EP2509091B1 - Auxiliary device of circuit breaker - Google Patents
Auxiliary device of circuit breaker Download PDFInfo
- Publication number
- EP2509091B1 EP2509091B1 EP10834376.5A EP10834376A EP2509091B1 EP 2509091 B1 EP2509091 B1 EP 2509091B1 EP 10834376 A EP10834376 A EP 10834376A EP 2509091 B1 EP2509091 B1 EP 2509091B1
- Authority
- EP
- European Patent Office
- Prior art keywords
- circuit breaker
- closing contact
- early closing
- external operating
- operating handle
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Not-in-force
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Classifications
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
- H01H83/00—Protective switches, e.g. circuit-breaking switches, or protective relays operated by abnormal electrical conditions otherwise than solely by excess current
- H01H83/12—Protective switches, e.g. circuit-breaking switches, or protective relays operated by abnormal electrical conditions otherwise than solely by excess current operated by voltage falling below a predetermined value, e.g. for no-volt protection
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
- H01H73/00—Protective overload circuit-breaking switches in which excess current opens the contacts by automatic release of mechanical energy stored by previous operation of a hand reset mechanism
- H01H73/02—Details
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
- H01H71/00—Details of the protective switches or relays covered by groups H01H73/00 - H01H83/00
- H01H71/10—Operating or release mechanisms
- H01H71/50—Manual reset mechanisms which may be also used for manual release
- H01H71/56—Manual reset mechanisms which may be also used for manual release actuated by rotatable knob or wheel
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
- H01H71/00—Details of the protective switches or relays covered by groups H01H73/00 - H01H83/00
- H01H71/10—Operating or release mechanisms
- H01H71/50—Manual reset mechanisms which may be also used for manual release
- H01H71/56—Manual reset mechanisms which may be also used for manual release actuated by rotatable knob or wheel
- H01H2071/565—Manual reset mechanisms which may be also used for manual release actuated by rotatable knob or wheel using a add on unit, e.g. a separate rotary actuator unit, mounted on lever actuated circuit breakers
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
- H01H71/00—Details of the protective switches or relays covered by groups H01H73/00 - H01H83/00
- H01H71/10—Operating or release mechanisms
- H01H71/12—Automatic release mechanisms with or without manual release
- H01H71/46—Automatic release mechanisms with or without manual release having means for operating auxiliary contacts additional to the main contacts
Definitions
- This invention relates to an auxiliary device for a circuit breaker, targeting circuit breakers for wiring applied to low-voltage power distribution equipment and earth leakage circuit breakers, and more specifically relates to the configuration of an undervoltage tripping device and an external operating handle device which are mounted on a circuit breaker and used as auxiliary devices of the circuit breaker.
- auxiliary devices are prepared as options for the circuit breaker of the title; one such device is an undervoltage tripping device.
- This undervoltage tripping device trips the circuit breaker when the voltage of a circuit for protection (voltage of the main circuit or control circuit) falls below a voltage stipulated in advance (for example, in the range 35 to 85% of a rated voltage), thereby shutting off the main circuit.
- a voltage stipulated in advance for example, in the range 35 to 85% of a rated voltage
- internal type undervoltage tripping devices are known which are inserted into and set inside the case of a circuit breaker for use (see for example Patent Reference 1).
- Such an internal type undervoltage tripping device is provided with a tripping mechanism that is mounted on a cassette case within the case of the circuit breaker, and is constituted by an assembly of an electromagnet, an actuator joined to the armature of the electromagnet so as to be opposed to a tripping crossbar of the circuit breaker, an armature release spring, and a reset lever linked to the armature.
- the reset lever of the undervoltage tripping device linked thereto returns the actuator to the retracted position in opposition to the release spring. In this state, if the main circuit voltage has returned to the stipulated range, the electromagnet attracts and holds the armature, and the actuator is held in the retracted position, so that reclosing of the circuit breaker is established.
- an undervoltage tripping device with an early closing contact which combines the above-described tripping mechanism with an early closing contact switch, in which this early closing contact switch is connected to the power supply circuit of the electromagnet coil, is also known (see for example Patent Reference 2).
- This undervoltage tripping device with an early closing contact performs circuit breaker closing safely and accurately, and so in the above-described configuration which combines an early closing contact switch mechanism with a tripping mechanism including an electromagnet, in a state of use in which this device is mounted on a circuit breaker, the early closing contact switch mechanism is linked to a driving lever (cam type lever) or similar provided on the handle of the circuit breaker.
- the handle of the circuit breaker which is halted in the TRIP position, is returned once to the OFF position and then moved toward the ON position, the early closing contact is closed before closing of the main circuit contact of the circuit breaker, and the electromagnetic coil is excited by a current.
- the armature of the electromagnet of the tripping mechanism is attracted and held, and the actuator is held in the retracted position, so that when the handle is moved to the ON position, reclosing of the circuit breaker is established.
- the electromagnet armature is not attracted, so that even when the handle is moved to the ON position, the circuit breaker is not reset, and returns to the tripped state.
- An undervoltage tripping device with an early closing contact is large in size compared with the internal type undervoltage tripping device disclosed in Patent Reference 1, and without further modification, incorporation within the case of a circuit breaker would be difficult; hence normally a unit case is external mounted on a side face of the circuit breaker case, as in Patent Reference 2, and is linked via a driving lever onto a driving handle, which is a rotary handle of the circuit breaker onto which the early closing contact switch mechanism is mounted.
- circuit breakers for wiring, earth leakage circuit breakers
- auxiliary devices externally operated handle devices which perform operations to open and close the circuit breaker from the front of the panel door are used.
- a design is known in which a rocker handle of the circuit breaker is driven to the ON, OFF and RESET positions by operation of the rotary handle mounted on an external operating handle device (see for example Patent Reference 3).
- Figs. 8(a) to 8(c) 1 is a circuit breaker (wiring circuit breaker), and 2 is an external operating handle device, mounted on the case of the circuit breaker as an auxiliary device of the circuit breaker 1.
- the circuit breaker 1 is configured comprising, installed in a case 1a, an open/close mechanism 1b, movable contact point 1c, open/close mechanism 1d comprising a reversal operation type toggling mechanism, rocker handle 1e disposed on the top of the case 1a and linked to the open/close mechanism 1d, and overcurrent tripping device 1f, and similar.
- 5a is a nameplate displaying the positions ON, OFF, TRIP, RESET of the handle 4.
- the open/close operation of the above circuit breaker 1 is well known; when the rocker handle 1e is switched by moving from the ON position as shown to the right and downward to the OFF position, in the midst of this stroke the open/close mechanism 1d performs a reversal operation, receiving the biasing force of the open/close spring of the open/close mechanism 1d to open the movable contact point 1c. Further, when a main circuit overcurrent is detected and the overcurrent tripping device 1f operates, the open/close mechanism 1d performs a release operation, the movable contact point 1c is opened, and the main circuit current is cut off. Through this tripping operation, the rocker handle 1e moves to a position intermediate between the ON position and the OFF position, and displays the trip operation state.
- the external operating handle device 2 comprises, mounted on a base 3 fixed in place by fastening with screws to the top of the case 1a of the circuit breaker 1, a rotary handle 4, handle cover 5, sliding base 6 and other driving components; a turning base 4b linked to a support shaft 4a of the handle 4 comprises a crank pin 4c.
- the sliding base 6 is slidably guided and supported in a direction parallel to the rocker handle 1e of the circuit breaker 1, and a long hole 6a directed perpendicular to the sliding direction is opened in the plate face thereof; the crank pin 4c is mated with this long hole 6a and linked with the rotary handle 4.
- the sliding base 6 comprises a pusher 6b which opposes, from the ON side, the knob of the rocker handle 1e protruding from the case 1a of the circuit breaker 1, and a biasing spring 6c which presses the pusher 6b from behind toward the knob of the handle 1e.
- the handle 4 of the external operating handle device 2 linked to the rocker handle 1e moves to the TRIP position intermediate between the ON position and the OFF position, and halts. And, in order to reclose the circuit breaker 1 from this state, first the rotary handle 4 is turned to the RESET position. By this means, the tripping mechanism linked to the open/close mechanism 1d of the circuit breaker 1 is reset, and then when the rotary handle 4 reversed and turned to the ON position, the rocker handle 1 e of the circuit breaker 1 moves to the OFF position, and the movable contact point 1 c makes contact with the fixed contact point 1 b, establishing reclosing of the circuit breaker 1.
- Patent Reference 4 discloses an under-voltage tripping device installed on a main body of a circuit breaker including an electromagnetic under-voltage tripping mechanism, an early-operation auxiliary switch for switching a conductive path of an electromagnet of the electromagnetic under-voltage tripping mechanism in connection with a handle mechanism of the circuit breaker, and a unit case having two opposite ends and external connection terminals at the two opposite ends.
- Patent Reference 5 discloses a circuit breaker and an auxiliary device including an undervoltage tripping mechanism and an early closing contact mechanism. Both mechanism are coupled to each other.
- Patent Reference 6 teaches an auxiliary device for a circuit breaker, comprising an electrical protection unit that cooperates, by means of a mechanism, with an opening slider biased by a return spring. In case of a voltage drop, the opening slider is released acting on a safety release lever of an enclosed circuit breaker.
- auxiliary devices prepared by manufacturers as options for the above-described circuit breakers are adopted to accommodate the specifications of users.
- optional undervoltage tripping device products include, as described above, normal internal type undervoltage tripping devices not provided with an early closing contact (see Patent Reference 1), and undervoltage tripping devices with an early closing contact (see Patent Reference 2); these specifications further differ according to the type, rated voltage, and other parameters of the circuit breaker.
- Patent Reference 1 normal internal type undervoltage tripping devices not provided with an early closing contact
- Patent Reference 2 undervoltage tripping devices with an early closing contact
- these specifications further differ according to the type, rated voltage, and other parameters of the circuit breaker.
- auxiliary device types vary according to the environment of use of the circuit breaker, user specifications, and similar.
- circuit breaker manufacturers must prepare various types of undervoltage tripping devices with different specifications and designs in anticipation of options specified by users, and costs are entailed in stocking and managing such optional products.
- This invention was devised in light of the above problems, and has as an object the provision of an auxiliary device for a circuit breaker wherein, with respect to an undervoltage tripping device applied to a circuit breaker, optional products related to the undervoltage tripping device can be divided into a plurality of units and configured in advance, and units selected according to option specifications specified by a user can be combined and used with a circuit breaker, to enable accommodation of specifications with various options specified by simple means.
- an auxiliary device of a circuit breaker is an auxiliary device of a circuit breaker which has, as the auxiliary device, an external operating handle device and an undervoltage tripping device, wherein the undervoltage tripping device is divided into two modules, which are a tripping unit comprising a tripping mechanism and an early closing contact unit comprising an early closing contact; the tripping unit is internally provided in a case of the circuit breaker, the early closing contact unit is externally provided on the external operating handle device such that the early closing contact is linked to an internal mechanism of the external operating handle device, and the early closing contact is closed midway during ON operation of the external operating handle device and before a main circuit contact of the circuit breaker closes.
- the auxiliary device of a circuit breaker is the external operating handle device, comprising a base mounted on the case of the circuit breaker; a rotary type handle; a sliding base which converts rotation of the handle into linear motion and drives a rocker type handle of the circuit breaker in ON and OFF directions; a pusher, installed on the sliding base and opposed to the rocker type handle from the ON operation direction; and a spring which biases the pusher from the rear, the external operating handle device being configured with a backlash stroke set between the sliding base and the pusher, and the movement of the sliding base corresponding to the backlash stroke is captured, and the early closing contact of the early closing contact unit is caused to perform open/close operation, in the process of turning on the circuit breaker.
- the early closing contact unit comprises an assembly of a limit switch provided with the early closing contact, and a frame with a terminal which holds the limit switch; the frame is detachably mounted on a base of the external operating handle device, and an operation end of the limit switch is linked to the sliding base of the external operating handle device at this mounted position.
- auxiliary device of a circuit breaker of this invention by configuring an undervoltage tripping device as described above as an auxiliary device of a circuit breaker, the minimum number of types of optional products can be selected appropriately and applied to the circuit breaker, so that various specified option specifications can be accommodated by simple means.
- Fig. 1 shows an example of this invention, which is an external operating handle device and undervoltage tripping device mounted as auxiliary devices on a circuit breaker.
- 1 is the circuit breaker comprising a rocker handle 1e on the top of a case 1a
- 2 is the external operating handle device
- 7 is a tripping unit of the undervoltage tripping device, internally provided in the case 1a of the circuit breaker 1
- 8 is an early closing contact unit of the undervoltage tripping device, detachably mounted externally on the rear-face side of the base 3 of the external operating handle device 2, disposed between [the base 3 and] the circuit breaker 1.
- the tripping unit 7 is configured with a tripping mechanism, including an electromagnet, mounted on a cassette-type unit case as shown in Fig. 2(a) , similarly to that of Patent Reference 1 described above.
- 7a is an actuator opposed to a trip crossbar of the circuit breaker, protruding from the unit case, and 7b is a reset lever.
- Fig. 2(a) the cassette-type unit case as shown in Fig. 2(a)
- 7a is an actuator opposed to a trip crossbar of the circuit breaker, protruding from the unit case
- 7b is a reset lever.
- the early closing contact unit 8 comprises an assembly of a limit switch 8a provided with an early closing contact, and a mounting frame 8b which holds the limit switch 8a;
- the mounting frame 8b comprises an external connection terminal 8c, terminal screws 8d, and a pair of support legs (snap fits) 8e protruding upward from both ends of the mounting frame 8b.
- the external operating handle device 2 has substantially the same configuration as the conventional external operating handle device shown in Fig. 8 ; the detailed structure thereof is shown in Fig. 3 . That is, the sliding base 6 mounted on the base 3 of the external operating handle device, guided in a straight line and supported, has a pin 6d erected on the upper-face side thereof which mates with a groove 4b-1 in the turning base 4b, and is linked to the rotary handle 4 via a support shaft 4a. Further, a window hole 6e, with the shape of a small square placed on a large lateral rectangle, is cut out and opened in the plate face of the sliding base 6, and as explained below, a pusher 6b, opposed from the ON side by the rocker handle 1e (see Fig.
- a cam groove 6f which functions as a dog opening and closing the limit switch 8a (see Fig. 2(b) ) of the above-described early closing contact unit 8 is formed in a side face of the sliding base 6 along the direction of movement.
- Figs. 4(a) and 4(b) show the assembled state of the external operating handle device 2; when the rotary handle 4 is rotated manually to the ON and OFF positions, the sliding base 6, linked to the handle 4, slides and moves in a straight-line direction, and as shown in Fig. 8 , drives the rocker handle 1e of the circuit breaker 1 to the ON and OFF positions.
- Fig. 5 shows the state of use in which the early closing contact unit 8 of the undervoltage tripping device is additionally mounted on the external operating handle device 2, mounted on the circuit breaker 1 (although not shown, the tripping unit 7 of the above-described undervoltage tripping device is internally set in the case of the circuit breaker).
- the early closing contact unit 8 is snap-fit and detachably joined by pressing, from the rear-face side, the support legs 8e provided in the frame 8b into engaging holes 3e (see Fig. 1 ) opened in the base 3 of the external operating handle device 2. Further, in this assembled state, the terminals 8c of the early closing contact unit 8 are connected to the exciting circuit of the electromagnet coil incorporated in the tripping unit 7.
- Fig. 6 shows the state of use in which an early closing contact unit 8 is not used, and the tripping unit 7 is internally set in the case of the circuit breaker 1.
- this undervoltage tripping device is to be provided with an early closing contact function
- by adding the early closing contact unit 8 and mounting on the external operating handle device 2 as in Fig. 5 optional specifications for an undervoltage tripping device with an early closing contact can be accommodated by simple means.
- Fig. 7 is used to explain transitions in operation of the early closing contact corresponding to handle operation.
- Figs. 7(a) and 7(e) show a state in which the rotary handle 4 of the external operating handle device 2 is halted in the OFF position.
- the sliding base 6 is halted on the left end of the movement stroke by the biasing force of a return spring 9 (tension coil spring), and in this position a backlash stroke L1 is held between the rear end of the pusher 6b, being biased by the spring 6c, and the rear end of the window hole 6e opened in the sliding base 6.
- the limit switch 8a of the early closing contact unit 8 disposed on a side face of the sliding base 6 is opposed to the cam groove 6f of the sliding base 6, and the early closing contact is OFF.
- the rotary handle 4 of the external operating handle device 2 passes the ON position somewhat, as shown in Fig. 7(c) , and after this overrun halts at the ON position of Fig. 7(d) . Further, accompanying this operation of the rotary handle 4, the sliding base 6 and pusher 8b pass through Fig. 7(g) to halt at the position of Fig. 7(h) .
- the limit switch 8a of the early closing contact unit 8 holds the ON state even after the main circuit contact of the circuit breaker has closed, and maintains an excitation current in the electromagnet coil incorporated in the tripping unit 7 (see Fig. 2(a) ).
- the undervoltage tripping device of this embodiment combines a tripping unit 7 and an early closing contact unit 8, and so can exhibit the same operations and functions as the undervoltage tripping device with an early closing contact described in Patent Reference 2. Moreover, there is no need to install a dedicated rotary handle in the circuit breaker which links to the early closing contact, as described in Patent Reference 2, and merely by somewhat modifying the sliding base of the external operating handle device and additionally external mounting the above early closing contact unit 8 on this external operating handle device, an existing internal type undervoltage tripping device (see Patent Reference 1) can be used as-is, and optional specifications for an undervoltage tripping device with an early closing contact function can be accommodated by simple means. By this means, circuit breaker manufacturers can reduce the number of optional products prepared as auxiliary devices for undervoltage tripping devices compared with previously, and costs entailed in stocking and management of such products can be reduced.
- an optional product related to an undervoltage tripping device is divided into a plurality of units and configured in advance, and units selected according to option specifications specified by a user can be combined and used with a circuit breaker, to enable accommodation of specifications with various options specified by simple means.
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Description
- This invention relates to an auxiliary device for a circuit breaker, targeting circuit breakers for wiring applied to low-voltage power distribution equipment and earth leakage circuit breakers, and more specifically relates to the configuration of an undervoltage tripping device and an external operating handle device which are mounted on a circuit breaker and used as auxiliary devices of the circuit breaker.
- As is well known, various auxiliary devices are prepared as options for the circuit breaker of the title; one such device is an undervoltage tripping device.
- This undervoltage tripping device trips the circuit breaker when the voltage of a circuit for protection (voltage of the main circuit or control circuit) falls below a voltage stipulated in advance (for example, in the range 35 to 85% of a rated voltage), thereby shutting off the main circuit. As one example, internal type undervoltage tripping devices are known which are inserted into and set inside the case of a circuit breaker for use (see for example Patent Reference 1).
- Such an internal type undervoltage tripping device is provided with a tripping mechanism that is mounted on a cassette case within the case of the circuit breaker, and is constituted by an assembly of an electromagnet, an actuator joined to the armature of the electromagnet so as to be opposed to a tripping crossbar of the circuit breaker, an armature release spring, and a reset lever linked to the armature.
- Operation and functions of such an undervoltage tripping device are described in detail in
Patent Reference 1; the coil of the electromagnet is excited by a current passed by a control circuit with the main circuit of the circuit breaker as its power supply, and attracts the armature of the electromagnet in opposition to the release spring during stationary operation, so as to hold the actuator in the retracted position. On the other hand, when the voltage of the main circuit falls below a stipulated range, the attractive force of the electromagnet is reduced, and restraint of the actuator is removed. As a result, the actuator receives the biasing force of the release spring, strikes the trip crossbar, and causes tripping operation of the circuit breaker. - After tripping operation, when the handle of the circuit breaker is operated from the OFF to the ON position, the reset lever of the undervoltage tripping device linked thereto returns the actuator to the retracted position in opposition to the release spring. In this state, if the main circuit voltage has returned to the stipulated range, the electromagnet attracts and holds the armature, and the actuator is held in the retracted position, so that reclosing of the circuit breaker is established.
- As an undervoltage tripping device of a circuit breaker, an undervoltage tripping device with an early closing contact, which combines the above-described tripping mechanism with an early closing contact switch, in which this early closing contact switch is connected to the power supply circuit of the electromagnet coil, is also known (see for example Patent Reference 2).
- This undervoltage tripping device with an early closing contact performs circuit breaker closing safely and accurately, and so in the above-described configuration which combines an early closing contact switch mechanism with a tripping mechanism including an electromagnet, in a state of use in which this device is mounted on a circuit breaker, the early closing contact switch mechanism is linked to a driving lever (cam type lever) or similar provided on the handle of the circuit breaker.
- When, in the process of handle operation for reclosing after a tripping operation of the circuit breaker, the handle of the circuit breaker, which is halted in the TRIP position, is returned once to the OFF position and then moved toward the ON position, the early closing contact is closed before closing of the main circuit contact of the circuit breaker, and the electromagnetic coil is excited by a current. At this time, if the voltage of the main circuit has returned to a voltage in the stipulated range, the armature of the electromagnet of the tripping mechanism is attracted and held, and the actuator is held in the retracted position, so that when the handle is moved to the ON position, reclosing of the circuit breaker is established. On the other hand, if the main circuit voltage has not returned to a stipulated voltage, the electromagnet armature is not attracted, so that even when the handle is moved to the ON position, the circuit breaker is not reset, and returns to the tripped state.
- An undervoltage tripping device with an early closing contact is large in size compared with the internal type undervoltage tripping device disclosed in
Patent Reference 1, and without further modification, incorporation within the case of a circuit breaker would be difficult; hence normally a unit case is external mounted on a side face of the circuit breaker case, as inPatent Reference 2, and is linked via a driving lever onto a driving handle, which is a rotary handle of the circuit breaker onto which the early closing contact switch mechanism is mounted. - On the other hand, the above-described circuit breakers (circuit breakers for wiring, earth leakage circuit breakers) are generally installed on and used in wiring boards, distribution boards, and similar, and as auxiliary devices, externally operated handle devices which perform operations to open and close the circuit breaker from the front of the panel door are used. As one such example, a design is known in which a rocker handle of the circuit breaker is driven to the ON, OFF and RESET positions by operation of the rotary handle mounted on an external operating handle device (see for example Patent Reference 3).
- Next, the structure of a conventional example of an external operating handle device is explained using
Fig. 8 . InFigs. 8(a) to 8(c) , 1 is a circuit breaker (wiring circuit breaker), and 2 is an external operating handle device, mounted on the case of the circuit breaker as an auxiliary device of thecircuit breaker 1. Here, thecircuit breaker 1 is configured comprising, installed in acase 1a, an open/close mechanism 1b,movable contact point 1c, open/close mechanism 1d comprising a reversal operation type toggling mechanism,rocker handle 1e disposed on the top of thecase 1a and linked to the open/close mechanism 1d, andovercurrent tripping device 1f, and similar. 5a is a nameplate displaying the positions ON, OFF, TRIP, RESET of thehandle 4. - The open/close operation of the
above circuit breaker 1 is well known; when therocker handle 1e is switched by moving from the ON position as shown to the right and downward to the OFF position, in the midst of this stroke the open/close mechanism 1d performs a reversal operation, receiving the biasing force of the open/close spring of the open/close mechanism 1d to open themovable contact point 1c. Further, when a main circuit overcurrent is detected and theovercurrent tripping device 1f operates, the open/close mechanism 1d performs a release operation, themovable contact point 1c is opened, and the main circuit current is cut off. Through this tripping operation, the rocker handle 1e moves to a position intermediate between the ON position and the OFF position, and displays the trip operation state. - On the other hand, the external
operating handle device 2 comprises, mounted on abase 3 fixed in place by fastening with screws to the top of thecase 1a of thecircuit breaker 1, arotary handle 4,handle cover 5, slidingbase 6 and other driving components; aturning base 4b linked to asupport shaft 4a of thehandle 4 comprises acrank pin 4c. Thesliding base 6 is slidably guided and supported in a direction parallel to therocker handle 1e of thecircuit breaker 1, and along hole 6a directed perpendicular to the sliding direction is opened in the plate face thereof; thecrank pin 4c is mated with thislong hole 6a and linked with therotary handle 4. Further, in a state in which the externaloperating handle device 2 is mounted on thecircuit breaker 1, thesliding base 6 comprises apusher 6b which opposes, from the ON side, the knob of therocker handle 1e protruding from thecase 1a of thecircuit breaker 1, and a biasingspring 6c which presses thepusher 6b from behind toward the knob of thehandle 1e. - In the above configuration, when the
rotary handle 4 is rotated in manual operation from the ON position to the OFF position, thesliding base 6 slides rightward via thecrank pin 4c, and therocker handle 1e of thecircuit breaker 1 is driven toward the OFF position via thepusher 6b. Here, when thehandle 1e is displaced to substantially the intermediate position of the movement stroke, the toggling mechanism of the open/close mechanism 1d provided in thecircuit breaker 1 performs reversal operation. By this means, themovable contact point 1 c recedes from thefixed contact point 1 b and moves to the open position, and thecircuit breaker 1 is turned OFF. - Further, when the circuit breaker 1 detects and overcurrent and performs tripping operation, the
handle 4 of the externaloperating handle device 2 linked to therocker handle 1e moves to the TRIP position intermediate between the ON position and the OFF position, and halts. And, in order to reclose thecircuit breaker 1 from this state, first therotary handle 4 is turned to the RESET position. By this means, the tripping mechanism linked to the open/close mechanism 1d of thecircuit breaker 1 is reset, and then when therotary handle 4 reversed and turned to the ON position, the rocker handle 1 e of thecircuit breaker 1 moves to the OFF position, and themovable contact point 1 c makes contact with thefixed contact point 1 b, establishing reclosing of thecircuit breaker 1. -
- Patent Reference 1:
Japanese Patent Application Laid-open No. H10-255639 - Patent Reference 2: Patent Publication No.
3867541 - Patent Reference 3:
Japanese Patent Application Laid-open No. 2007-134148 Fig. 7 andFig. 8 ) - Patent Reference 4: United States Patent Application
US 2002/158733 A1 - Patent Reference 5: French Patent Application
FR 2831321 A1 - Patent Reference 6: European Patent Application
EP 1261010 A1 -
Patent Reference 4 discloses an under-voltage tripping device installed on a main body of a circuit breaker including an electromagnetic under-voltage tripping mechanism, an early-operation auxiliary switch for switching a conductive path of an electromagnet of the electromagnetic under-voltage tripping mechanism in connection with a handle mechanism of the circuit breaker, and a unit case having two opposite ends and external connection terminals at the two opposite ends. -
Patent Reference 5 discloses a circuit breaker and an auxiliary device including an undervoltage tripping mechanism and an early closing contact mechanism. Both mechanism are coupled to each other. -
Patent Reference 6 teaches an auxiliary device for a circuit breaker, comprising an electrical protection unit that cooperates, by means of a mechanism, with an opening slider biased by a return spring. In case of a voltage drop, the opening slider is released acting on a safety release lever of an enclosed circuit breaker. - However, the above-described conventional undervoltage tripping devices and external operating handle devices prepared by manufacturers as auxiliary devices for circuit breakers have the following problems in accommodating optional specifications specified by users.
- That is, various auxiliary devices prepared by manufacturers as options for the above-described circuit breakers are adopted to accommodate the specifications of users. In such cases, optional undervoltage tripping device products include, as described above, normal internal type undervoltage tripping devices not provided with an early closing contact (see Patent Reference 1), and undervoltage tripping devices with an early closing contact (see Patent Reference 2); these specifications further differ according to the type, rated voltage, and other parameters of the circuit breaker. In addition, there are also cases in which a circuit breaker is combined for use with an external operating handle device, and in these and other ways, auxiliary device types vary according to the environment of use of the circuit breaker, user specifications, and similar.
- Hence circuit breaker manufacturers must prepare various types of undervoltage tripping devices with different specifications and designs in anticipation of options specified by users, and costs are entailed in stocking and managing such optional products.
- However, when adopting the above-described undervoltage tripping device with an early closing contact (see Patent Reference 2) as an auxiliary device for a circuit breaker, it is necessary to equip the circuit breaker in advance with a dedicated rotary handle provided with a driving lever which is linked to the early closing contact switch mechanism.
- However, in an ordinary circuit breaker (see
Fig. 8 ) a rocker handle is not provided as standard, and when adopting an undervoltage tripping device with an early closing contact, various circuit breakers provided with dedicated rotary handles must be used. If the above-described dedicated rotary handle is provided as standard in a circuit breaker in advance, in anticipation of accommodating an undervoltage tripping device with an early closing contact, there is the problem that in cases where an undervoltage tripping device with an early closing contact is not used, specifications are excessive, and the cost of the circuit breaker product is increased. - This invention was devised in light of the above problems, and has as an object the provision of an auxiliary device for a circuit breaker wherein, with respect to an undervoltage tripping device applied to a circuit breaker, optional products related to the undervoltage tripping device can be divided into a plurality of units and configured in advance, and units selected according to option specifications specified by a user can be combined and used with a circuit breaker, to enable accommodation of specifications with various options specified by simple means.
- In order to attain the above object, an auxiliary device of a circuit breaker according to one embodiment of the invention is an auxiliary device of a circuit breaker which has, as the auxiliary device, an external operating handle device and an undervoltage tripping device, wherein the undervoltage tripping device is divided into two modules, which are a tripping unit comprising a tripping mechanism and an early closing contact unit comprising an early closing contact; the tripping unit is internally provided in a case of the circuit breaker, the early closing contact unit is externally provided on the external operating handle device such that the early closing contact is linked to an internal mechanism of the external operating handle device, and the early closing contact is closed midway during ON operation of the external operating handle device and before a main circuit contact of the circuit breaker closes.
- Further, the auxiliary device of a circuit breaker according to one embodiment of the invention is the external operating handle device, comprising a base mounted on the case of the circuit breaker; a rotary type handle; a sliding base which converts rotation of the handle into linear motion and drives a rocker type handle of the circuit breaker in ON and OFF directions; a pusher, installed on the sliding base and opposed to the rocker type handle from the ON operation direction; and a spring which biases the pusher from the rear, the external operating handle device being configured with a backlash stroke set between the sliding base and the pusher, and the movement of the sliding base corresponding to the backlash stroke is captured, and the early closing contact of the early closing contact unit is caused to perform open/close operation, in the process of turning on the circuit breaker.
- Further, in the auxiliary device of a circuit breaker according to one embodiment of the invention, the early closing contact unit comprises an assembly of a limit switch provided with the early closing contact, and a frame with a terminal which holds the limit switch; the frame is detachably mounted on a base of the external operating handle device, and an operation end of the limit switch is linked to the sliding base of the external operating handle device at this mounted position.
- By means of an auxiliary device of a circuit breaker of this invention, by configuring an undervoltage tripping device as described above as an auxiliary device of a circuit breaker, the minimum number of types of optional products can be selected appropriately and applied to the circuit breaker, so that various specified option specifications can be accommodated by simple means.
- That is, when a normal undervoltage tripping device not having an early closing contact function is applied as an auxiliary device of a circuit breaker, immediate accommodation is possible by providing the tripping unit internally in the case of the circuit breaker. Further, in this case an external operating handle device can be mounted on the circuit breaker as necessary.
- On the other hand, as an undervoltage tripping device, when the option specifications are changed to include an early closing contact function, the above-described existing tripping unit is internally provided without modification in the case of the circuit breaker, and an early closing contact unit can be added as an optional product, externally mounted on the external operating handle device mounted on the circuit breaker, to accommodate specifications by simple means. Hence circuit breaker manufacturers may prepare a smaller number of optional products than in the prior art, and the costs entailed in stocking and managing such optional products can be greatly reduced.
-
-
Fig. 1 is an exploded perspective view of an example of this invention, in which the auxiliary devices of an external operating handle device and an undervoltage tripping device are mounted on a circuit breaker; -
Fig. 2 shows the configuration of an undervoltage tripping device with an early closing contact applied to the circuit breaker ofFig. 1 , in whichFigs. 2(a) and 2(b) are perspective views of the tripping unit and the early closing contact unit respectively; -
Fig. 3 shows the assembled structure of the external operating handle device inFig. 1 , in whichFig. 3(a) is an exploded perspective view of the entire device, andFig. 3(b) is an exploded perspective view of the sliding base inFig. 3(a) ; -
Fig. 4 shows states of operation of the external operating handle device shown inFig. 3 , whereinFigs. 4(a) and 4(b) respectively show the states of rotating the handle to the ON and OFF positions; -
Fig. 5 is an external perspective view of the state of use when the early closing contact unit ofFig. 2 is externally mounted onto the external operating handle device ofFig. 3 , which is mounted on the circuit breaker; -
Fig. 6 is an external perspective view of a state of use with the early closing contact unit removed inFig. 5 ; -
Fig. 7 explains handle operation in a state of use of the early closing contact unit ofFig. 5 , in whichFigs. 7(a) to 7(d) show transitions in the handle position when rotating the handle of the external operating handle device from the OFF position to the ON position, andFigs. 7(e) to 7(h) show transitions in the operation of the sliding base, pusher, circuit breaker rocker handle and early closing contact unit corresponding toFigs. 7(a) to 7(d) respectively; and -
Fig. 8 shows the structure of the state of use with a conventional external operating handle device mounted on a circuit breaker, in whichFig. 8(a) is a side cross-sectional view,Fig. 8(b) is a plane view, andFig. 8(c) is a perspective view showing the internal mechanism of the external operating handle device. - Below, embodiments of the invention are explained based on
Fig. 1 to Fig. 7 . In the embodiments, members corresponding to members inFig. 8 are assigned the same symbols, and explanations are omitted. - First,
Fig. 1 shows an example of this invention, which is an external operating handle device and undervoltage tripping device mounted as auxiliary devices on a circuit breaker. In thefigure, 1 is the circuit breaker comprising arocker handle 1e on the top of acase case 1a of thecircuit breaker base 3 of the externaloperating handle device 2, disposed between [thebase 3 and] thecircuit breaker 1. - Here, the tripping
unit 7 is configured with a tripping mechanism, including an electromagnet, mounted on a cassette-type unit case as shown inFig. 2(a) , similarly to that ofPatent Reference 1 described above. 7a is an actuator opposed to a trip crossbar of the circuit breaker, protruding from the unit case, and 7b is a reset lever. On the other hand, as shown inFig. 2(b) , the earlyclosing contact unit 8 comprises an assembly of alimit switch 8a provided with an early closing contact, and a mountingframe 8b which holds thelimit switch 8a; the mountingframe 8b comprises anexternal connection terminal 8c,terminal screws 8d, and a pair of support legs (snap fits) 8e protruding upward from both ends of the mountingframe 8b. - Further, the external
operating handle device 2 has substantially the same configuration as the conventional external operating handle device shown inFig. 8 ; the detailed structure thereof is shown inFig. 3 . That is, the slidingbase 6 mounted on thebase 3 of the external operating handle device, guided in a straight line and supported, has apin 6d erected on the upper-face side thereof which mates with agroove 4b-1 in theturning base 4b, and is linked to therotary handle 4 via asupport shaft 4a. Further, awindow hole 6e, with the shape of a small square placed on a large lateral rectangle, is cut out and opened in the plate face of the slidingbase 6, and as explained below, apusher 6b, opposed from the ON side by therocker handle 1e (seeFig. 1 ) of thecircuit breaker 1, set with a backlash stroke with the slidingbase 6, and a weak spring (coil spring) 6c which biases thepusher 6b from behind, are set in thiswindow hole 6e. Further, acam groove 6f which functions as a dog opening and closing thelimit switch 8a (seeFig. 2(b) ) of the above-described earlyclosing contact unit 8 is formed in a side face of the slidingbase 6 along the direction of movement. -
Figs. 4(a) and 4(b) show the assembled state of the externaloperating handle device 2; when therotary handle 4 is rotated manually to the ON and OFF positions, the slidingbase 6, linked to thehandle 4, slides and moves in a straight-line direction, and as shown inFig. 8 , drives therocker handle 1e of thecircuit breaker 1 to the ON and OFF positions. - Further,
Fig. 5 shows the state of use in which the earlyclosing contact unit 8 of the undervoltage tripping device is additionally mounted on the externaloperating handle device 2, mounted on the circuit breaker 1 (although not shown, the trippingunit 7 of the above-described undervoltage tripping device is internally set in the case of the circuit breaker). Here, the earlyclosing contact unit 8 is snap-fit and detachably joined by pressing, from the rear-face side, thesupport legs 8e provided in theframe 8b into engagingholes 3e (seeFig. 1 ) opened in thebase 3 of the externaloperating handle device 2. Further, in this assembled state, theterminals 8c of the earlyclosing contact unit 8 are connected to the exciting circuit of the electromagnet coil incorporated in the trippingunit 7. On the other hand,Fig. 6 shows the state of use in which an earlyclosing contact unit 8 is not used, and the trippingunit 7 is internally set in the case of thecircuit breaker 1. - That is, by employing a configuration in which the undervoltage tripping device is divided into two optional parts, which are the tripping
unit 7 and the earlyclosing contact unit 8, cases where an undervoltage tripping device without an early closing contact function is applied as an option can immediately be accommodated by inserting, setting and using the trippingunit 7 in thecase 1a of thecircuit breaker 1, as inFig. 6 . - Further, in cases where this undervoltage tripping device is to be provided with an early closing contact function, by adding the early
closing contact unit 8 and mounting on the externaloperating handle device 2 as inFig. 5 , optional specifications for an undervoltage tripping device with an early closing contact can be accommodated by simple means. - Next, in a state of use in which the early
closing contact unit 8 is mounted on the externaloperating handle device 2,Fig. 7 is used to explain transitions in operation of the early closing contact corresponding to handle operation. - First,
Figs. 7(a) and 7(e) show a state in which therotary handle 4 of the externaloperating handle device 2 is halted in the OFF position. In this state, the slidingbase 6 is halted on the left end of the movement stroke by the biasing force of a return spring 9 (tension coil spring), and in this position a backlash stroke L1 is held between the rear end of thepusher 6b, being biased by thespring 6c, and the rear end of thewindow hole 6e opened in the slidingbase 6. Further, in this position thelimit switch 8a of the earlyclosing contact unit 8 disposed on a side face of the slidingbase 6 is opposed to thecam groove 6f of the slidingbase 6, and the early closing contact is OFF. - When, from this state, rotation of the
rotary handle 4 toward the ON position is begun (seeFig. 7(b) ), the slidingbase 6, driven by this rotation, begins to move rightward. In this case, in the stroke range immediately after the start of motion corresponding to the above-described backlash stroke L1 (seeFig. 7(e) ), thepusher 6b biased from behind by theweak spring 6c abuts therocker handle 1e of the circuit breaker, but therocker handle 1e remains halted in the OFF position, thelimit switch 8a escapes from thecam groove 6f of the slidingbase 6, and the early closing contact is closed (ON operation). By this means, the coil of the electromagnet incorporated in the tripping unit 7 (seeFig. 2(a) ) of the undervoltage tripping device is excited by a current. - And, when rotation of the
rotary handle 4 is continued from the position ofFig. 7(b) toward the ON position, the slidingbase 6 presses therocker handle 1e of the circuit breaker which is integral with thepusher 6b, and midway in this movement stroke, the toggling mechanism (seeFig. 8 ) of the open/close mechanism 1d of the circuit breaker rapidly performs a reversal operation. By this means, the main circuit contact receives the biasing force of the open/close spring of the toggling mechanism and closes, and at the same time therocker handle 1e reaches the stroke end shown inFig. 7(e) , and halts at this ON position. The operation stroke of therocker handle 1e accompanying this closing operation of the main circuit contact is indicated by L2 in the figure. - Further, when the
rocker handle 1e of the circuit breaker reaches the ON position, therotary handle 4 of the externaloperating handle device 2 passes the ON position somewhat, as shown inFig. 7(c) , and after this overrun halts at the ON position ofFig. 7(d) . Further, accompanying this operation of therotary handle 4, the slidingbase 6 andpusher 8b pass throughFig. 7(g) to halt at the position ofFig. 7(h) . Thelimit switch 8a of the earlyclosing contact unit 8 holds the ON state even after the main circuit contact of the circuit breaker has closed, and maintains an excitation current in the electromagnet coil incorporated in the tripping unit 7 (seeFig. 2(a) ). - As is clear from the above explanation, the undervoltage tripping device of this embodiment combines a tripping
unit 7 and an earlyclosing contact unit 8, and so can exhibit the same operations and functions as the undervoltage tripping device with an early closing contact described inPatent Reference 2. Moreover, there is no need to install a dedicated rotary handle in the circuit breaker which links to the early closing contact, as described inPatent Reference 2, and merely by somewhat modifying the sliding base of the external operating handle device and additionally external mounting the above earlyclosing contact unit 8 on this external operating handle device, an existing internal type undervoltage tripping device (see Patent Reference 1) can be used as-is, and optional specifications for an undervoltage tripping device with an early closing contact function can be accommodated by simple means. By this means, circuit breaker manufacturers can reduce the number of optional products prepared as auxiliary devices for undervoltage tripping devices compared with previously, and costs entailed in stocking and management of such products can be reduced. - As described above, in an auxiliary device of a circuit breaker of this invention, an optional product related to an undervoltage tripping device is divided into a plurality of units and configured in advance, and units selected according to option specifications specified by a user can be combined and used with a circuit breaker, to enable accommodation of specifications with various options specified by simple means.
-
- 1
- Circuit breaker
- 1a
- Circuit breaker case
- 1e
- Rocker handle
- 2
- External operating handle device
- 3
- Base
- 4
- Rotary handle
- 6
- Sliding 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)
- An auxiliary device for a circuit breaker (1), which auxiliary device comprises an external operating handle device (2) and an undervoltage tripping device,
the undervoltage tripping device is divided into two modules, which are a tripping unit (7) comprising a tripping mechanism and
an early closing contact unit (8) comprising an early closing contact,
characterized in that;
the tripping unit (7) is adapted to be internally provided in a case (1a) of the circuit breaker (1),
the early closing contact unit (8) is externally provided on the external operating handle device (2) such that the early closing contact is linked to an internal mechanism of the external operating handle device (2), and
the early closing contact is closed midway during ON operation of the external operating handle device (2) and before a main circuit contact of the circuit breaker (1) closes. - The auxiliary device for a circuit breaker (1) according to Claim 1,
characterized in that the external operating handle device (2) comprises
a base (3) mounted on the case (1a) of the circuit breaker (1);
a rotary type handle (4);
a sliding base (6) which converts rotation of the handle (4) into linear motion and drives a rocker type handle (1e) of the circuit breaker (1) in ON and OFF directions;
a pusher (6b) installed on the sliding base (6) and opposed to the rocker type handle (1e) from the ON operation direction; and
a spring (6c) which biases the pusher (6b) from the rear, the external operating handle device (2) being configured with a backlash stroke set between the sliding base (6) and the pusher (6b), and
the movement of the sliding base (6) corresponding to the backlash stroke is captured and the early closing contact of the early closing contact unit (8) is caused to perform open/close operation, in the process of turning on the circuit breaker (1). - The auxiliary device for a circuit breaker (1) according to Claims 1 or 2, characterized in that the early closing contact unit (8) comprises
an assembly of a limit switch (8a) provided with the early closing contact, and
a frame (8b) with a terminal which holds the limit switch (8a), and
the frame (8b) is detachably mounted on a base (3) of the external operating handle device (2), and an operation end of the limit switch (8a) is linked to the sliding base (6) of the external operating handle device (2) at this mounted position.
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP2009276805A JP5310513B2 (en) | 2009-12-04 | 2009-12-04 | Circuit breaker accessory |
PCT/JP2010/006973 WO2011067922A1 (en) | 2009-12-04 | 2010-11-30 | Auxiliary device of circuit breaker |
Publications (3)
Publication Number | Publication Date |
---|---|
EP2509091A1 EP2509091A1 (en) | 2012-10-10 |
EP2509091A4 EP2509091A4 (en) | 2014-12-10 |
EP2509091B1 true EP2509091B1 (en) | 2016-04-13 |
Family
ID=44114784
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP10834376.5A Not-in-force EP2509091B1 (en) | 2009-12-04 | 2010-11-30 | Auxiliary device of circuit breaker |
Country Status (6)
Country | Link |
---|---|
EP (1) | EP2509091B1 (en) |
JP (1) | JP5310513B2 (en) |
KR (1) | KR101258534B1 (en) |
CN (1) | CN102576632B (en) |
TW (1) | TWI390571B (en) |
WO (1) | WO2011067922A1 (en) |
Families Citing this family (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP6123499B2 (en) * | 2013-06-04 | 2017-05-10 | 富士電機機器制御株式会社 | External circuit handle device for circuit breaker |
DE102018201913A1 (en) * | 2018-02-07 | 2019-08-08 | Siemens Aktiengesellschaft | Module for a rotary drive of an electrical switch, electrical switch with such a module and method for switching an electrical switch |
Family Cites Families (8)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP3503396B2 (en) | 1997-03-06 | 2004-03-02 | 三菱電機株式会社 | Circuit breaker |
JP2002324477A (en) * | 2001-04-27 | 2002-11-08 | Fuji Electric Co Ltd | Undervoltage trip device with quick close auxiliary switch for circuit breaker |
ITMI20011070A1 (en) * | 2001-05-22 | 2002-11-22 | Gewiss Spa | AUXILIARY DEVICE FOR MAGNETOTHERMAL SWITCH |
JP3867541B2 (en) | 2001-10-09 | 2007-01-10 | 富士電機機器制御株式会社 | Switchgear |
JP4032693B2 (en) * | 2001-10-19 | 2008-01-16 | 富士電機機器制御株式会社 | Undervoltage trip device with early-turn auxiliary switch for circuit breaker |
JP4215621B2 (en) * | 2003-11-17 | 2009-01-28 | 富士電機アセッツマネジメント株式会社 | External circuit handle device for circuit breaker |
JP2007134148A (en) | 2005-11-10 | 2007-05-31 | Fuji Electric Fa Components & Systems Co Ltd | External operation handle device of circuit breaker |
JP4735418B2 (en) * | 2006-05-29 | 2011-07-27 | 富士電機機器制御株式会社 | External circuit handle device for circuit breaker |
-
2009
- 2009-12-04 JP JP2009276805A patent/JP5310513B2/en not_active Expired - Fee Related
-
2010
- 2010-11-30 KR KR1020127008490A patent/KR101258534B1/en not_active IP Right Cessation
- 2010-11-30 WO PCT/JP2010/006973 patent/WO2011067922A1/en active Application Filing
- 2010-11-30 CN CN201080045254.5A patent/CN102576632B/en not_active Expired - Fee Related
- 2010-11-30 EP EP10834376.5A patent/EP2509091B1/en not_active Not-in-force
- 2010-12-03 TW TW099142141A patent/TWI390571B/en not_active IP Right Cessation
Also Published As
Publication number | Publication date |
---|---|
CN102576632B (en) | 2014-07-23 |
WO2011067922A1 (en) | 2011-06-09 |
EP2509091A4 (en) | 2014-12-10 |
KR20120058603A (en) | 2012-06-07 |
JP5310513B2 (en) | 2013-10-09 |
EP2509091A1 (en) | 2012-10-10 |
TW201126558A (en) | 2011-08-01 |
KR101258534B1 (en) | 2013-04-30 |
JP2011119163A (en) | 2011-06-16 |
CN102576632A (en) | 2012-07-11 |
TWI390571B (en) | 2013-03-21 |
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