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Circuit breaker

A circuit breaker and circuit technology, applied in the field of circuit breakers to prevent failures

Inactive Publication Date: 2017-11-03
MITSUBISHI ELECTRIC CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] Therefore, depending on the type of circuit breaker, there is a problem that it is necessary to set a limit to suppress the use voltage to be lower than the voltage of the forward connection when used in the reverse connection, or to prohibit the use in the reverse connection. limit

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment approach 1

[0018] figure 1 It is a block diagram showing the structure of the circuit breaker 100 in Embodiment 1 of the present invention, figure 2 is a block diagram showing the configuration of the overcurrent trip circuit 5, image 3 It is a flowchart showing the reverse connection detection operation of the overcurrent trip circuit 5 .

[0019] exist figure 1 Among them, the circuit breaker 100 is provided with: an opening and closing contact 2, which is composed of a fixed contact and a movable contact that is in contact with and separated from the fixed contact, and opens and closes the AC circuit 1; a converter 3, which has A 1-phase converter 3a inserted into the AC circuit 1, a 2-phase converter 3b inserted into the AC circuit 1, and a 3-phase converter 3c inserted into the AC circuit 1; The transformer 4a between the 1-2 phases of the circuit 1 and the transformer 4b between the 2-3 phases inserted into the AC circuit 1; the overcurrent tripping circuit 5, which is connect...

Embodiment approach 2

[0038] Figure 4 It is a block diagram showing the structure of the circuit breaker 200 in Embodiment 2 of this invention.

[0039] In the first embodiment, the transformer 4 is used as the voltage detector, but in this embodiment, the voltage dividing resistor 41 is used instead of the transformer 4 as the voltage detector.

[0040] In detail, the voltage dividing resistor 41 has: a resistor 41a, one end of which is connected to 1 of the AC circuit 1; a resistor 41b, one end of which is connected to the 2 of the AC circuit 1, and the other end is connected to the other end of the resistor 41a; resistor 41c , one end of which is connected to phase 2 of AC circuit 1; and a resistor 41d, one end of which is connected to phase 3 of AC circuit 1, and the other end is connected to the other end of resistor 41c.

[0041] Furthermore, the connection point of the resistor 41a and the resistor 41b and the connection point of the resistor 41c and the resistor 41d are connected to a dif...

Embodiment approach 3

[0048] Figure 5 It is a block diagram showing the structure of the circuit breaker 300 in Embodiment 3 of this invention.

[0049] Embodiment 1 shows an example in which the transformer 4 is provided, and when the line-to-line voltage between phases 1-2 and phase 2-3 of the AC circuit 1 exceeds a predetermined value and the auxiliary contact 7 is open, The overcurrent trip circuit 5 outputs a trip signal. On the other hand, when the power supply circuit driving the overcurrent trip circuit 5 is supplied from the line-to-line voltage of the AC circuit 1, it can be judged that the 1-2 phase of the AC circuit 1 is Or the line-to-line voltage between 2-3 phases is greater than the specified value.

[0050] Therefore, in the present embodiment, a control power supply circuit 9 is provided. The control power supply circuit 9 is provided in the AC circuit 1 and operates when the value of the line-to-line voltage of the AC circuit 1 exceeds a predetermined value (for example, AC50V...

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PUM

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Abstract

A circuit breaker can be obtained which can be used when a power supply side and a load side cannot be reversely connected, or can detect a connection state exceeding a limitation and achieve an open circuit so as to avoid faults caused by insulation deterioration when usable voltage is limited. The circuit breaker comprises an open / close contact that opens and closes an AC circuit; an converter that is provided in the AC circuit and detects a current flowing in the AC circuit; and an overcurrent trip circuit that outputs a trip-out signal based on a signal detected by the converter; a trip device that is energized by a trip signal and separates the open and close contacts; and an auxiliary contact that opens and closes in conjunction with the open and close contacts, wherein the overcurrent trip circuit also outputs the trip signal to the trip device when the auxiliary contact is open and the AC line voltage exceeds the specified value.

Description

technical field [0001] The present invention relates to a circuit breaker provided with an alarm device for converting a tripped state into an electric signal, and particularly relates to a circuit breaker whose use in reverse connection is limited. Background technique [0002] The circuit breaker is provided with: a power supply side terminal, which is connected to an AC circuit; a fixed contact, which is connected to the power supply side terminal; a movable contact, which is in contact with and separated from the fixed contact; One end is provided with the movable contact; a movable member holding part penetrating between the poles, which holds the movable contact freely rotatably; an overcurrent tripping device (for example, a trip coil), which is connected to the movable contact, If the current flowing through the circuit breaker exceeds a specified value, the switching mechanism is driven to rotate the movable member holding part and the movable contact, and the movab...

Claims

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Application Information

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IPC IPC(8): H01H83/10H02H3/08H02H11/00
CPCH01H83/10H02H3/08H02H11/002H01H83/04H01H83/20
Inventor 山崎晴彦
Owner MITSUBISHI ELECTRIC CORP