JP2001307615A - Insufficient voltage device for circuit breaker - Google Patents

Abstract

PROBLEM TO BE SOLVED: To improve an operation property of an insufficient voltage trip device attached to a circuit breaker in re-close of the circuit breaker after a trip action. SOLUTION: An insufficient voltage trip device 2 is provided with an electromagnet 5 excited by voltage of a main circuit, a trip lever 7 connecting the electromagnet 5 and a trip mechanism of a circuit breaker 1, a quick close contact mechanism inserted in an electric power supply circuit for the electromagnet 7, and an auxiliary handle 8 moving the quick close contact mechanism and an operation handle 1b to an 'ON' position. The operation handle 1b is moved from a 'TRIP' position to a 'RESET' position after trip action, and then the operation handle 1b is moved to the 'ON' position by operation of the auxiliary handle 8 to re-close the circuit breaker 1. A reset auxiliary handle 10 combined with a drive spring 11 for forcedly moving the operation handle 1b from the 'TRIP' position to the 'RESET' position is added in line with the auxiliary handle 8. A series of re-close operation, thereby, can be done by one hand.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a circuit breaker for wiring,
The present invention relates to an undervoltage trip device which is an accessory device (optional accessory) of a circuit breaker for an earth leakage breaker and the like.

[0002]

2. Description of the Related Art The circuit breaker described above is provided with various accessory devices as optional items, one of which is an undervoltage trip device. This undervoltage trip device is mounted on the main body of the circuit breaker, and trips the circuit breaker when the main circuit voltage drops abnormally during energization.The unit case is connected to the main circuit power supply side of the circuit breaker. An electromagnet that is connected and excited, a trip lever that connects the electromagnet and a trip mechanism of the circuit breaker body, a quick-entry contact mechanism inserted in an energizing circuit of the electromagnet, the quick-entry contact mechanism, and a circuit breaker After the tripping operation of the circuit breaker, the operation handle is moved from the trip position to the reset position to reset the trip mechanism of the breaker body. In this state, the auxiliary handle is pushed in to close the energizing circuit of the electromagnet, and then the operation handle of the circuit breaker body is moved to the ON position. Configuration have been known which is adapted to be re-charged.

Next, the conventional structure and operation of the undervoltage trip device mounted on a circuit breaker will be described with reference to FIGS.
First, in FIGS. 3 (a) and 3 (b), reference numeral 1 denotes a circuit breaker, and 2 denotes an undervoltage trip device as an attached device mounted on the side surface of the circuit breaker body case 1a. As is well known, the circuit breaker 1 has a case 1a in which a breaking part of a main circuit, an opening / closing mechanism, an overcurrent tripping part, and the like are incorporated. Further, the upper surface of the case 1a is connected to the opening / closing mechanism. Operation handle 1b. The operation handle 1b is a tumbler-type handle that tilts left and right about the support shaft 1b-1 (see FIGS. 4 to 6). The ON position is tilted to the left, the OFF position is tilted to the right, and tripping of the circuit breaker is performed. A neutral TRIP position indicating the operation state is set.

As shown in FIGS. 4 to 6, the opening / closing mechanism of the circuit breaker main body includes a latch 1c, a latch receiver 1d for restraining and releasing the latch 1c, and an undervoltage trip device 2.
A trip mechanism comprising a trip plate 1e connected to the trip lever and a return spring 1f is assembled. On the other hand, the undervoltage trip device 2 has an auxiliary terminal 4, an electromagnet 5, and a quick-entry contact mechanism 6 inserted in an energizing circuit of the electromagnet 5 in the unit case 3, and connects between the electromagnet 5 and the trip mechanism of the circuit breaker body. A trip portion is connected to the trip lever 7 and the guide groove 3a formed in the unit case 3, and the leg portion is inserted above the operation handle 1b of the breaker body (corresponding to the ON position).
The auxiliary handle 8 is provided so as to be guided and supported so as to protrude therefrom.

The trip lever 7 is urged downward via a return spring 7a, and a pin protruding laterally from the upper end of the lever is provided with a trip plate 1e of the circuit breaker body.
Is engaged with the shoulder. Further, the movable contact 6a of the early entry contact mechanism 6 is supported by a swingable contact holder 6b having a lower end as a fulcrum, and a rotating lever 9 is connected to the upper end of the holder.
A pin 9a attached to the other end of the rotary lever 9 is fitted into an L-shaped groove 8a formed on the inner surface of the auxiliary handle 8, and when the auxiliary handle 8 is pushed in, the rotary lever 9 rotates counterclockwise. Then, the contact holder 6b is pushed rightward so that the movable contact 6a of the early entry contact mechanism 6 comes into contact with the fixed contact. In addition,
The electromagnet 5 connects the auxiliary terminal 4 between the phases of the main circuit on the power supply side of the circuit breaker 2 so as to be excited by the main circuit voltage.

With such a configuration, when the circuit breaker 1 is turned on in which the auxiliary handle 8 is pushed and the operation handle 1b is turned to the ON position, the quick-start contact mechanism 6 of the undervoltage trip device 2 is closed, The electromagnet 5 is excited by the main circuit voltage. Here, if the main circuit voltage is normal, the electromagnet 5 attracts and holds the armature 5a, and pushes the tripping lever 7 upward against the return spring 7a.

If the main circuit voltage drops abnormally for some reason in this energized state, the attractive force of the electromagnet 5 decreases, and the trip lever 7 moves down by the spring force of the return spring 7a.
The trip plate 1e of the circuit breaker body is pushed down against the return spring 1f. As a result, the latch 1c is disengaged from the latch receiver 1d, and the opening / closing mechanism trips to open the main circuit contact. When the opening / closing mechanism is tripped, the operation handle 1b moves from the ON position to the TRIP position shown in FIG. 4 in conjunction with the trip operation, and the auxiliary handle 8 moves upward following this movement. The incoming contact mechanism 6 is also turned off and the energization of the electromagnet 5 is cut off.

On the other hand, the procedure for turning on the circuit breaker after the main circuit voltage is recovered after the trip operation of the circuit breaker 1 is performed as follows. First, the operating handle 1b of the circuit breaker main body is pushed from the TRIP position to the RESET position (same as the OFF position) shown in FIG. 5 by manual operation to move the latch 1c of the opening / closing mechanism to the reset position. In addition,
In this state, since the trip lever 7 of the undervoltage trip device 2 is lowered to push down the trip plate 1e of the circuit breaker body, the latch mechanism of the circuit breaker body is not completely reset, and the operation handle 1b is not operated. When the hand is released, the handle returns to the trip position due to the spring force of the opening / closing mechanism.

Next, while holding the operation handle 1b at the RESET position, as shown in FIG.
0, the operation handle 1b is moved from the RESET position to the ON position. When the handle is moved from the solid line position in FIG. The above-described rotating lever 9 rotates counterclockwise to push the contact holder 6b rightward, the early entry contact mechanism 6 is reset to the ON position, and the electromagnet 5 is energized. As a result, the armature 5a is sucked and the tripping lever 7 is pushed up to the standby position. On the circuit breaker main body side, the latch 1c and the latch receiver 1d are engaged and the main circuit contacts can be turned on. Is held at the RESET position even if is released. When the auxiliary handle 8 is pushed from the half-pressed position to the fully-pressed position II as shown in FIG. 6, the operation handle 1b of the circuit breaker main body moves to the ON position, and the opening and closing mechanism interlocked therewith. The main circuit contact closes and the circuit breaker 1
Is re-introduced.

[0010]

However, the conventional configuration of the undervoltage trip device has the following problems in operability when the circuit breaker is turned on again after the trip operation. That is, as described with reference to FIGS. 4 to 6, in the conventional configuration, after the operating handle 1b of the circuit breaker main body is moved from the trip position to the reset position, the auxiliary handle 8 is half-pressed to release the electromagnet 5 of the undervoltage trip device 2. Until the energization circuit is closed, it is necessary to use both hands to push the auxiliary handle 8 with the other hand while holding the operation handle 1b at the reset position with one hand. Moreover, in this case, the operation handle 1b is reset.
If it is not securely pushed into the position, or if it is held in the RESET position but loosened, erroneous operations such as the latch mechanism of the circuit breaker body not being properly engaged may occur.

SUMMARY OF THE INVENTION The present invention has been made in view of the above problems, and an object of the present invention is to solve the above-mentioned problems, and to easily turn on a circuit breaker again with a simple operation using only one hand without using both hands, without fear of erroneous operation. An object of the present invention is to provide an undervoltage trip device for a circuit breaker, which is improved so that it can be operated to improve operability.

[0012]

According to the present invention, there is provided, in accordance with the present invention, an undervoltage trip device which is used by being attached to a circuit breaker body as an auxiliary device of a circuit breaker, the unit comprising: An electromagnet connected to the main circuit power supply side of the circuit breaker to energize the case, a trip lever connected between the electromagnet and the trip mechanism of the circuit breaker main body, a quick-entry contact mechanism inserted in the energizing circuit of the electromagnet, The quick entry contact mechanism and the auxiliary handle for operating the operation handle of the circuit breaker main body to the ON position are mounted. After the tripping operation of the circuit breaker, the operation handle is moved from the trip position to the reset position, After closing the energizing circuit of the electromagnet by the pushing operation of the auxiliary handle, move the operating handle of the circuit breaker body to the ON position and then turn it on again. In a preferred embodiment, a reset auxiliary handle for moving an operation handle of the circuit breaker main body from a trip position to a reset position is provided in the unit case in parallel with the auxiliary handle (claim 1). The auxiliary handle is biased by a drive spring, and after the tripping operation of the circuit breaker, the operating handle of the circuit breaker body is automatically forcibly moved from the trip position to the reset position by the bias of the spring. 2).

According to this configuration, after the tripping operation, the operation handle of the circuit breaker main body is temporarily moved from the trip position to the reset position, and further, a series of operations of moving from the reset position to the on position are performed by a simple one-handed operation. The circuit breaker can be reliably turned on again. In this case, if the reset auxiliary handle is biased by the drive spring, the operation handle of the breaker body automatically moves from the trip position to the reset position after the trip operation, and is held at this reset position. You. Therefore, in order to re-enter the circuit breaker, it is only necessary to slightly push the auxiliary handle to move the operation handle of the main body from the reset position to the ON position, thereby improving operability and reliably preventing erroneous operation.

[0014]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments of the present invention will be described below with reference to the embodiments shown in FIGS. In the drawings of the embodiment, members corresponding to FIGS. 3 to 6 are denoted by the same reference numerals, and the description thereof will be omitted. That is, in the undervoltage trip device 2 of the illustrated embodiment, a reset auxiliary handle 10 is additionally provided as compared with the conventional configuration shown in FIG. The resetting auxiliary handle 10 is a swing type handle that supports a shaft portion 10a formed at the base of the resetting auxiliary handle 10 in a bearing portion inside the unit case 3 so as to swing vertically. 8 so as to extend from the upper surface of the unit case 3 to the side of the operation handle 1b of the circuit breaker main body, and to bend the end thereof into an L-shape to push the operation handle 1b toward the RESET position from above. It is a confronted configuration. Also, unit case 3
The drive spring 11 of the reset auxiliary handle 10 is incorporated in the device, and the tip of the reset auxiliary handle 10 is urged downward (clockwise) by the spring force of the drive spring 11.
A force is applied to push the operation handle 1b of the circuit breaker body to the RESET position. When the circuit breaker 1 trips, the operating handle 1b of the breaker body is moved from the TRIP position to the
The spring force is set so as to forcibly move to the T position and hold it at this position. In addition, in the closed state of the breaker body,
The operating handle 1b is turned O by the strong opening / closing spring force of the opening / closing mechanism.
The reset auxiliary handle 10 is held at the N position.
Does not reversely move to the RESET position.

Next, the operation procedure of re-closing after the tripping operation of the circuit breaker according to the above configuration will be described with reference to FIGS. 1 (a) to 1 (c). First, FIG. 1A shows a state immediately after the circuit breaker trips, and the operation handle 1b of the circuit breaker main body moves to the TRIP position described in FIG. In this trip state, the reset auxiliary handle 10 abutting on the operation handle 1b pushes the operation handle 1b with the spring force of the drive spring 11, and the reset handle shown in FIG.
Forcibly move to the T position. Thereby, the trip mechanism (latch 1c) of the circuit breaker main body moves to the reset position.

Subsequently, the other auxiliary handle 8 is manually pushed in, and the auxiliary handle 8 is moved in FIG.
The half-pressed position I (operation handle 1b)
When it comes down to a position where the contact is almost in contact with the undervoltage trip device 2 as shown in FIG.
Is switched from OFF to ON to form an energizing circuit for the electromagnet 5. As a result, the armature 5a of the electromagnet 5 pushes the tripping lever 7 to the standby position, and the tripping plate 1e of the circuit breaker main body is driven by the armature 5a.
As a result, the latch 1c and the latch receiver 1d are engaged with each other, and the circuit breaker main body is ready for closing. And
When the auxiliary handle 8 is further pushed from the half-pressed position I to the fully-pressed position II shown in FIG. 1 (c), the main circuit contact is closed via the opening / closing mechanism and the circuit breaker is turned on again.

In the illustrated embodiment, the operating handle 1b of the breaker body is forcibly moved from the TRIP position to the RESET position by combining the reset auxiliary handle 10 with the driving spring 11, but this driving spring 11 is omitted. The auxiliary handle for resetting may be manually operated, and in this case, since the auxiliary handles 8 and 10 are arranged in the same place, the circuit breaker can be turned on again with only one hand without using both hands. Can be done by operation.

[0018]

As described above, according to the configuration of the present invention, the operating handle of the circuit breaker body is reset from the trip position by juxtaposing the auxiliary handle for ON operation in the unit case of the undervoltage trip device. With the addition of a reset auxiliary handle that moves to the position, a series of operations for re-closing the circuit breaker after the trip operation can be performed reliably with only one hand, without using both hands as in the past. Operability is improved.

Further, a drive spring is combined with the resetting auxiliary handle as in claim 2 of the present invention, so that the operation handle of the circuit breaker main body is forcibly moved from the trip position to the reset position after the circuit breaker is tripped. By doing so, it is possible to provide an undervoltage trip device for a circuit breaker that is excellent in operability such that operability is further improved and erroneous manual operation, which is a problem in the conventional device, can be prevented.

[Brief description of the drawings]

FIG. 1 is an explanatory view of the operation of an undervoltage trip device according to an embodiment of the present invention, wherein (a), (b) and (c) show trips and resets of a circuit breaker with an undervoltage trip device, respectively. ,
Diagram showing ON state

2 is an overall configuration diagram of the undervoltage trip device shown in FIG. 1, wherein (a) and (b) are a side view and a plan view, respectively, showing an internal mechanism.

FIG. 3 is a conventional overall configuration diagram of an undervoltage trip device mounted on a circuit breaker, wherein (a) and (b) are a side view and a plan view, respectively, showing an internal mechanism.

FIG. 4 is a diagram showing a trip state of a circuit breaker in the configuration of FIG. 3;

FIG. 5 is a diagram showing a reset state in which the operation handle of the circuit breaker is moved from the trip position to the reset position in the configuration of FIG. 3;

FIG. 6 is a diagram showing an ON state in which the operation handle of the circuit breaker is moved from a reset position to an ON position in the configuration of FIG. 3;

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Circuit breaker 1b Operation handle 1c Latch 1d Latch receiver 1d Tripping plate 2 Undervoltage tripping device 3 Unit case 5 Electromagnet 5a Armature 6 Quick entry contact mechanism 7 Tripping lever 8 Auxiliary handle 10 Auxiliary handle 11 Reset spring 11 Drive spring

 ──────────────────────────────────────────────────続 き Continuation of the front page (72) Inventor Koji Asakawa 1-1-1, Tanabe-Nitta, Kawasaki-ku, Kawasaki-city, Kanagawa Prefecture Inside Fuji Electric Co., Ltd. No. 1 Fuji Electric Co., Ltd. F-term (reference) 5G030 AB00 FC05 XX04

Claims (2)

[Claims] An undervoltage trip device attached to a circuit breaker body as an auxiliary device of a circuit breaker, and an electromagnet connected to a main circuit power supply side of the circuit breaker in a unit case thereof for excitation. The trip lever connecting the electromagnet and the trip mechanism of the circuit breaker main body, the quick-entry contact mechanism inserted in the energizing circuit of the electromagnet, the quick-entry contact mechanism, and the operation handle of the circuit breaker main body moved to the ON position. After the tripping operation of the circuit breaker, the operation handle is moved from the trip position to the reset position, and the energization circuit of the electromagnet is closed by the pushing operation of the auxiliary handle. Further, when the operation handle of the circuit breaker main body is moved to the ON position and re-inserted, the unit case is juxtaposed with the auxiliary handle. Scan undervoltage trip device of the circuit breaker to the operating handle of the circuit breaker body from the trip position wherein an equipped with resetting the auxiliary handle is moved to the reset position to the. 2. The undervoltage trip device according to claim 1, wherein a driving spring is combined with the auxiliary handle for resetting, and after the tripping operation of the circuit breaker, the operation handle of the circuit breaker body is forcibly moved from the trip position to the reset position. An undervoltage trip device for a circuit breaker, wherein the undervoltage trip device is characterized in that: