EP3859763A1 - Dispositif de surveillance de tension - Google Patents

Dispositif de surveillance de tension Download PDF

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Publication number
EP3859763A1
EP3859763A1 EP20154631.4A EP20154631A EP3859763A1 EP 3859763 A1 EP3859763 A1 EP 3859763A1 EP 20154631 A EP20154631 A EP 20154631A EP 3859763 A1 EP3859763 A1 EP 3859763A1
Authority
EP
European Patent Office
Prior art keywords
linkage
solenoid
monitoring device
voltage monitoring
voltage
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
EP20154631.4A
Other languages
German (de)
English (en)
Other versions
EP3859763B1 (fr
Inventor
Arda Tüysüz
Sebastian Breisch
Holger Reutner
Boris Schulmann
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.)
ABB Schweiz AG
Original Assignee
ABB Schweiz AG
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 ABB Schweiz AG filed Critical ABB Schweiz AG
Priority to EP20154631.4A priority Critical patent/EP3859763B1/fr
Priority to CN202110124981.0A priority patent/CN113205981A/zh
Publication of EP3859763A1 publication Critical patent/EP3859763A1/fr
Application granted granted Critical
Publication of EP3859763B1 publication Critical patent/EP3859763B1/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
    • 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
    • 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
    • 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 a device for monitoring an input voltage and for tripping an appropriate action if the input voltage drops below a predetermined threshold.
  • a common device of this type is referred to as an undervoltage release and functions to switch off a consumer of electrical power if an input voltage to the undervoltage release drops below predetermined first switching level, and to switch on the consumer or at least to emable it to resume operation it when the input voltage has returned to a second switching level.
  • an undervoltage release comprises input connectors for receiving the input voltage, a linkage, a spring for urging the linkage towards a first stable position, a solenoid powered by the input voltage and adapted to displace the linkage from the first position to a second position if a voltage applied to the solenoid exceeds a switching-on threshold, and to maintain the linkage in the second position while the voltage applied to the solenoid exceeds a switching-off threshold lower than the switching-on threshold, and a switch controlled by the linkage.
  • the switch controls whether the input power is supplied to the consumer or not.
  • a certain difference between the two thresholds is necessary in order to prevent the device from toggling when the input voltage is close to the thresholds.
  • the difference is large, and a strong current that is needed in order to bring the linkage into the second position is maintained continuously while the linkage is held in the second position, electric power is consumed unnecessarily, possibly overheating the solenoid.
  • DE 201 10 741 U1 discloses an undervoltage release device in which the magnetic field of the solenoid at a time in which the solenoid is drawing the linkage towards the second position can be stronger than when it has reached the second position.
  • This device uses a resistor and a capacitor connected in parallel to each other and in series with the solenoid. In a steady state, while the input voltage is constant, no current flows through the capacitor. When there is a rise in the input voltage, current flowing through the capacitor will add to the current through the resistor. However, this will have a noticeable effect only if the capacitor is big enough to provide a noticeable increase in current before being charged up to a stable voltage level defined by the final value of the input voltage and the values of the other components of the circuit .
  • the prior art device needs a large and expensive capacitor, the lifetime of which tends to be limited, in particular if used at elevated temperatures. Further, the effect of the capacitor varies depending on the rate of change of the input voltage, whereas that of the undervoltage release device should depend on input voltage level alone.
  • a voltage monitoring device comprising input connectors for receiving an input voltage, a linkage, a spring for urging the linkage towards a first stable position, and a solenoid powered by the input voltage and adapted to displace the linkage from the first position to a second position if a voltage applied to the solenoid exceeds a first threshold, and to maintain the linkage in the second position while the voltage applied to the solenoid exceeds a second threshold lower than the first threshold, and a switch controlled by the linkage, in which the switch is connected not to a consumer but to the input connectors and the solenoid so as apply a first percentage of the input voltage to the solenoid in a steady state in which the linkage is in the first position and to apply a second percentage of the input voltage to the solenoid in a steady state in which the linkage is in the second position, the second percentage being less than the first percentage.
  • the percentages will be less than 100%, but this is not necessarily so; it would be conceivable to provide a voltage booster between the input connectors and the solenoid, so that one or both of the threshold voltages could be higher than the input voltage.
  • the switch can be connected so as to connect a resistor in series with the solenoid when the linkage is in the second position, whereas the resistor is idle or at least has a reduced current flowing through it when the linkage is in the first position.
  • the switch preferably is a mechanical switch, i.e. it comprises first and second contact pads that are in physical and electrical contact while the linkage is in the first position, and that are spaced from each other while the linkage is in the second position.
  • a shunt diode can be connected in parallel to the solenoid in order to suppress voltage oscillations that might arise under transient conditions and might cause the linkage to move in an unexpected way.
  • a second switch for controlling the supply of the input power to a consumer can be integrated into an embodiment of the voltage monitoring device.
  • the device can be designed to control an external switch.
  • a device may comprise a casing from which a portion of the linkage projects, the displacement of which can be used for operating the external switch.
  • control devices such as undervoltage releases and circuit breakers come in casings having two parallel flat sidewalls and a narrow side provided with a rail mount, by which a plurality of such devices can be mounted side by side on a shared rail.
  • a rail mount by which a plurality of such devices can be mounted side by side on a shared rail.
  • the above-mentioned projecting portion projects from one of the flat sides, it can engage in an adjacent device and control it.
  • the projecting portion is a shaft and is rotatable about an axis extending in the longitudinal direction of the rail.
  • Such a projecting portion is easy to mount since the sidewalls of the casing can serve as bearings.
  • the angle of rotation between the two positions of the shaft should not be too small, in order to enable reliable control of the adjacent device in spite of possible tolerances.
  • This is can be achieved by a linkage comprising first and second displaceable members, wherein the shaft is part of the second displaceable member driven to rotate by the solenoid via the first displaceable member. The closer to the axis a connection between the first and second parts is located, the larger will be the angle of rotation of the shaft associated to a given displacement of the first displaceable member.
  • the displaceable members can be coupled by a pin of one of the first and second displaceable members engaging a an edge of the other.
  • a straight line that connects first and second positions of the pin should be located so that there is a radius that extends from the axis and intersects the line orthogonally.
  • the spring is preferably helicoidal. Such a spring can be accommodated adjacent to the solenoid and substantially parallel to it.
  • the helicoidal spring can be accomodated in a cavity of the first displaceable member.
  • the invention can further be embodied in an assembly comprising the voltage monitoring device as described above, a slave device controlled by the monitoring device and a rail on which the voltage monitoring device and the slave device are adapted to be mounted in a side-by-side relationship in which the projecting portion engages the slave device.
  • Fig. 1 schematically illustrates an embodiment of an undervoltage release device.
  • the device has a plastics casing 1, one sidewall of which is removed in Fig. 1 in order to show mechanical and electromechanical components inside casing 1.
  • One of these is an electromagnet 2.
  • the electromagnet 2 comprises a core 3 made from ferromagnetic material, extending along an axis 4, and a solenoid 5 extending around core 3 and along axis 4.
  • An L-shaped yoke 6 has a first branch, a distal end of which is fixed to a first pole face of the core 3 and a second branch that extends along the core 3 so that a second end of the yoke 6 is substantially aligned with the second pole face of the core 3.
  • a first displaceable member 7 is pivotably linked to the second end of the yoke 6.
  • the first displaceable member 7 is at least in part made of ferromagnetic material; preferably it is integrally made of ferromagnetic material.
  • a second displaceable member 8 is mounted displaceably in a direction parallel to axis 4.
  • the second displaceable member 8 can be injection molded from plastics.
  • a rail that defines the direction of displacement and the stroke of member 8 is formed by a slot 9 of member 8, extending in parallel to axis 4, which is engaged by a web or by two spaced-apart pins 10 of casing 1.
  • Slot 9 opens into an elongate cavity 11 formed inside an elongate main body of member 8.
  • a helicoidal spring 12 is compressed between one of pins 10 and an end face of cavity 11, thus urging member 8 against a distal end of member 7, and urging member 7 against an abutment 13 formed in casing 1, thus defining a first stable position of members 7 and 8 in which member 7 is spaced apart from the second pole face of core 3.
  • a third displaceable member 14 comprises a shaft 15 which extends in along an axis 16 perpendicular to the plane of Fig. 1 and is pivotably mounted by being received in circular holes 17 of parallel sidewalls 17 of casing 1.
  • the hole 18 of the only sidewall 17 shown is represented as a dashed line because it is hidden beneath an arm 19 of member 14 that extends from shaft 15 in a radial direction.
  • Shaft 15 is biased counterclockwise by a second spring, not shown.
  • an edge 20 is formed, which, by the biasing action of the second spring, is pressed against a pin 21 of member 8 extending in parallel to axis 16.
  • a dotted line 25 illustrates the displacement of pin 21 between the first and second stable position.
  • a radius 26 extending from axis 16 intersects line 25 at right angles.
  • a switch 22 is coupled to member 8, for example by an arm 23 of member 8 operating a lever 24 of switch 22 whenever member 8 is displaced.
  • member 7 When an electrical current flows through solenoid 5, member 7 is magnetically attracted to the second end face of core 3. When the current exceeds a predetermined threshold, the magnetic attraction is sufficient to compress the spring 12, so that a second stable position is reached in which member 7 abuts against core 3, as shown in dashed lines in Fig. 1 .
  • member 7 may be made entirely of a ferromagnetic material. Alternatively, it may comprise a ferromagnetic body and a layer of non-magnetic material provided on a side of the ferromagnetic body facing core 3.
  • member 7 is displaced between its first and second stable positions since in the second stable position, the magnetic attraction between member 7 and electromagnet 2 generated by a given current flowing in solenoid 5 is stronger than in the first, due to the reduced air gap.
  • the width of the air gap in the second stable position and, hence, the amount of hysteresis can be controlled.
  • member 7 pushes down member 8, compresses spring 12 and operates switch 22.
  • pivoting member 14 rotates counterclockwise, so that edge 20 keeps in touch with pin 21, and member 14 also assumes its second stable position, shown in dashed lines.
  • an external torque applied to the shaft 15 may compensate the torque of the second spring, so that when members 7 and 8 are in their respective second positions, member 14 can still pivot between its first and second positions.
  • Fig. 2 is a circuit diagram of the monitoring device of Fig. 1 according to a first embodiment. Between input connectors 27, resistors R1, R2 are mounted in series with solenoid 5. R1 is optional. A flywheel diode D can be provided in parallel to solenoid 5.
  • Switch 22 is a single pole single throw switch 22, a switch having one stationary contact pad 31 and one mobile pad 32 that can touch contact pad 31 or be spaced apart from it. Switch 22 is mounted in parallel to resistor R2.
  • the open state of switch 22 shown in Fig. 2 corresponds to the second stable position described above, in the first stable position, switch 22 is closed.
  • overall resistivity of the circuit of Fig. 2 is low, and a low input tension at input connectors 27 is sufficient to produce a magnetic field that will attract displaceable member 7 and cause it to move towards the second stable position.
  • switch 22 When the second stable position has been reached, switch 22 is open, and the overall resistivity of the circuit is increased by R2. Thereby, the current through solenoid is decreased, but since member 7 is in contact with the second end face, a much weaker current is sufficient for maintaining the second stable position than for reaching it. Since the time in which switch 22 is closed is only a tiny fraction of the total operating time of the device, solenoid 5 doesn't have to be rated to support the current flowing through the switch over a prolonged period of time. Therefore, a compact, economic solenoid can be used.
  • switch 22 is a single pole double throw switch, i.e. a switch having a second stationary contact pad 33, stable positions of the mobile pad 32 being in contact with either pad 31 or 33.
  • the switch 22 allows a current to flow through solenoid 5 either by resistor R1 or R3.
  • R1 is optional, i.e. its resistivity may be zero.
  • R3 has a higher resistivity than R1.
  • pads 31, 32 of switch 22 are in contact, a large current can flow through solenoid 5, generating a magnetic attraction strong enough to set displaceable member 7 in motion from the first stable position towards the second.
  • the resistivity of R3 is chosen so as to keep member 7 in motion towards the second stable position and to hold it there.
  • Fig.4 is a perspective view of the undervoltage release device of Fig.1 , and of a slave device controlled by it.
  • Casings 1, 28 of the two devices are substantially identical in outline and have connectors, not shown, for mounting on a rail 29 in an orientation in which sidewalls 17 of the two casings extend normally with respect to a longitudinal direction of the rail 29, and in which facing sidewalls 17 of the two casings 1, 28 touch each other.
  • the rail 29 can e.g. be a top hat rail according to IEC/EN 60715.
  • a portion of shaft 15 protrudes beyond the sidewall 17 of casing 1.
  • the facing sidewall, not shown, of casing 28 has an opening designed to receive the projecting portion of shaft 15.
  • a circuit breaker inside casing 28 is operable by a rotation of shaft 15 engaging casing 28, so as to cut off power to a consumer, not shown, when the input voltage Vcc drops below the first threshold, and arm 19 is forced into its first stable position.
  • member 14 can do so, too, but might also be withheld by torque applied to shaft 15 by the circuit breaker. I.e. while the circuit breaker will always be open when the linkage formed by members 7, 8, 14 is in the first position, it can be controlled to be open or closed, e.g. by means of a control knob 34, when the linkage is in the second position.
  • shaft 15 is mounted in casing 1 so as to be displaceable along axis 16, and its length is somewhat less than twice the thickness of the casing 1, so that it can protrude from one sidewall 17 of casing 1 as shown in Fig. 4 while being flush with the other.
  • the casing 28 has a second opening 30 in the sidewall 17 facing away from casing 1. Both openings 30 of casing 28 are aligned with axis 16.
  • the shaft 15 can engage casing 28 from either side, and the voltage monitoring device of casing 1 can control a slave device mounted on either side of it.
EP20154631.4A 2020-01-30 2020-01-30 Dispositif de surveillance de tension Active EP3859763B1 (fr)

Priority Applications (2)

Application Number Priority Date Filing Date Title
EP20154631.4A EP3859763B1 (fr) 2020-01-30 2020-01-30 Dispositif de surveillance de tension
CN202110124981.0A CN113205981A (zh) 2020-01-30 2021-01-29 电压测量装置

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP20154631.4A EP3859763B1 (fr) 2020-01-30 2020-01-30 Dispositif de surveillance de tension

Publications (2)

Publication Number Publication Date
EP3859763A1 true EP3859763A1 (fr) 2021-08-04
EP3859763B1 EP3859763B1 (fr) 2022-09-21

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ID=69411338

Family Applications (1)

Application Number Title Priority Date Filing Date
EP20154631.4A Active EP3859763B1 (fr) 2020-01-30 2020-01-30 Dispositif de surveillance de tension

Country Status (2)

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EP (1) EP3859763B1 (fr)
CN (1) CN113205981A (fr)

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4183071A (en) * 1978-06-05 1980-01-08 General Electric Company Control circuit for resetting circuit breaker UVR solenoid
US4370635A (en) * 1980-09-29 1983-01-25 Siemens-Allis, Inc. Undervoltage release device for a circuit breaker
US6233129B1 (en) * 1995-02-24 2001-05-15 Siemens Aktiengesellschaft Undervoltage circuit breaker with an electromagnet
EP1122758A2 (fr) * 2000-02-03 2001-08-08 Heinrich Kopp AG Déclencheur auxiliaire pour disjoncteur de puissance, de fuite à la terre et de protection de moteur
DE20110741U1 (de) 2001-06-28 2001-09-06 Siemens Ag Ansteuerschaltung für ein Gleichstrom-Magnetsystem
US20050162246A1 (en) * 2004-01-26 2005-07-28 Tzo-Ing Lin Noise-free low-power consumption wide voltage range DC and AC contactor and remote telephone control system using the same

Family Cites Families (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4025823A (en) * 1975-07-11 1977-05-24 Westinghouse Electric Corporation Circuit breaker including undervoltage release mechanism and control circuit
DE19735413B4 (de) * 1997-08-14 2007-11-29 Siemens Ag Auslösevorrichtung für einen Schutzschalter
KR101082175B1 (ko) * 2010-01-27 2011-11-09 엘에스산전 주식회사 트립 알람수단을 가진 회로차단기
CN203192723U (zh) * 2013-03-27 2013-09-11 江苏大全高压开关有限公司 断路器用欠压脱扣装置
CN105575737B (zh) * 2016-03-15 2017-10-20 佳一电气有限公司 一种断路器操作机构及断路器
CN106451346A (zh) * 2016-09-29 2017-02-22 益盐堂（应城）健康盐制盐有限公司 一种具有延时动作功能的欠压自动保护断路器
CN206961768U (zh) * 2017-05-19 2018-02-02 德力西电气有限公司 断路器的附件

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4183071A (en) * 1978-06-05 1980-01-08 General Electric Company Control circuit for resetting circuit breaker UVR solenoid
US4370635A (en) * 1980-09-29 1983-01-25 Siemens-Allis, Inc. Undervoltage release device for a circuit breaker
US6233129B1 (en) * 1995-02-24 2001-05-15 Siemens Aktiengesellschaft Undervoltage circuit breaker with an electromagnet
EP1122758A2 (fr) * 2000-02-03 2001-08-08 Heinrich Kopp AG Déclencheur auxiliaire pour disjoncteur de puissance, de fuite à la terre et de protection de moteur
DE20110741U1 (de) 2001-06-28 2001-09-06 Siemens Ag Ansteuerschaltung für ein Gleichstrom-Magnetsystem
US20050162246A1 (en) * 2004-01-26 2005-07-28 Tzo-Ing Lin Noise-free low-power consumption wide voltage range DC and AC contactor and remote telephone control system using the same

Also Published As

Publication number Publication date
CN113205981A (zh) 2021-08-03
EP3859763B1 (fr) 2022-09-21

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