EP2028678B1 - Circuit breaker with temperature sensor - Google Patents

Circuit breaker with temperature sensor Download PDF

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Publication number
EP2028678B1
EP2028678B1 EP20080162489 EP08162489A EP2028678B1 EP 2028678 B1 EP2028678 B1 EP 2028678B1 EP 20080162489 EP20080162489 EP 20080162489 EP 08162489 A EP08162489 A EP 08162489A EP 2028678 B1 EP2028678 B1 EP 2028678B1
Authority
EP
European Patent Office
Prior art keywords
temperature
unit
temperature sensor
breaker
display
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.)
Active
Application number
EP20080162489
Other languages
German (de)
English (en)
French (fr)
Other versions
EP2028678A1 (en
Inventor
Seung Pil Yang
Kil Young Ahn
Jae Pil LS Industrial Systems Co. Ltd. Eom
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.)
LS Electric Co Ltd
Original Assignee
LS Industrial 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
Priority claimed from KR1020070083516A external-priority patent/KR100883042B1/ko
Priority claimed from KR1020070083598A external-priority patent/KR100883043B1/ko
Application filed by LS Industrial Systems Co Ltd filed Critical LS Industrial Systems Co Ltd
Publication of EP2028678A1 publication Critical patent/EP2028678A1/en
Application granted granted Critical
Publication of EP2028678B1 publication Critical patent/EP2028678B1/en
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
    • H01H71/04—Means for indicating condition of the switching device
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H11/00—Apparatus or processes specially adapted for the manufacture of electric switches
    • H01H11/0062—Testing or measuring non-electrical properties of switches, e.g. contact velocity
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H11/00—Apparatus or processes specially adapted for the manufacture of electric switches
    • H01H11/0062—Testing or measuring non-electrical properties of switches, e.g. contact velocity
    • H01H2011/0068—Testing or measuring non-electrical properties of switches, e.g. contact velocity measuring the temperature of the switch or parts thereof
    • 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

Definitions

  • the following description relates generally to an air circuit breaker having a temperature sensor capable of sensing the temperature of an air circuit breaker by connecting a movable contactor and a stationary contactor to thereby prevent damage to the air circuit breaker caused by abnormal heating of a conduction unit comprising a current conduction circuit.
  • a circuit breaker is an electric protecting apparatus installed between an electric source and load units in order to protect the load units such as a motor and a transformer and an electric line from an abnormal current (a large current caused by i.e., short circuit and a ground fault) generated at an electric circuit such as a power transmission/distribution line and private power transforming facilities.
  • the circuit breaker insulated by insulation at a breaker may manually open or close an electric line under normal use state, and open or close the line from a remote distance using an electric manipulation unit outside a metal container and automatically break the line during over-current and short-circuit to protect the power facilities and load units.
  • the air circuit breaker operates in such a manner that a stationary contactor and a movable contactor which is movable to a closing position at which the movable contactor contacts the stationary contactor to close the circuit and to a breaking (trip) position at which the movable contactor is separated from the stationary contactor to open the circuit.
  • the circuit breaker may be classified into an air circuit breaker, a hydraulic circuit breaker and a spring circuit breaker according to manipulation method.
  • the circuit breaker may be also classified into an air circuit breaker (ACB) for distinguishing are by blowing air, and a gas circuit breaker (GCB) for distinguishing are by blowing gas according to extinguishing medium of arc generated in the course of separating the movable contactor from the stationary contactor by manipulation of the breaker.
  • AVB air circuit breaker
  • GCB gas circuit breaker
  • FIG. 1 is a perspective view illustrating a schematic construction of a conventional air circuit breaker and FIG.2 is a side view illustrating a schematic inner construction of the air circuit breaker.
  • the typical air circuit breakers may largely include a conduction unit (40) constituting a conduction circuit by connecting a movable contact point of a movable contactor (42) and a stationary contact point of a stationary contactor (44), a base mold (10) provided with the conduction unit (40) therein, a detection unit (20) detecting an accident current and an open/close mechanism (30) operating the movable contactor (42) in response to a detection signal of the detection unit (20).
  • the air circuit breaker is mounted with a conduction unit (40) for each phase, i.e., an R phase (13) conduction unit, an S phase (14) conduction unit and a T phase (15) conduction unit, as shown in FIG.1 .
  • the stationary contactor (44) of the conduction unit (41) is connected to an upper terminal (46) through which current is introduced into the breaker, and the current introduced into the upper terminal (46) flows to a lower terminal (47) via the movable contactor (42).
  • the conduction circuit of the air circuit breaker is closed, the current flows to the conduction unit (40) to increase the temperature of the air circuit breaker due to generated heat of conductors including the contact points.
  • One of the methods for monitoring the temperature of the conduction unit at the air circuit breaker is to measure the temperature by intermittently photographing an upper terminal and a lower terminal using an infrared thermal imaging camera from outside of the air circuit breaker.
  • this method suffers from a disadvantage that it is difficult to measure an inner temperature of the air circuit breaker although an external temperature is measurable.
  • An installation of a temperature sensor for checking the temperature of the conduction unit of the air circuit breaker may be considered a possible solution but it is not that easy to install a temperature sensor at the upper terminal and the lower terminal where the current flows, such that there has existed no air circuit breaker mounted with a temperature sensor capable of sensing an abnormal heating in real time.
  • EP-A1-1 107 274 discloses a circuit breaker with a current-supply information measuring unit including contact jigs for temperature detection, and the detected temperature is displayed by a display .
  • the present invention has been disclosed to solve the aforementioned disadvantages and it is an object of the present invention to provide an air circuit breaker having a temperature sensor capable of monitoring the temperature of the air circuit breaker at all times, thereby preventing damage of the air circuit breaker caused by an abnormal heating of a conduction unit constituting a conduction circuit in which a movable contactor and a stationary contactor are connected.
  • an air circuit breaker as defined in the appended claim 1 is provided by the present invention.
  • the temperature sensor may be electrically connected to the temperature display via an external connector.
  • the air circuit breaker may further include a resilient member connected to the temperature sensor, such that the temperature sensor is fixedly inserted into a sensor insertion hole.
  • the temperature display may include an input terminal electrically connected to the temperature sensor, a compensation unit respectively compensating the temperature of the movable contactor of the conduction unit, the temperature of the upper terminal connected to the stationary contactor of the conduction unit and the temperature of the lower terminal connected to the movable contactor based on the value detected by the temperature sensor, and a display indicating the respective compensated temperatures.
  • the temperature display may further include an output terminal for outputting to an outside the value detected by the temperature sensor and the compensated temperatures.
  • the air circuit breaker may further include a warning device for warning to the outside that the value detected by the temperature sensor has surpassed a predetermined reference temperature, if the value detected by the temperature sensor surpasses a predetermined reference temperature
  • the warning device may include a temperature set-up unit for setting up the reference temperature, an over-heat detection unit determining whether the value detected by the temperature sensor has surpassed the reference temperature set up by the temperature set-up unit, and an over-heat notifying unit for notifying that the value detected by the temperature senor has surpassed the reference temperature as a result of the determination by the over-heat detection unit that the value detected by the temperature senor has surpassed the reference temperature.
  • the temperature set-up unit is a DIP (Dual Inline Package) switch capable of selecting a desired reference temperature level out of reference temperature levels classified into various steps.
  • DIP Digital Inline Package
  • the over-heat detection unit may include an Analog-to-Digital Converter (ADC) converting the value detected by the temperature sensor to a digital value
  • the over-heat notifying unit may include a digital display indicating the temperature converted to the digital value by the ADC.
  • ADC Analog-to-Digital Converter
  • the over-heat detection unit may generate a control signal in response to the temperature converted to the digital value by the ADC, and the digital display may include a plurality of LEDs (Light Emitting Devices) to display the temperature by turning on and off the plurality of LEDs in response to the control signal generated by the over-heat detection unit.
  • LEDs Light Emitting Devices
  • the plurality of LEDs may include an LED-based 7-segment display group where respective segments are turned on and off to display the digital numbers in response to the control signal from the over-heat detection unit.
  • the air circuit breaker having a temperature sensor may enable to monitor the temperature of the air circuit breaker at all times via the temperature sensor and temperature display, thereby preventing damage thereto caused by an abnormal heating of a conduction unit constituting a conduction circuit and avoiding an accidental current caused by an erroneous operation of the air circuit breaker.
  • the warning device may immediately notify to a user a failure where the temperature detected by the temperature sensor has surpassed the reference temperature to thereby allow the user to address the accidental situation.
  • the user may be allowed to set up the reference temperature based on the current temperature in response to the load and to accurately check the state of the air circuit breaker at all times.
  • the air circuit breaker may protect power systems from overload caused by over-current exceeding a critical value, protect the user from the hazard of fire caused by over-heating inside the air circuit breaker, and prolong the life of the air circuit breaker by using the breaker on a stable basis.
  • FIG. 3 is a perspective view illustrating a schematic configuration of an air circuit breaker having a temperature sensor according to an exemplary implementation
  • FIG.4 is a schematic configuration of a temperature sensor according to an exemplary implementation
  • FIG.5 is a perspective view illustrating a state of the temperature sensor being coupled to a resilient member according to an exemplary implementation
  • FIG.6 is a perspective view illustrating a front base mold formed with a sensor insertion hole for mounting a temperature sensor to the air circuit breaker according to an exemplary implementation
  • FIG. 3 is a perspective view illustrating a schematic configuration of an air circuit breaker having a temperature sensor according to an exemplary implementation
  • FIG.4 is a schematic configuration of a temperature sensor according to an exemplary implementation
  • FIG.5 is a perspective view illustrating a state of the temperature sensor being coupled to a resilient member according to an exemplary implementation
  • FIG.6 is a perspective view illustrating a front base mold formed with a sensor insertion hole for mounting a temperature sensor to the air circuit breaker according to an
  • FIG. 7 is a perspective view illustrating a rear base mold coupled to the front base mold in FIG.5
  • FIG.8 is a side view schematically illustrating an air circuit breaker having a temperature sensor according to an exemplary implementation
  • FIG.9 is a plan view illustrating a temperature display according to an exemplary implementation
  • FIG. 10 is a schematic block diagram illustrating configuration of a warning device according to an exemplary implementation
  • FIG.11 is a plan view illustrating a temperature setting unit according to an exemplary implementation.
  • a base mold (110) may include a front base mold (112) and a rear base mold (117) and be provided therein with a conduction unit (140).
  • FIG. 6 refers to the front base mold (112) and FIG. 7 refers to the rear base mold (117).
  • the base mold (110) is so formed as to have an inner space at places where each phase (R, S, T phase) is situated.
  • the base mold (110) may be made of insulation material such as plastic and the like.
  • Each phase (R phase, S phase, T phase) of 3-phase alternating current breaker is provided with the conduction unit (140) as shown in FIG.3 .
  • the conduction unit (140) may include a movable contactor (142) having a movable contact point and a stationary contactor (144) having a stationary contact point as shown in FIG.8 .
  • the stationary contactor (144) may be connected to an upper terminal (146) into which current is introduced, and the movable contactor (142) may be connected to a lower terminal (147) to constitute a conduction circuit.
  • a detection unit (120) may be provided at a front surface of the base mold (110) to detect an accidental current such as over-current or short-circuited current.
  • An open/close mechanism (130) is provided at a front surface of the base mold (110) to operate the movable contactor (142) of the conduction unit in response to a detection signal from the detection unit (120).
  • a temperature sensor (150) may include a sensor unit (152) for measuring temperatures, an electric lead line (154) extended from the sensor unit (152), and a connector (156) connected to the lead line (154) for access to a temperature display (160), as illustrated in FIG.4 .
  • a connector (160) of the temperature sensor (150) is preferably connected to a connection terminal (172) of an external connector (170) as the air circuit breaker is typically mounted with the external connector (170) as shown in FIG.8 .
  • the external connector (170) is connected to an input terminal (162) of the temperature display (160) to allow the temperature sensor (150) and the temperature display (160) to be electrically connected.
  • the temperature sensor (150) may be disposed inside the air circuit breaker for measuring temperature of the conduction unit (140). As it is difficult to directly measure the temperature of the conduction unit (140), a temperature nearby may be measured for consideration as the temperature of the conduction unit (140). To this end, an experimental data may be obtained on relationship between the temperature of the conduction unit (140) and a temperature where the temperature sensor (150) is installed. As a result, the temperature where the temperature sensor (150) is located may be considered the temperature of the conduction unit (140) based on the experimental data.
  • the temperature sensor (150) in the three phase (R, S, T) air circuit breaker may be installed at a base mold between R phase and S phase, and at a base mold between S phase and T phase. This is because, as described above, an accurate temperature cannot be measured due to circulating air at the inner space if the temperature sensor (150) is disposed at the inner space as each base mold (110) has the inner space per phase.
  • two sensor insertion holes (115) insertable by the temperature sensor (150) may be formed at the first rib partition (113) of a front base mold formed between R phase and S phase, and at a second rib partition (114) of the front base mold formed between S phase and T phase, and the temperature sensor (150) may be inserted into the two holes.
  • the sensor insertion hole (115) may be formed deep enough to enable the measurement of temperature inside the breaker.
  • the sensor insertion hole (115) may be formed at an inlet side thereof with a guide groove (116) to prevent the electrical lines of the temperature sensor (150) from being interfered with other elements of the breaker.
  • the temperature sensor (150) may be formed in such a manner that a sensor unit (152) is inserted into a rubbery resilient member (158) to be partially exposed from the resilient member (158) as shown in FIG.5 .
  • the temperature sensor (150) coupled with the resilient member (158) may be fixedly inserted into the sensor insertion hole (115) as illustrated in FIGS.3 and 8 .
  • the temperature display (160) electrically connected to the temperature sensor (150) is a device for displaying measurement values by compensating the values by the temperature of the conduction unit (140), whereby a user can monitor the temperature inside the air circuit breaker in real time.
  • the temperature display (160) may include an input terminal (162) electrically connected to the temperature sensor (150), a compensator (not shown) compensating the value measured by the temperature sensor (150) by the temperature of the conduction unit, and a display unit (164) displaying the compensated temperature of the conduction unit.
  • the compensator may work in such a way as to consider the value measured by the temperature sensor (150) as the temperature of the conduction unit using the experimental data. At this time, preferably, the values measured by the temperature sensor (150) are respectively considered as the temperature of the movable contactor (142) at the conduction unit, the temperature of the upper terminal (146) and the temperature of the lower terminal and displayed on the display unit (164).
  • the temperature display (160) may further include an output terminal for outputting the measured temperatures to the outside, whereby the inner temperature of air circuit breaker can be monitored in real time from the site where the breaker is located and from a remote distance as well.
  • the air circuit breaker having a temperature sensor may further include a warning device (200) warning that the value detected by the temperature sensor (150) has surpassed a predetermined reference temperature if the value detected by the temperature sensor (150) is greater than the predetermined reference temperature.
  • the warning device (200) may comprise any structure, preferably in plural structure, for notifying the impending danger to users in real time, and notifying wirelessly to a user in a distant place.
  • the warning device (200) mounted along with the temperature display (160) may warn to the outside that the value detected by the temperature sensor (150) has surpassed a predetermined reference temperature if the value detected by the temperature sensor (150) is greater than the predetermined reference temperature, may visually warn the user by way of an LED lamp (167), and may audibly warn via a speaker.
  • the warning device (200) may include a temperature set-up unit (210), an over-heat detection unit (220) and an over-heat notifying unit (230), as illustrated in FIG.10 .
  • the temperature set-up unit (210) may be manipulated by a user and set up a reference temperature that is compared with the values detected by the temperature sensor (150).
  • the temperature set-up unit (210) may select (turn on) number 1 from a DIP (Dual Inline Package) switch where reference temperature level is classified from number 1 to number 4 per step , and set up the reference temperature by turning off the other numbers, as illustrated in FIG.11 .
  • the temperature set-up unit may select a desired reference temperature level out of reference temperature levels classified into various steps using the DIP switch.
  • the over-heat detection unit (220) may determine whether the value detected by the temperature sensor (150) has surpassed the reference temperature set up by the temperature set-up unit (210).
  • the over-heat detection unit (220) may further include an ADC (Analog-to-Digital Converter. 225) that converts an analog temperature value detected by the temperature sensor (150) to a digital value. Successively, the over-heat detection unit (220) may determine whether the temperature digitally converted by the ADC (225) has surpassed the reference temperature set up by the temperature set-up unit (210).
  • ADC Analog-to-Digital Converter. 225
  • the over-heat detection unit (220) may generate a control signal in response to the temperature digitally converted by the ADC (225).
  • the control signal may function as a signal for controlling a digital display (described later. 235), where the digital display (235) displays the temperature in response to the control signal.
  • the over-heat notifying unit (230) may notify the fact to the outside.
  • the over-heat notifying unit (230) may include a warning sound generator (not shown) generating a warning sound, or a light on-off unit (not shown) turning on or off a light to notify to the user that the air circuit breaker has been over-heated by the temperature inside the breaker having surpassed the set-up reference temperature.
  • the over-heat notifying unit (230) may further include a digital display (235), and the digital display (235) may display the digitally-converted temperature by the ADC (225) of the over-heat detection unit (220) to allow the user to be informed of the temperature inside the air circuit breaker.
  • the digital display (235) may display the temperature using a single color LED, a tri-color LED or an LED-based 7-segment display group.
  • the digital display (235) mounted with the single color LED, the tri-color LED or the LED-based 7-segment display group will be described in detail.
  • the digital display (235) may be mounted with a plurality of single color LEDs (red, green, blue included) and turn on or off a plurality of predetermined LEDs out of the plurality of single color LEDs in response to the control signal generated by the over-heat detection unit (220), or turn on or off the predetermined color LEDs (red, green or blue) for display of the temperature.
  • the digital display (235) may be disposed with a tri-color LED and turn on or off a predetermined color LED out of the tri-color LED in response to the control signal generated by the over-heat detection unit (220) for display of the temperature.
  • the turning on or off of the predetermined color using the single color LED or the tri-color LED in the above description is applicable to a case where colors are pre-defined by classifying the temperatures per step.
  • the digital display (235) may be disposed with at least one or more LED-based 7-segment displays, and turn on or off a relevant segment of the LED-based 7-segment displays according to the control signal generated by the over-heat detection unit (220) for displaying the temperatures in digital numbers.
  • the digital display (235) may serve to notify the user the accurate state inside the air circuit breaker, even if the warning sound generator or light on-off unit of the over-heat notifying unit (230) fails to function properly.
  • the digital display (235) may notify the user a current temperature inside the air circuit breaker to allow the user to set up a reference temperature based on a temperature commensurate to a current load volume, if the user sets up the reference temperature inside the air circuit breaker via the temperature set-up unit (210).
  • the warning device (200) thus configured and mounted on the air circuit breaker can break the power supply to load systems when an over-current exceeding a critical value is generated inside the air circuit breaker, and monitor the temperature inside the breaker at all times to protect the user against the dangerous fire, thereby allowing the user to use the breaker stably for a long time.

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  • Distribution Board (AREA)
  • Thermally Actuated Switches (AREA)
EP20080162489 2007-08-20 2008-08-18 Circuit breaker with temperature sensor Active EP2028678B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
KR1020070083516A KR100883042B1 (ko) 2007-08-20 2007-08-20 온도센서를 구비한 기중차단기
KR1020070083598A KR100883043B1 (ko) 2007-08-20 2007-08-20 차단기의 과열 알림 장치

Publications (2)

Publication Number Publication Date
EP2028678A1 EP2028678A1 (en) 2009-02-25
EP2028678B1 true EP2028678B1 (en) 2013-11-06

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ID=39874109

Family Applications (1)

Application Number Title Priority Date Filing Date
EP20080162489 Active EP2028678B1 (en) 2007-08-20 2008-08-18 Circuit breaker with temperature sensor

Country Status (4)

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EP (1) EP2028678B1 (es)
ES (1) ES2443530T3 (es)
MY (1) MY158119A (es)
RU (1) RU2414765C2 (es)

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2015084387A1 (en) 2013-12-06 2015-06-11 Schneider Electric USA, Inc. Temperature sensor for bolted connections
KR101853859B1 (ko) 2016-12-02 2018-06-08 엘에스산전 주식회사 배선용 차단기의 터미널 구조
KR101912698B1 (ko) * 2017-02-21 2018-10-29 엘에스산전 주식회사 조작기를 갖는 차단기
KR101912699B1 (ko) 2017-07-27 2018-12-28 엘에스산전 주식회사 직류 기중차단기

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH05234493A (ja) * 1992-02-20 1993-09-10 Fuji Electric Co Ltd 回路遮断器の異常温度警報装置
US6231227B1 (en) * 1998-12-28 2001-05-15 General Electric Company Method of determining contact wear in a trip unit
WO2000079554A1 (fr) 1999-06-22 2000-12-28 Mitsubishi Denki Kabushiki Kaisha Disjoncteur a dispositif de mesure informant sur l'etat sous tension
US6466424B1 (en) * 1999-12-29 2002-10-15 General Electric Company Circuit protective device with temperature sensing
DE102005046925A1 (de) * 2005-09-30 2007-04-19 Siemens Ag Schaltgerät zum Schalten mindestens eines Stromes

Also Published As

Publication number Publication date
EP2028678A1 (en) 2009-02-25
MY158119A (en) 2016-08-30
RU2008133879A (ru) 2010-02-27
ES2443530T3 (es) 2014-02-19
RU2414765C2 (ru) 2011-03-20

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