WO2004088812A1 - Dispositif de protection pour equipement electrique triphase - Google Patents

Dispositif de protection pour equipement electrique triphase Download PDF

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Publication number
WO2004088812A1
WO2004088812A1 PCT/ZA2004/000040 ZA2004000040W WO2004088812A1 WO 2004088812 A1 WO2004088812 A1 WO 2004088812A1 ZA 2004000040 W ZA2004000040 W ZA 2004000040W WO 2004088812 A1 WO2004088812 A1 WO 2004088812A1
Authority
WO
WIPO (PCT)
Prior art keywords
phase
output
protection device
voltage
power supply
Prior art date
Application number
PCT/ZA2004/000040
Other languages
English (en)
Inventor
Theodore Strauss
Original Assignee
Theodore Strauss
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 Theodore Strauss filed Critical Theodore Strauss
Publication of WO2004088812A1 publication Critical patent/WO2004088812A1/fr

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Classifications

    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
    • H02H11/00—Emergency protective circuit arrangements for preventing the switching-on in case an undesired electric working condition might result
    • H02H11/004—Emergency protective circuit arrangements for preventing the switching-on in case an undesired electric working condition might result in case of incorrect phase sequence; with switching for obtaining correct phase sequence
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
    • H02H3/00—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection
    • H02H3/24—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection responsive to undervoltage or no-voltage
    • H02H3/253—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection responsive to undervoltage or no-voltage for multiphase applications, e.g. phase interruption
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
    • H02H7/00—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions
    • H02H7/08—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions for dynamo-electric motors
    • H02H7/09—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions for dynamo-electric motors against over-voltage; against reduction of voltage; against phase interruption

Definitions

  • This invention relates to a protection device for electrical three-phase equipment and, more particularly, to a protection device that is adapted to avoid, or at least diminish, the possibility of consequential damage to equipment operated by three-phase electrical power supplies following an occurrence of one or more of the phases of the three-phase electrical power supply deviating outside particular parameters.
  • a protection device for three-phase electrical equipment characterised in that it comprises a voltage sensor for each phase, a phase sensor for each phase, control circuitry operated by an output from the voltage and phase sensors and itself having a control output adapted to operate switching means in the electrical power supply to an item of three-phase electrical equipment in the event that one or more voltages of the power supply deviates outside predetermined safe parameters or in the event that a phase becomes swapped, or both.
  • each voltage sensor to have an output that is fed to a voltage balance monitor, typically in the form of a d.c. sample voltage; for each phas sensor to have an output that is fed to a phase comparator, typically in the form of a square wave pulse; for the outputs from the voltage balance monitor and phase comparator to be inputted to a relay control logic circuit the output of which is operatively connected to a relay typically controlling a three-phase circuit contactor that together constitute said switching means; and for the device to have condition indicator lights indicating the condition of the switching means.
  • a still further feature of the invention provides for the control circuitry, and in particular the relay control logic circuit, to have a second output operatively controlling a second switch relay for operating a second three-phase circuit contactor operatively connected into a three-phase power supply to an item of three-phase electrical equipment in a manner adapted to correct a swapped phase.
  • the device provided by this invention may be constructed as a stand-alone device for inclusion in an existing installation or, alternatively, it may be built into an item of three-phase electrical equipment.
  • the invention therefore also provides an item of three-phase electrical equipment embodying a device according to the invention.
  • the accompanying drawing is a circuit diagram of a device according to the invention connected into a three-phase power supply to an item of three- phase electrical equipment.
  • a three-phase mains power supply is indicated by numeral (1) and has the usual three phase inputs L1, L2, L3, and a neutral N in instances in which a neutral is employed.
  • a neutral may be employed in a five wire system but would not be employed in a four wire system, in each case in an earth wire E being present and forming the additional wire.
  • the three-phase power supply is connected to the electrical equipment that is indicated by numeral (2) by way of a first contactor (3) that is to isolate the electrical equipment by opening all the phases simultaneously and, where applicable, also the neutral.
  • a second contactor (4) is connected in parallel with the first contactor except that, on the output side, two of the phases, in this case L2 and L3, are reversed in order to correct a swapped phase.
  • the contactors (3) and (4) are operated by relay switches (5) and (6) respectively in a manner so that both of the contactors cannot be closed at the same time although they can both be open at the same time.
  • the relay switches are controlled by a relay control logic circuit (7) in the manner that will be discussed further below.
  • the voltage of each of the phases is sampled by a voltage sampler (8a, 8b, and 8c) that isolates and converts the incoming AC voltage on the relevant phase to a safe and usable level for measurement.
  • a voltage sampler 8a, 8b, and 8c
  • a step-down transformer and bridge rectifier isolates and converts the AC input voltage to DC, where-after a resistor divider network provides a sample voltage output that is fed to a voltage balance monitor (9).
  • the voltage balance monitor receives the sample voltages from the voltage samplers and checks that all are present and of the correct level (i.e. balanced within predetermined parameters). If all of the phase voltages are present and of the correct level, the voltage/balance monitor circuitry outputs a "pass" condition that is fed to the relay control logic circuit (7). If one or more of the phase voltages are absent or of an incorrect level (out of balance), the circuitry outputs a "fault" condition.
  • operational-amplifiers configured as a window comparator, measure each of the supplied sample voltages, and, if the sample voltage falls between a set upper and lower limit (voltage window determined by a resistor voltage divider network), the comparator outputs a logic "1".
  • phase sampler (10a, 10b, 10c) that isolates and converts the incoming AC voltage on the relevant phase to square wave pulses.
  • An opto-isolator connected between the secondary winding of the associated transformer, converts the sinusoidal input voltage to square wave pulses, which are then buffered by a NAND gate.
  • phase comparator (11) receives the square wave pulses from each of the phase samplers and compares them to each other to determine whether each is in the correct phase sequence. If the phases are in the correct sequence, the phase comparator outputs a "pass" condition.
  • phase comparator If the phases are not in the correct sequence, the phase comparator outputs a "fault" condition.
  • Each of the square wave pulse trains are 120° out of phase, ie, phase 2 is 120° behind phase 1, phase 3 is 120° behind phase 2, and phase 1 is in turn 120° behind phase 3.
  • phase 1 is clocked into a 'D' type latch, by phase 2. If the correct phase lag exists, the output of the 'D' latch is a logic "1".
  • Phase 2 is clocked into a 'D' type latch, by phase 3. If the correct phase lag exists, the output of this 'D' latch is also a logic "1”.
  • Both of the 'D' latch outputs are passed to an AND gate. The output of the AND gate is only a logic “1” if the outputs from the 'D'latches are both "1".
  • the clock and data inputs from one of the latches will be out of synchrony, and the output of that latch will be a logic "0" causing a logic "0" at the output of the AND gate.
  • the output from the AND gate is fed to the relay control logic circuit (7).
  • the relay control logic circuit continuously monitors the outputs from the voltage balance monitor and the phase comparator. If the output from the voltage/phase monitor is in a "fail” condition, then the relay control logic circuit de-energizes (switches off) both of the relay switches (5) and (6) which in turn de-energizes both contactors (3) and (4) thus isolating power from the electrical equipment.
  • the first relay switch (5) is energized, which in turn energizes the first contactor (3) to connect the three phase electrical supply to the electrical equipment with the phases arranged as supplied by the electrical mains power supply.
  • the relay control logic circuit employs an array of AND gates that are used to translate the "1" or "0" output from the voltage balance monitor and the phase comparator. 1
  • the AND function switches off the first relay switch (5), which removes the control voltage to the first contactor (3).
  • the second contactor (4) swaps two of the incoming phases, thus re-creating the correct phase sequence that i& then connected thrd ⁇ fcjri to the output.
  • the device is further provided with indicator lights (12) that are energized by the relay control logic circuitry to provide a visual indication of the current condition of the power supply.
  • auxiliary switc e ⁇ *(13J hd (14) can be energize 1 d for activating other facilities such as an alarm, .lights, siren, or other monitoring or surveillance devices according to user requirements. It will be understood that numerous variations may be made to the embodiment of the invention described above without departing from the scope hereof. In particular, the exact nature of the various circuit components can be varied widely according to requirements and available technology and components.
  • the device can be made as a stand-alone unit to be installed between an electrical mains power supply and three phase electrical equipment or, it may be built into the equipment or, for that matter, built into an electrical power supply reticulation system, typically within a factory or the like.

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  • Control Of Electrical Variables (AREA)

Abstract

L'invention concerne un dispositif de protection pour équipement électrique triphasé qui comprend un détecteur de tension (8a, 8b, 8c) pour chaque phase ; un détecteur de phase (10a, 10b, 10c) pour chaque phase; et des circuits de commandes (7) répondant à la sortie de ces détecteurs, puis donnant une sortie de contrôle pour le fonctionnement d'un système de commutation (3, 5,) dans le système d'alimentation (1) d'un équipement électrique triphasé (2) pour le cas où une ou plusieurs tensions de l'alimentation dévieraient de paramètres externes sûrs préétablis ou bien pour le cas où une phase serait commutée ou les deux. De préférence, une seconde sortie de contrôle commande un second relais de commutation (6) pour le fonctionnement d'un second contacteur de circuit triphasé (4) relié opérationnel dans une alimentation triphasée à un équipement électrique triphasé, selon des modalités adaptées à la correction d'une phase commutée.
PCT/ZA2004/000040 2003-04-04 2004-04-05 Dispositif de protection pour equipement electrique triphase WO2004088812A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
ZA03/2831 2003-04-04
ZA200302831 2003-04-04

Publications (1)

Publication Number Publication Date
WO2004088812A1 true WO2004088812A1 (fr) 2004-10-14

Family

ID=33132347

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/ZA2004/000040 WO2004088812A1 (fr) 2003-04-04 2004-04-05 Dispositif de protection pour equipement electrique triphase

Country Status (1)

Country Link
WO (1) WO2004088812A1 (fr)

Cited By (13)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN101895095A (zh) * 2010-06-29 2010-11-24 河南省电力公司许昌供电公司 电动机缺相显示保护装置
CN102664387A (zh) * 2012-05-16 2012-09-12 天水二一三电器有限公司 三相异步电动机相序保护器与保护方法
CN103117542A (zh) * 2013-02-01 2013-05-22 四川省电力公司内江电业局 风机相序保护电路
CN103746334A (zh) * 2014-02-18 2014-04-23 常州江南电力环境工程有限公司 加热器电子保护装置
WO2014209503A1 (fr) * 2013-06-28 2014-12-31 Illinois Tool Works Inc. Extracteur de composants atmosphériques portables triphasé à commande de direction rotatoire
US9468958B2 (en) 2012-03-16 2016-10-18 Illinois Tool Works Inc. Airborne component extractor with adjustable flow rates
US9623506B2 (en) 2011-02-01 2017-04-18 Illinois Tool Works Inc. Fume extractor for welding applications
US9821351B2 (en) 2011-11-11 2017-11-21 Illinois Tool Works Inc. Welding fume extractor
US9839948B2 (en) 2013-01-29 2017-12-12 Illinois Tool Works Inc. Fume evacuation system
US10242317B2 (en) 2014-11-25 2019-03-26 Illinois Tool Works Inc. System for estimating the amount and content of fumes
US10808953B2 (en) 2013-06-28 2020-10-20 Illinois Tool Works Inc. Airborne component extractor with baffled debris collection
US11014132B2 (en) 2015-07-16 2021-05-25 Illinois Tool Works Inc. Extractor with end-mounted positive pressure system
US11530826B2 (en) 2015-07-16 2022-12-20 Illinois Tool Works Inc. Extractor with segmented positive pressure airflow system

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CH402129A (de) * 1961-11-08 1965-11-15 Kraemer Gerd Phasenfolgerelais für Drehstrom-Elektromotoren
DE3412204A1 (de) * 1984-04-02 1985-10-10 Bals Elektrotechnik Gmbh & Co Kg, 5942 Kirchhundem Netzanschlussgeraet
US4802053A (en) * 1987-03-11 1989-01-31 Square D Company Control circuitry including phase failure relay

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CH402129A (de) * 1961-11-08 1965-11-15 Kraemer Gerd Phasenfolgerelais für Drehstrom-Elektromotoren
DE3412204A1 (de) * 1984-04-02 1985-10-10 Bals Elektrotechnik Gmbh & Co Kg, 5942 Kirchhundem Netzanschlussgeraet
US4802053A (en) * 1987-03-11 1989-01-31 Square D Company Control circuitry including phase failure relay

Cited By (22)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN101895095A (zh) * 2010-06-29 2010-11-24 河南省电力公司许昌供电公司 电动机缺相显示保护装置
US9623506B2 (en) 2011-02-01 2017-04-18 Illinois Tool Works Inc. Fume extractor for welding applications
US11141808B2 (en) 2011-02-01 2021-10-12 Illinois Tool Works Inc. Fume extractor for welding applications
US9821351B2 (en) 2011-11-11 2017-11-21 Illinois Tool Works Inc. Welding fume extractor
US9505042B2 (en) 2012-03-16 2016-11-29 Illinois Tool Works Inc. Airborne component extractor with improved power and pressure performance
US9468958B2 (en) 2012-03-16 2016-10-18 Illinois Tool Works Inc. Airborne component extractor with adjustable flow rates
US9498805B2 (en) 2012-03-16 2016-11-22 Illinois Tool Works Inc. Airborne component extractor with improved flow paths
US10603698B2 (en) 2012-03-16 2020-03-31 Illinois Tool Works Inc. Airborne component extractor hood
US9505041B2 (en) 2012-03-16 2016-11-29 Illinois Tool Works Inc. Optimized airborne component extractor
US9604266B2 (en) 2012-03-16 2017-03-28 Illinois Tool Works Inc. Airborne component extractor manifold
CN102664387B (zh) * 2012-05-16 2014-08-27 天水二一三电器有限公司 三相电动机相序保护方法
CN102664387A (zh) * 2012-05-16 2012-09-12 天水二一三电器有限公司 三相异步电动机相序保护器与保护方法
US11376642B2 (en) 2013-01-29 2022-07-05 Illinois Tool Works Inc. Fume evacuation system
US9839948B2 (en) 2013-01-29 2017-12-12 Illinois Tool Works Inc. Fume evacuation system
CN103117542A (zh) * 2013-02-01 2013-05-22 四川省电力公司内江电业局 风机相序保护电路
WO2014209503A1 (fr) * 2013-06-28 2014-12-31 Illinois Tool Works Inc. Extracteur de composants atmosphériques portables triphasé à commande de direction rotatoire
US10808953B2 (en) 2013-06-28 2020-10-20 Illinois Tool Works Inc. Airborne component extractor with baffled debris collection
US9272237B2 (en) 2013-06-28 2016-03-01 Illinois Tool Works Inc. Three-phase portable airborne component extractor with rotational direction control
CN103746334A (zh) * 2014-02-18 2014-04-23 常州江南电力环境工程有限公司 加热器电子保护装置
US10242317B2 (en) 2014-11-25 2019-03-26 Illinois Tool Works Inc. System for estimating the amount and content of fumes
US11014132B2 (en) 2015-07-16 2021-05-25 Illinois Tool Works Inc. Extractor with end-mounted positive pressure system
US11530826B2 (en) 2015-07-16 2022-12-20 Illinois Tool Works Inc. Extractor with segmented positive pressure airflow system

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