KR101258534B1 - Auxiliary device of circuit breaker - Google Patents

Abstract

A circuit breaker accessory with an external operation handle device and an undervoltage tripping device as an option.The undervoltage tripping device is divided into two modules, an electromagnet tripping unit 7 and an early closing contact unit 8. In other words, the tripping unit 7 is internally set in the case 1e of the circuit breaker 1. In addition, the early closing contact unit 8 is externally attached to the base 3 of the external operating handle device 2 to link the limit switch 8a of the early closing contact to the slide base 6 of the external operating handle device, Optional specification with early closing contact function by closing the early closing contact in advance in the stroke before the main circuit contact of the circuit breaker 1 closes during the ON operation of the rotary handle 4 of the external operating handle device 2. To match.

Description

Accessories for circuit breakers {AUXILIARY DEVICE OF CIRCUIT BREAKER}

BACKGROUND OF THE INVENTION 1. Field of the Invention [0001] The present invention relates to a circuit breaker for a low voltage power distribution facility and an accessory device for a circuit breaker targeting an earth leakage breaker. More specifically, an undervoltage tripping device and an external operation handle attached to a circuit breaker as the accessory device. It relates to the configuration of the device.

As is well known, the circuit breaker described above is provided with various kinds of accessories as an option, and one of them is an undervoltage tripping device.

In this undervoltage tripping device, the voltage of the circuit to be protected (the voltage of the main circuit and the control circuit) is less than the predetermined voltage (for example, the range of 85 to 35% of the rated voltage). When the circuit breaker is tripped, the main circuit is disconnected. As an example, the built-in undervoltage tripping device which is inserted and used inside the case of a circuit breaker is known (for example, refer patent document 1).

The built-in undervoltage tripping device includes an electromagnet, an actuator coupled to the electromagnet armature and replaced with a tripping crossbar of the circuit breaker in a cassette case embedded in the casing of the circuit breaker, a release spring of the armature, and The tripping mechanism consisting of the assembly of the reset lever connected to the armature is mounted.

The operation and function of such an undervoltage tripping device are described in detail in Patent Document 1, and the electromagnet coil is energized by a control circuit which uses the main circuit of the circuit breaker as a power source. Suction and keep the actuator in the retracted position. On the other hand, when the voltage of the main circuit falls beyond the prescribed range, the suction force of the electromagnet decreases, and the restraint of the actuator is released. As a result, the actuator receives a spring bias of the release spring, and the actuator taps the tripping crossbar to trip the circuit breaker.

Then, when the handle of the circuit breaker is inserted into and operated from the OFF to ON position after the tripping operation, the reset lever of the undervoltage tripping device resists the release spring to return the actuator to the retracted position in conjunction with this. In this state, if the main circuit voltage is recovering to the range of the specified voltage, the electromagnet attracts the armature and holds the actuator in the retracted position, thereby re-inserting the circuit breaker.

As an undervoltage tripping device of a circuit breaker, there is also known an undervoltage tripping device having an early closing contact in which an early closing contact switch is combined with the tripping mechanism, and the early closing contact is connected to a power supply circuit of an electromagnetic coil. (For example, refer patent document 2).

The undervoltage tripping device provided with the early closing contact is configured to safely and accurately input the circuit breaker, and has a configuration in which the early closing contact switch mechanism is provided in parallel with the tripping mechanism including the electromagnet. Is connected to the early closing contact switch mechanism via a drive lever (cam type lever) or the like provided in the handle of the circuit breaker.

If the handle of the circuit breaker stopped at the TRIP position is returned to the OFF position and then moved to the ON position during the handle operation to re-insert the circuit breaker after the tripping operation, the main circuit contact of the circuit breaker closes early before closing. The contact is closed to energize the electromagnet coil. At this time, if the voltage of the main circuit is restored to the voltage in the prescribed range, the electromagnet armature of the tripping mechanism is attracted and holds the actuator in the retracted position. Thus, when the handle is moved to the ON position, the reinsertion of the circuit breaker is established. On the other hand, if the main circuit voltage does not recover to the specified voltage, the electromagnet armature is not attracted, and therefore, even if the handle is moved to the ON position, the circuit breaker does not reset and returns to the tripping state.

In addition, the undervoltage tripping device having an early closing contact is large in size compared to the built-in undervoltage tripping device disclosed in Patent Document 1, and since it is difficult to be assembled in the case of the circuit breaker as it is, it is usually patented. As in Document 2, the unit case is externally attached to the side of the circuit breaker case, and then the premature closing contact switch mechanism is connected through a driving lever attached to the rotary handle of the circuit breaker.

On the other hand, the above-mentioned circuit breaker (wiring breaker, earth leakage breaker) is generally installed and used in a panel such as a wiring board, a distribution board, a control panel, and the like. There is an external operation handle device that opens and closes from the front. As one example, a method of driving a rocker handle of a circuit breaker to the ON, OFF, and RESET positions by operating a rotary handle equipped with an external operation handle device is known (for example, a patent document). 3).

Next, the structure of the conventional example of the said external operation handle apparatus is demonstrated by FIG. In Fig.8 (a)-(c), 1 is a circuit breaker (wiring breaker), 2 is an external operation handle apparatus attached to the case of a circuit breaker as an accessory device of the circuit breaker 1. As shown in FIG. Here, the circuit breaker 1 is the opening / closing mechanism part 1d which consists of the fixed contactor 1b, the movable contactor 1c, and the reverse operation toggle link mechanism in the case 1a, and the said opening / closing mechanism part 1d. The rocker handle 1e, the overcurrent tripping device 1f, etc. which were arrange | positioned at the upper part of the case 1a in connection with this, are equipped with the structure. In addition, 5a is a name plate which shows the ON, OFF, TRIP, and RESET positions of the handle 4.

The opening / closing operation of the circuit breaker 1 is as known. When the rocker handle 1e is moved from the ON position shown to the right to the OFF position, the opening / closing mechanism part 1d is reversed in the middle of the stroke. The movable contact 1c opens by receiving the force of the opening / closing spring of the opening / closing mechanism part 1d. In addition, when the overcurrent tripping device 1f is operated by detecting the overcurrent of the main circuit, the opening / closing mechanism 1d is released, and the movable contact 1c opens and cuts off the main circuit current. In addition, by this tripping operation, the rocker handle 1e moves to an intermediate position between the ON position and the OFF position to display the tripping operation state.

On the other hand, the external operation handle device 2 is a rotary handle 4, a handle cover 5 and a slide base 6 to a base 3 which is screwed and fixed to an upper part of the case 1a of the circuit breaker 1. It becomes the structure which mounted such drive components, and the turning base 4b connected to the support shaft 4a of the rotary handle 4 is equipped with the crank pin 4c. In addition, the slide base 6 is slidably guided in a direction parallel to the rocker handle 1e of the circuit breaker 1, and the plate surface has a long hole in a direction orthogonal to the slide direction. 6a) is opened, and the said crank pin 4c is inserted in this long hole 6a, and the rotary handle 4 is connected. Further, the slide base 6 has a handle portion of the rocker handle 1e protruding from the case 1a of the circuit breaker 1 in a state where the external operation handle device 2 is attached to the circuit breaker 1. It is provided with the pusher 6b which opposes and opposes from the ON side, and the biasing spring 6c which presses the said pusher 6b toward the handle part of the handle 1e from behind.

In the above configuration, when the rotary handle 4 is turned from the ON position to the OFF position by manual operation, the slide base 6 slides to the right through the crank pin 4c, and the circuit breaker is pushed through the pusher 6b. The rocker handle 1e of (1) is driven toward the OFF position. Here, when the handle 1e is displaced to approximately an intermediate position of the moving stroke, the toggle link mechanism of the opening / closing mechanism part 1d provided in the circuit breaker 1 reverses. As a result, the movable contact 1c opens from the fixed contact 1b and moves to the open end position, so that the circuit breaker 1 is turned off.

When the circuit breaker 1 detects an overcurrent and trips, the handle 4 of the external operation handle device 2 associated with the rocker handle 1e moves to the TRIP position between the ON position and the OFF position and stops. . Then, to re-insert the circuit breaker 1 in this state, the rotary handle 4 is first turned to the RESET position. Accordingly, the tripping mechanism associated with the opening / closing mechanism portion 1d of the circuit breaker 1 is reset, and when the rotary handle 4 is inverted and turned to the ON position, the rocker handle 1e of the circuit breaker 1 is turned OFF. Moving to the position, the movable contact 1c comes in contact with the fixed contact 1b and the input of the circuit breaker 1 is established.

Japanese Patent Laid-Open No. 10-255639 Japanese Patent Publication No. Japanese Laid-Open Patent Publication No. 2007-134148 (Figs. 7-8).

By the way, the conventional undervoltage tripping device and the external operation handle device prepared by the manufacturer as an accessory device of the circuit breaker have the following problems in response to the user-specified option specification.

That is, various accessory devices prepared by the manufacturer as an option of the circuit breaker are employed in response to the protection system of the power distribution equipment and the user's designation. In this case, about the option of the undervoltage tripping device, as mentioned above, the normal built-in undervoltage tripping device (refer patent document 1) which does not have an early closing contact mechanism, and the undervoltage tripping provided with an early closing contact. There is a type of device (see Patent Document 2), and the specification also depends on the type of circuit breaker, rated voltage, and the like. In addition, there are cases where an external operation handle device is used in combination with the circuit breaker, and the type of the accessory device used varies depending on the use environment of the circuit breaker, the user's designation, and the like.

For this reason, the manufacturer of the circuit breaker needs to prepare a low voltage tripping device of many models having different models and specifications in preparation for the option specified by the user, and there is a cost for inventory management of the option.

Moreover, when the undervoltage tripping device (refer patent document 2) provided with the above-mentioned early closing contact as an accessory of a circuit breaker is used, the circuit breaker is exclusively provided with the drive lever connected to an early closing contact switch mechanism. It is necessary to equip the rotary handle.

However, since the conventional circuit breaker (refer FIG. 8) is equipped with a rocker handle as a standard, when employing an undervoltage tripping device with an early closing contact, it is necessary to use a circuit breaker of a model having a dedicated rotary handle. There is. In addition, in order to cope with an undervoltage tripping device having an early closing contact, if the circuit breaker is equipped with the above-mentioned dedicated rotary handle in advance, the excess voltage tripping device having an early closing contact is not used. There is also a problem that the product price of the circuit breaker becomes expensive due to the specification of.

SUMMARY OF THE INVENTION The present invention has been made in view of the above, and in the undervoltage tripping device to be applied to a circuit breaker, an option related to the undervoltage tripping device is separated into a plurality of units, and the user-specified option It is an object of the present invention to provide an accessory device for a circuit breaker in which the above-described unit selected according to the specification is used in a circuit breaker so that the specification of various designated options can be easily supported.

In order to achieve the above object, the accessory of the circuit breaker according to the embodiment of the present invention is an accessory of the circuit breaker provided with an external operation handle device and an undervoltage tripping device as an accessory device. The tripping device is separated into two modules, a tripping unit with a tripping mechanism and an early closing contact unit with an early closing contact, and the tripping unit is incorporated in a case of the circuit breaker. And the early closing contact unit is externally attached to an external operation handle device to link the early closing contact to an internal mechanism of the external operation handle device, and the main circuit contact of the circuit breaker is turned on during the ON operation of the external operation handle device. The premature closing before closing is to close the early closing contact point.

In addition, the accessory of the circuit breaker according to an embodiment of the present invention, the external operation handle device, the base is attached to the case of the circuit breaker, the rotary handle, the rotation of the handle in a linear movement Slide base for driving the rocker handle of the circuit breaker in the ON and OFF directions, and a pusher mounted on the slide base to replace the rocker handle from the ON operation direction. ) And a spring for biasing the pusher from behind, and a backlash stroke is set between the slide base and the pusher, and a closing operation process of the circuit breaker is provided. Detects the movement of the slide base corresponding to the backlash stroke at the early closing contact of the early closing contact unit To operate the opening and closing.

In addition, the accessory of the circuit breaker according to the embodiment of the present invention, the early closing contact unit of the frame provided with a limit switch (limit switch) having the early closing contact, and the terminal holding the limit switch It is made of an assembly, and the frame is detachably attached to the base of the external operation handle device, and the operation end of the limit switch is connected to the slide base of the external operation handle device at the attachment position.

According to the accessory of the circuit breaker according to the present invention, as the accessory of the circuit breaker, the undervoltage tripping device is constituted as described above, and various designations are made by appropriately selecting a minimum kind of option and applying it to the circuit breaker. It can easily cope with an optional specification.

That is, when the conventional undervoltage tripping device which does not have an early closing contact function as an accessory device of the circuit breaker is applied, it can respond immediately by incorporating the tripping unit in the case of the circuit breaker. In this case, an external operation handle device can be attached to the circuit breaker as needed.

On the other hand, as an undervoltage tripping device, when the optional specification is changed to one equipped with an early closing contact function, the existing tripping unit described above is useful as it is and built into the case of the circuit breaker. It can be easily responded by adding an optional accessory and attaching it externally to an external operation handle device mounted on a circuit breaker. Therefore, the manufacturer of the circuit breaker only needs to prepare fewer types of options than in the prior art, and can significantly reduce the cost required for inventory and management of the options.

1 is an exploded perspective view of an embodiment of the present invention in which a circuit breaker is equipped with an external operation handle device and an accessory device for an undervoltage tripping device.
FIG. 2 is a configuration diagram of an undervoltage tripping device having an early closing contact applied to the circuit breaker of FIG. 1, wherein (a) and (b) are perspective views of the tripping unit and the early closing contact unit, respectively.
Fig. 3 is an assembly structure diagram of the external operation handle device in Fig. 1, wherein (a) is an exploded perspective view of the entire apparatus, and (b) is an exploded perspective view of the slide base in (a).
FIG. 4 is a view showing an operating state of the external operation handle device shown in FIG. 3, wherein (a) and (b) are perspective views showing a state where the handle is turned to the ON and OFF positions, respectively.
5 is an external perspective view of a use state in which the early closing contact unit of FIG. 2 is externally attached to the external operation handle device of FIG. 3 and mounted on a circuit breaker.
FIG. 6 is an external perspective view of a use state excluding the early closing contact unit in FIG. 5; FIG.
Fig. 7 is an operation explanatory view of the handle operation in the use state of the early closing contact unit of Fig. 5, wherein (a) to (d) are the handles when the handle of the external operation handle device is rotated from the OFF position to the ON position, respectively. (E)-(h) show the transition of the operation of the slide base, the pusher, the rocker handle of the circuit breaker and the early closing contact unit corresponding to (a)-(d), respectively. to be.
Fig. 8 is a structural diagram of a use state in which a conventional external operation handle device is mounted on a circuit breaker, (a) is a perspective view, (b) is a plan view, and (c) is a perspective view showing an internal mechanism of the external operation handle device. .

EMBODIMENT OF THE INVENTION Hereinafter, embodiment which concerns on this invention is described based on FIG. In addition, in the figure of this embodiment, the same code | symbol is attached | subjected to the member corresponding to FIG. 8, and the description is abbreviate | omitted.

First, Fig. 1 shows an embodiment of the present invention in which a circuit breaker is equipped with an external operation handle device and an accessory device for an undervoltage tripping device. In the drawing, 1 is a circuit breaker having a rocker handle 1e on the top of the case 1a, 2 is an external operation handle device, 7 is an undervoltage tripping device built in the case 1a of the circuit breaker 1. 8, the closing unit of the undervoltage tripping device, which is detachably externally attached to the rear surface side of the base 3 of the external operation handle device 2 and disposed between the circuit breaker 1 to be.

Here, the tripping unit 7 has a structure in which a tripping mechanism including the same electromagnet as in Patent Document 1 described above is mounted on a cassette type unit case as shown in Fig. 2A. In addition, 7a is an actuator which protrudes from the unit case and replaces the tripping crossbar of the circuit breaker, and 7b is a reset lever. On the other hand, the early closing contact unit 8 is an assembly of a limit switch 8a having an early closing contact and an attachment frame 8b holding the limit switch 8a, as shown in Fig. 2B. The attachment frame 8b includes a pair of support legs 8e (snap fits) projecting upward from both ends of the external connection terminal 8c, the terminal screw 8d, and the attachment frame 8b. Equipped with.

In addition, the external operation handle apparatus 2 shows the detailed structure in FIG. 3 with the structure substantially the same as the conventional external operation handle apparatus shown in FIG. That is, the slide base 6 mounted on the base 3 of the external operation handle device and guided and supported in a linear direction has a groove 6b- of the turning base 4b with a pin 6d, which is planted and installed on the upper surface side thereof. 1), it is connected to the rotary handle 4 via the support shaft 4a. Further, a U-shaped window hole 6e is cut out and opened in the plate surface of the slide base 6, and a backlash stroke is set between the window hole 6e and the slide base 6 as described later. The pusher 6b which replaced the rocker handle 1e (refer FIG. 1) of the circuit breaker 1 from the ON side, and the spring 6c (coil spring) whose spring force which adds the said pusher 6b from the back are weak. It is assembled. In addition, on the side surface along the moving direction of the slide base 6, the cam which functions as a dog which opens and closes the limit switch 8a (refer FIG. 2 (b)) of the early closing contact unit 8 mentioned above. The groove 6f is formed.

4 (a) and 4 (b) show the assembling state of the external operation handle device 2, and when the rotary handle 4 is manually turned to the ON and OFF positions, it interlocks with the handle 4 The slide base 6 slides in a linear direction to drive the rocker handle 1e of the circuit breaker 1 to the ON and OFF positions as described in FIG. 8.

In addition, Fig. 5 shows an external operation handle device 2 attached to a circuit breaker 1 (not shown in the drawings, but in which the tripping unit 7 of the undervoltage tripping device described above is built-in) in the case of the circuit breaker. Fig. 3 shows the state of use in which the early closing contact unit 8 of the undervoltage tripping device is additionally equipped. Here, the early closing contact unit 8 includes a locking hole 3e in which the support leg 8e provided in the frame 8b is drilled in the base 3 of the external operation handle device 2 (see FIG. 1). It is pushed in from the back side and attaches snap fitting detachably. Moreover, in this assembly state, the terminal 8c of the early closing contact unit 8 is connected to the exciting circuit of the electromagnet coil built in the tripping unit 7. 6 shows a use state in which the tripping unit 7 is internally set in the case of the circuit breaker 1 without using the early closing contact unit 8.

That is, the undervoltage tripping device is divided into two optional parts of the tripping unit 7 and the early closing contact unit 8, so that the undervoltage tripping device without the early closing contact function as an option is applied. As illustrated in FIG. 6, the tripping unit 7 is inserted into and used in the case 1a of the circuit breaker 1 to immediately respond.

In addition, in the case where the undervoltage tripping device has a function having an early closing contact, the early closing contact is attached to the external operation handle device 2 by adding the early closing contact unit 8 as shown in FIG. 5. It can also respond easily to the optional specification of the provided undervoltage tripping device.

Next, the transition of the operation of the early closing contact corresponding to the steering wheel operation in the use state in which the early closing contact unit 8 is attached to the external operating handle device 2 will be described with reference to FIG. 7.

First, Figs. 7A and 7E show a state where the rotary handle 4 of the external operation handle device 2 is stopped at the OFF position. In this state, the slide base 6 stops at the left end of the movement stroke by the addition of the return spring 9 (tension coil spring), and the pusher 6b is added to the spring 6c at this position. The backlash stroke L1 is held between the rear end of the rear end and the rear end of the window hole 6e opened in the slide base 6. Moreover, in this position, the limit switch 8a of the early closing contact unit 8 arrange | positioned at the side surface of the slide base 6 replaces the cam groove 6f of the slide base 6, and an early closing contact is OFF. .

In this state, when the rotary handle 4 starts to turn to the ON position (see FIG. 7B), the slide base 6 starts to move in the right direction following this. In this case, in the stroke stroke range immediately after the start of the movement corresponding to the above-described backlash stroke L1 (see FIG. 7E), the pusher 6b added from the rear by the weak spring 6c is connected to the circuit breaker. The rocker handle 1e abuts, but the rocker handle 1e is stopped in the OFF position, and the limit switch 8a is released from the cam groove 6f of the slide base 6 to close the early closing contact (ON). action). As a result, the electromagnet coil incorporated in the tripping unit 7 (see FIG. 2A) of the undervoltage tripping device is energized.

Then, if the rotary handle 4 continues to rotate further from the position in FIG. 7B toward the ON position, the slide base 6 presses the rocker handle 1e of the circuit breaker integrally with the pusher 6b. The toggle link mechanism (see Fig. 8) of the opening / closing mechanism portion 1d of the circuit breaker is rapidly reversed in the middle of the movement stroke. As a result, the main circuit contact is closed in response to the opening / closing spring of the toggle link mechanism. At the same time, the rocker handle 1e reaches the stroke end shown in Fig. 7E and stops at this ON position. do. In addition, the operation stroke of the rocker handle 1e according to the closed-pole operation of this main circuit contact is shown by L2 in the figure.

In addition, when the rocker handle 1e of the circuit breaker reaches the ON position, the rotary handle 4 of the external operation handle device 2 slightly overruns the ON position as shown in FIG. After that, it stops at the ON position of FIG. In addition, as the rotary handle 4 moves, the slide base 6 and the pusher 8b stop at the position of (h) via Fig. 7G. In addition, the limit switch 8a of the early closing contact unit 8 remains in the ON state even after the main circuit contact of the circuit breaker closes, and is incorporated in the tripping unit 7 (see FIG. 2 (a)). Keep the coil energized.

As is apparent from the above description, the undervoltage tripping device of the present embodiment is a combination of the tripping unit 7 and the early closing contact unit 8, and the undervoltage tripping device having the early closing contact described in Patent Document 2. The same operation and function as can be achieved. In addition, as described in Patent Literature 2, the circuit breaker does not need to be equipped with a dedicated rotary handle to be connected to the early closing contact, and a slight change is made to the slide base of the external operating handle device, so that the external operating handle device is By simply attaching the early closing contact unit 8 and externally attaching it, the existing built-in undervoltage tripping device (see Patent Document 1) can be used as it is, so that the optional specification of the undervoltage tripping device with the early closing contact function can be easily Can match. As a result, the manufacturer of the circuit breaker can reduce the type of optional products to be prepared as an accessory device corresponding to the undervoltage tripping device, and reduce the cost of inventory and management.

Industrial availability

As described above, the accessory of the circuit breaker according to the present invention is configured by dividing the optional items related to the undervoltage tripping device applied to the circuit breaker into a plurality of units, and selecting the unit according to the specification of the option specified by the user. It is useful to easily cope with the specification of various designation options by using a combination circuit breaker.

1: circuit breaker
1a: breaker case
1e: rocker handle
2: external operation handle unit
3: base
4: rotary handle
6: slide base
6b: pusher
6c: spring
6f: cam groove
7: tripping unit
8: Early closing contact unit
8a: limit switch
8b: frame
8e: support leg

Claims (3)

As an accessory device of a circuit breaker equipped with an external operation handle device and an undervoltage tripping device as an accessory device,
The undervoltage tripping device is separated into two modules: a tripping unit with a tripping mechanism and an early closing contact unit with an early closing contact,
The tripping unit is embedded in a case of the circuit breaker,
The early closing contact unit is externally attached to an external operation handle device to link the early closing contact to an internal mechanism of the external operation handle device,
And the premature closing contact is closed at a stroke before the main circuit contact of the circuit breaker closes during the ON operation of the external operation handle device. The method of claim 1,
The external operation handle device includes a base attached to the case of the circuit breaker, a rotary handle, and a rotation of the handle in a linear motion to turn the rocker handle of the circuit breaker in the ON and OFF directions. A slide base to be driven, a pusher mounted on the slide base and a pusher mounted on the rocker handle from the ON operation direction and a spring to be pushed from the rear. And a backlash stroke is set between the slide base and the pusher.
And the movement of the slide base corresponding to the backlash stroke in the closing operation of the circuit breaker to open and close the early closing contact of the early closing contact unit. 3. The method according to claim 1 or 2,
The early closing contact unit comprises an assembly of a frame having a limit switch having the early closing contact and a terminal holding the limit switch,
The frame is detachably attached to the base of the external operation handle device, and the operation end of the limit switch is connected to the slide base of the external operation handle device at the attachment position thereof. Accessory device.

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