JPH0785768A - Earth leakage breaker - Google Patents

Abstract

PURPOSE:To save wiring space and simplify the wiring work. CONSTITUTION:A connecting conductive material 14 to be connected with a leakage detecting tripping circuit through a base plate 18 is formed on the mounting base 10 of a leakage tripping device 8, and a buried conductor 17A to be connected to a lead wire and a through conductor connected to the base plate 17 and a movable contact base is formed on a bottom lid 17. Since the positions of the buried conductor 17A and the connecting conductive material 14 are fixed, compared with a one using a soft lead wire as in a conventional technique, the space necessary for wiring can be saved by this portion.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an earth leakage breaker for detecting an earth leakage and opening a main contact, and more particularly to an earth leakage breaker using a through conductor inserted through a zero-phase current transformer.

[0002]

2. Description of the Related Art As a prior art of an earth leakage circuit breaker, Japanese Patent Laid-Open No.
There is a technique disclosed in Japanese Patent Laid-Open No. 110735. In this conventional technique, a board on which a leakage detection and trip circuit unit that detects and outputs a leakage current to a leakage trip device is mounted, and a main circuit, a zero-phase current transformer, and a leakage trip device each have a lead wire and a lead wire. And the lead wire is exposed in the space inside the case. Another conventional technique is shown in FIG. Although not shown in detail in the prior art shown in the figure, the board 18 on which the leakage detection trip circuit portion is mounted, the leakage trip device 8 and the zero-phase current transformer 6 are connected by lead wires, and The penetrating conductor 3 that passes through the zero-phase current transformer 6 is also connected to the lead wire. Further, a lead wire is also connected between the leakage test switch unit 13 provided in the leakage trip device and the component to be connected thereto.

[0003]

However, none of the above-mentioned prior arts considers the following points. That is, although a lead wire is used to connect the substrate 18 of the earth leakage detection trip circuit portion, the earth leakage trip device 8 and the zero-phase current transformer 6, the lead wire is flexible and its position is not fixed. Absent. Therefore, it is necessary to take an extra wiring space for the lead wire, which causes a problem that the wiring space cannot be saved. Moreover, since a large number of lead wires are used, there are problems that the number of parts is large, the connecting work is troublesome, and the assembling property is deteriorated.
Further, there is a problem that when the main contact of the lead wire is opened by the trip operation, metal melt, carbon or the like is scattered from the main contact and adheres to the lead wire, and the coating of the lead wire is damaged. In order to prevent the lead wire from being damaged, the lead wire must be provided with another component that can withstand the scattering of the metal melt and carbon, which causes a problem of further increasing the number of parts and the number of working steps.

An object of the present invention is to solve the above problems of the prior art, to save the wiring space, to simplify the wiring work, and to provide an earth leakage breaker which can improve the reliability of the connection. is there.

[0005]

SUMMARY OF THE INVENTION In the present invention, a mounting base for an earth leakage trip device is formed of a mold resin so that an operating time changeover switch, an earth leakage test switch and a trip actuator can be stored in the mounting base. On the other hand, an operating time changeover switch, an earth leakage test switch, and a trip actuator housed in this are embedded with a wiring conductive material whose one end is connected, and the wiring conductive material is a board of the leakage detection tripping circuit section of the mounting base. When attached to
The present invention is characterized in that the leakage detection trip circuit section and the leakage trip device are connected.

[0006]

In the present invention, since the connecting conductive material for connecting to the leakage detecting and tripping circuit portion is formed on the mount of the leakage trip device, the wiring position is fixed by the connecting conductive material. The space required for wiring can be saved by that much as compared with the technology using flexible lead wires. In addition to this, since there is no need to use lead wires as in the past, it is possible to reduce the number of parts by that amount, and moreover, when metal melt or carbon etc. is scattered by the trip operation of the main contact, it becomes a conductive material for connection. Since there is no risk of adhesion, even if a leakage trip device, a board, etc. are placed near the main contact, there is no need to worry about them, and it is no longer necessary to use a separate part, and the number of parts is even greater. It can be reduced.
Further, since the connecting work can be performed by assembling the connecting parts together, not only the connecting work is facilitated, but also the connection can be performed accurately in a stable state, so that the withstand voltage performance is stabilized. be able to.

[0007]

Embodiments of the present invention will be described below with reference to FIGS. 1 to 5 show a first embodiment of an earth leakage breaker according to the present invention. The earth leakage breaker of the embodiment is shown in FIG.
As shown in (a) and (b), the case 16 and the cover 15
A main contact is provided in the space defined by and. The main contact is formed by a fixed contact 52 provided on the fixed contact base 51 and a movable contact 54 provided on the movable contact base 53. As shown in FIG. 3B, the movable contact 54 becomes the fixed contact 52. By making contact with each other, the main circuit is closed.
In this example, since it is an earth leakage breaker for three phases, three main contacts are installed. As shown in FIGS. 2 and 3, the power source side terminal 1 is provided at one end of the fixed contact base 51, and the lead wire 22, the overcurrent trip relay 4, the through conductor 3 and the like are provided at one end of the movable contact base 53. It is connected to the load side terminal 5 via the. As shown in FIGS. 2 and 3, the overcurrent trip relay 4 is connected to the movable contact base 53 via the lead wire 22,
When an overcurrent flows in the main circuit, it is detected and excited, and the latch 2a of the open / close trip mechanism 2 is attracted. When the latch 2a is attracted to the overcurrent trip relay 4, the open / close trip mechanism 2 disengages the movable link base 53 from the fixed contact base 51 due to the collapse of the toggle link portion,
As a result, the main contact is opened, and when in the opened state, the operation handle 9 is operated to move the movable contact base 53 to the fixed contact base 51 side via the toggle link portion, thereby closing the main contact. The main contact can be opened and closed by operating the operation handle 9. As shown in FIG. 2, the zero-phase current transformer 6 is inserted into the through conductor 3 connected to the overcurrent trip relay 4 and is also connected to the leakage detection trip circuit section 7. The earth leakage detection and trip circuit unit 7 is connected to the main circuit and the earth leakage trip device 8, detects the earth leakage occurring in the main circuit based on the output from the zero-phase current transformer 6 and operates the earth trip device 8. . When the leakage detection trip circuit unit 7 detects leakage, the leakage trip device 8
The latch portion of the open / close trip mechanism 2 is released, and the toggle link portion collapses as in the trip operation, thereby opening the main contact. On the other hand, the main contact is arranged in the space defined by the case 16 and the cover 15,
As shown in FIG. 3B, the earth leakage trip device 8 is arranged. As shown in FIG. 4, the earth leakage trip device 8 is
The trip actuator 11 is placed at a predetermined position on the mount 10.
Each of them has an operating time changeover switch 12, an earth leakage test switch 13 and the like. Therefore, the mounting base 10 is formed so as to be able to store the components 11 to 13 described above. The mounting base 10 is molded with resin, and when the trip actuator 11, the operation time changeover switch 12, and the earth leakage test switch 13 are incorporated, the connecting conductive material 14 connected to them is embedded. That is, the conductive material 14 for connection is the mold resin A that forms the mounting base 10.
, One end of which is wired at a position to be connected to the trip actuator 11, the operation time changeover switch 12, and the earth leakage test switch 13 in the mounting base 10, and the other end is connected to a connecting portion 14A provided at the lower end of the mounting base 10. It is connected. More specifically, for example, as shown in FIG. 5A, the connecting conductive material 14 has a recess B formed at a wiring portion of the mounting base 10, and the recess B is filled with an insulating material C such as silicon. The wires are wired in the respective states. Alternatively, as shown in FIG. 5B, when the mounting base 10 is molded, the conductive material 14 for connection is set in the mold in advance, and then the molding resin A of the mounting base 10 is injected to conduct the conductive material for connection. The material 14 is formed integrally with the mount 10. The trip actuator 11 is operated to trip the open / close trip mechanism 2 when the leak detection trip circuit section 7 detects a leak. The operation time changeover switch 12 switches and sets the time when the trip actuator 11 operates. On the other hand, a bottom cover 17 is attached to the bottom of the case 16 as shown in FIGS. 1 and 3 (b), and a substrate 18 of the leakage detection trip circuit unit 7 is installed inside the bottom cover 17. As shown in FIG. 1, the board 18 is mounted with various electronic parts constituting the earth leakage trip circuit portion 7. When the mounting base 10 of the earth leakage trip device 8 is incorporated, the earth leakage trip device 8 and the earth leakage detection trip circuit. The portion 7 is connected by the conductive material 14 for connection. Therefore, the mount 1 is mounted on the board 18.
0 is incorporated, the connecting conductive material 14 of the mounting base 10
A connector hole 18A for inserting the connection portion 14A is provided. An embedded conductor 17A is embedded in the bottom lid 17. The embedded conductor 17A is formed so as to be connected to the substrate 18 and the zero-phase current transformer 6 when they are installed. The bottom lid 1 having the buried conductor 17A
7 is made of a molding resin similarly to the mount 10, the case 16 and the cover 15, so that the embedded conductor 17A
Is formed in the same manner as in the case of 14A of the mounting base 10, as shown in FIG.
Since it is formed as shown in (a) or (b), its description is omitted here. Further, as shown in FIG. 1, a connection portion 17B is provided at a predetermined position of the bottom cover 17 and is pulled out from a part of the embedded conductor 17A. Although not shown in detail, three connection portions 17B are provided corresponding to the three phases, and one end 3A of the through conductor and the movable contact base 53 are connected by the connection screw 19 tightened from the bottom portion of the bottom lid 17. One end of the lead wire 22 connected to is connected to each other. Therefore, when the earth leakage trip device 8 is installed in the board 18, the connection screw 19 removes the earth contact from the movable contact base 53, the lead wire 22, the through conductor 3, the earth leakage detection trip circuit portion 7, and the board 18. It will be connected to the device 8. An overcurrent trip relay 4 is connected to the other end 3B of the through conductor 3 with a screw.

In the earth leakage circuit breaker of the embodiment, as described above, the connecting conductive material 14 is embedded in the mounting base 10 of the earth leakage trip device 8, and when the mounting base 10 is incorporated into the board 18, the connecting conductive material 14 is inserted. By inserting the connection portion 14A of the above into the connector hole A of the substrate 18, the earth leakage trip device 8 and the earth leakage detection trip circuit portion 7 are connected. Further, a buried conductor 17A is provided on the bottom lid 17, and when the substrate 18 and the zero-phase current transformer 6 are installed on this, the earth leakage detection trip circuit unit 7 and the zero-phase current transformer can be connected. And when in that state,
Connection part 17B provided in a part of the buried conductor 17A of the bottom lid 17.
On the other hand, when the tip of the lead wire 22 connected to the movable contact base 53 and the one end 3A of the through conductor 3 are tightened with the connection screw 19, the movable contact base 53, the lead wire 22, and the through conductor 3 are connected by the connection screw 19. It is possible to connect the substrate 18 of the leakage detection and trip circuit unit 7 and the leakage trip device 8. Therefore, the conductive material 14 for connection that connects to the earth leakage detection and trip circuit 7 through the board 18 is formed on the mounting base 10 of the earth leakage trip device 8, while the board 18 and the movable contact stand 53 are arranged on the bottom cover 17. Since the embedded conductor 17A connected to the lead wire 22 and the penetrating conductor 3 connected to each other is formed and the wiring positions of both the embedded conductor 17A and the conductive material 14 for connection are fixed, it is flexible as in the prior art. The space required for wiring can be saved as much as compared with the one using a flexible lead wire. In addition to this, there are advantages described below. That is, since the lead wire used in the prior art is not used, the number of parts can be reduced and the assemblability can be improved. Moreover, when the metal melt, carbon, or the like is scattered by the trip operation of the main contact, there is no possibility of adhering to the conductive material for connection 14 or the buried conductor 17A. Therefore, the earth leakage trip device 8, the board 8 or the like is provided in the vicinity of the main contact. Even if it is arranged, there is no need to be concerned with it, and it is not necessary to use a separate part, so that it is possible to further reduce the number of parts and improve the assemblability. Further, since the connecting work can be performed by assembling the connecting parts together, not only the connecting work is facilitated, but also the connection can be performed accurately in a stable state, so that the withstand voltage performance is stabilized. be able to.

Next, the mounting base 10 for the earth leakage trip device 8,
A connection example between the molded resin body 40 provided with the wiring conductive material 14 and the embedded conductor 17A like the bottom cover 17 and the connection component electrically connected thereto will be described with reference to FIG.
In FIG. 6A, the wiring conductive material 140 is embedded in the mold resin body 40, and the mold embedded conductive material 23 and the lead wire 24, which are, for example, other connecting parts, are provided at predetermined positions of the wiring conductive material 140. , The contact part 25 is inserted,
Moreover, the solder 26 is connected from above. In this case, not only the solder 26 but also the mold-embedded conductive material 2
3, the recesses 41 are provided in the mold resin body 40 so that the respective tips of the lead wires 24 and the contact portions 25 are not exposed to the outside from the mold resin body 40, and the size of each recess 41 can be adjusted. Are formed to be small and have the same dimensions. Further, a connection protection plate 42 is mounted on the top of the molded resin body 40, and the protection plate 42 prevents the metal melt, carbon, and the like scattered during the trip operation from adhering to any of the connection parts. Therefore, the molded resin body 4
Even if the connecting portion between 0 and the connecting component is located in the vicinity of the main contact, the adhesion of carbon or the like can be reliably prevented.

In FIG. 6B, the wiring conductive material 14 is used.
0 is obtained by crimping the mold-embedded conductive material 23, the lead wire 24, and the contact portion 25 using the caulking member 27, and the mold-embedded conductive material 23 is connected to the wiring conductive material 140 so as to overlap. In FIG. 6C, the mold-embedded conductive material 23 and the contact part 25 are used, and the part 23 ′ of the inter-mold embedded conductive material 23 and the part 25 ′ of the contact part 25.
And are respectively engaged with the molded resin body 40 by engaging in a hollow shape. The conductive material 140 for wiring of the molded resin body 40 is a plug-in type connector portion 1 at a connection portion between the molded embedded conductive material 23 and the contact portion 25.
41 and 142 are formed, and the mold-embedded conductive material 23 and the contact portion 25 are inserted into the connector portion. At that time, when it is inserted, the component 2 is attached to the molded resin body 40.
3'and 25 'are installed by loosely engaging. Also in these FIGS. 6B and 6C, the caulking 27 and the connector portions 141 and 142 are the molded resin body 40.
Since it is not exposed to the outside from the above and the connection protection plate 42 is used, the same effect as in FIG. 6A is obtained. In particular, if there is a loose engagement as shown in FIG. 6 (c),
The connection of the mold-embedded conductive material 23 and the contact portion 25 to the wiring conductive material 140 is ensured, and reliability against vibration and the like is obtained.

The internal structures of the leakage test switch 13 and the operation time changeover switch 12 mounted on the leakage trip device 8 will be described with reference to FIG. In the earth leakage test switch 13 in FIG. 7A, the test button 131 is supported so as to urge the support wall 132 upward, and the movable contact 134 and the fixed contact 135 are provided on the contact stand 133 below the test stand 131. When the test button 131 is pressed, the movable contact 134 is pressed and comes into contact with the fixed contact 135, so that the test function is turned on. Figure 7 (b)
In the operation time changeover switch 12 in, the first, second, and third contacts 122 to 124 are embedded on the surface of the contact plate 121, and the changeover knob 125 that can move between the contacts 122 to 124 has the upper wall 126. The hole is protruding. A contact piece 127 is fixed to the bottom of the switching knob 125, and when the switching knob 125 is selectively operated in one of the directions, the contact piece 127 becomes the contact points 122 and 123 or the contact point 1.
23 and 124 are brought into contact with each other, whereby the operation time is switched.

FIG. 8 shows a second embodiment of the earth leakage breaker according to the present invention. In this case, the earth leakage removing device 8 is arranged on the lower side of the case 16, and the earth leakage removing device 8 is provided.
The mounting base 10 is incorporated into the board 18 of the earth leakage detection trip circuit portion 7 arranged at an upper position in the case 16 so that the earth leakage detection trip circuit portion 7 and the earth leakage trip device 8 are connected to each other. I have to. Therefore, the mounting base 1
Although not shown in detail in FIG. 0, a connection conductor for connecting to the trip actuator, the operation time changeover switch, and the earth leakage test switch is embedded, and the upper end of the connection conductor is inserted into the connector hole 18 of the substrate 18. A connecting portion 14A is provided. Further, in the case 16, first and second embedded conductors 171 and 172 that can connect the zero-phase current transformer 6, the substrate 18, and the load-side terminal 5 are provided, respectively. One end of the first buried conductor 171 is connected to the substrate 18 in the case 16, and the other end is shaped so that the connector 6A of the zero-phase current transformer 6 can be inserted therein. The second buried conductor 172 has one end connected to the substrate 18 and the other end extended to a position corresponding to the load-side terminal 5 in the case 16. Further, an accommodating component 30 capable of accommodating both the zero-phase current transformer 6 and the through conductor 3 inserted therethrough is formed. The housing component 30 is formed of an insulating mold resin similarly to the case 16, and when both the zero-phase current transformer 6 and the through conductor 3 are housed, the through conductor 3 for each phase is surely secured to each other. The connector 6A of the zero-phase current transformer 6 is separated by the insulating wall so as to be insulated, and is further housed in the case 16 so that the first buried conductor 171
It is connected to the substrate 18 by being inserted into. Therefore, the zero-phase current transformer 6 incorporated in the housing component 30 is included in the housing component 30.
While the connector 6A is formed to project, the case 16 is formed with a groove in which the housing component 30 can be placed. Then, when the housing component 30 is assembled in the case 16, the case-side set screw 21 connects the load-side terminal 5 and the second embedded conductor 172 for each phase. The case set screw 21 is for attaching the load side terminal 5 to the case 16. Therefore, when the load side terminal 5 is attached, the both 5 and 172 are connected to each other. According to this embodiment, the leakage trip device 8 can be connected to the substrate 18 in the case 16 by connecting them, and the accommodating member 30 accommodating the zero-phase current transformer 6 and the through conductor 3 can be incorporated in the case 16. Since the zero-phase current transformer 6 can be connected to the substrate 18 by the first embedded conductor 171, it is possible to obtain substantially the same operational effect as the first embodiment provided with the wiring conductor 14 and the embedded conductor 17A. Further, when the load side terminal 5 is attached to the case 16 with the case set screw 21, the board 18 is connected to the main circuit via the second embedded conductor 172, so that the load side terminal 5 is attached and the main circuit and the board 18 are connected to each other. Both of them can be connected at the same time, which can improve the assembling workability. Further, not only the zero-phase current transformer 6 but also the penetrating conductor 3 is housed in the housing component 30 in a state where the penetrating conductor 3 is inserted therethrough, and furthermore, the penetrating conductor 3 is surely partitioned in an insulating state for each phase. Even if the metal melt or carbon scatters due to the trip operation, it is possible to suppress them from adhering to the through conductor 3 as much as possible.

[0013]

As described above, according to the present invention, by incorporating the earth leakage trip device in the board of the earth leakage detection trip circuit portion, the two are connected to each other, and the mold having the conductive material for wiring and the buried conductor is provided. Since the metal melt and carbon scattered by the trip operation are not attached to the connecting portion between the resin component and the component to be connected thereto, the following effects are obtained. 1) The withstand voltage performance between the substrate of the earth leakage detection and trip circuit portion, the earth leakage trip device and the connection portion of the zero-phase current transformer is improved, and the connection reliability is improved. 2) Since the lead wire is unnecessary, the wiring space can be omitted, the number of parts can be reduced, and the assemblability can be improved.

[Brief description of drawings]

FIG. 1 is an exploded perspective view of essential parts showing a first embodiment of an earth leakage circuit breaker according to the present invention.

FIG. 2 is a circuit diagram of an earth leakage breaker.

FIG. 3 is a plan view (a) with a cover removed showing an earth leakage circuit breaker and an overall vertical cross-sectional view.

FIG. 4 is an explanatory exploded perspective view showing an earth leakage trip device.

5A and 5B are an explanatory view when a conductive material for connection is embedded in a mounting base and an explanatory view when it is integrally molded.

FIG. 6 is an explanatory view showing various connection examples of a molded resin body and parts connected to the molded resin body.

FIG. 7 is an explanatory view showing a connection structure inside the earth leakage test switch (a) and an explanatory view showing a switch structure inside the operation time changeover switch (b).

FIG. 8 is an explanatory perspective view of a main part showing another embodiment of the earth leakage breaker according to the present invention.

FIG. 9 is a vertical sectional view (a) showing a configuration example of a conventional earth leakage breaker and a plan view (b) showing a state where a cover is removed.

[Explanation of symbols]

1 ... Power supply side terminal, 52, 54 ... Main contact, 2 ... Open / close trip mechanism, 3 ... Penetrating conductor, 4 ... Overcurrent trip relay, 5
... load side terminal, 6 ... zero-phase current transformer, 7 ... earth leakage detection trip circuit section, 18 ... earth leakage detection trip device substrate, 8 ... earth leakage trip device, 10 ... mounting base, 11 ... trip actuator, 12 … Operation time switch, 13… Leakage test switch, 14… Connecting conductive material, 14A… Connecting part, 1
5 ... Cover, 16 ... Case, 17 ... Bottom lid, 17A ... Embedded conductor.

Claims (2)

[Claims] 1. A main contact formed by a fixed contact and a movable contact, an overcurrent trip relay for detecting an overcurrent flowing through the main contact, an overcurrent trip relay, and an overcurrent formed in a space formed between a case and a cover by a molding resin. By the open / close trip mechanism that opens the main contact by the detection of the trip relay, the leak detection trip circuit section and the leak detection trip circuit section that detect the leak occurring between the main contacts through the zero-phase current transformer. In an earth leakage breaker, each of which has an earth leakage trip device that operates to trip the opening / closing mechanism, and the earth leakage trip device has an operation time changeover switch, an earth leakage test switch, and a trip actuator, the installation of the earth leakage trip device. Stand
The operating time changeover switch, the earth leakage test switch and the trip actuator are formed of a mold resin so that they can be housed, and one end of the operating time changeover switch, earth leakage test switch and trip actuator housed in the mounting base is connected. A conductive material for wiring is embedded, and the conductive material for wiring connects the leakage detection trip circuit and the leakage removal device when the mounting base is mounted on the board of the leakage detection trip circuit. And an earth leakage breaker. 2. The circuit board of the leakage detection trip circuit section,
The earth leakage according to claim 1, characterized in that the earth leakage is arranged on a bottom lid which is attached to the bottom portion of the case and is formed of a mold resin, and is connected to the through conductor by an embedded conductor embedded in the bottom lid. Circuit breaker.