JPH0475227A - Circuit breaker - Google Patents

Abstract

PURPOSE:To instantaneously open a circuit against overcurrent and also automatically restore a linkage mechanism after heating into a state whereby the action of reclosing the circuit is possible by providing a linkage mechanism between a means for closing and opening the path between fixed contacts and an electromagnet for forcibly opening contacts during shortcircuit, and providing the linkage mechanism with functions of self retention and self restoration. CONSTITUTION:When a large current is generated in a main current path an electromagnet 30 for forcibly opening contacts during shortcircuit is instantaneously put in action to push a switching control lever 17 downward via a projecting bar 31 and a linkage mechanism so as to release a fixed contact 10 and a moveable contact 8. When the main current path is shut off the electromagnet 30 for forcibly opening contacts during shortcircuit is demagnetized and the projecting bar 31 returns to its upward position. In this case, the linkage mechanism keeps its position by itself while the contacts are released. When the switching control lever 17 is pushed down by a spring release mechanism which is actuated by the action of an overcurrent reacting device which has detected an overcurrent, a lever 113 is released into a powerless state so that the linkage mechanism is restored.

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Application Field] The present invention relates to a circuit breaker, and particularly to a circuit breaker having both circuit breaker function and electromagnetic switching function.

[Prior Art] Generally, circuit breakers are intended to protect electrical circuits and system equipment against overload currents or short circuit currents. When a load is frequently switched, an electromagnetic switch connected in series with a circuit breaker is installed, and the load is switched using the electromagnetic switch, which has long switching durability.

Conventionally, there are the following three types of prior art that integrate the functions of a circuit breaker and an electromagnetic switch.

The first type is disclosed, for example, in Japanese Patent Application Laid-Open No. 52-132382. This type integrally combines the functions of a circuit breaker and an electromagnetic switch, and has separate contacts for short-circuit breakers and load switches.

This type of device has excellent performance, but the device is large and uneconomical.

In addition, as a second type, for example, there is
There is something disclosed in Publication No. 3. This type has a structure in which an operating electromagnet and a contactor are mechanically connected to open and close a load, and when an overcurrent occurs, the connection between this mechanism is cut off. That is, this connection mechanism is of a trip-free type, and when the overcurrent tripping device operates, the operating electromagnet is opened and the connection is severed. Therefore, it is possible to perform high-speed shutoff. However, this trip-free one-way type has a complicated mechanism.
Furthermore, since the trip-free mechanism is operated at the same time as the opening/closing operation, it is not possible to obtain a product with good opening/closing durability.

Furthermore, as a third type, for example,
There is one disclosed in Publication No. 097.

This type has an operating electromagnet, a short-circuit protection electromagnet, and an overcurrent tripping device, and both the operating electromagnet and the short-circuit protection electromagnet act directly on the connecting means of the contact device. This method has excellent opening/closing durability. Furthermore, when interrupting a large current, the short-circuit protection electromagnet directly opens its contacts, and at the same time, an overcurrent tripping device operates to interrupt the excitation current of the operation electromagnet and deenergize it.

[Problems to be Solved by the Invention] However, in the third type of circuit breaker, when interrupting a large current, the contacts are first opened by the operation of the shorting electromagnet, and then the current is interrupted.

When the current is interrupted, the short-circuit protection electromagnet de-energizes and attempts to re-energize. However, a latch mechanism is provided to prevent this re-energization, and the re-energization is prevented. However, the latch mechanism according to this example does not have an automatic reset mechanism, and it is necessary to manually reset the latch mechanism in order to restart the circuit.

Therefore, this invention has been made to solve the above-mentioned problems, and is capable of instantaneously interrupting the circuit in response to excessive current, and automatically returning the circuit to a state in which the circuit can be restarted after the interruption is completed. It is an object of the present invention to provide a circuit breaker having a re-energization prevention mechanism that allows the circuit breaker to return to normal state.

[Means for Solving the Problems] A circuit breaker according to the present invention includes a movable contact provided with a fixed contact provided in the middle of a main current path, a movable contact that performs an opening/closing operation between the fixed contacts, and a movable contact. a first connecting means that engages with the movable contact to enable contact opening/closing operations of the movable contact; a second connecting means that simultaneously operates the first connecting means on multiple poles; and a second connecting means that is provided in the middle of the main current circuit to prevent overcurrent. It is equipped with an overcurrent response means that detects and responds, and a forced opening means in the event of a short circuit, and further,
The main current path includes at least one of a spring release mechanism and circuit opening/closing means for releasing the fixed contacts of the main current path.

The spring release mechanism includes a toggle link mechanism including a spring body, a lever disposed at one end of the link of the toggle link mechanism to actuate the second connecting means, and a response signal from the overcurrent response means transmitted to the toggle link mechanism. It is equipped with a latch mechanism that releases the spring body. When the spring body is in the energized state, the lever is moved to the second position where the movable contact can be contacted.
When the connecting means is maintained and the latch mechanism is actuated by a response signal from the overcurrent response means, the spring body is released and the second connecting means is moved to a position where the movable contact is opened.

The circuit opening/closing means has a movable part, a fixed part, and a release spring,
The movable part moves in response to an opening/closing command of the main current path, and includes a voltage-operated electromagnet that moves the second connecting means to a position where the movable contact is opened and opened by a release spring in a non-energized state.

The short-circuit forced opening means is provided in the middle of the main current path and operates in response to the occurrence of an excessive current of a predetermined value or more. - Between a current-operated electromagnet and this current-operated electromagnet and the first connection means. and a link mechanism that cooperates with the. The link mechanism moves the first connecting means in response to the operation of the current-operated electromagnet to open the movable contact and maintains the engaged state with the first connecting means. Further, the link mechanism maintains the engaged state with the first connecting means even after the current-operated electromagnet returns to the non-operating state. Furthermore, when either the spring release mechanism or the voltage-operated electromagnet is actuated to further move the first connecting means via the second connecting means to maintain the open state of the movable contact, the first The engagement with the connecting means is released and the device automatically returns to the standby state.

[Action] When a large current such as a short circuit current occurs, the electromagnet for forced opening in the event of a short circuit operates instantaneously, and the first connecting means moves the movable contact to the open position via the link mechanism, thereby opening the fixed contact. The gap between the fixed contacts is released to cut off the current, and the electromagnet for forced opening in the event of a short circuit returns to a non-operating state, but in this state, the link mechanism self-maintains its position with the fixed contacts released.

At the same time, the spring release mechanism operated by the overcurrent response means that detects the short-circuit current is activated, or the voltage-operated electromagnet is de-energized and the first connection means is restrained via the second connection means. Maintains the open state between fixed contacts. At this time, the first connecting means moves further in the releasing direction from the self-holding state, and the link mechanism that was self-holding returns to its original state and returns to a state in which it can be closed in response to a command.

Then, the forced opening electromagnet and the link mechanism linked thereto return to the state corresponding to the closed circuit state between the fixed contacts.

Embodiment FIG. 1 is an external perspective view of a three-pole type circuit breaker equipped with an overload short-circuit protection function according to an embodiment of the present invention. The housing of the circuit breaker includes a base 1, an operation mechanism unit housing 3, a tripping unit housing 4, and three independent opening/closing unit housings 2 and 6 for each pole.
It consists of two parts. Moreover, FIG. 15 is a circuit configuration block diagram showing a schematic configuration of the circuit breaker. Referring to FIG. 15, the circuit breaker has three independent main current paths, and each path has a disconnection contact DS,
An electromagnet ST for forced opening when the main contact S1 is short-circuited, a current transformer CT for current detection, and a zero-phase current transformer ZCT are provided. Three opening/closing means are provided as contact opening/closing means for opening/closing the main contact S. The first opening/closing means is a means for opening/closing the main contact S using an electromagnet 60 for opening/closing operation. The second disconnection means disconnects the main contact S by a spring release mechanism section 75b that operates in response to a detection signal from a current detection current transformer CT or a zero-phase current transformer ZCT provided in the main current path. It is something.

The third breaking means is a means for cutting off the main contact S by the operation of a forced opening electromagnet ST provided in the main current path. The structure of a circuit breaker having such a circuit configuration and mechanism will be described below.

2 is a sectional view of the center side of the circuit breaker shown in FIG. 1 in the closed state, and FIG. 3 is a plan view taken along the cutting line XX in FIG. 2.

Referring to both figures, the circuit breaker includes a hollow base 1 made of a molded insulator, an independent opening/closing unit housing 2 for each pole made of a molded insulator inserted from the bottom of the base 1, and a base. an operating mechanism unit housing 3 made of an insulator formed on one side of the upper part of the base 1;
A tripping unit housing 4 made of a molded insulator is attached to the other side of the upper part of the housing.

The opening/closing/blocking unit housing 2 has an elongated shape, and a disconnecting section 13 is connected from a power supply side terminal conductor 16 disposed at one end thereof.
A current path is configured to reach the first fixed conductor 12, the main contact portion 5, and the second fixed conductor 14 via the first fixed conductor 12. Main contact part 5
Arc extinguishing devices 7.7 are arranged on both sides. The main contact portion 5 includes a pair of fixed contacts 10.10 provided on the first fixed conductor 12 and the second fixed conductor 14, and a movable contact 8.8 at a position opposite to the fixed contacts 10.10. a bridging type movable contact 9 having a bridge-type movable contact 9; a contact spring 11 that supports the movable contact 9 from below and is always fixed; a contact spring 11 presses the movable contact 8 against the contact spring 11; The opening/closing operation lever 17 of the main contact portion 5 is operated by pushing down the opening/closing operation lever 17 to open the space between the fixed contact 10.10 and the movable contact 8.8.
Further, the return operation is performed by bringing the fixed contact 10 and the movable contact 8 into contact with each other due to the restoring force of the contact spring 11.

One end of the first fixed conductor 12 having one fixed contact 10 extends to the upper part of the arc extinguishing device 7 to form an arc horn, and the other end extends to the disconnecting section 13. The second fixed conductor 14 having the other fixed contact 10 has one end extended to the top of the arc extinguishing device 7 to form an arc horn, and the other end folded back to extend along the top of the housing 2. It is extended and exposed to the groove of the tripping unit housing 4 through the through hole of the base 1 .

In addition, the main contact 5 inside this opening/closing unit housing 2
A link mechanism 18 for forced opening in the event of a short circuit is provided near the top of the link mechanism 18 . This will be discussed later.

Further, the arc runner 15 provided along the bottom wall of the opening/closing unit housing 2 includes a first fixed conductor 12,
It is provided at the lower part of the arc extinguishing device 7.7 in correspondence with the arc runner section formed to extend toward the fixed contact 10.10 side of the second fixed conductor 14.

Inside the tripping unit housing 4, there are an electromagnet 30 for forced opening in the event of a short circuit, a zero-phase current transformer 40, and a current transformer 41 for current detection.
and a load-side terminal conductor 43, each of which is connected in series to constitute a main current path.

The electromagnet 30 for forced opening in the event of a short circuit is a plunger type electromagnet composed of a fixed iron core 32, a corresponding movable iron core 33, a return spring 34, a magnetic yoke 35, and an exciting coil 36. A protruding rod 31 is integrally attached to the movable iron core 33. The tip of the protruding rod 31 passes through a through hole provided in the tripping unit housing 4, the base 1, and the opening/closing blocking unit housing 2, and comes into contact with the first lever 110 of the link mechanism 18 for forced opening in the event of a short circuit. The input end of the excitation coil 36 is connected to the second fixed conductor 14 exposed at the top of the opening/closing unit housing 2 with a screw 2.
4, and the output conductor 39 is connected to one piece of the iron core 42 of the current detecting current transformer 41 by passing through the through hole of one zero-phase current transformer 40 for three poles provided as necessary. It is wound as the primary coil.

The lead-out end of the primary coil of the current detection current transformer 41 is connected to one end of the load-side terminal conductor 43. Current detection current transformer 4
A secondary coil 44 is wound around the other side of the iron core 42 of No. 1,
The lead-out wire of the secondary coil is connected to the input of an electronic overcurrent relay 45 disposed above the secondary coil.

With the above configuration, a main current path from the power supply side terminal conductor 16 to the load side terminal conductor 43 is configured.

Next, the configuration of the three separating means of the main contact 5 will be explained.

First, an electromagnet 60 for opening/closing operation is used as a first contact opening means.
A configuration using . Referring to FIGS. 2 to 4, the opening/closing electromagnet 60 is arranged in the operation mechanism unit housing 3 together with the operation control mechanism 75. As shown in FIGS.

The opening/closing electromagnet 60 is composed of an E-shaped fixed core 61, a corresponding E-shaped movable core 62, an excitation coil 63 and an attraction/release spring 64 that wind around the central leg of each core. Ru. Electromagnet 6 for opening/closing operation
The fixed core 61 of No. 0 is fixedly supported on the end cover 3a of the operating mechanism unit housing together with the fixed frame 65 by a plate spring 66 inserted into a narrow through-hole portion 61a provided on the fixed core 61. The movable core 62 is movably attached to the fixed frame 65 via a suction release spring 64 by a spring installation plate 69 that is integrally attached to the movable core 62 . The suction release spring 64 is a constantly movable iron core 62
is biased away from the fixed iron core 61. The movable iron core 62 has a structure that extends through the movable iron core 62 and
A movable core operating pin 73 that moves integrally with the movable iron core 2 is formed. Furthermore, an electromagnet operating lever 71 that engages with the movable core operating pin 73 is attached to one end of the fixed frame 65 so as to be rotatable about the pongee 72 . A cross spar 74 is attached to one end of the electromagnet operating lever 71.

The crossbar 74 is composed of an integrally molded body that simultaneously contacts the heads of the opening/closing operation levers 17.17.17 protruding from the three opening/closing blocking unit housings 2.2.2 arranged in parallel inside the base 1. ing.

Furthermore, regarding the second contact opening means, FIGS. 2 and 3v!
J1 will be explained with reference to FIGS. 5 and 6.

FIG. 5 is an enlarged plan view of a main part near the release type electromagnet 46 in FIG. 3. Further, FIG. 6 is a cross-sectional structural diagram taken along the cutting line Y-force direction in FIG. 2.

The second contact opening means passes from one end of the secondary coil 44 of the current detecting current transformer 41 to the electronic overcurrent relay 45 and the release type electromagnet 46, and further through the operation control mechanism 75 to form the three-pole interlocking crossbar 74. It consists of various devices. Referring to FIG. 5, the release type electromagnet 46 includes a U-shaped frame 47 made of a magnetic material, a permanent magnet 48 disposed within the U-shaped frame, and a tripping magnet 48 wound around one end of the U-shaped frame 47. It is composed of a coil 49, an armature 50, a support member 51 that rotatably supports the armature 50, and a tripping spring 52. In the release type electromagnet 46, the armature 50 is attracted and held by the leg of the U-shaped frame 47 against the acting force of the tripping spring 52 by the magnetic flux constantly applied by the permanent magnet 48. When an output signal from the electronic overcurrent relay 45 is input to the trip coil 49 in this state, a magnetic flux is generated in a direction that cancels the magnetic flux of the permanent magnet 48, and the armature 50 is separated from the legs of the U-shaped frame 47. do. One end of the armature 50 is in contact with a tripping transmission plate 54 that transmits the dissociation operation of the armature 50, and the other end of the tripping transmission plate 54 is further in contact with one end of the response transmission plate 103. The other end of the response transmission plate 103 is in contact with one end of the overload response trip actuation plate 102. The overload response trip actuating plate 102 performs rotational movement about the axis 1'01.

The other end of the lip actuating plate 102 in response to overload is
This corresponds to the secondary hook 99 of the operation control mechanism 75 shown in FIG. The transmission mechanism shown in FIG. 5 converts an excessive current detection signal generated in the main current path into a mechanical signal.

Next, the structure of the operation control mechanism 75 will be explained with reference to FIG. This operation control mechanism 75 is roughly divided into a handle mechanism section 75 operated by a control handle 79.
a, and a spring release mechanism section 75b for mechanically opening and closing the main contact. The handle mechanism section 75a includes a control handle 79, a camshaft 77 attached to the control handle 79, an eccentric cam 76 connected to the camshaft 77, and a slide plate 84 that is connected to the eccentric cam 76 and performs a sliding movement. including.

The control handle 79 is rotatably supported and rA
UTOJ, rTRI PJ, rOFFj, “RESET
It has six switching positions: J, rT E S TJ, rIsOLj. A cam groove 76a shown in FIGS. 7B, 9B, and 11B is formed on the lower surface of the eccentric cam 76, and the tip of the slide plate sliding pin 83 is inserted into this cam groove.

The slide plate sliding pin 83 passes through a linear guide hole provided in the fixed frame 80 and is caulked to one end of the slide plate 84. A portion of the slide plate 84 has an ear portion 84a bent into an inverted U shape. With this structure, when the control handle 79 is rotated, the rotational movement is converted into a linear movement of the slide plate 84 by the action of the eccentric cam 76.

The spring release mechanisms 75b each engage the secondary hooks 9 in the order in which they are engaged.
9. Primary hook 97, releasable lever 93, link 92
, link 90 and crossbar control lever 87. The bent piece 99a of the secondary hook 99 is provided at a position corresponding to one end of the overload responsive trip actuating plate 102, and receives the rotational movement of the overload responsive trip actuating plate 102. Further, the tip of the crossbar control lever 87 is in contact with the head 74a of the three-pole interlocking crossbar 74.

The secondary hook 99 is rotatably supported on the shaft 100, and one end is releasably butt-engaged with the upper end of the primary hook 97,
A bent piece 99a is provided at the other end. Primary hook 97
is rotatably supported on a shaft 98, and a clockwise rotational force is applied by a spring. Furthermore, a locking pin 97a is attached to the center of the primary hook 97 and is movable along the elongated hole. One end of the releasable lever 93 is rotatably supported by a shaft 96 fixed to the fixed frame 80, and a claw portion 93a at the other end is releasably engaged with a latching pin 97a of the primary hook 97. . A link 92 is rotatably connected to the upper end of the releasable lever 93 by a shaft 94.
are connected. The other end of the link 92 is connected to a link 90 via a toggle shaft 91, and one end of the link 90 is connected via 1Ii 189 to one end of a crossbar control lever 87 rotatably supported on the pongee 88. ing.

These two links 90, 92 and the toggle shaft 91 between them
An expansion spring 95 connected between the toggle shaft 91 and the top of the opening/closing control lever 86 constitutes a toggle link mechanism. The lower end of the opening/closing control lever 86 engages with a fixed bar 118 fixed to the fixed frame 80, and is rotatable about the fixed bar 118.

This opening/closing control lever 86 has a pin 84b provided at the tip of an ear portion 84a of the slide plate 84 slidably inserted into a groove portion 86a provided at the upper portion of both sides thereof. This connects the spring release mechanism 75b and the handle operation mechanism 75a.

This operation control mechanism 75 is a mechanism for operating the three-pole interlocking crossbar 74 by vertical movement of the crossbar control lever 87 to open and close the main contacts of the main current path, and has two command input systems as its operation command system. There is. One is a system in which a spring release mechanism 75b is operated by operating a handle 79 via a handle control mechanism 75a. In another system, the abnormal signal detected by the current detecting current transformer 41 is converted into a mechanical signal by the release type electromagnet 46, and then the secondary hook 99 is operated via the overload responsive trip actuating plate 102. It is a systematic.

Furthermore, the third contact separating means will be explained using FIG. 2. The protruding rods 31 of the electromagnets 30 for forced opening in the event of a short circuit arranged in series in the main current path come into contact with the first lever 110 of the link mechanism for forced opening in the event of a short circuit provided inside the opening/closing unit housing 2. ing. The first lever 110 is rotatably supported at its center by a rotating shaft 111.

The other end of the first lever 110 is connected to a link member 112,
A second lever 113 is connected to the other end of the link member 112. The second lever 113 has a substantially L-shape, and its central portion is rotatably supported by a shaft 114. The first lever 110, the link member 112, and the second lever 113 constitute a so-called dead center link mechanism. A return spring 115 is provided at one end of the first lever 110 to always bias the protrusion 31 of the electromagnet 30 for forced opening in the event of a short circuit in the direction of pushing back. Further, the tip of the second lever 113 is inserted into a hollow portion formed in the upper part of the opening/closing operation lever 17 of the main contact. The operation of the electromagnet 30 for forced opening in the event of a short circuit is such that the opening/closing operation lever 17 is moved via the link mechanism 18 for forced opening in the event of a short circuit by operating the protrusion 31 thereof.
The stationary contact 10 and the movable contact 8 are opened to interrupt the main current path.

Next, the contact opening/closing operation of the circuit breaker according to the present invention will be explained.

First, the contact opening/closing operation using the opening/closing operation electromagnet 60, which is the first opening/closing means, will be explained with reference to FIG.

The opening/closing electromagnet 60 operates in response to opening/closing commands from an ON10FF switch or the like provided outside the circuit breaker. When the excitation coil 63 of the opening/closing electromagnet 60 is de-energized in response to an external signal, the movable iron core 6
2 moves away from the fixed iron core 61 due to the restoring force of the suction release spring 64. According to this, the movable iron core 62
A movable core actuating pin 73 provided in the movable iron core actuating pin 73 rotates the electromagnet actuating lever 71 clockwise about a shaft 72. Then,
The cross bar 74 pushes down the opening/closing operation lever 17, and accordingly, the movable contact 8 and the fixed contact 1 of the movable contactor 9
0 is released. This breaks the circuit.

In addition, in the return operation, when the excitation coil 63 is energized again, the movable core 62 is attracted to the fixed core 61, and accordingly, the electromagnet operating lever 71, the crossbar 74, and the opening/closing operation lever 17 return to their original positions. .

Next, regarding the breaking operation of the main contact of the spring release mechanism which is the second opening means, FIGS. 2, 5, 7A, 7B, 8A, 8B, 9A, Figure 9B, Figure 10A
10B, 11A, 11B, 12A, and 12B. Here, FIGS. 7A, 9A, and 11A are plan views of the control handle, and FIGS. 7B, 9B, and 11B are planar structures showing the positional relationship between the eccentric cam and the slide plate 84. It is a diagram. Moreover, FIG. 8A, FIG. 10A, and FIG. 12A are cross-sectional structural views of the handle control mechanism section in each operating state. 8B, 10B and 12B respectively show the spring release mechanism portion 7 corresponding to the handle control mechanism described above.
5b is a cross-sectional structural diagram of FIG.

First, referring to FIGS. 7A to 8B, when the main current path of the circuit breaker is closed, the control handle 79
is at the rAUT, OJ, or rT E S TJ position, and the spring release mechanism 75b has the claw portion 93a of the releasable lever 93 engaged with the latching pin 97a of the primary hook 97, and -
The upper end of the secondary hook 97 and one end of the secondary hook 99 are in an engaged state. A toggle shaft 91 connecting the two toggle links 90 and 92 is in a tensioned state via the upper end of the opening/closing control lever 86 and an expansion spring 95, and the upper part of the link 92 is locked by the shaft 96. For this reason, the toggle links 90 and 92 are extended almost in a straight line, and one end of the crossbar control lever 87 is pushed down, and the side that contacts the three-pole interlocking cross spar 74 is pushed up, and the crossbar control lever 87 is pushed up and released from the interlocking pin 74a of the crossbar 74. It is in a separated state.

Now, when the control handle 79 is in the rAUTOJ position and the main contacts 8.10 are in the "on" state, an overload current flows in the main current path and receives the output signal of the electronic overcurrent relay 45. When the release type electromagnet 46 operates, the armature 50 opens, presses and slides the trip transmission plate 54 and the overload response transmission plate 103, further rotates the overload response trip operation plate 102, and The bent piece 99a formed at the end of the hook 99 is pressed and moved.

Referring to FIG. 10B, when the secondary hook 99 rotates clockwise about the shaft 100, the primary hook 97, which is disengaged from the secondary hook 99, rotates clockwise about the shaft 98. The latch pin 97a and the releasable lever 93
The engagement with is released.

The releasable lever 93 rotates counterclockwise about the shaft 96 and bends the toggle links 90 and 92 to release the crossbar.
Pull up one end of control lever 87.

Therefore, the crossbar control lever 87 rotates clockwise about the shaft 88 and the interlocking pin 74 of the crossbar 74 rotates clockwise.
Press down on a. When the crossbar 74 is pushed down,
Various operating levers 17.17 in contact with the crossbar 74
．． 17 is pushed down, the main contact is opened, and the state is "off". At this time, as the opening/closing control lever 86 is rotated, the slide plate 84 that engages with the bent lug 86a is slid, and the eccentric cam 76 and the control handle 79 are rotated, and the control handle 79 is moved to the indicated position of rTRIPJ. (See Figures 9A, 9B and 10A).

Also, with reference to FIGS. 11A to 12B, rTR
In order to return to the state where it can be opened and closed from the IPJ state,
By forcibly rotating the control handle 79 to the rRESETJ position, the opening/closing control lever 86 is rotated clockwise, and the pin 86 attached to one end of the opening/closing control lever 86 is rotated clockwise.
b to rotate the releasable lever 93 clockwise, the claw portion 93a of the releasable lever 93 engages with the latch pin 97a of the primary hook 97, and furthermore, the secondary hook 97 and the secondary hook 99 engage. return to the reset state. When the control handle 79 is released in this state, it automatically rotates to the designated position of rOFFJ, and furthermore, rAUT
To return to the OJ state, force the lever [
7A to 8 by returning to the AUTOJ position.
The state returns to the state shown in Figure B.

Next, the electromagnet 3 for forced opening at the time of short circuit, which is the opening means of the cabinet 3.
13A and 13B regarding the circuit breaking operation performed via the link mechanism 18 for forcibly opening at the time of zero and short circuit.
This will be explained using figures. FIG. 13A is a partially enlarged structural diagram showing a standby state of the link mechanism for forced opening in the event of a short circuit, and FIG. 13B is a partially enlarged sectional view showing the operating state.

Referring to FIG. 13B, if a current exceeding the operating current value of the electromagnet 30 for forced opening in the case of a short circuit is generated in the main current path, the electromagnet 30 for forced opening in the case of a short circuit operates instantly; The protruding rod 31 is made to protrude downward. In response to the operation of the protruding rod 31, the first lever 110 rotates clockwise about the shaft 111 so as to compress the return spring 115. In response to the rotation of the first lever 110, the link member 112 is pushed upward, and the second lever 113 is rotated counterclockwise about the shaft 114. And the second lever 113
The tip of the opening/closing operation lever 17 is pushed down. As a result, the fixed contact 10 and the movable contact 8 are separated and the contact is released.

When the main current path is cut off, the short circuit forced opening electromagnet 30 connected in series to the main current path is also deenergized, and the protruding rod 31 returns upward. At this time, the link mechanism receives a counterclockwise restoring force from a return spring 115 at one end of the first lever 110, and a contact spring 1 provided at the bottom of the opening/closing lever 17 at the other end of the second lever 113.
1, it receives a restoring force that rotates clockwise. The link material 112 receives restoring forces from both in opposite directions, and maintains the open state of the contacts by canceling these forces. That is, this link mechanism for forcibly opening in the event of a short circuit constitutes a self-holding type link mechanism. The return operation of the link mechanism in the illustrated self-holding state is performed by further pushing down the opening/closing operation lever 17 by the spring release mechanism 75b activated by the operation of the overcurrent response device 45, 46 that has detected an overcurrent. When the opening/closing operation lever 17 is pushed down slightly, the second lever 113
is released into a state of helplessness. And the return spring 11
5, the second lever 107 is rotated clockwise, and the link mechanism returns to the state shown in FIG. 13A.

In this link mechanism for forced opening in the event of a short circuit, when the electromagnet for forced opening in the event of a short circuit is operated, the contacts are opened by the above-mentioned self-holding link mechanism, and the opened state is maintained, so that the contact can be restarted after opening. Safety against contact becomes more reliable and short-circuit breaking performance improves.

Further, the circuit breaker according to the present invention has rT E S Tj or r
It has an IsOLJ mode, and in both cases the main current path is cut off. The rT E S TJ mode is a mode for performing a circuit breaker monitoring operation. However, rlsOLJ cannot perform monitoring operations. In these modes, the disconnecting section 13 is turned off to cut off the main current path. FIG. 14 is a diagram of a disconnection contact opening/closing mechanism showing the opening/closing mechanism of this disconnection section 13. Referring to FIGS. 2 and 14, the disconnection opening/closing mechanism includes a pair of Luno (-105) and a Luno (-105) whose one end abuts the eccentric cam 76 and is rotatably supported by the shaft 106. L-shaped second lever 107 that engages with the first lever 105 and is rotatably supported by the shaft 108;
A 3-pole interlocking disconnection lever (-109) is engaged with the tip of the 3-pole interlocking disconnection lever 109 and is made of an insulator.
Inside there are a first fixed conductor 12 and a power supply side terminal conductor 1.
A conductor 25 connected to 6 is attached.

In operation, when the control handle 79 is rotated to the rTEST" or rIsOLJ position, the eccentric cam 76
similarly rotates, causing the first lever 105 that comes into contact with it to rotate counterclockwise. In response to the rotation of the first lever 105, the second lever 107 is rotated clockwise, and the three-pole interlocking disconnection lever 109, which is engaged with the second lever 107, is lifted upward. As a result, the conductor 25 separates from the power supply side terminal conductor 16 and the first fixed conductor 12, and the main current path is separated. Also, as shown below, rT E S
In the TJ mode, the limit switch 118 is in the "on" state and a monitoring operation is possible, and in the rlsOLJ mode, the limit switch 118 is in the "off" state, so the monitoring operation cannot be performed.

Next, with reference to FIG. 15, an electrical operation circuit for a switch using the switching operation electromagnet 60 will be described. The operation connection terminals 115, 116, and 117 are installed on the upper terminal shelf of the operation mechanism unit housing 3, and are connected from one side to the power supply connection terminal 115, the excitation coil of the opening/closing electromagnet 60, the limit switch 118, and the self of the opening/closing electromagnet 60. A holding microswitch 119 is connected in series, and an OFF switch for remote control is provided outside the switch.
It is connected to the other power supply connection terminal 115a via the push pin 1?0. A power source E is connected between the power source connection terminals 115 and 115a. Moreover, an ON push-pin 121 for remote control provided externally is connected in parallel between the connection terminals 116 and 117. The limit switch 118 is the control] λ handle 7
9 is rAUTOj, "ON" at the "T E S TJ" position
The switch is set to "off" at other switching positions. That is, this limit switch 118 is attached to the fixed frame 80 of the operation control mechanism 75, and is attached so that the operating lever of this limit switch comes into contact with the bent lug 87a of the cross-sook control lever 87. For example, the limit switch 118 is kept in the "ON" state in the "AUTO" position, that is, in the state where the toggle links 90, 92 are extended.

A microswitch 119 for self-holding of the electromagnet 60 for opening/closing operation is attached to the fixed frame 6 in the operation mechanism unit/S Ujifugu 3.
The end of a movable core operating pin 73 provided on the movable core 62 of the opening/closing electromagnet 60 is attached to the outer surface of the microswitch 5 so as to correspond to the microswitch operating pin 73. When the movable core 62 is attracted to the fixed core 61, the movable core operating pin 73 moves to maintain the microswitch operating lever in the "on" state. The relationships between the "on" and "off" states of the disconnection section 13, the main contact 5, and the limit switch 118 at each switching position of the control handle 79 are summarized in the following table.

A movable contact 9 having a fixed contact 10.10 and a movable contact 8.8 arranged so as to be openable and closable with the fixed contact 10.10, the movable contact 8.8 being connected to the fixed contact 10.10. A contact spring 11 attached to the movable contactor 9 and an opening/closing operation renocou (first connecting means) 17 that engage with each multipole to operate the movable contactor 9, and an opening/closing operation of this multipole. A second connecting means consisting of an electromagnet actuating Leno<-71 and a crossbar 74 that simultaneously operate the Reno-17 in multiple poles, an electromagnet 60 for opening/closing operation common to each pole, a spring release mechanism 75b common to each pole, and a multi-pole It is provided with three types of opening means each consisting of an electromagnet 30 for forced opening in the event of a short circuit, and overcurrent response devices 45 and 46 that detect and respond to overcurrent. Then, the control knob 79 is normally 1'-AUT
When placed in the OJ position and the opening/closing electromagnet 30 is energized, the movable contact 8.8 is brought into contact with the fixed contact 10.10 by the contact spring 111 and is in the "on" state.

When the opening/closing electromagnet 60 is deenergized, the second connecting means 71.74 is operated to push down the multipolar first connecting means 17, opening the movable contact 8.8, and turning it off. Keep it in this state. That is, the opening/closing operation of the main current path is performed by the opening/closing electromagnet 60.

Furthermore, when an overload current flows in the above-mentioned "on" state, the electronic overcurrent relay 45 detects the overcurrent and outputs a detection signal, and upon receiving the output signal, the release type electromagnet 46 operates and transmits the signal. The primary hook 97 and the secondary hook 99 are disengaged via the plate 54.103.

Then, the spring release mechanism 75b is released and the crossbar control lever 87 is rotated to push down the first connecting means 17. This pushes the movable contactor 9 downward and opens the main current path. Further, by rotating the crossbar control lever 87, the limit switch 118 is turned off, and the excitation coil 63 of the opening/closing electromagnet 60 is deenergized. Then, the movable iron core 62 separates from the fixed iron core 61 and follows the second connecting means 71, 74 which has already been moved to the separated position. In this way, in response to an overload current, the circuit is broken by the collapse of the spring release mechanism 75b, which operates at a high speed, so that the overload current breaking performance can be improved compared to conventional circuit breakers.

Furthermore, when a large current such as a short circuit current occurs, the electromagnet 30 for forced opening in the case of a short circuit is energized instantly, and the protruding rod 31
operates the link mechanism 18 for forced opening in the event of a short circuit to push down the first connecting means 17 and open the contacts. Also,
At the same time, the electronic overcurrent relay 45 detects a short circuit current, and its output signal operates the release type electromagnet 46 and the spring release mechanism 75b to operate the second connection means 71, 74 and open the first connection means 17. restrain in a remote position. Therefore, the electromagnet 30 for forced opening in the event of a short circuit operates early and guides the movable contact 9 to the open position, and then the electromagnet 30 for forced opening in the event of a short circuit is deenergized and the protruding rod 31 returns upward. The link mechanism for forced opening in the event of a short circuit maintains the operating state to keep the contacts open, and when the spring release mechanism operates, it automatically returns to the standby state and the open position of the movable contact 9 is maintained. be done.

Therefore, there is no need to provide the electromagnet 30 for forced opening in the event of a short circuit with a special latch mechanism or reset mechanism for preventing reopening. By providing the link mechanism 18 for forced opening in the event of a short circuit in the switching/closing housing unit 2, the electromagnet 30 for forced opening in the event of a short circuit can be connected to the current transformer 41 for current detection related to the rated current of the circuit breaker and the overcurrent. Response device 45.4
The tripping unit housing 4 can be provided with an overcurrent response means consisting of a tripping unit housing 4. The tripping unit housing 4 can be easily removed by removing the screw 24 at the input end of the excitation coil 36 of the electromagnet 30 for forced opening in the event of a short circuit. As a result, it is possible to replace the electromagnet 3o for forced opening at the time of short circuit and the overcurrent response means as a pair, which have a current capacity and an operation setting value according to the rated current.

Furthermore, when the rated current is small, the current capacity of the excitation coil 36 of the electromagnet 30 for forced opening in the event of a short circuit is reduced, the number of turns of the coil is increased, the resistance value is increased, and the passing short circuit current can be extremely reduced. .

After the forced opening link mechanism 18 operates in the event of a short circuit, it returns to the standby state due to the operation of the spring release mechanism 75b described above, and the opening/closing electromagnet becomes de-energized, causing the opening/closing operation lever 1 to return to the standby state.
This is also possible by pressing down further. Therefore, the link mechanism 18 for forced opening at the time of short circuit according to the present invention
The present invention is applicable to a circuit breaker including at least one of the electromagnets 60 for opening and closing the spring release mechanism 75b.

[Effects of the Invention] As described above, the circuit breaker according to the present invention includes a link mechanism that is linked between the first connecting means for opening and closing between the fixed contacts and the electromagnet for forced opening in the event of a short circuit, and this link mechanism By having a self-holding function and a self-recovery function, it is possible to reliably prevent accidents to officials when a short circuit is interrupted, and by omitting the artificial return operation when a circuit is interrupted, the circuit can be automatically interrupted. A circuit breaker capable of performing a reset operation can be realized.

[Brief explanation of the drawing]

FIG. 1 is an external perspective view of a circuit breaker according to an embodiment of the invention. FIG. 2 is a cross-sectional structural diagram of the circuit breaker, and FIG. 3 is a planar structural diagram taken along the cutting line XX in FIG. 2. FIG. 4 is a partial structural diagram showing the first contact opening means of the circuit breaker. FIG. 5 is a plan structural diagram for explaining the release type electromagnet 46 and the transmission mechanism connected thereto. FIG. 6 is a cross-sectional structural diagram showing the operation control mechanism. 7A, 9A, and 11A are top structural views of the control handle 79 in each switching position. Figures 7B, 9B and 11B are
11A is a plan view of the eccentric cam 76 and the slide plate 84 corresponding to FIGS. 11A to 11A. FIG. Figure 8A, Figure 10A
12A and 12A are cross-sectional structural views of the handle control mechanism section corresponding to FIGS. 7A to 11A, respectively. FIGS. 8B, 10B, and 12B are cross-sectional structural views of the spring release mechanism corresponding to FIGS. 88 to 12A, respectively. 13A and 13B are partial cross-sectional structural views showing the link mechanism for forcibly opening in the event of a short circuit, with FIG. 13A showing the link mechanism in a standby state, and FIG. 13B showing the contact opening state. FIG. 14 is a diagram showing the opening/closing mechanism of the new route contact. FIG. 15 is a circuit block diagram of the circuit breaker. In the figure, 1 is a base, 2 is an opening/closing unit housing, 3 is an operation mechanism unit housing, 4 is a tripping unit housing, 8 is a movable contact, 9 is a movable contact, 1
0 is a fixed contact, 12 is a first fixed conductor, 13 is a disconnection part,
14 is a second fixed conductor, 18 is a link mechanism for forced opening in the event of a short circuit, 30 is an electromagnet for forced opening in the event of a short circuit, 40 is a zero-phase current transformer, 41 is a current transformer for current detection, and 45 is an electronic type. Overcurrent relay, 46 is a release type electromagnet, 60 is an electromagnet for opening/closing operation, 7
1 is an electromagnet actuating lever, 74 is a 3-pole interlocking crossbar 1
75 is an operation control mechanism, 75a is a handle control mechanism section, 7
5b is a spring release mechanism, 76 is an eccentric cam, and 87 is a crossbar control lever. Note that the same reference numerals in the figures indicate the same or corresponding parts. Patent applicant Terasaki Electric Industry Co., Ltd.

Claims (5)

[Claims] (1) A fixed contact provided in the middle of the main current path connecting the independent power supply side circuit terminal and load side circuit terminal for each pole; a movable contact having a movable contact that performs a circuit opening/closing operation between the movable contacts; a first connecting means connected to the movable contact and provided for each pole to enable the contact opening/closing operation of the movable contact; a second connecting means for simultaneously operating the first connecting means in multiple poles; a movable part, a fixed part, and a release spring; the movable part moves in response to an opening/closing command of the main current path; circuit opening/closing means including a voltage-operated electromagnet for moving the second connecting means to a position where the movable part opens and separates the movable contact by means of an opening spring; a current-operated electromagnet that operates in response to the occurrence of an excessive current; and a current-operated electromagnet that is connected between the current-operated electromagnet and the first connecting means, and that operates in response to the operation of the current-operated electromagnet. moving the means to open the movable contact, and even if the current-operated electromagnet returns to a non-operating state, the state of engagement with the first connecting means is maintained to keep the movable contact open; death,
Furthermore, the voltage-operated electromagnet is de-energized and the second
When the first connecting means is further moved via the connecting means to maintain the open state of the movable contact, the first
A circuit breaker comprising: a link mechanism that self-returns to a standby state when disengaged from a connecting means; and forced opening means in the event of a short circuit. (2) In the short-circuit forced opening means, the current-operated electromagnet is of a plunger type, and the link mechanism includes first and second levers and one link member, and one end of the first lever. contacts the plunger of the current-operated electromagnet, the other end of the first lever is connected to one end of the ring material, the other end of the link material is connected to one end of the second lever, and the second lever The other end is in contact with the first connecting means, and when the current-operated electromagnet is operated, the plunger operates the first lever and the second lever is connected to the first lever via the link member. By moving the connecting means, the movable contact opens and closes, and even after opening, the link mechanism self-maintains its position, and the voltage-operated electromagnet becomes de-energized and the movable contact opens and closes through the second connecting means. and when the first connecting means is further moved, the engagement between the second lever and the first connecting means is released, and the link mechanism self-returns to the state before the operation of the current-operated electromagnet. The circuit breaker according to claim 1. (3) A fixed contact provided in the middle of the main current path connecting the independent power supply side circuit terminal and load side circuit terminal for each pole; a movable contact provided with a movable contact that performs a circuit opening/closing operation between the two; and a first connecting means connected to the movable contact and provided for each pole to enable the joining opening/closing operation of the movable contact; , a second connecting means for simultaneously operating the first connecting means in multiple poles, an overcurrent response means for detecting and responding to an overcurrent, a toggle link mechanism including a spring body, and a toggle link mechanism at one end of the toggle link mechanism. a lever disposed to actuate the second connection means; and a latch mechanism for transmitting a response signal from the overcurrent response means to the toggle link mechanism to release the spring body, the spring body being loaded with energy. In this state, the lever maintains the second connecting means at a position where the movable contact can be contacted, and when the latch mechanism is actuated by a response signal from the overcurrent response means, the spring body is released and the movable contact opens. a spring release mechanism that moves the second connecting means to a position where it is released; a current-operated electromagnet that is provided in the middle of the main current path and operates in response to the occurrence of an excessive current of a predetermined value or more; interlocking between the electromagnet and the first connecting means, the first connecting means is moved in response to the operation of the current operated electromagnet to open the movable contact, and the current operated electromagnet is Even when the movable contact returns to the non-operating state, the movable contact maintains the engagement state with the first connecting means to keep the movable contact open;
Further, when the spring release mechanism is actuated to further move the first connecting means via the second connecting means to maintain the open state of the movable contact, the first connecting means A circuit breaker comprising: a link mechanism that self-returns to a standby state when the engagement of the circuit breaker is released; and forced opening means in the event of a short circuit. (4) In the short-circuit forced opening means, the current-operated electromagnet is of a plunger type, and the link mechanism includes first and second levers and one link member, and one end of the first lever. contacts the plunger of the current-operated electromagnet, the other end of the first lever is connected to one end of the link material, the other end of the link material is connected to one end of the second lever, and the second lever The other end is in contact with the first connecting means, and when the current-operated electromagnet is operated, the plunger operates the first lever and the second lever is connected to the first lever via the link member. By moving the connecting means, the movable contact opens and closes, and even after opening, the link mechanism self-maintains its position, and the spring release mechanism operates to release the movable contact via the second connecting means. 4. The circuit according to claim 3, wherein when the first connecting means is further moved, the link mechanism is disengaged from the first connecting means and self-returns to a standby state before operation of the current-operated electromagnet. circuit breaker. (5) A fixed contact provided in the middle of the main current path connecting the independent power supply side circuit terminal and load side circuit terminal for each pole; a movable contact having a movable contact that performs a circuit opening/closing operation between the movable contacts; and a first connecting means connected to the movable contact and provided for each pole to enable contact opening/closing operations of the movable contact; , a second connecting means for simultaneously operating the first connecting means in multiple poles, an overcurrent response means for detecting and responding to an overcurrent, a toggle link mechanism including a spring body, and a toggle link mechanism at one end of the toggle link mechanism. a lever disposed to actuate the second connection means; and a latch mechanism for transmitting a response signal from the overcurrent response means to the toggle link mechanism to release the spring body, the spring body being loaded with energy. In this state, the lever maintains the second connecting means at a position where the movable contact can be contacted, and when the latch mechanism is actuated by a response signal from the overcurrent response means, the spring body is released and the movable contact is opened. a spring release mechanism that moves the second connecting means to a position where the second linking means is opened; a movable part, a fixed part, and a release spring; the movable part moves in response to an opening/closing command of the main current path, and a circuit opening/closing means including a voltage-operated electromagnet for moving the second connection means to a position where the movable contact is opened by a spring; a current-operated electromagnet that operates in response to the occurrence of an excessive current; and a current-operated electromagnet that is linked between the current-operated electromagnet and the first connecting means, and that operates in response to the operation of the current-operated electromagnet. Even when the movable contact opens and closes by moving the movable contact and the current-operated electromagnet returns to a non-operating state, the movable contact remains engaged with the first connecting means to maintain the open state of the movable contact. ,
Furthermore, either the spring release mechanism or the voltage-operated electromagnet is actuated to further move the first connecting means via the second connecting means to maintain the open state of the movable contact. and a link mechanism that self-returns to a standby state when disengaged from the first connecting means, and a forced opening means upon short circuit.