EP3790033A1 - Relais de surcharge électronique et commutateur électromagnétique - Google Patents

Relais de surcharge électronique et commutateur électromagnétique Download PDF

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Publication number
EP3790033A1
EP3790033A1 EP20193409.8A EP20193409A EP3790033A1 EP 3790033 A1 EP3790033 A1 EP 3790033A1 EP 20193409 A EP20193409 A EP 20193409A EP 3790033 A1 EP3790033 A1 EP 3790033A1
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EP
European Patent Office
Prior art keywords
bus bar
overload relay
electronic overload
current
relay
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.)
Granted
Application number
EP20193409.8A
Other languages
German (de)
English (en)
Other versions
EP3790033B1 (fr
Inventor
Satoshi Yamazaki
Satoshi Machida
Takahiro Taguchi
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Fuji Electric FA Components and Systems Co Ltd
Original Assignee
Fuji Electric FA Components and Systems Co Ltd
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Fuji Electric FA Components and Systems Co Ltd filed Critical Fuji Electric FA Components and Systems Co Ltd
Publication of EP3790033A1 publication Critical patent/EP3790033A1/fr
Application granted granted Critical
Publication of EP3790033B1 publication Critical patent/EP3790033B1/fr
Active legal-status Critical Current
Anticipated expiration legal-status Critical

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Classifications

    • 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
    • H01H71/02—Housings; Casings; Bases; Mountings
    • H01H71/0264—Mountings or coverplates for complete assembled circuit breakers, e.g. snap mounting in panel
    • H01H71/0271—Mounting several complete assembled circuit breakers together
    • 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
    • H01H71/14—Electrothermal mechanisms
    • H01H71/18—Electrothermal mechanisms with expanding rod, strip, or wire
    • 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
    • H01H71/24—Electromagnetic mechanisms
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H47/00—Circuit arrangements not adapted to a particular application of the relay and designed to obtain desired operating characteristics or to provide energising current
    • 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
    • H01H71/08—Terminals; Connections
    • 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
    • H01H71/123—Automatic release mechanisms with or without manual release using a solid-state trip unit
    • H01H71/125—Automatic release mechanisms with or without manual release using a solid-state trip unit characterised by sensing elements, e.g. current transformers
    • 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
    • H01H71/02—Housings; Casings; Bases; Mountings
    • H01H71/0264—Mountings or coverplates for complete assembled circuit breakers, e.g. snap mounting in panel
    • H01H71/0271—Mounting several complete assembled circuit breakers together
    • H01H2071/0278—Mounting several complete assembled circuit breakers together with at least one of juxtaposed casings dedicated to an auxiliary device, e.g. for undervoltage or shunt trip

Definitions

  • the present invention relates to an electronic overload relay used for overload protection or the like, and an electromagnetic switch including the electronic overload relay.
  • Electronic overload relays include a current transformer (CT) for detecting a current flowing through a load, such as a motor or the like (for example, refer to International Publication No. WO 2005/139333 A1 , now registered as Japanese Patent No. 4738530 ).
  • CT current transformer
  • the operation section determines that an error, such as an overcurrent or the like, is generated, and outputs a trip signal, to operate a control circuit of an electromagnetic contactor, and open-circuit contacts.
  • the load can be guarded from a burnout (that is, protected), even when the overcurrent is generated.
  • an object in one aspect of the embodiments to provide an electronic overload relay and an electromagnetic switch, which can reduce the size thereof, while coping with both the AC and the DC.
  • an electronic overload relay includes a bus bar formed by a conductive metallic material, provided between an electromagnetic contactor and a load, or between a circuit breaker and the electromagnetic contactor; and a resistor part arranged between one end and the other end of the bus bar, and including a shunt resistor for detecting a value of a current flowing through the bus bar.
  • an electromagnetic switch includes the electronic overload relay described above, and the electromagnetic contactor to which the bus bar is connected.
  • the expressions parallel, perpendicular, horizontal, vertical, up-and-down, left-to-right, or the like, used to describe the direction may include a deviation that does not impair the effects of the present invention.
  • An X-axis direction, a Y-axis direction, and a Z-axis direction represent the direction parallel to the X-axis direction, the direction parallel to the Y-axis direction, and the direction parallel to the Z-axis, respectively.
  • the X-axis direction, the Y-axis direction, and the Z-axis direction are perpendicular to each other.
  • An XY-plane, a YZ-plane, and a ZX-plane represent the virtual plane parallel to the X-axis direction and the Y-axis direction, the virtual plane parallel to the Y-axis direction and the Z-axis direction, and the virtual plane parallel to the Z-axis direction and the X-axis direction, respectively.
  • the direction of the X-axis direction indicated by an arrow is regarded as a plus X-axis (+X-axis) direction, and the direction opposite to the +X-axis direction is regarded as a minus X-axis (-X-axis) direction.
  • the direction of the Y-axis direction indicated by an arrow is regarded as a plus Y-axis (+Y-axis) direction, and the direction opposite to the +Y-axis direction is regarded as a minus Y-axis (-Y-axis) direction.
  • the direction of the Z-axis direction indicated by an arrow is regarded as a plus Z-axis (+Z-axis) direction, and the direction opposite the +Z-axis direction is regarded as a minus Z-axis (-Z-axis) direction.
  • FIG. 1 is an outline view of an electromagnetic switch including an electronic overload relay according to one embodiment of the present invention.
  • an electromagnetic switch 100 includes an electromagnetic contactor 10 that is provided for protective coordination with a circuit (or wiring) breaker provided on a power supply side, and an electronic overload relay 20 that is connected in series with the electromagnetic contactor 10.
  • the electronic overload relay 20 is installed to prevent a burnout or the like of the load caused by continued overload state.
  • the load is a motor or the like, for example, but may any load that is driven by AC power or DC power.
  • the electronic overload relay 20 is utilized in combination with the electromagnetic contactor 10, similar to a typical thermal relay (or thermal overload relay) utilizing mechanical contacts.
  • the typical thermal relay is an overload relay having built-in bimetal and heat element, and is also referred to as a "thermal overload relay" because the relay is operated by heat.
  • the thermal relay uses a bimetal formed by 2 laminated metals having different coefficients of expansion, such as brass and amber, and the bimetal bends when the brass expands as the temperature rises. When an overcurrent flows through a heat element (winding) that is provided on the bimetal and the bimetal is deformed thereby, the thermal relay performs trip operation to open-circuit contacts of the electromagnetic contactor 10, and interrupt a current supply from the power supply to the load.
  • the electronic overload relay 20 may be referred to as an "electronic thermal relay", or simply an “overload relay”, which is a semiconductor switch and relay, or an overload relay utilizing a contact switch and relay.
  • the most standard element to be protected by the electronic overload relay 20 is the overload element.
  • the causes of the overload are diverse, and may include cases where the load becomes large, a current that is excessively large compared to a prescribed current flows due to a short-circuit fault, or the like, for example.
  • the load may reach a high temperature and cause a burnout fault, and thus, a circuit (main circuit) must be cut off immediately.
  • a large starting current generated at the start of the operation, must be taken into consideration.
  • a starting current that is larger than those of the conventional IE1 and IE2 motors flows for several seconds.
  • the motor will not be damaged by this large starting current, it may become impossible to start the operation of the motor when the overload element acts thereon.
  • an operating time of the electronic overload relay 20 is set so as not to operate until a time when this starting current is generated.
  • the setting of the operating time includes a setting that tolerates the overload for a predetermined time similar to the protection upon starting, and a setting that instantaneously cuts off during times other than the starting, however, the setting is desirably selected according to the load of interest.
  • the electronic overload relay 20 includes functions similar to those of the general overload relay, such as a trip function in which an internal contact mechanism performs a trip operation when the overcurrent flows through the load, a manual reset (or manual return) function in which the operation is manually reset (or returned) to a steady state after the trip operation, and an automatic reset (or automatic return) function in which the operation is automatically reset (or returned) to the steady state after a predetermined time elapses, or the like, for example.
  • the electronic overload relay 20 may be switched between the automatic reset and the manual reset.
  • FIG. 2 is an enlarged view of the shunt integrated bus bar illustrated in FIG. 1 .
  • FIG. 2 illustrates one of the three shunt integrated bus bars 30 illustrated in FIG. 1 , but the remaining two shunt integrated bus bars 30 have configurations similar to that of the shunt integrated bus bar 30 illustrated in FIG. 2 .
  • the shunt integrated bus bar 30 is an electrically conductive member in which a resistor part 40 that is a shunt resistor (that is, includes a shunt resistor), is integrated on a bus bar base 300.
  • the bus bar base 300 is a plate-shaped conductive member formed by a high-conductivity metallic material for conducting a large amount of current, such as Cu, Cu-Zn alloys, or the like.
  • two insertion holes 30a and 30b, and a resistor part 40 are formed in the bus bar base 300.
  • the insertion holes 30a and 30b penetrate the bus bar base 300 in the Z-axis direction, and screws are inserted through the insertion holes 30a and 30b.
  • the screws are fastening members for fixing the shunt integrated bus bar 30 to the electronic overload relay 20.
  • the insertion hole 30a is formed in a portion of the bus bar base 300 near a first end 31 along the plus X-axis direction.
  • the insertion hole 30b is formed in a portion of the bus bar base 300 near a second end 32 along the minus X-axis direction.
  • the resistor part 40 is a resistor made of a resistive material such as Cu-Mn-Ni alloys, Cu-Ni alloys, Ni-Cr alloys, or the like.
  • manganin registered trademark
  • Manganin is a resistive material composed of copper (86%), manganese (12%), and nickel (2%), for example.
  • Manganin is non-magnetic, has a high resistivity, and has a low temperature coefficient of resistance compared to that of a metallic material, such as Cu or the like, which forms the bus bar base 300.
  • the resistor part 40 is provided at a center part of the bus bar base 300 along the X-axis direction, for example.
  • the center part of the bus bar base 300 corresponds to a region, located within the entire bus bar base 300, that divides the bus bar base 300 into two halves with respect to the X-axis direction.
  • the position of the resistor part 40 is not limited to the central part of the bus bar base 300, and may be located in a region closer to the insertion hole 30a than the central part, or in a region closer to the insertion hole 30b than the central part.
  • Two conductive wires 51 and 52 are electrically connected to respective sides of the resistor part 40.
  • first ends of the wires 51 and 52 are connected near ends of the resistor part 40 along the plus-X-axis direction and the minus-X-axis direction, respectively.
  • both ends of the resistor part 40 correspond to connecting parts between the resistor part 40 and the bus bar base 300, or parts near the resistor part 40 within the entire bus bar base 300.
  • Second ends of the wires 51 and 52, opposite to the first ends, are connected to a detector provided on the printed circuit board 50. Details of the detector will be described later.
  • the resistor part 40 Since the resistor part 40 has a resistance value that is low to an extent that enables detection of a current, it is necessary to make certain that the resistor part 40 does not affect the accuracy, stability, or the like of the current detection. For example, when the wires 51 and 52 are connected to positioned separated from the resistor part 40, such as positions near the insertion holes 30a and 30b, for example, a voltage drop due to the resistance of the bus bar base 300 is also detected, which may result in a large current detection error. In addition, when the temperature coefficient of resistance of the bus bar base 300 is large, the resistance value of the bus bar base 300 varies in response to a slight temperature change, and the current detection error may also be caused by the variation in the resistance value of the bus bar base 300.
  • the wires 51 and 52 are preferably connected to the connecting parts between the resistor part 40 and the bus bar base 300, or to the parts near the resistor part 40 within the entire bus bar base 300.
  • the wires 51 and 52 are electrically connected to the resistor part 40.
  • the resistor part 40 may be electrically connected to the detector by means other than the wires 51 and 52.
  • a conductive pin, a copper bar, a soldering, a connector, or the like may be used to electrically connect the resistor part 40 to the detector.
  • a plate-shaped conductive member formed by copper is butt welded on both sides of a plate-shaped resistive alloy including manganin, for example, to form an interface (or joint area).
  • the welded plate-shaped composite member is shaped into a strip to form a vertically elongated shunt integrated bus bar 30 as illustrated in FIG. 2 .
  • the method of manufacturing the shunt integrated bus bar 30 is not limited to the manufacturing method described above.
  • a resistive alloy film may be etched and formed, as the resistive material, on a base substrate that is formed by copper, aluminum, or the like having a low resistivity.
  • the shunt integrated bus bar 30 may also be manufactured by connecting a chip-shaped resistor formed by a material having a micro-electrical resistance, such as a copper-nickel alloy, for example, to the bus bar base 300 formed by a material having a resistivity lower than that of the chip-shaped resistor, such as a copper alloy, and joining boundary portions of the chip-shaped resistor and the bus bar base 300 by compression bonding or crimping, for example.
  • FIG. 3 is a diagram illustrating a circuit configuration of the electromagnetic switch.
  • FIG. 3 illustrates a schematic configuration of the electromagnetic switch 100 including the electronic overload relay.
  • the electromagnetic contactor 10 and the electronic overload relay 20 forming the electromagnetic switch 100 are connected in series to electrical circuits (of three phases R, S, and T) between the power supply 200 and the load 400.
  • the electromagnetic contactor 10 includes a housing, a fixed core provided inside the housing, a movable core arranged to oppose the fixed core, and a coil arranged on an outer periphery of a main leg of the fixed core. When the coil is energized and the movable core is attracted toward the fixed core, a closing operation of a movable contact and a fixed contact of a fixed contactor is performed.
  • the electronic overload relay 20 includes the resistor part 40, the printed circuit board 50, or the like.
  • the printed circuit board 50 includes a detector 1, a operation section 4, a power supply section 2, an operation current adjuster 3, an electromagnet section (for example, a solenoid section) 5, an a-contact 6, a b-contact 7, or the like, for example.
  • Constituent elements of the printed circuit board 50 are examples, and the configuration of the electronic overload relay 20 according to this embodiment is not limited thereto.
  • the detector 1 detects a voltage across both ends of the resistor part 40 (that is, a potential difference in accordance with the value of the current flowing to the resistor part 40), through the wires 51 and 52.
  • the operation section 4 determines that an overcurrent is generated, based on the potential difference detected by the detector 1, the operation section 4 inputs a trip signal 4a to the power supply section 2.
  • the power supply section 2 includes a trip capacitor for accumulating a charge by inputting the current flowing through the resistor part 40, for example, and discharges the charge accumulated in the trip capacitor when the trip signal 4a is input thereto. Accordingly, the contact mechanism may be caused to perform the trip operation by driving the electromagnet section 5.
  • the main circuit By driving the normally open contact (a-contact 6) by the trip operation, for example, an indicator lamp (not illustrated) for notifying a user of the trip operation is turned on, and by driving the normally closed contact (b-contact 7), the main circuit is open-circuited by releasing the energized coil of the electromagnetic contactor 10 provided in the main circuit. By open-circuiting the main circuit, the burnout or the like of the load 400 can be prevented.
  • the operation section 4 may be configured to vary a determination value for detecting the overcurrent (a value for setting a determination voltage) by varying a variable resistance value provided in the operation current adjustor 3, for example. As a result, it is possible to cope with various rated loads (for example, loads having set currents).
  • the operation section 4 When a predetermined time elapses after the trip operation, the operation section 4 inputs a reset signal to the power supply section 2, so as to drive the electromagnet section 5 by a discharge of a reset capacitor of the power supply section 2, and cause the contact mechanism to perform a reset operation.
  • the electronic overload relay 20 is an external power supply type overload relay
  • power is supplied from a power supply wiring provided separately from the main circuit, even when the main circuit is cut off by the electromagnetic contactor 10 after the trip operation. For this reason, the steady state or the tripped state can be maintained, or both the steady state and the tripped state can be maintained, by the magnetic attraction of the electromagnet.
  • the electronic overload relay 20 is a self-powered overload relay, and the main circuit is cut off by the electromagnetic contactor 10 after trip operation, power is no longer supplied. Consequently, only the small amount of power accumulated in the capacitor or the like can be used to maintain the steady state or the tripped state. For this reason, the magnetic attraction of a permanent magnet or a mechanical mechanism may be used to maintain the steady state. Alternatively, an automatic reset operation may be performed and the steady state may be maintained, without using the permanent magnet, as described in Japanese Laid-Open Patent Publication No. 2006-332001 , for example.
  • JIS C 8201-4-1 prescribes that the operation takes 2 seconds to 30 seconds to start through a current that is 600% of the set current, the operation is performed within 4 minutes through a current that is 200% of the set current after the temperature becomes constant through the set current, the operation is not performed through the set current and the operation is performed within 2 hours through a current that is 125% of the set current after the temperature becomes constant, or the like.
  • FIG. 4 is a diagram illustrating a circuit configuration of the comparison example of the electromagnetic switch illustrated in FIG. 1 .
  • An electromagnetic switch 100A according to the comparison example includes a CT 70 in place of the shunt integrated bus bar 30.
  • the CT 70 is provided on the bus bar base 300.
  • an alternating (AC) current flows through the bus bar base 300 (primary side)
  • an alternating (AC) current in accordance with the number of turns flows through a secondary winding of the CT 70, so as to cancel a magnetic flux generated inside the magnetic core of the CT 70.
  • This AC current flows through the shunt resistor (not illustrated), and the operation section 4 determines the overcurrent based on the voltage generated across both ends of the shunt resistor.
  • the electromagnetic switch 100A according to the comparison example is configured to detect the overcurrent using the CT 70 having the magnetic core or the like, the current detector becomes physically large.
  • the CT 70 cannot detect a direct current (DC current)
  • DC current direct current
  • the load 400 to which the DC power is input may be an inverter or the like to which the DC power is input and converted into AC power for driving a motor, for example.
  • the electromagnetic switch 100 since the electromagnetic switch 100 according to this present embodiment uses the shunt integrated bus bar 30, it is possible to reduce the size of the current detector, and to reduce the size of the electronic overload relay 20. Hence, the electromagnetic switch 100 can be mounted on a compact switchboard, for example, without being constrained by the size of the electronic overload relay 20.
  • the electronic overload relay 20 copes with both the AC and the DC, it is possible to increase the production of the electronic overload relay 20 having the same specifications, when compared to separately manufacturing the electronic overload relay that copes with the AC and the electronic overload relay that copes with the DC. Accordingly, it is possible to reduce the cost of the electronic overload relay 20, by mass production of the electronic overload relays 20.
  • the configuration of the shunt integrated bus bar 30 is simple compared to that of the CT 70, it is possible to facilitate managing of manufacturing tolerances of the shunt integrated bus bar 30. As a result, the yield of the current detector can be improved, and it is possible to further reduce the manufacturing cost of the electronic overload relay.
  • the shunt integrated bus bar 30 may be configured as described below in conjunction with FIG. 5 through FIG. 8 .
  • FIG. 5 through FIG. 8 those parts that are the same as those corresponding parts illustrated in FIG. 2 are designated by the same reference numerals, a description of the same parts will be omitted, and only the parts that differ will be described.
  • FIG. 5 is a diagram illustrating the shunt integrated bus bar according to a first modification.
  • a shunt integrated bus bar 30-1 according to the first modification includes a bus bar base 300A, and the resistor part 40.
  • the bus bar base 300A is a conductive member in which two crank members are joined together. More particularly, the bus bar base 300A includes a first crank conductor 301 and a second crank conductor 302, which are crank-shaped conductive members arranged line symmetrically (or in axial symmetry) with respect to a virtual line VL1.
  • the virtual line VL1 is parallel to the Z-axis direction, and passes through the center part of the bus bar base 300A along the X-axis direction.
  • the center part of the bus bar base 300A corresponds to the region, located within the entire bus bar base 300A, that divides the bus bar base 300A into two halves with respect to the X-axis direction.
  • the resistor part 40 is provided at the center part of the bus bar base 300A.
  • the resistor part 40 is provided between the first crank conductor 301 and the second crank conductor 302 that are arranged line symmetrically with respect to the virtual line VL1.
  • the resistor part 40 is provided at a bottom portion 303a of a U-shaped conductor portion 303 that is formed to a generally U-shape by the first crank conductor 301 and the second crank conductor 302.
  • the U-shaped conductor portion 303 is a conductive member that is arranged and fitted inside the housing forming the electronic overload relay 20.
  • the U-shaped conductor portion 303 fitted inside the housing include a state where the conductive member is fitted into and positioned by a positioning groove formed inside the housing, a state where the conductive member is fitted onto and positioned by a positioning projection formed inside the housing, or the like, for example.
  • the conductive portion having the generally U-shape (that is, the U-shaped conductor portion 303) is formed by combining two crank-shaped conductive members.
  • the U-shaped conductor portion 303 When the U-shaped conductor portion 303 contacts (or fits) inside the housing of the electronic overload relay 20, the U-shaped conductor portion 303 makes contact with and is positioned inside the housing of the electronic overload relay 20, even when the rotation moment acts on the ends of the bus bar base 300A. For this reason, even when the screws 60 are tightened with a large tightening torque, a movement of the U-shaped conductor portion 303 inside the housing is restricted. Hence, a misalignment or positional error of the bus bar base 300A connected to the resistor part 40 can be reduced.
  • the welded portion between the resistor part 40 and the bus bar base 300A are less affected by the tightening of screws 60, to thereby reduce the deterioration in the current detection accuracy.
  • FIG. 6 is a diagram illustrating the shunt integrated bus bar according to a second modification.
  • the difference from the shunt integrated bus bar 30-1 illustrated in FIG. 5 is the position of the resistor part 40.
  • the resistor part 40 is provided near a distal end 303c of the U-shaped conductor portion 303, on the side of an opening 303b of the entire U-shaped conductor portion 303.
  • a width of the bottom portion 303a of the U-shaped conductor portion 303 along the X-axis direction becomes narrow. Accordingly, if the resistor part 40 were provided at the bottom portion 303a, the interface between the resistor part 40 and the bus bar base 300A may crack when the bus bar base 300A is bent into the crank-shape during the manufacturing stage.
  • the resistor part 40 when the resistor part 40 is provided near the distal end 303c of the U-shaped conductor portion 303, the resistor part 40 can be provided at a portion other than the bottom portion 303a of the U-shaped conductor portion 303.
  • the same effects obtainable by the shunt integrated bus bar 30-1 illustrated in FIG. 5 are also obtainable, and further, the design conditions of the shunt integrated bus bar 30-2 can have more degree of freedom.
  • FIG. 7 is a diagram illustrating the shunt integrated bus bar according to a third modification.
  • the differences from the shunt integrated bus bar 30-1 illustrated in FIG. 5 are that a bus bar 30-3 uses a bus bar base 300B having one first crank conductor 301, and that the resistor part 40 is provided at a different location. More particularly, the resistor part 40 is provided at a portion excluding two bent portions, namely, a first bent portion 305 and a second bent portion 306 respectively having the crank shape, among the entire bus bar base 300B.
  • the portion excluding the two bent portions corresponds, for example, to a plate-shaped conductor portion 304 provided in a region between the second bent portion 306 and the second end 32 in the minus X-axis direction of the bus bar base 300B.
  • the resistor part 40 is provided at an intermediate portion of the plate-shaped conductor portion 304, for example.
  • the portion excluding the two bent portions may be a plate-shaped conductor portion provided in a region between the first bent portion 305 and the first end 31 in the plus-X-axis direction of the bus bar base 300B.
  • the second bent portion 306 and the plate-shaped conductor portion 304 are arranged inside the housing forming the electronic overload relay 20, similar to the U-shaped conductor portion 303 described above, and are fitted into a positioning groove formed inside the housing, or fitted on to make contact with a positioning projection formed inside the housing, for example.
  • the interface between the plate-shaped conductor portion 304 and the resistor part 40 is less affected by the tightening of screws 60.
  • the shunt integrated bus bar 30-3 has a simplified structure compared to the shunt integrated bus bar 30-1 described above, a time required for the bending process is shortened, and it is possible to further facilitate managing of manufacturing tolerances of the shunt integrated bus bar 30-3. As a result, the yield of the current detector can further be improved, and the manufacturing cost of the electronic overload relay can be further be reduced.
  • FIG. 8 is a diagram illustrating the shunt integrated bus bar according to a fourth modification.
  • the difference from the shunt integrated bus bar 30-3 illustrated in FIG. 7 is the position of the resistor part 40.
  • the resistor part 40 is provided in a region between the first bent portion 305 and the second bent portion 306.
  • the region between the first bent portion 305 and the second bent portion 306 corresponds to a plate-shaped conductor portion 307 extending in a depth direction of the electronic overload relay 20.
  • the width of the plate-shaped conductor portion 304 along the X-axis direction, extending from one insertion hole 30a toward the other insertion hole 30b may become narrow. Accordingly, it may not be possible to secure a sufficient space in the plate-shaped conductor portion 304 for forming the resistor part 40.
  • the resistor part 40 may be provided on the portion of the entire first crank conductor 301 extending in the Z-axis direction, that is, on the plate-shaped conductor portion 307 extending in the depth direction of the electronic overload relay 20. For this reason, the same effects obtainable by the shunt integrated bus bar 30-3 illustrated in FIG. 7 are obtainable, and further, the design conditions of the shunt integrated bus bar 30-4 can have more degree of freedom.
  • the electronic overload relays include a bus bar provided between an electromagnetic contactor and a load and formed by a conductive metallic material, and a resistor arranged in between one end and the other end of the bus bar, and including a shunt resistor for detecting a value of a current flowing through the bus bar.
  • a bus bar provided between an electromagnetic contactor and a load and formed by a conductive metallic material
  • a resistor arranged in between one end and the other end of the bus bar, and including a shunt resistor for detecting a value of a current flowing through the bus bar.
  • the shunt resistor is connected to the bus bar, it is possible to significantly reduce the manufacturing cost of the electronic overload relay, while reducing the size of the current detector.
  • the electronic overload relay may be realized as a thermal relay, it is possible to contribute to the size reduction of the control panel, unlike the conventional separately provided unit.
  • a monitoring relay is known as a device mounted with a shunt resistor on the current detector.
  • the current coping range is several A to approximately 10 A and narrow, because of the configuration in which the shunt resistor is mounted on the printed circuit board.
  • the current coping range can be several tens of A to several hundred A, by forming the current detector by the bus bar type shunt resistor.
  • thermal relay since thermal relay is used in combination with the contactor, a configuration in which the two are integrated with each other may be required in the form of a product.
  • the monitoring relay is conventionally only available in the form of a separate unit.
  • the configuration in which the thermal relay and the contactor are integrated with each other can be realized with a compact size.
  • the conventional electronic thermal relay using the CT is of course designed and manufactured according to specifications that satisfy the standard requirements, but basically only has a protection function against application to the line-start motor. For this reason, although it is possible to cope with the general load or the IE3 motor with an average starting current, it is necessary to use an expensive separate unit (monitoring relay, for example) having higher functions in order to cope with a special load or the IE3 motor with a high starting current. However, such a separate unit has a narrow current coping range of several A to approximately 10 A, and is not suited for achieving the size reduction of the control panel because of the separate configuration thereof.
  • a product in the category of the generally used thermal relay can cope with a DC load and a special AC load (that is, load with a wide current variation width), and contribute to the size reduction of the control panel.
  • the overload protection is provided by a DC circuit breaker in a high layer of a DC part within the control panel, or a DC fuse that cannot be reused after the protection.
  • the DC load can be monitored, measured, and protected for each reusable branch circuit in a layer lower than the DC circuit breaker, which is ideal for the safety design of the DC circuit.
  • the coping current range can be set to several tens of A to several hundred A.
  • the thermal relay having the contact integrated configuration it is possible to reduce the size of the product, and enable the size reduction of the control panel.
  • FIG. 9 is a diagram illustrating an example of an internal configuration of the distribution panel.
  • FIG. 10 is an outline view of the electromagnetic switch according to a modification.
  • a distribution panel 600 illustrated in FIG. 9 includes a circuit breaker 81, an electromagnetic switch 100B, or the like.
  • the distribution panel 600 may be included in the control panel.
  • the circuit breaker 81 is connected to the power supply 200 via a wiring 80.
  • a wiring 82 is connected to a secondary side (that is, the load side) of the circuit breaker 81.
  • One end of the shunt integrated bus bar 30 is connected to the wiring 82.
  • the shunt integrated bus bar 30 is provided in the electronic overload relay 20 of the electromagnetic switch 100B.
  • the electromagnetic switch 100B includes the electromagnetic contactor 10 and the electronic overload relay 20, and the electronic overload relay 20 is provided on the side of the power supply 200 of the electromagnetic contactor 10, that is, between the circuit breaker 81 and the electromagnetic contactor 10 illustrated in FIG. 9 .
  • the circuit breaker 81 is electrically connected to the electronic overload relay 20 of the electromagnetic switch 100B, through the wiring 82 and the shunt integrated bus bar 30.
  • the other end of the shunt integrated bus bar 30 is connected to the electromagnetic contactor 10.
  • the shunt integrated bus bar 30 is used in the distribution panel 600, it is possible to use any one of the shunt integrated bus bar 30-1, the shunt integrated bus bar 30-2, the shunt integrated bus bar 30-3, and the shunt integrated bus bar 30-4 described above, in place of the shunt integrated bus bar 30.
  • a first advantage is that, because a voltage is applied to the electronic overload relay 20 when the circuit breaker 61 is turned on, and the voltage is not applied to the electronic overload relay 20 when the circuit breaker 61 is turned off, the electronic overload relay 20 can monitor the state of the circuit breaker 61, that is, whether the circuit breaker 61 is on or off, by detecting the voltage value.
  • a second advantage is that the electronic overload relay 20 can monitor the phase sequence state (that is, perform voltage phase-reversal monitoring) of the power supply by detecting the voltage value. In a case where the electronic overload relay 20 is connected to the load side of the electromagnetic contactor 10, the voltage phase-reversal monitoring cannot be performed.
  • a third advantage is that when the electronic overload relay 20 receives the supply of power from the main circuit, the electronic overload relay 20 can continue to operate regardless of the state (on/off) of the electromagnetic contactor 10. In the case where the electronic overload relay 20 is connected to the load side of the electromagnetic contactor 10, the electronic overload relay 20 cannot continue to operate when the electromagnetic contactor 10 is turned off.
  • FIG. 11A is a diagram illustrating a first configuration example of the electromagnetic contactor having the coil terminals.
  • FIG. 11B is a diagram illustrating a second configuration example of the electromagnetic contactor having the coil terminals.
  • the electromagnetic contactor 10 is provided with coil terminals 83 for inputting a control signal to control the on (or short-circuiting) operation or the off (or open-circuiting) operation.
  • the connection is facilitated when providing the control function of the electromagnetic contactor 10 in the electronic overload relay 20.

Landscapes

  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • Emergency Protection Circuit Devices (AREA)
  • Breakers (AREA)
EP20193409.8A 2019-09-05 2020-08-28 Relais de surcharge électronique et commutateur électromagnétique Active EP3790033B1 (fr)

Applications Claiming Priority (1)

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JP2019162258A JP2021040469A (ja) 2019-09-05 2019-09-05 電子式過負荷リレー及び電磁開閉器

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EP3790033A1 true EP3790033A1 (fr) 2021-03-10
EP3790033B1 EP3790033B1 (fr) 2022-09-14

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JP (1) JP2021040469A (fr)
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Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4346424A (en) * 1980-02-22 1982-08-24 Eaton Corporation Electronic remote control D.C. power controller and circuit breaker
DE19516723A1 (de) * 1995-05-06 1996-11-14 Kloeckner Moeller Gmbh Thermo-magnetische Auslöseeinrichtung
JP2006332001A (ja) 2005-05-30 2006-12-07 Mitsubishi Electric Corp サーマルリレー
DE102006025607A1 (de) * 2006-05-24 2007-11-29 Friedrich Lütze Gmbh & Co. Kg Vorrichtung zum selbsttätigen Abschalten oder Schalten eines elektrischen Verbrauchers
GB2462421A (en) * 2008-08-04 2010-02-10 Deepstream Technologies Ltd Power supply unit for overload relay
JP4738530B2 (ja) 2007-04-27 2011-08-03 三菱電機株式会社 電子式過負荷継電器

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JPH0483175A (ja) * 1990-07-25 1992-03-17 Mitsubishi Electric Corp 電流検出装置
JPH06325675A (ja) * 1993-05-13 1994-11-25 Hitachi Ltd 電磁接触器および電磁開閉器
KR200311920Y1 (ko) * 2003-01-29 2003-05-01 제일이.엔.피(주) 조립식 배전반
DE102006005697A1 (de) * 2006-02-08 2007-08-16 Moeller Gmbh Einrichtung zum Auslösen eines elektrischen Schaltgeräts
JP2015025694A (ja) * 2013-07-25 2015-02-05 矢崎総業株式会社 シャント抵抗式電流センサ
JP2016197981A (ja) * 2015-04-06 2016-11-24 株式会社Ｎｔｔファシリティーズ 遮断器制御システム、電源制御システム、遮断器制御方法、及びプログラム
JPWO2018168981A1 (ja) * 2017-03-17 2020-01-16 三洋電機株式会社 電流検出器

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4346424A (en) * 1980-02-22 1982-08-24 Eaton Corporation Electronic remote control D.C. power controller and circuit breaker
DE19516723A1 (de) * 1995-05-06 1996-11-14 Kloeckner Moeller Gmbh Thermo-magnetische Auslöseeinrichtung
JP2006332001A (ja) 2005-05-30 2006-12-07 Mitsubishi Electric Corp サーマルリレー
DE102006025607A1 (de) * 2006-05-24 2007-11-29 Friedrich Lütze Gmbh & Co. Kg Vorrichtung zum selbsttätigen Abschalten oder Schalten eines elektrischen Verbrauchers
JP4738530B2 (ja) 2007-04-27 2011-08-03 三菱電機株式会社 電子式過負荷継電器
GB2462421A (en) * 2008-08-04 2010-02-10 Deepstream Technologies Ltd Power supply unit for overload relay

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CN112447457A (zh) 2021-03-05
KR20210029099A (ko) 2021-03-15
JP2021040469A (ja) 2021-03-11
EP3790033B1 (fr) 2022-09-14

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