JPH04101320A - Remote controlled circuit breaker - Google Patents

Abstract

PURPOSE:To construct a remotely controlled circuit breaker compactly and accomplish remote control and high sped opening of the contact by opening the contact at a high speed when an overcurrent flows, and actuating a control mechanism part when overcurrent is sensed. CONSTITUTION:A handle 43 is turned in the auto position to put free a contact lever 55 and a maglink 53, through which contacts 5, 7, 8, 12 are opened and closed. When an overcurrent, flows, an overcurrent trip part 500 trips a control mechanism part 400 regardless of the maglink 53 coupled with a solenoid arrangement 300, and a push plate 51 rises to rotate the contact lever 55, and thus the contacts 5, 7, 8, 12 are opened at a high speed. Thereby a circuit breaker is embodied compactly in a single piece construction, and high frequency opening/closing performance with long lifetime is obtained by the solenoid arrangement 300 in remote control system, which can be separated by the control mechanism part 400. Thus high speed breaking performance is achieved by the overcurrent trip part 500, and the contacts are prevented from fusion attachment and exhaustion.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a remotely operated circuit breaker that has a high-frequency, long-life switching function in addition to the circuit breaker's original breaking function.

[Prior Art] Fig. 10 shows a conventional operation system diagram of, for example, a three-phase induction motor (M).
) are connected to an electric circuit (not shown) via a main circuit device constructed by connecting independent circuit breakers (A) and magnetic contactors (B) in series. The reason for connecting in this way is that the main purpose of the molded circuit breaker (A) is to protect equipment such as the main circuit equipment and motor (M) and electrical circuits in the event of a short circuit or overload, and the permissible number of opening and closing times is approximately Since it is less than 10,000 times, it is not intended to be used in places where switching is frequently performed, such as when switching on and off the power supply. It is also difficult to operate remotely. Therefore, as mentioned above, electromagnetic contactors (B) are used in places that are frequently opened and closed, but when used alone, if a large amount of current flows through the circuit due to a short circuit, the contacts will weld or melt, making them difficult to reuse. do not have. For these reasons, we had no choice but to connect the molded case circuit breaker (A) and the electromagnetic contactor (B) in a vertical layer as described above to compensate for frequent switching and remote control, and to prevent welding and damage of the contacts. is prevented.

Therefore, the molded circuit breaker (A) and the electromagnetic contactor (B) were housed together in a case (C) as shown in FIG. 11.

[Problems to be Solved by the Invention] However, when housing the molded circuit breaker (Δ) and the electromagnetic contactor (B) in the case (C) as described above, the molded circuit breaker (A) and Needless to say, the electromagnetic contactor (B) and the electromagnetic contactor (B) must be manufactured separately, and the installation of each of these devices to the case (C) and the wiring between each device are not only complicated, but also the inside of the case (C) There was a problem in that it required a large space and was large in size.

In particular, the electromagnetic contactor (B) is large in the height direction, which is a big obstacle to making the case (C) (control panel, light/power distribution board) thinner, especially in accordance with the JIS convention type. If the circuit breaker (A) is installed in the same panel as the circuit breaker (A), make unnecessary modifications to the panel of the panel where the electromagnetic contactor (B) is located so that the head of the electromagnetic contactor (B) protrudes. There was a problem in that it required time to produce the discs.

This invention was made to solve these problems, and it can be constructed compactly as a single component, and the remote-controlled electromagnetic part provides high-frequency and long-life opening/closing performance. It is an object of the present invention to provide a remote-controlled circuit breaker which can obtain high-speed breaking performance by separating the overcurrent tripping part and prevent welding and melting of the contacts.

[Means for Solving the Problems 1] In order to achieve the above object, a remote-controlled circuit breaker according to the present invention includes an electromagnetic part consisting of a contact part, an electromagnetic coil, a fixed iron core, and a movable iron core, and an overcurrent It has a pull-out part, a handle, a contact lever, a mag link, and a push plate, and when the handle is off, the contact lever and the mag link are restrained by the push plate, and when the handle is in auto mode, the push plate lowers and closes the contact lever and the mag link. The contact lever and the mag link are released from the link, and the control mechanism part is capable of transmitting the operation of the electromagnetic part to the contact part.

[Effect]

In this invention, when the handle is set to the auto position, the contact lever and the mag link become free, so the opening/closing of the contact part is performed via the mag link and the contact lever by the remotely operated electromagnetic part without using the control mechanism part. In addition, when an overcurrent flows, the overcurrent tripping section trips the control mechanism regardless of the mag link connected to the electromagnetic section, the push plate rises, rotates the contact lever, and opens the contact at high speed. let

〔Example〕

An embodiment of the present invention will be described with reference to FIGS. 1 to 9. Figure 1 is a side sectional view with the control handle off and remote control off, Figure 2 is a front view with part of the front cover removed, and Figure 3 is a back view with part of the back cover removed. Figure 4 is a schematic diagram of remote control off with handle auto, Figure 5 is a schematic diagram of remote control on with handle auto, Figure 6 is a schematic diagram of tripped state, Figure 7 is a perspective view of the electromagnetic part, and Figure 8 is a contact part. FIG. 9 is a perspective view of the control mechanism section that connects the electromagnetic section and the contact section.

In the figure, (1) is the circuit breaker case, and the front cover (l
It consists of a), a base (]b), and a back cover (1c). (2) is a power supply side terminal that is fastened to the base (lb) with a screw (3), and is provided with a terminal screw (4) for connecting an external line. (5) is a power supply side fixed contact welded to the power supply side terminal (2), (6) is a mover having a power supply side movable contact (7) and a load side movable contact (8) on both left and right sides, and (9) is a It is a crossbar spanning multiple poles, and a movable element (6), a spring holder (10), and a push spring (11) are housed in its groove (9a). The push spring (11) biases the movable element (6) in the closing direction via the spring receiver (10).

(12) is a load-side fixed contact that faces the load-side movable contact (8), and is welded to the load-side stator (13). (1
4A) and (14B) are arc extinguishing parts, which are surrounded by an insulating plate (14a) and an exhaust plate (14b) and have a grid (14c) made of a magnetic material. (15) is the back cover (1
c) Arc guard press-fitted into the base (16)
b) and an exhaust passage provided between the back cover (1c);
Reference numeral (17) denotes a mounting bracket, which is slidably held on the back cover (1c) and urged rightward by a spring (18). (19) is a power supply side barrier inserted into the groove of the base (1b), and is provided with an exhaust hole (19a).

The load side also has an exhaust hole (19a) between the base (1b) and the back cover (1c).

Next, on the front side of the base (1b), an electromagnetic part (300) is fixed to the base (1b) with screws (2o). In this electromagnetic part (300), a leaf spring (23) is arranged on the mag frame (21) to bias the fixed iron core (22) upward, and the fixed iron core (22) passes through the hole (22a). It is positioned in the mug frame (21) by the bin (24).

(25) is an electromagnetic coil, and has a conical spring (27) on the electromagnetic coil that urges the movable iron core (26) facing the fixed iron core (22) upward. (28) is a core holder, in which the movable core (26) and the bottle (29) are fixed and integrated. (30) is a terminal block, which is fixed by a mag frame (21), a screw 31), and a nut (32).

(33) is a control terminal, which has a screw (34) for connecting an external line. (35) is a changeover switch, and (35A) is an actuator, which are attached to the terminal block (30). The actuator (35A) is urged forward by a twisting spring (not shown) and is fixed by a switch cover (36). (37) is an attached stand, which has an electronic circuit section (38) and a limit switch (39). (39A) is an actuator, which is attached to the attached base (37) and biased counterclockwise by a twisting spring (not shown).

The limit 5W (39) has one end connected to the control terminal (33) on the right side of Figure 2 by a Riet wire (not shown), and the other end connected to the electronic circuit section (38) by a Riet wire (not shown). Connected. The other side of the control terminal (33) is connected to the electronic circuit section (38).
) directly connected to the In addition, 2 of the changeover switch (35)
The end is directly connected to the electronic circuit section (28). Furthermore, three lead wires (not shown) drawn out from the electromagnetic coil (25) are directly connected to the electronic circuit section (28).
40) is a one-piece cover that prevents the screw (34) from being exposed to the outside.

Next, the control mechanism section (4
00) is placed. (41) is a mechanism frame fixed to the base (1b) with screws (42), (43) is a handle rotatably supported on the mechanism frame (41) by a shaft (44), and the front cover (1a) opening (1d)
It protrudes further to the outside for manual operation, and one end (43a
) is engaged by the pin (45) to the link (46) to form a toggle link. A roller (47) or Ic is rotatably supported at the other end of the link (46). (4
Reference numeral 8) denotes a lever, which is rotatably supported on the mechanism frame (41) by a shaft (44), and whose tip end is locked with a latch (49). The latch (49) is attached to the mechanism frame (41
) is rotatably supported by a shaft (50) and biased counterclockwise by a twisting spring (not shown). (51
) is a push plate that is held movably up and down in each U groove (41a) of the mechanism frame (41), and is biased upward by a tension spring (52) and has a roller (47) on its upper end surface and a lever. (48) is engaged.

(53) is a mag link rotatably supported by a shaft (54) on the mechanism frame (41), one end (53a) of which is engaged with the shaft (28a) of the core holder (28). (
55) is a contact lever whose central part is engaged with one end (53, b') of the mag link (53) by a pin (56), and whose one end (55a) is a hollow part (51a) of the push plate (51).
The other end (55b) is engaged with the bottle (55b) in a manner that penetrates through the bottle (55b).
7). By engaging both ends (57a) of the bottle (57) and the engagement groove (9b) of the crossbar (9), the contact lever (55) and the crossbar (9)
(See FIG. 8).

Next, an overcurrent bow removal part (500) is arranged on the front load side of the base (1'b). (58) is a yoke that is press-fitted into the groove (1e) of the base (1b). (59) is a pipe portion, which is soldered to the yoke (58). (60) is a tripping coil that holds a pipe part (59) in the center, and a load side terminal (61) is welded to one end (60a).
A connecting conductor (62) is welded to the other end (60b). The load side terminal (61) is press-fitted into the base (1b) and has a terminal screw (4) for connecting an external line. Connecting conductor (62
) is fixed to the load side stator (13) by screws (63). (64) is the coil end, and the tripping coil (64) is the coil end.
0) between the pipe part (59) and the yoke (58).

(65) is a movable piece that is biased clockwise by a tension spring (66). To the right of the tip (65a) of the movable piece (65) is a trip bar (6
7) or three poles. (68) is an insulating barrier, which is inserted into the groove (1f) of the base (1b).

Next, the operation will be explained. First, the off state of the handle (43) shown in FIGS. 1 to 3 will be explained. In the OFF state, the shaft (
54), the clockwise moment M1 with respect to the electromagnetic part (
300) is larger than the counterclockwise moment M2 of the conical spring (27) with respect to the axis (54). Therefore, the contact lever (55) has one end (55a) and the push plate (51).
The engaging part (5l b) receives an upward force, and the bottle (5l b)
At the position 6), a force is applied downward, so it is restrained as shown in Figure 1. For this reason, mag link (53) and bottle (56)
) and the shaft (54), the movable core (26) is positioned at a position with some gap from the fixed core (22).

When the handle (43) is tilted to the right from the above-mentioned OFF state to the auto position, the link (46) appears as shown in Figure 4.
extends and lowers against the push plate (51) or tension spring (52), releasing the contact lever (55) from its restraint. At this point, the moment M1 of the pulling spring (52) becomes zero, so the moment M2 of the conical spring (27) causes the mag link (53) to rotate counterclockwise around the shaft (54), and the movable iron core (26) ) is positioned at a position where it contacts the terminal block (30). At the same time, the contact lever (55)
The crossbar (9) moves upward and both contacts (
5), (7), (8), and (12) are somewhat reduced.

In the handle auto shown in Figure 4, limit switch (39
) is the actuator (3) that detected the movement of the push plate (51).
9A), it enters the ON state. Control terminal from outside (33)
When a voltage is applied to , the electromagnetic coil (25) is excited and the movable iron core (26) is attracted. During suction, the actuator (3) is moved by the protrusion (28a) of the core holder (28).
Push the protrusion (35a) of 5A) downward and rotate it to switch the changeover switch (35) (see Fig. 7).

The electronic circuit section (38) connects the electromagnetic coil (2) during the suction process.
5) is full-wave rectified until the changeover switch (35) is switched, then half-wave rectified, and direct current is applied to the movable iron core (26).
) is used to attract and hold. Electronic circuit department (38
) The mag link (53) is rotated clockwise by the suction of the
b) is rotated upward using the fulcrum, and the crossbar (9
), the mover (6) rises, and both contacts (5) and (7
), (8), and (12) are closed to obtain contact pressure by the push spring (11).

FIG. 5 shows the excitation state when the handle is set to auto. The impact force of the movable core (26) on the fixed core (22) is transmitted by the leaf spring (
23).

Next, in Fig. 5, when the voltage application to the control terminal (33) is turned off, the movable iron core (26) is moved in the opening direction by the conical spring (27), and the mag link (53) is rotated counterclockwise. move. For this reason, the contact lever (55) rotates counterclockwise about the engaging part (5l b) as a fulcrum, so the mover (6) descends via the crossbar (9), and both contacts (5) .

(7), (8), and (12) are separated and return to FIG. In this way, the steps in FIGS. 4 and 5 are repeated, that is, the contacts are opened and closed by remote control without using the control mechanism section (400).

In the contact ON state shown in Figure 5, the current flows through the power supply side terminal (2) -
Power supply side fixed contact (5) - Power supply side movable contact (7) - Mover (6) - Load side movable contact (8) - Load side fixed contact (12)
) - the load side stator (13), the connecting conductor (62), the tripping coil (60), and the load side terminal (61).

When an overcurrent or short circuit current flows in FIG. 5, the movable piece (65) rotates counterclockwise, and the tip (65) rotates counterclockwise.
At step 5a), move the trip bar (67) to the right and rotate the latch (49) clockwise. As a result, the lever (48) is released, so the push plate (51) pushes the roller (47) to the left side together with the lever (48) by the tension spring (52) and rises, causing the contact lever (55) to move upward.
is rotated counterclockwise around the pin (56), the mover (6) is lowered via the crossbar (9), and both contacts (5), (7), (8), ( 12) Release (
Figure 6). At this time, the actuator (39A) rotates counterclockwise as the push plate (51) rises, the limit switch (39) also turns off, the electromagnetic coil (25) is no longer excited, and the movable iron core (26 ) is a conical spring (27)
However, the moment M1 of the tension spring (52) with respect to the shaft (54) causes the conical spring (27
) is larger than the moment M2 with respect to the shaft (54), the mag link (53) remains in the position shown in FIG. 1, and the movable iron core (26) only rises somewhat and then stops. Furthermore, since the handle (43) is biased counterclockwise by a torsion spring (69) (not shown) centered on the shaft (44), the roller (47) is pushed away to the left along with the link (46). At the moment when the handle (43) is released from the restraint and rotates counterclockwise, the handle (43) becomes in the handle-off state. As the handle (43) moves, the lever (48) pushes the roller (47) to the right and engages the latch (49) while resting on the push plate (51), completing the reset operation.

In other words, when an overcurrent or short-circuit current flows and trips, the state shown in Fig. 6 occurs, but this state is momentary and the handle-off state shown in Fig. 1 is immediately returned after that.
[Effects of the Invention] As described above, according to the present invention, it is possible to make a single structure compact (especially in the height direction), and the remote-controlled electromagnetic part provides high-frequency and long-life opening/closing performance. When current flows, the overcurrent tripping section ignores the slow movement of the electromagnetic section and trips the control mechanism section, after which the push plate instantly rises and rotates like a contact lever, allowing the contact section to open at high speed. This has the effect of being able to shut off the contacts without welding or erosion.

[Brief explanation of the drawing]

Fig. 1 is a side sectional view showing an embodiment of the present invention with the control handle off and remote control off, Fig. 2 is a front view with the front cover partially removed, and Fig. 3 is the back side with the back cover partially removed. Figure 4 is a schematic diagram of the remote control off with the handle auto, Figure 5 is a schematic diagram of the remote control on with the handle auto, Figure 6 is a schematic diagram of the trip state, Figure 7 is a perspective view of the electromagnetic part, and Figure 8 is a schematic diagram of the remote control on. Fig. 9 is a perspective view of the control mechanism that connects the electromagnetic part and the contact, and Fig. 10 is a conventional operation system of three-phase IM. 11 are diagrams showing the conventional one. In the figure, (5), (7), (8), (12) are contact parts, (22) is a fixed core, (25) is an electromagnetic coil, (2
6) is the movable iron core, (43) is the handle, (51) is the push plate, (53) is the mag link, (55) is the contact lever, (300) is the electromagnetic part, (400) is the control 8! Lateral part, (
500) indicates an overcurrent tripping section. Note that the same reference numerals in each figure indicate the same or corresponding parts. Figure Figure Figure 1, Indication of case 2, Title of invention 3, Authorized letter of amendment (spontaneous) March 1991 Patent Application No. 2-217621 Remotely operated circuit breaker Representative Mitsubishi Electric Co., Ltd. 5, Claims column of the specification to be amended Drawings column of the detailed description of the invention in the specification Page 6, Contents of the amendment (1) The scope of claims in the specification is corrected as shown in the attached sheet. do. (On page 9, lines 8 to 9 of the same page, and on page 9, lines 9 to 10, [electronic circuit section (28) J] is replaced by r [child circuit section (38), (3) From page 13, line 20 to page 14, line 1, [protrusion (28 &) J is corrected as "protrusion (28b) J." (Figures 1 and 4 of the 4 drawings) Figure 7 is corrected as shown in the attached sheet. Above system ρ Attachment Claims (1) A contact portion, an electromagnetic portion consisting of an electromagnetic coil, a movable iron core, and a fixed iron core, and the operation of the movable iron core is controlled by the contact portion. The mag link has an externally operable handle and a push plate having a hollow part, and one of the push plates is provided with a contact lever that engages with the hollow part, and the other part is connected to the contact lever. When the handle is turned off, the mag link and the contact lever can be restrained to hold the contact portion in an open state, and when the handle is in auto mode, the contact lever is connected to the push plate. It operates as if it were integrated with the mag link using the hollow part as a fulcrum, and when an overcurrent flows, the contact lever rotates at high speed as the push plate rises regardless of the movement of the mag link. A remotely operated circuit breaker comprising: a control mechanism section that opens a contact section at high speed; and an overcurrent tripping section that operates the control mechanism section when an overcurrent is detected.

Claims (1)

[Claims] (1) It has a contact part, an electromagnetic part consisting of an electromagnetic coil, a movable core, and a fixed core, a mag link that transmits the operation of the movable core to the contact part, an externally operable handle, and a push plate having a hollow part. Further, one side of the push plate is provided with a contact lever that engages with the hollow portion, and the other side is provided with the mag link that connects with the contact lever, and when the handle is turned off, the mag link and the contact lever are restrained. The joint can be held in an open state, and when the handle is in auto mode, the contact lever operates as if it were integrated with the mag link using the hollow part of the push plate as a fulcrum, and overcurrent flows. a control mechanism section that rotates the contact lever at high speed as the push plate rises regardless of the movement of the mag link to open the contact section at high speed; and a control mechanism section that operates the control mechanism section when an overcurrent is detected. A remote-controlled circuit breaker characterized by being equipped with an overcurrent tripping section.