JPH02109232A - Remote operating type circuit breaker - Google Patents

Abstract

PURPOSE:To integrate a control terminal block space-savingly into a breaker case and also to attempt improvement in its assembly workability, by mounting the control terminal block on a base for being positioned and fixed. CONSTITUTION:Setting a control handle 50 in its AUTO-RUN position causes a control lever 63 to be idled so that contact section 8 to 17 can be opened and closed respectively via the control lever 63 by a remote operating type electromagnetic section 200 without actuating the contact sections 300 through a control mechanism section 300 while at flowing of an overcurrent, the electromagnetic section 200 is disconnected to trip the control mechanism section 300 by an overcurrent tripping section 400 for opening and breaking the contact sections 8 to 17 via the control lever 63. Moreover, the control terminal block 41 is disposed on the cover side of a magnet frame 25 to be mounted on a base 5b together with the electromagnetic section 200 in such a manner as being surveyable through the opening 5a of a cover, and therefore the control terminal block 41 can be assembled compactly and readily into a breaker case whereby the assembly workability may be improved.

Description

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

[Prior Art] Fig. 8 shows a conventional operation system diagram of, for example, a three-phase induction motor (l()), and as is clear from this diagram, <the conventional electric motor (l())
() are connected to an electric circuit (not shown) via a main circuit device configured by connecting an independent circuit breaker (1) and an electromagnetic contactor (2) in series. The reason for this connection is that the main purpose of the molded circuit breaker (1) is to protect equipment such as the main circuit equipment, motor (H), 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, use electromagnetic contactors (
2) is used, but when used alone, if a large amount of current flows through the circuit due to a short circuit or the like, the contacts will weld and melt, making them unusable. For these reasons, it was unavoidable to connect the molded circuit breaker (1) and the electromagnetic contactor (2) vertically as described above to compensate for frequent switching and remote operation, and to prevent welding and damage of the contacts. is prevented.

Therefore, the molded circuit breaker (1) and the electromagnetic contactor (2) were housed together in a case (3) as shown in FIG.

[Problems to be Solved by the Invention] However, when housing the molded circuit breaker (1) and the electromagnetic contactor (2) in the case (3) as described above, the molded circuit breaker (1) and Do not manufacture the electromagnetic contactor (2) separately (
Of course, the installation of each of these devices to the case (3) and the wiring between each device are not only complicated, but also require a large space inside the case (3), making it difficult to create a doll. There was a problem.

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 opening/closing performance. The purpose of the present invention is to provide a remote-controlled circuit breaker that can disconnect the electromagnetic part and provide high-speed breaking performance using the overcurrent tripping part, and also allows the control terminal block to be compactly incorporated into the circuit breaker case and has good assembly workability. do.

1. Means for Solving the Problem] In order to achieve the above object, a remote-controlled circuit breaker according to the present invention includes: a circuit breaker case consisting of a base and a cover; a contact section placed on the base; , an electromagnetic part installed on the base by a magnetic frame and having an electromagnetic coil, a fixed iron core, and a movable iron core; a control lever and a control handle; and when the control handle is turned off, the control lever is held and the control handle is turned off. It is provided with a control mechanism section that leaves the control lever idle in auto mode and an overcurrent tripping section, and furthermore, a control WJ@child stand connected to the electromagnetic coil is arranged on the cover side of the magnet frame. It is installed on the base together with the electromagnetic section so as to be visible from the opening of the cover.

[Function] In this invention, when the control handle is set to the auto position, the control lever becomes idle, so when the control mechanism section is passed through, the contact section can be opened and closed via the control lever by a remote-controlled electromagnetic section. When current flows, the electromagnetic part is disconnected and the overcurrent tripping part trips the control mechanism part.
The contacts are opened and shut off via the control lever.

In addition, in this invention, the control terminal block is placed on the base together with the electromagnetic part so that it can be seen through the opening of the cover of the magnet frame.
The control terminal block can be compactly and easily incorporated into the circuit breaker case.

[Example] An example of this defense will be described with reference to FIGS. 1 to 7. Figure 1 is a side cross-sectional view showing the state in which the control handle is off and the remote control is off, Figure 2 is a front view with the front cover in Figure 1 partially removed, and Figure 3 is the back cover in Figure '1. Figure 4 is a schematic diagram of Figure 1 showing the remote control off state with the control handle auto and Figure 5 shows the remote control on state with the control handle auto. 1 is a schematic diagram of FIG. 1, FIG. 6 is a schematic diagram of FIG. 1 showing a trip state, and FIG.
The figure is an exploded perspective view of the electromagnetic part.

In the figure, (5)(Y) is the circuit breaker/case, and the front cover (5) is
a), a base (5b), and a back cover (5C). (6) is a power supply side terminal that is press-fitted into the base (51) and is provided with a terminal screw (7) for connecting an external line. (8) is the power supply side stator held on the back side of the base (5b), and one end is connected to the power supply side end f (6) by 7a).
It is connected to the. (9) is a power supply side fixed contact welded to the other end of the power supply side stator (8), (10) is a movable element having a power supply side movable contact (1) and a load side movable contact (12) on both left and right sides; (13) is a mover holder made of an insulator,
The movable element (10) is fitted and held. (14) is a crossbar that spans the volume, and a movable element holder (13) is movably fitted and housed in its groove (14a).
15) is a push spring that biases the movable element (10) in the closing direction, and the spring receiver of the back cover (5C) is housed in the part (5d).

(16) is a load-side fixed contact that faces the load-side movable contact (12), and is welded to the load-side stator (17).

(18A) and (18B) are arc extinguishing parts arranged on both the left and right sides of the movable element holder (13), and are surrounded by an insulating plate t'+aa> and an exhaust plate (18b), and a grid (18c) made of a magnetic material. have. (19) is the base (5b
) and the back cam (5C), and an exhaust hole (20) is provided in the exhaust passage. Reference numeral (21) denotes a mounting bracket which is movably held on the back cover (5C) and urged rightward by a spring (22). As described above, the contact parts (8) to (17) are housed in the space formed between the base (5b) and the back cover (5C), and the crossbar (14) is attached to the base (5b). opening (23)
It is connected to the upper part.

Next, the electromagnetic part (200) is attached to the power supply side terminal (6) side on the front side of the base (5b) with the screw (24).
) is fixed. As shown in Fig. 7, this electromagnetic part (200) has an electromagnetic coil (26) inserted into a mouth-shaped magnet frame (25), and a coil (2G) inserted from the top.
The hole (26a) and the opposing piece (25a) of the magnet frame (25), the hole (25b) of (25a), (25
b) the legs (28a) to (28c) of the fixed core (28) to which the bear-removal coil (27) is fixed are respectively inserted, and the notch (28d) of the fixed core (28);
Each elastic body (29) (a spring in this embodiment) is inserted between the magnet frame (28d) and the magnet frame (25) to prevent the fixed core (28) from coming out of the magnet room (25). This allows the movable iron core (30) to absorb impact force. The movable core (30) is the holder (31)
The stopper (32) is fixed on the holder (32), and the holder (3
Each bearing part (31a) is provided at both ends of the transmission lever (34).
34a). In addition, the transmission lever (34) is attached to the shaft (35) on the magnet frame (25).
Each protrusion (34b) of the transmission lever (34) and each protrusion (34b) of the magnet frame (25)
25c) biases the movable core (30) and the fixed core (28) in the direction of opening.

In the figure, (37) and (38) are auxiliary switches, and screws (39)
).

(40) is fixed to the magnet frame (25), and each actuator (37a), (38a
) are arranged so as to engage with each protrusion (31b) of the holder (31) and to be turned on and off by the movement of the movable iron core (30).

Further, in the figure, (41) is a control terminal block, into which a terminal (42) is press-fitted, and is provided with a terminal screw (43) for connecting an external line. In this embodiment, among the six sets of three terminals (42), two sets of four terminals (42) at both ends are connected to the auxiliary switch (37).
), (38) are connected by lead wires (44) and used as a terminal block for an auxiliary switch, and one of the two terminals (42) on the inside is connected to the limit switch (45). through the coil (26) and the other directly to the coil (26). That is, the call (26) between the limit switch (45) and the electromagnetic part (200)
or connected in series.

The limit switch (45) is attached to the magnetic frame (2
5) It is fixed by 46). The terminal block 43) is exposed to the outside from the opening of the front cover (5a) so that external electric wires (not shown) can be connected, and the control terminal block (41) is fixed at both left and right ends. The legs (old a) and (41a) are inserted and fixed into the holes (25d) and (25d) of the magnet frame (25), respectively. (48) is a terminal cover that is attached to each pole.
1d The notch part (48aL (48a) of the stone is fitted into each protrusion (41b), (41b) of the control terminal block (Zil) so that the terminal block 43) is not unnecessarily exposed to the outside. be. (48b) is the terminal cover (48)
This is the bending line set in .

Next, a control mechanism section (300) is arranged in the middle part on the front side of the space (5b). (49) is the base (5b
), the mechanical frame fixed by 49a), (
Reference numeral 50) denotes a control handle rotatably supported by a shaft (51) on the mechanism frame (49), which protrudes outward from the opening (52) of the front cover (5a) and can be operated manually; The internal protrusion (50a) is connected to the bottle (53
) to form a toggle link mechanism. A roller (5) is attached to the other end of the link (54).
5) is rotatably supported.

(56) is a lever, and the shaft (51) is attached to the mechanism frame (49).
), and the tip is supported by a latch (
57). The latch (57) is rotatably supported on the mechanism frame (49) by a shaft (58) and biased counterclockwise by a spring (not shown). (59) is the mechanism frame (49) and the J-shaft (60
) is rotatably supported by a trip bar which is biased clockwise by a torsion spring (not shown) and is adapted to engage a latch (57). (61) is a push plate held movably up and down in each U groove (49b) of the mechanism frame (49), which is urged upward by a tension spring (62) and has a roller (55) on its upper end surface. As you ride, the lever (56) is engaged. (63) is attached to the mechanism frame (
49) is rotatably supported by a shaft (64), one end (63a) engages with the crossbar (14) and the other end (63b) engages with the locking part (34) of the transmission lever (34).
311C) and the hole (61a) of the push plate (61).
) is engaged within. In Figure 1, the control handle (50
) is in the OFF state, the control lever (63) is restrained upward by the bow spring (62) via the push plate (61). That is, the push spring (
Since the load on the tension spring (62) is greater than the load on the tension spring (15), the control lever (63) is held in the state shown in Figure 1, and both contacts (9L (11)) are held.

(12), (16) or open. Also, at this time, the first
As shown in the figure, a gap is provided between the other end (63b) of the control lever (63) and the locking portion (34c) of the transmission lever (34).

Next, on the load side of the front side of the base (5b), an overcurrent tripping section (40
0) is placed. (85) is the first yoke, and one end (65a) has a load side stator (17) or a screw (66).
are connected by a bimetal (67) and are provided with an adjusting screw (68). (69) is a bobbin, which is provided with a central core (70) and a plunger (11) which are caulked to the first yoke (65). The plunger (71) is urged upward by a detection push spring (72).

Further, the tip (71a) of the plunger (71) is engaged with the U groove (59a) of the trip bar (59), and when the plunger (γ1) is attracted toward the core (γ0), the trip bar (59) is Rotate against the twisting spring (73
) is the rod, the hollow part of the core (70), the base (5b)
It extends to the mover boulder (10) through the hole (74) of the crossbar (14) and the hole (14a) of the crossbar (14). Similarly, when the plunger (71) is attracted toward the core (70), the plunger (71) hits the movable element holder (10) via the rod (73), causing both contacts (9), (11),
(12).

(16) is released. (75) is the '1st yoke (6
5) is caulked to the second yoke, (76) is a coil, and one end is attached to the tip of the bimetal (67).
1), and the other end is connected to the load side terminal (78). A terminal screw (79) for connecting an external line is provided on the load side terminal (78). (80) is the actuating piece;
An arm (80a) rotatably supported on the first yoke (65) by a shaft (81), biased counterclockwise by a spring (not shown), and engaged with the trip bar (59). have. The tripping time is adjusted by rotating the adjusting screw (68) to change the gap between the tip of the bimetal (67) and the actuating piece (80).

Next, the operation will be explained.

From the OFF state of the control handle (50) shown in Figs. 1 to 3, tilt the control handle (50) to the right and set the control handle (50) to the oar position as shown in Fig. 4. The link (54) extends and moves down against the push plate (61) or the tension spring (62), releasing the control lever (63). The control lever (63) has contact parts (8) to (
When the push spring (15) of 17) rotates clockwise via the crossbar (14) and there is no gap between the electromagnetic part (200> and the transmission lever (34)), the transmission lever (34)
It is stopped by the tension spring (36) that urges the . In other words, the tension spring (36) is lower than the load of the push spring (15).
This is because the design is such that the load is large. At this time, the mover (10) is controlled by the transmission lever (34),
/Both contacts (9H11), (12) rise as the gap with the bar (63) disappears.

The separation distance between (16) is somewhat reduced compared to the states shown in FIGS. 1 to 3.

Then, with the handle auto as shown in Figure 4, turn the electromagnetic part (20
0) is immobile (when stock cutting (remotely off), the limit switch (45) detects the movement of the push plate (61) and is in the on state). When a voltage is applied to the terminal (42) from the outside, the coil (2G) is excited and the movable core (30) is attracted to the fixed core (28). Together with the movable iron core (30), the transmission lever (34) rotates counterclockwise against the tension spring (36) to release the control lever (63).
The movable element (10) is raised by the push spring (15), and both contacts (9), (11), (12), and (16) are closed. When this handle is auto-excited (remotely turned on)
is shown in Figure 5. At this time, the protrusion (
31b) pushes the actuators (37a'l, (38a) of the auxiliary switches (37), (38), and operates the contacts of the auxiliary switches (37), (38). Also, the movable iron core (30) presses the actuators (37a'l, (38a)) of the auxiliary switches (37), (38). 28), but the impact force is absorbed by the elastic body (29).

Next, in FIG. 5, when the voltage application to the terminal (42) is turned off, the movable iron core (30) is moved in the opening direction by the tension spring (36), and the transmission lever is (34) causes the control lever (63) to rotate counterclockwise, overcoming the push spring (15) of the mover (10) and causing both contacts i9), (11), (12).

(16) is released, and the state shown in FIG. 4 is returned again.

In this way, the states shown in FIGS. 4 and 5 can be repeated, that is, the contacts can be opened and closed by remote control (voltage application) without going through the control mechanism section (300).

Now, in the on state shown in Figure 5, the current flows through the power supply side terminal (6).
- = Power supply side stator (8) - Power supply side fixed contact (9) → Power supply side movable contact (11) → Mover (10) → Load side movable contact (12) - Load side fixed contact (16) → Load side stator (17) → first yoke (65) → bimetal (6 ha →
Flexible copper stranded wire (77) → Coil (76) → Load side terminal (7
8).

When an overcurrent flows in Fig. 5, the bimetal (67) bends to the right, rotates the trip bar (59) counterclockwise through the actuating piece (80) against the twisting spring, and latches. (57) is rotated clockwise against the twist spring.The lever (56) is released from this wrap, so the push plate (61) is moved by the tension spring (62) to the roller (55). ) to the left side together with the lever (56>) and move up, and rotate the control lever (63) counterclockwise against the push spring (15) to close both contacts (
9), (Ii), (12), and (1(3)) are opened. This trip state is shown in FIG.

At this time, the limit switch (45) is also
) rises, the coil (26) is no longer energized, so the movable iron core (30) is opened in the same way as the off operation, and the control lever (63) is activated via the transmission lever (34).
Therefore, both contacts (9), (11), (12), (16
) is transmitted in the direction of opening. That is, the contact part (8)
Two spring loads, a tension spring (62) and a tension spring (36), act on ~ (17), and both contacts (9) and (11) have very strong horns against the push spring (15). , (12),
(IG) is released.

]7 Next, in Fig. 5, when a short circuit current flows, the coil (1
6), the plunger (71) is instantly attracted in the direction of the core (70), and the trip bar (59) is rotated counterclockwise against the twisting spring to activate the mechanism in the same way as when the bimetal (67) is operated. At the same time as tripping, directly hit the movable element holder (13) via the plunger (71) or rod (73), and both contacts (9)l), (12),
(16) is released. The arc that occurs between the contacts is
between the mover (10) and each stator (8), (17), and then both arc runners (82),
(83) and each stator (8), (17), and is divided and extinguished by each grid (18c). In addition,
The hot gas generated in each arc extinguishing part (18A), (18B) passes through the hole (not shown) in each exhaust plate (18b), passes through the exhaust passage (19), and exits from each exhaust hole (20). Exhausted.

To perform the reset operation, turn the control handle (50) from the state shown in Figure 6.
) to the left (off direction), the lever (56) pushes the roller (55) to the right and engages the latch (57) with the roller (55) placed on the push plate (61) to complete the process.

As explained above, both fixed legs (
41a) and (41a) respectively with the magnetic frame (
Opposing piece (25a) of (25), number hole (25a) of (25a)
(25d), place the control terminal block (41) on the front cover (5a) side of the magnet frame (25), and attach the magnet frame (25) to the base (5b) with screws (24). Possibly a control terminal block (4
1) on the base (5b), the control terminal block (41
) can be positioned and fixed, the control terminal block (41) can be compactly and easily incorporated into the circuit breaker case (5).

[Effects of the Invention] As described above, according to the present invention, it can be constructed compactly as a single component, high-frequency and long-life opening/closing performance can be obtained by the remote-controlled electromagnetic part, and the electromagnetic part can be controlled by the control mechanism part. It is possible to obtain high-speed breaking performance by separating the overcurrent tripping section, and furthermore, the control terminal block can be compactly incorporated into the circuit breaker case, and its assembly workability is good.

[Brief explanation of the drawing]

Fig. 1 is a side sectional view showing an embodiment of the present invention when the control handle is off and the remote control is off; Fig. 2 is a front view with the front cover of Fig. 1 partially removed; Fig. 3 Figure 1 is a back view of Figure 1 with the back cover partially removed, Figure 11 is a schematic diagram of Figure 1 showing the state of remote control O2 with the control handle automatic, and Figure 5 is a schematic diagram of the remote control with the control handle automatic. Figure 6 is a schematic diagram of Figure 1 without showing the on state, Figure 6 is a schematic diagram of Figure 1 without showing the nitrite state, Figure 7 is an exploded perspective view of the electromagnetic part, and Figure 8 is a diagram of a three-phase induction motor. The conventional operation system diagram, Fig. 9, is a diagram showing the conventional one. In the figure, (5) is the circuit breaker case, (5a) is the front cover, (5b) is the base, (5C) is the back cover, (6) is the power supply side terminal, (8) to (17) are the contact parts, (25) is the magnet frame, (26) is the electromagnetic coil, (28)
is a fixed core, (30) is a movable core, (34) is a transmission lever (200) is an electromagnetic part, (41) is a control terminal block, (47)
is the opening of the front cover (5a), (50) is the control handle, (63H; is the control lever, (300) is the control mechanism part,
(400) indicates an overcurrent tripping portion, and (78) indicates a load side terminal. Note that the same reference numerals in the figures indicate the same or corresponding parts.

Claims (1)

[Scope of Claims] [1] A circuit breaker case consisting of a base and a cover, a contact section installed on the base, and an electromagnetic section installed on the base with a magnetic frame and having an electromagnetic coil, a fixed iron core, and a movable iron core. , a control lever that transmits the operation of the movable iron core to the contact portion, and a control handle that can be operated externally; and when the control handle is turned off, the control lever is held in the contact portion OFF state, and the control handle is automatically operated. a control mechanism section that sometimes allows the control lever to be idle so that the operation of the movable iron core is transmitted to the contact section;
and an overcurrent tripping section for tripping the control mechanism section when an overcurrent is detected, and a control terminal block connected to the electromagnetic coil is disposed on the cover side of the magnet frame, and the opening of the cover is provided. A remotely operated circuit breaker, characterized in that it is installed on the base together with the electromagnetic part so that it can be viewed from above.