JPH02100228A - Remotely operated type circuit breaker - Google Patents

Abstract

PURPOSE:To prevent the breaker in the title from the deterioration of its insulating performance, due to arcing from a unit of contacts, by incorporating the unit of contacts into a breaker case from the rear-cover side of a base and further isolating the unit of contacts from other units via an insulating wall. CONSTITUTION:The breaker in the title has a of contacts, 8 to 17, an electromagnetic unit 200 comprised of an electromagnetic coil 26, a stationary iron core 28 and a movable iron core 30, a control mechanism unit 300 which includes both a control lever 63 and a control handle 50 and also holds the control lever 63 when the control handle 5 is set to OFF while making the control lever 63 idled when the control handle 50 is set to AUTO-RUN, and an overcurrent tripping unit 400. Then, the breaker is fabricated by comprising a breaker case 5 of a front cover 5a, a base 5b and a rear cover to, and incorporating the electromagnetic unit 200, the control mechanism unit 300 and the overcurrent tripping unit 400 into the breaker case from the front- cover side of the base 5b while incorporating the unit of contacts, 8 to 17 thereinto from the rear-cover side of the base 5b, and further isolating the contacts, 8 to 17 from other units via an insulating wall. This makes it possible to prevent the breaker from the deterioration of its insulating performance, due to arcing from the unit of contacts, 8 to 17.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to an improvement in a remotely operated 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 (T1).
) are connected to an electrical circuit (not shown) via a main circuit device configured by connecting independent circuit breakers (1) and magnetic contactors (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 the frequency is less than 1oooo times, it is not intended to be used in places where the frequency of switching is high, 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 is unavoidable to connect the molded circuit breaker (1) and the N magnetic contactor (2)
Layered connections are used to support multiple opening/closing operations and remote control, as well as to prevent welding and erosion of contacts.

Therefore, the molded circuit breaker (1) and the N magnetic contactor (2) were housed together in a case (3) as shown in FIG. 9.

[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 Needless to say, the electromagnetic contactor (2) and the electromagnetic contactor (2) must be manufactured separately, and the installation of each of these devices to the case (3) and the wiring between each device are not only complicated, but also the inside of the case (3) becomes complicated. There was a problem in that it required a large space and was large in size.

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 remotely operated circuit breaker which can obtain high-speed breaking performance by separating the overcurrent tripping section and prevent deterioration of insulation performance due to arcing from the contact section.

[Means for Solving the Problems 1] In order to achieve the above object, a remote-controlled circuit breaker according to the present invention includes a contact section, an electromagnetic section consisting of an electromagnetic coil, a fixed core, and a movable core, and a control lever. and a control handle, and a control mechanism section that holds the control lever when the control handle is off and leaves the control lever loose when the control handle is set to auto, and an overcurrent tripping section, and a front cover for the circuit breaker case. and a base and a back cover, the electromagnetic part, the control mechanism part, and the overcurrent tripping part are built in from the front cover side of the base, and the contact part is built in from the back cover side of the base, and The contact portion is isolated by an insulating wall.

Further, in the remote-controlled circuit breaker according to the present invention, an insulating wall is arranged to partition the inside of the base, and when the back cover is fixed to the base, the insulating wall and the mourning cover cover both side walls of the circuit breaker case. A communicating exhaust passage is formed, and exhaust holes are provided in each of the both side walls.

[Function] In this invention, when the control handle is set to the auto position, the control lever becomes idle, so the contact section can be opened and closed via the control lever by a remote-controlled electromagnetic section without passing through the control mechanism section, and the contact section can be opened and closed via the control lever without passing through the control mechanism 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.

Further, in this invention, since the contact portion is isolated by the insulating wall, the electromagnetic portion, the control mechanism portion, and the overcurrent tripping portion are not exposed to the arc of the contact portion.

Furthermore, in this invention, since the exhaust passage and the exhaust hole are provided, the exhaust of hot gas from the contact portion is facilitated.

[Embodiment 1] An embodiment of the present invention 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 a state where the control handle is auto and remote control is off. Figure 5 is a schematic diagram of Figure 1 showing a state where the control handle is auto and remote control is on. Schematic,
FIG. 6 is a schematic diagram of FIG. 1 showing a tripped state, and FIG. 7 is an exploded perspective view of the electromagnetic section.

In the figure, (5) is the circuit breaker case, and the front cover (5a
), a base (5b), and a back cover (5C). (6) is a power supply side terminal that is press-fitted into the base (5b) and is provided with a terminal screw (7) for connecting a tattle wire.

(8) is a power supply side stator held on the back side of the base (5b), one end of which is connected to the power supply side terminal (6) by a cable 7a). (9) is a power supply side fixed contact welded to the other end of the power supply side stator (8); (10) is a mover having a power supply side movable contact (11) 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 each type, and a movable element holder (13) is slidably fitted and housed in the groove (14a) of the crossbar. (14)
5) is a push spring that urges the mover (10) in the closing direction, and the spring receiver of the back cover (5C) is housed in the part (5d).

(1G) is a load-side fixed contact facing 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), which are surrounded by an insulating plate (18a) and an exhaust plate (18b) and have a grid (18c) made of a magnetic material. have. (19) is the base (5b)
and the back cover (5C).
An exhaust hole (20) is provided. Reference numeral (21) denotes a mounting bracket which is movably held on the back cover (5C) and urged rightward by a spring (22). Note that the crossbar (14) is connected to the upper part through the opening (23) of the base (5b).

Next, connect the power supply side terminal (6) rA on the front side of the base (5b).
I! 1, an electromagnetic part (200) is fixed to a base (5b) with a screw (24). This electromagnetic part (200)
is a mouth-shaped magnet frame (2) as shown in Figure 7.
5) Insert the electromagnetic coil (2G) into the hole (26a) of the coil (26) and the magnet frame (25) from the top.
), the legs (28) of the fixed iron core (28) to which the bear removal coil (27) is fixed are placed in the openings (25a) and (25b) of the
a) to (28c) are respectively inserted, and each elastic body (29) (
In this embodiment, a spring is inserted so that the fixed core (28) can be held back from the magnet frame (25) and the movable core (30) can absorb impact force. The movable iron core (30) is fixed to the holder (31) by a stopper (32), and bearings (31a) are provided at both ends of the holder (31), and each shaft (33) allows the transmission lever ( 34) is rotatably held by each bearing part (34a). Further, the transmission lever (34) is supported by a shaft (35) on the magnet frame (25),
The movable iron core (30) and the fixed iron core (28) are connected by each tension spring (36) applied between each projection (34b) of the transmission lever (34) and each projection (25C) of the magnet frame (25). It is biased in the direction of opening the space between the two.

In the figure, (37) and (38) are auxiliary switches, and screws (3
9).

(40) is fixed to the magnet frame (25), and each actuator (37a), (38
a) is arranged 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).

In addition, (41) in the figure is a 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 auxiliary switches (37),
It is connected to (38) by a lead wire (44) and is used as a terminal block for an auxiliary switch.
One of the terminals (42) in the two sets is a limit switch (
45) to the coil (26) and one of the ponds is connected directly to the coil (26).

That is, the limit switch (45) and the coil (2G) of the electromagnetic section (200) are connected in series. The limit switch (45) is attached to the magnet frame (25) with a screw (
4B> is fixed. The terminal screw (43) is exposed from the opening (47) of the front cover (5a) to the tab so that an external electric wire (not shown) can be connected thereto, and the terminal block (41) is connected to each fixed leg (47) of the front cover (5a). 41a) so that it can be fixed to the magnet frame (25). (
48) is a terminal cover that covers the terminal screw (4) of the terminal block (41).
3) should not be exposed to the outside unnecessarily.

Next, the control source structure (
300) are arranged. (49) is the base (5b)
Suspension bridge frame fixed by 49a), (5
0) is a control handle rotatably supported by a shaft (51) on a mechanism frame (49), which protrudes outside from an opening (52) of a front cover (5a) and can be operated manually; The internal protrusion (50a) is a pin (53)
is connected to the link (54) to form a toggle link mechanism. A roller (55) is attached to the other end of the link (54).
) 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 twist spring (not shown). (59) is a trip bar rotatably supported by a shaft (60) on the mechanism frame (49), biased clockwise by a twist spring (not shown), and latched by a latch (59).
7). (61) is a push plate that is held movably up and down in each U groove (49b) of the mechanism frame (49), is urged upward by a tension spring (62), and has a roller (55) on its upper end surface. together with the lever (5
6) is engaged. (63) is the mechanism frame (49)
A control lever rotatably supported by a shaft (64), one end (133a) engages with the crossbar (14) and the other end (G3b) engages with the locking portion (34C) of the transmission lever (34).
) and is also engaged in the hole (81a) of the push plate (61). In FIG. 1, the control handle (50) is in the off state, so the control lever (63) is moved upward to the push plate (
61) and is restrained by a bow spring (62). That is, since the load of the tension spring (62) is greater than the load of the push spring (15) that biases the movable element (10), the control lever (63) is held in the state shown in FIG. 1, and both contacts (9)
, (11).

(12), (1G) opens. 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), there is an overcurrent removal part (4) consisting of a bimetal and a plunger type NWA stone.
00) is placed. (65) is the first yoke,
A load side stator (17) is attached to one end (65a) with a screw (66).
) and are welded with bimetallic material (67) and provided with an adjusting screw (68). (69) is a bobbin, which is provided with a hollow core (70) and a plunger (11) that are caulked to the first yoke (65). The plunger (71) is urged upward by a detection push spring (72).

Further, the tip 1 (71a) of the plunger (71) is aligned with the U groove (59a) of the trip bar [59], and when the plunger (71) is sucked toward the core (70), the tip 1 (71a) of the trip bar (59) ) is rotated against the twisting spring. (7
3) is a rod, the hollow part of the core (70), the base (5b
) and the hole (14a) of the crossbar (14) to the movable element holder (10). Similarly, when the plunger (71) is attracted toward the core (70),
The plunger (71) hits the movable element holder (10) via the rod (73), and both contacts (9), (11),
(12).

(16) is released. (75) is the first yoke (65
) is caulked to the second yoke, (76) is a coil,
One end is a bimetal (67) with a flexible copper strand (77) attached to the tip.
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 an actuating piece that is rotatably supported by the first yoke (65) by a shaft (81), is biased counterclockwise by a spring (not shown), and is connected to the trip bar (59). Engaging arm (80
It has a). To adjust the trip time, use the adjustment screw (6
The tip of the bimetal (67) and the actuating piece (
80) by changing the gap between the two.

Next, the operation will be explained.

From the OFF state of the control handle (50) shown in Figures 1 to 3, tilt the control handle (50) to the right and set the control handle (50) to the auto position, as shown in Figure 4, the link ( 54) is extended and the push plate (C1) is pulled by the spring (
62) to release the control lever (63). The control lever (63) is connected to the contact portion (8) (17
) is rotated clockwise via the crossbar (14) by the push spring (15) of the electromagnetic part (200).
34) When there is no gap between the lever and the 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 movable element (10) rises as much as the gap between the transmission lever (34) and the control lever (63) disappears, and both contacts (
9), (11), (12).

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 not energized (remote off), the limit switch (45) detects the movement of the push plate (61) and is in the ON state. When voltage is applied to the terminal (42) from the top part,
The coil (26) is excited and the movable core (30) is attracted to the fixed core (28). In order to release the control lever (63) by rotating the transmission lever (34) together with the movable iron core (30) counterclockwise against the tension spring (36), the movable element (10) is moved by the push spring (15). , and both contacts (9), (11), (12), and (1G) close.

FIG. 5 shows when the handle is automatically energized (remotely turned on). At this time, the protrusion (31) of the holder (31)
b) Press the actuators (37a) and (38a) of the auxiliary switches (37) and (38), and turn the auxiliary switches (
37), operate the contact point (3B). In addition, the movable iron core (
30) suddenly collides with the fixed iron core (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 movable element (10) and opening both contacts (9), (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 (67) → Flexible copper stranded wire (77) → Coil (76) - Load side terminal (78)
It flows.

When an overcurrent flows in FIG. 5, the bimetal (67) bends to the right, rotates the trip bar (59) counterclockwise through the actuation piece (80) against the torsion spring, and latches. (57) in a clockwise direction against the twisting spring. Rotation of this latch (57) releases the lever (5G), so the push plate (61) pushes the roller (55) to the left side together with the lever (513) by the tension spring (62) and rises, causing the control lever ( 63) counterclockwise against the push spring (15), both contacts (
9), (11), (12), and (1f3) are opened. This trip state is shown in FIG.

At this time, the limit switch (45) is also
) rises, the coil (26) is de-energized, and the movable iron core (30) is opened in the same way as in the off operation, and both contacts (9), Transmit force in the direction of opening (11), (12), and (1B). That is, the contact portions (8) to (
Two spring loads, a tension spring (62) and a tension spring (36), act on 17), and both contacts (9), (11), (12) apply a very strong force to the push spring (15). ), (1
6) Release.

Next, in Fig. 5, when a short circuit current flows, the coil (7
6), the plunger (71) is instantly attracted in the direction of the core (70), and the trip bar (59) is rotated counterclockwise against the torsion spring, causing the mechanism to operate in the same way as when the bimetal (67) operates. At the same time, the plunger (71) directly hits the movable element holder (13) via the rod (73), causing both contacts (9), (11), (1
2), (16) is opened. The arc generated between the contacts moves between the mover (10) and each stator (8), (17), and then both arc runners (8).
2), (83) and each stator (8), (17), and is divided and extinguished by each grid (18C).

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 mentioned above, the insulating wall (
5A) and accommodate the contact parts (8) to (17), the contact parts (8) to (17) are isolated by the insulating wall (5A), so the electromagnetic part (200) and the control mechanism part ( 300)
and the overcurrent tripping section (400) are connected to the contact sections (8) to (17).
) will not be exposed to arcing, and insulation performance will not deteriorate.

Further, when the back cover (5C) is fixed to the base (5b), the insulating wall (5A) and the back cover (5C) form an exhaust passage (19) that leads to both side walls of the circuit breaker case (5).
In addition, since exhaust holes (20) are provided on each side wall, the hot gas generated in each arc extinguishing part (18A) and (18B) is discharged through the hole (not shown) in each exhaust plate (18b).
On the power supply side, it passes through an exhaust passage (19) and is discharged to the outside from an exhaust hole (20), and on the load side, it is discharged to the outside from an exhaust hole (20).

At this time, the pressure of the hot gas decreases due to the space that rapidly widens near the exhaust hole (20), and the melt is dispersed, so that the discharge of the hot gas is further promoted and the release of the 9F portion of the melt is facilitated. reduced.

Furthermore, the circuit breaker case (5) is composed of a front cover (5a), a base (5b), and a back cover (5C), and the base (5)
b) Incorporate the electromagnetic part (200), control component part (300), and overcurrent trip part (400) from the front cover (5a) side, and install the contact part into the base (5b) from the back cover (5C) side. If (8) to (17) are incorporated, assembly is easy,
Maintenance is also easy.

[Effects of the Invention] As described above, according to the present invention, it can be constructed compactly as a single component, and the remote-controlled electromagnetic section provides high-frequency and long-life opening/closing performance, and the control mechanism section provides N-shape By separating the overcurrent tripping section, high-speed breaking performance can be obtained by separating the overcurrent tripping section, and there is also the effect that deterioration of insulation performance due to arcing from the contact section can be prevented.

[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 the remote control off. Fig. 2 is a front view of Fig. 1 with the front cover partially removed. Figure 1 is a back view with the back cover partially removed, Figure 4 is a schematic diagram of Figure 1 showing the state in which the control handle is automatic and remote control is off, and Figure 5 is a state in which the control handle is automatic and remote control is on. FIG. 6 is a schematic diagram of FIG. 1 showing the trip state, FIG. 7 is an exploded perspective view of the electromagnetic part, FIG. 8 is a conventional operation system diagram of a three-phase induction motor, FIG. 9 is a diagram showing a 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, (5A)
is an insulating wall, (6) is a power supply side terminal, (8) to (17) are contact parts, (19) is an exhaust passage, (20) is an exhaust hole, (26) is an
) is the electromagnetic coil, (28) is the fixed core, (30) is the movable core, (34) is the transmission lever, (200) is the electromagnetic part, (
50) is a control handle, (63) is a control lever, (30) is a control handle;
0) is the control mechanism section, (400) is the overcurrent tripping section, (7
8) indicates the load side terminal. Note that the same reference numerals in the figures indicate the same or corresponding parts.

Claims (2)

[Claims] (1) It has a contact part, an electromagnetic part consisting of an electromagnetic coil, a fixed core, and a movable core, a control lever that transmits the operation of the movable core to the contact part, and an externally operable control handle, and a control mechanism section that holds the control lever in the contact section OFF state when the control handle is turned off, and leaves the control lever idle when the control handle is turned OFF so that the operation of the movable iron core is transmitted to the contact section, and an overcurrent; the circuit breaker case is configured with a front cover, a base, and a back cover, and the electromagnetic section and the control mechanism section are connected from the front cover side of the base. and the overcurrent tripping portion, the contact portion is incorporated from the back cover side of the base, and the contact portion is further isolated by an insulating wall. (2) An insulating wall is arranged to partition the inside of the base, and when the back cover is fixed to the base, the insulating wall and the back cover form an exhaust passage leading to both side walls of the circuit breaker case, and 2. A remotely controlled circuit breaker as claimed in claim 1, each having an exhaust hole.