KR20180062300A - Instantaneous trip device using electric leakage test circuit - Google Patents

Abstract

The present invention relates to an instantaneous trip device, and more particularly, to an instantaneous trip device using an electric leakage test circuit, which is implemented to operate in parallel by using an electric leakage test circuit to have the same scheme as the operation of pressing a test button of a leakage and wiring breaker. According to the present invention, the instantaneous trip device of a wiring breaker, which has an electronic circuit unit including an operation handle, a fixed contact and a movable contact connected or disconnected by the operation handle between a power source-side terminal and a load-side terminal to apply an electric power, a trip bar for tripping the operation handle to shut off power, a zero phase current transformer for detecting a leakage current, an arithmetic circuit for implementing a trip operation, and a test circuit part corresponding to the electric leakage test circuit, includes: an armature mounted on the operation handle; a fixed magnet coupled to the movable contact and pulling and coming into contact with the armature upon magnetization; and a return spring for providing a restoring force to allow the armature to rotate to a home position when the fixed magnet is not magnetized, wherein the test circuit part is configured to pass through the zero phase current transformer, and the test circuit part is connected to the armature by a wire.

Description

TECHNICAL FIELD [0001] The present invention relates to an instantaneous trip device using an electrical leak test circuit,

The present invention relates to an instantaneous trip device, and more particularly, to an instantaneous trip operation and an apparatus using an electric leakage test circuit which is implemented to operate in parallel by using a leakage test circuit of the same type as the operation of pressing a test button of an electric leakage and a circuit breaker.

Typical accidents that occur in electric wiring circuits using electricity can be classified into short-circuit, electric shock, overload, and short-circuit. First, the circuit breaker is a safety device designed to automatically detect when a fault current (overload, short circuit) occurs in an electric wiring circuit and to prevent an accident occurring in the electric wiring circuit and secondary spreading accident by quickly shutting off the electric circuit. Although the fuse has the same function as the fuse, there is an inconvenience of replacing the fuse after the car end once. However, in the case of the wire breaker, it is advantageous that the fuse can be repeatedly used without malfunction or burnout. Secondly, the earth leakage breaker is a safety device designed to automatically detect when there is a leakage fault (short circuit, ground fault, electric shock) in an electric wiring circuit and to prevent the accident caused by a short circuit by blocking the converter quickly.

In general, the circuit breaker is mechanically operated based on the electric and magnetic operation using the mechanism. The leakage detection function of the earth leakage breaker is a function of detecting an electric current of several mA Electronic) circuits based on the operation. That is, in the case of a wire breaker, it can be used at any voltage below the operating voltage. Especially, the operation of the circuit breaker depends on the current size rather than the size of the voltage. When the reference leakage current is detected in the state that the rated operating voltage is necessarily maintained, the vehicle is operated at a value greater than the set value.

 The domestic earth leakage circuit breaker is specified to use only the earth leakage circuit breaker that combines the earth leakage protection function and the overload (overcurrent), which is the main function of the wiring breaker, and the short circuit protection function. The electronic circuit must be included.

 In such a circuit breaker, when the rated current (usually indicated in the circuit breaker case or breaker opening) flows, the breaker is in the ON position, while if the overcurrent flows in the circuit, the trip device operates, Trip to the OFF position to shut off the circuit.

Trip refers to an operation in which a circuit breaker detects an abnormal current in a circuit breaker and automatically cuts off the power. The tripping operation is usually carried out by a thermal coin type (thermoelectric type) using fixed and movable iron cores, in addition to a thermal type (thermo type) and thermal type function using bending characteristics of bimetal according to a method of tripping a breaker, (Full electromagnetic type) using a viscosity of a semiconductor element, an electronic type (electronic type) using a semiconductor element, and the like are known.

In general, the open-close mechanism, the stationary contactor, the movable contactor which can be brought into contact with or separated from the stationary contactor, the trip bar connected to the open / close mechanism and capable of tripping the open / close mechanism, A bimetal for bending the trip bar when the overcurrent flows through the circuit, and a fixed magnet for magnetizing the electromagnetic force generated by the current flowing in the converter inside the bimetal or the breaker.

When the overcurrent flows in the circuit, the wire breaker including the instantaneous trip device increases the magnetic flux density of the fixed magnet to serve as a magnet and attract the surrounding metal. The movable contact is separated from the fixed contact and the opening / closing mechanism is moved to the OFF position by the force of pushing the trip bar due to bending of the bimetal and the pushing force of the trip bar by the instantaneous trip device. The cut-off speed is much faster and more reliable than that of the electronic circuit breaker.

In other words, when the opening / closing mechanism is in the OFF position, the fixed contact and the movable contact are not in contact with each other and electricity can not be used through the load side. On the other hand, And flows to the load side. The bimetal that curves in accordance with the flowing current can not trip the ON-state switching mechanism by pushing the trip bar in a state where the degree of bending is less than the rated current of the circuit breaker. This is because when the opening and closing mechanism is in the ON position, the lever is restrained to the trip bar, and the tripping mechanism can not be released by pushing the trip bar toward the load side.

When the overcurrent which is higher than the rated current flows, the bimetal is bent a lot, thereby pushing the trip bar to release the levers, so that the opening / closing mechanism moves to the OFF position and the fixed contact and the movable contact are separated and the electrical connection is broken.

The overcurrent can be generally referred to as being several tens to several hundreds of the rated current, slightly exceeding the rated current, but the overcurrent is usually 1.25 to 5 times the overcurrent; 8 ~ 20 times over current instantaneous current; And an overcurrent of 20 times or more is referred to as a short-circuit current or short-circuit current.

Especially when the overcurrent is not very large, for example, when the instantaneous current flows, the speed of the bimetal bending is slow, and it takes time to push the trip bar to trip, which sometimes leads to an accident due to a long tripping time.

In particular, in order to satisfy various instantaneous currents in a small breaker air flow, it is difficult to provide a mechanism for tripping in response to a spatial restriction and a small amount of current, and there is also a limit to the electromagnetic force of a thermal coin.

Therefore, it is necessary to develop an instantaneous trip device with a high response speed even in an overcurrent such as an instantaneous current, which is not a very complicated simple method.

Registration Utility Model No. 20-0266485 (Registered Date: Feb. 18, 2002)

The present invention has been made to solve the above-mentioned problems,

It is an object of the present invention to provide an instantaneous trip device which can realize a trip operation in a simple manner even under an instantaneous current and has a very high response speed.

It is to be understood that the objects of the present invention are not limited to the above-mentioned objects, and other objects not mentioned can be understood by those skilled in the art to which the present invention belongs .

The features of the present invention for achieving the objects of the present invention as described above and performing the characteristic functions of the present invention described below are as follows.

The instantaneous trip device according to the present invention comprises an operation handle, a fixed contact and a movable contact which are brought into contact or separated by an operation handle between a power source side terminal and a load side terminal for energization, a trip bar for tripping the operation handle by tripping the operation handle, An instantaneous trip device for a leakage current and a circuit breaker including an electronic circuit part including a video current transformer for detecting a current, an arithmetic circuit for implementing a trip operation, and a test circuit part corresponding to a leakage test circuit, Amateur; A fixed magnet coupled to the movable contactor for attracting the armature when magnetized; And a return spring for providing a restoring force to rotate the armature in an in-situ state when the fixed magnet is non-magnetized, wherein the test circuit portion is configured to penetrate the image deflector, and the test circuit portion is connected to the armature by a wire .

Advantageously, the test circuitry comprises a test plate for implementation of a leakage test circuit condition, said amateur being connected in parallel to the test plate.

Preferably, the electronic circuit unit includes a bobbin to which a leakage trip coil for trip operation is wound, and a movable core configured to pull the trip bar when a leakage current is sensed is assembled to the bobbin.

Preferably, the operation handle is formed with a pivot point for pivotal movement, and the pivot point includes an operation handle pin protruding in a lateral direction of the operation handle and assembled with the armature.

According to the instantaneous trip device using the leakage test circuit of the present invention, the instantaneous trip device that can realize the trip operation in a simple manner even under the instantaneous current, Lt; / RTI >

The effects of the present invention are not limited to those described above, and other effects not mentioned may be clearly recognized by those skilled in the art from the following description.

1 shows an internal view of a leakage and wiring breaker having an instantaneous trip device,
Fig. 2 shows a state in which a part of the base is removed, in a non-energized state of a leakage and wiring breaker having an instantaneous trip device,
Fig. 3 shows a state in which a part of the base is removed as a current-carrying state of the electrical leakage and wiring breaker provided with the instantaneous trip device,
Fig. 4 shows a state where the trip bar of the electric leakage and wiring breaker having the instantaneous trip device is tripped,
5 shows a perspective view of a leakage and wiring breaker having an instantaneous trip device,
6 shows an electrical leak test circuit used in a leakage and wiring breaker having an instantaneous trip device,
7 shows an instantaneous trip device using a leakage test circuit according to a preferred embodiment of the present invention.
8 and 9 show an instantaneous trip device using a leakage test circuit according to another embodiment of the present invention.

The specific structure or functional description presented in the embodiment of the present invention is merely illustrative for the purpose of illustrating an embodiment according to the concept of the present invention, and embodiments according to the concept of the present invention can be implemented in various forms. Also, it should be understood that the present invention should not be construed as limited to the embodiments described herein, but includes all modifications, equivalents, and alternatives falling within the spirit and scope of the present invention.

Meanwhile, in the present invention, the terms first and / or second etc. may be used to describe various components, but the components are not limited to the terms. The terms may be referred to as a second element only for the purpose of distinguishing one element from another, for example, to the extent that it does not depart from the scope of the invention in accordance with the concept of the present invention, Similarly, the second component may also be referred to as the first component.

Whenever an element is referred to as being "connected" or "connected" to another element, it may be directly connected or connected to the other element, but it should be understood that other elements may be present in between something to do. On the other hand, when it is mentioned that an element is "directly connected" or "directly contacted" to another element, it should be understood that there are no other elements in between. Other expressions for describing the relationship between components, such as "between" and "between" or "adjacent to" and "directly adjacent to" should also be interpreted.

Like reference numerals designate like elements throughout the specification. It is to be understood that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. In the present specification, the singular form includes plural forms unless otherwise specified in the specification. &Quot; comprises "and / or" comprising ", as used herein, unless the recited element, step, operation, and / Or additions.

Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings. The present invention may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the scope of the invention to those skilled in the art. It is provided to let you know.

Fig. 1 shows an internal view of a leakage and wiring breaker having an instantaneous trip device, Fig. 2 shows a state in which a part of the base is removed, Fig. 4 shows a state in which the trip bar of the electric leakage and wiring breaker equipped with the instantaneous trip device is tripped, and Fig. Fig. 5 shows a perspective view of a leakage and wiring breaker having an instantaneous trip device, Fig. 6 shows an electric leakage test circuit used in a leakage and wiring breaker provided with a instantaneous trip device, Fig. 7 shows a preferred embodiment 1 shows an instantaneous trip device using an electric leakage test circuit according to an example. 8 and 9 show an instantaneous trip device using a leakage test circuit according to another embodiment of the present invention.

1, a leakage and wiring breaker 1 having an instantaneous trip device includes a power source side terminal 4 mounted on a base 2 and connected to a power source side, and a load side terminal 6).

2 to 3, a fixed contact 12 and a movable contact 14 are formed between the power source side terminal 4 and the load side terminal 6 for energizing or de-energizing. Further, an operation handle 20 is formed which can be operated so that the stationary contactor 12 and the movable contactor 14 can be contacted or separated for energization or de-energization.

2 shows the non-energized state of the power source side terminal 4 and the load side terminal 6 with the operating handle 20 in the OFF state. As described above, when the stationary contactor 12 and the movable contactor 14 are separated from each other, no current flows between the power source side and the load side terminals 4, 6.

3, the operation handle 20 is in the ON state, and the power supply side terminal 4 and the load side terminal 6 are energized. That is, when the stationary contactor 12 and the movable contactor 14 are in contact with each other, the power source side terminal 4 and the load side terminal 8 are turned on, and the power source side and the load side terminals 4 and 6 are energized .

2 and 3, a frame 8 for rotatably mounting the operation handle 20 is formed on the base 2 of the electric leakage and wiring breaker 1. As shown in Fig. The operation handle 20 is configured to be pivotally movable with respect to a pivot point formed on the operation handle itself. The pivot point may correspond to an operation handle pin 22 as shown in Figs. 2 to 4. The operation handle pin 22 is formed so as to protrude from the operation handle 20 in the transverse direction of the operation handle 20. It will be clearly understood by those skilled in the art that the operation handle pin 22 is shown in a cylindrical shape but is not limited to such a shape.

On the other hand, the frame 8 is formed with a hole concentric with the pivot point. The manipulation handle 20 is pivotally mounted on the frame 8 by the manipulation handle pin 22 so that the pivot point of the manipulation handle 20 coincides with the hole.

As shown in Figs. 2 and 3, the operation handle 20 can be operated to the ON position or the OFF position, which is the open / close position, according to the operation of the user. The operation handle 20 is connected to the lever 26 by a link member 24 formed on one side of the operation handle 20. [ The lever 26 is configured to move up and down according to the operation of the operation handle. The lever 26 also contacts the crossbar 28 formed below the lever 26 and pressed by the lever 26 to move up and down. The movable contactor 14 is located below the crossbar 28 so that the movable contactor 14 is brought into contact with or separated from the fixed contactor 12 by the vertical movement of the crossbar 28.

2, when the operating handle 20 is in the OFF state, the operating handle 20 causes one side of the lever 26 to ascend or upward, and the lever 26 to move the crossbar 28 So that the cross bar 28 is moved upwardly. The movable contactor 14 which is pressed by the crossbar 28 in accordance with the upward movement of the crossbar 28 is separated from the fixed contactor 12 so that the fixed contactor 12 and the movable contactor 14 are in the separated state, State.

3, when the operation handle 20 is turned on, the operation handle 20 causes one side of the lever 26 to move downward, and the lever 26 moves the crossbar 28 And pressurized. This causes the crossbar 28 to move down and thus the crossbar 28 causes the movable contact 14 to move downward to come into contact with the fixed contact 12. Thereby, the stationary contactor 12 and the movable contactor 14 are brought into contact with each other and are brought into a conductive state.

On the other hand, FIG. 4 shows a state in which the trip bar 30 is tripped. The trip bar 30 is a safety device that operates when an overcurrent or a short-circuit current flows in the circuit, and is installed to automatically cut off the circuit.

The leakage and wiring breaker 1 provided with the instantaneous trip device has a bimetal 40 connected to the movable contact 14, a fixed magnet 50 and an armature 60 .

The bimetal 40 is coupled to the upper surface of the movable contact 14 and trips the trip bar 30 by pushing the trip bar 30 curved and restrained by an electromagnetic force generated when an overcurrent flows in the circuit, .

The fixed magnet 50 is coupled to the upper surface of the bimetal 40 which engages the upper surface of the movable contact 14. The fixed magnet 50 is magnetized by the current flowing in the bimetal 40 only when a current flows, so that the fixed magnet 50 has a property of a magnet. In other words, when current flows around, it is magnetized to generate electromagnetic force. That is, when an overcurrent flows in the circuit, a magnetic force is generated in the fixed magnet 50 by the current flowing through the bimetal 40 and attracts the armature 60. At this time, the armature 60 and the fixed magnet 50 are brought into contact with each other through the operation handle pin 22 electrically connected to the armature 60 and the lead wire or lead wire 80 connected through the frame 8, 76 in the same manner as the function of pressing the leak test button through the portion of the lead wire 80 connected to the earth fault coil 76. The sensor current sensor 72 detects the current flow in the leakage test circuit, The other side of the lever 26 which has been restrained by the trip bar 30 is released through the above process and the operation handle 20 ) To the OFF position, the circuit is cut off.

An armature 60 is connected to the operation handle pin 22 of the operation handle 20 for instantaneous tripping. Between the armature 60 and the frame 8 coupled to the manipulating handle pin 22 is formed a return spring for turning and returning to the manipulating handle pin 22 of the armature 60.

When a current does not flow or a current of a rated current or a current of a predetermined current or less (for example, about six times the rated current) flows, the return spring having a preset resistance force resists, (50). On the other hand, when the overcurrent flows (for example, about 10 times the rated current), the armature 60 immediately contacts the stationary magnet 50 because the strength of the magnetic force exceeds the resistance of the preset return spring.

In particular, according to the present invention, the armature 60 comprises a face coupled to the operating pin 22 and a plate-like face, as best seen in Figure 2, Has a first surface extending from the plate-shaped surface opposite to the fixed magnet (50), and a second surface curved upwardly from the first surface and extending upward. That is, the surface of the armature 60, which is in contact with the stationary magnet 50, may be formed in a shape that is rotated by 90 degrees in the counterclockwise direction of the U shape or the U shape. This keeps the crossbar 28 spaced even during non-demagnetization.

Referring to Fig. 5, the electric leakage and wiring breaker 1 includes an electronic circuit portion 70 which controls an electric leakage current, which is usually composed of a printed circuit board. The electronic circuit unit 70 includes a zero current transformer (ZCT) 72 as a sensor for detecting a short circuit and a short circuit trip coil (not shown) for providing a pulling force to the trip bar 30 and being wound on a bobbin 74). When the movable core 75 is pulled toward the electric leakage trip coil 74 side by the movable core 75 having one side hanging inside the electric leakage trip coil 74 and the other side being hooked to the trip bar 30 The trip bar 30 is tripped.

The video deflector 72 detects the inflow current and the outflow current of the wire passing through the inside of the video deflector 72. When a short circuit occurs, a difference arises in the current flowing through the frame deflector 72, magnetization is effected corresponding to the difference, and the magnetic energy to be magnetized is transmitted through the wire wound inside the frame deflector 72 to an electric signal Respectively. The electric signal appearing at this time is a weak signal having only the magnitude of the signal and can not be used to push or pull the trip bar 30. [ In order to push or pull the trip bar 30, the signal of the video current transformer 72 is amplified. If it exceeds the predetermined value, the electronic circuit unit 70 calculates and pushes the trip bar by borrowing force from the AC power source.

On the other hand, in order to test the normal operation of the electric leakage and the circuit breaker, the circuit breaker is provided with a leakage test circuit. The leakage circuit is connected to the electronic circuit portion 70 at both ends of the AC power source, and the test circuit portion is constituted by the connected circuit. The test circuit portion includes a test resistor 76 formed apart from the test plate 76 and the test plate 76. A test button (not shown) is formed on a surface of a cover portion (not shown) that covers the upper side of the base 2 to generate a short circuit by pushing the test button. And comes into contact with the resistor 78. At this time, a current corresponding to a preset leakage current flows through the image deflector 72, and the image current transformer 72 senses the generated current and generates a signal, so that a large current due to the AC power source is supplied to the earth fault coil 74 Flow. As a result, the electric leakage trip coil 74 pulls the movable core 75 of the trip bar 30, thereby causing the trip bar 30 to move to the trip position at the same time. The restraint with the lever 26 is released and the circuit breaker makes a non-conduction state.

Referring to Fig. 7, the present invention is applied to an electrical leak testing circuit among the electrical leakage circuits. The instantaneous trip device using the leakage test circuit according to the present invention includes a lead wire 80 connecting one side of the test plate 76 and the frame 8. [ In particular, the lead 80 may be connected in parallel with the test plate 76.

The lead wire 80 is connected to the frame 8 and part of the circuit power source is connected by an operation handle pin 22 to which the frame 8 is coupled and an armature 60 to be mounted on the operation handle pin 22. [ That is, the armature 60 can maintain the electric current with the operation handle 20. [ As described above, preferably, the trip spring of the armature 60 does not trip and the circuit breaker can maintain the ON state. However, according to another aspect of the present invention, as shown in Figs. 8 and 9, the lead wire 80 may be connected directly to the armature 60. Fig.

A test resistor 78 is connected to the other side of the test plate 76, and the other side of the power source is connected to the frame deflector 72.

According to one aspect of the present invention, the effect of pressing the test button of the electric leakage and the circuit breaker by controlling the armature 60 to be restrained by the return spring and preventing the armature 60 from rotating under a constant current, Thereby realizing the separation of the fixed contactor 12 and the movable contactor 14, thereby blocking the circuit breaker.

For example, in the case of an overcurrent of about 1.25 to 2 times the rated current, the armature 60 is controlled to be restrained by the return spring, and the armature 60 at the net plant constant current (for example, 8 times the rated current) When the electric current is more than 8 times, the armature 60 comes into contact with the fixed magnet 50 instantaneously to provide an effect of pressing the test button. Thereby, the converter is separated, and the breaker is shut off. The fixed magnet 50 is magnetized by the current flowing through the movable contactor 14 and the bimetal 40. When the current is higher than the specific current, the armature 60 overcomes the restraining force of the return spring, . A large current flows from the AC power source to the electric leak trip coil 74 so that the electric trip trip coil 74 is in contact with the fixed core 50 of the trip bar 30, 75, thereby causing the trip bar 30 to move to the trip position at the same time. Then, the restraint with the lever 26 is released, and the circuit breaker instantly produces the non-conduction state.

The instantaneous trip device using the leakage test circuit according to the present invention is characterized in that an instantaneous current through an amateur connected in parallel with a leakage current test circuit formed through a current transformer for detecting leakage current and a current transformer and a fixed magnet for inducing a switching operation When they flow, they come into contact with each other and function the same as pressing the leak test button.

It will be apparent to those skilled in the art that various modifications and variations can be made in the present invention without departing from the spirit or scope of the inventions. It will be apparent to those of ordinary skill in the art.

1: Leakage and wiring breaker with instantaneous trip device
2: Base
4: Power side terminal 6: Load side terminal
8: Frame 12: Fixed contact
14: movable contactor 20: operation handle
22: operation handle pin 24: link member
26: lever 28: crossbar
30: trip bar 40: bimetal
50: Fixed Magnet 60: Amateur
70: Electronic circuit part 72: Video current transformer
74: Leakage trip coil 75: Movable core
76: test plate 78: test resistance
80: lead

Claims (5)

An operation handle, a stationary contactor and a movable contact which are brought into contact with or separated from each other by an operation handle between a power source side terminal and a load side terminal for energization, a trip bar for tripping the operation handle by tripping the power source, 1. An instantaneous trip device for an electric leakage and wiring breaker including an electronic circuit portion including an operation circuit for implementing an operation and a test circuit portion corresponding to a leakage test circuit,
An armature mounted on the operation handle;
A fixed magnet coupled to the movable contact and attracting the armature when magnetized; And
And a return spring for providing a restoring force to rotate the armature in place when the fixed magnet is not magnetized,
Wherein the test circuit unit is configured to pass through the video current transformer, and the test circuit unit is connected to the armature by a lead wire.
The instantaneous trip device of claim 1, wherein the test circuitry comprises a test plate for implementation of an electrical leak test circuit condition, the amateur being connected in parallel to the test plate.
The instantaneous trip device according to claim 1, wherein the electronic circuit portion includes a bobbin to which a leakage trip coil for trip operation is wound, and a movable core configured to pull the trip bar when a leakage current is detected is assembled to the bobbin.
The system of claim 1, wherein the manipulation handle is provided with a pivot point for pivotal movement, the pivot point including an manipulation handle pin protruding in the transverse direction of the manipulation handle and assembled with the armature, Device.
The armature according to claim 1, wherein the armature includes a first side extending in a direction opposite to the fixed magnet and a second side extending in a curved shape from the first side, the side contacting the fixed magnet, The instantaneous trip device.

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