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State monitoring device for circuit breaker

A monitoring device and circuit breaker technology, which is applied to circuit devices, emergency protection circuit devices, and automatic disconnection emergency protection devices, etc., can solve problems such as damage to main contacts and achieve the effect of maintaining power supply.

Inactive Publication Date: 2008-05-07
MITSUBISHI ELECTRIC CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] In the case of a circuit breaker having such a current limiting structure, although the large overcurrent itself is limited or reduced, damage to the main contact often occurs.

Method used

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  • State monitoring device for circuit breaker
  • State monitoring device for circuit breaker
  • State monitoring device for circuit breaker

Examples

Experimental program
Comparison scheme
Effect test

Embodiment approach 1

[0014] figure 1 It is a circuit diagram showing the state monitoring device of a circuit breaker according to Embodiment 1 of the present invention. exist figure 1 Among them, the circuit breaker 100 is built with: a current detector 102, which detects the energized current flowing through the circuit 101; a main contact 103, which cuts off the energized current when the energized current is greater than or equal to a specified value; and an auxiliary switch 104, which is connected to the The main contact 103 is linked to detect the tripping state. Furthermore, the circuit breaker 100 is provided with a state monitoring device 200 which monitors the operating state of the circuit breaker and outputs an alarm signal when the operating state is abnormal.

[0015] In this state monitoring device 200, the overcurrent detection comparator 201 compares the current value I detected by the current detector 102 with the reference current value I set by the current setter 202. R , wh...

Embodiment approach 2

[0020] FIG. 2 is a circuit diagram showing Embodiment 2 of the present invention. In FIG. 2 , the structure up to the AND circuit 204 is the same as that of the first embodiment.

[0021] In Embodiment 2, the output signal of the AND circuit 204 by the counter 205, that is, even though the energized current value I is greater than the reference current value I R On the other hand, the electromagnetic reaction force is applied to the movable contact, and the number of occurrences of the state signal that the circuit breaker is not in the trip state is counted. The counter 205 stores the number of times that the consumption of the main contact 103 reaches a predetermined value, and if the number reaches the number, a signal is output to turn on the semiconductor switching element 206 , and the relay unit 207 outputs an alarm signal. In addition, the relay unit 207 may be replaced with another unit which notifies that the contact is depleted, such as an LED.

[0022] In the cir...

Embodiment approach 3

[0024] FIG. 3 is a circuit diagram showing Embodiment 3 of the present invention. In FIG. 3 , the structure up to the AND circuit 204 is the same as that of the first embodiment.

[0025] In Embodiment 3, if the signal of the AND circuit 204 is output, that is, even though the conduction current value I is greater than the reference current value I R On the other hand, the electromagnetic reaction force acts on the movable contact, and the signal that the circuit breaker is not tripped is output, the semiconductor switching element 208 is turned on, and the output from the relay unit 211 is generated, and the circuit breaker is electrically opened by the power supply 212. Closed electrical operating device 213, the circuit breaker is turned off and then turned on.

[0026] Here, since the circuit breaker cannot be disconnected if the main contact 103 is welded, the auxiliary switch 209 for detecting the open / closed state of the circuit breaker is kept closed, and the LED 210 ...

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Abstract

Astatemonitoring device for a circuit breaker is provided. When a movable contact is opened by electromagnetic repulsive force, in other words, when passed current attains a level at which the circuit breaker is allowed to carry out tripping operation but the operation of an opening / closing mechanism is still not carried out, the device can inform about the state. The device includes comparison means for comparing the value of passed current obtained from a current detector and a reference current value at which the opening operation of a movable contact is started by electromagnetic repulsive force generated between a fixed contact and the movable contact forming a main contact and generating an output if the value of the passed current is at least the reference current value, and warning signal output means for outputting a warning signal if the value of the passed current reaches a level at which the circuit breaker is allowed to carry out tripping operation and a signal obtained from an auxiliary switch continues to indicate the closed state of the main contact based on the output signal of the comparison means and the signal from the auxiliary switch that detects the opened / closed state of the main contact.

Description

technical field [0001] The present invention relates to a state monitoring device for monitoring an abnormal operating state of a circuit breaker for low voltage such as a circuit breaker for wiring or an earth leakage circuit breaker. Background technique [0002] The circuit breaker not only has the function of opening and closing the circuit by operating the operating handle of the circuit breaker, that is, the switch function, but also plays the following important role, that is, in order to prevent the wire or load equipment from being damaged due to the flow of overcurrent in advance. burnt and cut off the circuit. It is well known that such a circuit is cut off by, for example, responding to an overcurrent with a tripping device such as a thermal type or an electromagnetic type, and operating a switching mechanism by the tripping device. In addition, a so-called current limiting structure is known, which utilizes the electromagnetic reaction generated between the fix...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01H33/00H01H31/02H02H3/04
CPCH02H3/093H02H3/04
Inventor 伏见征浩野村敏光
Owner MITSUBISHI ELECTRIC CORP
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