the time delay is set arbitrarily, remains inactive. According to the conventional seismic breaker, even if the sensitivity is set in the same manner as above, all the breakers operate in a very short time as shown in the second row from the bottom of FIG. Therefore, it is difficult to perform an operation with a large time difference as in the seismic breaker of the present invention.

[0015]

As described in detail above, the seismic breaker of the present invention includes the sensitivity setting unit, the integrating unit, and the time delay setting unit for arbitrarily setting the operation detection time. The trip circuit is operated only when the output of the integrating section indicating the continuation of the shaking exceeds the set value of the time delay setting section. Therefore, the upper main breaker can be operated from the lower branch breaker according to the seismic intensity, and even if a large earthquake exceeding the set seismic intensity occurs, each breaker is kept constant according to the priority of the circuit. There is an advantage that they can be operated in this order.

[Brief description of the drawings]

FIG. 1 is a connection diagram of a breaker in a general electric circuit system.

FIG. 2 is a circuit configuration diagram of the seismic breaker of the present invention.

FIG. 3 is a graph of a specific operation example.

FIG. 4 is an external view of a seismic breaker according to the present invention.

[Explanation of symbols]

 REFERENCE SIGNS LIST 1 main breaker 2 branch breaker (power supply for combustion facility) 3 branch breaker (power supply for water supply facility) 4 branch breaker (power supply for lighting and information transmission facility) 10 sensor for detecting earthquake shaking 11 processing unit 12 amplification attenuation rate adjustment unit Reference Signs List 13 sensitivity setting unit 14 first comparing unit 15 integrating unit 16 second comparing unit 17 delay time setting unit 18 trip circuit a sensor output b processing unit output c amplification attenuation rate adjusting unit 12 output d first comparing unit Constant output of e e output of accumulator f output of second comparator

Claims (1)

[Claims] 1. A sensor for detecting shaking, a sensitivity setting unit for arbitrarily setting an operating seismic intensity, an amplification attenuation rate adjustment unit for increasing / decreasing an output of the sensor according to a setting value of the sensitivity setting unit, and an amplification attenuation rate adjustment unit. A first comparing section that generates an output only when the output exceeds a threshold value, an integrating section that integrates the output of the first comparing section, a time delay setting section that arbitrarily sets an operation detection time, and an integrating section And a trip circuit for outputting a trip signal by the output of the second comparing section only when the output of the second comparator section exceeds the set value of the time delay setting section. A seismic breaker.